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Electrochemical method for separating arsenic and alkali from arsenic-alkali residue

An arsenic-alkali residue and electrochemical technology, applied in the field of comprehensive utilization of resources, can solve the problems of low efficiency, high energy consumption, incomplete arsenic-alkali separation, etc., and achieve the effects of low energy consumption, reduced recovery difficulty, and complete arsenic-alkali separation.

Active Publication Date: 2018-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the defects of low efficiency, incomplete separation of arsenic and alkali, and large energy consumption in the separation process 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 generating active ferrous hydroxide and ferrous hydroxide, and use ferric hydroxide to absorb and convert arsenate ions to generate stable, crystalline iron arsenate precipitation method, this method realizes the fast and efficient removal of arsenic in the strong alkaline arsenic-alkali slag leaching solution, and The process is simple, the operation is convenient, and the energy consumption is low, which can reduce the use of oxidants in the process of electrocoagulation to remove arsenic, and meet the requirements of industrial production

Method used

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  • Electrochemical method for separating arsenic and alkali from arsenic-alkali residue
  • Electrochemical method for separating arsenic and alkali from arsenic-alkali residue
  • Electrochemical method for separating arsenic and alkali from arsenic-alkali residue

Examples

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Embodiment 1

[0035] Using this process to treat the secondary arsenic-alkali slag of an antimony smelter in Hunan, the As content is as high as 4.8%, the Sb content is 5.42%, and the sodium carbonate content is 25.31%. Take 50g of arsenic-alkali slag, add 5g of sodium peroxide, grind for 10min, and ensure that -200 mesh accounts for 82%, add 250mL of water, stir at 100r / min at a high speed, leaching temperature at 80°C, leaching time of 60min, and the filtrate obtained by filtering is carbonic acid-containing The mixed solution of sodium and sodium arsenate, the leaching residue is returned to the antimony smelting system. Next, add a sodium carbonate solution with a concentration of 1% to the electrolytic cell, use the iron electrode as the anode, and use the carbon electrode as the cathode to perform electrolysis at a temperature of 50°C and a current density of 25mA / cm 2 , the time is 35min, active Fe is generated in the anode area 2+ Ions are added to the arsenic-alkali slag leaching ...

Embodiment 2

[0039] 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 10.28%, the Sb content is 4.12%, and the sodium carbonate content is 26.61%. Take 50g of arsenic-alkali slag, add 12g of sodium peroxide, grind for 10 minutes to ensure that -200 mesh accounts for 86%, add 250mL of water, stir at 80r / min at a high speed, leaching temperature is 85°C, leaching time is 60min, and the filtrate obtained by filtering is carbonic acid-containing The mixed solution of sodium and sodium arsenate, and the leached slag are returned to the antimony smelting system. Next, add a concentration of 1% sodium carbonate solution to the electrolytic cell, use the iron electrode as the anode, and use the carbon electrode as the cathode to perform electrolysis at a temperature of 60°C and a current density of 30mA / cm 2 , the time is 30min, active Fe is generated in the anode area 2+ Ions are added to the arsenic-a...

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Abstract

The invention discloses an electrochemical method for separating arsenic and alkali from arsenic-alkali residue. The method comprises the following steps that oxidation and water immersion are carriedout on the arsenic-alkali residue so as to obtain an arsenic-alkaline residue leachate containing sodium carbonate and sodium arsenate; a sodium carbonate solution serves as an electrolyte, an iron electrode serves an anode, a carbon electrode serves as a cathode, then electrolysis is carried out, and active ferrous hydroxide is generated in the electrolyte; and the arsenic-alkali residue leachate is added into the electrolyte containing the active ferrous hydroxide, and then electrolysis is carried out to generate iron arsenate crystal precipitates. According to the method, antimony is separated from the arsenic-alkali residue by using oxidization and water immersion, and then the electrochemical method is used for converting the arsenic in the leachate into ferric arsenate particles with good crystallinity, so that efficient separation of the arsenic and the alkali is realized; the method can be used for quickly, efficiently and economically removing the arsenic from a strong alkaline solution, and the use of an oxidizing agent in the arsenic removal process is reduced; and the method is simple in process, convenient to operate and capable of meeting the industrial production.

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 by using an electrochemical method, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] Most of the naturally occurring antimony ores are associated with arsenic ores, and arsenopyrite (FeAsS) is the main form of arsenic. In the process of pyrometallurgy, most of the arsenic in antimony ore will be oxidized and volatilized, and the rest will enter the reduction furnace to produce crude antimony. In the industry, the principle of the difference in thermodynamic trend of high-valent oxides of arsenic and antimony is often used to preferentially oxidize arsenic by fire refining, and finally arsenic-alkali slag with arsenic content of about 5% to 10% can be obtained, and the arsenic content has reached Remove standard antimony ore. [000...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B7/04C22B30/04C25B1/00
CPCC22B7/008C22B7/04C22B30/04C25B1/00Y02P10/20
Inventor 韩海生胡岳华孙伟张荥斐刘屾淼许志杰王丽杨越
Owner CENT SOUTH UNIV
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