Arsenic alkali residue treatment method

Abstract

The invention provides an arsenic-alkali residue treatment method. The arsenic-alkali residue treatment method comprises the steps of mixing arsenic-alkali residues or an arsenic-alkali residue leaching solution with a neutralizer to obtain a mixed solution, then adding an oxidizing agent to carry out an oxidation reaction, and after the reaction is completed, carrying out filtering to obtain a solution A and filter residues A; adding the solution A into a microwave reactor, starting microwaves for heating, slowly adding an arsenic removal agent, carrying out an arsenic removal reaction under the condition that the pH value is 2-3, carrying out heat preservation and aging after the reaction is completed, and obtaining a solution B after the reaction is completed; and adding a neutralizer into the solution B to adjust the pH value, then adding the arsenic removal agent to react, and carrying out filtering after the reaction is completed to obtain a sulfate solution and filter residues B. According to the arsenic-alkali residue treatment method, the vulcanization precipitation procedure is omitted, and the treatment cost is saved; and the removal and stabilization rate of the arsenic in the acid wastewater and the arsenic-alkali residues reaches 99% or above through microwave induced crystallization, the arsenic stabilization time is short, the efficiency is high, and the comprehensive treatment cost is reduced by 50% or above compared with the comprehensive treatment cost of an existing treatment technology.

Description

technical field [0001] The invention belongs to the technical field of hazardous solid waste treatment, and in particular relates to a treatment method for arsenic-alkali slag. Background technique [0002] my country is very rich in antimony resources. In the industrial production of antimony smelting, a large amount of arsenic-alkali slag is often produced. The arsenic-alkali slag is the product of adding alkali to remove arsenic in the crude antimony refining process. The mass percentages of antimony and arsenic are 20%- 40% and 3%-9%, with a total alkalinity of 20%-30%. The arsenic in the arsenic-alkali slag exists in the form of soluble sodium arsenate, which is highly toxic. In addition, it is also rich in a large amount of residual alkali, which will seriously pollute the environment and endanger the survival and safety of human beings. [0003] At present, the methods for dealing with arsenic-alkali slag mainly include solidification landfill method, pyrolysis method...

AI Technical Summary

Problems solved by technology

[0004] At the same time, during pyrometallurgy of non-ferrous metals, the acidic sewage produced by leaching has complex components, mainly including toxic and harmful ions such as arsenic, mercury, cadmium, copper, zinc, and elements such as fluorine, chlorine, and sulfur. Into the acid sewage, causing the sulfuric acid content in the acid sewage to be as high as 100g / L

[0005] At present, the existing acid sewage treatment methods at home and abroad mainly include lime method, lime iron salt method, vulcanization method, pyrolusite method, ion exchange, electrodialysis, osmotic membrane treatment method and iron oxide coated sand treatment method, etc., but these The method is mainly aimed at the up-to-standard discharge of acidic sewage, which has problems such as unrecovered sulfuric acid and valuable metals, a large amount of hazardous waste, and the need for stabilization treatment of hazardous waste, or has disadvantages such as high treatment costs

Images