News Article | November 15, 2016
MONTRÉAL, QUÉBEC--(Marketwired - 15 nov. 2016) - Mason Graphite Inc. (ci-après « Mason Graphite » ou la « Société ») (TSX CROISSANCE:LLG) (OTCQX:MGPHF) a le plaisir de dévoiler l'avancement et le calendrier des travaux futurs de son étude détaillée sur la production à grande échelle de produits à valeur ajoutée à base de graphite, étude ayant été lancée en 2015. La Société est également heureuse d'annoncer l'obtention de contributions et subvention qui seront appliquées à ce programme. Les traitements requis pour la production de produits à valeur ajoutée, ou « 2ième transformation », comprennent la micronisation, la purification additionnelle, l'arrondissement et l'enrobage, et permettent d'obtenir des produits de graphite adaptés à une large gamme d'applications techniques (comprenant les balais électriques, les garnitures de frein, les plastiques et les lubrifiants), d'applications électrochimiques (comprenant les piles alcalines, les batteries Li-ion et les piles à combustible) ainsi que d'autres utilisations spécialisées. Mason Graphite travaille sur le développement des produits ainsi que sur les processus de fabrication avec le Conseil national de recherches du Canada (CNRC), COREM et Hatch. En ce qui concerne spécifiquement les matériaux d'anodes destinés aux batteries Li-ion, une phase d'analyse comparative, nécessaire pour déterminer les spécifications actuelles des produits utilisés, a été achevée en 2015. Suite à une nouvelle entente avec le CNRC, la Société a amorcé la phase de développement afin de concevoir, à partir de produits provenant de son gisement du Lac Guéret, un grade générique pour les utilisations traditionnelles des piles Li-ion ainsi qu'un grade spécifiquement destiné à l'industrie des véhicules électriques. Les travaux effectués sur ce dernier produit sont basés sur des informations, liées aux spécifications des clients, recueillies par la Société et le CNRC. Suite à la phase de développement des produits, une phase exhaustive et approfondie d'essais sera entreprise et simulera des environnements réels d'utilisation d'une batterie Li-ion de même que sa durée de vie équivalente. Ces essais seront effectués en parallèle à la fois au CNRC et dans les installations de clients. Au cours de cette période de tests, Mason Graphite entend également amener l'étude détaillée actuelle à un niveau de faisabilité. Ainsi, la Société procèdera à la conception et l'ingénierie de détails de la future usine, afin d'être prêt à la construction dès la fin de la phase d'essais ; cette nouvelle usine devrait être adjacente à l'usine de 1ère transformation. À cet effet, la Société établira un niveau de compréhension suffisant quant aux volumes requis par les clients afin de concevoir une capacité de production appropriée, et ce dès le début de la phase d'essais. Ces processus de développement et d'essais, nécessaires à l'homologation de ce type de matériaux, sont basés sur plus de 20 ans d'expérience dans le traitement et la commercialisation de différents types de graphite et d'autres produits de carbone pour les industries de batteries alcalines et Li-ion. Des essais d'équipements et des tests pour d'autres grades de produits à valeur ajoutée nécessitant uniquement une purification et/ou une micronisation sont en cours et sont intégrés dans le programme de travail des matériaux de batterie. Le budget prévu pour cette étude détaillée s'élève à 1 070 000 $. Afin de financer ces travaux, Mason Graphite est heureuse d'annoncer l'obtention des contributions et subvention suivantes : Benoît Gascon, président et chef de la direction de Mason Graphite, a déclaré : « Nous sommes très satisfaits des travaux réalisés jusqu'à présent avec nos partenaires et très encouragés par le niveau de collaboration des clients éventuels alors que nous poursuivons la conception des produits. Le marché des produits à valeur ajoutée dans son ensemble, et non pas uniquement celui des matériaux pour batteries, a le potentiel d'améliorer considérablement les rendements économiques d'un projet déjà très convaincant. » Le potentiel des produits à valeur ajoutée à base de graphite n'est pas inclus dans les résultats de l'étude de faisabilité définitive publiée en septembre 2015, ceux-ci étant basés uniquement sur la 1ère transformation. En 2015, le Gouvernement du Québec a lancé un plan d'action mobilisateur, structurant et responsable, visant à faire du Québec, qui dispose d'une abondance d'énergie propre à un coût concurrentiel, un chef de file dans les moyens de transport propulsés par l'électricité. Pour de plus amples informations à cet effet, visitez : www.transportselectriques.gouv.qc.ca. En s'appuyant sur cette initiative, Mason Graphite collabore depuis 2015 avec le CNRC et leurs experts en technologies de propulsion des véhicules et en matériaux pour batteries. À PROPOS DE MASON GRAPHITE ET DU PROJET DU LAC GUÉRET Mason Graphite est une compagnie minière canadienne dédiée au développement du gisement de