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A method for fluidized arsenic removal of arsenic-containing smoke and dust

A technology of arsenic fume and fluidization, which is applied in the direction of improving process efficiency, etc., to achieve the effect of simple process, environmental friendliness and high efficiency of arsenic removal

Inactive Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that by providing a uniform temperature field and adopting a controllable reduction and volatilization process, it is possible to greatly improve the arsenic removal efficiency and selectivity of arsenic-containing fumes. Arsenic method

Method used

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  • A method for fluidized arsenic removal of arsenic-containing smoke and dust
  • A method for fluidized arsenic removal of arsenic-containing smoke and dust
  • A method for fluidized arsenic removal of arsenic-containing smoke and dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The main components of arsenic-containing smoke and dust are as follows: As 15.78%, Sb 64.23%, Pb 0.78%, Bi0.62%; carbon monoxide gas, of which CO content ≥ 99% by volume. Industrial nitrogen, where N 2 The volume percentage content is ≥99%.

[0036] After drying 1000g of the above-mentioned arsenic-containing dust at 100°C for 2 hours, it is fluidized by a mixed gas of carbon monoxide and industrial nitrogen (the volume ratio of carbon monoxide and industrial nitrogen is 0.05:100), and it is kept at 450°C for 10 minutes, and then the carbon monoxide is removed. Introduce, only use industrial nitrogen to maintain the fluidization of arsenic-containing fumes, and increase the temperature to 500°C, keep warm for 60 minutes, and obtain 784.6g of residue after volatilization, the main chemical components are As 0.43%, Sb 81.36%, Pb 0.87% in mass percentage , Bi0.58%, the arsenic removal rate reaches 97.84%; after the flue gas is cooled to collect arsenic, 206.5g of soot is...

Embodiment 2

[0038] The main components of a certain arsenic-containing smoke are: As 30.54%, Sb 24.32%, Pb 4.2%, Bi 4.1%, Cu 5.66%; hydrogen, of which H 2 The volume percentage content is ≥99%. Industrial argon, in which the content of Ar is ≥99% by volume.

[0039]After drying 1000g of the above-mentioned arsenic-containing dust at 80°C for 3 hours, it is fluidized by a mixed gas of hydrogen and industrial argon (the volume ratio of hydrogen and industrial argon is 0.5:100), and it is kept at 380°C for 25 minutes, and then canceled The introduction of hydrogen, the fluidization of arsenic-containing smoke and dust is only maintained by industrial argon, and the temperature is increased to 600 ° C, kept for 120 minutes, and 563.13 g of volatilized residue is obtained. The main chemical components are As 1.29% by mass percentage, Sb 42.33%, Pb 7.11%, Bi 6.78%, Cu 9.97%, the arsenic removal rate reaches 97.61%; after the flue gas is cooled to collect arsenic, 398.28g of soot is obtained, a...

Embodiment 3

[0041] The main components of a certain arsenic-containing smoke and dust are as follows: As 2.2%, Sb 2.4%, Pb 1.96%, Bi 3.71%, Cu 19.02%; gas, of which H 2 , CO, CH 4 , CO 2 , N 2 The content in volume percentage is 1.8%, 32.4%, 23.6%, 12.4%, 50.1%, respectively. Industrial nitrogen, where N 2 The volume percentage content is ≥99%.

[0042] After drying 1000g of the above-mentioned arsenic-containing dust at 120°C for 8 hours, make it fluidized by a mixed gas of coal gas and industrial nitrogen (the volume ratio of coal gas and industrial argon is 5:100), keep it warm at 480°C for 5 minutes, and then cancel the gas The arsenic-containing fume is kept fluidized only by industrial nitrogen, and the temperature is increased to 550°C, and kept for 90 minutes to obtain a residue after volatilization of 963.74g. The main chemical components are As 0.14% by mass percentage, Sb 2.44%, Pb 2.0 %, Bi 3.78%, Cu19.64%, the arsenic removal rate reached 93.94%; after the flue gas was c...

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Abstract

The invention relates to a method for removing arsenic from arsenic containing smoke under fluidization. The method comprises the following steps: firstly, drying the arsenic containing smoke, fluidizing the arsenic containing smoke by using a gas flow, controlling the proportion of protective gases to reducing gases in the gas flow, and reducing and volatilizing arsenic; and then directly volatilizing arsenic in the presence of the protective gases, collecting dust in smoke generated during volatilizing arsenic at a high temperature, and collecting arsenic at a low temperature to obtain arsenic trioxide, wherein the residue generated during volatilizing arsenic serves as a raw material for recovering other valuable metals. Because involatile arsenic pentoxide is completely converted into volatile arsenic trioxide, and the further reduction of arsenic trioxide is avoided, arsenic can be removed from the arsenic containing smoke efficiently. Residue and smoke generated from the treatment of arsenic containing smoke are used as a raw material for recovering valuable metals and an arsenic trioxide product respectively, and thus no secondary pollution is caused.

Description

technical field [0001] The invention relates to a pyrometallurgical process in the field of metallurgical pollution control, in particular to a method for efficiently separating arsenic from volatilized arsenic-containing smoke and dust by-produced in the pyrometallurgical process. Background technique [0002] In the process of pyrometallurgy, arsenic compounds are easily volatilized into the flue gas, resulting in a large amount of arsenic-containing smoke. In addition to arsenic, these smoke and dust also contain valuable metals such as lead, zinc, antimony, copper, gold, silver, etc., which have a high recovery value. However, due to the great harm of arsenic to the environment, it is difficult for the traditional smelting process to treat this kind of smoke efficiently and environmentally friendly. Therefore, the development of efficient and environmentally friendly arsenic removal technology for arsenic-containing fumes has become an urgent need. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04
CPCY02P10/20
Inventor 陈霖郝占东杨天足陈威刘伟锋张杜超
Owner CENT SOUTH UNIV
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