A system and method for stable filling of goaf based on all-solid waste carbon reduction utilization

Abstract

The application discloses a kind of based on whole solid waste carbon reduction utilization's goaf stable filling system and filling method, the system includes biological preparation culture system, solid waste prefabrication system, gas injection system and goaf, the biological preparation culture system includes two incubators, and solid waste prefabrication system includes two prefabricators.Acid bacillus, arthrobacter are respectively added into two incubators and are respectively entered into two prefabricators after cultivation, steel slag is added into the prefabricator of acid bacillus bacterial solution, calcium carbide slag, granulated blast furnace slag are added into the prefabricator of arthrobacter bacterial solution, obtain two kinds of solid waste-biological bacterial solution mixture injection mineral resources goaf, pass in carbon dioxide-air mixed gas reaction, complete the stable filling of goaf.The present application is glued into the filling body with certain strength by microorganism carbon fixation mineralization reaction and solid waste pozzolanic reaction, not only effectively utilizes greenhouse gas carbon dioxide and industrial waste, but also realizes the safe treatment of mineral resources goaf.

Description

Technical Field

[0001] This invention relates to a system and method for stabilizing and filling goaf areas based on the carbon reduction and utilization of all solid waste, and belongs to the field of systems and methods for stabilizing and filling goaf areas based on the carbon reduction and utilization of all solid waste. Background Technology

[0002] my country has a vast territory and abundant mineral resources. Due to its rapid economic growth, the demand for resources is also substantial. Resource utilization is essential for development, and mineral resources are indispensable energy sources for my country's industrial development and essential means of production for human survival and development. This necessitates increased development of mineral resources. However, after most mineral extraction is completed, mining subsidence areas are formed, which have a certain impact on the surrounding geological conditions. The occurrence of geological disasters in mining subsidence areas leads to the deterioration of the ecological environment of the mining area and affects groundwater resources and rivers. Furthermore, it impacts surrounding buildings, bridges, and roads. Therefore, taking reasonable measures to manage mining subsidence areas is crucial.

[0003] Geological hazards in goaf areas are generally caused by the redistribution of stress in the overlying rock and soil layers after underground mining, so the treatment method is nothing more than goaf backfilling. According to the different backfill materials, they can be roughly divided into solid backfilling, paste backfilling, and ultra-high water content material backfilling. After decades of practical experience and research, scholars at home and abroad have achieved some important research results in this area. The development of mine goaf backfilling technology can be roughly summarized into four stages: waste rock and gangue backfilling, water-sand backfilling, tailings (sand) cemented backfilling, and high-concentration material cemented backfilling. Since the fourth stage, with the development of technology, cemented backfilling technology has achieved unprecedented development; people have gradually begun to study the properties of cemented backfill materials, their interaction mechanism with surrounding rock, pumping processes, etc. Goaf surface subsidence prevention technology has evolved from the earliest mechanical backfilling of waste rock and other materials to tailings backfilling, and then to paste and high-water content rapid-setting material backfilling, with backfilling efficiency continuously improving. In recent years, the emergence of delamination grouting methods has theoretically changed the previous grouting concept, leading to unprecedented development in goaf grouting treatment technology. However, this method is technically challenging and requires guidance from highly skilled technicians during production. Overall, existing methods for filling goafs in mineral resources suffer from numerous problems such as complex processes, high costs, and poor results, which urgently need to be addressed. Summary of the Invention

[0004] Purpose of the invention: The first purpose of this invention is to provide a system for stable filling of goaf areas based on carbon reduction and utilization of all solid waste; the second purpose of this invention is to provide a method for stable filling of goaf areas using this system.

[0005] Technical Solution: The present invention discloses a system for stable filling of goaf areas based on carbon reduction and utilization of all solid waste. The system comprises a biological agent cultivation system, a solid waste prefabrication system, an air injection system, and a goaf area. The biological agent cultivation system includes a first culturer, a second culturer, and a heating circulator. The solid waste prefabrication system includes a first prefabricator and a second prefabricator. The first culturer is connected to the second prefabricator via a pipeline, and the second culturer is connected to the first prefabricator via a pipeline. The first and second prefabricators are respectively connected to the goaf area via pipelines. The air injection system is connected to the goaf area.

