CN114961845A - Goaf carbon sealing method based on stratified approach tailing cemented filling mining - Google Patents
Goaf carbon sealing method based on stratified approach tailing cemented filling mining Download PDFInfo
- Publication number
- CN114961845A CN114961845A CN202210690965.2A CN202210690965A CN114961845A CN 114961845 A CN114961845 A CN 114961845A CN 202210690965 A CN202210690965 A CN 202210690965A CN 114961845 A CN114961845 A CN 114961845A
- Authority
- CN
- China
- Prior art keywords
- filling
- sealing
- approach
- mining
- goaf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005065 mining Methods 0.000 title claims abstract description 93
- 238000007789 sealing Methods 0.000 title claims abstract description 92
- 238000013459 approach Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 80
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 46
- 230000009919 sequestration Effects 0.000 claims abstract description 40
- 239000010878 waste rock Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000011435 rock Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 230000007774 longterm Effects 0.000 claims abstract description 6
- 239000004567 concrete Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000002956 ash Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000006703 hydration reaction Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000036571 hydration Effects 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010426 asphalt Substances 0.000 claims description 4
- 230000033558 biomineral tissue development Effects 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000009933 burial Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 7
- 239000001569 carbon dioxide Substances 0.000 abstract description 7
- 230000001965 increasing effect Effects 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 9
- 239000004571 lime Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000001089 mineralizing effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000011278 co-treatment Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to a goaf carbon sequestration method based on stratified approach tailing cemented filling mining, and belongs to the field of carbon dioxide sequestration of metal mines. Mining the side wall of the current layered ore body according to a return-font approach, and sealing the side walls except the connecting roadway by using an airtight material; mining internal ore bodies by a layering approach filling method, filling reserved empty areas at intervals by using a tailing cemented filling body by a downward layering method, and filling the reserved empty areas at intervals by using the tailing cemented filling body and waste rocks by an upward layering method; after the current layering operation is finished, CO from an empty area or a waste rock filling area to a sectional transportation roadway is erected in a connecting roadway 2 The pipeline is used for sealing the communication lane by using an airtight material; when the current middle section operation is finished, the trapped CO is 2 Injecting the CO into a dead zone or a waste rock filling zone through a pipeline arranged along a return air path, wherein the CO is increased along with the mining depth and the ground temperature 2 With gasAnd (5) long-term sealing from the state to the supercritical state. The method is simple to operate and low in cost, and has important significance for sustainable utilization of underground space of the mine and green mining.
Description
Technical Field
The invention relates to a goaf carbon sequestration method based on stratified approach tailing cemented filling mining, and belongs to the field of carbon dioxide sequestration of metal mines.
Background
At present, the main places for geological utilization and sequestration of carbon dioxide are deep saline layers and oil-gas fields; the oil-gas field mainly carries out oil displacement/gas production increase, and the storage amount is small; deep saline water layer has great potential for sequestration, but available CO 2 The sealing space is only 2-3%, and the well construction cost is huge. By 2050, CO 2 Sequestration capacity will need to increase from about 4000 to over 56 million metric tons per year, potentially requiring capital investment of approximately $ 1.3 trillion, depending on conventional geological resources such as deep salt water layers, oil and gas fields, and the like. This gives a search for low cost, large scale CO 2 The sealing field provides challenges and creates new opportunities.
The total goaf of the metal-nonmetal (non-coal) underground mine of China is 12.8 hundred million m by the end of 2015 3 About 72 hundred million m of underground space resources of abandoned coal mine in 2020 3 . Fully utilizes mine goaf resources as CO 2 Underground sealing and storage service, and is expected to greatly improve CO 2 Sealing capability and reducing sealing cost. Due to the coal bed to CO 2 Has a certain adsorption capacity and CO 2 Has the functions of displacing and increasing coalbed methane, and the goaf carbon sequestration is greatly researched in the field of coal mining, such as a method for storing carbon dioxide gas in a porous medium filled goaf, publication No. CN110344877A), and a method for sequestering CO by using a coal mine abandoned mine goaf 2 The method of (1) No. CN109812293A, a method for filling mining and constructing goaf reservoir without isolation coal pillar, No. CN114412464A, CO utilization by mineralization 2 A waste gas ecological protective coal mining method, publication No. CN 113622993A; however, the device is not suitable for use in a kitchenAnd CO which can be sequestered by coal bed adsorption 2 The content is less, the surrounding rock of the coal mine is relatively broken, a large number of goafs collapse after mining, the plugging difficulty of the goafs is high, and CO is easily caused 2 And (4) leakage. The stability of the surrounding rock of the metal mine is generally higher than that of the coal mine, and the tailing cemented filling mining method has the functions of goaf treatment, ground pressure control, surface subsidence control and tailing disposal, and is widely applied to the metal mine. This creates good conditions for carrying out the local filling carbon sealing storage of the goaf in the underground metal mine.