graphite naturel du Lac Guéret dont elle détient 100 % des droits. La Société est dirigée par une équipe expérimentée possédant plus de 5 décennies d'expérience dans le graphite, notamment dans la production, la vente ainsi que la recherche et le développement. Pour plus d'information, visitez www.masongraphite.com. - Benoît Gascon, CPA, CA, Président et chef de la direction Ce communiqué de presse contient des «énoncés prospectifs» au sens de la législation canadienne en valeurs mobilières. Toute information contenue dans ce document qui n'est pas clairement de nature historique peut constituer un énoncé prospectif. En règle générale, ces énoncés prospectifs peuvent être identifiés par l'utilisation d'une terminologie prospective comme « planifie », « s'attend » ou « ne s'attend pas », « est prévu», « budget », « prévu », « estime », « prévisions », « a l'intention », « anticipe » ou « ne prévoit pas », « croit », ou des variantes de ces mots et expressions ou l'énoncé que certaines actions, certains événements ou résultats «peuvent », « pourraient », « seraient », « seront prises », « se produire » ou « être atteint ». L'information prospective est fondée sur des hypothèses que la direction de l'entreprise croit être raisonnables au moment où elles sont faites, comprenant mais sans s'y limiter, les activités continues d'exploration, les prix du graphite et autres métaux, les estimations des coûts en capital initial et de renouvellement, les estimations des coûts de main d'œuvre et des coûts d'opération, les estimations des ressources et réserves minières, les hypothèses sur les variations des taux de change, l'échéancier et les montants pour les explorations futures et les dépenses de développement, l'obtention des approbations réglementaires requises, la disponibilité du financement nécessaire pour le projet, la finalisation de l'étude d'impact en environnement et social et les autres hypothèses et facteurs énoncés aux présents textes. L'information prospective est assujettie à des risques connus et inconnus, des incertitudes et autres facteurs qui pourraient rendre les résultats réels, le niveau d'activité, les performances ou les réalisations de la Société sensiblement différents de ceux exprimés ou suggérés par de telles informations prospectives. Ces risques comprennent mais sans s'y limiter : la volatilité du cours des actions; les fluctuations des prix du graphite; l'origine et les coûts des sources d'énergie; les estimations des coûts en capital initial et de renouvellement; les estimations des coûts de main d'œuvre et des coûts d'opération; les marchés mondiaux et les conditions économiques générales; les risques associés à l'exploration, au développement et à l'exploitation de gisements miniers; les estimations des ressources et des réserves minières; les risques associés à des risques non assurables survenant en cours d'exploration, de développement et de production; les risques liés aux variations des taux de change; les risques environnementaux; la concurrence à laquelle fait face la Société à l'égard de l'embauche du personnel expérimenté; l'accès à une infrastructure adéquate pour soutenir les activités minières, de transformation, de développement et d'exploration; les risques associés à des changements à la réglementation de l'exploitation minière régissant la Société; la finalisation de l'étude d'impact en environnement et social; les risques liés aux retards réglementaires et d'obtention de permis; les risques liés aux conflits d'intérêts potentiels; la dépendance envers le personnel clé; les risques de financement, de capitalisation et de liquidité incluant les risques que le financement nécessaire pour continuer les activités d'exploration et de développement à Lac Guéret ne soit pas disponible ou disponible à des conditions acceptables; le risque de dilution potentielle par l'émission d'actions ordinaires; le risque de litiges. Bien que la Société ait tenté d'identifier les facteurs importants qui pourraient amener les résultats réels à différer sensiblement de ceux contenus dans les énoncés prospectifs, il peut y avoir d'autres facteurs qui fassent en sorte que les résultats ne soient pas ceux attendus, estimés ou prévus. Il ne peut y avoir aucune assurance que ces énoncés prospectifs se révéleront exacts, car les résultats réels et les événements futurs pourraient différer considérablement de ceux anticipés dans de tels énoncés prospectifs. Par conséquent, le lecteur ne devrait pas se fier indûment à l'information prospective. Les informations prospectives ne sont valables qu'à la date de ce communiqué de presse et la Société ne s'engage pas à mettre à jour ces informations prospectives, sauf conformément aux lois sur les valeurs mobilières applicables. La Bourse de croissance TSX et son fournisseur de services de règlementation (tel que ce terme est défini dans les politiques de la Bourse de croissance TSX) n'assument aucune responsabilité quant à la pertinence ou à l'exactitude du présent communiqué.
