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| 1 | Kinetics of chemical leaching of chalcopyrite from low grade copper ore: behavior of different size fractions显示文摘The kinetics of the chemical leaching of copper from low grade ore in ferric sulfate media was investigated using the constrained least square optimization technique. The experiments were carried out for different particle sizes in both the reactor and column at constant oxidation-reduction potential (Eh), pH values, and temperature. The main copper mineral was chalcopyrite. About 40% of Cu recovery is obtained after 7 d of reactor leaching at 85℃ using -0.5 mm size fraction, while the same recovery is obtained at 75℃ after 24 d. Also, about 23% of Cu recovery is obtained after 60 d of column leaching for +4--8 mm size fraction whereas the Cu recovery is as low as about 15% for +8--12.7 and +12.7--25 mm size fractions. A 4-stage model for chalcopyrite dissolution was used to explain the observed dissolution behaviors. The results show that thick over-layers of sulphur components cause the parabolic behavior of chalcopyrite dissolution and the precipitation of Fe3+ plays the main role in chalcopyrite passivation. In the case of coarse particles, transformation from one stage to another takes a longer time, thus only two stages including the initial reaction on fresh surfaces and S0 deposition are observed. | H. Naderi M. Abdollahy N. Mostoufi M.J. Koleini S.A. Shojaosadati Z. Manafi | 2011 | International Journal of Minerals,Metallurgy and Materials2011，18，6： | 6 |
| 2 | Estimation of diameter and surface area flux of bubbles based on operational gas dispersion parameters by using regression and ANFIS显示文摘Adaptive neuro fuzzy inference system (ANFIS) procedure and regression methods were used to predict the Sauter mean bubble (bubble diameter) and surface area flux of the bubble in a flotation process. The operational conditions of flotation, impeller peripheral speed, superficial gas velocity, and weight percent solids were used as inputs of methods. By using the mentioned operational conditions, the non linear regression results showed that Sauter mean, and surface area flux of the bubble are predictable variables, where the coefficients of determination (R 2 ) are 0.57 and 0.74, respectively. To increase the accuracy of prediction an ANFIS model with cluster radius of 0.4 was applied. ANFIS model was capable of estimating both Sauter mean, and surface area flux of the bubble, where in a testing stage, satisfactory correlations, R 2 = 0.78, and 0.86, were achieved for Sauter mean, and surface area flux of bubble, respectively. Results show that the proposed ANFIS model can accurately estimate outputs and be used in order to predict the parameters without having to conduct the new experiments in a laboratory. | B.Shahbazi B.Rezai S.Chehreh Chelgani S.M.Javad Koleini M.Noaparast | 2013 | International Journal of Mining Science and Technology2013，23，3： | 4 |
| 3 | Retinal ischemic and embolism:etiologies and outcomes based on a prospective study 显示文摘 | Babikian V Wijman CA Koleini B | 2001 | Cerebrovasc Dis2001，12，2： | 1 |
| 4 | The effect of hydrodynamic parameters on probability of bubble-particle collision and attachment显示文摘 | SHAHBAZI B REZAI B JAVAD KOLEINI S M | 2009 | Minerals Engineering2009，22，1： | 1 |
| 5 | Effect of calcium content on the microstructure, hardness and in-vitro corrosion behavior of biodegradable Mg-Ca binary alloy显示文摘 | Harandia S E Mirshahi M Koleini S | 2013 | Materials Research2013，16，1： | 1 |
| 6 | Bubble-particle collision and attachment probability on fine particles flotation显示文摘 | SHAHBAZI B REZAI B JAVAD KOLEINI S M | 2010 | Chemical Engineering and Processing:Process Intensification2010，49，6： | 1 |