The tailing cemented filling body is a slurry which is formed by mixing water, cement, tailing and additives and has certain fluidity, the slurry is conveyed to a goaf, and after a period of hydration reaction, the slurry is consolidated into an artificial medium body with certain strength. The main components of the filling body are hydration products and tailing minerals, and CO is generated in the environment without underground water erosion 2 With the hydration product, CO, as shown in formula 1 2 The reaction with basic tailing minerals as shown in the formula 2 can generate high-strength CaCO 3 And silica gel SiO with gelling effect 2 ·nH 2 O, thereby reducing the porosity of the filling body, improving the overall strength of the filling body and gradually enhancing the sealing property of the filling body.
(Ca,Mg) x Si y O x+2y+z H 2z (s)+xCO 2 (g)→x(Ca,Mg)CO 3 (s)+ySiO 2 ·zH 2 O(am)
Method for cemented filling by tailing carbonization (authorized notice number CN113213829B) by utilizing CO 2 The reaction mechanism with the filling body is that CO is introduced into the pipeline embedded in the filling body 2 Method for mineralizing and curing a filling body, but this method does not provide CO 2 Sealing space, CO which can be sealed in short time by only mineralizing and fixing carbon 2 The amount is small, and the emission reduction efficiency is low.
In addition, a method for storing carbon dioxide gas in the goaf filled with the porous medium (authorization notice number CN110344877B), a method for storing carbon dioxide gas in the goaf filled with the porous mediumMethod for sealing and storing CO in goaf of abandoned coal mine 2 The method (the publication number is CN109812293A is not authorized), a method for filling mining and constructing a goaf reservoir without an isolation coal pillar (the publication number is CN114412464A is not authorized), and CO is utilized by mineralization 2 Although a series of patents such as a waste gas ecological protective coal mining method (which is not authorized by the publication number CN 113622993A) and the like propose a method for reserving a dead zone, the method aims at a thin-layer horizontal (or slowly inclined) ore body such as a coal mine, a metal ore deposit is generally steeply inclined and greatly extends in the depth direction, and the mining method is greatly different from coal mining. Moreover, the method (No. CN110344877B) for storing carbon dioxide gas in the goaf filled with the porous medium adopts the process flow of pouring the porous medium filler by a mould and then building the filling strip, which can not be realized by the existing filling system. Therefore, the above invention is not suitable for the carbon sequestration of the goaf of the metal mine.
Disclosure of Invention
Aiming at the defects of the prior art, the safe and low-cost method for sealing and storing the carbon in the tailings cemented local filling goaf by combining carbon emission reduction and goaf filling treatment is provided, and the tailings cemented filling body is used for locally filling the goaf to construct CO in the underground metal ore 2 Long term sequestration of sites while utilizing CO 2 Reacting with tailing cemented filling body to remove CO 2 The carbon fiber is permanently fixed in the filling body, so that the atmospheric carbon emission is reduced, the strength of the filling body can be improved, and the stability of an underground space is maintained. In addition, the invention is combined with a layered access filling mining method commonly adopted by metal ore mining, does not need to change the original filling system of the mine, is easy to realize and has less additional cost expenditure.
In order to achieve the technical purpose, the invention discloses a goaf carbon sealing method based on stratified approach tailing cemented filling mining, which comprises the following steps:
on the basis of stratified approach tailing cemented filling mining, a sealing layer is built on the boundary of an ore body of a metal ore by using an airtight material to seal the whole goaf, a high-strength tailing cemented filling body on a side wall, an artificial false roof or an artificial false bottom and a tailing cemented filling body filled in the goaf at intervals are used for supporting an integral framework of the goaf, and CO is reserved in the goaf according to the on-site condition 2 Sealing off dead zones or highly porous CO 2 Sealing waste rock filling area, carbon sealing initial stage using pipeline to CO 2 Sealing off empty areas or CO 2 Filling CO into the waste rock sealing and storing filling area 2 By means of gas-tight material at the boundary of the ore body 2 Sealed in the goaf, along with CO sealed in the goaf 2 Diffusing into the tailing cemented filling body to react with basic tailing and cement hydration products in the tailing cemented filling body, consuming CO 2 While simultaneously generating high-strength calcium carbonate CaCO 3 And silica gel SiO with gelling effect 2 ·nH 2 O, thereby improving the overall strength and the air tightness of the tailing cemented filling body, reducing the porosity of the tailing cemented filling body and realizing large-scale, long-term and safe carbon sealing;
the method comprises the following specific steps:
Furthermore, the middle section, segmentation and layering of the ore body are divided in the mining process, and the mining and filling sequence along the depth direction of the ore body is completely consistent with that of a layering access filling mining method; the layered approach is divided into a slope approach and an ore body internal approach on the boundary of surrounding rocks and ore bodies, the operation mode of the layered approach is to mine and seal the slopes according to the square-shaped sequence, mine and fill the internal approach according to the principle that the two slope approaches of the ore body are gradually pushed to the approach in the middle of the ore body, and if the two slope approaches meet the requirement, CO is reserved 2 Sealing off dead zones or highly porous CO 2 The approach of the waste rock filling area is sealed, the approach is skipped first, the next approach is mined and filled, and when CO is required to be reserved 2 Sealing off dead zones or high porosity CO 2 After the two side routes of the route of the waste rock sealing and filling area are filled, the route is mined and left empty or waste rock is filled to form CO 2 Sealing off dead zones or highly porous CO 2 And sealing and storing the waste rock filling area.
