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镍生物浸出法 ( Bio NIC)是由 Gencor公司作为与传统的从低品位硫化矿中熔炼回收镍工艺的竞争工艺而开发的。该法包括如下基本的单元操作 :( 1)生物浸出使金属硫化物氧化 ,并使可溶性金属进入溶液 ;( 2 )调整溶液的p H值除去铁 ;( 3 )固 /液分离 ;( 4 )产出硫化物沉淀 ,用离子交换或溶剂萃取富集和净化工艺溶液 ,以产生净化电解液 ;( 5 )净化后的电解液进行电积 ,生产纯阴极镍 ,或者用氢还原生产镍粉。Gencor公司在 BIOX法基础上开发了生物浸出技术 ,商业上已用它处理难处理的金矿。 1997年上半年中间示范厂在 Gencor工艺研究所投入运行 ,以证明 Bio NIC大规模处理西澳大利亚 Maggie Hays矿体的可能性。示范厂每天将生产大约 2 0 kg阴极镍。本文着重介绍开发的工艺流程和实验室以及中间工厂操作的结果。
The Nickel Bioleaching Method (Bio NIC) was developed by Gencor as a competitive process with the traditional smelting recovery nickel process from low grade sulphide ore. The method includes the following basic unit operations: (1) bioleaching to oxidize metal sulfides and bring the soluble metal into solution; (2) adjusting the pH of the solution to remove iron; (3) solid / liquid separation; (4) Producing sulphide precipitate, enriching and purifying the process solution by ion exchange or solvent extraction to produce a purged electrolyte; (5) purifying the electrolyzed electrolyte for electrowinning to produce pure nickel cathode, or hydrogen reduction to produce nickel powder. Gencor developed bioleaching technology based on the BIOX approach, which has been used commercially to treat refractory gold deposits. In the first half of 1997, the demonstration plant was commissioned at the Gencor Process Research Institute to demonstrate the potential of Bio NIC to deal extensively with the Maggie Hays ore body in Western Australia. The demonstration plant will produce about 20 kg of cathode nickel per day. This article highlights the results of developing process flows and labs and intermediate plant operations.