CN116752194B - In-situ efficient electrolytic exploitation device and method for bauxite under middle-shallow coal - Google Patents
In-situ efficient electrolytic exploitation device and method for bauxite under middle-shallow coal Download PDFInfo
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- CN116752194B CN116752194B CN202311069696.9A CN202311069696A CN116752194B CN 116752194 B CN116752194 B CN 116752194B CN 202311069696 A CN202311069696 A CN 202311069696A CN 116752194 B CN116752194 B CN 116752194B
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- 239000003245 coal Substances 0.000 title claims abstract description 99
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 54
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 54
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910001610 cryolite Inorganic materials 0.000 claims abstract description 20
- 238000006479 redox reaction Methods 0.000 claims abstract description 20
- 238000005065 mining Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 73
- 239000007924 injection Substances 0.000 claims description 73
- 239000007789 gas Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/285—Melting minerals, e.g. sulfur
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/22—Collecting emitted gases
Abstract
The invention discloses an in-situ high-efficiency electrolytic exploitation device and method for bauxite under medium-shallow coal, belonging to the technical field of underground resource exploitation; aluminum is prepared by in-situ electrolysis of bauxite on the basis of a large amount of heat released by oxidation-reduction reaction of coal, so that the synergistic co-mining of coal and bauxite is realized; the invention realizes the common in-situ exploitation of the coal and the associated bauxite of the coal bed, and solves the problem of high exploitation difficulty of the underground aluminum mine of the coal; oxygen generated when the molten alumina-cryolite mixture is electrolyzed is fully utilized, so that the oxygen assists in carrying out oxidation-reduction reaction of the coal bed, closed-loop utilization of resources is formed, and the running cost of a system is saved; the influence on the underground ecological environment is minimum, and the underground water resource can be well protected; the invention is suitable for underground energy collaborative in-situ exploitation.
Description
Technical Field
The invention belongs to the technical field of underground resource exploitation, and relates to an in-situ efficient electrolytic exploitation device and method for bauxite under medium-shallow coal.
Background
The bauxite under the Shanxi stone coal-binary coal is widely distributed in the coal-containing stratum in full province, and the investigation and development of the aluminum under the coal are increasingly paid attention to due to the increasing exhaustion of the shallow bauxite resources. The middle and deep bauxite is gradually becoming the main direction of bauxite exploration and exploitation. Li Zhigang et al (Li Zhigang, yang Yanhong, ji Liuting; coal and aluminum co-occurrence resource co-development mode initial detection [ J ]. Coal engineering, 2017, 49 (10): 43-47) discuss coal and aluminum co-occurrence resource co-development modes under different resource conditions in Hedong coal fields, and three mining schemes are proposed according to the occurrence conditions of coal and aluminum. Wang Le (Wang Le, li Hainan, zhao Leiming, etc.; huang Huitou mining coal and aluminum co-production resource mining time sequence research [ J ]. Mining technology, 2018, 18 (3): 116-118) according to the resource occurrence condition of Huang Huitou mines, the scheme of 3 kinds of aluminum mine construction under coal is analyzed and compared, and the uplink mining scheme of coal and aluminum co-production is optimized. Yellow lead and the like (yellow lead, chen He, wang Chang and the like; research on bauxite mining method under coal-based stratum coverage [ J ]. Nonferrous metals (mine part), 2019, 71 (1): 1-4) propose a collaborative filling overlying rock control technology of aluminum under coal on the basis of industrial experiments.
