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A kind of resource recovery method of hexavalent chromium polluted soil

A technology of polluted soil and hexavalent chromium, which is applied in the field of resource utilization of polluted soil, can solve problems such as human health hazards, unmanned treatment, soil and groundwater pollution, etc., and achieve the effect of reducing brick-making costs, simple method, and obvious economic benefits

Active Publication Date: 2018-05-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pollution of chromium compounds mainly comes from the three wastes discharged from chromium salt production, electroplating, tanning and pharmaceutical industries. Most of these chromium exists in the form of hexavalent chromium, which is highly toxic and will cause serious harm to human health after entering the soil and groundwater.
According to relevant statistical data, there are still more than 40 places where chromium slag is left behind in my country, most of which are abandoned and left untreated; among the more than 1,000 chromium plating factories in China, some of them have serious pollution problems of soil and groundwater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Recycling of Hexavalent Chromium Contaminated Soil

[0018] (1) Reduction of hexavalent chromium in soil: crush the contaminated soil, pass through a 100-mesh sieve, add water to adjust the soil moisture content to 40%, add a certain amount of ferrous sulfate according to the content of hexavalent chromium in the soil, and maintain for 7 days;

[0019] (2) Mixing of soil and resource-based chemicals: fully stir and mix the soil treated with reducing agent, resource-based chemicals, and activators at a mass ratio of 10:30:4 to obtain a soil mixture;

[0020] (3) Brick preparation and maintenance: Add the soil mixture into the brick mold, add water to adjust the moisture content to 40%, stir and shake, and then place it in a curing box at a temperature of 20 ° C and a relative humidity of 50 % under the condition of curing for 24 hours, remove the formwork, continue to maintain under this condition for 10 days, test the compressive strength of the bricks after c...

Embodiment 2

[0023] Example 2 Recycling of Hexavalent Chromium Contaminated Soil

[0024] (1) Reduction of hexavalent chromium in soil: crush the contaminated soil, pass through a 100-mesh sieve, add water to adjust the soil moisture content to 50%, add a certain amount of ferrous sulfate according to the content of hexavalent chromium in the soil, and maintain for 7 days;

[0025] (2) Mixing of soil and resource-based chemicals: fully stir and mix the soil treated with reducing agent, resource-based chemicals, and activators at a mass ratio of 10:30:4 to obtain a soil mixture;

[0026] (3) Brick preparation and maintenance: Add the soil mixture into the brick mold, add water to adjust the moisture content to 40%, stir and shake, and then place it in a curing box at a temperature of 40°C and a relative humidity of 70%. % under the condition of curing for 24 hours, remove the formwork, continue to maintain under this condition for 20 days, test the compressive strength of the bricks after c...

Embodiment 3

[0029] Example 3 Recycling of Hexavalent Chromium Contaminated Soil

[0030] (1) Reduction of hexavalent chromium in soil: crush the contaminated soil, pass through a 100-mesh sieve, add water to adjust the soil moisture content to 60%, add a certain amount of ferrous sulfate according to the content of hexavalent chromium in the soil, and maintain for 7 days;

[0031] (2) Mixing of soil and resource-based chemicals: fully mix the soil treated with the reducing agent with resource-based chemicals and activators at a mass ratio of 10:50:10 to obtain a soil mixture;

[0032] (3) Brick preparation and maintenance: Add the soil mixture into the brick mold, add water to adjust the moisture content to 60%, stir and shake, and then place it in a curing box at a temperature of 50 ° C and a relative humidity of 80 % of the condition of curing 24 hours after removal of formwork, continue to maintain under this condition for 30 days, test the compressive strength of the bricks after curi...

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Abstract

The invention provides a resource recovery method of hexavalent chromium polluted soil, which includes the reduction of hexavalent chromium in the polluted soil and the preparation process of building bricks using soil as raw material. According to the content of hexavalent chromium in the soil, ferrous sulfate is used as a reducing agent to reduce hexavalent chromium to trivalent chromium with low toxicity, and then used for the preparation of bricks. The resource recovery method of hexavalent chromium-contaminated soil of the present invention not only reduces the leaching concentration of hexavalent chromium in the soil, but also uses the soil as one of the raw materials for the preparation of bricks, and the prepared bricks are used as building materials, realizing The harmless treatment and resource utilization of hexavalent chromium-contaminated soil were discussed.

Description

technical field [0001] The present invention relates to the recycling technology of polluted soil, in particular to a resource recycling method of hexavalent chromium contaminated soil. The contaminated soil is used for making bricks and used as a resource recycling of building materials. Background technique [0002] With the development of industry and the utilization of resources, the soil of our country is suffering from more and more serious pollution problems. The pollution of chromium compounds mainly comes from the three wastes discharged from chromium salt production, electroplating, tanning and pharmaceutical industries. Most of these chromium exists in the form of hexavalent chromium, which is highly toxic and will cause serious harm to human health after entering the soil and groundwater. . According to relevant statistical data, there are still more than 40 places where chromium slag is left behind in my country, most of which are abandoned and left untreated; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09B3/00B28B11/24B28B1/08C04B30/00C04B18/04C04B111/10
CPCY02W30/91
Inventor 王晓东高丕成闫涛马洪敏杜斌张勇纪鹏阁董静刘小欢
Owner UNIV OF JINAN
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