CN-120402176-B - Mine carbon dioxide adsorption sealing and flame retarding method

Abstract

The invention discloses a mine carbon dioxide adsorption sealing and flame retarding method which comprises the following steps of preparing a carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid, preparing a sealing carbon-fixing flame retarding material, mixing a prepared mineralized bacteria liquid, a saturated CaCl 2 solution/a saturated calcium acetate solution to obtain the sealing carbon-fixing flame retarding material, uniformly coating the carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid on the surface of a coal sample in a mine carbon dioxide aggregation area, standing for a period of time, fully adsorbing carbon dioxide in a downhole environment of the coal sample after treatment, and then spraying the sealing carbon-fixing flame retarding material on the surface of the coal sample to generate a calcium carbonate precipitation layer so as to realize carbon dioxide adsorption sealing and goaf pore sealing. The invention can realize stable carbon fixation and sealing of carbon dioxide in the underground goaf of the mine, and simultaneously effectively inhibit spontaneous combustion of underground coal, thereby fundamentally reducing emission of underground CO 2 .

Inventors

• WANG YANMING
• LIU RUIJIE
• LI DINGRUI
• CHEN XIAOYU

Assignees

• 中国矿业大学

Dates

Publication Date

20260505

Application Date

20250428

Claims (4)

1. 1. The mine carbon dioxide adsorption sealing and flame retarding method is characterized by comprising the following steps of: s1, preparing a carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid; S2, preparing a carbon-fixing and sealing flame-retardant material, namely mixing the prepared mineralized bacterial liquid, a saturated CaCl 2 solution/a saturated calcium acetate solution to obtain the carbon-fixing and sealing flame-retardant material; S3, uniformly coating the carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid prepared in the step S1 on the surface of a coal sample in a mine carbon dioxide aggregation area, standing for a period of time, fully adsorbing carbon dioxide in a downhole environment by the coal sample after treatment, and then spraying the carbon dioxide storage and fixation flame-retardant material prepared in the step S2 on the surface of the coal sample to generate a calcium carbonate precipitation layer so as to realize carbon dioxide adsorption storage and goaf pore blocking; the specific process of step S1 is as follows: S1-1, respectively preparing a 2-methylimidazole solution and a zinc nitrate solution, mixing and stirring the solutions according to equal volumes until the solutions are clear, standing and suction-filtering the solutions to obtain a white precipitate, and then washing the white precipitate with alcohol and drying the white precipitate to obtain ZIF-8 powder; s1-2, carbonizing ZIF-8 powder under the atmosphere of N 2 , repeatedly washing with dilute hydrochloric acid and deionized water, and drying to obtain ZIF-8 derivative porous carbon; S1-3, mixing ZIF-8 derived porous carbon, activated carbon and polyvinylidene fluoride, adding N, N-dimethylacetamide, and stirring and mixing uniformly to obtain black slurry, namely the carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid.
2. 2. The mine carbon dioxide adsorption, sealing and flame retarding method according to claim 1, wherein in the step S1-1, the concentration of the 2-methylimidazole solution is 0.8 mol/L, the concentration of the zinc nitrate solution is 0.15 mol/L, and in the step S1-3, the mass ratio of the ZIF-8 derived porous carbon, the activated carbon and the polyvinylidene fluoride is 9:1:1.
3. 3. The mine carbon dioxide adsorption sealing and flame retarding method of claim 1 is characterized in that in the step S2, mineralized bacteria liquid is prepared by mixing beef extract and peptone in a sterilizing container containing distilled water, stirring uniformly until the beef extract and the peptone are completely dissolved, standing at room temperature to obtain a basic culture medium, adjusting the pH of the basic culture medium to 6.5-8.5, adding urea solution into the culture medium to enable the concentration of urea to reach 25g/L, carrying out high-temperature sterilization treatment on the culture medium in an autoclave, inoculating the bacillus octajig, and culturing the inoculated culture medium in a constant-temperature shaking table at the temperature of 25 ℃ and the rotating speed of 180r/min for 36-60 hours to obtain mineralized bacteria liquid.
4. 4. The method for adsorbing, sealing and flame retarding carbon dioxide in a mine as claimed in claim 1, wherein in the step S2, mineralized bacteria liquid and saturated CaCl 2 solution/saturated calcium acetate solution are mixed according to a volume ratio of 1:1 to obtain the sealing, carbon fixing and flame retarding material.

