Selective sulphidation and flotation of nickel from a nickeliferous laterite ore
Selective sulphidation and flotation of nickel from a nickeliferous laterite ore
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DOI：
10.1016/j.mineng.2013.02.016
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发表时间：
2013-12-01
影响因子：
4.8
通讯作者：
Pickles, C. A.
中科院分区：
文献类型：
--
作者：
Harris, C. T.;Peacey, J. G.;Pickles, C. A.
在450 - 1100摄氏度的温度下和每吨矿石25-1000千克硫的硫添加量下研究了含镍红土矿石的硫化。实验表明，镍可以选择性地硫化形成镍铁硫化物。发现等级和硫化度两者在很大程度上取决于温度和硫添加，其中高于550 ° C的温度表现出最高的镍硫化度和等级。利用DTA/TGA和质谱仪进一步阐明了在硫存在下加热矿石时发生的相变的性质，发现在低温下，Fe-Ni-S相的性质为亚微米，并且加热到1050至1100 ℃之间的温度允许颗粒生长，这是由于与含有溶解氧的液体硫化物锍相的形成相关的硫化物迁移率增加。对60克样品进行的浮选研究表明，硫化物对浮选的响应最大品位高达6-7重量% Oickel正在实现。回收率约为50%的硫化物的基础上，它被确定为低镍品位是由于夹带的磁铁矿粉。(C)2013爱思唯尔有限公司保留所有权利。
The sulphidation of a nickeliferous lateritic ore was studied at temperatures between 450 and 1100 degrees C and for sulphur additions of 25-1000 kg of sulphur per tonne of ore. The experiments demonstrated that the nickel could be selectively sulphidized to form a nickel-iron sulphide. It was found that both the grade and the sulphidation degree largely depended upon the temperature and the sulphur additions, with temperatures above 550 degrees C exhibiting the highest nickel sulphidation degrees and grades. A DTA/TGA with mass spectrometer was used to further elucidate the nature of the phase transformations that occurred upon heating of the ore in the presence of sulphur.It was found that at low temperatures, the Fe-Ni-S phase was submicron in nature and heating to temperatures between 1050 and 1100 degrees C allowed for the growth of the particles, due to the increased sulphide mobility associated with the formation of a liquid sulphide matte phase, containing dissolved oxygen. Flotation studies conducted on 60 g samples showed that the sulphides responded to flotation with maximum grades of up to 6-7 wt.% oickel being achieved. Recoveries were approximately 50% on a sulphide basis and it was determined that the low nickel grades were due to the entrainment of magnetite fines. (C) 2013 Elsevier Ltd. All rights reserved.