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Technics for expelling poison for chromic slag

A treatment process and technology for chromium slag, applied in the field of chromium slag detoxification treatment technology, can solve the problems of inability to utilize chromium slag in large quantities, low degree of automation, large floor space, etc., achieve good detoxification effect, reduce equipment investment, reduce The effect of governance costs

Active Publication Date: 2008-01-30
SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a relatively reliable detoxification effect, but since the pulverized material should be soaked in clean water for more than 24 hours, and then undergoes a second solid-liquid separation and stepless spray washing, the process is long, the floor area is large, the water consumption is large, and the production scale Small, large investment, low degree of automation
However, the market sales of cement bricks made of detoxified chromium slag have certain limitations, and the detoxified chromium slag cannot be used in large quantities.

Method used

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  • Technics for expelling poison for chromic slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, dissolve and dilute the barium chloride with water to form a solution, and dissolve and dilute the barium carbonate to form a suspension, and simultaneously enter the ball mill for mixed grinding with the chromium slag with a water content of 25%. Chromium slag enters the ball mill through the feeder and belt conveyor. When the chromium slag, the solution and the suspension collide with the iron balls of the ball mill in the ball mill to crush the chromium slag, the hexavalent chromium in the chromium slag is continuously dissolved during the collision crushing process and fully contacts with the barium ions in the solution. Rapid reaction, pulverization, ball milling, and dissolution to generate water-insoluble barium chromate.

[0017] All the materials after the ball milling reaction are sieved through a 300 mesh / inch grading sieve, and the materials with a moisture content of 85% through the grading sieve enter the radial flow thickener for material concentra...

Embodiment 2

[0020] The difference from Example 1 is that the barium chloride is firstly dissolved and diluted with water to form a solution, and the barium carbonate is dissolved and diluted to form a suspension, and the chromium slag with a water content of 21% enters the ball mill for mixed grinding. The materials after the ball milling reaction are all sieved through a 200 mesh / inch grading sieve, the moisture content of the material passing through the grading sieve is 83%, and the thickened material is a slurry with a moisture content of 48%. Add an appropriate amount of ferrous sulfate to the slurry in the quality control adjustment mixing tank. The water content of the treated filter residue was 33%.

Embodiment 3

[0022] The difference from Example 1 is that the barium chloride is firstly dissolved and diluted with water to form a solution, and the barium carbonate is dissolved and diluted to form a suspension, and the chromium slag with a water content of 18% enters the ball mill for mixed grinding. The materials after the ball milling reaction are all sieved through a grading sieve of 120 mesh / inch, the moisture content of the material passing through the grading sieve is 80%, and the thickened material is a slurry with a moisture content of 45%. The water content of the filter residue after treatment is 30%.

[0023] Beneficial effect

[0024] In the roadbed stabilized soil production test of Examples 1, 2, and 3, press 71kg of filter residue, 50kg of river sand, 6.5kg of lime, and 10.5kg of cement, mix and stir evenly, and press it into a cube with a thickness of 30cm. After 7 days, test Its compressive strength is more than 5Mpa, compactness CBR is more than 96%, and the hexavalen...

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Abstract

The invention relates to a chrome slag decontamination process. The process is characterized in that the barium chloride is dissolved and diluted into solution by water, barium carbonate is dissolved and diluted into suspension, which is put into a ball mill with the chrome slag for mixing grinding; when mixing grinding, the chrome slag is crushed; the hexavalent chromium in the chrome slag is continuously dissolved in the crushing process and is reacted with the barium ion to create the barium chromate not dissolved in the water. The invention has the advantages of short disposal process, simple process, good decontamination effect, large industrialization scale, high automation of production pipeline, trivalence chromium in the chrome slag after disposal not easy to be reverted into hexavalent chromium and the chrome slag after disposal mixed with the cement, lime and sand stone used for the stabilization soil of the earthwork.

Description

technical field [0001] The invention relates to a chromium slag detoxification treatment process. 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, and hexavalent chromium is extremely permeable, causing serious pollution to the environment by penetrating soil, groundwater, and rivers. The existing treatment methods mostly use the reduction of hexavalent chromium to trivalent chromium, but under natural conditions, the reduced trivalent chromium will be oxidized to hexavalent chromium by the oxidation of oxygen in the air, which cannot be completely detoxified. Application number is 98113225.1, and the treatment method disclosed in the Chinese patent titled “Comprehensive Utilization of Chromium Slag Water Dissolved Poison” is: crush the chromium slag with water wet method and soak it in clear water for more than 24 hours, stir regularly, and...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/43
Inventor 钟环声秦武
Owner SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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