Reclamation method for hexavalent chromium contaminated soil

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

Active Publication Date: 2016-06-15
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 6

[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 ...

Embodiment 2 6

[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...

Embodiment 3 6

[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 cu...

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Abstract

The invention provides a reclamation method for hexavalent chromium contaminated soil. The reclamation method comprises the processes of reducing hexavalent chromium in the contaminated soil and preparing building bricks with the soil as raw materials. According to the content of the hexavalent chromium in the soil, the hexavalent chromium is reduced to trivalent chromium with low toxicity with ferrous sulfate as a reducing agent, and then the trivalent chromium is used for preparing the bricks. According to the reclamation method for the hexavalent chromium contaminated soil, not only is the leaching concentration of the hexavalent chromium in the soil reduced, but also the soil is taken as one of the raw materials for preparing the bricks. The prepared bricks are used as building materials and thus harmless disposal and reclamation of the hexavalent chromium contaminated soil are achieved.

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 Applications(China)
IPC IPC(8): B09C1/08B09B3/00B28B11/24B28B1/08C04B30/00C04B18/04C04B111/10
CPCY02W30/91B09C1/08B09B3/00B28B1/08B28B11/24C04B30/00C04B2111/1037
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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