Method for synthesizing calcium arsenate by oxygen pressure conversion

A technology for synthesizing calcium arsenate and calcium arsenate, which is applied in chemical instruments and methods, separation methods, arsenate/arsenite, etc., can solve the problems of low reagent consumption, fast reaction speed, and short time, etc. Achieve the effect of less reagent consumption, fast reaction speed and short reaction time

Inactive Publication Date: 2010-09-01
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for removing arsenic from the arsenic-containing fume and solution produced in the smelting process of non-ferrous metals. The process has no waste gas and waste water discharge, an

Method used

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  • Method for synthesizing calcium arsenate by oxygen pressure conversion
  • Method for synthesizing calcium arsenate by oxygen pressure conversion

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The soot contains 48.34% arsenic. Add 1Kg of arsenic-containing soot into 8Kg of water, add lime that is 1.5 times the theoretical requirement of arsenic, stir and slurry for 1 hour, then put the slurried material into a closed stirring reactor, heat to 150°C, and pass in oxygen until it is airtight The oxygen partial pressure in the container was 1.0 MPa, and the reaction was stirred for 2 hours. The reacted material is cooled and filtered to obtain stable calcium arsenate solid.

Embodiment 2

[0026] The soot contains 32.84% arsenic. Add 1Kg of arsenic-containing soot into 5Kg of water, add lime that is 2.0 times the theoretical requirement of arsenic, stir and slurry for 1 hour, then put the slurried material into a closed stirring reactor, heat to 180°C, and pass in oxygen until it is airtight The oxygen partial pressure in the container was 0.6 MPa, and the reaction was stirred for 3 hours. The reacted material is cooled and filtered to obtain stable calcium arsenate solid.

Embodiment 3

[0028] The soot contains 67.42% arsenic. Add 1Kg of arsenic-containing soot into 10Kg of water, add lime that is 1.1 times the theoretical requirement of arsenic, stir and slurry for 1 hour, then put the slurried material into a closed stirring reactor, heat to 120°C, and pass in oxygen until it is airtight The oxygen partial pressure in the container was 1.5 MPa, and the reaction was stirred for 2 hours. The reacted material is cooled and filtered to obtain stable calcium arsenate solid.

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Abstract

The invention relates to a method for synthesizing water insoluble calcium arsenate by oxidizing arsenic in arsenic-containing smoke dust or solution and belongs to the technical field of metallurgy. The method comprises the following steps of: (1) mixing and stirring the arsenic-containing smoke dust or solution with weighed lime to make slurry; and (2) adding the slurry material into a closed stirring reactor, introducing the air or oxygen into the closed container till the oxygen partial pressure in the closed container reach 0.6 to 1.5MPa, stirring the slurry material under a closed condition to perform an reaction to oxide trivalent arsenic in the slurry material into pentavalent arsenic and convert the pentavalent arsenic into water insoluble calcium arsenate, cooling the reaction solution, and filtering the reaction solution to obtain solid calcium arsenate. In the method, the arsenic in the arsenic-containing smoke dust or solution is oxidized into the pentavalent arsenic and the pentavalent arsenic is converted into the water insoluble calcium arsenate, neither waste gases nor waste water is produced in the process, the problem of opening a way for the arsenic in various kinds of arsenic-containing smoke dust is solved, and the environmental pollution caused by arsenic is eliminated.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy. The invention relates to a method for oxidizing arsenic in arsenic-containing dust or solution and synthesizing it into water-insoluble calcium arsenate. Background technique [0002] During the pyrometallurgy process of Sn, Cu, Pb and other non-ferrous metals, a large amount of arsenic-containing smoke is produced. When such materials are returned to smelting, it will cause arsenic to circulate and accumulate in a closed circuit in the smelting system, increasing the burden on the smelting system. Due to the high toxicity of arsenic oxide and its dissolution in water, it has caused serious pollution to the surrounding environment. [0003] At present, the methods for recovering or removing arsenic from arsenic-containing fumes mainly include: [0004] (1) Soot leaching to remove arsenic: This method leaches arsenic-containing soot with acid or alkali, leaches the valuable ...

Claims

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Application Information

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IPC IPC(8): C01G28/02B01D53/64
Inventor 王炜崔建明
Owner YUNNAN TIN GROUP HLDG
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