Harmless arsenic solidifying method for industrial wastewater containing arsenic

A wastewater and industrial technology, applied in the field of arsenic pollution control, can solve problems such as complicated processes, and achieve the effects of simple process flow, high arsenic removal and arsenic fixation efficiency

Pending Publication Date: 2019-05-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patents with application numbers 201610744278.9 and 201810065414.0 respectively disclose the stable solidification method of amorphous ferric arsenate, which can solidify the hazardous waste ferric arsenate slag at an effective temperature, but the secondary waste water and waste slag generated in the process need to be properly treated, and the process is cumbersome

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Effect test

Embodiment 1

[0026] A method for mineralizing and fixing arsenic in industrial arsenic-containing wastewater, the specific steps are as follows:

[0027] (1) Add 100L of industrial arsenic-containing wastewater (concentration of main substances: arsenic 8.5g / L, sulfuric acid 1.0 g / L) into the reaction tank with stirring device, and continuously add limestone until the pH of the reaction system is 10 ; After the reaction, the reaction slurry was allowed to stand for stratification to obtain 96L of neutralized liquid.

[0028] (2) Add 12.6kg of ferrous sulfate and 5.5L of hydrogen peroxide to the 96L of neutralized solution in step (1) according to the molar ratio of iron to arsenic of 4:1, to carry out deep arsenic removal, and continuously add limestone during the process to maintain The pH of the reaction system is 6; when the arsenic content in the reaction system is less than 0.5 mg / L, the reaction slurry is subjected to liquid-solid separation to obtain 2.8 kg of iron arsenate arsenic ...

Embodiment 2

[0032] A method for mineralizing and fixing arsenic in industrial arsenic-containing wastewater, the specific steps are as follows:

[0033] (1) Add 100L of industrial arsenic-containing wastewater (concentration of main substances: arsenic 15g / L, sulfuric acid 40g / L) into a reaction tank with a stirring device, and continuously add slaked lime until the pH of the reaction system is 8; After the end, the reaction slurry was left to stand for stratification to obtain 90L of neutralized liquid.

[0034] (2) According to the molar ratio of iron and arsenic as 6:1, add 2.4kg of ferric sulfate and bleaching powder to the 90L neutralized liquid in step (1) to remove arsenic in depth, and continuously add slaked lime during the process to maintain the stability of the reaction system. The pH is 5; when the arsenic content in the reaction system is less than 0.5mg / L, the reaction slurry is subjected to liquid-solid separation to obtain 6.3kg of iron arsenate arsenic precipitation slag...

Embodiment 3

[0038] A method for mineralizing and fixing arsenic in industrial arsenic-containing wastewater, the specific steps are as follows:

[0039] (1) Add 100L of industrial arsenic-containing wastewater (concentration of main substances: arsenic 1g / L, sulfuric acid 80g / L) into a reaction tank with a stirring device, and continuously add quicklime and slaked lime until the pH of the reaction system is 9 ; After the reaction, the reaction slurry was left to stand for stratification to obtain 84L of neutralized liquid.

[0040] (2) According to the molar ratio of iron to arsenic of 2:1, add 0.45 kg of ferric chloride to the 84 L of neutralized liquid in step (1) and pass in air to carry out deep arsenic removal. During the process, quicklime and Slaked lime keeps the pH of the reaction system at 8; when the arsenic content in the reaction system is less than 0.5 mg / L, the reaction slurry is subjected to liquid-solid separation to obtain 0.4 kg of iron arsenate arsenic precipitation sl...

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Abstract

The invention discloses a harmless arsenic solidifying method for industrial wastewater containing arsenic, and belongs to the field of arsenic pollution control. The harmless arsenic solidifying method includes the steps: the industrial wastewater containing the arsenic is subjected to pre-neutralization treatment; iron salt and an oxidant are added to a solution after pre-neutralization to solidify the arsenic into iron arsenate precipitation arsenic slag, and a neutralizer is used for controlling the process pH; and the iron arsenate precipitation arsenic slag is transformed into scoroditestabilization slag in a high-temperature aqueous solution by high-temperature mineralization. According to the harmless arsenic solidifying method for the industrial wastewater containing arsenic, standardized discharge of the industrial wastewater containing the arsenic can be realized, meanwhile, the arsenic is solidified into the scorodite stabilization slag, the technological process is simple, and the efficiency of arsenic removing and solidifying is high.

Description

technical field [0001] The invention relates to a method for harmlessly fixing arsenic in industrial arsenic-containing wastewater, belonging to the field of arsenic pollution control. Background technique [0002] Arsenic is extremely toxic, bioaccumulative and carcinogenic. Arsenic exists in complex forms in nature, and is mostly associated with copper, gold, tin, nickel, cobalt and other non-ferrous metal mineral resources in the form of sulfide. According to statistics, up to 100,000 tons of arsenic enters the non-ferrous metal smelting system with ore in my country every year, and is enriched in slag dust, causing serious safety and environmental risks. [0003] Due to the large output of arsenic-containing waste slag, the narrow utilization range of arsenic products, and the high toxicity of arsenic-containing compounds, stable solidification of arsenic in high-arsenic-containing materials and stockpiling in special slag yards is currently the main way to control "ars...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
Inventor 李存兄魏昶张鹏樊刚邓志敢李兴彬
Owner KUNMING UNIV OF SCI & TECH
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