Further, the method for sealing the side walls except the connecting roadway by using the airtight material comprises the following steps: filling the outer side of the slope approach close to the surrounding rock by using a high-strength tailing cemented filling body, filling the inner side of the slope approach close to the ore body by using an airtight material, and reserving 1/10 slope approach width between the airtight material and an internal undeployed block as an isolation space for ore caving impact to protect the filling bodies and the sealing material on the two sides; the method for sealing the side connecting lane by using the airtight material comprises the following steps: and filling the inner side of the side, close to the ore body, of the layered connection roadway with an airtight material, filling the outer side of the side, close to the surrounding rock, of the layered connection roadway with a high-strength tailing cemented filling body, and filling all the connection roadways of the stope with the tailing cemented filling body.
Further, an airtight artificial false roof and an airtight artificial false bottom are required to be arranged on the top part layer and the bottom part layer of the ore body respectively, when a downward layering approach filling method is selected for mining, an airtight artificial false roof is required to be arranged on the top of each middle section, if an upward layering approach filling method is selected for mining, an airtight artificial false bottom is required to be arranged on the bottom of each middle section, and a stable carbon sealing unit structure taking the middle section as a unit is formed by combining an airtight artificial false roof and an airtight artificial false bottom with a side wall and a high-strength tailing cemented filling body.
Further, captured CO 2 From four discharge sources of electric power, cement, steel and chemical industry; captured CO 2 Through surface CO arranged near the return air shaft 2 The pump station is connected to the CO at the junction of the segmented transportation roadway and the stope connecting roadway along the return air shaft and the return air roadway through pipelines 2 Pipeline of CO 2 Injecting into dead zone or waste rock filling zone to avoid CO 2 The leakage of the pipeline pollutes the fresh and fresh air flow.
Further, CO 2 CO of pipeline 2 The conveying pressure is controlled to maintain the stability of the side air-tight material and the high-strength tailing cemented filling body and simultaneously locally tear CO 2 Sealing off dead zone or CO 2 Level of tailings cemented filling body around the sealing waste rock filling area, wherein gaseous CO 2 The pressure can be lower than 1MPa, the method is suitable for a goaf with the ore body burial depth of less than 100m and low ground stress and surrounding rock strength in the initial mining period, and the filled CO can be gradually improved along with the increase of the mining depth, the ground stress and the surrounding rock strength 2 Pressure, when the ground temperature of the stratum where the goaf is located is more than 31 ℃ and the mining depth is more than 800m, the supercritical state CO sealing and storage is considered 2 。
Further, CO near the junction of stope connecting roadway and segment haulage roadway 2 The pipeline is provided with CO 2 A pressure sensor, a gas-tight valve and a flange interface; when CO is present 2 After the injection operation is finished, the airtight valve is closed, the flange connector is loosened, and then the flange is used for sealing the connector to block CO 2 Sequestration zone or CO 2 Sealing the communicated pipeline of the waste rock filling area and conveying CO on the current segmental transportation lane 2 The pipeline is recovered on the next subsection transportation lane for reuse and is subjected to CO treatment on the ground surface 2 Pumping station to other CO in current section 2 The pipeline is kept still and extends downwards to the next section; CO 2 2 Pressure sensor monitoring CO during sequestration 2 Sealing off empty areas or CO 2 Sequestration of CO in waste rock fill zones 2 The pressure changes.
Further, one CO is arranged in the surrounding rock near the ore body side wall at intervals of one subsection height distance 2 Concentration sensor for CO 2 Leakage early warning; if there is no significant CO during the sealing period 2 Leakage and detection of CO 2 Sealing off empty areas or CO 2 Sealing off CO in waste rock filling area 2 The slow drop in the pressure sensor reading indicates CO 2 With the filler undergoing a mineralization reaction when CO 2 The pressure is reduced to 75% of the set pressure, and the CO can be reconnected by using the airtight valve and the flange interface 2 The gas source is CO 2 Sealing off empty areas or CO 2 And (5) sealing and storing the filling area of the waste rocks for pressure supplement.
