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

A resource-based, alkaline leaching solution technology, applied in the field of metallurgy and environmental protection, can solve the problems of unavoidable arsenic pollution, unmarketable, and arsenic-harmed products, and achieve the effects of broad market application prospects, low production costs, and simple operation

Active Publication Date: 2018-07-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 solutio

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the method for recycling arsenic in the arsenic-containing material alkali leaching dearsenic solution comprises the following steps:

[0020] Step 1. Stir and mix 2L of arsenic-containing material alkali leaching and arsenic removal solution (alkali leaching and arsenic removal solution of arsenic-containing material is the alkali leaching and arsenic removal solution of copper smelting dust, arsenic content of 50g / L, pH 11.5) and benzyl chloride , the reaction is completed, and the feed liquid is left still for 60 minutes for liquid / liquid separation to obtain the intermediate product sodium benzyl arsinate (the liquid below) and the by-product benzyl alcohol (the liquid above), which is used as a chemical raw material; wherein benzyl chloride The amount added is 1.0 times of the theoretical amount of benzyl chloride consumed by arsenic in the alkaline leaching solution for arsenic-containing materials, the reaction temperature is 70°C, the ...

Embodiment 2

[0024] Such as figure 1 As shown, the method for recycling arsenic in the arsenic-containing material alkali leaching dearsenic solution comprises the following steps:

[0025] Step 1. Stir and mix 2L of arsenic-containing material alkaline leaching and arsenic-removing solution (alkaline leaching and arsenic-removing solution of arsenic-containing material is the alkaline leaching and arsenic-removing solution of lead smelting fumes, arsenic content is 10g / L, pH is 11) and benzyl chloride , the reaction is completed, and the feed liquid is left still for 30 minutes for liquid / liquid separation to obtain the intermediate product sodium benzyl arsinate (the liquid below) and the by-product benzyl alcohol (the liquid above), which is used as a chemical raw material; wherein benzyl chloride The amount added is 0.8 times the theoretical amount of benzyl chloride consumed by arsenic in the alkaline leaching solution for arsenic-containing materials, the reaction temperature is 60°C...

Embodiment 3

[0029] Such as figure 1 As shown, the method for recycling arsenic in the arsenic-containing material alkali leaching dearsenic solution comprises the following steps:

[0030] Step 1. Stir and mix 2L of arsenic-containing material alkali leaching and arsenic removal solution (alkali leaching and arsenic removal solution of arsenic-containing material is an alkali leaching and arsenic removal solution of tin smelting dust, arsenic content of 150g / L, pH 8) and benzyl chloride , the reaction is complete, and the feed liquid is left still for 90 minutes for liquid / liquid separation to obtain the intermediate product sodium benzyl arsinate (the liquid below) and the by-product benzyl alcohol (the liquid above), which is used as a chemical raw material; wherein benzyl chloride The amount added is 1.4 times the theoretical amount of benzyl chloride consumed by arsenic in the alkaline leaching solution for arsenic-containing materials, the reaction temperature is 90°C, the time is 2 ...

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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. ...

Claims

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Application Information

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IPC IPC(8): C07F9/74
Inventor 张玉慧金炳界王成彦
Owner KUNMING UNIV OF SCI & TECH
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