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Method for using carbon monoxide to detoxicate chromium residue

A carbon monoxide and chromium slag technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of large coal consumption, high detoxification cost, rising hexavalent chromium ions, etc., and achieve the effect of reducing the amount of coal and reducing the cost.

Active Publication Date: 2008-08-06
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

) If directly adding coal to chromium slag powder for dry detoxification, the added coal content is between 35.00% and 10.00%, the coal consumption is large, the cost of detoxification is high, and the hexavalent chromium ion (Cr 6+ ) content is as high as 100.00mg / L or more, which cannot meet the requirements of the "Technical Specifications for Environmental Protection of Chromium Slag Pollution Control" (HJ / T301-2007) promulgated by the State Environmental Protection Administration
If wet detoxification is used, the insoluble hexavalent chromium ions (CaCrO 4 ) cannot be completely reduced to trivalent chromium ions (Cr 3+ ), after one year of stockpiling, hexavalent chromium ions (Cr 6+ ) content will rise to more than 20.00mg / L, which also fails to meet the requirements of the "Technical Specifications for Environmental Protection of Chromium Slag Pollution Control" (HJ / T301-2007) promulgated by the State Environmental Protection Administration

Method used

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  • Method for using carbon monoxide to detoxicate chromium residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for detoxifying chromium slag with CO: comprises the following steps:

[0019] (1) Abrasives: chromium slag [solid, containing hexavalent chromium ions (Cr 6+ ) is about 1.0% or more] After adding water, wet grind into slurry; dry coal into coal powder; measure and mix according to the ratio of chromium slag: water = 1:5 by weight, and then use ball mill for wet ball milling, the fineness of slurry It is controlled at about 150 mesh, and the slurry is directly suction-filtered by a vacuum belt filter, and part of the hexavalent chromium ions (Cr 6+ ), recovered hexavalent chromium ions (Cr 6+ ) of the filtrate is returned to the red alum sodium production process for recycling; the filtered chromium slag also contains a large amount of hexavalent chromium ions (Cr 6+ ), the following steps are to filter hexavalent chromium ions (Cr 6+ ) detoxification treatment;

[0020] (2) Drying: filter the chromium slag and water to separate the chromium slag from the...

Embodiment 2

[0027] The method for detoxifying chromium slag with carbon monoxide: comprise the following steps:

[0028] (1) Abrasives: chromium slag [solid, containing hexavalent chromium ions (Cr 6+ ) is about 1.0% or more] After adding water, wet grind into slurry; dry coal into coal powder; measure and mix according to the ratio of chromium slag: water = 1:3 by weight, and then use a ball mill for wet ball milling, the fineness of the slurry It is controlled at about 100 mesh, and the slurry is directly filtered by a vacuum belt filter to recover part of the hexavalent chromium ion (Cr 6+ ), recovered hexavalent chromium ions (Cr 6+ ) of the filtrate is returned to the red alum sodium production process for recycling; the filtered chromium slag also contains a large amount of hexavalent chromium ions (Cr 6+ ), the following steps are to filter hexavalent chromium ions (Cr 6+ ) detoxification treatment;

[0029] (2) Drying: filter the chromium slag and water to separate the chromiu...

Embodiment 3

[0036] The method for detoxifying chromium slag with carbon monoxide: comprise the following steps:

[0037] (1) Abrasives: chromium slag [solid, containing hexavalent chromium ions (Cr 6+ ) is about 1.0% or more] After adding water, wet grind into slurry; dry coal into coal powder; measure and mix according to the ratio of chromium slag: water = 1:1 by weight, and then use a ball mill for wet ball milling, the fineness of the slurry It is controlled at about 120 mesh, and the slurry is directly filtered by a vacuum belt filter, and part of the hexavalent chromium ions (Cr 6+ ), recovered hexavalent chromium ions (Cr 6+ ) of the filtrate is returned to the red alum sodium production process for recycling; the filtered chromium slag also contains a large amount of hexavalent chromium ions (Cr 6+ ), the following steps are to filter hexavalent chromium ions (Cr 6+ ) detoxification treatment;

[0038] (2) Drying: filter the chromium slag and water to separate the chromium sla...

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Abstract

The invention relates to a method by using carbon monoxide to detoxify chromium slag which belongs to the technical field in which hexavalent chromium ion Cr<6+> producing sodium bichromate chromium slag is reduced into trivalent chromium ion Cr<3+>. In order to ensure the mixture of chromium slag and coal to produce more CO in high temperature to reduce the hexavalent chromium ion Cr<6+> in the chromium slag into chromium ion Cr<3+>, the chromium slag and the coal are squeezed into chromium slag coal compact with density of 1.5*10<3> to 5.5*10<3>Kg / m<3>, and thickness of 5 to 50mm to calcinate, and ethanol solution is used for water quenching after calcinations. The method includes the following steps: grinding materials, drying, mixing chromium slag powder and coal powder to get a mixture with 91 percent to 98 percent of chromium slag powder and 2 percent to 9 percent of coal powder, squeezing the chromium slag and the coal into chromium slag coal compact, calcinating and water quenching by ethanol solution. The leaching solution of the chromium slag coal compact after being water quenched according to national standards has Cr<6+> with the content of 0.01 to 0.30mg / L, and is in accordance with the requirement of HJ / T301-2007 issued by national environmental protection headquarter.

Description

technical field [0001] The present invention belongs to the hexavalent chromium ion (Cr 6+ ) reduced to trivalent chromium ion (Cr 3+ ) technical field, especially relate to the production of harmful hexavalent chromium ions (Cr 6+ ) is reduced to pollution-free trivalent chromium ions (Cr 3+ )Technology. Background technique [0002] Chromium salt is a widely used industrial raw material, but the production of one ton of sodium red vitriol (Na 2 Cr 2 o 7 2H 2 O) 2 to 3 tons of harmful hexavalent chromium ions (Cr 6+ ) chromium slag, so the chromium slag discharged by some domestic chromium salt factories piles up like a mountain, occupying a large area of ​​land. The more serious problem is that the chromium slag contains toxic substances - hexavalent chromium ions (Cr 6+ ) cause environmental pollution. Through chemical analysis, it is known that the hexavalent chromium ion (Cr 6+ ) content up to 1.5%, the long-term stacking of this c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/37A62D3/40A62D101/43
Inventor 李先荣王亭刚马顺友叶明光郭义祥
Owner SICHUAN YINHE CHEM
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