Selective leaching of arsenic and antimony from a tetrahedrite rich complex sulphide concentrate using alkaline sulphide solution
Selective leaching of arsenic and antimony from a tetrahedrite rich complex sulphide concentrate using alkaline sulphide solution
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DOI：
10.1016/j.mineng.2010.08.018
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发表时间：
2010-12-01
影响因子：
4.8
通讯作者：
Sandstrom, Ake
中科院分区：
文献类型：
--
作者：
Awe, Samuel A.;Sandstrom, Ake
铜冶金中杂质元素的去除是当今遇到的主要问题之一，因为纯铜矿石储量逐渐枯竭，未开发的矿石资源往往含有相对大量的杂质元素，如锑、砷、汞和铋，需要消除。目前的工作旨在通过选择性溶解杂质来预处理富含四面体的复合硫化物精矿，从而使其升级为火法冶金处理。为此，研究了用碱性硫化物浸出剂从精矿中溶出锑和砷。结果表明，该浸出剂可选择性地有效溶解精矿中的杂质元素，且浸出回收率高。进一步研究了影响浸出剂浸出效率的因素。考虑的参数有硫化物离子和氢氧化物离子浓度、矿物粒度、反应温度和浸出时间。对浸出渣的分析表明，四面体中的铜含量已转化为硫化铜，平均化学式为Cu1.64S。该精矿经硫化物处理后，其品位和经济价值均有较大提高，适合作为冶炼原料。杂质已降低到熔炼炉中可容忍的低水平，从而减少了在对这种精矿进行火法冶金处理时遇到的处理和环境问题。(c) 2010 Elsevier Ltd.版权所有。
Removal of impurity elements in copper metallurgy is one of the major problems encountered today since pure copper ore reserves are becoming exhausted and the resources of unexploited ores often contain relatively high amounts of impurity elements like antimony, arsenic, mercury and bismuth, which need to be eliminated. The present work is aimed at pre-treating a tetrahedrite rich complex sulphide concentrate by selective dissolution of the impurities, therefore, upgrading it for pyrometallurgical processing. To accomplish this, dissolution of antimony and arsenic by an alkaline sulphide lixiviant from the concentrate were investigated. The lixiviant proved selective and effective to dissolve these impurity elements from the concentrate with good recoveries. Further investigations on the factors influencing the leaching efficiency of the lixiviant were studied. The parameters considered were sulphide ion and hydroxide ion concentrations, mineral particle size, reaction temperature and leaching time. Analysis of the leach residue indicates that copper content of tetrahedrite has transformed into copper sulphides with the average chemical formula Cu1.64S. The grade and economic value of the concentrate were improved greatly after sulphide treatment, and therefore, suitable as a feedstock for smelting. The impurities have been reduced to low levels which are tolerable in the smelting furnace and consequently reduce both the treatment and environmental problem encountered when such concentrate is processed pyrometallurgically. (c) 2010 Elsevier Ltd. All rights reserved.