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Skarin O.I.,RIVS Science and Production Association | Tikhonov N.O.,JV IVS
Eurasian Mining | Year: 2015

Optimization of ore pretreatment and selection of the appropriate equipment is one of the main areas of activity of RIVS Science and Production Association. For sizing ore pretreatment equipment, RIVS uses an integration of methods, including conventional commercial and semicommercial testing, and increasingly broadening laboratory testing of ore strength properties. Scale-up of the laboratory test data for the full-sized equipment is based upon mathematical modeling. This article describes the method offered by Barratt for sizing circuit power requirements for autogenous and semiautogenous milling. The method is widely used by RIVS in extended calculations at early design stages. The article is composed of sections successively informing on the existing techniques of sizing SAG mill power, Bond work indexes and their applicability to calculating autogenous/semiautogenous mills. Finally, the authors give a comparative analysis of the results obtained using the described method and in the joint commercial tests conducted by RIVS and SIBIR-Polymetals, Ural Mining and Metallurgical Company. Decision-making on selection of SAG mills increasingly uses the methods of sizing the milling power based on laboratory tests on grindability of minerals. This article considers one of such methods allowing determination of mill characteristics based on the Bond work indexes of crushing, rod milling and ball milling. The authors exemplify the described method application and compare the obtained estimates with the factual field test data. The article presents mathematical framework of a method used by RIVS to forecast energy input of various-type drum mills (ball mills, autogenous and semi-autogenous grinding mills). The basics of the described method were developed by S. Morrel, an Australian expert in mineral material milling, and have not been published previously in Russia. The RIVS experts have compared the new method and a few commonly used techniques and matched the forecasting values against the factual capacities of the on-site mills. As a consequence, it is concluded that the method described in this article yields the most accurate outcome due to the detailed accounting of ball charge motion. The Introduction gives a description of the proposed approximation of ball charge position in a rotating drum and its dependence on the mill velocity. In what follows, the mathematical apparatus used for the forecasting calculation of capacities of the drum shell and cone is presented. The mathematical procedure is based on the calculation of the overall potential and kinetic energy of the ball charge during its motion inside the rotating mill. The concluding section of the article offers empirical formulas to calculate idling and aggregate capacity of the mill main drive. © Skarin O. I., Tikhonov N. O., 2015. Source


Nikandrov I.S.,RIVS Science and Production Association | Bondarenko A.V.,RIVS Science and Production Association | Andreev D.S.,JV IVS
Eurasian Mining | Year: 2015

The paper describes the development of automatic X-ray fluorescent unit (XFU) intended for the express analysis of pulp slurries, as well as its software, methodical-mathematical and metrological support. It is emphasized that this XFU modification is difficult to implement but is best suitable for mineral processing plants, first of all, for operational control of flotation processes. In accordance with the concept of an automated analytical control accepted by RIVS, the designed automated analytical control system (AACS) is composed of XFU joined with an automated pulp sampling system (APSS) The authors review in brief the functions of the full-scale AACS and its constituents - XFU and APSS. The emphasis is made on the problems and features of XFU with the particular attention given to its analytical and instrumentation characteristics. The designed unit is compared with the best Russian and foreign analogues. The results of the analysis of powder and pulp samples of ore and ore dressing products are presented. It is shown that prime calibration of XFU is possible using model pulps - boric acid-based pellets. Finally, the authors conclude that the designed XFU meets the demands imposed on the express analytical control of ore and ore dressing precuts, and is usable as a prototype for various modifications. © Nikandrov I. S., Bondarenko A. V., Andreev D. S., 2015. Source


Zimin A.V.,RIVS Science and Production Association | Bondarenko A.V.,RIVS Science and Production Association | Trushin A.A.,JV IVS
Eurasian Mining | Year: 2015

RIVS Science and Production Association sees its mission in planning and turnkey construction of mineral processing plants, and the design of automation equipment and systems is the priority area of activity. This paper reviews the prime operating results of the company in the specified area. In the highlight is improvement of manufactured facilities belonging mainly in low-level automation, and design of new automation equipment and control systems. The authors exemplify implementation of the develop automation equipment and systems and various process machines. The emphasis is made on sampling and analytical control of process flows. The structure of the automated analytical pulp control system, including operational and inventory sampling, as well as X-ray fluorescent analysis and methodical-mathematical, metrological and program support is described. The discussion involves the concept and algorithm of automatic control of flotation, accounting for grades of ore under treatment. The authors point at the promising application of basic provisions of the statistic control theory based on Shewhart cards in mineral dressing process control. Capabilities of automated analytical control of recycled water being one of the most important factors that influence flotation efficiency are discussed. Finally, the authors draw a conclusion on continuing development of low-level and local automation equipment, considering the concept of unified control over mineral dressing process proposed by RIVS Science and Production Association. © Zimin A. V., Bondarenko A. V. Trushin A. A., 2015. Source


Sizykh A.S.,RIVS Science and Production Association | Poperechnikova O.Yu.,RIVS Science and Production Association | Nagaeva S.P.,JV IVS
Eurasian Mining | Year: 2015

Currently, the most popular way of increasing iron content of magnetite concentrates is re-grinding and wet weak-magnetic field separation. Though readily available, this technology yields minimum increment in iron content, features high energy input and results in enlarged specific surface of concentrates, which has an adverse influence on moisture content of cake in filtration and subsequent pelletizing. Flotation re-treatment of iron concentrates is technologically the most selective method of mineral processing, since it allows reduction of content of silica, phosphorus and other admixtures, and cardinally solves the problem on production of super concentrates. At the present time when rich iron ore reserves have been depleted and the world market of iron ore material faces high competition, quality standards for iron concentrates increasingly grow. Iron ore producers have to modernize process flow charts they use. Within the past ten years, RIVS Science and Production Association has accomplished a wide range of works toward improvement of iron ore processing technology and equipment (Russia, Ukraine, Philippines). The ample research has resulted in development of the technology for re-treatment of iron concentrates. The paper describes the results obtained in re-treatment of magnetite concentrates by the method of reverse cationic flotation using collecting agents based on amines. High selectivity of the agents eliminates the use of depressors. Flotation uses hard water with partial water rotation. The re-treatment enables production of iron concentrates with the iron content of 69.5% (at the recovery of 94.62%) and silica content of 1.75%. © Sizykh A. S., Poperechnikova O. Yu., Nagaeva S. P., 2015. Source


Shumskaya E.N.,RIVS Science and Production Association | Poperechnikova O.Yu.,RIVS Science and Production Association | Nagaeva S.P.,JV IVS
Eurasian Mining | Year: 2015

In magnetite ore mining and processing, oxidized ore makes 10-30% out of which 90% is lost with tailings. Processing of oxidized ferruginous quartzites is a promising and economic source for growth of concentrate production without increase in magnetite ore output. At present, under the order of Inguletsky Mining-and-Processing Integrated Works, Ukraine, RIVS has performed the research and pilot trial aimed at estimation of feasibility of oxidized quartzites processing. In view of the fine dissemination of Inguletsky oxidized quartzites (average size of hematite grains is 10-50 μm, quartz - 50-70 μm), the objective of the laboratory research was to determine the optimized processing method. As magnetic and gravity concentration of fine-disseminated ore is low-effective, the solely method of dressing is flotation. Hematite quartzites are currently not extracted but considered as a raw material for the Krivoi Rog Oxidized Ore Miningand- Processing Integrated Works and processing plants in Krivbass. As a result of the performed research, the technology of magnetite ore processing has been developed and pilot trialed. © Shumskaya E. N., Poperechnikova O. Yu., Nagaeva S. P., 2015. Source

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