Method for recycling arsenic in arsenic-containing material alkali leaching arsenic removal liquid

Abstract

The invention relates to a method for recycling arsenic in arsenic-containing material alkali leaching arsenic removal liquid and belongs to the technical fields of metallurgy and environmental protection. The method comprises the following steps: mixing arsenic-containing material alkali leaching arsenic removal liquid and benzyl chloride to perform arsenic reaction, allowing standing still for 30 minutes or longer after the reaction is completed, and performing liquid / liquid separation to obtain an intermediate product benzyl arsenate and a byproduct benzyl alcohol, wherein benzyl alcohol serves as a chemical raw material; adjusting the pH of the benzyl arsenate to 1 to 3 by using dilute sulfuric acid, separating out precipitate, performing liquid and solid separation to obtain a productbenzyl arsenic acid and filtrate, enabling the benzyl arsenic acid to be applied to mineral separation, neutralizing the filtrate and filtering to obtain neutralization residue and neutralization liquid, enabling the neutralization residue to be applied to manufacture a building material, and returning the neutralization liquid to leach the arsenic in the arsenic-containing material. According tothe method, the problems that by the conventional treatment technology of the arsenic-containing material alkali leaching arsenic removal liquid, arsenic pollution, arsenic harm and poor market are unavoidable are solved.

Description

technical field [0001] The invention relates to a method for recycling arsenic in an arsenic-containing material by alkaline leaching to remove arsenic, and belongs to the technical field of metallurgy and environmental protection. Background technique [0002] Arsenic is often associated with copper, lead, zinc, tin, tungsten, antimony, gold and other metal minerals. These arsenic are mined out along with the main minerals. More than 100,000 tons of arsenic entered the smelting system with the concentrate. During the smelting process, arsenic is mostly enriched in smelting intermediate products to form various arsenic-containing materials, which contain not only a large amount of arsenic, but also valuable metals such as copper, lead, zinc, antimony, bismuth, indium, etc. For the recovery of valuable metals, the disposal of arsenic must be considered. [0003] At present, the treatment of arsenic in arsenic-containing materials mainly includes fire method and wet method. ...

AI Technical Summary

Problems solved by technology

This method directly uses the arsenic-containing material alkali leaching and arsenic-removing solution as a raw material, which solves the problems that the existing treatment technology of the arsenic-containing material alkaline leaching and arsenic-removing solution is difficult to avoid the problems of arsenic pollution, arsenic hazard and unsalable products, and opens the way for arsenic in the arsenic-containing material and The extraction of valuable components of the material after arsenic removal creates mature conditions

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