Description

Mine carbon dioxide adsorption sealing and flame retarding method Technical Field The invention relates to the technical fields of underground carbon fixation, flame retardance and carbon dioxide adsorption and sealing, in particular to a method for mine carbon dioxide adsorption, sealing and flame retardance, which has important application in the aspects of mine gas adsorption, spontaneous combustion inhibition, safety protection, greenhouse gas treatment and the like. Background CO 2 adsorption and sequestration technology (CCS) is of great interest in industry, energy and mine, and is an effective means of reducing greenhouse gas emissions to the atmosphere. Currently, carbon dioxide capturing methods mainly include a chemical absorption method, a physical adsorption method, a membrane separation method, a low-temperature rectification method, and the like. However, in the complex closed environment of the mine, the problems of poor stability and easy desorption in the transportation process exist in the methods, so that the storage effect is poor and the trapping efficiency is low. Therefore, how to realize underground stable carbon fixation and reduce carbon dioxide emission caused by spontaneous combustion of coal, and radically reduce underground CO 2 emission while treating greenhouse gases, improve the safety of underground working environment, have important environmental protection and economic benefits, and are also key problems to be solved in the current coal industry. Disclosure of Invention The invention aims to provide a method for absorbing, sealing and flame-retarding carbon dioxide in a mine, which can realize stable carbon fixation and sealing of carbon dioxide in a goaf under the mine, effectively inhibit spontaneous combustion of underground coal and radically reduce emission of underground CO 2. In order to achieve the purpose, the invention provides a mine carbon dioxide adsorption, sealing and flame retarding method, which comprises the following steps: s1, preparing a carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid; S2, preparing a carbon-fixing and sealing flame-retardant material, namely mixing the prepared mineralized bacterial liquid, a saturated CaCl 2 solution/a saturated calcium acetate solution to obtain the carbon-fixing and sealing flame-retardant material; and S3, uniformly coating the carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid prepared in the step S1 on the surface of a coal sample in a mine carbon dioxide aggregation area, standing for a period of time, fully adsorbing carbon dioxide in a downhole environment by the coal sample after treatment, and then spraying the carbon-sequestration and carbon-fixation flame-retardant material prepared in the step S2 on the surface of the coal sample to generate a calcium carbonate precipitation layer so as to realize carbon dioxide adsorption sequestration and goaf pore blocking. Further, the specific process of step S1 is as follows: S1-1, respectively preparing a 2-methylimidazole solution and a zinc nitrate solution, mixing and stirring the solutions according to equal volumes until the solutions are clear, standing and suction-filtering the solutions to obtain a white precipitate, and then washing the white precipitate with alcohol and drying the white precipitate to obtain ZIF-8 powder; s1-2, carbonizing ZIF-8 powder under the atmosphere of N 2, repeatedly washing with dilute hydrochloric acid and deionized water, and drying to obtain ZIF-8 derivative porous carbon; S1-3, mixing ZIF-8 derived porous carbon, activated carbon and polyvinylidene fluoride, adding N, N-dimethylacetamide, and stirring and mixing uniformly to obtain black slurry, namely the carbon dioxide adsorption coating ZIF-8 derived porous carbon dispersion liquid. Preferably, in the step S1-1, the concentration of the 2-methylimidazole solution is 0.8mol/L, the concentration of the zinc nitrate solution is 0.15mol/L, and in the step S1-3, the mass ratio of the ZIF-8 derived porous carbon, the activated carbon and the polyvinylidene fluoride is 9:1:1. In the step S2, the mineralized bacteria liquid is prepared by mixing beef extract and peptone in a sterilizing container containing distilled water, stirring to be completely dissolved, standing at room temperature to obtain a basic culture medium, regulating the pH of the basic culture medium to be 6.5-8.5, adding urea solution into the culture medium to ensure that the urea concentration reaches 25g/L, sterilizing the culture medium in an autoclave at high temperature, inoculating Balanococcus bardans, and culturing the inoculated culture medium in a constant-temperature shaking table at 25 ℃ and the rotating speed of 180r/min for 36-60 hours to obtain the mineralized bacteria liquid. Preferably, in the step S2, the mineralized bacteria liquid and the saturated CaCl 2 solution/saturated calcium acetate solution are mixed according to the vol