CN-122014338-A - Mine structural carbon storage unit construction method based on carbon mineralization collaborative filling technology

CN122014338ACN 122014338 ACN122014338 ACN 122014338ACN-122014338-A

Abstract

The invention provides a method for constructing a mine structural carbon storage unit based on a carbon mineralization synergistic filling technology, which belongs to the technical field of mining engineering and resource comprehensive utilization, and comprises the steps of mixing solid waste powder raw materials with a regulator solution, and introducing industrial waste gas containing CO 2 for carbon mineralization reaction to obtain mixed slurry; mixing the carbon mineralized solid product obtained by solid-liquid separation with tailings, water and cementing materials to obtain filling slurry, conveying the filling slurry to an underground goaf through a pipeline, and curing after filling is completed to form the mine structural carbon storage unit. According to the invention, the carbon mineralization reaction is coupled with mine filling, so that CO 2 is fixedly sealed in the microstructure of the filling body for a long time in a stable carbonate form, a carbon storage unit with a bearing function is formed, the carbon emission of a mining system is reduced from the source, and the safety and stability of an underground space are improved.

Inventors

SHAO ANLIN
ZHAO YINGLIANG
Yue Xingtong
SU BO
ZHANG SIQI

Assignees

北京科技大学

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (10)

1. The method for constructing the mine structural carbon storage unit based on the carbon mineralization collaborative filling technology is characterized by comprising the following steps of: S1, preprocessing solid waste, namely crushing and grinding the solid waste to obtain a powder raw material; s2, preparing a regulating agent solution, namely adding the regulating agent into water, and fully stirring until the regulating agent is completely dissolved to obtain the regulating agent solution; S3, rapid carbon mineralization treatment, namely mixing the powder raw material obtained in the step S1 with the regulator solution obtained in the step S2, injecting the mixture into a rapid carbon mineralization device, introducing industrial waste gas containing CO 2 , and carrying out carbon mineralization reaction to obtain mixed slurry; S4, carrying out solid-liquid separation on the carbon mineralized slurry, namely carrying out solid-liquid separation on the mixed slurry obtained in the step S3 to obtain a carbon mineralized solid product; s5, preparing a filling material, namely mixing the carbon mineralized solid product obtained in the step S4 with tailings, water and a cementing material, and uniformly stirring to obtain filling slurry; s6, conveying filling slurry, namely conveying the filling slurry obtained in the step S5 to an underground goaf through a filling station and a pipeline; And S7, forming the mine structural carbon storage unit, namely after filling slurry is injected into the goaf and filling is completed in S6, curing and solidifying to form the mine structural carbon storage unit.
2. The method for constructing a mine structural carbon storage unit based on a carbon mineralization synergistic packing technology according to claim 1, wherein in step S1, the solid waste is a solid waste with carbon mineralization activity, which is rich in an alkaline or Ca/Mg active phase that can react with CO 2 .
3. The method for constructing A mine structural carbon storage unit based on the carbon mineralization synergistic filling technology according to claim 2, wherein in the step S1, the solid waste is selected from one or more of calcium oxide, calcium hydroxide, magnesium oxide, magnesium hydroxide, C-S-H gel, C-A-S-H gel, hydrotalcite-like compound, calcium silicate, calcium aluminate, calcium aluminoferrite, calcium sulfoaluminate, calcium fluoroaluminate, magnesium silicate mineral, waste concrete sand powder, steel slag, garbage incineration bottom ash or fly ash, red mud, and magnesium silicate rich tailings.
4. The method for constructing a mine structural carbon storage unit based on the carbon mineralization synergistic filling technology according to claim 1, wherein in the step S2, the regulating agent is one or more selected from the group consisting of sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, sodium silicate, potassium silicate, ammonia water, ammonium nitrate, ammonium chloride, calcium chloride, magnesium sulfate, aluminum hydroxide, fine calcium carbonate, magnesium carbonate seed crystal, sodium chloride, potassium chloride, sodium hexametaphosphate, lignin sulfonate dispersant, polycarboxylate water reducer, polyacrylamide, polyacrylic acid, triethanolamine, alcohol amine, organosilicon defoamer, carbonic anhydrase or bionic catalyst thereof.
5. The method for constructing a mine structural carbon storage unit based on the carbon mineralization synergistic filling technology according to claim 1, wherein in the step S2, the molar concentration of the regulator solution is 0.001-1.0 mol/L.
6. The method for constructing a mine structural carbon storage unit based on the carbon mineralization synergistic filling technology according to claim 1, wherein in the step S3, the liquid-solid weight ratio is 0.2:1-30:1, preferably 1:1-10:1.
7. The method for constructing a mine structural carbon storage unit based on the carbon mineralization collaborative filling technology according to claim 1, wherein in the step S3, the carbon mineralization temperature is 20-100 ℃, preferably 20-60 ℃, and the mineralization time is 10-60 min.
8. The method for constructing a mine structural carbon storage unit based on the carbon mineralization synergistic filling technology according to claim 1, wherein in the step S3, the carbonized gas is industrial tail gas containing CO 2 , and the volume percentage of CO 2 in the industrial tail gas is more than or equal to 5%; and/or the ventilation speed of the industrial tail gas is 0.05-2.0L/min/g of solid.
9. The method for constructing a mine structural carbon storage unit based on the carbon mineralization synergistic filling technology according to claim 1, wherein in the step S5, the cementing material is selected from one or more of Portland cement and clinker, aluminate cement and clinker, sulphoaluminate cement and clinker, aluminoferrite cement and clinker, fluoroaluminate cement and clinker, and other industrial waste residues or cements optionally composed of calcium silicate, calcium aluminate, calcium aluminosilicate or calcium sulfoaluminate as main minerals, and various cementing materials composed of wastes.
10. The method for constructing the mine structural carbon storage unit based on the carbon mineralization collaborative filling technology, which is characterized in that in the step S5, the weight ratio of the solid product after the carbon mineralization treatment, the tailings and the cementing material is (10-30): (50-70): (5-20).