Furthermore, the tailing cemented filling slurry used by the tailing cemented filling body comprises mine tailing, Portland cement or fly ash, steel slag composite portland cement, water and an additive, the concentration of the filling slurry is more than 70 percent, and the 3d strength is more than 1 MPa; the mass ratio of the sand to the ash in the tailing cemented filling body used in the downward layered filling method is more than 1: 6, 28d strength is more than 3.5 MPa; the mass ratio of the sand to the ash in the tailing cemented filling body of the upward layered filling method is more than 1: 8, 28d strength is more than 2 MPa; the mass ratio of the ash to the sand in the high-strength tailing cemented filling body outside the filling side entry road and the layered connection roadway is more than 1: the 4 and 28d strength is more than 5 MPa.
Further, the airtight material comprises airtight concrete, asphalt-based airtight filler and mining filling airtight material; the air-tight artificial false roof and the air-tight artificial false bottom comprise air-tight concrete, a composite structure of concrete and asphalt-based air-tight filling materials and a composite structure of concrete and mining filling sealing materials.
Has the beneficial effects that:
the method has the following technical advantages that 1) the tailing cemented filling body is utilized to partially fill the goaf to construct CO in the underground metal ore 2 Sealing off the place to realize CO 2 Efficient, large-scale, long-term physical sequestration; 2) by using CO 2 Reacting with the tailings cemented filling body to remove CO 2 Fixed in a filling body to realize CO 2 Permanent, stable chemical sealing; 3) by using CO 2 The reaction with the tailing cemented filling body gradually reduces the porosity of the filling body, improves the strength of the filling body, and ensures the stability of the underground space and the sealing structure; 4) stratification common with metal miningThe combination of the access filling mining method does not need to change the original filling system of the mine, is easy to realize, and has less additional cost expenditure.
Drawings
FIG. 1(a) is a schematic plan view of a downward layered filling mining gob carbon sequestration along the trend of an ore body;
FIG. 1(b) is a schematic view of a section along the thickness of an ore body for carbon sequestration in a downward stratified filling mining gob;
FIG. 2(a) is a schematic representation of a carbon sequestration mining and packing sequence for the D1-D1 sectioned region of FIG. 1(b) utilizing the goaf carbon sequestration method of the present invention based on stratified approach tailing cemented fill mining;
FIG. 2(b) is a schematic illustration of a carbon sequestration mining and packing sequence for the section area E1-E1 of FIG. 1(b) utilizing the goaf carbon sequestration method of the present invention based on stratified approach tailing cemented fill mining;
FIG. 3(a) is a schematic plan view of carbon sequestration along the trend of an ore body in an upward layered filling mining gob;
FIG. 3(b) is a schematic view of a section along the thickness of an ore body for carbon sequestration in an upward stratified filling mined area;
FIG. 4(a) is a schematic illustration of a carbon sequestration mining and packing sequence for the D2-D2 sectioned region of FIG. 3(b) utilizing the goaf carbon sequestration method of the present invention based on stratified approach tailing cemented fill mining;
FIG. 4(b) is a schematic representation of a carbon sequestration mining and filling sequence for the E2-E2 sectioned area of FIG. 3(b) utilizing the goaf carbon sequestration methods of the present invention based on stratified approach tailing cemented fill mining;
in the figure: 1. a gas-tight material; 2. CO 2 2 Sealing and storing the empty area; 3. CO 2 2 Sealing a waste rock filling area; 4. cementing a filling body by using tailings; 5. high-strength tailings cemented filling; 6. an air-tight artificial false roof; 7. an air-tight artificial false bottom; 8. a segmented transportation lane; 9. CO 2 2 A pipeline; 10. a stope communication lane; 11. layered connection lanes; 12. an ore body.
Detailed Description
In order to more clearly illustrate the technical means and methods adopted by the present invention, the following description will further explain embodiments of the present invention with reference to the accompanying drawings.
