将硫化砷渣与 CaO 混合,分别用空气和双氧水对其氧化,考察硫化砷渣与 CaO 反应的钙化效果.XRD 分析证明 Ca3(AsO4)2·11H2O、CaO·As2O5·SO2、CaHAsO4·H2O 的生成.用少量双氧水仅对硫化砷颗粒表面进行氧化,表面被氧化的硫化砷颗粒与氧化钙生成砷酸钙层,这种表面改性的硫化砷渣用水泥固化的方法进行砷的稳定性处理,水泥固化体砷的浸出浓度最低可达 0.63 mg/L,低于 GB 18598-2019《危险废物填埋污染控制标准》中砷浸出浓度 1.2 mg/L的填埋限值.
Experimental Study on Surface Modification and Cement Solidification of Arsenic Sulfide Slag
Arsenic sulfide slag mixed with CaO was oxidized with air and hydrogen peroxide respectively,and the calcification effect of arsenic sulfide slag reaction with CaO was investigated.XRD analysis showed the formation of Ca3(AsO4)2·11H2O、CaO·As2O5·SO2、CaHAsO4·H2O.A small amount of hydrogen peroxide is used only to oxidize the surface of arsenic sulfide particles,and form a calcium arsenate layer by the oxidized surface of the arsenic sulfide particles with calcium oxide.This surface modified arsenic sulfide slag is treated with cement curing method for arsenic stability.The lowest leaching concentration of arsenic in cement curing body can reach 0.63 mg/L,which is lower than the landfill limit of 1.2 mg/L of arsenic leaching concentration in GB 18598-2019"Standard for Pollution Control on the Hazardous Waste Landfill".
万方数据
维普
