A process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste residue

Abstract

The invention provides a process and system for electric-field synergy stabilizing treatment of multivalence arsenic-containing waste residue. The method comprises the following steps: step 1: adding an oxidizing agent into the arsenic-containing waste residue with a water content being 50-70% and stirring to enable arsenic to be subjected to oxidizing reaction; applying an electric field to the arsenic-containing waste residue while adding the oxidizing agent, wherein a cathode of the electric field is positioned in the middle of the arsenic-containing waste residue, and an anode is positioned around the arsenic-containing waste residue, such that anions in the anion are migrated and aggregated to the anode; step 2: removing the electric field after the oxidizing reaction of the arsenic in the arsenic-containing waste residue is finished, then adding a stabilizing agent into the arsenic-containing waste residue and stirring, such that the arsenic in the arsenic-containing waste residue is reacted to be stabilized, and therefore, an arsenic compound that exists stably is obtained, wherein in the steps 1 and 2, percolate of the arsenic-containing waste residue is always filtered and collected. The process for the electric-field synergy stabilizing treatment of multivalence arsenic-containing waste residue is low in cost and wide in processing range, and the processed arsenic-containing waste residue is small in capacity-increase ratio and has no secondary pollution.

Description

technical field [0001] The invention relates to the field of waste slag treatment, in particular to a process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste slag. Background technique [0002] The waste residue produced by the mining, dressing and smelting industry has a large output and high heavy metal leaching toxicity. With the gradual depletion of high-grade mineral resources, the new pollution source of arsenic-containing heavy metal solid waste discharged during the production process of the mining, dressing and smelting industry will be further highlighted. For example, tailings produced in the mining and beneficiation process, arsenic soot produced in the smelting process, arsenic-alkali slag, polluted acid slag, arsenic filter cake and other arsenic-containing waste residues will increase and pile up like mountains. If these arsenic-containing waste residues are not properly disposed of in a timely manner, ...

AI Technical Summary

Problems solved by technology

Objectively speaking, the method of direct high-temperature calcination has high operating cost and energy consumption, reaching hundreds of yuan per cubic meter, and the volatilization of arsenic in the high-temperature process of calcination makes it difficult to control the secondary pollution and thermal pollution of arsenic; although the method of cement solidification As a relatively mature method, it is widely used, but to reduce the highly toxic arsenic-containing waste residue to the standard, a large amount of cement needs to be added, and the volume after treatment is often increased by 2-5 times compared with the original one. Landfilling and stockpiling create a heavy burden

Images