氨法浸出锌冶金渣尘提锌工艺及动力学研究

doi:10.11962/1006-4990.2019-0643

摘要/Abstract

摘要：

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。

关键词: 锌, 冶金渣尘, 氨法浸出

Abstract:

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

中图分类号:

TQ132.41

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.

Ma Aiyuan,Zheng Xuemei,Li Song. Study on leaching process and kinetics of zinc extraction from metallurgical slag and dust with ammonia[J]. Inorganic Chemicals Industry, 2020, 52(11): 69-74.

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w（Zn）/%	w（Fe）/%	w（C）/%	w（Pb）/%	w（S）/%	w（Si）/%
24.74	21.66	9.14	1.13	1.39	2.66
w（Al₂O₃） /%	w（Mg） /%	w（CaO） /%	w（In）/ （g·t^-1）	w（Cl）/ %	w（Bi）/ %
2.22	1.14	4.10	354	2.94	0.97

粒度/ μm	质量分数/%	w（Zn）/ %	粒度/ μm	质量分数/%	w（Zn）/ %
未分级原料	100.00	24.74	120~150	36.21	24.33
>380	6.54	23.24	109~120	11.18	24.74
250~380	8.60	24.20	96~109	17.94	24.14
180~250	8.17	24.70	<96	5.68	23.33
150~180	5.69	24.64

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