氨法浸出锌冶金渣尘提锌工艺及动力学研究
收稿日期: 2020-05-17
网络出版日期: 2020-12-01
基金资助
贵州省教育厅科技拔尖人才支持项目(黔教合KY字[2018]066);贵州省科技厅技术基金项目(黔科合基础[2019]1444);六盘水市科技计划项目(52020-2018-0304);六盘水市科技计划项目(52020-2019-05-08);六盘水市科技计划项目(52020-2019-05-09);六盘水师范学院科技创新团队(LPSSYKJTD201801);六盘水师范学院科技创新团队(LPSSYKJTD201905);六盘水师范学院重点学科建设项目(LPSSYZDPYXK201708);卓越工程师培养计划项目(LPSSYzyjypyjh201801)
Study on leaching process and kinetics of zinc extraction from metallurgical slag and dust with ammonia
Received date: 2020-05-17
Online published: 2020-12-01
锌冶金渣尘作为一种重要的锌二次资源,来源广、储量大、具有较高的综合回收利用价值。以NH3-CH3COONH4-H2O为浸出体系,考察粒度、反应时间、搅拌速度、液固比、总氨浓度、NH3与NH4+物质的量比和温度对锌浸出率的影响,结果表明：控制浸出温度为25 ℃、总氨浓度为5 mol/L、液固体积质量比为5 mL/g、n（NH3）/n（NH4+）=1:1、搅拌速度为300 r/min、浸出时间为60 min,在此条件下锌的浸出率可达84%。含锌冶金渣尘浸出动力学分析显示,浸出反应表观活化能为22.66 kJ/mol,锌浸出过程的浸出速率受固体膜层扩散及界面化学反应共同控制,并获得了浸出锌的动力学速率方程。
马爱元 , 郑雪梅 , 李松 . 氨法浸出锌冶金渣尘提锌工艺及动力学研究[J]. 无机盐工业, 2020 , 52(11) : 69 -74 . DOI: 10.11962/1006-4990.2019-0643
Zinc metallurgical slag and dust is an important secondary resource,it has the advantages of wide source,large re-serves and high comprehensive recycling value.The influence of particle size,reaction time,stirring speed,liquid-solid ratio,total ammonia concentration,amount-of-substance ratio of NH3 to NH4+ and temperature on the zinc leaching rate were investi-gated in NH3-CH3COONH4-H2O system.The results showed that the control leaching temperature of 25 ℃,total ammonia co-ncentration of 5 mol/L,liquid-solid volume-mass ratio of 5 mL/g,amount-of-substance ratio of n（NH3）/n（NH4+）=1:1,stirring speed of 300 r/min and leaching time for 60 min,then the zinc leaching rate reached 84%.The leaching kinetic analysis of metallurgical slag and dust indicated that the apparent activation energy of the reaction was 22.66 kJ/mol.The leaching rate of zinc was controlled by both solid film diffusion and interfacial chemical reaction,and the kinetic rate equation of zinc leaching was obtained.
Key words： zinc; metallurgical slag and dust; ammonia leaching
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