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A method for remediating cadmium-contaminated soil by symbiotic leaching

A cadmium-contaminated soil and cadmium-contaminated technology, which is applied in the field of soil remediation, can solve the problems of non-recyclable use, easy return of cadmium ions to the soil, and difficult treatment, so as to achieve remarkable soil remediation effects, overcome repeated cadmium pollution, and implement operation short time effect

Active Publication Date: 2019-02-26
湖南科臣环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the heavy metal cadmium-contaminated soil remediation technology in the prior art has the disadvantages of large amount of engineering, complicated implementation, high treatment cost and easy to cause weakening of soil fertility, while the traditional method of leaching cadmium with alkaline lime or other reagents, Not only will it destroy the soil structure, but also the cadmium ions will easily return to the soil, which is difficult to deal with, has defects such as poor repair effect and cannot be reused.

Method used

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  • A method for remediating cadmium-contaminated soil by symbiotic leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 62kg of high-cadmium-polluted soil with 35kg of water and 3kg of zinc chloride, and add it to a forced mixer. The lifting speed of the hopper of the forced mixer is 20m / min. min, the power of the stirring motor is 33kW, and a vibrating rod is inserted to completely crush the gravel and sand in the soil to make a slurry, which is then added to a ball mill for wet grinding, and the cylinder speed is 26r / min to obtain fine Soil mud; then transfer the prepared soil mud to a filter with a mesh size of 130 μm, let it stand for 3 hours, so that free water is separated under the action of gravity to obtain the mud in a non-flowing state, and then use a filter with a filter area of ​​60m 2 A filter press with 40 filter chambers and a working pressure of 1.0 MPa performs further solid-liquid separation to achieve the purpose of soil cadmium removal; sodium hydroxide solution is added to the separated filtrate to form a cadmium hydroxide precipitate, Then filter and separate, ...

Embodiment 2

[0033] Mix 68kg of high-cadmium-contaminated soil with 30kg of water and 2kg of zinc sulfate, and add it to a forced mixer. The lifting speed of the hopper of the forced mixer is 18m / min, the power of the lifting motor is 5kW, and the rotation speed of the stirring shaft is 25r / min , the power of the stirring motor is 25kW, and a vibrating rod is inserted to completely crush the gravel and sand in the soil to make a slurry, and then put it into a ball mill for wet grinding, and the cylinder speed is 16r / min to make a fine soil Mud; then transfer the obtained soil slurry to a filter with a mesh size of 50 μm, let it stand for 4 hours, so that the free water is separated under the action of gravity, and obtain the mud in a non-flowing state, and then use a filter area of ​​40m 2A filter press with 30 filter chambers and a working pressure of 0.5 MPa performs further solid-liquid separation to achieve the purpose of soil cadmium removal; potassium hydroxide solution is added to th...

Embodiment 3

[0036] Mix 56kg of high-cadmium-contaminated soil with 40kg of water and 4kg of zinc nitrate, and add it to a forced mixer. The lifting speed of the hopper of the forced mixer is 25m / min, the power of the lifting motor is 10kW, and the rotation speed of the stirring shaft is 40r / min , the power of the stirring motor is 40kW, and a vibrating rod is inserted to completely crush the gravel and sand in the soil to make a slurry, and then put it into a ball mill for wet grinding, and the cylinder speed is 36r / min to make a fine soil Mud; then transfer the obtained soil slurry to a filter with a mesh size of 200 μm, let it stand for 2 hours, so that the free water is separated under the action of gravity, and obtain the mud in a non-flowing state, and then use a filter area of ​​80m 2 A filter press with 50 filter chambers and a working pressure of 1.6 MPa for further solid-liquid separation to achieve the purpose of removing cadmium from the soil; add barium hydroxide solution to th...

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Abstract

The invention belongs to the technical field of soil remediation, and provides a method for remedying cadmium contaminated soil through symbiotic leaching. The method comprises the steps that high-cadmium-contaminated soil, water and zinc salt are mixed, smashed and ground, fine soil mud is prepared and subjected to standing and press filtering on a filter net, cadmium ions are separated along with zinc salt, alkali liquor is added for filtering separation, zinc salt is repeatedly utilized along with alkali liquor, and the purpose of removing cadmium from soil is achieved. Compared with a traditional method, the method for remedying cadmium contaminated soil can efficiently and rapidly remove cadmium in cadmium contaminated soil through the symbiosis characteristic of cadmium and zinc, produces no secondary pollution, is high in soil remediation efficiency and remarkable in remediation effect, produces no influence on the soil structure and soil fertility, can be repeatedly used, is simple in whole process, can obtain raw materials easily, and is low in cost and suitable for being applied and popularized in a large scale.

Description

technical field [0001] The invention belongs to the technical field of soil remediation and provides a method for remediating cadmium-contaminated soil by symbiotic leaching. Background technique [0002] With the rapid growth of population and the continuous expansion of industrial and agricultural production, the situation of soil heavy metal pollution is becoming more and more serious, which has become a serious environmental problem facing the world. Heavy metal pollution not only changes the physical, chemical and biological properties of soil, reduces the yield and quality of crops, but also can reach the human body through the food chain, directly endangering human health. Among them, cadmium is particularly polluted due to its wide distribution, high biological toxicity, and easy accumulation by crops. Therefore, it is of great significance to study various remediation technologies to control soil cadmium pollution for agricultural development and food security. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 陈庆曾军堂
Owner 湖南科臣环境科技有限公司
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