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Ahmadi R.,Iran Mineral Processing Research Center | Hashemzadehfini M.,Iran Mineral Processing Research Center | Amiri Parian M.,Lulea University of Technology
Advanced Powder Technology | Year: 2013

Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the rod-mill work index based on the conventional Bond work index. The grinding experiments were carried out on four typical samples of iron, copper, manganese and lead-zinc ore with three test-sieves in specified time periods and aimed to shortening the procedure. Furthermore, the grinding kinetics and mass balance equations were applied to model the standard Bond rod-mill work index. For comparing the standard Bond rod-mill work index and the new modeled method, work index (Wi) and produced fine particles in a cycle (Gi) for the four samples determined. The performed paired Student's t-test results indicated that the Standard Deviation for Gi and Wi obtained by the shortened method are respectively 0.50 and 0.58 in respect of traditional Bond method. © 2012 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder.


Shadloo M.,Jajarm Alumina Plant | Zarbayani M.,General Mechanics Company | Jorjani E.,Islamic Azad University at Tehran | Aram M.,Iran Mineral Processing Research Center
TMS Light Metals | Year: 2013

To increase the proportion of lower grade bauxite in the utilized feed and also possibility of increasing A/S ratio in the plant feed (4.66), some investigations on improving A/S ratio of Elburz Bauxite, especially lower grade ones, by gravitational method and flotation has been carried out. To evaluate heavy media separation, using heavy liquids with different specific gravities between 2.8-3.4 (g/cm3) on various size fractions of this bauxite with initial A/S ratio between 1.3-8.5, resulted that a special specific gravity can produce the concentrates (in sunk fractions) with the A/S ratios and productivities which can economically be used as plant feed. Pilot plant tests also carried out on a 25t sample of Bauxite with a A/S ratio of 2.0 and concentrate A/S and recovery in DMS tests were 3.30 and >40%, respectively.


Hashemzadehfini M.,Iran Mineral Processing Research Center | Ficeriova J.,Slovak Academy of Sciences | Abkhoshk E.,Islamic Azad University at Tehran | Shahraki B.K.,Iran Mineral Processing Research Center
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011

The use of mechanical activation to enhance gold recovery from a CuPbZn complex sulfide concentrate was investigated. The effects of milling time, ball size, sample to ball ratio and milling speed on thiosulfate leaching were studied. Under optimum conditions of milling time 1 h, ball size 20 mm, sample to ball ratio 1/15 and mill speed 600 r/min, nearly 78 of sample is amorphized, particle size decreases from d 100=30 μm to d 100=8 μm, specific surface area increases from 1.3 m 2/g to 4.6 m 2/g and gold recovery enhances from 17.4 in non-activated sample to 73.26 . © 2011 The Nonferrous Metals Society of China.


Baghban M.,Tehran Province Water and Wastewater Research Group | Baghahi S.M.,Tehran Province Water and Wastewater Research Group | Damercheli F.,Iran Mineral Processing Research Center | Miran Beigi A.A.,Research Institute of Petroleum Industry RIPI
Asian Journal of Chemistry | Year: 2014

Polycyclic aromatic hydrocarbons are a main group of organic compounds that their monitoring in water recourses is very important because of their side effects such as carcinogenic, genetic and systematic effects on human health. Sources of water pollution with polycyclic aromatic hydrocarbons are oil industries, oil leakage from storage tanks and oil transferring pipe lines, using of fossil fuels, industrial wastewater's disposal, burning and ash of wastes, etc . Due to ecological and environmental importance and also vast spreading of the pollutant resources in many districts of Iran including, monitoring of pollutants is necessary especially in Tehran province in order to ensure the health of water resources. In this study, 16 compounds of polycyclic aromatic hydrocarbons which are listed as potentially-carcinogen agents for human by the United States Environmental Protection Agency (EPA) were determined by gas chromatography-mass spectrometry. The instrument was calibrated in a selected ion monitoring mode (SIM mode) and it was equipped to a 30 m capillary column. In this research five water effluents including Jalalieh, Kan, Tehranpars 1, Tehranpars 2 and Sohanak water treatment plants with several water storage tanks (related to Tehran province water distribution) were studied. The samples were extracted from liquid phase and analyzed by injection to a GC-MS system (Agilent 6890N). The mass spectra indicate that the concentrations of these 16 polycyclic aromatic hydrocarbons compounds are lower than permitted limits of Iranian National Standard (standard number 1053 for drinking water), World Health Organization (WHO) and US.EPA recommendations. © 2014, Chemical Publishing Co. All rights reserved.


