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Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues

A technology of chromium slag and chromium waste slag, applied in the direction of solid waste removal, sustainable waste treatment, solid waste management, etc., can solve the problems of wasting landfill storage site construction costs, occupying land resources, surrounding environmental pollution, etc.

Inactive Publication Date: 2015-02-04
刘杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention aims at the problem that the hexavalent chromium in the chromium slag will cause serious pollution to the surrounding environment, and that the storage or landfill after detoxification treatment will still occupy a large amount of land resources for a long time, which wastes the construction cost of the landfill storage site, and provides a A kind of chromium slag detoxification method and comprehensive utilization of chromium slag after detoxification

Method used

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  • Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues

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Effect test

Embodiment 1

[0032] After the waste slag containing chromium is milled into 150 mesh chromium slag powder by wet ball milling, water is added to the chromium slag powder to make chromium slag slurry, and the weight percentage concentration of the chromium slag slurry is 20%; in the chromium slag material Add hydrochloric acid in the slurry to make chromium slag slurry solution, control the pH value of chromium slag slurry solution to 5, fully stir chromium slag slurry solution simultaneously, make chromium slag slurry soak in hydrochloric acid; Adding the ferrous sulfate solution that is 25% by weight percentage concentration in the chromium slag slurry solution after soaking does not exist in the chromium slag slurry solution after soaking; After aging for 4 hours, the solid-liquid separation is carried out, and the water content of the filter residue obtained after the solid-liquid separation is controlled to be less than 20%. Finally, the filter residue is dried and crushed to obtain det...

Embodiment 2

[0034] After the waste slag containing chromium is milled into 200-mesh chromium slag powder by wet ball milling, water is added to the chromium slag powder to make chromium slag slurry, and the weight percentage concentration of the chromium slag slurry is 25%; in the chromium slag material Add sulfuric acid in the slurry to make chromium slag slurry solution, control the pH value of the chromium slag slurry solution to 5.5, and fully stir the chromium slag slurry solution at the same time, so that the chromium slag slurry is soaked in sulfuric acid; Adding the sodium sulfite solution with a weight percentage concentration of 30% in the final chromium slag slurry solution until no hexavalent chromium exists in the chromium slag slurry solution after soaking; The solid-liquid separation is carried out, and the moisture content of the filter residue obtained after the solid-liquid separation is controlled to be less than 20%. Finally, the filter residue is dried and crushed to o...

Embodiment 3

[0036]After the waste slag containing chromium is milled into 250 mesh chromium slag powder by wet ball milling, water is added to the chromium slag powder to make chromium slag slurry, and the weight percentage concentration of the chromium slag slurry is 30%; in the chromium slag material Add hydrochloric acid in the slurry to make chromium slag slurry solution, control the pH value of chromium slag slurry solution to 5, fully stir chromium slag slurry solution simultaneously, make chromium slag slurry soak in hydrochloric acid; Adding weight percent concentration in the chromium slag slurry solution after adding is 35% sodium pyrosulfite solution until there is no hexavalent chromium in the chromium slag slurry solution after soaking; Hours of aging, followed by solid-liquid separation, controlling the water content of the filter residue obtained after solid-liquid separation to be less than 20%, and finally drying and crushing the filter residue to obtain detoxified chromiu...

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Abstract

The invention relates to a method for detoxicating chromium residues and the comprehensive utilization of the detoxicated chromium residues. The method for detoxicating the chromium residues comprises the following steps of: performing wet ball milling on chromium-containing waste residues to obtain chromium residue powder; adding water into the chromium residue powder to prepare chromium residue slurry; adding acid into the chromium residue slurry to prepare chromium residue slurry solution, and fully stirring the chromium residue slurry solution simultaneously to make the chromium residue slurry immersed in the acid; adding a reducing agent into the immersed chromium residue slurry solution until hexavalent chromium does not exist in the immersed chromium residue slurry solution; curing the chromium residue slurry solution without the hexavalent chromium, and performing solid-liquid separation; and drying and grinding filter residues to obtain the detoxicated chromium residues without the hexavalent chromium. By the method for detoxicating the chromium residues, various hexavalent chromium compounds contained in the chromium residues can be systematically and completely detoxicated and removed, the hexavalent chromium in various produced building material products is comprehensively utilized, and the content of extract is less than 0.1mg / L.

Description

technical field [0001] The invention relates to a method for detoxifying chromium slag and comprehensive utilization of chromium slag after detoxification. Background technique [0002] The chromium-containing waste residue produced in the chromium salt industrial production process contains a large amount of water-soluble and acid-soluble hexavalent chromium. With natural weathering and rain washing and leaching, the hexavalent chromium in the chromium residue will cause serious pollution to the surrounding environment. Even after detoxification and disposal, stockpiling or landfilling will still occupy a large amount of land resources for a long time, and waste the construction cost of landfilling stockpiles. Contents of the invention [0003] The invention aims at the problem that the hexavalent chromium in the chromium slag will cause serious pollution to the surrounding environment, and that the storage or landfill after detoxification treatment will still occupy a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C04B7/24C04B18/04
CPCY02P40/10Y02W30/91
Inventor 刘杰
Owner 刘杰
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