News Article | November 21, 2016
OTTAWA, ONTARIO--(Marketwired - Nov. 21, 2016) - Focus Graphite Inc. (TSX VENTURE:FMS)(OTCQX:FCSMF)(FRANKFURT:FKC) ("Focus" or the "Company") and partner SOQUEM Inc. ("SOQUEM") are pleased to announce the results from the 2014-2015 hydrometallurgical tests conducted on the Kwyjibo Poly-metallic Rare Earth Elements-Copper-Iron-Phosphate Project ("Kwyjibo" or the "Project"), located in the Côte-Nord administrative district of northeastern Québec. Focus Graphite President and CEO Gary Economo said: "While the economics of the Kwyjibo Project are still to be confirmed, the initial test results support Focus' long-term investment decision to continue developing Kwyjibo's potential." "More," he said, "we anticipate our hydrometallurgical test results may have a positive impact on our future development positioning within the framework of Quebec's Plan Nord northern development initiatives." "These results combined with the high grade, thickness, and continuity of the mineralization within the Josette Horizon illustrates that the Kwyjibo Project has the potential to generate positive economics and indeed, interest from within this global industry. We look forward to initiating the Preliminary Economic Assessment," Mr. Economo said. The latest hydrometallurgical leaching test program was conducted at Hazen Research in Colorado, USA. The program studied the use of three types of acid (H SO , HCl and HNO ) on various types of mineralization and subjected them to a beneficiation flowsheet that was previously developed at COREM, of Quebec City. Hazen research confirmed an average recovery of 90% of rare earth elements also obtained at COREM and Hazen also measured these high extraction rates under non-optimized leaching conditions. The Hazen program was conducted on two (2) composite samples that are representative of the two types of mineralization that are characteristic of the northeast portion of the Josette Horizon. The first composite sample of MM1 was taken from HQ-diameter drillcore that were split in half from two drill holes (10885-13-61A and 10885-13-69A). The representative MM1 sample is a hydrothermal massive iron formation, with variable amounts of veins containing REE-bearing phosphates and silicates as well as calc-silicate minerals. The second composite sample of Breccia Type ("BR1") mineralization is composed of HQ-diameter drillcore splits from three diamond drill holes (10885-13-73A, 10885-13-74A and 10885-13-69A). The representative BR1 sample is characterized by a stockwork of magnetite veins, REE-bearing phosphates and silicates, and calc-silicate minerals in a granitic host rock. Mineralogical studies performed at COREM in 2013 show that REE occur in phosphate (apatite and britholite) and silicate (allanite and kainosite) phases. Testwork results to date show that silicate concentrates produced from the composite samples leach well with nitric acid and hydrochloric acid. There is therefore no reason to separate the phosphates and silicates that both contain rare earth elements. Extraction using sulfuric acid gave poor results and therefore it was eliminated as a choice for acid leaching. "From the work performed, it was determined that the differences between the REE extractions for HCl and HNO were minor." (1) HYDROMETALLURGICAL WORK FOR KWYJIBO PROJECT, PREPARATION AND LEACHING OF RARE EARTH CONCENTRATES, project 12182, With the current price of these two types of acids, the use of HCl appears to be a more economical choice when considering operating costs. The following graphs show that the use of a 6 Molar ("6M") concentration of HCl at 90°C, achieved approximately 90% extraction from rare earth concentrate for all rare earth elements for the MM1 Combined and the BR1 mineralization types. To view 'Figure 1. REE Extractions for the MM1 Combined mineralization type in a 6M HCl leach at 90°C', please visit the following link: http://media3.marketwire.com/docs/focufig11121.pdf To view 'Figure 2. REE Extractions as a Function of Temperature for BR1 Combined with 6M HCl', please visit the following link: http://media3.marketwire.com/docs/focufig21121.pdf When considering all the mineral beneficiation processing steps previously developed by COREM (grinding, magnetic separation, flotation), followed by the leaching extraction developed by Hazen the non-optimized global recoveries of rare earth elements are described in the following table: The mineral processing flowsheet for the Kwyjibo project will therefore consist uniquely of minimal comminution steps followed by magnetic separation to remove the magnetite. Such a minimal beneficiation flowsheet will simplify operations. The current hydrometallurgical test program ongoing at Hazen research is focused on the leaching of non-magnetic products and the concentration/precipitation of dissolved rare earth elements. Hazen will continue to optimize the process flowsheet by working on the liberation size and grinding, as well as magnetic separation and leaching. Very encouraging results