硫脲浸出烧结灰中银的动力学  

Leaching Kinetics of Silver from Sintering Dust with Thiourea

作　　者：常军[1] 张佴栋 周俊文[1] 张利波[1] 彭金辉[1] 任晓鹏[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,微波能工程应用及装各技术国家地方联合工程实验室,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

出　　处：《过程工程学报》2015年第4期567-573,共7页The Chinese Journal of Process Engineering

基　　金：云南省科技领军人才培养计划资助项目(编号:2013HA002);国家级超硬材料先进制备技术国际联合研究中心资助项目(编号:2013B01038)

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 m L/g、原料粒径96?80?m、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 k J/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.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 rain. 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.

关 键 词：烧结灰 银 硫脲 浸出 动力学 

分 类 号：TF832[冶金工程—有色金属冶金]