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Chromium slag detoxification method based on sludge

A technology for chromium slag and sludge, which is applied in the field of new treatment of chromium slag, can solve the problems of difficult chromium slag treatment, high cost of microwave technology, etc., and achieve the effects of avoiding secondary pollution, strong natural tolerance, and reducing usage

Inactive Publication Date: 2016-09-14
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of microwave technology is high, so it is difficult to be used in large-scale chromium slag treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mix sodium sulfate, sludge and carbon source solution according to a certain proportion, control the dry sludge content of the mixed solution to be 0.1-5%, the solid content of 0.5-5%, the organic carbon content of 0.5-5%, and the sulfate (in SO ) / the mass ratio of organic carbon is 0.2: 1, and the mixed solution reacts for 1 day to obtain chromium slag repairing agent;

[0019] (2) crushing the chromium slag to below 5mm, then mixing with the biological agent and ferrous sulfate described in step (1), the mixing ratio is that the mass ratio of ferrous sulfate, chromium slag and the agent is 0.2:1:(1-1.5 ), and then placed in a closed yard for storage;

[0020] (3) During the storage period, spray organic solution on the surface of the site every 5 days. The average spray amount of the site is equivalent to 60-80mm of rainfall. Natural rainfall can replace artificial spray. After 2 water sprays, The content of hexavalent chromium in chromium slag is less than 2mg / k...

Embodiment 2

[0022] (1) Mix the sludge with the carbon source solution according to a certain proportion, and control the dry sludge content of the mixed solution to be 10-20%, the solid content of 10-25%, the organic carbon content of 10-25%, the sulfate (with SO4 The mass ratio of note) / organic carbon is (0-1): 1, and the mixed solution reacts for 0-5 days to obtain chromium slag repairing agent;

[0023] (2) Crushing the chromium slag to less than 5mm, then mixing with the biological agent and ferrous sulfate described in step (1), the mixing ratio is that the mass ratio of ferrous sulfate, chromium slag and the agent is 0.2:1:(0.1-0.5 ), and then placed in a closed yard for storage;

[0024] (3) During the storage period, the surface of the site is sprayed with sulfuric acid solution every 8 days. The average spray amount of the site is equivalent to 30mm of rainfall. Natural rainfall can replace manual spraying. Hexavalent chromium content is less than 4mg / kg.

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Abstract

The invention discloses a novel method for treating chromium slag. Sludge, a carbon source and ferrous sulfate are prepared into chemical agents to be applied into the chromium slag; and then a special curing manner is adopted, and hexavalent chromium slowly released in the chromium slag is gradually reduced. By means of the method, the hexavalent chromium can be efficiently reduced at low cost, and meanwhile secondary pollution of sulfate and the sludge is avoided.

Description

technical field [0001] The invention provides a new method for treating chromium slag, which uses sludge to cultivate a reducing bacterial agent, combines with reducing agents such as ferrous sulfate and applies it to the chromium slag, and then adopts a special maintenance method, which can efficiently reduce hexavalent chromium, and at the same time The secondary pollution of sulfate is avoided, and the invention belongs to the field of environmental protection. Background technique [0002] Chromium slag is a by-product emitted during the production of dichromate. Because it contains water-soluble hexavalent chromium, it is extremely toxic. If it is piled up in the open without treatment, it will cause different degrees of pollution to groundwater sources, rivers or sea areas, seriously endangering human health and the growth of animals and plants. [0003] How to repair chromium slag has always been a difficult problem in the environmental protection circle. Although t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/105B09C1/08
Inventor 张大磊李公伟郝志鹏赵昱皓
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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