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Method for disposing downhole goaves on basis of contaminated soil

A technology of polluted soil and disposal method, which is applied in the restoration of polluted soil, earth drilling and mining, soil conditioning materials, etc. It can solve the problems of large occupied area of ​​polluted soil, nowhere to restore the restored soil, secondary environmental pollution, etc. , to achieve the effect of preventing surface subsidence, large processing capacity and low cost

Active Publication Date: 2017-01-04
XUZHOU CUMT BACKFILL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the existing surface remediation sites, such as the large occupied area, high remediation cost, long remediation period, secondary environmental pollution and nowhere to remediate the soil, and to provide an underground mining method based on polluted soil. Empty area disposal method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The soil that reaches the pollutant control standard after the ex-situ restoration is crushed and screened on the ground to obtain soil particles with a particle size of <25mm; %, fly ash 23%, P.O 52.5 cement 5%, gypsum powder 9%, lime powder 5%, pumping water reducer 3%) and water are weighed and mixed according to the mass ratio of 2.87:0.13:1 It is made into a paste-like slurry, which is sent to the underground goaf through self-flowing pipelines or pressurized pumps, where a dense solidified body is formed in the goaf to complete the disposal of contaminated soil.

Embodiment 2

[0025] Example 2: According to the environmental investigation report on the sites left after the relocation of urban industrial enterprises filed by the environmental protection department, excavate the heavy metal-contaminated sites that need to be repaired in situ. Crushed and sieved to obtain polluted soil particles with a particle size of <25mm; then the polluted soil particles were mixed with additives (mass percentage of the additives: heavy metal chelating agent 55%, acid-base buffering agent 3%, surfactant 18%, superfine Fly ash 24%) was fully mixed to obtain pre-stabilized contaminated soil; finally, the soil was mixed with cement (the mass percentage of the cement was: slag powder 72%, fly ash 11%, P·O 52.5 cement 5%, gypsum powder 7%, lime powder 3%, pumping superplasticizer 2%) and water according to the mass ratio of 2.83:0.16:1, weigh and mix to form a paste slurry, which flows through the pipeline or pressurizes Pump it to the underground goaf, and form a dense...

Embodiment 3

[0026] Example 3: According to the environmental investigation report on the sites left after the relocation of urban industrial enterprises filed by the environmental protection department, excavate the sites polluted by heavy metals and semi-volatile organic compounds that need to be repaired in situ. The excavation depth is 6 m. The polluted soil is crushed and screened on the ground to obtain polluted soil particles with a particle size of <25mm; then the polluted soil particles are mixed with additives (the mass percentage of the additives is: heavy metal chelating agent 18%, acid-base buffering agent 4%, surfactant 33%, ultra-fine fly ash 45%) were fully mixed to obtain pre-stabilized contaminated soil; finally, the soil was mixed with cementing material (the mass percentage of the cementing material is: slag powder 76%, fly ash 10%, P·O 52.5 3% of cement, 6% of gypsum powder, 2% of lime powder, 3% of pumping water reducing agent) and water are weighed according to the ma...

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Abstract

The invention discloses a method for disposing downhole goaves on the basis of contaminated soil, and belongs to methods for disposing downhole goaves. The method includes excavating contaminated sites required to be remedied in an ex-situ manner, and crushing and sieving the contaminated soil to obtain contaminated soil particles with the particle sizes smaller than 25 mm; sufficiently mixing the contaminated soil particles and additives with one another to obtain contaminated soil subjected to stabilization pretreatment and omitting pretreatment procedures if soil in other places reaches pollutant control standards after the soil in the other places is remedied in an ex-situ manner; mixing and stirring the soil subjected to stabilization pretreatment or the soil without treatment requirements, cementing materials and water with one another according to mass ratios to obtain paste slurry, allowing the paste slurry to automatically flow via pipelines to the downhole goaves or pressurizing and pumping the paste slurry to the downhole goaves, and forming dense solidified bodies in the goaves to completely dispose the contaminated soil. The method has the advantages that problems of large occupied areas for treating existing contaminated soil in remedied sites on earth surfaces, high treatment cost, long remediation periods, secondary environmental pollution and incapability of disposing and accommodating remedied soil can be solved by the aid of the method, and the double purposes of ultimately disposing the contaminated soil and administering the downhole goaves can be achieved.

Description

technical field [0001] The invention relates to an underground goaf disposal method, in particular to an underground goaf disposal method based on polluted soil. Background technique [0002] On May 31, 2016, the State Council issued the "Soil Pollution Prevention and Control Action Plan" (referred to as "Soil Ten Measures"), clearly deploying China's soil pollution prevention and control work in the next period. A large number of contaminated soils caused by the relocation of industrial enterprises and urban development in my country urgently need to be repaired. In the process of redevelopment and utilization of urban industrial contaminated sites, a large amount of contaminated soil is excavated for ex-situ repair treatment. The treatment methods include chemical oxidation / reduction Technology, thermal desorption technology, cement kiln co-processing technology, etc. These treatment methods generally have high cost, small processing capacity, long repair period, and need t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00E21F15/00C09K17/00
CPCB09C1/00C09K17/00E21F15/005
Inventor 李亮马英张培莉刘刚
Owner XUZHOU CUMT BACKFILL TECH
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