CO2 mineralization grouting method for old goaf

Abstract

The invention discloses a CO2 mineralization grouting method for an old goaf, and belongs to the technical field of goaf treatment. Comprising the following steps that firstly, the goaf grouting range is divided into a straddling zone and a fissure zone, the grout diffusion radius of a caving zone and the grout diffusion radius of the fissure zone under the isobaric grouting condition are determined through experimental area grouting, the caving zone and the fissure zone share the same drill hole for grouting, the grout diffusion radius of the caving zone serves as an index to design the drill hole distance for grouting filling work, and the grouting filling work is completed; filling a caving zone and a fissure zone; then, a mineralizing material and industrial waste gas are injected into the goaf, injected mineralizing material slurry can react with the industrial waste gas, and the goaf is supported while the industrial waste gas is fixed. The industrial waste gas is injected into the goaf to react with the slurry to be sealed underground, the environmental pollution is effectively reduced, a product generated after the reaction with the slurry plays a role in supporting and protecting the goaf, and a positive role is played in environmental protection and treatment.

Description

Technical field [0001] The invention belongs to the technical field of goaf management, and more specifically, relates to a kind of CO2 in old goaf area. 2 Mineralization grouting method. Background technique [0002] Based on the huge annual industrial waste gas emissions in China (CO in industrial waste gas 2 content up to more than 90%), and under the dual background of limited means of recycling industrial waste gas and the existence of a large number of old goaf areas in China that are in urgent need of grouting treatment, it is proposed to develop technical means to mineralize industrial waste gas, fly ash, etc. The reaction carrier and the old goaf are storage places for fly ash-based porous geopolymers suitable for grouting treatment in the old goaf area of ​​coal mines; under the conditions of sealing the goaf, the injection of mineralized materials is completed, thereby completing the mining process. Mineralization control in empty areas. [0003] In recent year...

AI Technical Summary

Problems solved by technology

[0004] 1. The grouting diffusion radius of the caving zone and the fissure zone is considered to be equal, resulting in a deviation in the grouting hole spacing design;

[0005] 2. Taking the minimum diffusion radius of the caving zone and fissure zone as the index to design the drilling hole spacing, resulting in too small drilling hole spacing for grouting, resulting in too many drilling holes and too large drilling volume;

[0006] 3. The old mined-out area can be used as a reaction site for mineralized material slurry and industrial waste gas, which has not been fully utilized

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