A method for removing arsenic from arsenic-containing smoke and dust

A technology of arsenic fume and dust, which is applied in the field of secondary resource utilization of complex nonferrous metals, and can solve problems such as arsenic loss, unsatisfactory arsenic removal effect, and potential safety hazards

Active Publication Date: 2021-08-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition to arsenic, arsenic-containing dust is also rich in valuable metals such as lead, copper, zinc, tin, and bismuth. If the arsenic-containing dust is directly returned to the smelter for smelting, the arsenic will continue to enrich, which will affect the purity of the main metal and also affect the purity of the main metal. can be hazardous to the operating environment
At present, arsenic in arsenic-containing smoke and dust is mainly produced in two ways: one is used to produce white arsenic (arsenic trioxide, also known as arsenic), and there are certain safety hazards in the fire method production process; the other is wet method, which uses iron arsenate Or the form of calcium arsenate precipitate is solidified and stockpiled, and long-term storage will cause the loss of arsenic
[0004] For example, the Chinese invention patent CN102321813A discloses a method for preparing crude arsenic by carbothermally reducing diarsenic trioxide in vacuum. Diarsenic trioxide is heated to volatilize and pass through the red-hot carbon reducing agent layer to obtain arsenic vapor, which can be condensed to obtain solid crude arsenic with a purity greater than 95%. The raw material of the method is arsenic trioxide with a purity greater than 80%, and the arsenic removal effect on arsenic-containing dust with complex arsenic phases and components is not ideal

Method used

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  • A method for removing arsenic from arsenic-containing smoke and dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Grind 200g of arsenic-containing fumes (containing 11.99% of arsenic, 10.98% of lead, 12.11% of zinc, 4.75% of copper, and 3.08% of bismuth) into an electric blast drying oven, and dry at 260°C for 5 hours; take 100g of dried Mix arsenic-containing fumes with 10g of sieved anthracite coal evenly, and put them into a self-made vacuum reactor; after vacuuming to below 500Pa, heat the reactor to 700°C at a heating rate of 17°C / min and keep it warm for 3 hours. The pressure in the medium reactor fluctuates within the range of 10-260Pa, and the temperature of the condensation zone fluctuates between 127-153°C; after the reaction, the arsenic-removed slag and condensate are taken out, the arsenic-removed slag contains 5.75% of arsenic, and the arsenic removal rate is 71.71% , the condensate contains 98.47% arsenic; take 20g of arsenic-removed slag, grind it to below 100 mesh, add 2g of sulfur powder, mix it evenly, and place it in the reactor; vacuumize the reactor to 5Pa, kee...

Embodiment 2

[0048] Grind 1000g of arsenic-containing fumes (containing 14.83% of arsenic, 13.95% of lead, 11.02% of zinc, 3.73% of copper, and 4.26% of bismuth) into an electric blast drying oven, and dry at 230°C for 10 hours; take 100g of dried Mix arsenic-containing fumes with 20g of sieved anthracite coal evenly, and put them into a self-made vacuum reactor; after vacuuming to below 20Pa, heat the reactor to 1000°C at a heating rate of 15°C / min, keep it warm for 5 hours, and keep it warm. The pressure inside the medium reactor varies between 15-550Pa, and the temperature in the condensation zone fluctuates between 170-246°C; after the reaction, the arsenic-removed slag and condensate are taken out, the arsenic-removed slag contains 7.66% of arsenic, and the arsenic removal rate is 70.93% , the condensate contains 95.94% arsenic; take 20g of arsenic-removed slag, grind it to below 100 mesh, add 4g of sulfur powder, mix it evenly, and place it in the reactor; vacuumize the reactor to 40P...

Embodiment 3

[0050] Grind 400g of arsenic-containing fumes (containing 18.72% of arsenic, 12.33% of lead, 15.01% of zinc, 3.31% of copper, and 4.33% of bismuth) into an electric blast drying oven, and dry at 240°C for 7 hours; take 100g of dried Mix arsenic-containing fumes with 10g of charcoal powder evenly, and put them into a self-made vacuum reactor; after vacuuming to below 650Pa, heat the reactor to 800°C at a heating rate of 20°C / min, and keep it warm for 10 hours. The pressure fluctuated between 20-870Pa, and the temperature in the condensation zone fluctuated between 133-172°C; after the reaction, the arsenic-removed slag and condensate were taken out. Arsenic 96.12%; take 20g of arsenic-removed slag, grind it to below 100 mesh, add 1g of sulfur powder, mix it evenly, and place it in the reactor; vacuum the reactor to 1000Pa, and heat the reactor at a heating rate of 15°C / min to 400°C, keep warm for 6h; after the reaction is over, take out the secondary arsenic removal slag after ...

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Abstract

The invention provides a method for removing arsenic from arsenic-containing smoke and dust, which belongs to the field of secondary resource utilization of complex nonferrous metals. The present invention uses carbothermal reduction reaction to pre-dearsenize the arsenic-containing fumes under vacuum conditions, and then sulfidizes and roasts the arsenic-removed slag, so that the arsenic-containing fumes containing arsenate and arsenic complex and difficult-to-handle arsenic phases can be processed. , good arsenic removal effect, simple process, and environmental friendliness. The arsenic content of the treated flue dust is less than 2%, and it is rich in valuable metals such as lead, zinc, copper, bismuth, and rare and precious metals such as indium, silver, and gold. It can be directly The follow-up comprehensive utilization not only achieves the purpose of de-arsenic from the arsenic-containing fume, but also enriches the valuable metals such as lead, zinc, copper, bismuth, etc. in the arsenic-containing fume. value.

Description

technical field [0001] The invention relates to the technical field of secondary resource utilization of complex nonferrous metals, in particular to a method for removing arsenic from arsenic-containing smoke. Background technique [0002] Arsenic-containing fumes mainly come from the pyro-smelting of non-ferrous metallurgical heavy metals such as copper, lead, tin, zinc, etc., especially in copper smelting, which produces the most arsenic-containing fumes. Metal complex oxides and the like exist in the dust. [0003] In addition to arsenic, arsenic-containing dust is also rich in valuable metals such as lead, copper, zinc, tin, and bismuth. If the arsenic-containing dust is directly returned to the smelter for smelting, the arsenic will continue to enrich, which will affect the purity of the main metal and also affect the purity of the main metal. can be hazardous to the operating environment. At present, arsenic in arsenic-containing smoke and dust is mainly produced in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/02C22B30/04C22B13/02C22B15/00C22B30/06C22B19/00
CPCC22B1/02C22B7/02C22B13/025C22B15/0017C22B19/00C22B30/04C22B30/06Y02P10/20
Inventor 徐宝强史腾腾杨斌蒋文龙杨佳刘大春邓勇熊恒李一夫曲涛田阳戴永年孔令鑫陈秀敏
Owner KUNMING UNIV OF SCI & TECH
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