[0006] The first incubator, the second incubator, the first preformer, and the second preformer are all jacketed structures. The heating circulator circulates the heating medium within the jacketed structures of the first incubator, the second incubator, the first preformer, and the second preformer. The gas injection system includes a carbon dioxide cylinder, an air cylinder, and a gas mixing tank. The carbon dioxide cylinder and the air cylinder are respectively connected to the gas mixing tank, and the gas mixing tank is connected to the goaf through a pipeline.

[0007] The key feature is that the bottoms of both the first preform and the second preform are inclined structures.

[0008] Both the carbon dioxide cylinder and the air cylinder are equipped with flow regulating valves. By controlling the flow rate through the flow regulating valves, carbon dioxide-air mixtures of different concentrations can be obtained.

[0009] Both the first and second culture vessels are equipped with stirrers.

[0010] Both the first preformer and the second preformer are equipped with a stirrer inside.

[0011] The gas mixing tank is connected to the goaf by a booster pump.

[0012] Concrete pumps are installed on the pipelines connecting the first and second precast units to the goaf.

[0013] A method for stably filling a goaf using the system described in this invention includes the following steps:

[0014] (1) Add Arthrobacter powder and water to the first culture vessel, add Acetobacter powder and water to the second culture vessel, circulate the heating medium through a heating circulator, control the culture temperature, and culture the biological agent to obtain two biological liquids: Acetobacter liquid and Arthrobacter liquid.

[0015] (2) The acetic acid bacteria solution is injected into the first preformer and the arthrobacterium solution is injected into the second preformer. The heating medium is circulated through the heating circulator. In the first preformer, steel slag and acetic acid bacteria solution are added and thoroughly stirred to obtain a solid waste-acetic acid bacteria solution mixture. In the second preformer, carbide slag, granulated blast furnace slag and arthrobacterium solution are thoroughly stirred to obtain a solid waste-arthrobacterium solution mixture. The solid waste-acetic acid bacteria solution mixture and the solid waste-arthrobacterium solution mixture are then injected into the goaf respectively.

[0016] (3) Carbon dioxide from carbon dioxide cylinders and air from air cylinders enter the mixing tank, where carbon dioxide-air mixture is obtained. The carbon dioxide-air mixture is injected into the goaf and reacts with the solid waste-acetic acid bacteria liquid mixture and the solid waste-arthrob bacteria liquid mixture to undergo a microbial carbon fixation mineralization reaction and a volcanic ash reaction of granulated blast furnace slag activated by carbide slag, cementing the solid waste to form a filler, thus achieving stable filling of the goaf.

[0017] In steps (1) and (2), the heating medium is circulating water.

[0018] In step (1), the mass ratio of acetic acid bacteria to deionized water is 1:5-1:10.

[0019] In step (1), the mass ratio of Arthrobacter to deionized water is 1:5-1:10.

[0020] In step (1), the culture temperature is 20-50℃.

[0021] In step (2), the volume ratio of the acetic acid bacteria solution to the steel slag is 1:5-1:10.

[0022] In step (2), the volume ratio of the Arthrobacter bacillus liquid to the carbide slag is 1:2-1:5.

[0023] In step (2), the volume ratio of the Arthrobacter bacillus liquid to the granulated blast furnace slag is 1:2-1:5.

[0024] In step (3), the ratio of air to carbon dioxide in the carbon dioxide-air mixture is 1:1 to 1:5.

[0025] In step (3), the volume ratio of the solid waste-acetic acid bacteria liquid mixture and the solid waste-arthrobacter liquid mixture is 1:1-1:3.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0027] (1) The Bacillus acetic acid culturing system of the present invention can effectively activate the calcium and magnesium activity in steel slag, and Artemisia annua can significantly increase the carbon dioxide reaction rate, activate mineralization coupling to form cementitious mineralization, and achieve efficient carbon dioxide fixation.

[0028] (2) After the calcium carbide slag of the present invention is fully mixed with granulated blast furnace slag, the calcium carbide slag can activate the pozzolanic reaction activity of the blast furnace slag to form hydrated calcium silicate, hydrated calcium aluminate, calcium hydroxide, etc., thereby improving the solidification strength of solid waste.