Description

Mine structural carbon storage unit construction method based on carbon mineralization collaborative filling technology Technical Field The invention belongs to the technical field of mining engineering and comprehensive utilization of resources, and particularly relates to a method for constructing a mine structural carbon storage unit based on a carbon mineralization collaborative filling technology. Background With the advancement of global climate control, mining industry is used as an energy and resource consumption intensive industry, the whole process (exploration, exploitation, transportation, tailing treatment and related primary processing) is accompanied by a large amount of energy consumption and greenhouse gas emission, and meanwhile, a large amount of solid wastes such as tailings, waste stones and metallurgical slag are continuously accumulated, so that resource waste and ecological risks coexist. For this reason, there is a need to drive the mining industry from high carbon emissions to a direction with potential carbon sink functionality. Filling mining is considered as an important path for realizing green low-carbon mining, and related processes comprise taking solid wastes such as tailings and the like as raw materials, proportioning and pulping and backfilling the solid wastes into an underground goaf, so that the ground pressure can be controlled, the recovery rate can be improved, and the reduction and recycling of the solid wastes can be facilitated. However, the existing filling system has high dependence on cement in the cementing material link, and cement production is an important source of CO 2 emission, so that the contradiction of 'treating waste with waste but resisting high carbon' is formed. It is worth noting that the metallurgical slag and the super-basic tailings which are rich in calcium and magnesium minerals in the solid waste have higher carbon mineralization potential, can react with CO 2 to generate carbonate minerals with thermodynamic stability, realize long-term solid sealing, and form a reaction product with certain cementation and structural strength. Based on this, related art paths for introducing a carbon mineralization process into a mine filling system have been developed in recent years. In the prior art, the method related to carbon mineralization filling can be mainly classified into three types, namely, after filling is completed in a goaf or a roadway, CO 2 is injected underground to enable a filling body to carry out in-situ carbonization reaction, CO 2 is introduced into a pulping process or an aqueous phase system in a filling material preparation stage, and a material with a carbon fixing function is prepared through a chemical leaching-remineralizing mode. However, the technical path generally has the problem that the coupling degree between the reaction stage and the filling system is higher, the underground gas injection mode needs to be matched with a complex sealing and pipeline system, the construction risk and the cost are higher, and introducing CO 2 into a pulping or water-phase system easily causes the pH of the system to be suddenly reduced, so that the hydration reaction of cement is inhibited, and the final strength and the stability of the filling body are further affected. Meanwhile, in the path, the carbon mineralization reaction object often acts on the whole slurry or a space system without distinction, and fine regulation and control on the carbon immobilization process are difficult. In addition, for the technical path adopting the chemical leaching-remineralizing mode, the carbon mineralization is usually realized by dissolving, migrating and reprecipitating calcium and magnesium active components in the solid waste, the process flow of the method usually involves multi-step chemical treatment and solid-liquid separation operation, the flow is relatively complex, the requirements on medicament consumption and process control are high, and a certain difficulty exists in engineering continuity and large-scale application. Therefore, how to directly introduce CO 2 in the filling pulping stage without depending on underground gas injection and on the premise of dissolving, transferring and reprecipitating and reconstructing active components of solid waste, realize high-efficiency carbon mineralization treatment with solid waste particles as a reaction main body, and stably introduce the solid waste particles into a mine filling system, so that a mine structural carbon storage unit with engineering bearing function and long-term carbon sealing capability is still to be further researched and solved. Disclosure of Invention The invention provides a method for constructing a mine structural carbon storage unit based on a carbon mineralization collaborative filling technology, which comprises the following steps: before mine filling pulping, solid waste particles are taken as a reaction main body, and are placed in an independent ca