were obtained with both ore types, but since the in situ value of the MM1 mineralization type is higher, future efforts will aim to optimize the recovery of REE's from Kwjybo's MM1 mineralization type. That portion of the mineralization is located closer to surface and would potentially be less costly to mine. This combined with the fact that it is much easier to process than the BR1 mineralization type, the consensus was to proceed towards this objective. After completion of the current testwork program, SOQUEM and Focus Graphite intend to complete an initial Mineral Resource Estimate to be followed by a Preliminary Economic Assessment in 2017-18. On August 3, 2010, the Company announced the signing of an option agreement with SOQUEM Inc., to acquire a 50% interest in the Kwyjibo project. Under the terms of the agreement, Focus could acquire a 50% interest in the Kwyjibo project, by spending up to $3 million in exploration work on the project over a period of 5 years of which $1 million had to be spent during the first 2 years. SOQUEM is the operator for the exploration work carried out on the project to date and Focus has the option to become the operator, by paying $50,000 in cash or issuing a block of common shares valued at $50,000. As of the year ended September 30, 2016 Focus had spent $6.6M on the Kwyjibo project and has accordingly earned its 50% interest. Alain Dorval, P.Eng. of Norda Stelo Inc., is an independent Qualified Person as defined by National Instrument 43-101, for the purposes of the mineral processing and laboratory supervision as well as Eric Larochelle, P. Eng. of SMH Process Innovation, who is also an independent Qualified Person as defined by National Instrument 43-101 and both of them have reviewed the technical content of this news release. Mr. Marc-André Bernier, M.Sc, P.Geo (Québec and Ontario), a Director of the Company and a Qualified Person under National Instrument 43-101 - Standards of Disclosure for Mineral Projects, has reviewed and approved the technical content of this news release. SOQUEM, a subsidiary of Investissement Québec, is a leading player in mineral exploration in Québec. Its mission is to explore, discover and develop mining properties in Québec. SOQUEM has participated in more than 350 exploration projects and contributed to major discoveries of gold, diamonds, lithium and other minerals. The Kwyjibo polymetallic project, totalling 118 claims and covering 6,278 ha, is located 125 km northeast of the port city of Sept-Îles, in the Côte-Nord administrative district of Québec. The project is also located 25 km east of the Québec North Shore and Labrador railway line and is accessible by air from Sept-Îles. Kwyjibo is located in the Grenville Geological Province of north-eastern Québec, and hosts Meso-proterozoic poly-metallic (iron (Fe), copper (Cu), rare-earth elements (REE), gold (Au)) mineralization which is considered to be one of the best iron oxide copper-gold (IOCG) exploration targets in Québec. The mineralization has already been traced over a distance of at least 4 km. Focus Graphite Inc. is an advanced exploration and development mining company with an objective of producing graphite concentrate at its Lac Knife deposit located south west of Fermont, Québec. In a second stage, to meet Quebec stakeholder interests of transformation within the province and to add shareholder value, Focus is evaluating the feasibility of producing value added graphite products including battery-grade spherical graphite. The Lac Knife project hosts a Measured and Indicated Mineral Resource Estimate* of 9.58 million tonnes grading 14.77% graphitic carbon (Cg) (432,000 tonnes Measured @ 23.66% Cg and 9,144,000 tonnes Indicated @ 14.35% Cg) as natural flake graphite with an additional Inferred Mineral Resource Estimate* of 3.1 million tonnes grading 13.25% Cg. Focus' goal is to assume an industry leadership position by becoming a low-cost producer of technology-grade graphite concentrate. The Feasibility Study filed with SEDAR (www.sedar.com) on August 8, 2014 for the Lac Knife Project indicates the project is economically viable and has the potential to become a low cost graphite concentrate producer based on 7.86 million tonnes of Proven and Probable Mineral Reserves** grading 15.13% Cg included in the Mineral Resource (429,000 tonnes Proven @ 23.61% Cg and 7,428,000 tonnes Probable @ 14.64% Cg). On May 27, 2014 the Company announced the potential for high value added sales in the Li-ion battery sector following battery coin cell tests performed on Spherical Graphite ("SPG") produced from the Lac Knife graphite concentrate. Testing measured the performance metrics and confirmed Focus' capability to tailor lithium ion battery-anode-grade graphite and value added products to meet the most stringent customer specifications. On February 26, 2015, the Company announced the results from independent laboratory testing that indicated Coated Spherical Graphite ("CSPG") produced from Lac Knife concentrate outperformed synthetic graphite anodes