Intensified bioleaching of low-grade molybdenite concentrate by ferrous sulfate and pyrite  

作　　者：Juan Yu Hong-Ying Yang Lin-Lin Tong Jun Zhu 

机构地区：[1]School of Metallurgy Engineering,Xi’an University of Architecture and Technology [2]School of Materials & Metallurgy,Northeastern University

出　　处：《Rare Metals》2015年第3期207-214,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51304151 and 51174062);the High-Tech Research and Development Program of China(No.2012AA061501)

摘　　要：Intensifying effects of ferrous sulfate and pyrite on bioleaching of low-grade molybdenite concentrate were studied in this paper. The experimental results show that the oxidation dissolution of molybdenite can be accelerated with the addition of either ferrous sulfate or pyrite in bi- oleaching medium. Pyrite has better enhancing effect than ferrous sulfate, and the highest molybdenum leaching rate in pyrite-added solutions is 20.85 %, increasing by 12.64 % compared with that in 9 K leaching system. Molybdenum leaching rate does not increase linearly with the increase of the addition of either ferrous sulfate or pyrite in each type solution. Great amounts of [NH4Fe3（SO4）2（OH）6] and [KFe3（SO4）2（OH）6] with different morphologies will be deposited on molybdenite ores when the additions of Fe from ferrous sulfate or pyrite exceed that from 9 K leaching system by 0.5 times, and these deposits hinder the oxidation dissolution of molybdenite to some extent.Intensifying effects of ferrous sulfate and pyrite on bioleaching of low-grade molybdenite concentrate were studied in this paper. The experimental results show that the oxidation dissolution of molybdenite can be accelerated with the addition of either ferrous sulfate or pyrite in bi- oleaching medium. Pyrite has better enhancing effect than ferrous sulfate, and the highest molybdenum leaching rate in pyrite-added solutions is 20.85 %, increasing by 12.64 % compared with that in 9 K leaching system. Molybdenum leaching rate does not increase linearly with the increase of the addition of either ferrous sulfate or pyrite in each type solution. Great amounts of [NH4Fe3（SO4）2（OH）6] and [KFe3（SO4）2（OH）6] with different morphologies will be deposited on molybdenite ores when the additions of Fe from ferrous sulfate or pyrite exceed that from 9 K leaching system by 0.5 times, and these deposits hinder the oxidation dissolution of molybdenite to some extent.

关 键 词：Low-grade molybdenite concentrate BIO-OXIDATION Intensified bioleaching Ferrous sulfate PYRITE 

分 类 号：TF841.2[冶金工程—有色金属冶金]