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Antimony smelting arsenic-alkali residue and smelting off-gas comprehensive treatment method

A technology for comprehensive treatment of smelting flue gas, which is applied in the comprehensive treatment of antimony smelting arsenic-alkali slag and smelting flue gas. The leaching toxicity is unqualified, there are hidden dangers of dissolution, pipelines are easily blocked, etc., to achieve the effect of improving the level of green and clean circulation production, the filtration process is stable and smooth, and the production continuity is high.

Inactive Publication Date: 2019-06-21
CHENZHOU YANGTAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology realizes the reduction and recycling of arsenic-alkali slag, but there are still several problems in the actual production and operation: 1) The arsenic-alkali residue is not completely separated, and the mixture of sodium arsenate and sodium carbonate is easily soluble in water and highly toxic , there is no market, and the storage risk is greater; 2) The leaching toxicity of the output slag is unqualified, and it is still a hazardous waste; 3) The system equipment pipeline is easy to block, the production continuity is poor, and the production capacity is low
But this process also has some disadvantages: the valuable resource (sodium carbonate) in the soaking liquid has not been effectively recycled, but it is neutralized by adding acid, which increases the production cost; the three-stage arsenic precipitation of lime milk produces a large amount of arsenic containing 20% Although the above mixed slag of calcium sulfate and calcium arsenate is solidified, the arsenic content is too high and there is a hidden danger of dissolution; needs further processing
The technical process is long and the investment is large

Method used

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  • Antimony smelting arsenic-alkali residue and smelting off-gas comprehensive treatment method
  • Antimony smelting arsenic-alkali residue and smelting off-gas comprehensive treatment method
  • Antimony smelting arsenic-alkali residue and smelting off-gas comprehensive treatment method

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Effect test

Embodiment 1

[0051] A method for wet processing antimony smelting arsenic-alkali slag, the method comprises the following steps:

[0052] (1) Soaking, sieving and crushing process: add 800ml of secondary leachate and 3700ml of tap water to 1500g of secondary arsenic-alkali slag, the liquid-solid ratio of secondary arsenic-alkali slag to leaching solution is 4:1, immerse at room temperature for 30 hours, stir After the pulping is complete, sieve to separate the slag and water, soak the slurry (including the slurry after the crushed oversize and the slurry after sieving) and enter the leaching process;

[0053] Wherein, the composition of secondary arsenic-alkali slag comprises (by mass percentage): Na 2 CO 3 50.83%, NaOH 0.86%, As 12.61%, Sb 1.27%, Al 2.32%, Si 3.26%;

[0054] (2) Leaching process: the arsenic-alkali slag is leached by two-stage countercurrent water leaching:

[0055] i. Heat preservation and leaching of the above soaking slurry, the conditions of heat preservation leac...

Embodiment 2

[0065] A method for wet processing antimony smelting arsenic-alkali slag, the method comprises the following steps:

[0066] (1) Soaking, sieving and crushing process: Add 5000ml of tap water to 1000g of primary arsenic-alkali slag, the liquid-solid ratio of primary arsenic-alkali slag and leachate is 8:1, immerse at room temperature for 48 hours, stir and slurry, after the slurries are complete, Sieve to separate slag and water, soak the slurry (including the slurry after the crushed oversize and the slurry after sieving) and enter the leaching process;

[0067] Wherein, the composition of primary arsenic-alkali slag comprises (by mass percentage): Na 2 CO 3 13.10%, NaOH 28.71%, As 11.64%, Sb 57.03%, Al 0.27%, Si 0.27%.

[0068] (2) Leaching process: the arsenic-alkali slag is leached by two-stage countercurrent water leaching:

[0069] i. Heat preservation and leaching the above soaking slurry. The conditions of heat preservation leaching are: heat preservation and leach...

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Abstract

The invention belongs to the technical field of arsenic-containing solid waste treatment and discloses an antimony smelting arsenic-alkali residue and smelting off-gas comprehensive treatment method with processes of wastes against one another. The method mainly comprises the six working procedures including the soaking, sieving and pulverizing procedure, the leaching procedure, the neutralizing procedure, the arsenic removing procedure, the alkali making procedure and the innocent treatment procedure, and treatment with processes of wastes against one another and innocent treatment of arsenic-alkali residue are achieved. The longstanding problem of environment pollution of the arsenic-alkali residue, that plagues the national antimony smelting industry, is thoroughly solved, and environmental risks caused by stockpiling of the arsenic-alkali residue are eliminated; and meanwhile, valuable elements are separated, enriched and effectively recovered.

Description

technical field [0001] The invention belongs to the technical field of arsenic-containing solid waste disposal, and relates to a method for comprehensive treatment of antimony smelting arsenic-alkali slag and smelting flue gas, in particular to a comprehensive treatment of antimony smelting arsenic-alkali slag and smelting flue gas by "using waste to treat waste" Methods. Background technique [0002] Arsenic-alkali slag is a toxic and corrosive hazardous solid waste listed in the "National Hazardous Waste List" produced in the production of antimony by pyrometallurgy. Arsenic-alkali slag is divided into primary arsenic-alkali slag and secondary arsenic Alkali slag, its output links are as follows figure 1 The flow chart of the antimony smelting process is shown. Since the mining and smelting of antimony for more than 100 years, there has been no effective disposal method for arsenic-alkali slag. According to statistics from the Hunan Provincial Academy of Environmental Sc...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B30/04
CPCY02P10/20
Inventor 林平平张展飞何良东袁凤美李启宏
Owner CHENZHOU YANGTAO CHEM
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