[0029] (3) Both the biological agent cultivation system and the solid waste pre-processing system are jacketed heating structures, which can provide suitable temperature conditions for the cultivation and mineralization of biological agents, and significantly improve the cultivation and mineralization efficiency.

[0030] (4) This invention forms a cementitious product through microbial carbon fixation and mineralization reaction and volcanic ash reaction of solid waste, which binds the solid waste into a filler with a certain strength. This not only effectively utilizes greenhouse gas carbon dioxide and industrial waste, but also achieves safe treatment of mining voids. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the system of the present invention. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0033] Example 1

[0034] like Figure 1 As shown, the present invention provides a system for stable filling of goaf based on carbon reduction utilization of solid waste, comprising a biological agent cultivation system 1, a solid waste prefabrication system 2, a gas injection system 3, and a reaction system 4 (simulating a goaf).

[0035] The biological agent cultivation system 1 includes a culture vessel 101, a culture vessel 102, and a heating circulator 117. The culture vessel 101 has a stirrer 103 inside, a feed inlet 105 at the top, and an outlet at the bottom. A shut-off valve 113 is located at the outlet and is connected to a peristaltic pump 115. The culture vessel 102 has a stirrer 104 inside, a feed inlet 106 at the top, and an outlet at the bottom. A shut-off valve 114 is located at the outlet and is connected to a peristaltic pump 116. Both culture vessels 101 and 102 are jacketed structures, namely jacketed structures 107 and 108. Jacketed structure 107 has an inlet 109 at the bottom and an outlet 110 at the top, while jacketed structure 108 has an inlet 111 at the bottom and an outlet 112 at the top. The heating circulator 117 has an outlet 118 at the bottom and an inlet 109 at the top. The outlet 118 is connected to the inlet 109 through a pipe, and the outlet 110 is connected to the inlet 111 through a pipe.

[0036] The solid waste prefabrication system 2 includes a prefabricator 201 and a prefabricator 202. Prefabricator 201 is equipped with a mixer 203, a feed inlet 205 at the top, and a discharge outlet 207 at the bottom. Prefabricator 202 is equipped with a mixer 204, a feed inlet 206 at the top, and a discharge outlet 208 at the bottom. Both prefabricators 201 and 202 are jacketed structures, namely jacket structure 209 and jacket structure 210. Jacket structure 209 has an inlet 211 at the bottom and an outlet 212 at the top. Jacket structure 2010 has an inlet 213 at the bottom and an outlet 214 at the top. Outlet 112 is connected to inlet 211 via a pipe, and outlet 212 is connected to inlet 213 via a pipe. Outlet 214 returns to the heating circulator 117 via inlet 119 through a pipe.

[0037] The gas injection system 3 includes a carbon dioxide cylinder 301, an air cylinder 302, and a gas mixing tank 308. The carbon dioxide cylinder 301 is connected to a pressure gauge 303 and a flow regulating valve 305. The air cylinder 302 is connected to a pressure gauge 304 and a flow regulating valve 306. Both the carbon dioxide cylinder 301 and the air cylinder 302 are connected to the gas mixing tank 308 through a valve 307. The gas mixing tank 308 is equipped with a pressure gauge 309. The mixed gas is injected into the reaction system 4 through a booster pump 310.

[0038] The reaction system 4 includes a reactor 401 simulating a mined-out area of ​​mineral resources. The reactor 401 has a top-mounted feed port 402, a feed port 403, an air injection port 404, a thermometer 405, and a pressure regulating valve 406. The reactor 401 has an electrically heated jacketed structure 407. A mixing tank 308 is connected to the air injection port 404 via a booster pump 310. The discharge port 207 is connected to the feed port 402 via a concrete pump 215, and the discharge port 208 is connected to the feed port 403 via a concrete pump 216.