The invention relates to a goaf carbon sealing method based on stratified approach tailing cemented filling mining, which is characterized in that on the basis of the stratified approach tailing cemented filling mining, a sealing layer is built on the boundary of an ore body 12 of a metal ore by using an airtight material 1 to seal the whole goaf, a goaf integral frame is supported by using a high-strength side tailing cemented filling body 5, an artificial false roof 6 or an artificial false bottom 7 and a tailing cemented filling body 4 filled in the goaf at intervals, and CO is reserved in the goaf according to the field condition 2 Sequestration of 2 or highly porous CO in the dead zone 2 Sealing waste rock filling area 3, carbon sealing initial stage using pipeline to CO 2 Sealing of 2 or CO in the empty space 2 Filling CO into the sealed waste rock filling area 3 2 By means of a gas-tight material 1 at the boundary of the ore body 12 for CO 2 Sealed in the goaf, along with CO sealed in the goaf 2 Diffuses into the tailing cemented filling body 4, reacts with basic tailing and cement hydration products in the tailing cemented filling body 4, consumes CO 2 While simultaneously generating high-strength calcium carbonate CaCO 3 And silica gel SiO with gelling action 2 ·nH 2 O, thereby improving the overall strength and the air tightness of the tailing cemented filling body 4, reducing the porosity of the tailing cemented filling body 4 and realizing large-scale, long-term and safe carbon sealing;
example one
A goaf carbon sealing method based on stratified approach tailing cemented filling mining is combined with a downward stratified filling mining method, and comprises the following specific steps and parameters:
the ore block is divided into 4m wide, 3m high, three layers per section, 9m high, three sections per section, and 27m high as shown in fig. 1(a) and 1 (b). The ratio of the tailings cemented filling body to the sand-lime is 1: 6, the filling slurry concentration is 75 percent, the 3d strength of the filling body is 1.5MPa, and the 28d strength is 3.5 MPa. The ratio of the high-strength tailing cemented filling body to the sand-lime is 1: 4, the filling slurry concentration is 75 percent, and the 3d strength of the filling body is 2.5MPa and the 28d strength is 5 MPa. And the top of each middle section adopts airtight concrete to construct an airtight artificial false roof 6, in addition, the inner sides of the top part layer and the bottom part layer of the ore body, which are close to the ore body, adopt airtight concrete to respectively construct an airtight artificial false roof 6 and an airtight artificial false bottom 7, and the side walls also adopt airtight concrete as airtight filling materials 1.
As shown in fig. 2(a) and 2(b), step 1. firstly, excavating a stope connecting roadway 10, excavating a layered connecting roadway, two-side approach and a side approach parallel to the layered connecting roadway in turn along the stope side in a zigzag manner, then filling the side approach and the two-side approach parallel to the layered connecting roadway in turn, and leaving the stope connecting roadway and the layered connecting roadway to serve the current layers, wherein C0-C11 are stope mining sequences; F0-F11 is a stope filling sequence, and the construction sequence is C0 → C1 → C2 → C3 → F0 → F1, wherein the outer side of the side wall access road is filled with a high-strength tailing cemented filling body 5, and the inner side of the side wall access road is filled with airtight concrete 1;
Example two
A goaf carbon sealing method based on stratified approach tailing cemented filling mining comprises the following specific steps and parameters when being combined with an upward stratified filling mining method:
the ore block is divided into three sections, namely, a path width is 4m, a layering height is 3m, each section is three layers and is 9m, and each section is three sections and is 27m high, as shown in fig. 3(a) and 3 (b). The ratio of the tailings cemented filling body to the sand-lime is 1: 8, the filling slurry concentration is 75 percent, and the 3d strength of the filling body is 1.2MPa and the 28d strength is 2 MPa. The ratio of the high-strength tailing cemented filling body to the sand-lime is 1: 4, the filling slurry concentration is 75 percent, and the 3d strength of the filling body is 2.5MPa and the 28d strength is 5 MPa. The waste rock filling rate of the waste rock filling area is 40% -50%, namely 50% -60% of space is reserved in the waste rock filling area for carbon sealing. And the bottom of each middle section adopts airtight concrete to construct an airtight artificial false bottom 7, in addition, the linings of the top part layer and the bottom part layer of the ore body, which are close to the ore body, adopt airtight concrete to respectively construct an airtight artificial false top 6 and an airtight artificial false bottom 7, and the side walls also adopt airtight concrete as airtight filling materials 1.
As shown in fig. 4(a) and 4(b), step 1. firstly, excavating a stope connecting roadway 10, excavating a layered connecting roadway, two-side approach and a side approach parallel to the layered connecting roadway in turn along the stope side in a zigzag manner, then filling the side approach and the two-side approach parallel to the layered connecting roadway in turn, and leaving the stope connecting roadway and the layered connecting roadway to serve the current layers, wherein C0-C11 are stope mining sequences; F0-F11 is a stope filling sequence, and the construction sequence is C0 → C1 → C2 → C3 → F0 → F1, wherein the outer side of the side slope approach is filled with a high-strength tailing cemented filling body 5, and the inner side of the side slope approach is filled with airtight concrete 1;
Claims (10)
