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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第4期    总第284期    2018年4月

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文章编号:1672-7207(2018)04-0786-08
含锑难处理金矿选择性脱除锑
刘伟锋1, 2,孙百奇1,邓循博1,张杜超1,陈霖1,杨天足1

(1. 中南大学 冶金与环境学院,湖南 长沙,410083; 2. 河南豫光金铅集团有限责任公司,河南 济源,459000)

摘 要: 为了消除锑对难处理金矿提取金过程的不利影响,提出用硫化钠浸出方法预先从含锑难处理金矿中选择性脱除锑,考察各因素对锑浸出率的影响,查明最优浸出条件下金和砷的浸出率。研究结果表明:硫化钠过量系数、氢氧化钠质量浓度、温度、液固比和洗水比等因素的增加均有利于提高锑的浸出率,但是延长反应时间和增大搅拌速度会使锑浸出率略降低,增大洗水比至4.0可以将浸出渣中锑质量分数降低至0.04%。含锑难处理金矿硫化钠浸出在最优条件下,锑的浸出率可以达到96.64%,金和砷的浸出率分别为1.44%和0.41%。浸出液静置后析出的黑色沉淀为Na2FeS2,S和FeS2的混合物,说明会有少量FeS2矿物首先溶解然后从溶液中沉淀出来。

 

关键词: 难处理金矿;浸出;锑;硫化钠

Selective removal of antimony from antimonial refractory gold ores
LIU Weifeng1,2, SUN Baiqi1, DENG Xunbo1, ZHANG Duchao1, CHEN Lin1, YANG Tianzu1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. Henan Yuguang Gold and Lead Group Co., Ltd., Jiyuan 459000, China

Abstract:In order to avoid the negative influence of antimony on the cyanide process, the method of sodium sulfide leaching was proposed to selective remove antimony from refractory gold ores. The key factors influencing the leaching ratio of antimony were investigated, and these leaching ratios of gold and arsenic were also studied under the optimum condition. The results show that the excess coefficient of Na2S, NaOH mass concentration, temperature, liquid-to-solid ratio and washing water ratio benefit the leaching ratio of antimony. But the leaching ratio of antimony decreases with the increase of reaction time and enhancing stirring speed. Antimony mass fraction in the leach residue can be decreased to 0.04% by increasing washing water ratio to 4.0. Under the optimum condition, the leaching ratio of antimony reaches 96.64%, but those of gold and arsenic are only 1.44% and 0.41%, respectively. XRD analysis reveals that black mixture precipitated from the leach solution is composed of Na2FeS2, S and FeS2, indicating that less FeS2 first dissolves during leaching and then precipitates from the solution.

 

Key words: refractory gold ores; leach; antimony; sodium sulfide

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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