Method for transforming arsenic sulfide slag and curing and stabilizing resulting compound by means of microencapsulation

Abstract

The present disclosure provides a method for transforming an arsenic sulfide slag and curing and stabilizing the resulting compound by means of microencapsulation, comprising the following steps: (1) preparing arsenic trioxide from the arsenic sulfide slag as a raw material; (2) preparing 4-hydroxy-3-nitrophenylarsonic acid from the arsenic trioxide as a raw material; (3) preparing an iron-manganese dinuclear cluster metal arsenate compound having a porous structure; (4) subjecting the iron-manganese dinuclear cluster metal arsenate compound having a porous structure to surface coating with silicon; (5) synthesizing an Fe(0)/Al-SBA-15 mesoporous composite stabilizer by a hydrothermal reaction; and (6) subjecting the silicon coated iron-manganese dinuclear cluster metal arsenate compound to curing and stabilizing treatment by means of microencapsulation. The present disclosure involves transforming the arsenic sulfide slag into 4-hydroxy-3-nitrophenylarsonic acid and finally into a metal arsenate compound having a porous structure, which has the characteristics of good stability and low toxicity in comparison to conventional arsenic compounds. Thus, the toxicity associated with arsenic compounds can be greatly reduced.

Dependencies are inferred from the claim text.