for use in lithium-ion batteries. On November 25, 2015, the Company announced results from independent laboratory testing that reported "zero loss" in long-term battery anode cycle testing of high purity CSPG produced from Lac Knife concentrate. On March 31, 2016, the Company announced the introduction of a high conductivity graphite cathode material produced from expanded Lac Knife graphite and exhibiting twice the conductivity of cathodes versus standard grades of synthetic and natural flake graphite used in commercially available lithium-ion batteries. On August 8, 2016, the Company announced it has successfully purified fine flake graphite - sourced at its wholly owned Lac Knife, Québec deposit - from 95% to 99.99% purity using a proprietary energy efficient purification process. Attaining a 99.99% purity level from fine graphite flake is significant. Focus now has the technology to economically purify low value fine flake graphite or, "fines" to a high value material needed for the production of lithium-ion batteries. On August 17, 2016, the Company reported that the maiden core drilling program conducted at its Lac Tétépisca graphite project in 2014 intersected significant subsurface graphitic mineralisation along the trend of 1.5 km long MAG-EM anomaly including in hole LT-14-04 which intersected 103.9 m (true thickness) grading 10.25% Cg. Focus Graphite is a technology-oriented graphite mining development company with a vision for building long-term, sustainable shareholder value. Focus also holds a significant equity position in graphene applications developer Grafoid Inc. * Mineral resources are not mineral reserves and do not have demonstrated economic viability ** The Measured and Indicated Mineral Resources are inclusive of those Mineral Resources modified to produce the Mineral Reserve. The reference point for the Mineral Reserve Estimate is the mill feed. For more information about Focus Graphite, please visit www.focusgraphite.com. This News Release contains "forward-looking information" within the meaning of Canadian securities legislation. All information contained herein that is not clearly historical in nature may constitute forward-looking information. Generally, such forward-looking information can be identified by the use of forward-looking terminology such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", or "believes", or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved". Forward-looking information is subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of the Company to be materially different from those expressed or implied by such forward-looking information, including but not limited to: (i) volatile stock price; (ii) the general global markets and economic conditions; (iii) the possibility of write-downs and impairments; (iv) the risk associated with exploration, development and operations of mineral deposits; (v) the risk associated with establishing title to mineral properties and assets; (vi) the risks associated with entering into joint ventures; (vii) fluctuations in commodity prices; (viii) the risks associated with uninsurable risks arising during the course of exploration, development and production; (ix) competition faced by the Company in securing experienced personnel and financing; (x) access to adequate infrastructure to support mining, processing, development and exploration activities; (xi) the risks associated with changes in the mining regulatory regime governing the Company; (xii) the risks associated with the various environmental regulations the Company is subject to; (xiii) risks related to regulatory and permitting delays; (xiv) risks related to potential conflicts of interest; (xv) the reliance on key personnel; (xvi) liquidity risks; and (xvii) the risk of potential dilution through the issue of common shares. Forward-looking information is based on assumptions management believes to be reasonable at the time such statements are made, including but not limited to, continued exploration activities, no material adverse change in metal prices, exploration and development plans proceeding in accordance with plans and such plans achieving their stated expected outcomes, receipt of required regulatory approvals, and such other assumptions and factors as set out herein. Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such forward-looking information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such forward-looking information. Such forward-looking information has been provided for the purpose of assisting investors in understanding the Company's business, operations and exploration plans and may not be appropriate for other purposes. Accordingly, readers should not place undue reliance on forward-looking information. Forward-looking information is made as of the date of this News Release, and the Company does not undertake to update such forward-looking information except in accordance with applicable securities laws. Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the accuracy of this release.
