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Method for removing arsenic from acid solution

An acidic solution and removal technology, which is applied in the field of arsenic removal, can solve the problems of secondary pollution of the environment, the arsenic cannot be recycled and used, and the arsenic removal agent cannot be recycled, so as to achieve low cost of use and solve the problem of secondary pollution Effect

Inactive Publication Date: 2013-11-27
GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is following shortcoming in above-mentioned technological process: with Fe(OH) 3 For adsorption or removal of insoluble arsenate, trivalent arsenic must first be oxidized to pentavalent arsenic, and a certain ratio of iron to arsenic is also required, and it is oxidized while neutralizing
The above-mentioned methods also have a common weakness that the arsenic removal agent cannot be recycled, and the arsenic cannot be recycled and applied, causing secondary pollution to the environment

Method used

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  • Method for removing arsenic from acid solution

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1: get 100 grams of TiO 2 , nH 2 O, installed in a Φ20mm glass tube, the effective column height is 100mm, and then use H containing As5, 2g / L, Zn 94g / L, Fe 0.6g / L, pH value 1.5 2 so 4 The leachate is subjected to natural osmosis filtration at a speed of 5-10ml / min, the filtrate As13.2mg / L, Zn 92.3g / LFe 0.52g / L, adsorption rate As97.6%, Zn: 2.16%Fe: 2.01%, capacity 3.6L / g TiO 2 , nH 2 The adsorption amount of O and As is 187mg / gTiO 2 , nH 2 O. The TiO that adsorbed As subsequently 2 , nH 2 O is washed once, twice with alkali, and once again with water, the total elution of As is 99.1%, one alkali wash contains As28g / L, and two alkali washes 8.3g / L.

example 2

[0020] Example 2: 200gTiO 2 , nH 2 O is put into a Φ100mm microporous ceramic funnel with an effective layer height of 20mm, and then ZnSO with a pH value of 3.2 containing As 8.7g / L and Zn106g / L 4The solution is vacuum pumped and filtered at a speed of 30-50ml / min. When the processing capacity is 40 liters of solution, the adsorption rate of As is 94.1%. After adsorption, the solution contains As 0.5g / L Zn 112g / L. / g TiO 2 , nH 2 When O, the adsorption rate drops to 68.3%, and alkali washing regeneration is carried out. Carry out vacuum pump suction filtration adsorption again. The adsorption rate of As rose to 97.8%. The first alkaline washing solution contained As 18g / L, and the second alkaline washing solution contained As9.5g / L.

example 3

[0021] Example 3: Get the In stripping liquid H containing As10% 2 o 2 The purification residue is leached with 100-120g / L HCl to obtain an HCl leaching solution containing 25g / L In and 32.8g / L As. Use 60gTiO 2 , nH 2 O is equal to 3.3 according to the liquid-solid ratio, adding HCl leaching solution, stirring adsorption and filtering for 30 minutes at room temperature. The obtained filtrate contains As24.7g / L, and the adsorption rate is 24.7%, and then regenerated TiO 2 , nH 2 060g is stirred and adsorbed, and the filtrate contains As2.46g / L, and the adsorption rate is 90%, and then 60g is used to regenerate TiO 2 , nH 2 O carries out stirring adsorption for the third time, and the obtained filtrate contains As 0.75g / L, In 22.4g / L, the adsorption rate of As is 69.5%, In 10.4%, and the total removal rate of three stirring adsorption As is 97.7%, In:10.4% .

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Abstract

The present invention discloses a method for removing arsenic from an acid solution, and relates to the technical field of hydrometallurgy, wherein TiO2 and nH2O can be adopted to carry out absorption removal of trivalent arsenic and pentavalent arsenic from a H2SO4 solution containing 10 mg / L-30 g / L of arsenic and a HCl solution containing 10 mg / L-30 g / L of arsenic, and acidity of an acid solution is 0.5-150 g / L. The adopted removal method can comprises: carrying out nature infiltration through an ion exchange column, carry out vacuum filtration, stirring according to a liquid-solid ratio, and carrying out pressure filtration with a pressure filter, wherein a 10-20% NaOH solution is adopted to wash and regenerate TiO2 absorbing arsenic and nH2O absorbing arsenic, an arsenic absorption effect is not reduced, the alkali washing solution is treated to obtain a sodium arsenate crystal containing more than 50% of arsenic, Zn<2+> and In<3+> are not be absorbed during arsenic removal processes of a zinc sulfate solution and an indium chloride solution, and arsenic and germanium are absorbed in a Ge-containing solution. With the method, arsenic can be effectively recovered, the problem of secondary pollution of arsenic in other methods is solved, and a certain economic value is produced.

Description

Technical field: [0001] The invention relates to a method for removing arsenic from acid solution, belonging to the technical field of hydrometallurgy. Background technique: [0002] The traditional process of removing arsenic in hydrometallurgy is to use Fe(OH) in the process of neutralization and oxidation to remove iron. 3 Adsorption precipitation or formation of insoluble arsenate precipitation for removal. In solutions containing low arsenic, the metal replacement method is used to replace AsH 3 Form removed. There is following shortcoming in above-mentioned technological process: with Fe(OH) 3 For adsorption or removal of insoluble arsenate, trivalent arsenic must first be oxidized to pentavalent arsenic, and a certain ratio of iron to arsenic is required, and oxidation is performed while neutralizing. Therefore, the removal time is long, the amount of slag is large, and the loss of valuable metals is large. At the same time, the arsenic-containing iron slag needs...

Claims

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Application Information

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IPC IPC(8): C22B3/24C22B30/04
CPCY02P10/20
Inventor 李世平倪常凯韦国龙
Owner GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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