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Co-treatment method for arsenic-containing waste acid and iron-arsenic waste residues

A co-processing, arsenic-acid technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high reagent cost, high treatment cost of enterprises and waste residue inventory , to achieve the effect of reducing the processing cost

Pending Publication Date: 2022-04-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the lime-iron salt precipitation method, although the scorodite (crystalline ferric arsenate) precipitation method requires less iron (the molar ratio of iron to arsenic is 1), the cost of chemicals is less, and the amount of slag produced is smaller, but it is still Need to use iron-containing reagents and generate high reagent costs, which brings pressure on enterprises with high processing costs and waste residue inventory

Method used

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  • Co-treatment method for arsenic-containing waste acid and iron-arsenic waste residues
  • Co-treatment method for arsenic-containing waste acid and iron-arsenic waste residues
  • Co-treatment method for arsenic-containing waste acid and iron-arsenic waste residues

Examples

Experimental program
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Effect test

Embodiment 1

[0051] At room temperature, add 2 mol / L Ca(OH) to 1L 6g / L arsenic acid (pH 0.14) 2 Solution, make the mol ratio of trivalent arsenic in calcium hydroxide and arsenic polluted acid be 1.2:1, carry out precipitation reaction 0.5h, to the pH value of 0.6 of arsenic polluted acid, carry out solid-liquid separation, obtain gypsum (calcium sulfate precipitation ) and arsenic-containing solution; adding hydrogen peroxide (H 2 o 2 : As=1.1) to carry out an oxidation reaction to obtain a solution containing pentavalent arsenic; under the condition of mechanical stirring (200rmp), the solution system containing pentavalent arsenic is heated up to 95°C, and the iron-arsenic waste residue slurry is added within 4h to make the system The molar ratio of total iron and total arsenic is 1.1:1, after the iron-arsenic waste slag is added, the co-precipitation reaction is continued for 4h (pH value is 1.1), and then solid-liquid separation is obtained to obtain scorodite and calcium sulfate mix...

Embodiment 2

[0053] At room temperature, add 2 mol / L Ca(OH) 2 Solution, make the mol ratio of trivalent arsenic in calcium hydroxide and arsenic polluted acid be 1.2:1, carry out precipitation reaction 0.5h, to the pH value of 0.7 of arsenic polluted acid, carry out solid-liquid separation, obtain gypsum (calcium sulfate precipitation ) and arsenic-containing solution; adding hydrogen peroxide (H 2 o 2 : As=1.1) to carry out an oxidation reaction to obtain a solution containing pentavalent arsenic; under mechanical stirring conditions (200rmp), the solution system containing pentavalent arsenic is warmed up to 95°C, and iron-arsenic waste residue slurry is added within 5h to make the system The molar ratio of total iron and total arsenic is 1.1:1, and after the addition of iron and arsenic waste residue, continue the co-precipitation reaction for 4h (pH value is 1.2), and then separate the solid and liquid to obtain the mixed precipitate and filtrate of scorodite and calcium sulfate; Sod...

Embodiment 3

[0055] At room temperature, add 2 mol / L Ca(OH) 2 Solution, make the mol ratio of trivalent arsenic in calcium hydroxide and arsenic polluted acid be 1.1:1, carry out precipitation reaction 0.5h, to the pH value of 0.8 of arsenic polluted acid, carry out solid-liquid separation, obtain gypsum (calcium sulfate precipitation ) and arsenic-containing solution; adding hydrogen peroxide (H 2 o 2 : As=1.2) to carry out an oxidation reaction to obtain a solution containing pentavalent arsenic; under mechanical stirring conditions (300rmp), the solution system containing pentavalent arsenic is warmed up to 95°C, and iron-arsenic waste residue slurry is added within 5h to make the system The molar ratio of total iron and total arsenic is 1.1:1, after the addition of iron and arsenic waste residue, continue coprecipitation reaction for 5h (pH value is 1.1), and then separate solid and liquid to obtain mixed precipitate and filtrate of scorodite and calcium sulfate; The sodium aqueous s...

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Abstract

The invention belongs to the technical field of arsenic-containing wastewater and solid waste treatment, and particularly relates to a co-treatment method for arsenic-containing waste acid and iron-arsenic waste residues. According to the method, the iron-arsenic waste residues are used for replacing ferric salt to treat the arsenic-containing waste acid, arsenic in the arsenic-containing waste acid and the iron-arsenic waste residues is fixed in the stable scorodite precipitate, the arsenic-containing waste residues with high stability can be obtained, the treatment cost and the waste residue yield can be reduced, and the pressure of the waste residue amount on a waste residue landfill is relieved.

Description

technical field [0001] The invention belongs to the technical field of arsenic-containing wastewater and solid waste treatment, and specifically relates to a method for co-processing arsenic-containing polluted acid and iron-arsenic waste residue. Background technique [0002] A large amount of high-concentration arsenic-containing polluted acid will be produced in the heavy non-ferrous metal smelting process and the sulfuric acid industrial flue gas acid production process. Arsenic in polluted acid mainly exists in the form of trivalent arsenic, and the concentration of trivalent arsenic can reach several grams or even dozens of grams per liter, which has extremely high toxicity, activity and mobility. Direct discharge or leakage of polluted acid into the environment will cause major environmental arsenic pollution accidents. Therefore, in view of the high toxicity of arsenic in sewage acid and the extremely high daily output of sewage acid in enterprises, non-ferrous smel...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10
Inventor 贾永锋马旭丁玉薛阳峰齐凤岱王少锋曾祥峰
Owner DALIAN UNIV OF TECH