Method for desorbing arsenic from arsenic-containing soot

A technology for removing arsenic dust and dust, which is applied in the field of secondary resource utilization of complex nonferrous metals, can solve problems such as arsenic loss, operating environment hazards, and hidden safety hazards, and achieve the effects of increasing added value, good arsenic removal effect, and simple process

Active Publication Date: 2019-01-04
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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  • Method for desorbing arsenic from arsenic-containing soot

Examples

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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 desorbing arsenic from an arsenic-containing soot, and belongs to the field of secondary resource utilization of complicated nonferrous metals. The method comprisesthe following steps: under the condition of vacuum, carrying out arsenic pre-removal treatment on the arsenic-containing soot by carbon thermal reduction reaction; and then removing arsenic slag andcarrying out sulphidizing roasting. The arsenic-containing soot which contains arsenate and an arsenic phase of which the arsenide is complicated and is difficult to treat can be treated, the arsenicremoval effect is good, the process is simple, the method is environmentally friendly, the arsenic content of the treated soot is lower than 2%, moreover, the soot is rich in valuable metals such as lead, zinc, copper and bismuth and rare metals such as indium, silver and gold, and can be directly utilized comprehensively later, a purpose of desorbing the arsenic from the arsenic-containing soot is achieved, furthermore, the valuable metals such as the lead, the zinc, the copper and the bismuth in the arsenic-containing soot can be enriched, low-toxicity treatment on hazardous wastes is carried out, and meanwhile, the additional value is increased.

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 Applications(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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