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Efficient separation method for arsenic and alkali in arsenic alkali residues

A separation method and technology of arsenic-alkali slag, which is applied in the treatment of arsenic-alkali slag and the efficient separation of arsenic and alkali in arsenic-alkali slag, can solve the problems of low efficiency, high cost, and incomplete separation of arsenic-alkali slag, and achieve the separation effect Good, easy to operate, and the effect of improving the value of recycling

Active Publication Date: 2018-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of high cost, low efficiency, and incomplete separation of arsenic and alkali in the treatment method of high-alkali arsenic slag in the prior art, the purpose of the present invention is to provide a method that can realize the arsenic and alkali in arsenic-alkali slag quickly, efficiently and at low cost. Separation method, the method is simple in process, easy to operate, and satisfies industrialized production

Method used

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  • Efficient separation method for arsenic and alkali in arsenic alkali residues
  • Efficient separation method for arsenic and alkali in arsenic alkali residues
  • Efficient separation method for arsenic and alkali in arsenic alkali residues

Examples

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Embodiment 1

[0047] Using this process to treat the secondary arsenic-alkali slag of an antimony smelter in Hunan, the As content of the polluted acid is as high as 9.78g / L, the Sb content is 5.42g / L, and the sodium carbonate content is 41.34g / L. Take 50g of arsenic-alkali slag, grind it for 10 minutes, and ensure that -200 mesh accounts for 82%, add 250ml of water, stir at high speed, leaching temperature is 80°C, leaching time is 60 minutes, and the filtrate obtained by filtering is sodium carbonate, sodium arsenate and antimonous acid The mixed solution of sodium and the leaching slag are returned to the antimony smelting system. Add 0.04g ultra-fine pyrrhotite catalyst to the filtrate, then add hydrogen peroxide with a concentration of 30%, react for 30 minutes, magnetic separation (magnetic field strength 800GS) separate pyrrhotite and recycle it, and filter the non-magnetic component to obtain arsenic Sodium acid solution, sodium antimonate is returned to the antimony smelting system...

Embodiment 2

[0052] Using this process to treat the secondary arsenic-alkali slag of an antimony smelter in Hunan, the As content of the polluted acid is as high as 11.28g / L, the Sb content is 3.12g / L, and the sodium carbonate content is 26.61g / L. Take 50g of arsenic-alkali slag, grind it for 10 minutes, and ensure that -200 mesh accounts for 86%, add 250ml of water, stir at high speed, the leaching temperature is 85°C, and the leaching time is 60 minutes. The filtrate obtained by filtering is sodium carbonate, sodium arsenate and antimonous acid. The mixed solution of sodium and the leaching slag are returned to the antimony smelting system. Add 0.06g superfine pyrrhotite catalyst to the filtrate, then add sodium hypochlorite, react for 25min, magnetic separation (magnetic field strength 1000GS) separate pyrrhotite and recycle, non-magnetic component filtration is sodium arsenate solution, Sodium antimonate is returned to the antimony smelting system. Heat the filtrate to 90°C, add 80mg / ...

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Abstract

The invention discloses an efficient separation method for arsenic and alkali in arsenic alkali residues. The method is characterized in that the arsenic and the alkali in the arsenic alkali residuesare enabled to enter a solution through a water leaching method, then arsenate is transformed into organic arsenate through a catalytic reaction, the organic arsenate can be chelated and precipitatedwith heavy metal ions very easily, the solubility product of the organic arsenate is very small, the difference between the arsenic-containing component and the carbonate or the hydroxyl is expanded,and therefore the organic arsenate is converted into organic arsenic acid heavy metal salt precipitate through an anode electrolysis technology, the organic arsenate is completely separated from the alkali liquor, and the organic arsenic acid heavy metal salt precipitate is converted into an arsenic oxide or an elementary substance As through pyrogenic attack. According to the method, the arseniccan be removed from the high-alkaline solution in a rapid, efficient and economical way, the process is simple, and the operation is convenient; and the method can meet the requirements of industrialproduction.

Description

technical field [0001] The invention relates to a treatment method for arsenic-alkali slag, in particular to an efficient separation method for arsenic and alkali in arsenic-alkali slag, and belongs to the technical field of metallurgical waste slag reuse. Background technique [0002] The arsenic in the arsenic-alkali slag produced by antimony refining mainly exists in the form of sodium arsenate, which is highly toxic and easily soluble in water, so it is not suitable to be stacked in the open air. At present, the total stockpile of arsenic-alkali slag in my country has reached more than 50,000 tons, and it is increasing at a rate of 0.5-10,000 tons every year. A large backlog of arsenic-alkali slag increases the management cost of many antimony smelting enterprises, and also poses a serious threat to the ecological environment. and the great concern of the vast number of scientific and technological workers. [0003] At present, the treatment methods of arsenic-alkali s...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B30/02C22B30/04
CPCC22B7/006C22B30/02C22B30/04Y02P10/20
Inventor 孙伟韩海生胡岳华王丽杨越
Owner CENT SOUTH UNIV
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