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A long-term stabilization treatment method for arsenic-containing waste liquid arsenic

A technology for stabilizing treatment and waste liquid, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of high bulk density of scorodite in landfill, reduce the bulk density of scorodite, and avoid iron salts. The effect of polymer production, maintaining long-term stability, and increasing the rate of nucleation

Active Publication Date: 2021-12-03
CHANGSHA SCI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In view of the problems existing in the prior art, the object of the present invention is to provide a method for stabilizing arsenic in arsenic-containing waste liquid, which can improve the stability of scorodite alkali, and greatly reduce the bulk density of scorodite, and realize the arsenic While being stable for a long time, it also solves the problem of high bulk density of scorodite landfill

Method used

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  • A long-term stabilization treatment method for arsenic-containing waste liquid arsenic
  • A long-term stabilization treatment method for arsenic-containing waste liquid arsenic
  • A long-term stabilization treatment method for arsenic-containing waste liquid arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Synthesis of high-purity crystal scorodite:

[0038] The arsenic-containing waste liquid is the oxidation leaching liquid of arsenic sulfide slag, the concentration of arsenic is 25g / L, measure 500mL into a three-necked flask, put it into a magnetic rotor, and put it into a magnetic oil bath. According to the molar ratio of iron to arsenic of 2, weigh ferrous sulfate to prepare a solution, set the volume to 200mL, dilute hydrogen peroxide to a mass concentration of 5%, and connect the ferrous sulfate solution and hydrogen peroxide to a peristaltic pump. Sodium carbonate is prepared into a solution with a mass concentration of 30%, the pH is adjusted, and the pH meter and the redox potential are connected to the flask. Turn on the stirring, adjust the initial pH value of the arsenic-containing waste liquid to 2.00 with sodium carbonate solution, set the temperature of the magnetic heating stirrer at 60°C, turn on the heating, reach the set temperature, add ferrous sulfat...

Embodiment 2

[0042] Synthesis of high-purity crystal scorodite:

[0043] The arsenic-containing waste liquid is the oxidation leaching liquid of arsenic sulfide slag, the concentration of arsenic is 25g / L, measure 500mL into a three-necked flask, put it into a magnetic rotor, and put it into a magnetic oil bath. According to the molar ratio of iron to arsenic of 1.5, ferrous sulfate was weighed to prepare a solution, and the volume was fixed to 150mL. The hydrogen peroxide was diluted to a mass concentration of 5%, and the ferrous sulfate solution and hydrogen peroxide were connected to a peristaltic pump. Weigh sodium carbonate, prepare a solution with a mass concentration of 30%, and adjust the pH. Connect the pH meter and ORP to the flask. Turn on the stirring, adjust the initial pH value of the arsenic-containing waste liquid to 1.50 with sodium carbonate solution, set the temperature of the magnetic heating stirrer at 75°C, turn on the heating, reach the set temperature, add ferrous ...

Embodiment 3

[0047] Synthesis of high-purity crystal scorodite:

[0048] The arsenic-containing waste liquid is the oxidation leaching liquid of arsenic sulfide slag, the concentration of arsenic is 25g / L, measure 500mL into a three-necked flask, put it into a magnetic rotor, and put it into a magnetic oil bath. According to the molar ratio of iron to arsenic of 1.2, ferrous sulfate was weighed to prepare a solution, and the constant volume was 125mL, and hydrogen peroxide was diluted to a mass concentration of 5%, and the ferrous sulfate solution and hydrogen peroxide were connected to a peristaltic pump. Weigh sodium carbonate, prepare a solution with a mass concentration of 30%, and adjust the pH. Connect the pH meter and ORP to the flask. Turn on stirring, adjust the initial pH value of the arsenic-containing waste liquid to 1.00 with sodium carbonate solution, set the temperature of the magnetic heating stirrer at 95°C, turn on the heating until the set temperature is reached, and co...

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Abstract

The invention discloses a long-term stabilization treatment method for arsenic in arsenic-containing waste liquid, which comprises the following steps: (1) mixing arsenic-containing waste liquid with ferrous sulfate solution, adjusting the pH, temperature and oxidation-reduction potential of the mixed liquid, and arsenic-precipitated products Washing and drying to obtain crystalline scorodite; (2) high-speed stirring and granulation of crystalline scorodite and silicon-acrylic emulsion to form primary coated particles with scorodite as the core and silicon-acrylic emulsion as the shell. Press molding in a mold and dry to obtain scorodite core-shell-coated solidified body body; (3) Soak the solidified body body in step (2) in silicon-acrylic emulsion, take it out and dry it, and finally obtain arsenic-containing minerals cured body. The arsenic-containing solidified body obtained by the method has high density, high arsenic content, low arsenic leaching toxicity and good long-term stability.

Description

technical field [0001] The invention belongs to the field of harmless disposal of arsenic-containing hazardous waste, and in particular relates to a long-term stabilization treatment method for arsenic-containing waste liquid arsenic. [0002] technical background [0003] The harmless disposal of arsenic-containing hazardous waste has always been an environmental protection issue of widespread concern at home and abroad. Arsenic-containing hazardous waste includes arsenic-containing waste liquid, arsenic-containing waste residue, etc., and arsenic-containing waste residue is produced by the treatment of arsenic-containing waste liquid. Therefore, in the final analysis , the harmless disposal of arsenic-containing waste liquid arsenic is an important research direction to solve the source of arsenic pollution. At present, the existing arsenic-containing waste liquid arsenic treatment methods mainly include resource recovery and harmless disposal. Resource recovery is mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00B01J13/04
CPCC01G49/00B01J13/04
Inventor 蒋国民闫国孟王克勇刘永丰孟云高伟荣
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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