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Chromium slag detoxification method

A technology for chromium slag and slag slurry, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high cost, inability to completely solve the detoxification of chrome slag, etc. , the effect of simple operation

Active Publication Date: 2021-11-12
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for detoxification of chromium slag to solve the problems of high cost and inability to completely solve the problem of detoxification of chromium slag in the prior art

Method used

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  • Chromium slag detoxification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Chromium slag composition: the proportion of each component in chromium slag SiO 2 : 58.92%; CaO: 26.92; MgO: 8.48%; Fe 2 o 3 : 5.64%; Al 2 o 3 : 12.42%; Cr 2 o 3 : 3.21%.

[0037] Detoxify the above chromium slag:

[0038] The above-mentioned chromium slag and water are mixed and put into a ball mill for grinding treatment, and a solubilizing agent sodium bicarbonate is added at the same time of the grinding treatment to obtain a slurry. Among them, the weight ratio of chromium slag to water is 3:7; the dosage of solubilizer is 0.8% of the weight of chromium slag; the grinding fineness of the slurry is 200 mesh.

[0039] The above slurry is added to the buffer tank for buffer treatment, and then the slurry is separated and screened through a cyclone. Put the slurry with a particle size of ≤200 mesh into the thickening tank for soaking, and soak for 8 hours to obtain the leachate and soaking residue; return the slurry with a particle size of >200 mesh to the bal...

Embodiment 2

[0043] The difference from Example 1 is only that the dosage of the solubilizing agent is 1.5% of the weight of the chromium slag. The chromium ion leaching rate is 88.5%.

Embodiment 3

[0045] The only difference from Example 1 is that the weight ratio of water and slurry in the thickening tank is 70:3. Chromium ion leaching rate is 82.5%.

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Abstract

The invention provides a chromium slag detoxification method. The method comprises the following steps: S1, mixing and grinding chromium slag and water, adding a solubilizer while grinding is conducted, and obtaining slag slurry; S2, separating and screening the slag slurry; S3, adding the slag slurry with the particle size smaller than or equal to 200 meshes into a thickening pool to be soaked, and obtaining leachate and soaked slag; S4, adding the leachate into a leachate detoxification pool for first stabilization treatment, and obtaining a precipitation product; S5, adding the soaked residues and a precipitation product into a residue slurry detoxification tank, and carrying out second stabilization treatment, wherein the solubilizer is sodium carbonate and / or sodium bicarbonate. By means of the operation, acid does not need to be added, hexavalent chromium does not need to be reduced into trivalent chromium, the problem that trivalent chromium is oxidized into hexavalent chromium again subsequently is avoided, a stable non-toxic hexavalent chromium product can be generated on the basis of low cost, and the problem of chromium slag detoxification is thoroughly solved. Moreover, the detoxification method disclosed by the invention is shorter in process and simpler to operate.

Description

technical field [0001] The invention relates to the technical field of chromium slag detoxification, in particular to a chromium slag detoxification method. Background technique [0002] The existing chromium slag wet detoxification method is to add waste acid after the chromium slag is ground, dissolve hexavalent chromium in the acid solution as much as possible, then add a reducing agent to reduce hexavalent chromium to trivalent chromium, and then Trivalent chromium stabilizes the precipitation and makes it harmless. Patent CN101816829A (a chromium slag detoxification process) grinds chromium slag, carries out acid leaching reduction reaction, and then performs solid-liquid separation to obtain detoxified chromium slag. Patent CN102614620B (an alkaline hexavalent chromium-containing waste residue wet detoxification method) adjusts the pH between 7-10 after slurrying the chromium slag, and then adds a stabilizer and a reducing agent to reduce the hexavalent chromium to tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43Y02P10/20
Inventor 赵发敏姚建明刘杰高术杰刘霞李兴杰
Owner CHINA ENFI ENGINEERING CORPORATION
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