Stable curing method of arsenic sulfide waste slag

The invention discloses a stable curing method of arsenic sulfide waste slag. The method comprises the following steps: (1) heavy metal sludge is added in arsenic sulfide slag to be treated for stirring to obtain a slurry material; (2) calcium hydroxide powder is added in the slurry material obtained in the step (1) in the stirring state for continuous stirring until red substances in the slurry material are all disappeared; (3) yellow sand and cement are added in the material obtained by stirring in the step (2); and (4) the stirring material obtained in the step (3) is cooled to the normal temperature, is transferred to a forming mold for molding, is taken out from the mold, and is maintained at the normal temperature to obtain a curing body accordant with the landfill standard. The method uses the heavy metal sludge as an arsenic stabilizing agent for treating wastes by wastes; the sources of such materials as heavy metal sludge, lime, cement and yellow sand needed to treat the strong-acid arsenic sulfide waste slag are wide; other medicaments are not needed to be added; and compared with other methods, the method is lower in treatment cost.