Because the exploration and development of aluminum under coal is a complex system engineering, the exploration and development of aluminum under coal is influenced by various geological conditions, and geological problems faced in different stages of exploration, construction, production and pit closing of the coal mine are different. Based on the limitations of exploitation technology, exploration technology and the like, a plurality of coal beds are exploited at present, but associated bauxite at the lower part of the coal beds is not exploited or even explored, so that the problems of difficult maintenance of a roof, serious intrusion of underground water and the like are caused in the exploitation process of bauxite workers, and a plurality of technical problems are faced in the exploitation of bauxite at present.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides an in-situ high-efficiency electrolytic exploitation device and method for bauxite under medium-shallow coal, and solves the problem of high exploitation difficulty of aluminum under coal.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
In-situ high-efficiency electrolytic exploitation device for bauxite under middle-shallow coal is characterized in that a first injection well extending into a coal bed and a second injection well extending into a bauxite layer are arranged in a mining area, and positive and negative electrode devices extending into the bauxite layer are arranged; arranging a gas collecting well around the positive electrode, and arranging a gas-liquid collecting well around the negative electrode; the first injection well is respectively connected with the high-pressure hot water pipeline, the superheated steam pipeline and the oxygen pipeline, and the second injection well is respectively connected with the high-pressure hot water pipeline and the catalyst pipeline; the high-pressure hot water pipeline is used for conveying high-pressure hot water to the coal bed and the bauxite layer for hydraulic fracturing, the superheated steam pipeline is used for conveying superheated steam to preheat the coal bed, and the oxygen pipeline is used for conveying oxygen into the coal bed for oxidation-reduction reaction and heat release; the catalyst pipeline conveys the catalyst to the bauxite layer to reduce the melting point of alumina in the bauxite so as to obtain molten alumina; the positive and negative electrode devices electrolyze molten aluminum oxide, generated oxygen is collected through a gas collecting well, and generated elemental aluminum is collected through a gas-liquid collecting well.
Further, the gas collecting well is connected with the oxygen pipeline through an oxygen transmission pipeline and is used for inputting into the coal bed to perform oxidation-reduction reaction.
Further, the gas collecting well is respectively connected with a gas collecting device and an oxygen collecting device through pipelines; the gas-liquid collecting well is connected with a gas-liquid collecting device.
Further, the high-pressure hot water generating device is respectively connected with the first injection well and the second injection well through pipelines; the first injection well is also respectively connected with a low-pressure high-temperature superheated steam generating device and an oxygen generating device through pipelines; the second injection well is also connected with a cryolite particle generation device through a pipeline.
Further, the first injection well and the second injection well are disposed in a center of the mine; and positive and negative electrode devices are arranged around the first injection well and the second injection well serving as centers.
Further, the positive and negative electrode devices are arranged in at least two groups, each group comprising 2-5 positive electrodes and 2-5 negative electrodes; the positive electrodes and the negative electrodes of each group are radially and symmetrically distributed.
Further, a double well method or a double well method is adopted to arrange the first injection well and the second injection well; the double-well method is characterized in that a first injection well and a second injection well are respectively and independently arranged; the double-layer well method is characterized in that the injection well arranged in the coal bed and the bauxite layer is one well, physical separation is realized in a double-layer well mode, namely, the outer well is placed in the coal bed to form a first injection well, and the inner well is placed in the bauxite layer to form a second injection well.
An in-situ high-efficiency electrolytic exploitation method of bauxite under medium-shallow coal comprises the following steps:
1) Respectively carrying out hydraulic fracturing on the coal bed and the bauxite layer through the high-pressure hot water to generate cracks, and simultaneously enabling the high-pressure hot water to enter the coal bed;
2) Low-pressure high-temperature steam is introduced into the coal bed to fully preheat the coal bed; meanwhile, cryolite particles are injected into the bauxite layer by taking high-pressure hot water as a medium;
3) Injecting oxygen into the coal bed, so that coal, oxygen and water undergo oxidation-reduction reaction under the high-temperature condition to generate hydrogen and carbon dioxide, and recovering the hydrogen and the carbon dioxide; the large amount of heat generated by oxidation-reduction reaction further heats the coal bed and the bauxite layer positioned at the lower part of the coal bed, and the bauxite layer generates a mixture of molten aluminum oxide and molten cryolite under the action of cryolite particles and high temperature;
4) And (3) electrolyzing the mixture by using a positive electrode device and a negative electrode device to generate oxygen and elemental aluminum, and collecting the generated oxygen and elemental aluminum.
Preferably, the collected oxygen is sent to a coal seam for further use.
In the step 3), superheated steam and oxygen are continuously injected into the coal seam alternately, the oxidation-reduction reaction is continuously carried out, and all reaction gases are continuously collected and utilized.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, aluminum is prepared by in-situ electrolysis of bauxite on the basis of releasing a large amount of heat by a coal oxidation-reduction reaction, so that common in-situ exploitation of the coal and the associated bauxite of a coal bed is realized, and the problem of high exploitation difficulty of underground aluminum mining of the coal is solved.
2. The invention fully utilizes oxygen generated when the molten alumina-cryolite mixture is electrolyzed, so that the oxygen assists in carrying out oxidation-reduction reaction of the coal bed, closed-loop utilization of resources is formed, and the running cost of the system is saved.
