In-situ repair method of tailing sand heavy metal

An in-situ remediation and heavy metal technology, applied in the restoration of contaminated soil, etc., can solve the problems of unrepairable heavy metal pollution and no reports, and achieve the effects of reducing migration and infiltration, reducing waste of resources, and low cost

Inactive Publication Date: 2017-12-15
NAT RESERACH CENT OF GEOANALYSIS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the technical solution of CN201610594686.0 cannot repair the heavy metal pollution of any depth, only the passivation repair of a small range of depth
[0006] To sum up, in the current domestic research, there is no related research on the use of attapulgite for in-situ heavy metal passivation restoration—that is, related experimental research on directly injecting attapulgite into the soil of the experimental area to passivate heavy metals in the soil. Basically, related research work is carried out through indoor pot experiments, especially for the treatment of heavy metal pollution in tailings ponds, the field operability is strong, economical, convenient, and practical methods have not been reported yet.

Method used

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  • In-situ repair method of tailing sand heavy metal
  • In-situ repair method of tailing sand heavy metal
  • In-situ repair method of tailing sand heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] High-pressure two-pipe rotary spraying process, ZJB-95 high-pressure pump, JAGUAR-6 high-pressure machine, JZP-1m 3 Type mixer, and a number of other accessories.

[0056] The heavy metals in the soil are passivated by the high-pressure rotary spraying technology by drilling holes in the underground soil and lowering the injection pipe, and then mixing the modified attapulgite and water under the conditions of air pressure 0.6MPa and pump pressure 25MPa to prepare a slurry to The slurry ratio of 1.12, the slurry flow rate is 90L / min, the speed increase is 14cm / min, and the rotating speed is 14r / min. The modified attapulgite is sprayed into the soil with the rotary spray column as the center of the circle and the radius is 30cm (the rotary spray range The maximum radius is 30cm), the soil: material addition ratio is 10:1. In the test, the total amount of modified attapulgite used is 2 tons, and a total of 6 holes are sprayed. Since the maximum buried depth of tailings s...

Embodiment 2

[0058] High-pressure two-pipe rotary spraying process, ZJB-95 high-pressure pump, JAGUAR-6 high-pressure machine, JZP-1m 3 Type mixer, and a number of other accessories.

[0059] The heavy metals in the soil are passivated by the high-pressure rotary spraying technology by drilling holes in the underground soil and lowering the injection pipe, and then mixing the modified attapulgite and water under the conditions of air pressure 0.6MPa and pump pressure 25MPa to prepare a slurry to The slurry ratio is 1.12, the slurry flow rate is 80L / min, the speed increase is 20cm / min, and the rotation speed is 16r / min. The modified attapulgite is sprayed into the soil with the rotary spray column as the center and a radius of 30cm. Soil: material The addition ratio is 10:1. In the test, the total amount of modified attapulgite used is 2 tons, and a total of 6 holes are sprayed. Since the maximum buried depth of the tailings sand is about 5m, the average material consumption per hole is 26...

Embodiment 3

[0061] High-pressure two-pipe rotary spraying process, ZJB-95 high-pressure pump, JAGUAR-6 high-pressure machine, JZP-1m 3 Type mixer, and a number of other accessories.

[0062] The heavy metals in the soil are passivated by the high-pressure rotary spraying technology by drilling holes in the underground soil and lowering the injection pipe, and then mixing the modified attapulgite and water under the conditions of an air pressure of 0.6MPa and a pump pressure of 20MPa to prepare a slurry to With a slurry ratio of 1.12, a slurry flow rate of 72L / min, a speed increase of 15cm / min, and a rotation speed of 14r / min, the modified attapulgite is sprayed into the soil with a rotary spray column as the center and a radius of 30cm. Soil: material The addition ratio is 10:1. In the test, the total amount of modified attapulgite used is 2 tons, and a total of 6 holes are sprayed. Since the maximum buried depth of tailings sand is about 5m, the average material consumption per hole is ...

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Abstract

The invention discloses an in-situ repair method of tailing sand heavy metal. The in-situ repair method of the tailing sand heavy metal is characterized in that a high-pressure jet grouting process is adopted to perform the jet grouting on modified attapulgite-contained pulp into tailing sand in situ, so that the heavy metal is cured.

Description

technical field [0001] The invention belongs to the soil restoration technology, and in particular relates to an in-situ restoration method for tailings sand heavy metals. Background technique [0002] Contaminated area / soil treatment usually includes solidification method, vitrification method, soil cleaning, high temperature separation and on-site soil washing (including acid washing) method. [0003] (1) Physical restoration: Physical restoration mainly includes electric restoration, electrothermal restoration and soil leaching. The principle of electric remediation technology is similar to that of a battery, which allows heavy metal ions to move in a directional manner under the condition of electricity, thereby removing them from the soil. Electrothermal restoration technology uses the characteristics of some heavy metals to volatilize quickly at high temperatures, and uses high-frequency voltage to heat the soil. The heavy metals are volatilized by heat and leave the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 朱晓华包永东马博刘晓端袁欣
Owner NAT RESERACH CENT OF GEOANALYSIS
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