Boucher D.,McGill University |
Deng Z.,McGill University |
Leadbeater T.,University of Birmingham |
Langlois R.,McGill University |
And 2 more authors.
Minerals Engineering | Year: 2014
Future improvements of gravity concentrators require an increased knowledge of the mechanics behind the separation, including the motion of the particles. This work details the investigation of particle motion through a spiral concentrator. The results of tracking the motion of individual particles using the positron emission particle tracking (PEPT) technique are described. Tracer particles of different sizes and density were tracked along the trough of a laboratory scale spiral. Multiple passes of one tracer through the spiral are combined to represent the bulk of flow of this particle type and size, with the position and time recorded to allow for the particle trajectory and speed to be determined. Finally, the use of PEPT will be shown to be a powerful method to visualise the behaviour of particles during the concentration process, providing data that will be used for the validation of new models of spiral concentrator performance. © 2014 Elsevier Ltd. All rights reserved.
Gong J.,University of Alberta |
Peng Y.,University of Queensland |
Bouajila A.,COREM |
Ourriban M.,COREM |
And 2 more authors.
International Journal of Mineral Processing | Year: 2010
Polyethylene oxide (PEO) was tested to flocculate and depress fine quartz particles in the batch flotation of artificial mixtures of chalcopyrite-quartz as well as a commercial Au-Cu sulphide ore sample. The aggregation/dispersion behaviors of quartz, chalcopyrite and their mixtures in the presence of PEO with and without potassium amyl xanthate (KAX) were studied by photometric dispersion analysis (PDA), scanning electron microscopy (SEM) and zeta potential measurements. Batch flotation results indicated that the addition of low dosages of PEO improved value mineral recovery and concentrate grade during the flotation of both the artificial mixtures of chalcopyrite-quartz and the Au-Cu sulphide ore sample. Aggregation/dispersion test results revealed that the PEO caused non-selective flocculation of quartz and chalcopyrite, forming large hetero-aggregates. However, the addition of KAX caused the chalcopyrite particles to break away from the hetero-aggregates, leading to separate homo-aggregates of quartz and chalcopyrite. The flotation of the fine chalcopyrite and the depression of the fine quartz were thus both improved. © 2010 Elsevier B.V. All rights reserved.
Sadeghi M.,Laval University |
Bazin C.,Laval University |
International Journal of Mineral Processing | Year: 2016
Spiral concentrators are used in the iron ore industry to separate heavy iron oxide carrier particles from the light silica ones. Losses of iron occur mainly in the fine (- 75 μm) and coarse (+ 600 μm) size fractions. This paper analyzes the radial distribution of iron oxide and silica particles in the reject of a 7 turn spiral. A splitter divides the reject flow into six (6) streams that can be sampled individually. Results show that coarse iron carrier particles settle mainly in the inner part of the spiral trough. Although fine iron particles are mostly concentrated in the outer part of the spiral trough, a significant proportion of these particles remain captive close to the concentrate ports. Coarse silica particles (+ 600 μm) are not concentrated in the innermost part of the spiral trough, while a significant concentration of silica particles in the size range of 75 to 212 μm is found close to the concentrate ports. This observation is coherent with the size of the silica particles that contaminate the spiral concentrate. © 2016 Elsevier B.V. All rights reserved.
Ni X.,University of Alberta |
Parrent M.,University of Alberta |
Cao M.,University of Alberta |
Huang L.,COREM |
And 2 more authors.
Minerals Engineering | Year: 2012
Anionic collectors (phosphonic acid and hydroxamic acid) and flotation depressants were tested in a modified small-scale flotation tube on high purity single minerals in order to find a suitable reagent combination for niobium oxide mineral flotation from its ores. High purity calcite and quartz were used to represent carbonate and silicate gangue minerals and pyrochlore was used to represent the niobium oxide mineral. Only hydroxamic acid could float pyrochlore at natural pH, with recoveries over 90%. However, it floated calcite as well. To separate the pyrochlore from the carbonate gangue, sodium metaphosphate was used. Single mineral and mineral mixture tests indicated that the calcite could be selectively depressed by the sodium metaphosphate. Bench-scale flotation tests were carried out on a carbonatite niobium ore sample, and they showed that the reagent combination, at less than 2 kg/t Aero 6493 (hydroxamic acid) and 1.0 kg/t sodium metaphosphate, could recover over 90% of niobium oxide from the ore feed at about 30% mass pull. The results indicated that the combination of hydroxamic acid and sodium metaphosphate is a possible reagent scheme for pyrochlore recovery from niobium oxide ores. © 2012 Elsevier Ltd. All rights reserved.
