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Treatment method for detoxifying and recycling chromium slag

A treatment method and technology of chromium slag, which is applied in the field of environmental pollution control, can solve the problems of complex recycling, incomplete reduction, and high recycling costs, and achieve a large amount of leaching liquid, which is conducive to subsequent recycling and low equipment construction costs. Effect

Active Publication Date: 2012-08-01
武汉巍川环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above method, the recovery and utilization of chromium is more complicated, the recovery cost is higher, and the reduction is not complete
If the waste residue containing chromium (III) after treatment is discharged or landfilled, it will also cause pollution to the environment in the long run

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The processing method of chromium slag detoxification recycling, it comprises the steps:

[0040] 1) First, take a sample and analyze the main component content (the main component is chromium content), acidity and particle size in the chromium (VI) waste residue:

[0041] After analyzing a waste residue containing chromium (VI), the content of chromium (VI) on a dry basis is 2.6wt%, the content of insoluble silicate and aluminosilicate is 83wt%, and the oxyacids of acid-soluble iron, sodium, magnesium and calcium The contents of salts, oxides and hydroxides are between 0.5 and 5 wt%, and the contents of other elements are all less than 0.1 wt%. The acidity is PH=6.5. The content of large particles above 20 mesh is 8wt%, and the maximum particle diameter is about 1.5cm. The average water content of chrome slag is 19wt%.

[0042] 2) Build four with a volume of 500m 3 A special leaching tank (cement pool), and a movable spray pipe is built above the leaching tank. Eac...

Embodiment 2

[0066] The processing method of chromium slag detoxification recycling, it comprises the steps:

[0067] 1) Sampling and analysis of main component content (main component is chromium content), acidity and particle size in the waste residue containing chromium (VI) at first;

[0068] After analyzing a waste residue containing chromium (VI), the content of chromium (VI) on a dry basis is 3.2wt%, the content of insoluble silicate and aluminosilicate is 83wt%, and the oxyacids of acid-soluble iron, sodium, magnesium, and calcium The contents of salts, oxides and hydroxides are between 0.5 and 5 wt%, and the contents of other elements are all less than 0.1 wt%. The acidity is PH=6.5. The content of large particles above 20 mesh is 8wt%, and the maximum particle diameter is about 1.5cm. The average water content of chrome slag is 19wt%.

[0069] 2) Build 3 leaching tanks (and do anti-seepage treatment), build a movable spray pipe above the leaching tank, and set a leaching liquid...

Embodiment 3

[0077] Embodiment 3 (build 6 leaching ponds):

[0078] The processing method of chromium slag detoxification recycling, it comprises the steps:

[0079] 1) Sampling and analysis of main component content (main component is chromium content), acidity and particle size in the waste residue containing chromium (VI) at first;

[0080] After analyzing a waste residue containing chromium (VI), the content of chromium (VI) on a dry basis is 1.8wt%, the content of insoluble silicate and aluminosilicate is 83wt%, and the oxyacids of acid-soluble iron, sodium, magnesium, and calcium The contents of salts, oxides and hydroxides are between 0.5 and 5 wt%, and the contents of other elements are all less than 0.1 wt%. The acidity is PH=13.0. The content of large particles above 20 mesh is 8wt%, and the maximum particle diameter is about 10cm. The average water content of chrome slag is 19wt%.

[0081] 2) Build 6 leaching tanks (and do anti-seepage treatment), build a movable spray pipe a...

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Abstract

The invention relates to a treatment method for detoxifying chromium-containing (VI) waste slag and recycling chromium (VI). The treatment method for detoxifying and recycling the chromium slag is characterized by comprising the following steps of: 1) sampling and analyzing content, acidity and particle diameter of main components in the chromium-containing waste slag; 2) establishing 3 to 6 leaching tanks; 3) piling the chromium-containing waste slag with the particle diameter of less than or equal to 20 meshes in the leaching tanks; 4) preparing 0.01 to 1 weight percent dilute acid; 5) spraying the dilute acid to the chromium-containing waste slag in the No. 1 leaching tank through a spray pipe, spraying the leachate in the No. 1 leaching tank to the No. 2 leaching tank, spraying the leachate in the No. 2 leaching tank to the No. 3 leaching tank, and so on, collecting the leachate in the last leaching tank, and entering the next procedure; and 6), regulating the pH of the collected leachate to 1.5-2 by using 10 weight percent dilute sulfuric acid, filtering, performing countercurrent multistage extraction-back extraction concentration, and thus obtaining 20 to 30 weight percent chromium-containing concentrate. The method is low in cost and environment-friendly, and can be used for recovering chromium.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and in particular relates to a treatment method for detoxifying waste residue containing chromium (VI) and recycling chromium (VI). Background technique [0002] During the production of chromium salts, waste residues containing highly toxic chromium (VI) are generated. Due to historical reasons, a large amount of waste residue containing chromium (VI) has not been effectively disposed of. Chromium (VI) is one of the highly toxic elements, direct discharge will cause serious pollution to the environment, human contact or ingestion will cause skin ulcers, respiratory inflammation, anemia, neuritis and other serious injuries, it is also one of the known carcinogens . [0003] At present, the harmless treatment of waste residue containing chromium (VI) is mainly to reduce the highly toxic chromium (VI) to less toxic chromium (III) or metallic chromium (0). The methods used mainly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/06C22B3/26C22B34/32A62D3/00
CPCY02P10/20
Inventor 宋乐山郑碧锦陈胜
Owner 武汉巍川环保科技有限责任公司
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