Method for preparing arsenic by direct reduction and roasting of arsenic-containing material

A material and roasting technology, which is applied in the field of preparing arsenic and arsenic-containing materials directly through reduction roasting, can solve the problems of difficult handling of arsenate materials, and achieve landfill and storage disposal, volume reduction, The effect of mild process conditions

Active Publication Date: 2017-05-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the difficult problem of existing arsenic-containing materials, especially arsenate materials, the purpose of the present invention is to provide a clean and efficient method for directly recovering high-purity arsenic from arsenic-containing materials, which realizes Reduction, Harmless and Recycling of Arsenic-Containing Waste Residue

Method used

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  • Method for preparing arsenic by direct reduction and roasting of arsenic-containing material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Using calcium arsenate obtained from a copper soot alkali leaching-lime precipitation in Yunnan as raw material, take 100Kg of raw material and mix it evenly with carbon powder, put it into a vacuum electric arc furnace (the amount of carbon powder added is 15% of the mass of raw material), turn on the vacuum pump, when the pressure Start to heat up at 1000Pa, raise the temperature to 700°C and keep the reducing environment for 3 hours, then stop heating to condense the arsenic vapor. After the reduction is completed, when the temperature drops to room temperature, close the vacuum furnace, and obtain metal arsenic from the condensation pipe section, and the purity is >95 %, the main component of the reduced slag sample is CaO.

Embodiment 2

[0035] Sodium arsenate crystals obtained by high-pressure alkali leaching-cooling crystallization of a tin electrolytic anode slime in Yunnan are used as raw materials. The crystals contain 30.13% As, 0.58% Pb, 0.42% Sb and 0.07% Sn. Take 100Kg of the sodium arsenate crystal and carbon powder and mix it evenly and put it into a vacuum electric arc furnace (the amount of carbon powder added is 20% of the mass of the raw material), turn on the vacuum pump, start to heat up when the pressure is 1Pa, and raise the temperature to 700 ° C and maintain a reducing environment for 4 After 1 hour, stop heating to condense the arsenic vapor. After the reduction, when the temperature drops to room temperature, close the vacuum furnace, and obtain metal arsenic from the condensation pipe section. The purity is >94% after testing, and the main component of the reduction slag sample is Na 2 CO 3 .

Embodiment 3

[0037] With the ferric arsenate obtained by high-pressure alkali leaching-iron salt precipitation of a certain copper electrolytic anode slime in Yunnan as raw material, 100Kg of raw material and carbon powder are mixed evenly and then put into a reduction electric furnace (the carbon powder addition is 20% of the raw material quality), and the temperature is raised to 900°C and maintain the reducing environment for 2 hours, then stop heating to condense the arsenic vapor. After the reduction, when the temperature drops to room temperature, close the reduction furnace, and obtain metal arsenic from the condensation pipe section. The purity is >96% after testing, and the main components of the reduced slag sample It is an oxide of Fe.

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Abstract

The invention discloses a method for preparing arsenic by direct reduction and roasting of an arsenic-containing material. The method comprises the following steps: taking arsenate as a raw material, uniformly mixing the arsenate material with a carbonaceous reducing agent to obtain a mixture, putting the mixture into an inert or reducing atmosphere, carrying out reduction and roasting under a negative pressure condition, and collecting roasting flue gas to obtain an arsenic product. According to the method, the arsenic-containing material which is commonly used in a metallurgical process and takes the arsenate as a main component is reduced into chemically stable elementary arsenic; the elementary arsenic is nontoxic, can be used as a raw material in the semiconductor and alloy industries, and has a certain market value; weight reduction, harmlessness and recycling of the toxic arsenic-containing material are realized in the reduction process and are the most reasonable development direction of arsenic; and therefore, the method has a large popularization value.

Description

technical field [0001] The invention relates to a method for preparing arsenic from arsenic-containing materials, in particular to a method for directly preparing arsenic from arsenic-containing materials through reduction roasting, and belongs to the technical field of nonferrous metal metallurgy. [0002] technical background [0003] The alkali slag, soot and anode slime produced in the non-ferrous smelting process often contain arsenic. When the wet process is used for treatment and purification, the arsenic removal process is essential. Leaching under alkaline conditions, followed by crystallization or precipitation separation is an effective and common method for arsenic removal, but this process produces a large amount of arsenate, which is toxic and chemically unstable, and is likely to be harmful to the environment and human health. posed a threat, it was therefore necessary to find an economical and environmentally friendly method for subsequent disposal of arsenate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/04
CPCC22B30/04
Inventor 刘维梁超焦芬杨康覃文庆蔡练兵
Owner CENT SOUTH UNIV
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