Shahsavari Sh.,Iran Mineral Processing Research Center | Ahmadi R.,Iran Mineral Processing Research Center | Akbari H.,Southern Illinois University Carbondale
Pb Zn 2010 - Lead-Zinc 2010 Symposium, Held in Conjunction with COM 2010 | Year: 2010

A lead-zinc oxide ore sample containing 18.59% Pb, 1.81% Zn, and 32.34% Fe taken from Koohbanan deposit, Koohbanan, Kerman-Iran was used for this experimental study. The studies concentrated on lead oxide mineral flotation. Various parameters such as the flotation rate constant, reagent dosages, the effect of using promoters on flotation rate, the effect of slimes on flotation efficiency, and concentrate cleaning time were investigated in relation to the metal contents of concentrate and flotation efficiency. Experiments were carried out with 500 g/t Na 2SiO 3 as slime dispersant, 9,500 g/t Na 2S, 600 g/t potassium amyl xanthate (KAX), and 20 g/t methyl isobutyl carbinol (MIBC) frother. A lead concentrate with 72.3% Pb was produced with 73% recovery as a result of four stage rougher flotation and 4.5 minutes cleaning. Using promoters such as AERO® 404 or AERO® 407 in combination with KAX had no positive effects on the outcomes. More than 90% of zinc remained in the flotation tailing during experiments.


Ghaffari A.,Iran Mineral Processing Research Center | Hayati M.,Tarbiat Modares University | Shekholeslami A.,Mineral Processing Research Group
Mineral Processing and Extractive Metallurgy Review | Year: 2012

The feed to mineral processing plants has fluctuations in assay, particle size, etc. These fluctuations have a strong influence on the efficiency of purifying lead and zinc processes. In simple circuits of mineral processing units, sensitivity analysis is applicable using analytical solutions, but this method is very difficult, time consuming and inaccurate for simulation of complex circuits. Nevertheless, Monte Carlo simulation method is an accepted tool for probability calculation and sensitivity analysis of complex circuits. In this paper, input data are collected from line 1 of flotation circuit of Bama lead and zinc processing plant (Isfahan, Iran) during 3 months of three 8-hour shifts per day. Distribution and probability density function of input data are determined using @Risk software in Excel. Then, the probability density function of output data (flow rates of lead concentrate, zinc concentrate, tailings, recovery of lead and zinc) are calculated using Monte Carlo simulation (with 100,000 iterations). Finally, the sensitivity of output parameters to input parameters is determined. © 2012 Taylor and Francis Group, LLC.


Rezaei E.,Iran Mineral Processing Research Center | Farahani A.,Iran Mineral Processing Research Center | Buekens A.,Zhejiang University | Chen T.,Zhejiang University | And 6 more authors.
Chemosphere | Year: 2013

In this project, emissions of Poly-Chlorinated Dibenzo-p-Dioxins and Dibenzo-Furans (PCDD/Fs) were investigated and estimated for selected Iranian mining and ore processing industries, such as integrated iron & steel plant, primary production of aluminium and copper metal, and the production of cement. As a first step of this study the annual emission of PCDD/Fs was estimated at 120gTEQannum-1 on the base of the UNEP standardised Toolkit for identification and quantification of dioxin and furan releases. Steel and cement were identified as major emission sources and earmarked for further scrutiny. For that reason, filter dust arising in these plants was sampled and analysed, as well as all raw materials employed. After extraction and clean-up according to standard methods, the resulting liquid samples were analysed and quantified by HRGC-HRMS. Complementary analyses using methods such as XRF, TGA/DTA were performed and the emission results statistically evaluated, in order to put PCDD/F emissions in perspective. It is concluded that the dioxins load of cement dust is unusually low, following the low carbon in raw materials, the use of natural gas as a fuel and the absence of waste incineration. Also the production of iron by direct reduction of ore is a low dioxins process; dioxin loads in dust are as usual - correlated with the presence of catalytic metals. Loss on ignition and chlorine are anti-correlated with the main earth elements and with sulphur oxides. © 2013 Elsevier Ltd.


PubMed | Iran Mineral Processing Research Center
Type: Journal Article | Journal: Chemosphere | Year: 2013

In this project, emissions of Poly-Chlorinated Dibenzo-p-Dioxins and Dibenzo-Furans (PCDD/Fs) were investigated and estimated for selected Iranian mining and ore processing industries, such as integrated iron & steel plant, primary production of aluminium and copper metal, and the production of cement. As a first step of this study the annual emission of PCDD/Fs was estimated at 120gTEQannum(-1) on the base of the UNEP standardised Toolkit for identification and quantification of dioxin and furan releases. Steel and cement were identified as major emission sources and earmarked for further scrutiny. For that reason, filter dust arising in these plants was sampled and analysed, as well as all raw materials employed. After extraction and clean-up according to standard methods, the resulting liquid samples were analysed and quantified by HRGC-HRMS. Complementary analyses using methods such as XRF, TGA/DTA were performed and the emission results statistically evaluated, in order to put PCDD/F emissions in perspective. It is concluded that the dioxins load of cement dust is unusually low, following the low carbon in raw materials, the use of natural gas as a fuel and the absence of waste incineration. Also the production of iron by direct reduction of ore is a low dioxins process; dioxin loads in dust are as usual - correlated with the presence of catalytic metals. Loss on ignition and chlorine are anti-correlated with the main earth elements and with sulphur oxides.

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