Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage
作者： Liwei Yao , Xiaobo Min , Yong Ke , Yunyan Wang , Yanjie Liang
DOI: 10.3390/MIN9020130
关键词: Pollution 、 Heavy metals 、 Chemistry 、 Oxidation process 、 Arsenic 、 Smelting 、 Arsenic sulfide 、 Environmental chemistry
摘要: Non-ferrous metal smelting enterprises produce hundreds of thousands tons arsenic sulfide sludge (ASS) each year in China. Most the ASS are stored at companies without enough preventive measures. During storage and natural drying process, is easily oxidized, thereby causing secondary pollution increasing environmental risks. In this paper, experiments simulated were used to study release characteristics heavy metals. storage, concentrations As, Pb, Cd increased rapidly first then slowly. Although total amount released was largest, ratio order > Pb As. The effects different atmospheres conditions on metals explored. more H2SO4 sludge, higher concentration, addition an appropriate Ca(OH)2 beneficial for reducing Finally, SEM, XRD TG-DTG techniques carried out confirm that caused by oxidation process resulting from residual air.
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