1. A goaf carbon sequestration method based on stratified approach tailing cemented filling mining is characterized by comprising the following steps: on the basis of stratified approach tailing cemented filling mining, a sealing layer is built on the boundary of an ore body (12) of a metal ore by using an airtight material (1) to seal the whole goaf, a high-strength tailing cemented filling body (5) on a side, an artificial false roof (6) or an artificial false bottom (7) and a tailing cemented filling body (4) filled in the goaf at intervals are used for supporting the whole goaf framework, and CO is reserved in the goaf according to the field condition 2 Sealing off empty areas (2) or highly porous CO 2 Sealing waste rock filling area (3), carbon sealing initial stage using pipeline to CO 2 Sealing off empty area (2) or CO 2 CO is filled into the sealed waste rock filling area (3) 2 CO is introduced by means of a gas-tight material (1) at the boundary of the ore body (12) 2 Sealed in the goaf, along with CO sealed in the goaf 2 Diffused into the tailing cemented filling body (4) to react with basic tailing and cement hydration products in the tailing cemented filling body (4) to consume CO 2 While simultaneously generating high-strength calcium carbonate CaCO 3 And silica gel SiO with gelling effect 2 ·nH 2 O, thereby improving the overall strength and the air tightness of the tailing cemented filling body (4), reducing the porosity of the tailing cemented filling body (4), and realizing a large amount of long-term and safe carbon sealing;
the method comprises the following specific steps:
step 1, mining the side wall of the current layered ore body in a shape like a Chinese character 'hui', sealing the side wall except for the connection roadway by using an airtight material (1), and reserving a stope connection roadway (10) and a layered connection roadway (11) to serve the currently mined layer;
and 2, mining the internal ore body (12) except the side wall by using a layered approach filling method, and if the ore body (12) is mined by using a downward layered approach filling mining method, filling the mined-out approach at intervals by using tailing cemented filling bodies (4)Reserving CO 2 Sealing the goaf (2), and if an upward layered approach filling mining method is adopted, forming CO by using a tailing cemented filling body (4) and an approach of the waste rock interval filling goaf 2 Sealing a waste rock filling area (3);
step 3, after the current layered operation is finished, erecting CO in the stope connecting roadway (10) and the layered connecting roadway (11) 2 Sealing off empty area (2) or CO 2 Sealing CO from waste rock filling area (3) to segmented transportation roadway (8) 2 A pipeline (9) and then closing the stope access (10) and the layered access (11) with the airtight material (1);
step 4, repeating the steps 1-3 layer by layer according to the layered mining sequence until the current middle section operation is finished, and collecting the CO 2 By CO arranged along the return air path 2 Pipeline injection of CO 2 Sealing off the empty area (2) or CO 2 Sealing up the filling area (3) of the waste rock, and simultaneously transferring the mining operation to the next middle section, wherein CO increases along with the mining depth and the ground temperature 2 And sealing in gas state to supercritical state for long time.
2. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by: in the mining process, the middle section, the segmentation and the layering of the ore body (12) are divided, and the mining and filling sequence along the depth direction of the ore body is completely consistent with the layered access filling mining method; the layered approach is divided into a side wall approach and an ore body internal approach on the boundary of surrounding rocks and ore bodies, the operation mode of the layered approach is to mine and seal the side wall approach according to the Chinese character 'hui' shape sequence, mine and fill the internal approach according to the principle that the two side approaches of the ore body are gradually pushed to the ore body middle approach, and if the two side approaches of the ore body need to reserve CO, CO is reserved 2 Sealing off empty areas (2) or highly porous CO 2 The approach of the waste rock filling area (3) is sealed, the approach is skipped first, the next approach is mined and filled, and when CO is required to be reserved 2 Sealing off empty areas (2) or highly porous CO 2 After the accesses at the two sides of the access of the sealed waste rock filling area (3) are filled, the access is mined, and then the space is reserved or waste rock is filled to form CO 2 Sealing off empty areas (2) or highly porous CO 2 Sealing and storing the waste rock filling area (3).
3. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by:
the method for closing the side walls except the connecting roadway by using the airtight material (1) comprises the following steps: filling the outer side of the side slope approach close to the surrounding rock by using a high-strength tailing cemented filling body (5), filling the inner side of the side slope approach close to the ore body by using an airtight material (1), and reserving 1/10 side slope approach width between the airtight material (1) and an internal undeployed block as an isolation space for ore caving impact to protect the two side filling bodies and a sealing material;
the method for sealing the side connecting roadway by using the airtight material (1) comprises the following steps: the inner side of the layered connection roadway (11) close to the side of the ore body is filled with airtight materials (1), the outer side of the layered connection roadway (11) close to the side of the surrounding rock is filled with high-strength tailing cemented filling bodies (5), and the stope connection roadway (10) is completely filled with tailing cemented filling bodies (4).
4. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by:
ore body (12) top part layer and bottom part layer need set up artifical false top of gas tightness (6) and artifical false bottom of gas tightness (7) respectively, adopt down to the layering approach filling method to exploit when the selection, need set up artifical false top of gas tightness (6) at every middle section top, if select to adopt upward layering approach filling method to exploit, need set up artifical false bottom of gas tightness (7) at every middle section bottom, through artifical false top of gas tightness (6) and artifical false bottom of gas tightness (7), combine limit airtight material (1) and high strength tailings cemented filling body (5), form the stable carbon that uses the middle section as the unit and seal up the unit structure.
5. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by: captured CO 2 From four discharge sources of electric power, cement, steel and chemical industry; captured CO 2 Through the ground arranged near the return air shaftWatch CO 2 The pump station is connected to the CO at the junction of the segmented transportation roadway (8) and the stope connecting roadway (10) along the return air shaft and the return air roadway through pipelines 2 A conduit (9) for feeding CO 2 Is injected into the dead zone (2) or the waste rock filling zone (3) to avoid CO 2 The leakage of the pipeline (9) pollutes the fresh air flow.
6. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 2, characterized in that: CO 2 2 CO of the pipeline (9) 2 The conveying pressure is controlled to maintain the stability of the side air-tight material (1) and the high-strength tailing cemented filling body (5) and simultaneously locally tear CO 2 Sealing off empty area (2) or CO 2 Sealing the level of the tailings cemented filling body (4) around the filling zone (3) for the barren rocks, wherein gaseous CO 2 The pressure can be reduced to below 1MPa, the method is suitable for a goaf with the burial depth of an ore body (12) being less than 100m and the ground stress and the surrounding rock strength being lower in the initial mining period, and the CO filled in can be gradually improved along with the increase of the mining depth, the ground stress and the surrounding rock strength 2 Pressure, when the ground temperature of the stratum where the goaf is located is more than 31 ℃ and the mining depth is more than 800m, the supercritical state CO sequestration is considered 2 。
7. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by: CO near the junction of the stope connecting roadway (10) and the segment haulage roadway (8) 2 The pipeline (9) is provided with CO 2 A pressure sensor, a gas-tight valve and a flange interface; when CO is present 2 After the injection operation is finished, the airtight valve is closed, the flange connector is loosened, and the flange connector is sealed to block CO 2 A sealing zone (2) or CO 2 Sealing the pipeline communicated with the waste rock filling area (3) and filling the CO on the current segmental transportation lane 2 The pipeline is recovered on the next subsection transportation roadway for reuse by using ground surface CO 2 Pumping station to other CO in current section 2 The pipeline is kept still and extends downwards to the next subsection; CO 2 2 Pressure sensor monitoring CO during sequestration 2 Sealing off empty area (2) or CO 2 Sealing off CO in the filling area (3) for waste rock 2 The pressure changes.
8. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by: setting CO at intervals of one subsection height distance in surrounding rock near the ore body side 2 Concentration sensor for CO 2 Leakage early warning; if there is no significant CO during the sealing period 2 Leakage and detection of CO 2 Sealing off empty area (2) or CO 2 Sealing off CO in the waste rock filling zone (3) 2 The slow drop in the pressure sensor reading indicates CO 2 With the filler undergoing a mineralization reaction when CO 2 The pressure is reduced to 75% of the set pressure, and the CO can be reconnected by using the airtight valve and the flange interface 2 A source of CO 2 Sealing off empty area (2) or CO 2 Sealing the waste rock filling area (3) for pressure compensation.
9. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by: the tailing cemented filling slurry used by the tailing cemented filling body (4) comprises mine tailing, Portland cement or fly ash, steel slag composite portland cement, water and an additive, the concentration of the filling slurry is more than 70 percent, and the 3d strength is more than 1 MPa; the mass ratio of the sand to the ash in the tailing cemented filling body (4) used in the downward layered filling method is more than 1: 6, 28d strength is more than 3.5 MPa; the mass ratio of the ash to the sand in the tailing cementing filling body (4) of the upward layered filling method is more than 1: 8, 28d strength is more than 2 MPa; the mass ratio of the ash to the sand in the high-strength tailing cemented filling body (5) outside the filling side drift and the layered connection roadway is more than 1: 4, 28d strength is more than 5 MPa.
