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过程工程学报 ›› 2015, Vol. 15 ›› Issue (4): 567-573.DOI: 10.12034/j.issn.1009-606X.215177

• 反应与分离 • 上一篇    下一篇

硫脲浸出烧结灰中银的动力学

常军 张佴栋 周俊文 张利波 彭金辉 任晓鹏   

  1. 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院
  • 收稿日期:2015-04-08 修回日期:2015-05-22 出版日期:2015-08-20 发布日期:2015-08-20
  • 通讯作者: 常军

Leaching Kinetics of Silver from Sintering Dust with Thiourea

CHANG Jun ZHANG Er-dong ZHOU Jun-wen ZHANG Li-bo PENG Jin-hui REN Xiao-peng   

  1. Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology
  • Received:2015-04-08 Revised:2015-05-22 Online:2015-08-20 Published:2015-08-20
  • Contact: CHANG Jun

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摘要： 以炼铁烧结灰水浸渣为原料，在物相分析的基础上，用硫脲选择性浸取其中的银，考察了物料粒径、浸出温度、硫脲浓度、浸出时间、搅拌速度对银浸出率的影响. 结果表明，在液固体积质量比8 mL/g、原料粒径96~80 mm、浸出温度50℃、硫脲浓度22 g/L、浸出时间120 min、搅拌速度400 r/min的条件下，银浸出率接近90%. 硫脲浸出水浸渣中的银符合收缩未反应核模型，反应表观活化能为29.7 kJ/mol，反应级数近似为1，动力学限制环节为通过固体产物层的内扩散控制.

关键词: 烧结灰, 银, 硫脲, 浸出, 动力学

Abstract: Using the sintering dust containing Ag from iron and steel metallurgical process as raw material, on the basis of phase analysis, an efficient leaching process of silver with thiourea from the dust was proposed. The effects of particle size, temperature, concentration of thiourea, leaching time and stirring speed on leaching rate of silver were examined. The results showed that silver leaching rate from water washed sintering dust could reach 90% under the conditions of ratio of liquid volume to solid mass 8 mL/g, 22 g/L thiourea and stirring speed at 400 r/min for 120 min. The leaching of silver conformed well to the shrinking core model with internal diffusion control. The apparent activation energy of silver reaction was calculated as 29.7 kJ/mol and the reaction order in acidic thiourea solution was approximately 1.

Key words: sintering dust, silver, thiourea, leaching, kinetics

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