红土镍矿浸出液除杂制备氢氧化镍

doi:10.12034/j.issn.1009-606X.218309

过程工程学报 ›› 2019, Vol. 19 ›› Issue (4): 721-727.DOI: 10.12034/j.issn.1009-606X.218309

红土镍矿浸出液除杂制备氢氧化镍

聂超群^1,2，王旭滨²，李博^1,2*，魏永刚¹，王华²

1. 昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室，云南昆明 650093 2. 昆明理工大学冶金节能减排教育部工程研究中心，云南昆明 650000

收稿日期:2018-11-02 修回日期:2018-12-26 出版日期:2019-08-22 发布日期:2019-08-15
通讯作者: 李博 libokmust@163.com
基金资助:
低品位高含水硅镁型红土镍矿干燥与预还原机理及协同机制

Impurity removal from leaching solution of laterite nickel ore and preparation of nickel hydroxide

Chaoqun NIE^1,2, Xubin WANG², Bo LI^1,2*, Yonggang WEI¹, Hua WANG²

1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China 2. Engineering Research Center of Metallurgical Energy Conservation & Emission Reduction, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan 650000, China

Received:2018-11-02 Revised:2018-12-26 Online:2019-08-22 Published:2019-08-15
Contact: LI Bo libokmust@163.com

摘要/Abstract

摘要： 以低品位硅镁型红土镍矿硫酸浸出液为原料，用黄钠铁矾[Na2Fe6(SO4)4(OH)12]除铁、NaF除镁、中和沉镍，考察了不同因素的影响。结果表明，添加4 mL/L双氧水对浸出液氧化预处理、用Na2SO4为除铁钠源、控制溶液pH为1.6?2.2、反应时间1.5 h的条件下，铁去除率达92.1%，镍损失率为6.7%，滤渣主相为Na2Fe6(SO4)4(OH)12；除铁后滤液用NaF除去镁离子，最优条件为搅拌速率300 r/min、溶液pH=5.5?6.0及NaF 用量25 g/L，镁去除率达90.9%，镍损失率为6.8%；除杂后净化液用中和水解法提镍，在室温下添加8 g/L NaOH为沉镍剂，中和沉镍提取率达95.1%，得到纯度99.5%的Ni(OH)2产品，镍的综合回收率为82.70%。

关键词: 硅镁型红土镍矿, 浸出液, 除杂, 中和沉镍

Abstract: With sulphuric acid leaching solution of low-grade silicon?magnesium nickel laterite ore as raw material, iron was removed by jarosite precipitation, magnesium was removed using sodium fluoride, nickel was precipitated and neutralized from the leaching solution. The effects of different factors on the removal rates of iron and magnesium, and the loss rate and extraction rate of nickel were investigated. The results demonstrated that after oxidative pretreatment of the leaching solution by adding 4 mL/L hydrogen peroxide solution, the removal rate of iron reached 92.1%, the loss rate of nickel was 6.7%, and the main phase in the residue was jarosite [Na2Fe6(SO4)4(OH)12] with Na2SO4 as sodium source for iron removal, solution pH controlled within 1.6?2.2 and reaction time of 1.5 h. After iron removal, magnesium ions in the filtrate were removed using sodium fluoride. Under the best conditions of stirring speed 300 r/min, solution pH 5.5?6.0 and addition of sodium fluoride 25 g/L, the removal rate of magnesium reached 90.9%, and the loss rate of nickel was 6.8%. After the removal of impurities, nickel in the purified solution was extracted by neutralization and hydrolysis with NaOH as precipitating agent. At room temperature, addition of 8 g/L NaOH, extraction rate of neutralized and precipitated nickel was 95.1%. Nickel hydroxide products with purity of 99.5%, with an overall recovery rate of nickel of 82.70%. The removal of impurity elements in the leachate and the extraction of valuable metal nickel are realized, which provides technical support for the efficient utilization of the silico?magnesium type laterite nickel ore.

Key words: silica-magnesium type laterite nickel ore, leaching solution, miscellaneous, neutralizing nickel

聂超群王旭滨李博魏永刚王华. 红土镍矿浸出液除杂制备氢氧化镍[J]. 过程工程学报, 2019, 19(4): 721-727.

Chaoqun NIE Xubin WANG Bo LI Yonggang WEI Hua WANG. Impurity removal from leaching solution of laterite nickel ore and preparation of nickel hydroxide[J]. Chin. J. Process Eng., 2019, 19(4): 721-727.

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红土镍矿浸出液除杂制备氢氧化镍

Impurity removal from leaching solution of laterite nickel ore and preparation of nickel hydroxide

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