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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 292-300页

作者： Gai-rong Wang Hong-ying Yang Yuan-yuan Liu Lin-lin Tong Ali Auwalu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China CNMC Luanshya copper Mines Plc(CLM) Independence AvenueLuanshya City 90456Zambia

Mechanical activation(MA) of malachite was carried out by dry planetary grinding(DPG) and wet Isa grinding(WIG) methods. When the rotational speed was increased to 400 r/min in DPG, the specific surface area of malachite reached the maximum and the particle size reached the minimum of 0.7–100 μm. Agglomeration occurred between mineral particles when the rotational speed was increased to 580 r/min in ***, no agglomeration was observed among particles with sizes 0.4–3 μm in WIG. X-ray diffraction analysis showed that, at a 580 r/min rotational speed in DPG, the amorphization degree of malachite was 53.12%, whereas that in WIG was 71.40%, indicating that MA led to amorphization and distortion of crystal structures. In addition, in the Fourier transform infrared(FT-IR) spectra of activated malachite, the bands associated with –OH, CO_3^(2-)and metal lattice vibrations of Cu–O and Cu–OH were weakened, and a new H–O–H bending mode and peaks of gaseous CO_2 appeared, indicating that MA decreased the band energy, enhanced dihydroxylation, and increased the chemical reactivity of the ***, the leaching behavior of copper ore was greatly improved by MA.

关键词： malachite mechanical activation crystal structure copper ore Zambia

Investigating the first-order flotation kinetics models for Sarcheshmeh copper sulfide ore

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International Journal of Mining Science and Technology 2015年第5期25卷 849-854页

作者： Asghar Azizi Ahmad Hassanzadeh Behnam Fadaei Department of Mining Petroleum and GeophysicsUniversity of Shahrood Mineral Processing Department Faculty of MinesIstanbul Technical University

This study was performed in two phases of *** the first stage,four conventional first-order flotation kinetics models were fitted to the measured recoveries data and the best model were *** the second stage,influence of pH,solid concentration,water chemistry and the amount of collector dosage were investigated on kinetics parameters including flotation rate constant and ultimate *** results indicated that that perfectly mixed reactor model and Kelsall model gave the best and the weakest fit to the experimental data,*** was observed that flotation rate constant and ultimate recovery were strongly affected by chemical factors investigated especially water *** flotation rate constant decreased with increasing the solids content,while ultimate recovery increased to certain value and thereafter *** was also found that the most values of flotation rate constant and ultimate recovery obtained in dosage of collector are 30 and 40 g/t,respectively.

关键词： copper ore Flotation Kinetics model Rate constant Ultimate recovery

Empirical model for bio-extraction of copper from low grade ore using response surface methodology

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Transactions of Nonferrous Metals Society of China 2015年第12期25卷 4126-4143页

作者： M.YAGHOBI MOGHADDAM S.Z.SHAFAEI M.NOAPARAST F.DOULATI ARDEJANI H.ABDOLLAHI M.RANJBAR M.SCHAFFIE Z.MANAFI School of Mining College of Engineering University of Tehran Department of Mining Engineering Shahid Bahonar University of Kerman Department of Chemical Engineering Shahid Bahonar University of Kerman Hydrometallurgy Research Unit R&D Center Sarcheshmeh Copper Mine Complex

The copper extraction in shaking bioreactors was modeled and optimized using response surface methodology（RSM）. Influential parameters in the mesophilic bioleaching process of a low-grade copper ore including p H value, pulp density, and initial concentration of ferrous ions were comprehensively studied. The effect of leaching time on the response（copper extraction） at the 1st, 4th, 9th, 14 th and 22 nd days of treatment was modeled and examined. The central composite design methodology（CCD） was used as the design matrix to predict the optimal level of these parameters. Then, the model equation at the 22 nd day was optimized using the quadratic programming（QP） to maximize the total copper extraction within the studied experimental range. Under the optimal condition（initial p H value of 2.0, pulp density of 1.59%, and initial concentration of ferrous ions of 0 g/L）, the total copper extraction predicted by the model is 85.98% which is significantly close to that obtained from the experiment（84.57%）. The results show that RSM could be useful to predict the maximum copper extraction from a low-grade ore and investigate the effects of variables on the final response. Besides, a couple of statistically significant interactions are derived between p H value and pulp density as well as p H value and initial ferrous ion concentration which are precisely interpreted. However, there is no statistically significant interaction between the initial ferrous ion concentration and the pulp density. Additionally, the response at optimal levels of p H value and pulp density is found to be independent on the level of initial ferrous concentration.

关键词： modeling optimization bacterial leaching response surface methodology copper extraction copper ore

A new method of testing frother performance

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Transactions of Nonferrous Metals Society of China 2013年第9期23卷 2776-2780页

作者：谷艳玲冯其明欧乐明吕沛超中南大学资源加工与生物工程学院长沙410083

A new method of testing frother performance was proposed. Four parameters were tested： maximum foam volume, foam half-life, gas-liquid ratio and mean foam rise velocity. Among them the former two parameters indicate frother＇s foaming ability and foam stability respectively, and the latter two indicate water carrying ability and foam viscosity, respectively. The performance of four frothers in a two-phase （solution-air） system was tested and batch flotation tests on a copper ore were carried out. By analyzing frother performance in a two-phase system and comparing with the flotation results, correlation between them was found. Higher-copper concentrate grade was obtained by frothers with weak water carrying ability and low foam viscosity. And frothers with strong foaming ability and stable foam tend to obtain higher copper recovery.

关键词： flotation frother foam performance copper ore