| 7 | Extraction of indium from zinc plant residues显示文摘 | S.M. Javad Koleini Hossein Mehrpouya Kamal Saberyan Mahmoud Abdolahi | 2009 | Minerals Engineering2009，，1： | 1 |
| 8 | The effect of hydrodynamic parameters on probability of bubble-particle collision and attachment显示文摘 | Shahbazi B Rezai B Javad Koleini S M | 2009 | Minerals Engineering2009，，22： | 1 |
| 9 | Acidic sul-phate leaching of chalcopyrite concentrates in presence ofpyrite显示文摘 | Koleini S M J Aghazadeh V Sandstrm | 2011 | Minerals Engineering2011，，5： | 1 |
| 10 | Extraction of indium from zinc plant residues显示文摘 | Javad Koleini S M I-Iossein Mehrpouya Kamal Saberyan | 2010 | Minerals Engineering2010，，23： | 1 |
| 11 | Acidic sul- phate leaching of chalcopyrite concentrates in presence of pyrite显示文摘 | Koleini S M Aghazadeh V Sandstrom A | 2011 | Minerals Engineering2011，24，5： | 1 |
| 12 | Influence of hot rolling parameters on microstructure and biodegradability of Mg-ICa alloy in simulated body fluid 显示文摘 | KOLEINI S IDRIS M H JAFARI H | 2012 | Materials and Design2012，33，： | 1 |
| 13 | Acidic sulphate leaching of chalcopyrite concentrates in presence of pyrite 显示文摘 | KOLEINI S M J AGHAZADEH V SANDSTROM A | 2011 | Minerals Engineering2011，24，5： | 1 |
| 14 | The effect of hydrodynamic parameters on probability of probability of bubble-particle collsion and attachment 显示文摘 | Shahbazi B Rezai B Javvad Koleini S M | 2009 | Minerals Engineering2009，，12： | 1 |
| 15 | Retinal is chemia and embolism:etiologies and outcomes based on a prospective study显示文摘 | Babikian V Wijman CA Koleini B | 2001 | Cerebrovasc Dis2001，12，2： | 1 |
| 16 | Molecular dynamics simulation investigation of hexanoic acid adsorption onto calcite (1014) surface 显示文摘 | Ghatee M H Koleini M M Ayatollahi S | 2015 | Fluid Phase Equilibria2015，387，： | 1 |
| 17 | A new efficient method to characterize dynamic textures based on a twophase texture and dynamism analysis显示文摘 | KOLEINI M AHMADZADEH M R SADRI S | 2014 | Pattern recognition letters2014，45，2： | 1 |
| 18 | Acidic sulphate leaching of chalcopyrite concentrates in presence of pyrite 显示文摘 | Koleini S M J Aghazadeh V Sandstrom A | 2011 | Miner Eng2011，24，5： | 1 |
| 19 | Solvent extraction of rubidium from gold waste using conventional SX and new CFE methods显示文摘Solvent extraction(SX) of rubidium(Rb) from leaching filtrate of gold waste(GW) in Mouteh Processing Plant by 18-crown-6(18C6) was studied. High potential of new column flotoextraction(CFE) method in extraction of Rb from dilute solutions was also demonstrated. First, the factors affecting SX of Rb from a synthetic rubidium sulfate solution(containing 100 mg·L^(-1)Rb) were identified.0.05 mol·L^(-1)18C6 in kerosene, 0.02 mol·L^(-1) picric acid in aqueous phase, aqueous to organic(A/O) ratio of 1, p H7 and mixing time of 15 min are the optimum values for affective factors. The three-stage precipitation with sodium carbonate, p H adjustment with sulfuric acid and two-stage evaporation and crystallization were conducted to purify the leaching from impurities such as Fe, Al, Mn, Ca and especially competing cations of K and Na. Almost complete extraction of Rb and K from final filtrate containing 0.08 mol·L^(-1)picric acid was performed using 0.2 mol·L^(-1)18C6 in kerosene. The Rb and K strippings of 99.12 % and 9.93 %, respectively, are obtained with 2 mol·L^(-1)nitric acid with A/O ratio of 2. Finally, the performance comparison of the CFE and SX methods in similar conditionsshows increased extraction of K and Rb by 16 % and 5 %,respectively, using CFE method. | Mohammad Reza Tavakoli Mohammadi Seyed Mohammad Javad Koleini Sepideh Javanshir Hossein Abolghasemi Mahmoud Abdollahy | 2015 | Rare Metals2015，34，11： | 0 |
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