3. Compared with other mining methods, the method provided by the invention has the advantages that the electrolytic method is used in bauxite mining, the influence on the underground ecological environment is small, and the underground water resource can be well protected. The method is also applicable to the field of collaborative in-situ exploitation of other underground energy sources.
Drawings
FIG. 1 is a cross-sectional view of the apparatus layout for dual well production in example 1.
FIG. 2 is a cross-sectional view of the apparatus layout for two-well production in example 2.
FIG. 3 is a schematic flow of cryolite particles injected into the second injection well of the twin well process of example 1.
Fig. 4 is a schematic flow direction of oxygen, high pressure hot water, etc. injected from the first injection well of the twin well method in example 1.
FIG. 5 is a schematic diagram of the flow direction of the injection process material in the double well injection well of example 2.
FIG. 6 is a schematic of a well layout of the double well method of example 2.
FIG. 7 is a schematic of a well layout of the twin well method of example 1.
Reference numerals in the drawings: 1-a gas collection device; 2-a gas collection well; 3-a high-pressure hot water generating device; 4-a low-pressure high-temperature superheated steam generating device; a 5-oxygen generating device; 6-cryolite particle generation device; 7-an anode electrode; 8-cathode electrode; 9-an oxygen collection device; 10-a gas-liquid collecting device; 11-a gas-liquid collection well; 12-a first injection well; 13-a second injection well; 14-formation; 15-coal seam; 16-bauxite layer; 17-oxygen transmission tube.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
Referring to fig. 1, 3, 4 and 7, the present embodiment provides an in-situ efficient electrolytic mining device and method for bauxite under medium-shallow coal.
Developing coal and aluminum resources under the coal by using a double-well method in bauxite under the coal with the distribution depth of 300m to 400m according to the distribution condition of aluminum under the coal in Shanxi province; the exploitation device adopted is specifically as follows:
drilling operation is carried out in a mining area center, a first injection well 12 extending into a coal seam 15 and a second injection well 13 extending into an bauxite layer 16 are arranged, and the first injection well 12 and the second injection well 13 are respectively and independently arranged; electrode devices extending into bauxite layers 16 are arranged around the first injection well 12 and the second injection well 13, two groups of electrode devices are arranged and distributed in a cross shape, and each group comprises 2 anode electrodes 7 and 2 cathode electrodes 8; the 2 anode electrodes 7 and the 2 cathode electrodes 8 are radially and symmetrically distributed on two sides of the first injection well 12 and the second injection well 13. Around the anode electrode 7, a gas collecting well 2 is arranged, and around the cathode electrode 8, a gas-liquid collecting well 11 is arranged.
The high-pressure hot water generating device 3 is respectively connected with the first injection well 12 and the second injection well 13 through pipelines and is used for respectively outputting high-pressure hot water to the first injection well 12 and the second injection well 13; the first injection well 12 is also respectively connected with a low-pressure high-temperature superheated steam generating device 4 and an oxygen generating device 5 through pipelines, and is respectively used for injecting low-pressure high-temperature superheated steam and oxygen into the first injection well 12; the second injection well 13 is further connected to a cryolite particle generator 6 for delivering cryolite particles via a pipeline. The gas collecting well 2 is respectively connected with a gas collecting device 1 and an oxygen collecting device 9 through pipelines and is used for collecting gases such as carbon dioxide, hydrogen and the like; the gas-liquid collecting well 11 is connected with a gas-liquid collecting device 10 for collecting elemental aluminum. The oxygen collection device 9 is connected with the oxygen generation device 5 through an oxygen transmission pipeline 17 and is used for being input into the coal seam 15 to carry out oxidation-reduction reaction.
The concrete mining method comprises the following steps:
1. the high-pressure hot water is generated by using the high-pressure hot water generating device 3, the high-pressure hot water is respectively injected into the coal seam 15 and the bauxite layer 16 through the first injection well 12 and the second injection well 13, and the injection of the high-pressure hot water has the effect of being used for fracturing, namely, cracks are manufactured in the coal seam 15 and the bauxite layer 16 in a hydraulic fracturing or horizontal well fracturing mode, the reaction area is increased for later reactions in the coal seam 15, and a flowing space is manufactured for cryolite particles injected later in the bauxite layer 16. The injection of high pressure hot water serves as a second purpose for the oxidation-reduction reaction of the coal seam.
