Arsenic removal method of arsenic-containing waste residues

A waste slag and arsenic removal technology, applied in the direction of improving process efficiency, etc., can solve the problems that hinder the sustainable development of non-ferrous metal smelting enterprises, waste resources, occupy land, etc., and achieve good economic benefits, short reaction cycle and simple equipment.

Inactive Publication Date: 2017-05-17
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only occupies land, pollutes the environment, but also causes a huge waste of resources, which h...

Method used

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Examples

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Effect test

Embodiment 1

[0009] Example 1: Dry ferric chloride and arsenic-containing waste residue in a mass ratio of 1:100, roast at a temperature of 300°C, pass through protective gas argon, and roast for 50 minutes, and the volatilization rate of As reaches 89.45%. Under this condition, As and Fe elements can be well separated, thereby removing arsenic, and obtaining secondary smelting raw materials containing valuable metals.

Embodiment 2

[0010] Example 2: Dry ferric chloride and arsenic-containing waste residue in a mass ratio of 1:100, roast at 290°C, pass in protective gas argon, roast for 60 minutes, and the volatilization rate of As reaches 90.14%. Under this condition, As and Fe elements can be well separated, thereby removing arsenic, and obtaining secondary smelting raw materials containing valuable metals.

Embodiment 3

[0011] Example 3: Dry ferric chloride and arsenic-containing waste slag in a mass ratio of 0.1:100, roast at a temperature of 300°C, pass through protective gas argon, roast for 45 minutes, and the volatilization rate of As reaches 87.85%. Under this condition, As and Fe elements can be well separated, thereby removing arsenic, and obtaining secondary smelting raw materials containing valuable metals.

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PUM

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Abstract

The invention discloses a method for removing arsenic in arsenic-containing waste residues through a chloridizing volatilization method. The arsenic-containing waste residues and ferric chloride are mixed, the mass ratio of the arsenic-containing waste residues to the added ferric chloride is 100:(0.1-100):1, and chloridizing volatilization arsenic removal is carried out under the conditions that the reaction temperature ranges from 280 DEG C to 300 DEG C and the reaction time ranges from 40 min to 60 min. According to the method, the arsenic can be removed in the mode of arsenic trichloride relatively smaller in toxicity in a gas volatilization manner, the arsenic removal rate can reach about 90%, the recycling efficiency of other valuable metal elements in the arsenic-containing waste residues is improved, and the removal process is simple. The method can be widely applied to arsenic removal treatment of copper soot and various metallurgy arsenic-containing waste residues, provides a new thought for arsenic removal basic study and is a quite economical and effective arsenic removal method.

Description

technical field [0001] The invention relates to a technology for separating arsenic from valuable metals in waste slag in a nonferrous metal smelting process, in particular to a new method for removing arsenic from arsenic-containing waste slag. Background technique [0002] In recent years, with the continuous increase of my country's non-ferrous metal smelting capacity, the waste slag produced in the smelting process is constantly increasing, and its arsenic content varies from a few tenths of a percent to more than 20%. For example, tens of thousands of tons of arsenic enter the copper smelting system in China every year, and the arsenic in the copper slag will continue to circulate and enrich in the system, eventually making the requirements for arsenic content in copper smelting raw materials more and more stringent. At the same time, in the non-ferrous metal smelting process, the presence of arsenic not only poses a serious threat to the health of smelting operators an...

Claims

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Application Information

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IPC IPC(8): C22B1/08C22B7/04C22B30/04
CPCC22B1/08C22B7/04C22B30/04Y02P10/20
Inventor 姜平国邢振兴刘金生刘文杰
Owner JIANGXI UNIV OF SCI & TECH
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