Stabilizing method of arsenic-containing waste residues

A technology of waste residue and aluminum salt, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of unsatisfactory stabilization effect of arsenic-containing waste residue, avoid secondary pollution, avoid re-release, The effect of improving stability

Active Publication Date: 2018-06-22
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating technology of inorganic materials in the prior art is still unsatisfactory for the stabilization effe

Method used

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  • Stabilizing method of arsenic-containing waste residues
  • Stabilizing method of arsenic-containing waste residues
  • Stabilizing method of arsenic-containing waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Scorod slag (crystalline ferric arsenate): containing 33wt.% of As, 23wt.% of iron and the rest of hydrogen and oxygen. Mix 20g of sororid slag with 100ml of water to obtain a mixed slurry of scorodil slag , Add 20mL of aluminum sulfate solution and 20mL of sodium silicate solution dropwise into scorodite slag mixed slurry under mechanical stirring, wherein the molar ratio of aluminum in aluminum sulfate solution to silicon in sodium silicate is 0.6:1, and silicic acid The molar ratio of silicon in sodium solution to arsenic in scorodite slag is 1:1. After the dropwise addition, the metathesis reaction was continued for 3 hours, and the pH value of the micro-coating process was always controlled within the range of 2-5 by acid or alkali.

[0059] Detect the arsenic content in the slurry in the micro-coating process (As content detection method is: use potassium borohydride test reagent to measure by atomic fluorescence spectrometer, and perform single-point calibration ...

Embodiment 2

[0065] Scoord slag (crystalline ferric arsenate): content of As: 33wt.%, scorodid slag 20g and 100ml water are mixed to obtain scorodil slag mixed slurry, aluminum sulfate solution and silicic acid are mixed under mechanical stirring The sodium solution is added dropwise to the mixed slurry of scorodonite slag at the same time, wherein the molar ratio of aluminum in the aluminum sulfate solution to silicon in the sodium silicate is 0.5:1, and the molar ratio of silicon in the sodium silicate solution to arsenic in the scorodonite slag is It is 2:1. The pH value of the micro-coating process is always controlled within the range of 2-5 by using acid or alkali. After the dropwise addition, the metathesis reaction was continued for 3 hours, and solid-liquid separation was carried out to obtain the filtrate and scorodite waste residue treated with micro-coating stabilization.

[0066] According to the method in Example 1, the arsenic concentration of the slurry in the micro-coatin...

Embodiment 3

[0073] Scorodor slag (crystalline ferric arsenate): content of As: 33wt.%. Under mechanical stirring, adjust the mixed solution of aluminum sulfate solution and sodium silicate solution to a pH of 3 to 5 to form a mixed slurry of aluminum silicate composite material, and add scorodite slag to the mixed slurry, and the aluminum sulfate solution The molar ratio of silicon in aluminum and sodium silicate is 0.6:1, and the molar ratio of silicon in sodium silicate solution and arsenic in scorodite slag is 1.5:1. The pH value of the micro-coating process is always controlled within the range of 3-5 by using acid or alkali. After the dropwise addition, the metathesis reaction was continued for 3 hours, and solid-liquid separation was carried out to obtain the filtrate and scorodite waste residue treated with micro-coating stabilization.

[0074] According to the method in Example 1, the arsenic concentration of the micro-coating process liquid was detected, and the arsenic concentr...

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Abstract

The invention provides a stabilizing method of arsenic-containing waste residues. The stabilizing method comprises the steps that the arsenic-containing waste residues, a water soluble silicate, watersoluble aluminum salt and water are mixed and undergo a replacement reaction, wherein the pH in the replacement reaction is 2-11. The arsenic-containing waste residues, the silicate, the aluminum salt and the water are mixed under the condition of the appropriate pH and undergo the replacement reaction, and the silicate reacts with the aluminum salt to produce a silicon-aluminum composite coatingthe surfaces of the arsenic-containing waste residues, so that the arsenic-containing waste residues are isolated from the external environment, the stability of the arsenic-containing waste residuesis further improved, and arsenic is prevented from being released again. What is proven by the results of the embodiment is that with the adoption of the stabilizing method, the silicon-aluminum composite coats the surfaces of the arsenic-containing waste residues, the arsenic-containing waste residues are still prevented from further releasing the arsenic to the environment through a 10-day leaching stability test well, and secondary pollution to the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of arsenic-containing waste residue treatment, in particular to a method for stabilizing arsenic-containing waste residue. Background technique [0002] In the production process of metallurgical industry and chemical industry, a large amount of arsenic-containing waste liquid will be produced, and arsenic is a toxic element, and arsenic-containing waste liquid needs to be de-arsenized. Nowadays, the commonly used methods for solution arsenic removal include sulfide precipitation, iron-arsenic co-precipitation and scorodite precipitation, resulting in a series of arsenic-containing waste residues such as arsenic sulfide slag, iron-arsenic co-precipitation slag or scorodite slag. To achieve the removal of arsenic in the solution. Different arsenic-containing waste residues are only stable under specific conditions, and changes in the acidity of storage and landfill sites will lead to a large amount of arseni...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/20
Inventor 贾永锋段伊行王少锋马旭
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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