Method for separating arsenic and alkali in arsenic and alkali residues based on superfine ferric hydroxide colloid

A technology for ferric hydroxide and arsenic-alkali residue, which is applied in the field of comprehensive utilization of resources, can solve the problems of low efficiency, high cost, and difficult disposal of arsenic-removing waste residue, and achieves the effects of low energy consumption, low cost, and improved arsenic-alkali separation efficiency.

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

[0005] In view of the defects of high cost, low efficiency, and difficult treatment of arsenic residues in the prior art arsenic-alkali slag treatment method, the purpose of the present invention is to provide a method of using highly active ultra-fine ferric hydroxide A method for adsorbing and enriching arsenate and converting arsenate into stable ferric arsenate crystals to realize the efficient separation of arsenic and alkali in the leaching solution of arsenic-alkali slag. This method is low in cost, environmentally friendly, simple in process, and convenient in operation, meeting industrial production

Method used

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  • Method for separating arsenic and alkali in arsenic and alkali residues based on superfine ferric hydroxide colloid
  • Method for separating arsenic and alkali in arsenic and alkali residues based on superfine ferric hydroxide colloid
  • Method for separating arsenic and alkali in arsenic and alkali residues based on superfine ferric hydroxide colloid

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Embodiment 1

[0047] Preparation of ferric hydroxide colloid: configuring Fe 3+ A solution with a concentration of 20g / L (pH3+ Quickly add a neutralizing agent to the solution, and stir at a high speed to adjust the pH to about 5. After reacting for 10 minutes, continue to add the neutralizing agent to adjust the pH to 8-9 to obtain highly active ultrafine Fe(OH) 3 colloid;

[0048] Preparation of ferric arsenate crystal nuclei: configure 5g / L ferrous sulfate solution, add 10g / L sodium arsenite to it, control the reaction temperature at 85°C, slowly add oxidant to convert ferrous ions into ferric ions, ferrous ions Arsenate is transformed into arsenate, and sodium hydroxide is used as a neutralizing agent to adjust the pH to 5-6 to obtain iron arsenate crystal nuclei with good crystallization properties;

[0049] 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...

Embodiment 2

[0053] The preparation of ferric hydroxide colloid and ferric arsenate crystal nucleus is as in Example 1.

[0054] 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 15.56g / L, the Sb content is 3.12g / L, and the sodium carbonate content is 50.23g / 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 80-85°C, and the leaching time is 60 minutes. The filtrate obtained by filtering is sodium carbonate, sodium arsenate and The mixed solution of sodium antimonate and the leach slag are returned to the antimony smelting system. Add 0.06g ultra-fine pyrrhotite catalyst to the filtrate, then add sodium hypochlorite, react for 30min, magnetic separation (magnetic field strength 1000GS) separate pyrrhotite and recycle, non-magnetic components are filtered to obtain sodium arsen...

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Abstract

The invention discloses a method for separating arsenic and alkali in arsenic and alkali residues based on a superfine ferric hydroxide colloid. The method includes the steps: leaching the arsenic andalkali residues by water, and performing antimony removal on leaching solution through oxidation to obtain solution containing sodium carbonate and sodium arsenate; adding iron arsenate crystal nucleus and the superfine ferric hydroxide colloid to perform reaction to obtain iron arsenate crystals, and performing solid-liquid separation to obtain solution containing sodium carbonate and an iron arsenate product; leading carbon dioxide into the solution containing the sodium carbonate to perform reaction to separate out sodium hydrogen carbonate crystals, and performing thermal decomposition onthe sodium hydrogen carbonate crystals to obtain a sodium carbonate product. According to the method, arsenate in arsenic and alkali residue leaching solution is adsorbed and converted by the superfine Fe (OH)3 colloid with high activity to generate stable iron arsenate precipitation with low solubility and good crystal property, arsenic and alkali in arsenic and alkali residue leaching solutionare effectively separated, and the method overcomes the shortcomings of low iron salt arsenic removal utilization efficiency, incomplete purification and the like under the strong alkaline condition,is simple in process and convenient to operate and meets industrial production.

Description

technical field [0001] The invention relates to a method for separating arsenic and alkali in arsenic-alkali slag, in particular to an ultrafine Fe(OH) 3 The preparation of colloid and its method for efficient separation of arsenic and alkali in arsenic-alkali slag belong to the technical field of comprehensive utilization of resources. Background technique [0002] At present, arsenic pollution has attracted worldwide attention, and the effective treatment of arsenic-alkali slag is urgent. Arsenic-alkali slag is the solid waste produced in the process of pyrochemical antimony-alkali arsenic removal. In the antimony smelting process, arsenic enters the crude antimony after being oxidized and reduced, and soda ash is added to remove arsenic to obtain refined antimony during crude antimony refining; the main components of the arsenic-alkali slag produced by antimony refining are sodium carbonate, sodium arsenate, and antimonous acid Sodium, sodium thioantimonite and a small ...

Claims

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Application Information

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IPC IPC(8): C01G49/02C01G49/00C01G30/02C01D7/40C01D7/38
CPCC01D7/38C01D7/40C01G30/023C01G49/00C01G49/02C01P2006/80
Inventor 胡岳华孙伟韩海生许志杰刘屾淼张荥斐王丽杨越张晨阳
Owner CENT SOUTH UNIV
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