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Repairing and resourceful treatment method of contaminated soil

A technology of polluted soil and disposal method, applied in the field of polluted soil remediation and resource disposal, can solve the problems of increased cost of ceramsite products, high production cost and high roasting temperature

Inactive Publication Date: 2017-04-12
ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the publication number CN10235870A discloses a method for producing ceramsite by sintering high-chromium-contaminated soil. The molding pressure is high, the calcination time is long, and the calcination temperature is high, resulting in high production cost of ceramsite. The density of ceramsite is high, and the economic benefit is poor; the patent with the publication number of CN102173850A discloses a technology of energy-saving and consumption-reducing polluted soil and dredged sediment to make ceramsite, and its demand for river sediment severely limits the application of this technology. The area of ​​application and the long firing time lead to an increase in the cost of ceramsite products
To sum up, the technology of preparing ceramsite from polluted soil in my country today has the problems of high cost and geographical restrictions.

Method used

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  • Repairing and resourceful treatment method of contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method of preparing light ceramsite from polycyclic aromatic hydrocarbon powder clay in a certain site is as follows:

[0026] (1) ball mill the contaminated soil of the site to 80 meshes with a ball mill, and screen the soil particle size through a vibrating screen;

[0027] (2) Add 3% of sludge, 5% of wood flour, and 5% of water, and mix well.

[0028] (3) The mixed raw materials are sent to a granulator for granulation to obtain a green body.

[0029] (4) drying the green body in step (3) and sending it to a rotary kiln for roasting at high temperature. The firing temperature was 1150°C, and the firing time was 15 min.

[0030] (5) After the fired ceramsite is naturally cooled, the ceramsite prepared from the polycyclic aromatic hydrocarbon-contaminated soil is obtained. After testing, the content of volatile and non-volatile organic compounds in ceramsite products is lower than the detection limit (GB 5085), and the ceramsite products belong to class 800 (GB / ...

Embodiment 2

[0033] The method for preparing light ceramsite for total petroleum hydrocarbon sand in a site is as follows:

[0034] (1) ball mill the contaminated soil of the site to 80 meshes with a ball mill, and screen the soil particle size through a vibrating screen;

[0035] (2) Add 20% sludge, 3% wood flour, 0% water, and mix well.

[0036] (3) The mixed raw materials are sent to a granulator for granulation to obtain a green body.

[0037] (4) drying the green body in step (3) and sending it to a rotary kiln for roasting at high temperature. The firing temperature was 1100°C, and the firing time was 10 min.

[0038] (5) After the fired ceramsite is naturally cooled, the ceramsite prepared with total petroleum hydrocarbon polluted soil is obtained. After testing, the content of organic pollutants in ceramsite products is lower than the detection limit (GB 5085), and the ceramsite products belong to class 600 (GB / T 17431).

[0039] (6) The exhaust gas produced in step (4) is subj...

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Abstract

The invention discloses a repairing and resourceful treatment method of contaminated soil. The repairing and resourceful treatment method comprises the steps of controlling the particle size of the contaminated soil to be 80 meshes or below, adding sludge, wood powder, and water in certain proportion into the soil, mixing the materials to prepare a raw blank in a prilling disk, adjusting moisture, afterwards sending the raw blank into a rotary kilin to be subjected to roasting treatment, tail gas treatment, industrial water treatment and the like. Through the adoption of the repairing and resource treatment method to treat the soil which is contaminated by polycyclic aromatic hydrocarbons, not only the purpose of repairing the soil is achieved, problem of application orientation of the repaired soil is also solved, and the prepared ceramsite can directly create economic benefits.

Description

technical field [0001] The invention relates to a method for restoring and recycling polluted soil, in particular to a method for preparing light ceramsite from organic polluted soil, heavy metal polluted soil or organic-heavy metal composite polluted soil. The invention belongs to the restoration and recycling of polluted soil. Disposal field. Background technique [0002] In the second half of the last century, my country's industrialization level has increased rapidly, and the national strength has grown rapidly, but also a large number of polluted sites have been left. These polluted sites are most typical of organic pollution and heavy metal pollution, with the widest distribution and the largest amount to be rehabilitated. Since the 1990s, my country has gradually paid attention to environmental protection, and soil remediation technology has gradually developed. At present, various soil remediation technologies are becoming more and more mature, but the way out of soi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/132
CPCC04B33/1321C04B33/1325C04B33/1327C04B38/009Y02P40/60
Inventor 黄海何云飞杨勇殷晓东李鹏牛静张文徐峰陈美平田立斌杜伟
Owner ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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