Bazin C.,Laval University |
Sadeghi M.,Laval University |
Minerals Engineering | Year: 2015
Spirals are gravity concentrators used for the valorization of coal and heavy minerals. Coarse hematite iron ores in Canada are usually concentrated by spirals. Spirals classify the particles according to their size and specific gravity. Several mathematical models were proposed to simulate the operation of spirals using a balance between the various forces acting on particles. However few models provide a method to account for wash water addition and the opening of concentrate ports that are two strategic variables for the operation of spiral classifiers. This paper proposes a model to incorporate these variables in a simulation scheme and validates the model with pilot plant data. © 2015 Elsevier Ltd.
Halt J.A.,Michigan Technological University |
Nitz M.C.,Michigan Technological University |
Kawatra S.K.,Michigan Technological University |
Mineral Processing and Extractive Metallurgy Review | Year: 2015
Iron ore pellets abrade during handling and produce dust. This study was conducted to determine what factors affect pellet dustiness, and whether dustiness can be related to the abrasion index. Factors studied included bed depth within a straight grate furnace; pellet chemistry; firing temperature; coke breeze addition; and tumble index. Abrasion indices for all pellet samples ranged from 1.9-5.0% (20 samples) and from 7.1-27.5% (5 samples). Pellets were dropped in an enclosed tower, which enabled the collection of airborne particles generated during pellet breakdown. The quantity of airborne particles generated by each pellet type was 10-100 mg/kg-drop, or 50-500 mg/kg over five drops through the tower. Pellet dustiness was predominantly affected by pellet chemistry and by pellet firing temperature. Results showed a nearly 21% increase in dustiness for every percent decrease in firing temperature-this was based on a typical firing temperature of 1280°C. Pellet dustiness was regressed to the pellet abrasion index (for AI < 5%), which yielded a correlation coefficient of 0.22. These results show that, although AI is one of the best indicators of fired pellet quality and can indicate high levels of dust, it could not explain the dustiness of good quality pellets.The second paper (Iron Ore Pellet Dustiness Part II) explains the relationship between AI and dust for good-quality pellets; and compares fines generation between pellets fired in Straight-Grate (Traveling Grate) and Grate-Kiln furnaces. © 2015 Taylor and Francis Group, LLC.
Corem | Date: 2014-11-03
A process for recovering a precious metal from ore includes adding process water containing thiocyanates to ore particles to obtain a pulp. The pulp having a basic pH is contacted with an oxidizing gas containing ozone; and the pulp is contacted with cyanide. Contacting the pulp with cyanide can include adding cyanide subsequently to contacting the pulp with the oxidizing gas containing ozone.
