从铁矾渣侧吹熔炼—烟化法烟灰中回收锌镉及其净化除杂  

Recovery and Purification of Zinc and Cadmium from Dust of Side Blowing-fuming Process for Treating Jarosites

作　　者：张佳桦 崔雅茹[1] 王国华 王正民 桂海平 李邓 李安鑫 ZHANG Jiahua;CUI Yaru;WANG Guohua;WANG Zhengmin;GUI Haiping;LI Deng;LI Anxin(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Hanzhong Zinc Industry Co.,Ltd.,Hanzhong 724204,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]汉中锌业有限责任公司,陕西汉中724204

出　　处：《湿法冶金》2024年第2期121-128,共8页Hydrometallurgy of China

基　　金：陕西省科技厅重点研发计划(2022GY-160)。

摘　　要：研究了采用酸性浸出—硫化除杂法从铁矾渣侧吹熔炼—烟化法产出的烟灰中回收锌、镉,并选择性除去浸出液中的铜,产物用以制备镉掺杂硫化锌;在热力学分析基础上,探明了硫酸体系下锌浸出率影响因素及其浸出动力学;通过正交试验明确了各参数对硫化钠选择性除杂的影响。结果表明:烟灰中锌主要以氧化锌形式存在,其浸出过程符合混合控制,表观活化能为73.70 kJ/mol;在最佳条件下,锌浸出率达98.99%。以Na_(2)S用量为理论添加量的3.2倍,控制体系pH=2.0,铜去除率可达95.97%,同时有效保留锌、镉,实现了铜与锌、镉的选择性分离。Zinc and cadmium were recovered by acid leaching—vulcanization impurity removal method from dust of slide blowing—fuming process for treating jarosites,and copper was selectively removed from the leaching solution by sulfide precipitation.Subsequently,the obtained purified solution will be used to prepare Cd-doped ZnS composites.Based on the thermodynamic analysis,the influencing factors and kinetics of zinc leaching rate in sulfuric acid system were investigated,and the influence of various parameters on sulfidation was elucidated through orthogonal tests.The results show that the zinc in dust mainly exists in the form of zinc oxide,the leaching reaction follows a mixed control model with a 73.70 kJ/mol activation energy.Zinc leaching rate can reach 98.99%under the optimum conditions.The copper removal rate can reach 95.97%under 3.2 theoretical times of Na_(2)S addition at pH of 2.0,with high retaining rate of Zn and Cd,achieving effectively selective separation of copper from zinc and cadmium.

关 键 词：烟灰 硫酸 浸出 铜 锌 镉 选择性分离 

分 类 号：TF813[冶金工程—有色金属冶金] TF803.21TF803.25