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Leaching/wet detoxification method for different chromium pollution media

A wet detoxification and chromium pollution technology, applied in the field of pollutant treatment, can solve the problems of low ball milling efficiency, particle size reduction, complicated operation, etc., and achieve the effects of reducing equipment investment, saving land, and ensuring the treatment effect.

Pending Publication Date: 2021-12-03
湖南新九方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Traditional chromium-contaminated plots are treated separately for different chromium-contaminated media, and the leaching system and wet detoxification system are arranged separately, resulting in a large equipment footprint, high investment and operating costs, and low engineering efficiency
[0007] 2. The traditional wet detoxification process does not carry out particle size classification, but uses a ball milling process to reduce the particle size of all chromium-contaminated media
However, the efficiency of ball milling is low, the operation is complicated, and the cost is high, which is not conducive to the practical application of engineering.

Method used

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  • Leaching/wet detoxification method for different chromium pollution media

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Chromium-contaminated miscellaneous fill at the former site of a chromium salt factory in Hunan.

[0057] Step 1: Pre-treat the chromium-contaminated miscellaneous fill, remove large particles > 50mm, and then transport it to a drum scrubber to make a chromium-containing slurry. The processing scale is 100t / h, and the solid-liquid mass ratio of the slurry is controlled. It is 1:3.

[0058] Step 2: The slurry is sieved by a primary hydraulic vibrating sieve, and the sieve (5~50mm) is crushed by an impact crusher to crush a small amount of chromium slag mixed in the soil to ≤5mm, and the sand on the sieve (5~50mm) After being cleaned by the spiral sand washing machine, the chromium slag and fine particle materials under the screen and the undersize (≤5mm) of the primary hydraulic vibrating screen are screened by the secondary hydraulic vibrating screen.

[0059] Step 3: Sieve with the secondary hydraulic vibrating sieve, and the sieved material (2~5mm) enters the primary...

Embodiment 2

[0068] Chromium-contaminated muddy soil at the former site of a chromium salt factory in Hunan.

[0069] Step 1: pre-treat the chrome-contaminated muddy soil, remove large particles > 50 mm, and then transport it to a drum scrubber to make a chromium-containing slurry. The processing scale is 35t / h, and the solid-liquid mass ratio of the slurry is controlled to be 1:2.

[0070] Step 2: The slurry is sieved by a primary hydraulic vibrating sieve, and the sieve (5~50mm) is crushed by an impact crusher to crush a small amount of chromium slag mixed in the soil to ≤5mm, and the sand on the sieve (5~50mm) After being cleaned by the spiral sand washing machine, the chromium slag and fine particle materials under the screen and the undersize (≤5mm) of the primary hydraulic vibrating screen are screened by the secondary hydraulic vibrating screen.

[0071] Step 3: Sieve with the secondary hydraulic vibrating sieve, and the sieved material (2~5mm) enters the primary leaching reaction ...

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Abstract

The invention discloses a leaching / wet detoxification method for different chromium pollution media. According to the method, miscellaneous fill and gravels which are subjected to chromium pollution are subjected to pretreatment, scrubbing and screening, then graded leaching is conducted, and the content of hexavalent chromium in the miscellaneous fill and gravels is reduced. Chromium-polluted silty clay and mucky soil are pretreated, scrubbed and screened, then materials larger than 2 mm are leached, the content of hexavalent chromium in the silty clay and mucky soil is reduced, materials of 2 mm or less are subjected to wet detoxification, and the content of hexavalent chromium in the silty clay and mucky soil reaches the standard. By adopting the organic combination of a same set of treatment system, the two working procedures of leaching and wet detoxification can be switched respectively, so that the investment and operation cost is reduced while the treatment effect is ensured.

Description

technical field [0001] The invention belongs to the field of pollutant treatment, in particular to a leaching / wet detoxification method for different chromium polluted media. Background technique [0002] During the production of chromium salts using the traditional calcium roasting process, a large amount of chromium slag will be produced, which contains high-concentration and highly mobile carcinogen hexavalent chromium. Due to inadequate management and control measures, the chromium slag is stored in disorder and without anti-seepage. After several landfills and coverings, the mixed pollution of chromium slag and the storage area and surrounding soil is extremely serious, which intensifies the migration and diffusion of chromium pollution. Usually, in the chromium-contaminated plots, the formation lithology and soil geological conditions are quite different, including contaminated media such as miscellaneous fill, gravel, silty clay, and silty soil. Different polluting m...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/08B09C1/02
Inventor 肖潇杨添奇纪智慧徐巍成一知王承刚
Owner 湖南新九方科技有限公司
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