Chromium residue wet detoxication processing method

A technology of wet detoxification and treatment method, which is applied in the direction of protection devices against harmful chemical agents, etc., which can solve the problems of difficult filtration, large acid consumption, and high treatment cost, and achieve the effect of reducing costs and ensuring the effect of detoxification

Inactive Publication Date: 2011-10-12
SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing treatment methods mainly include: one is to convert hexavalent chromium into trivalent chromium by fire method, but its disadvantages are high cost and easy to cause secondary pollution; the other is wet method, adding acid to make the water-soluble chromium in the slag and Acid-soluble chromium is dissolved in aqueous solution for solid-liquid separation, and barium chloride is added to the filtrate to make chrome yellow, but the disadvantages are large acid consumption, difficult filtration and high treatment cost

Method used

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  • Chromium residue wet detoxication processing method
  • Chromium residue wet detoxication processing method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] At room temperature of 18°C, first add 5kg of chromium slag, 2.0kg of water and 120g of sodium bicarbonate into a ball mill and mill for 40 minutes, then add 4.0kg of water to adjust the concentration to 30% and pass through a 200-mesh sieve, and the slurry under the sieve reacts for 3 hours , into a plate and frame filter press with water washing for dehydration by pressing, washing with water for 10 minutes, and finally washing with saturated ferrous sulfate solution for 3 minutes. The hexavalent chromium content in the initial filtrate was detected to be 2452ppm. In 2007, the leaching solution prepared by the toxic leaching method of solid wastes measured 0.07ppm of hexavalent chromium and 0.1ppm of total chromium, meeting the standard requirements for general solid waste landfill in HJ / T301-2007 "Technical Specifications for Environmental Protection of Chromium Slag Pollution Control" .

Embodiment 2

[0024] At room temperature of 2°C, add 5kg of slag, 2.0kg of water and 120g of sodium bicarbonate into a ball mill and mill for 40 minutes, then add 4.0kg of water to adjust the concentration to 30% and pass through a 200-mesh sieve, and the slurry under the sieve reacts for 3 hours Enter the plate and frame filter press with water washing for dehydration and washing for 10 minutes, and finally wash with saturated barium chloride solution for 2 minutes. The hexavalent chromium content in the initial filtrate is 2273ppm, and the filter cake is solid according to HJ / T 299-2007 Toxic leaching method of waste leaching The leaching solution is prepared by measuring hexavalent chromium 0.06ppm, total chromium 0.1 ppm, and barium 25ppm, which meet the standard requirements of entering general solid waste landfill in HJ / T301-2007 "Technical Specifications for Environmental Protection of Chromium Slag Pollution Control" .

Embodiment 3

[0026] At room temperature of 2°C, add 5kg of slag, 2.0kg of water and 120g of sodium carbonate into a ball mill and mill for 40 minutes, then add 4.0kg of water to adjust the concentration to 30% and pass through a 200-mesh sieve. The slurry under the sieve reacts for 3 hours before entering The plate and frame filter press with water washing is used for dehydration and washing for 10 minutes, and finally washed with saturated ferrous sulfate solution for 3 minutes. The hexavalent chromium content in the initial filtrate is 2268ppm, and the filter cake is solid waste according to HJ / T 299-2007 Leaching Toxicity Leaching method The leaching solution was prepared to measure 0.06ppm of hexavalent chromium and 0.09ppm of total chromium, meeting the standard requirements for entering general solid waste landfill in HJ / T301-2007 "Technical Specifications for Environmental Protection of Chromium Slag Pollution Control".

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Abstract

The invention discloses a chromium residue wet detoxication processing method which comprises the following steps: (1) using water to perform wet ball-milling on a chromium residue at a normal temperature; meanwhile, adding a soluble carobonat or a bicarbonate or a carbon dioxide which is 0.1-15wt% of the chromium residue; (2) carrying out fine particle and coarse particle separation on the residue liquid after the ball-milling by virtue of a hydrocyclone, repeatedly performing the ball-milling on the coarse particles with particle size more than 74 microns, and putting the fine particles with the particle size less than 74 microns in a reaction tank; and (3) reacting for 3-24 hours, performing the solid-liquid separation by using a plate-and-frame filter press with a rinsing function, rinsing repeatedly, adding barium chloride or lead acetate and lead nitrate into the filtrate to produce a chrome yellow, and adding a barium chloride or a ferrous solution sulfate in trace hexavalent chromium remained in a filter cake. Compared with the prior art, the chromium residue detoxication processing method has the obvious advantages and effects that a produced carbonate ion can be used for replacing an indissolvable chromate ion in the chromium residue so as to promote the indissolvable hexavalent chromium in the residue to be completely dissolved in a water solution without using acid; not only can the cost be reduced, but also the subsequent filter difficulty is not increased; and the content of the hexavalent chromium in the final residue is very low, and the detoxication effect is guaranteed.

Description

【Technical field】 [0001] The invention relates to a wet detoxification treatment method for chromium slag. 【Background technique】 [0002] The waste residue discharged from the production of chromium salts contains water-soluble hexavalent chromium, which is recognized as a strong carcinogen. The existing treatment methods mainly include: one is to convert hexavalent chromium into trivalent chromium by fire method, but its disadvantages are high cost and easy to cause secondary pollution; the other is wet method, adding acid to make the water-soluble chromium in the slag and Acid-soluble chromium is dissolved in aqueous solution for solid-liquid separation, and barium chloride is added to the filtrate to make chrome yellow, but the disadvantages are large acid consumption, difficult filtration and high treatment cost. 【Content of invention】 [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned existing chromium slag treatment...

Claims

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Application Information

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IPC IPC(8): A62D3/37A62D3/33
Inventor 陈嘉愉李朝晖候继国蔺加强
Owner SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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