某低品位红土矿石中镍钴的回收

B. Altansukh, Kazutoshi Haga, A. Shibayama
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引用次数: 3

摘要

研究了一种低品位红土矿石湿法冶金工艺,该工艺主要包括浸出和沉淀两个阶段。在第一阶段,分别通过化学浸出和压力浸出制备含镍和钴浓度较高的合适浸出液,然后进行分离。研究了硫酸浓度、浸出温度和浸出时间、高压釜内压对红土矿石中镍和钴的有效浸出的影响。在下一阶段,存在于液中的Ni和Co离子通过与氢硫化钠(pH 3.8)的硫化作用以硫化物的形式共沉淀。结果表明,该红土矿石含铁48.12%、铝1.8%、镍0.95%、Co 0.07%、Cr 0.29%、Mg 0.15%,主要矿物为滑石(mg3si4o10 (OH) 2)、针铁矿(FeOOH)和石英(sio2)。通过对化学浸出结果的比较,揭示了压力浸出低品位红土中镍、钴的高效。在溶液pH为3.8的条件下,通过添加硫化剂(NaHS)调节NaHS/(Co + Ni)比为3,将碳酸钙(caco3)中和后的纯化液中绝大部分Co(>97%)和Ni(55%)析出为混合硫化物。试验结果表明,采用压力浸出中和后再进行硫化处理,可实现低品位红土矿石中钴(Co)和镍(Ni)的高效回收。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Recovery of Nickel and Cobalt from a Low Grade Laterite Ore
This study focused on the development of hydrometallurgical process which allows the nickel (Ni) and cobalt (Co) recovery from a low grade laterite ore. The developed process consists of two main stages: leaching and precipitation. In the first stage, an appropriate leach liquor which contains a relatively high nickel and cobalt concentration is prepared by chemical leaching and pressure leaching followed by separation steps, respectively. The effects of sulfuric acid concentration, leaching temperature and time, internal pressure in an autoclave on the efficient leaching of Ni and Co from a laterite ore were presented. In the next stage, the Ni and Co ions present in the liquor are co-precipitated as sulfides by sulfuration with sodium hydrosulfide (pH 3.8). It was found that talc (Mg 3 Si 4 O 10 (OH) 2 ), goethite (FeOOH) and quartz (SiO 2 ) are main minerals of the laterite ore which contains 48.12% Fe, 1.8% Al, 0.95% Ni, 0.07% Co, 0.29% Cr and 0.15% Mg. The high efficiency of pressure leaching for Ni and Co from the low grade laterite ore was re vealed by comparing the chemical leaching results. The vast majority of Co (>97%) and Ni (55%) from the purified liquor resulting after neutralization with calcium carbonate (CaCO 3 ) was precipitat- ed as mixed-sulfides by adjusting the NaHS/(Co + Ni) ratio to 3 by the addition of sulfuration agent (NaHS) at the solution pH of 3.8. Based on the experimental results, the efficient recovery of cobalt (Co) and nickel (Ni) from the low grade laterite ore can be achieved using the pressure leaching and neutralization treatment followed by sulfuration.
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