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Immobilization method of arsenic in arsenic-containing solution

A solution and content technology, applied in the field of pollutant treatment, can solve the problems of many operation steps, difficult filtration and separation of mixed precipitation, incomplete iron precipitation, etc., and achieves the effect of high purity, accelerated oxidation speed, and reduction of acid used for solution acidification.

Inactive Publication Date: 2018-06-15
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 105753218 A discloses a method for removing trivalent arsenic. First, use ozone to oxidize trivalent arsenic to pentavalent arsenic, then oxidize the added divalent iron source to trivalent iron by air, and react with pentavalent arsenic. Generate scorodite crystal precipitation and goethite precipitation, but the mixed precipitation produced by this method is difficult to filter and separate, and because the iron and arsenic ratio is high, the iron precipitation is incomplete, and subsequent alkali treatment is required, and there are many operating steps

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  • Immobilization method of arsenic in arsenic-containing solution

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Embodiment 1

[0056] This embodiment provides a method for immobilizing arsenic in an arsenic-containing solution, the method comprising the following steps:

[0057] (1) Sodium arsenite and ferric sulfate were dissolved in water to prepare a solution with arsenic and iron concentrations of 1g / L, to simulate arsenic-containing drainage in mines, take 1L of the solution, adjust the pH to 1.0 with sulfuric acid, and add to the solution The ozone-containing gas prepared by an ozone generator using air as a raw material is passed into the medium, and the ozone concentration is 40mg / L, and the gas is ventilated for 1h under stirring conditions, and the trivalent arsenic is oxidized to pentavalent arsenic to obtain a solution containing pentavalent arsenic ;

[0058] (2) Add ferrous sulfate heptahydrate to the solution obtained in step (1), so that the mol ratio of iron and arsenic in the solution is 1.5:1, stir and dissolve and then heat up to 90°C, and then feed the gas with an ozone concentrat...

Embodiment 2

[0061] This embodiment provides a method for immobilizing arsenic in an arsenic-containing solution, the method comprising the following steps:

[0062] (1) A bioleaching waste liquid of arsenic-containing gold concentrate, wherein the concentration of arsenic is 2.8g / L, the concentration of iron is 3.6g / L, and the initial pH is 1.2. Get 1L of this solution, and pass into it by ozone The generator uses air as the raw material to produce ozone-containing gas, in which the ozone concentration is 80mg / L, and it is ventilated for 2 hours under stirring conditions to oxidize trivalent arsenic to pentavalent arsenic to obtain a solution containing pentavalent arsenic;

[0063] (2) Add ferrous chloride tetrahydrate to the solution that step (1) obtains, make the mol ratio of iron and arsenic in the solution be 2:1, be warming up to 85 ℃ after stirring and dissolving, pass into ozone concentration again and be 80mg / L Gas, ferrous iron is oxidized to ferric iron, ferric iron reacts wit...

Embodiment 3

[0066] This embodiment provides a method for immobilizing arsenic in an arsenic-containing solution, the method comprising the following steps:

[0067] (1) A kind of arsenic-containing waste residue leaching solution produced by copper smelting, wherein the concentration of arsenic is 6g / L, the concentration of iron is 0.5g / L, and the initial pH is 1.0. Take 1L of this solution and pass it into it by an ozone generator Ozone-containing gas prepared from oxygen as a raw material, wherein the ozone concentration is 120 mg / L, is aerated for 3 hours under stirring conditions, and trivalent arsenic is oxidized to pentavalent arsenic to obtain a solution containing pentavalent arsenic;

[0068] (2) add ferrous sulfate to the solution that step (1) obtains, make the mol ratio of iron and arsenic in the solution be 1:1, be warming up to 95 ℃ after stirring and dissolving, pass into the gas that ozone concentration is 120mg / L again, will Ferrous iron is oxidized to ferric iron, and fe...

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Abstract

The invention provides an immobilization method of arsenic in arsenic-containing solution. The immobilization method of arsenic in arsenic-containing solution comprises following steps: under acidic conditions, an oxidizing agent is added into an arsenic-containing solution for oxidation so as to obtain a solution containing pentavalent arsenic; a ferrous salt is added, the pH value and the temperature of the solution are adjusted, the oxidizing agent is added for reaction so as to obtain scorodite crystal precipitate. According to the immobilization method, utilization of the strong oxidationperformance of ozone is adopted, oxidation of trivalent arsenic and ferrous is carried out successively, the scorodite crystal precipitate is obtained, crystal growth speed is accelerated, reaction process is simplified via controlling reaction conditions; and in addition, the immobilization method can be used for treating low concentration arsenic-containing solution, is suitable for treatment of most industrial arsenic-containing waste water, no pre-condensation treatment is needed, cost is low, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment and relates to a method for immobilizing arsenic in an arsenic-containing solution. Background technique [0002] Arsenic is a highly toxic element, and a small amount of ingestion can cause death. Chronic arsenic poisoning can cause cancer and other diseases. In principle, to eliminate arsenic pollution, it is necessary to avoid the diffusion of arsenic in soil and water as much as possible. secondary pollution. The U.S. National Environmental Protection Agency believes that under realistic conditions, the arsenic-containing waste residue and arsenic in wastewater should be harmlessly treated to form a stable and low-toxic solid residue, that is, "solidification / stabilization" of arsenic. ) is the best choice. [0003] scorodite (FeAsO 4 2H 2 O) has a high arsenic content (>30%), good stability, low iron-arsenic molar ratio (about 1:1), and much lower storage cost than other a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G49/00C02F101/10
CPCC01G49/00C02F1/58C02F1/66C02F1/78C02F9/00C02F2101/103
Inventor 张广积张凯伦杨超李媛媛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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