2. Generating low-pressure high-temperature superheated steam by using the low-pressure high-temperature superheated steam generating device 4, injecting the low-pressure high-temperature superheated steam into the coal seam 15 through the first injection well 12, and fully preheating the coal seam 15; meanwhile, cryolite particles generated by the cryolite particle generator 6 are injected into the bauxite layer 16 through the second injection well 13 by taking high-pressure hot water as a medium.
3. Oxygen is generated by using the oxygen generating device 5, coal seam 15 is injected through the first injection well 12, oxidation reduction reaction is carried out on coal, oxygen and water under the high temperature condition, hydrogen and carbon dioxide are generated, and all reaction gases are collected and utilized by utilizing the gas-liquid collecting device 10 on the ground in combination with the gas collecting device 1. Meanwhile, a large amount of heat released by the oxidation-reduction reaction can heat the coal layer 15 to more than 800 ℃, so that conditions are created for the subsequent bauxite exploitation.
4. The low-pressure high-temperature superheated steam and oxygen are continuously generated by the low-pressure high-temperature superheated steam generating device 4 and the oxygen generating device 5, alternately injected into the coal seam 15 through the first injection well 12, the continuous oxidation-reduction reaction is advanced, and all the reaction gases are continuously collected and utilized by the gas-liquid collecting device 10 and the gas collecting device 1 on the ground. After oxygen is injected into the coal seam 15, the heat generated by the redox reaction will raise the temperature of the bauxite layer 16, and cryolite particles previously injected into the bauxite layer 16 will act as a catalyst to reduce the melting point of the alumina in the bauxite, thereby obtaining a mixture of molten alumina and molten cryolite.
5. The molten alumina-cryolite mixture is electrolyzed using anode electrode 7 and cathode electrode 8 to produce oxygen near the anode and liquid elemental aluminum near the cathode.
6. The oxygen and other gases generated by the anode are collected through the gas collecting well 2 and the oxygen collecting device 9 on the ground, and the generated oxygen is sent to the oxygen generating device 5 through the oxygen transmission pipe 17 after being processed, so that the closed-loop utilization of resources is realized, and the system cost is reduced.
7. The high-pressure hot water is generated by the high-pressure hot water generating device 3 and is injected into the bauxite layer 16 by the second injection well 13, so that underground liquid elemental aluminum is taken as a medium, enters the gas-liquid collecting device through the gas-liquid collecting well 11 and is carried to the ground, and is utilized after being treated.
Example 2
See fig. 2, 5 and 6; the embodiment provides an in-situ high-efficiency electrolytic exploitation device and method for bauxite under medium-shallow coal.
According to the distribution situation of aluminum under the Shanxi province coal, developing coal and aluminum resources under the coal by using a double-layer well method on bauxite under the coal with the distribution depth of 300m to 400m, wherein the specific steps are the same as those of the embodiment 1, and the difference is that a double-layer well method is adopted to arrange a first injection well 12 and a second injection well 13 in the embodiment; the thermal injection wells arranged in the coal seam 15 and the bauxite layer 16 are one well, and physical separation is realized in a double-layer well mode, namely, an outer well is placed in the coal seam 15 to form a first injection well 12, and an inner well is placed in the bauxite layer 16 to form a second injection well 13.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (10)
1. An in-situ high-efficiency electrolytic exploitation device for bauxite under middle-shallow coal is characterized in that a first injection well (12) extending into a coal bed (15) and a second injection well (13) extending into a bauxite layer (16) are arranged in a mining area, and positive and negative electrode devices extending into the bauxite layer (16) are arranged; a gas collecting well (2) is arranged around the positive electrode, and a gas-liquid collecting well (11) is arranged around the negative electrode; the first injection well (12) is respectively connected with a high-pressure hot water pipeline, a superheated steam pipeline and an oxygen pipeline, and the second injection well (13) is respectively connected with a high-pressure hot water pipeline and a catalyst pipeline; the high-pressure hot water pipeline is used for conveying high-pressure hot water to the coal bed (15) and the bauxite layer (16) for hydraulic fracturing, the superheated steam pipeline is used for conveying superheated steam to preheat the coal bed (15), and the oxygen pipeline is used for conveying oxygen to enter the coal bed (15) for oxidation-reduction reaction and heat release; a catalyst conduit delivers catalyst to the bauxite layer (16) to reduce the melting point of alumina in the bauxite to obtain molten alumina; the positive and negative electrode devices electrolyze molten aluminum oxide, generated oxygen is collected through a gas collecting well (2), and generated elemental aluminum is collected through a gas-liquid collecting well (11).
