Leaching behavior of metals from limonitic laterite ore by high pressure acid leaching

来源期刊：中国有色金属学报(英文版)2011年第1期

论文作者：郭学益 石文堂 李栋 田庆华

文章页码：191 - 195

关键词：高压酸浸；褐铁矿型红土矿；浸出行为；镍

Key words：high pressure acid leaching; limonitic laterite; leaching behavior; nickel

摘    要：以镍、钴的提取为目的，研究褐铁矿型镍红土矿高压酸浸过程中各金属元素的浸出行为，探讨硫酸加入量、浸出温度、浸出时间及液固比对各金属元素浸出率的影响。实验结果表明，在优化条件下Ni、Co、Mn和Mg的浸出率分别达到97%、96%、93%和95%以上，则Fe的浸出率小于1%。对高压浸出渣的分析表明，渣中的铁和硫主要分别以赤铁矿和明矾石的形式存在。高压浸出过程提供了一种从镍红土矿中提取镍和钴的简单有效的方法，同时产生具有利用价值的铁渣。

Abstract: The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt. The effects of sulfuric acid added, leaching temperature, leaching time and liquid/solid (L/S) ratio on metals extraction were examined. More than 97% Ni, 96% Co, 93% Mn, 95% Mg and less than 1% Fe are extracted under optimum conditions. Analysis of the high pressure acid leaching residue by chemical and XRD analysis indicates that the residual iron and sulfur are mainly present in phases of hematite and alunite, respectively. The high pressure leaching process provides a simple and efficient way for the high recovery of nickel and cobalt from laterite ore, leaving residue as a suitable iron resource.