无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2013, Vol. 45 ›› Issue (8): 39-.

• 论文 • 上一篇    下一篇

改进硫脲法浸出含硫铁矿炼锌渣中银的工艺

张 玉1,苏 静1,龙云飞1,吕小艳2 ,文衍宣1   

  1. 1.广西大学化学化工学院,广西南宁 530004;2.广西大学教务处
  • 出版日期:2013-08-10 发布日期:2013-08-14

Leaching process of silver from zinc-smelting slag of sulfur-bearing pyrite by modified thiourea method

Zhang Yu1,Su Jing1,Long Yunfei1,Lü Xiaoyan2,Wen Yanxuan1   

  1. 1.School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China;
    2.Educational Administration Department,Guangxi University
  • Published:2013-08-10 Online:2013-08-14

摘要: 采用硫脲为络合剂、双氧水为氧化剂,研究了在硝酸介质中浸出含硫铁矿炼锌渣中银的工艺。考察了搅拌速率、反应时间、反应温度、硝酸初始浓度、双氧水浓度、硫脲浓度等因素对银浸出率的影响。结果表明,银的浸出率随着搅拌速率的增大和反应时间的延长先增大然后保持不变,随反应温度、硫脲浓度、双氧水浓度和硝酸初始浓度的增加先增大后减小。当搅拌速率为200 r/min、硝酸浓度为4.11 mol/L、双氧水浓度为0.82 mol/L、硫脲浓度为3.25 mol/L、反应温度为50 ℃、反应时间为1 h时,银浸出率可达82.0%。

关键词: 硫脲, 炼锌废渣,

Abstract: The leaching process of silver from zinc-smelting slag of sulfur-bearing pyrite with thiourea as chelating agent and H2O2 as oxidant in HNO3 was studied.The effects of stirring speed,reaction time,reaction temperature,HNO3 initial concentration,H2O2 concentration,and thiourea concentration etc. on the leaching efficiency of silver were investigated.Results showed that the leaching ratio of silver first increased and then kept constant with the increase of the stirring speed and the reaction time,while it first increased and then decreased with the increase of reaction temperature,HNO3 initial concentration, H2O2 concentration,and thiourea concentration.The optimal conditions for leaching of silver with thiourea were found as follows:the stirring speed was 200 r/min,HNO3 initial concentration was 4.11 mol/L,H2O2 concentration was 0.82 mol/L, thiourea concentration was 3.25 mol/L,reaction temperature was 50 ℃,and reaction time was 1.0 h.Under these conditions, the leaching ratio of silver was up to 82.0%.

Key words: thiourea, zinc-smelting slag, silver

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