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›› 2014, Vol. 14 ›› Issue (1): 56-63.

• 反应与分离 • Previous Articles     Next Articles

Research on Chemical Enrichment Process of Sulfur in Sulfur-containing Slag Produced in Zinc Hydrometallurgical Production

ZHANG Ying YU Guo-lin ZHENG Shi-li QIAO Shan WANG Xiao-hui JIANG Shao-feng WANG Shao-na   

  1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, CAS Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, CAS National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2013-09-18 Revised:2013-11-26 Online:2014-02-20 Published:2014-02-20
  • Contact: ZHANG Ying

锌湿法冶炼硫渣中硫磺化学富集工艺

张盈 余国林 郑诗礼 乔珊 王晓辉 蒋绍峰 张懿   

  1. 中国科学院过程工程研究所绿色过程与工程重点实验室 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所 北京科技大学冶金与生态工程学院 中国科学院过程工程研究所
  • 通讯作者: 张盈

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Abstract: Aimed at recovery of sulfur by hot filtration method from sulfur-containing slag which was a by-product from the enriched-oxygen direct leaching process of zinc concentrate, chemical enrichment process of elemental sulfur was carried out. Based on physico-chemical analysis of the sulfur-containing slag, it was known that the impurities affecting the grade of elemental sulfur were SiO2 and FeS2. Then, the technical scheme of de-silication by HF solution and decomposition of FeS2 by acidic ferric sulfate solution was proposed, and the relevant conditions were studied. The optimal conditions to remove silica were HF mass concentration 20%, temperature 55℃, time 3 h, and ratio of liquid to solid 4 mL/g, and the better conditions to decompose FeS2 were Fe3+ concentration 1.5 mol/L, sulphuric acid concentration 1.5 mol/L, 2 times of theoretical amount of ferric sulfate, temperature 98℃ and time 5 h. After treatment of the sulfur-containing slag by the two steps, the elemental sulfur in the slag was enhanced form 70% to 86%. The preliminary economic evaluation for this process showed that the proposed method had certain potential in industrial application.

Key words: sulfur-containing slag, sulfur, enrichment, silica, pyrite

摘要： 对锌精矿富氧直浸产生的硫渣中硫磺进行化学富集. 基于硫渣物理化学性质分析，得出影响硫磺品位的主要杂质是SiO2和FeS2，并进一步提出了HF溶液脱除SiO2, Fe2(SO4)3酸性溶液分解FeS2以提高硫磺品位的技术思路，研究了相应的技术条件. SiO2脱除的较佳条件为：HF溶液浓度20%(w)、温度55℃、时间3 h、液固比4 mL/g；FeS2分解的较佳条件为：Fe3+离子浓度1.5 mol/L、H2SO4浓度1.5 mol/L、Fe2(SO4)3用量为理论量2倍、温度98℃、时间5 h. 硫渣经两步处理后，硫磺含量可从70%提高至86.2%. 该工艺具有一定的工业应用价值.

关键词: 硫渣, 硫磺, 富集, SiO2, FeS2

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