2. The in-situ high-efficiency electrolytic exploitation device for bauxite under medium and shallow coal according to claim 1, wherein the gas collecting well (2) is connected with the oxygen pipeline through an oxygen transmission pipeline (17) and is used for inputting into the coal bed (15) for oxidation reduction reaction.
3. The in-situ high-efficiency electrolytic exploitation device for bauxite under medium-shallow coal according to claim 1 is characterized in that the gas collecting well (2) is respectively connected with a gas collecting device (1) and an oxygen collecting device (9) through pipelines; the gas-liquid collecting well (11) is connected with a gas-liquid collecting device (10).
4. The in-situ high-efficiency electrolytic exploitation device for bauxite under medium-shallow coal according to claim 1 is characterized in that the high-pressure hot water generating device (3) is respectively connected with the first injection well (12) and the second injection well (13) through pipelines; the first injection well (12) is also respectively connected with a low-pressure high-temperature superheated steam generating device (4) and an oxygen generating device (5) through pipelines; the second injection well (13) is also connected with a cryolite particle generation device (6) through a pipeline.
5. The in-situ high-efficiency electrolytic mining device for bauxite under medium and shallow coal according to claim 1, wherein the first injection well (12) and the second injection well (13) are arranged at the center of a mining area; positive and negative electrode devices are arranged around the first injection well (12) and the second injection well (13) as the centers.
6. The in-situ high-efficiency electrolytic mining device for bauxite under medium-shallow coal according to claim 5, wherein at least two groups of positive and negative electrode devices are arranged, each group comprising 2-5 positive electrodes and 2-5 negative electrodes; the positive electrodes and the negative electrodes of each group are radially and symmetrically distributed.
7. The in-situ high-efficiency electrolytic exploitation device for bauxite under medium-shallow coal according to claim 5 is characterized in that a double well method or a double well method is adopted to arrange a first injection well (12) and a second injection well (13); the double-well method is characterized in that a first injection well (12) and a second injection well (13) are respectively and independently arranged; the double-layer well method is characterized in that the injection well arranged in the coal bed (15) and the bauxite layer (16) is one well, physical separation is realized in a double-layer well mode, namely, an outer well is placed in the coal bed (15) to form a first injection well (12), and an inner well is placed in the bauxite layer (16) to form a second injection well (13).
8. The method for in-situ high-efficiency electrolytic exploitation of the mid-shallow coal bauxite by adopting the in-situ high-efficiency electrolytic exploitation device of the mid-shallow coal bauxite according to claim 1 is characterized by comprising the following steps:
1) Respectively carrying out hydraulic fracturing on the coal bed (15) and the bauxite layer (16) through high-pressure hot water to generate cracks, and simultaneously enabling the high-pressure hot water to enter the coal bed (15);
2) Low-pressure high-temperature steam is introduced into the coal bed (15) to fully preheat the coal bed (15); meanwhile, cryolite particles are injected into the bauxite layer (16) by taking high-pressure hot water as a medium;
3) Injecting oxygen into the coal bed (15) to enable coal, oxygen and water to undergo oxidation-reduction reaction under the high temperature condition to generate hydrogen and carbon dioxide, and recovering the hydrogen and the carbon dioxide; the great amount of heat generated by oxidation-reduction reaction further heats the coal bed (15) and the bauxite layer (16) positioned at the lower part of the coal bed (15), and the bauxite layer (16) generates a mixture of molten aluminum oxide and molten cryolite under the action of cryolite particles and high temperature;
4) And (3) electrolyzing the mixture by using a positive electrode device and a negative electrode device to generate oxygen and elemental aluminum, and collecting the generated oxygen and elemental aluminum.
9. The in situ high efficiency electrolytic mining method for bauxite under medium shallow coal according to claim 8, wherein the collected oxygen is sent into a coal seam (15) for further use.
10. The method for in-situ high-efficiency electrolytic mining of bauxite under medium and shallow coal according to claim 8, wherein in step 3), superheated steam and oxygen are alternately injected into the coal seam (15), the continuous progress of the oxidation-reduction reaction is advanced, and all the reaction gases are continuously collected and utilized.
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