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acid equilibrium during bioleaching of alkaline low-grade sulfide copper ore

Rare Metals 2006年第6期25卷 680-686页

作者： WEN Jiankang RUAN Renman YAO Guocheng SONG Yongsheng General Research Institute for Nonferrous Metals Beijing 100088 China

This article reports the study on acid equilibrium during bioleaching of alkaline low-grade copper sulfide ore. Adding auxiliary agents 1# （sulfur） and 2# （pyrite） makes bacterial leaching of copper and acid production carried out simultaneously because the auxiliary agents can be oxidized by bacteria and the oxidation products involve acid. The acid required for dissolving alkaline gangue during bacterial leaching is produced, and acid equilibrium is reached during the ore bio-leaching. The recovery of copper reaches more than 95%.

关键词： bioleaching alkaline low-grade copper sulfide ore acid equilibrium process mineralogy auxiliary agent

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Bioleaching of a kind of alkaline mixed copper oxide and sulphide mineral

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Journal of Chongqing University 2010年第4期9卷 177-184页

作者：黄明清吴爱祥 School of Civil and Environment Engineering University of Science and Technology Beijing

We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis and experimental optimization, with initial pH value, pulp density, inoculation of bacteria and ferrous iron concentration selected as the influential factors. Polynomial regression shows that the four factors sequentially influence the copper recovery by 14.430%, 8.555%, 1.982% and 3.895%. acid equilibrium in the bioleaching system is mainly influenced by alkaline gangue content, chemical reactions and bacterial activity. A maximal portion of refractory copper extracted reaches 71.08%. The dynamic analysis of copper recovery indicates that bioleaching goes through a lag leaching phase, prime leaching phase and leaching stationary phase corresponding to the growth phases of bacteria. Compared with the predicted value of 80.87%, the confirmatory experiment observes a 78.21% copper recovery under the optimal conditions of pH of 1.5, pulp density of 5%, bacteria inoculation of 30% and initial ferrous iron concentration of 9 g L-1. Results suggest that bioleaching is technically feasible to improving total copper recovery.

关键词： alkaline mixed copper oxide and sulphide mineral bioleaching uniform design copper recovery acid equilibrium

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