News Article | November 15, 2016
MONTREAL, QUEBEC--(Marketwired - Nov. 15, 2016) - Mason Graphite Inc. ("Mason Graphite" or the "Company") (TSX VENTURE:LLG) (OTCQX:MGPHF) is pleased to provide details on the progress, and upcoming work schedule, of its detailed study for large scale production of value-added graphite products, which was initiated in 2015. The Company is also pleased to announce obtaining contributions and grant, which will be applied to the related work program. Value-added processing, or "2nd Transformation", includes micronization, additional purification, spheronization and coating, resulting in graphite products suitable for a wide range of technical applications (including carbon brushes, brake linings, plastics and lubricants), electrochemical applications (including alkaline batteries, Li-ion batteries and fuel cells), as well as other specialized uses. Mason Graphite has been working on product development and manufacturing processes with the National Research Council of Canada (NRC), COREM and Hatch. Specifically for Li-ion anode materials, a Benchmarking Phase, necessary to establish the specifications of the products currently being used, was completed in 2015. Following a new agreement with NRC, the Company has begun the Development Phase in order to design, based on materials coming from its own Lac Guéret deposit, a generic grade for common Li-ion batteries and a grade specifically aimed at the electric vehicle industry. The work done on the latter product is based on information, related to customers' specifications, gathered by the Company and NRC. Following this Phase, an extensive and thorough Testing Phase will take place and simulate real Li-ion cell environments and equivalent lifetime of a battery. Such tests shall be conducted in parallel at both NRC and at customers' facilities. During that period of tests, Mason Graphite intends to bring the current detailed study to feasibility level, including the plant design and detailed engineering, in order to be construction-ready at the end of the Testing Phase; this plant is aimed to be adjacent to the 1st Transformation plant. As such, at the beginning of the Testing Period, the Company will obtain a sufficient level of understanding regarding the volumes required by those customers in order to design the appropriate production capacity. The processes described, necessary to the homologation of such materials, are based on more than 20 years of experience in processing and marketing different types of graphite and other carbon products to the alkaline and Li-ion battery industries. The equipment trials and product testing required for other grades of value-added products requiring only purification and/or micronization are ongoing and embedded in the work program of the battery materials. The budget allowed for this detailed study amounts to $1,070,000. In order to finance this work, Mason Graphite is pleased to announce that it has secured the following financial contributions and grant: Benoît Gascon, President and CEO of Mason Graphite, commented: "We are very pleased with the work done so far with our partners and very encouraged by the level of collaboration of eventual customers as we continue the product design. The value-added market as a whole, not only battery materials, has the potential to markedly improve the economics of an already very compelling project." The potential of the value-added graphite products is not included in the economics of the definitive feasibility study results published in September 2015 which were based solely on the 1st Transformation. In 2015, the Québec Government launched a responsible action plan providing structure and direction aimed at making Québec, with its abundant supply of clean and affordable energy, an electric transportation leader. More information at: www.transportselectriques.gouv.qc.ca/en/. Building on this initiative, Mason Graphite has been working since 2015 with NRC and their experts in vehicle propulsion technology and battery materials. About Mason Graphite and the Lac Guéret Project Mason Graphite is a Canadian mining and processing company focused on the development of its 100% owned Lac Guéret natural graphite deposit located in northeastern Québec. The Company is led by a highly experienced team that has over five decades of experience in graphite production, sales, and research and development. For more information, visit www.masongraphite.com. Mason Graphite Inc. On Behalf of the Board This press release contains "forward-looking information" within the meaning of Canadian securities legislation. All information contained herein that is not clearly historical in nature may constitute forward-looking information. Generally, such forward-looking information can be identified by the use of forward-looking terminology such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", or "believes", or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved". Forward-looking information is based on assumptions management believes to be reasonable at the time such statements are made, including but not limited to, continued exploration activities, graphite and other metals prices, the estimation of initial and sustaining capital requirements, the estimation of labour and operating costs, the estimation of mineral reserves and resources, the assumption with respect to currency fluctuations, the timing and amount of future exploration and development expenditures, receipt of required regulatory approvals, the availability of necessary financing for the project, the completion of the environment assessment process, permitting and such other assumptions and factors as set out herein. Forward-looking information is subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of the Company to be materially different from those expressed or implied by such forward-looking information, including but not limited to: volatile stock price; risks related to changes in graphite prices; sources and cost of power facilities; the estimation of initial and sustaining capital requirements; the estimation of labour and operating costs; the general global markets and economic conditions; the risk associated with exploration, development and operations of mineral deposits; the estimation of mineral reserves and resources; the risks associated with uninsurable risks arising during the course of exploration, development and production; risks associated with currency fluctuations; environmental risks; competition faced in securing experienced personnel; access to adequate infrastructure to support mining, processing, development and exploration activities; the risks associated with changes in the mining regulatory regime governing the Company; completion of the environmental assessment process; risks related to regulatory and permitting delays; risks related to potential conflicts of interest; the reliance on key personnel; financing, capitalization and liquidity risks including the risk that the financing necessary to fund continued exploration and development activities at Lac Guéret may not be available on satisfactory terms, or at all; the risk of potential dilution through the issue of common shares; the risk of litigation. Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such forward-looking information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such forward-looking information. Accordingly, readers should not place undue reliance on forward-looking information. Forward-looking information is made as of the date of this press release, and the Company does not undertake to update such forward-looking information except in accordance with applicable securities laws. Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.