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Method for achieving efficient and comprehensive resource utilization of arsenic-alkali residues

An arsenic-alkali residue and recycling technology, applied in the field of comprehensive utilization of resources, can solve the problems of incomplete arsenic-alkali separation, high cost and low efficiency, and achieve the effects of complete arsenic-alkali separation, low cost and low energy consumption

Active Publication Date: 2018-10-02
CENT SOUTH UNIV
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  • 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 for capturing arsenic in the leaching solution of arsenic-alkali slag by using metal ammonium complex ions. Acid ion and converted into ammonium arsenate metal salt precipitation with good stability, good crystallinity and low solubility, so as to realize the efficient separation of arsenic and alkali in the arsenic-alkali slag leaching solution. This method is fast, efficient, low-cost, and the process is simple , Easy to operate, low energy consumption, to meet industrial production

Method used

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  • Method for achieving efficient and comprehensive resource utilization of arsenic-alkali residues
  • Method for achieving efficient and comprehensive resource utilization of arsenic-alkali residues

Examples

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Embodiment 1

[0046] Using this process to treat the secondary arsenic-alkali slag of an antimony smelter in Hunan, the As content is as high as 9.78%, the Sb content is 5.42%, and the sodium carbonate content is 41.34%. Take 50g of arsenic-alkali slag, add 10g of sodium peroxide, grind for 10 minutes to ensure -200 mesh accounts for 82%, add 250mL of water, stir at high speed, leaching temperature 80-85 ℃, leaching time 60min, and the filtrate obtained by filtering is sodium carbonate , a mixed solution of sodium arsenate and sodium antimonite, and the leached slag is returned to the antimony smelting system. Add 1.2 times the standard amount of magnesium oxide to ammonia water, ammonium carbonate, ammonium bicarbonate or ammonium sulfate solution, the reaction temperature is 55 ° C, and react for 30 minutes, add the leachate to the solution containing metal ammonium complex ions, and add 2 g of citric acid To promote the crystal growth of crystals, the reaction temperature is 60°C, and th...

Embodiment 2

[0050] Using this process to treat the secondary arsenic-alkali slag of an antimony smelter in Hunan, the As content is as high as 11.28%, the Sb content is 3.12g%, and the sodium carbonate content is 26.61%. Take 50g of arsenic-alkali slag, add 18g of sodium peroxide, grind for 10min, ensure that -200 mesh accounts for 86%, add 250mL of water, stir at high speed, leaching temperature 80-85℃, leaching time 60min, and the filtrate obtained by filtering is sodium carbonate , a mixed solution of sodium arsenate and sodium antimonite, and the leached slag is returned to the antimony smelting system. Add 1.2 times the standard amount of zinc oxide to ammonia water, ammonium carbonate, ammonium bicarbonate, ammonium chloride or ammonium sulfate solution, react at a temperature of 60°C, and react for 20 minutes, add the leachate to the solution containing metal ammonium complex ions, and Add 2g of citric acid to promote the crystallization growth of the crystal. The reaction temperat...

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Abstract

The invention discloses a method for achieving efficient and comprehensive resource utilization of arsenic-alkali residues. The method comprises the steps that after oxidation and water logging are conducted on the arsenic-alkali residues, solid-liquid separation is conducted, so that leachate and antimony-enriched residues are obtained; an ammonium-source solution is made to react with metallic oxide, so that a metallic ammonium complex ion solution is obtained; the metallic ammonium complex ion solution and a crystal growth accelerant are added to the leachate for a reaction, a mixed solution obtained after the reaction is sequentially subjected to aging, crystallization, precipitation and solid-liquid separation, and an obtained solid phase is an ammonium arsenate metallic salt product;and firstly, treatment of heating for ammonium removal is conducted on a liquid phase, then, carbon dioxide is introduced for a reaction, so that sodium bicarbonate crystals are separated out, and thermal decomposition is conducted on the sodium bicarbonate crystals, so that a sodium carbonate product is obtained. By means of the method, antimony, alkali and arsenic can be rapidly and efficientlyseparated out of the arsenic-alkali residues; the effect that the arsenic is efficiently separated from the alkali is achieved; and in addition, the method is low in cost, simple in process and convenient to operate, and the requirement of industrialized production is met.

Description

technical field [0001] The invention relates to a treatment method for arsenic-alkali slag, in particular to a method for efficiently separating arsenic and alkali in arsenic-alkali slag, and belongs to the technical field of comprehensive utilization of resources. 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 should not 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 50,000 to 10,000 tons per year. A large backlog of arsenic and alkali slag increases the management cost of many antimony smelting enterprises, and also poses a serious threat to the ecological environment. [0003] The disposal methods of arsenic-alkali slag include landfill, fire method and wet method. Landfill treatment has been rarely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/04
CPCC22B7/006C22B30/04Y02P10/20
Inventor 孙伟胡岳华韩海生刘屾淼张荥斐许志杰王丽杨越
Owner CENT SOUTH UNIV
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