硫化砷渣稳定化/固化处理及其效果评价

Stabilization /solidification of arsenic sulfide residue and effect evaluation

以石灰、水泥作为固化材料,掺以氧化剂、PFS、PAM等稳定化药剂,确定了硫化砷渣稳定化/固化处理的最佳工艺条件。结果表明：砷渣固化体养护7 d抗压强度为2.32 MPa,28 d抗压强度为4.56 MPa;增容比（CR）为1.25～1.30,有效地控制了固化体的体积;固化体28 d浸出毒性低于《危险废物鉴别标准浸出毒性鉴别》和《危险废物填埋污染控制标准》规定的限值。经处理后,固化体完全满足危险废物转移、运输、贮存或安全填埋处置的要求。

Stabilization of arsenic sulfide slag with agents of oxidant, PFS and PAM, and solidifica- tion with lime and cements were studied in this paper, and optimal process parameters were deter- mined. The result showed that, with such treatment, the solidified body obtained a compressive strength of 2.32 MPa after 7 - day conservation, 4.56 MPa after 28 - day conservation, and the ca- pacity expansion ratio （ CR） was at 1.25 - 1.30, which meant the volume of the solidified body was effectively controlled. Its leaching toxicity after 28 - day conservation was lower than those limited by Identification Standards for Hazardous Wastes and Hazardous Waste Landfill Pollution Control Stand- ard. After treatment, solidified body can satisfy the requirements of transferring, transportation, stor- age and landfill as hazardous waste.