10. The goaf carbon sequestration method based on stratified approach tailing cemented filling mining according to claim 1, characterized by:
the airtight material (1) comprises airtight concrete, asphalt-based airtight filling materials and mining filling airtight materials;
the air-tight artificial false roof (6) and the air-tight artificial false bottom (7) comprise air-tight concrete, a composite structure of concrete and asphalt-based air-tight filling materials and a composite structure of concrete and mining filling sealing materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210690965.2A CN114961845B (en) | 2022-06-17 | 2022-06-17 | Gob carbon sequestration method based on stratified approach tailing cemented filling mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210690965.2A CN114961845B (en) | 2022-06-17 | 2022-06-17 | Gob carbon sequestration method based on stratified approach tailing cemented filling mining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114961845A true CN114961845A (en) | 2022-08-30 |
| CN114961845B CN114961845B (en) | 2023-02-24 |
Family
ID=82964373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210690965.2A Active CN114961845B (en) | 2022-06-17 | 2022-06-17 | Gob carbon sequestration method based on stratified approach tailing cemented filling mining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114961845B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011079538A1 (en) * | 2009-12-28 | 2011-07-07 | 河北邯邢矿冶设计院有限公司 | Method for stope-and-fill mining in sections |
| CN105041314A (en) * | 2015-06-13 | 2015-11-11 | 招金矿业股份有限公司大尹格庄金矿 | Method for united mining of deep subsequent stoping chamber and layered stoping jamb |
| CN106869931A (en) * | 2017-02-14 | 2017-06-20 | 广西高峰矿业有限责任公司 | A kind of barren rock and cementing layering wedging mining with stowing technique and its structure |
| CN110905515A (en) * | 2019-11-25 | 2020-03-24 | 南华大学 | Combined filling mining method for complex ore body |
| CN113213829A (en) * | 2021-05-21 | 2021-08-06 | 北京科技大学 | Tailing carbonization cemented filling method |
| CN113914931A (en) * | 2021-09-30 | 2022-01-11 | 山东科技大学 | Method for performing goaf sealing and combustion inhibition by utilizing gangue isolation belt in coal mining process |
| CN114538876A (en) * | 2022-03-21 | 2022-05-27 | 重庆大学 | Mineralization of CO by solid waste of mining industry2Method for preparing mine cemented filling material |
-
2022
- 2022-06-17 CN CN202210690965.2A patent/CN114961845B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011079538A1 (en) * | 2009-12-28 | 2011-07-07 | 河北邯邢矿冶设计院有限公司 | Method for stope-and-fill mining in sections |
| CN105041314A (en) * | 2015-06-13 | 2015-11-11 | 招金矿业股份有限公司大尹格庄金矿 | Method for united mining of deep subsequent stoping chamber and layered stoping jamb |
| CN106869931A (en) * | 2017-02-14 | 2017-06-20 | 广西高峰矿业有限责任公司 | A kind of barren rock and cementing layering wedging mining with stowing technique and its structure |
| CN110905515A (en) * | 2019-11-25 | 2020-03-24 | 南华大学 | Combined filling mining method for complex ore body |
| CN113213829A (en) * | 2021-05-21 | 2021-08-06 | 北京科技大学 | Tailing carbonization cemented filling method |
| CN113914931A (en) * | 2021-09-30 | 2022-01-11 | 山东科技大学 | Method for performing goaf sealing and combustion inhibition by utilizing gangue isolation belt in coal mining process |
| CN114538876A (en) * | 2022-03-21 | 2022-05-27 | 重庆大学 | Mineralization of CO by solid waste of mining industry2Method for preparing mine cemented filling material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114961845B (en) | 2023-02-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104564072B (en) | Complete non-coal-pillar continuous depressurized mining method for close-distance coal seam groups | |
| CN110344877B (en) | Method for storing carbon dioxide gas in goaf filled with porous medium | |
| CN116816439A (en) | Method for sealing CO2 by using goaf of abandoned coal mine | |
| CN104989339B (en) | A kind of system and method for old dead zone extraction coal bed gas | |
| CN100356036C (en) | Method for pumping out gas from mining coal layer roof | |
| CN109026006A (en) | Exploitation open pit slope covers the new method of mineral products | |
| CN115628106B (en) | Mine solid waste fluidization filling treatment synergistic carbon dioxide sealing method | |
| CN110410076B (en) | Filling mining method for recovering left coal pillars in goaf of old house pillar | |
| CN105781551A (en) | Horizontal strip type mixed filling mining method applicable to three-underground orebody mining | |
| CN103147792A (en) | Drift type coal mining filling method | |
| CN106437823A (en) | Method for eliminating coal mine gas explosion, burst and exceeding | |
| CN116163730A (en) | Method for mining and sealing carbon dioxide by bidirectional forward filling of thin coal layer drilling machine | |
| CN108952719B (en) | Method for coal loss in coal seam gasification re-mining under fully mechanized caving mining condition | |
| CN108775240B (en) | A kind of method of half-edge coal seam fluidization exploitation | |
| CN112830531B (en) | Method for treating acidic water pollution source head of abandoned mine | |
| CN105971563A (en) | Extraction method for coal bed gas in composite old mined-out area formed through lower tool post method | |
| CN114961845B (en) | Gob carbon sequestration method based on stratified approach tailing cemented filling mining | |
| CN115853579A (en) | Coal mine filling and mining cooperative carbon dioxide solid storage system and method | |
| CN104832130B (en) | Help residual coal gasification recovery method in opencut end | |
| CN112412461B (en) | Open-pit mine end slope coal filling mining process method | |
| CN114017030A (en) | Ascending continuous mining method for building ore removal structure in roof caving area of staged stope | |
| CN113756857A (en) | Fire prevention and extinguishing extraction method for efficiently extracting coal bed gas in multi-layer old goaf on ground | |
| CN110566172A (en) | method for fracturing coal bed by using flue gas of high-pressure thermal power plant | |
| CN117365633B (en) | Carbon dioxide filling method | |
| CN115028422B (en) | Novel coal seam roof separation layer grouting material and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |