Comparison on the leaching kinetics of chalcocite and pyrite with or without bacteria |
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Authors: | Renman Ruan E Zhou Xingyu Liu Biao Wu Guiying Zhou Jiankang Wen |
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Affiliation: | 1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;Zijin Mining Group Co. Ltd., Shanghang 364200, China 2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China 3. Zijin Mining Group Co. Ltd., Shanghang 364200, China;National Engineering Laboratory of Biohydrometallurgy, General Research Institute for Nonferrous Metals, Beijing 100088, China 4. National Engineering Laboratory of Biohydrometallurgy, General Research Institute for Nonferrous Metals, Beijing 100088, China |
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Abstract: | The acid leaching, ferric leaching, and bioleaching of chalcocite and pyrite minerals were conducted in two sets of 3L stirred
reactors. The dissolution rates of copper and iron were correlated with leaching conditions. In the acid leaching process,
the dissolution rate of chalcocite was around 40wt.% while that of pyrite was less than 4%. In the ferric leaching process
with high ferric concentration, only 10 wt.% of iron in pyrite was leached out at the same retention time though the copper
recovery over 60 wt.% in chalcocite. For the bioleaching process, the chalcocite leaching rate was highly increased, nearly
90 wt.% of copper was leached out, and the iron dissolution of pyrite exceeded 70 wt.%. For the two minerals, the bioleaching
shows the highest leaching rate compared with the acid leaching or ferric leaching. In uncontrolled bioleaching process, pyrite
could be dissolved effectively. The experimental data were fitted to the shrinking core and particle model. The results show
that in all the leaching tests, the chalcocite leaching was mainly controlled by diffusion, while for the pyrite leaching,
chemical reaction is the main rate-determining step. |
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Keywords: | chalcocite pyrite kinetic model bioleaching |
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