[0039] A method for stabilizing and backfilling goaf areas based on the above system and utilizing all solid waste for carbon reduction:

[0040] (1) Powdered Arthrobacter and water are added to culture vessel 101 through feed port 105, and stirrer 103 is turned on to stir, resulting in Arthrobacter bacterial solution. Powdered Acetobacter and water are added to culture vessel 102 through feed port 106, and stirrer 104 is turned on to stir, resulting in Acetobacter bacterial solution. The heating medium flows out through outlet 118 of heating circulator 117, enters jacket structure 107 through inlet 109, flows out through outlet 110, and enters jacket structure 108 through inlet 111. The heating medium in jacket structure 108 flows out through outlet 112 and enters jacket structure 209 through inlet 211. The heating medium provides constant temperature conditions for the culture vessel, increasing the efficiency of biological agent culture. The Arthrobacter bacterial solution cultured in culture vessel 101 is pumped into pre-preparer 202 through peristaltic pump 115; the Acetobacter bacterial solution cultured in culture vessel 102 is pumped into pre-preparer 201 through peristaltic pump 116.

[0041] (2) Steel slag is added into the preformer 201 through the feed port 205, and the agitator 203 is turned on to stir it. It is thoroughly mixed with the injected acetic acid bacteria solution to obtain a solid waste-acetic acid bacteria solution mixture. The solid waste-acetic acid bacteria solution mixture is injected into the reactor 401 through the discharge port 207 and the feed port 402 via the concrete pump 215. Calcium carbide slag and granulated blast furnace slag powder are added into the preformer 202 through the feed port 206, and the agitator 204 is turned on to stir it. It is thoroughly mixed with the injected arthrobacterium to obtain a solid waste-arthrobacterium solution mixture. The solid waste-arthrobacterium solution mixture is injected into the reactor 401 through the discharge port 208 and the feed port 403 via the concrete pump 216. The heating medium in the jacket structure 209 flows out from the outlet 212 and enters the jacket structure 210 from the inlet 213. The heating medium within the jacket structure 210 flows out from outlet 214 and returns to the heating circulator 117 via inlet 119. The heating medium provides constant temperature conditions for the preformer;

[0042] (3) Adjust the flow regulating valve 305 and observe the pressure gauge 303 to allow carbon dioxide gas to enter the mixing tank 308 from the gas cylinder 301 through the valve 307. Adjust the flow regulating valve 306 and observe the pressure gauge 304 to allow air gas to enter the mixing tank 308 from the air cylinder 302 through the valve 307. The mixing tank 308 is equipped with a pressure gauge 309. Different concentrations of carbon dioxide-air mixtures are obtained in the mixing tank 308. The carbon dioxide-air mixtures are injected into the reactor 401 simulating the goaf area of ​​the mineral resources through the injection port 404 after passing through the booster pump 310. The efficiency of the carbon dioxide enzymatic mineralization reaction is improved by pressurization. Observe the thermometer 405 and control the temperature by electric heating in the jacket structure 407. The pressure in the reactor 401 is maintained by controlling the pressure regulating valve 406. The mineralization reaction of microbial carbon fixation and the pozzolanic reaction of calcium carbide slag-induced granulated blast furnace slag occur in the reactor 401. The cemented solid waste forms a filling body with a certain strength, realizing the stable filling of the goaf area.

[0043] Example 2

[0044] A filling experiment was conducted using the system and method described in Example 1:

[0045] (1) Add powdered biological agent Arthrobacter and deionized water to culture vessel 101 through feed port 105. The mass ratio of powdered biological agent Arthrobacter to deionized water is 1:10. Turn on stirrer 103 and culture for 24 hours to obtain Arthrobacter bacterial solution. Add powdered biological agent Acetic Acid Bacillus and deionized water to culture vessel 102 through feed port 106. The mass ratio of powdered biological agent Acetic Acid Bacillus to deionized water is 1:10. Turn on stirrer 104 and culture for 24 hours to obtain Acetic Acid Bacillus bacterial solution. The heating medium circulating water of jacket structure 107 enters from inlet 109 through outlet 118 of heating circulator 117, flows out from outlet 110 and enters jacket structure 108 through inlet 111. The heating medium circulating water of jacket structure 108 enters jacket structure 209 from outlet 112. The heating medium provides a constant temperature of 35°C for the culture vessel, thereby increasing the culture efficiency of biological agents. The Arthrobacter bacillus cultured in incubator 101 is pumped into pre-mixer 202 via peristaltic pump 115; the Acetobacter bacillus cultured in incubator 102 is pumped into pre-mixer 201 via peristaltic pump 116.

