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A kind of harmless treatment method of shield slag

A treatment method and a harmless technology, applied in the field of soil treatment, can solve the problems of loose mud, high moisture content, affecting the safe stacking of the soil yard, and forming into a slurry.

Active Publication Date: 2021-08-20
中铁环境科技工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the natural stockpiling process, the surface soil is dry and cracked, while the soil below it is still muddy and loose with high moisture content and even becomes slurry, which is easy to form landslides, thus affecting the safe stockpiling of soil stockpiles.

Method used

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  • A kind of harmless treatment method of shield slag
  • A kind of harmless treatment method of shield slag
  • A kind of harmless treatment method of shield slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add water to the shield dregs to make slurry, and then sieve to separate coarse particles from fine particles to obtain fine particle slurry. The content of foaming agent in the fine particle mud is 68.9mg / kg, and the mud volume is 1000ml;

[0055] For the first solubilization, dissolution and absorption treatment, calcium-containing compounds (molar ratio CaO:Ca(HCO 3 ) 2 =1:0.35) and sodium carbonate, the mass ratio of calcium-containing compound to mud is 1.5:1000, and the mass ratio of sodium carbonate addition to mud is 0.5:1000. Medium-speed mechanical stirring, the stirring rate is 200rpm, and the stirring time is 5min, so that the mud and the agent are mixed evenly;

[0056] For the second chemical defoaming treatment, add polydimethylsiloxane copolyol to the mud, the mass ratio of the amount of polydimethylsiloxane copolyol added to the mud is 0.5:10000, and medium-speed mechanical stirring , the stirring speed is 200rpm, and the stirring time is 5min, so th...

Embodiment 2

[0060] Add water to the shield dregs to make pulp, and then sieve to separate coarse particles from fine particles. A fine-grained slurry is obtained. The content of the foaming agent in the mud is 45.3mg / kg, and the mud volume is 1000ml;

[0061] For the first solubilization, dissolution and absorption treatment, calcium-containing compounds (molar ratio CaO:Ca(HCO 3 ) 2 =1:0.35) and sodium carbonate, the mass ratio of calcium-containing compound to mud is 1.5:1000, and the mass ratio of sodium carbonate addition to mud is 0.5:1000. Medium-speed mechanical stirring, the stirring rate is 200rpm, and the stirring time is 5min, so that the mud and the agent are mixed evenly;

[0062] For the second chemical defoaming treatment, add polydimethylsiloxane copolyol to the mud, the mass ratio of the amount of polydimethylsiloxane copolyol added to the mud is 0.5:10000, and medium-speed mechanical stirring , the stirring speed is 200rpm, and the stirring time is 5min, so that the ...

Embodiment 3

[0066] Add water to the shield dregs to make pulp, and then sieve to separate coarse particles from fine particles. A fine-grained slurry is obtained. The content of the foaming agent in the mud is 23.5mg / kg, and the mud volume is 1000ml;

[0067] For the first solubilization, dissolution and absorption treatment, calcium-containing compounds (molar ratio CaO:Ca(HCO 3 ) 2 =1:0.35) and sodium carbonate, the mass ratio of calcium-containing compound to mud is 1.5:1000, and the mass ratio of sodium carbonate addition to mud is 0.5:1000. Medium-speed mechanical stirring, the stirring rate is 200rpm, and the stirring time is 5min, so that the mud and the agent are mixed evenly;

[0068] For the second chemical defoaming treatment, add polydimethylsiloxane copolyol to the mud, the mass ratio of the amount of polydimethylsiloxane copolyol added to the mud is 0.5:10000, and medium-speed mechanical stirring , the stirring speed is 200rpm, and the stirring time is 5min, so that the ...

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Abstract

The invention relates to a harmless treatment method for shield tunneling dregs. The harmless solubilization-dissolution-absorption-chemical defoaming-flocculation-sedimentation joint treatment technology of shield dregs proposed by the present invention rationally mixes the doses of each drug, and first adds a desorption agent to perform a solubilization, dissolution and absorption of the mud to increase the surface of the soil particles. Ionization energy, and increase the negative charge on the surface of soil particles, reduce the adsorption force of soil particles to anionic and non-ionic foam agents, make the foam agent desorb from the surface of soil particles into the water phase, and realize the separation of foam agents and soil particles; Then add a chemical defoaming agent to react with the foaming agent in the shield dregs; finally, add a flocculant to further promote the removal of the foaming agent and ensure the long-term removal effect. Foaming agents and other suspended solids in the water phase after mud-water separation are dehydrated and dried after flocculation, adsorption and precipitation, and finally incinerated or landfilled. The foam agent transferred into the water phase by desorption is subjected to final harmless treatment.

Description

technical field [0001] The invention relates to a harmless treatment method for shield-tunnel dregs, in particular to a treatment method for removing foaming agents in shield-tunnel dregs, and belongs to the field of soil treatment. Background technique [0002] Tunnel construction is an important part of urban rail transit construction. At present, the method of tunnel construction at home and abroad is mainly the shield method, which will produce a large amount of shield muck during the construction process. Among them, the earth pressure balance shield construction method is used, which can not only produce a large amount of slag, but also to ensure the smooth excavation of the shield machine, spray foam and other organic compounds in the excavation soil layer, by changing the flow plasticity of the soil, to ensure the shield tunneling The smooth excavation of the machine can reduce the wear of the blade during the excavation process. Due to the addition of organic comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/121C02F11/122C02F11/143C02F11/147
CPCC02F11/121C02F11/122C02F11/143C02F11/147
Inventor 刘东斌言海燕郭家庆刘烨煊徐德良陈亚利王喜李青
Owner 中铁环境科技工程有限公司