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Biomass wet detoxification method of hexavalent chromium-contained waste residues

A wet detoxification and biomass technology, applied in the removal of solid waste and other directions, can solve the problems of high detoxification cost, small processing capacity, risk of detoxification effect, etc., and achieves low detoxification cost, reduced processing cost, and good industrial application prospects. Effect

Active Publication Date: 2015-02-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention aims to provide a wet detoxification method for treating waste residue containing hexavalent chromium by using cheap and easy-to-obtain biomass, which solves the problems of high detoxification cost and risk of detoxification effect existing in the existing method. Small quantity problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Slurry the chromium-containing waste residue containing 0.117% of hexavalent chromium in the slurry tank at 30°C for 3 hours (the liquid-solid ratio is 10:1), add a certain amount of hydrochloric acid to adjust the pH to 9.40; add orange peel to the slurry , the amount of orange peel added is 90% of the weight of the original chrome residue, and it is slurried at 50 ° C for 5 hours. After the reaction, the filtered chromium slag was tested for leaching toxicity. The concentration of hexavalent chromium in the leaching solution was 2.57 mg / L, basically meeting the landfill standard for general solid waste.

Embodiment 2

[0048] Slurry the chromium-containing waste residue containing 0.135% hexavalent chromium in the slurry tank at 50°C for 2 hours (the liquid-solid ratio is 5:1), add a certain amount of nitric acid to adjust the pH to 9.23; add orange peel to the slurry , the amount of orange peel added is 60% of the weight of the original chromium slag, and it is treated at 70°C for 3h. After the reaction, the filtered chromium slag was tested for leaching toxicity. The hexavalent chromium concentration in the leaching solution was 1.74 mg / L, which met the landfill standard for general solid waste.

Embodiment 3

[0050] Slurry the chromium-containing waste residue containing 0.179% hexavalent chromium in a slurry tank at 85°C for 2 hours (liquid-solid ratio is 5:1), add a certain amount of nitric acid to adjust the pH to 9.23; add banana peel to the slurry , the amount of banana peel added is 30% of the weight of the original chromium slag, and it is treated at 85°C for 1h. After the reaction, the filtered chromium slag was tested for leaching toxicity. The concentration of hexavalent chromium in the leaching solution was 2.34 mg / L, which met the landfill standard for general solid waste.

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Abstract

The invention relates to a biomass wet detoxification method of hexavalent chromium-contained waste residues. The method comprises the following steps: (1) chromium residues are pulpified to slurry; (2) the pH of the slurry is adjusted to 7.0-10.0; (3) after the slurry is heated, the slurry is added in biomasses for stirring and pulpifying; and (4) the slurry is filtered to obtain the qualified chromium residues with standard content of hexavalent chromium. The chromium residues obtained by the treatment method accord with the leaching toxicity [Cr(VI)] not more than 3 mg / L stated by the chromium residue pollution environmental protection technical specifications (HJ / T301-2007), also accord with the leaching toxicity [Cr(VI)] not more than 2.5 mg / L stated by the hazardous waste landfill pollution control standards (GB18598-2001), and can be embedded as general industrial solid wastes. Raw materials used by the method are easily obtained biomasses with low cost, and are low in detoxification temperature and treatment cost; and the method is simple in flow, is suitable for industrial production, and has better industrial application foreground.

Description

technical field [0001] The invention relates to the technical field of clean production of chromium compounds, in particular to a chromium residue treatment method for direct detoxification of hexavalent chromium in chromium residue by biomass. Background technique [0002] Hexavalent chromium has strong toxicity and is a strong carcinogen, which invades the skin and respiratory tract, and induces acute and chronic toxicity, such as neurotoxicity, genetic toxicity, and immunotoxicity. Chromium slag is a dangerous solid waste that is difficult to treat and is discharged during the production of chromium compounds. It contains a certain amount of hexavalent chromium, has strong oxidation toxicity, and easily causes serious pollution to water and soil. The stacking of chromium slag has strong harm to the environment. Chromium slag pollution is a world environmental protection problem that has not been solved so far, making the chromium compound industry a heavy pollution indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 徐红彬胡东方张红玲张洋王天贵张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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