[0046] (2) Steel slag is added into the preformer 201 through the feeding port 205, and the agitator 203 is turned on to stir it, so that it is thoroughly mixed with the injected acetic acid bacteria solution to obtain a solid waste-acetic acid bacteria solution mixture. The volume ratio of acetic acid bacteria solution to steel slag is 1:5. The solid waste-acetic acid bacteria solution mixture is injected into the reactor 401 through the discharge port 207 and the feeding port 402 via the concrete pump 215. Calcium carbide slag and granulated blast furnace slag powder are added into the preformer 202 through the feeding port 206, and the agitator 204 is turned on to stir it, so that it is thoroughly mixed with the injected arthroblastus solution to obtain a solid waste-arthroblastus solution mixture. The mixture of bacteria and liquid, with a volume ratio of Bacillus arteriosus liquid to carbide slag and granulated blast furnace slag powder of 1:2:2, is injected into the reactor 401 via concrete pump 216 through discharge port 208 and then through feed port 403. The heating medium circulating water in the jacketed structure 209 of the preformer 201 enters from inlet 211 through outlet 112, flows out through outlet 212, enters the jacketed structure 210 through inlet 213, flows out through outlet 214, enters the heating circulator 117 through inlet 119, and the heating medium provides a constant temperature of 35°C for the preformer.

[0047] (3) Adjust the flow regulating valve 305 and observe the pressure gauge 303 to allow carbon dioxide gas to enter the mixing tank 308 from the gas cylinder 301 through the valve 307. Adjust the flow regulating valve 306 and observe the pressure gauge 304 to allow air gas to enter the mixing tank 308 from the air cylinder 302 through the valve 307. Observe the pressure gauge 309 of the mixing tank 308. A carbon dioxide-air mixture is obtained in the mixing tank 308, with an air-to-carbon dioxide ratio of 1:3. This mixture is injected into the reactor 401 simulating a mined-out area via the injection port 404 after passing through the booster pump 310. The volume ratio of the solid waste-acetic acid bacteria solution mixture and the solid waste-arthrobacter bacteria solution mixture is 1:1. The booster pump 310 improves the efficiency of the carbon dioxide enzymatic mineralization reaction. Observe the thermometer 405. The reaction temperature is controlled at 30℃ by electric heating within the jacket structure 407. The pressure inside the reactor 401 is maintained by controlling the pressure regulating valve 406. The reaction time is 7 days. Microbial carbon fixation and pozzolanic reaction of granulated blast furnace slag occur in the reactor 401, cementing the solid waste to form a filling material with a certain strength. The strength of the filling material is measured using a universal testing machine, and the strength is found to be 1.3 MPa, achieving stable filling of the mined-out area.

Claims

1. A system for stable filling of goaf based on carbon reduction utilization of total solid waste, characterized in that, The system comprises a biological agent culture system, a solid waste preparation system, a gas injection system and a goaf, the biological agent culture system comprises a first culture device, a second culture device and a heating circulator, the solid waste preparation system comprises a first preparation device and a second preparation device, the first culture device is connected with the second preparation device through a pipeline, the second culture device is connected with the first preparation device through a pipeline, and the first preparation device and the second preparation device are respectively connected with the goaf through pipelines, and the gas injection system is connected with the goaf; The first culture device, the second culture device, the first preparation device and the second preparation device are all jacketed structures, and the heating circulator circulates the heating medium in the jacketed structures of the first culture device, the second culture device, the first preparation device and the second preparation device; the gas injection system comprises a carbon dioxide cylinder, an air cylinder and a gas mixing tank, the carbon dioxide cylinder and the air cylinder are respectively connected with the gas mixing tank, and the gas mixing tank is connected with the goaf through a pipeline; The first culture device is added with bacillus amyloliquefaciens powder and water, and the second culture device is added with acetic acid bacillus powder and water, the heating circulator is used to circulate the heating medium, the biological agent is cultured, and two kinds of biological agent liquids, i.e., acetic acid bacillus liquid and bacillus amyloliquefaciens liquid, are obtained; the first preparation device is added with steel slag, the second preparation device is added with calcium carbide slag and granulated blast furnace slag, the acetic acid bacillus liquid is fully stirred with the steel slag to obtain a solid waste-acetic acid bacillus liquid mixture, and the bacillus amyloliquefaciens liquid is fully stirred with the calcium carbide slag and the granulated blast furnace slag to obtain a solid waste-bacillus amyloliquefaciens liquid mixture.

