Abstract Arsenic sulfide sludge (ASS) generated during the treatment of strongly acidic wastewater with sulfide precipitation method has long been a problem for the nonferrous smelting enterprises. In this study, stabilization of ASS from a lead and zinc smelter by hydrothermal treatment was investigated. The ASS was characterized with high contents of arsenic (46.9%) and sulfur (32.6%), and leaching concentration of arsenic was determined to be 702.0 mg/L. The parameters of the hydrothermal treatment were studied in detail. It was found that the leaching concentrations of As, Pb and Cd, dehydration ratio, density and morphology of ASS changed dramatically during the hydrothermal treatment. Comprehensive consideration of these changes, the optimal conditions were determined to be temperature of 200 °C, reaction time of 4 h, liquid-to-solid (L/S) ratio of 1:1 and the initial pH of 2. Under the optimal conditions, the leaching concentration of As for the treated ASS decreased to

中文翻译：

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水热处理稳定硫化砷污泥

摘要 硫化物沉淀法处理强酸性废水过程中产生的硫化砷污泥（ASS）长期以来一直是困扰有色冶炼企业的难题。在这项研究中，研究了通过水热处理稳定来自铅锌冶炼厂的 ASS。ASS 的特点是砷（46.9%）和硫（32.6%）含量高，砷的浸出浓度为 702.0 mg/L。详细研究了水热处理的参数。发现水热处理过程中As、Pb和Cd的浸出浓度、脱水率、密度和ASS的形貌发生了显着变化。综合考虑这些变化，确定最佳条件为温度200℃，反应时间4h，