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Method and equipment for carrying out detoxification treatment on chromium residue polluted soil

A technology for polluted soil and chromium slag is applied in the field of detoxification treatment of chromium slag polluted soil, and can solve the problems of low degree of mechanization, low efficiency and cumbersomeness of the detoxification process of chromium slag.

Active Publication Date: 2013-05-01
QINGDAO NEW WORLD ENVIRONMENT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, reducing and detoxifying the soil polluted by chromium slag is an important means to protect the environment, but the existing methods for reducing and detoxifying chromium slag are cumbersome, inefficient, and costly, and there is no special equipment for reducing and detoxifying chromium slag. The degree of mechanization of the detoxification process is low, time-consuming and labor-intensive

Method used

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  • Method and equipment for carrying out detoxification treatment on chromium residue polluted soil

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Embodiment 1

[0031] The method for detoxification treatment of chromium slag contaminated soil consists of the following steps:

[0032] a. Grinding the soil containing chromium slag to 200 mesh, and mixing the obtained powder with water to make a slurry;

[0033] B, add the concentrated sulfuric acid that content is 32% and the sodium sulfide that content is 18% in slurry, make the water-soluble hexavalent chromium in it and acid-soluble hexavalent chromium dissolve and form solution;

[0034] c, add 22% ferrous sulfate in the solution as antidote, the reaction time is 8h, the temperature of reaction is 86 ℃, the pH value of controlling its reaction is 6, the hexavalent chromium in the solution is converted into trivalent chromium Solidify in the detoxified chromium slag, and solidify the detoxified soil.

Embodiment 2

[0036] The method for detoxification treatment of chromium slag contaminated soil consists of the following steps:

[0037] a. Grinding the soil containing chromium slag to 180 mesh, and mixing the obtained powder with water to make a slurry;

[0038] B, adding content is the concentrated sulfuric acid of 25% and the sodium sulfide of 20% in slurry, makes the water-soluble hexavalent chromium in it and acid-soluble hexavalent chromium dissolve to form a solution;

[0039] c, adding ferrous sulfate with a content of 16% in the solution as an antidote, the reaction time is 5h, the temperature of the reaction is 74°C, and the pH value of the reaction is controlled to be 5 so that the hexavalent chromium in the solution is converted into trivalent Chromium solidifies in the detoxified chromium slag and solidifies the detoxified soil.

Embodiment 3

[0041] The method for detoxification treatment of chromium slag contaminated soil consists of the following steps:

[0042] a. Grinding the soil containing chromium slag to 220 mesh, and mixing the obtained powder with water to make a slurry;

[0043] B, adding content is the concentrated sulfuric acid of 35% and the sodium sulfide of 15% in slurry, makes the water-soluble hexavalent chromium in it and acid-soluble hexavalent chromium dissolve to form a solution;

[0044] c, add content in the solution and be 24% ferrous sulfate as antidote, the time of reaction is 12h, and the temperature of reaction is 92 ℃, and the pH value of control its reaction is 6.5, and the hexavalent chromium in the solution is converted into three The valent chromium is solidified in the detoxified chromium slag, and the detoxified soil is solidified.

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Abstract

The invention provides a method and equipment for carrying out detoxification treatment on a chromium residue polluted soil. The method comprises the following steps: (a) grinding the soil containing chromium residues into 180-220 meshes and mixing an obtained powder and water into a paste; (b) adding an acidic reagent and an assistant drug to the paste, so that water soluble hexavalent chromium and acid soluble hexavalent chromium are dissolved; and (c) adding ferrous sulfate with content of 16-24% to a solution; and controlling pH value of the reaction to 5-6.5, so that the hexavalent chromiums in the solution are converted into trivalent chromiums and curing detoxified chromium residues so as to cure the detoxified soil. A vibrating feeder of the equipment is connected with a belt conveyor, the belt conveyor is connected with a wet ball mill, the wet ball mill is connected with a reaction kettle and the reaction kettle is connected with a paste filter press; and a sulfuric acid storage tank is connected with the reaction kettle through a pipeline; and a drug dispensing tank is connected with the reaction kettle through a pipeline. According to the invention, the hexavalent chromiums in the chromium residue polluted soil are converted into the trivalent chromiums and the detoxified soil is pressed into blocks, transported to a designated place and stored in the designated place, so that low cost, time conservation and labor conservation are achieved.

Description

Technical field: [0001] The invention relates to the field of detoxification of chromium slag, in particular to a method and equipment for detoxification treatment of chromium slag polluted soil. Background technique: [0002] Chromium slag is industrial waste produced in the process of producing metal chromium and chromium salts. The discharged chromium slag will pollute the soil. When the polluted soil is soaked by rain and snow, the hexavalent chromium contained in it will be dissolved and seeped into the groundwater. Or in rivers and lakes to pollute the environment, the content of hexavalent chromium in water in severely polluted areas can be as high as tens of milligrams per liter, which has exceeded the standard for drinking water by several times. Therefore, reducing and detoxifying the soil polluted by chromium slag is an important means to protect the environment, but the existing methods for reducing and detoxifying chromium slag are cumbersome, inefficient, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00A62D3/37A62D101/43
Inventor 韩清洁
Owner QINGDAO NEW WORLD ENVIRONMENT PROTECTION CO LTD
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