Arsenic removal from lead-zinc smelter ash by NaOH-H2O2 leaching
Arsenic removal from lead-zinc smelter ash by NaOH-H2O2 leaching
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DOI：
10.1016/j.seppur.2018.07.023
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发表时间：
2019-01-31
影响因子：
8.6
通讯作者：
Cai, Lianbing
中科院分区：
文献类型：
--
作者：
Gu, Kunhong;Li, Wenhua;Cai, Lianbing
高砷冶炼灰渣的安全处理对环境保护和资源综合利用都具有重要意义。采用NaOH-H2 O2浸取法对铅锌冶炼厂灰中的砷进行了脱除研究。在热力学计算的基础上，研究了不同操作参数对砷浸出率和浸出动力学的影响。结果表明，NaOH浓度和H2 O2加入量对砷的浸出率有显著影响。最佳工艺条件为：液固比10：1，NaOH浓度3 mol/L，H2 O2浓度2.4%，浸出时间2 h，浸出温度75 ℃。在此条件下，砷的浸出率高达98.17%。动力学研究表明，砷的浸出过程符合Avrami模型中的扩散控制型，表观活化能为16.03 kJ/mol。
The safe treatment of smelter ash with high arsenic is of great importance both for environmental protection and resource comprehensive utilization. In this study, arsenic removal from lead-zinc smelter ash by NaOH-H2O2 leaching was studied. The effects of different operating parameters on the leaching rate of arsenic and leaching kinetics were investigated based on thermodynamic calculation. The results indicate that NaOH concentration and H2O2 addition have significant effects on the leaching rate of arsenic. The optimum conditions were established as: liquid-solid ratio, 10:1; NaOH concentration, 3mol/L; H2O2 concentration, 2.4%; leaching time, 2 h; and leaching temperature, 75 degrees C. Under these conditions, the leaching rate of arsenic was as high as 98.17%. The kinetic study reveals that the arsenic leaching process is in accordance with the diffusion-controlled type in the Avrami model, and the apparent activation energy is 16.03 kJ/mol.