2. The system for stable filling of goaf based on carbon reduction using total solid waste according to claim 1, wherein, The bottom of the first preparation device and the second preparation device is in an inclined structure.

3. The system for stable filling of goaf based on carbon reduction using total solid waste according to claim 1, wherein, The carbon dioxide cylinder and the air cylinder are both provided with flow regulating valves, the flow is controlled through the flow regulating valves, and carbon dioxide-air mixed gas with different concentrations can be obtained.

4. The system for stable filling of goaf based on carbon reduction using total solid waste according to claim 1, wherein, The first culture device and the second culture device are both internally provided with stirrers.

5. The system for stable filling of goaf based on carbon reduction using total solid waste according to claim 1, wherein, The first preparation device and the second preparation device are both internally provided with stirrers.

6. The system for stable filling of goaf based on carbon reduction using total solid waste according to claim 1, wherein, A booster pump is arranged on the pipeline connecting the gas mixing tank with the goaf.

7. The system for stable filling of goaf based on carbon reduction using total solid waste according to claim 1, wherein, A concrete pump is arranged on the pipeline connecting the first preparation device and the second preparation device with the goaf.

8. A method of stabilizing a filled goaf with the system of any one of claims 1-7, characterized by, The method comprises the following steps: (1) bacillus amyloliquefaciens powder and water are added into the first culture device, acetic acid bacillus powder and water are added into the second culture device, the heating circulator is used to circulate the heating medium, the culture temperature is controlled, the biological agent is cultured, and two kinds of biological agent liquids, i.e., acetic acid bacillus liquid and bacillus amyloliquefaciens liquid, are obtained; (2) the acetic acid bacillus liquid is pumped into the first preparation device, the bacillus amyloliquefaciens liquid is pumped into the second preparation device, the heating circulator is used to circulate the heating medium, the steel slag in the first preparation device is fully stirred with the acetic acid bacillus liquid to obtain a solid waste-acetic acid bacillus liquid mixture, the calcium carbide slag and the granulated blast furnace slag in the second preparation device are fully stirred with the bacillus amyloliquefaciens liquid to obtain a solid waste-bacillus amyloliquefaciens liquid mixture, and the solid waste-acetic acid bacillus liquid mixture and the solid waste-bacillus amyloliquefaciens liquid mixture are respectively injected into the goaf; (3) The carbon dioxide in the carbon dioxide gas cylinder and the air in the air gas cylinder enter the mixing tank, and the carbon dioxide-air mixed gas is obtained in the mixing tank, the carbon dioxide-air mixed gas is injected into the goaf to react with the solid waste-acetobacter bacterial liquid mixture and the solid waste-arthrobacter bacterial liquid mixture to generate the mineralization reaction of microbial carbon sequestration, the pozzolanic reaction of calcium carbide slag activated granulated blast furnace slag, and the cementation of solid waste to form a filling body, thereby realizing the stable filling of the goaf.

9. The method of claim 8, wherein, In steps (1) and (2), the heating medium is circulating water, in step (1), the mass ratio of acetobacter to deionized water is 1:5-1:10, the mass ratio of arthrobacter to deionized water is 1:5-1:10, and the culture temperature is 20-50℃, in step (2), the volume ratio of acetobacter bacterial liquid to steel slag is 1:5-1:10, the volume ratio of arthrobacter bacterial liquid to calcium carbide slag is 1:2-1:5, and the volume ratio of arthrobacter bacterial liquid to granulated blast furnace slag is 1:2-1:

5.

10. The method of claim 8, wherein, In step (3), the volume ratio of the solid waste-acetobacter bacterial liquid mixture to the solid waste-arthrobacter bacterial liquid mixture is 1:1-1:3, and the ratio of air to carbon dioxide in the carbon dioxide-air mixed gas is 1:1-1:5.

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