CN116816430A - Backfilling method for solid potash salt ore tailings - Google Patents
Backfilling method for solid potash salt ore tailings Download PDFInfo
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- CN116816430A CN116816430A CN202310874987.9A CN202310874987A CN116816430A CN 116816430 A CN116816430 A CN 116816430A CN 202310874987 A CN202310874987 A CN 202310874987A CN 116816430 A CN116816430 A CN 116816430A
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- chloride solution
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007787 solid Substances 0.000 title claims abstract description 27
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical class [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 title claims abstract description 23
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 118
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 57
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 34
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 18
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 18
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000292 calcium oxide Substances 0.000 claims abstract description 17
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 17
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 10
- 238000005192 partition Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 235000010755 mineral Nutrition 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- 239000000243 solution Substances 0.000 description 44
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 10
- 229910052700 potassium Inorganic materials 0.000 description 10
- 239000011591 potassium Substances 0.000 description 10
- 238000000465 moulding Methods 0.000 description 8
- 239000012267 brine Substances 0.000 description 7
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 7
- 239000004568 cement Substances 0.000 description 5
- 229940072033 potash Drugs 0.000 description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 5
- 235000015320 potassium carbonate Nutrition 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000011343 solid material Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000011833 salt mixture Substances 0.000 description 3
- 239000003469 silicate cement Substances 0.000 description 3
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- NEMFQSKAPLGFIP-UHFFFAOYSA-N magnesiosodium Chemical compound [Na].[Mg] NEMFQSKAPLGFIP-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a backfilling method of solid potash salt ore tailings, which comprises the following steps: step 1, taking magnesium oxide, quicklime slag and potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding a magnesium chloride solution to prepare filling slurry; step 2, preparing the filling slurry into a concrete salt backfill block, and curing to prepare the block; step 3, building a retaining wall by using building blocks to block a mineral room, and spraying filling slurry on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible; and 4, excavating a partition wall ore room to enable a dry material conveying belt and a magnesium chloride solution pipeline to enter a space of the ore room, placing a liftable vibration stirring device in the ore room, inputting mixed dry materials into the ore room through the dry material conveying belt, simultaneously opening a valve of the magnesium chloride solution pipeline, closing the material input device after the materials are connected with the top, taking out the liftable vibration stirring device, and plugging a feed inlet. The invention has low backfill cost, high efficiency and high strength.
Description
Technical Field
The invention relates to the technical field of tailing backfill, in particular to a solid potassium salt ore tailing backfill method.
Background
Potassium salts are a generic term for potassium-containing minerals. The soluble potassium salt minerals and insoluble potassium-containing aluminosilicate minerals are classified into the soluble potassium salt minerals and insoluble potassium-containing aluminosilicate minerals. The former is a mineral resource which is formed by stacking natural soluble potassium salt-containing minerals and can be utilized. Aluminosilicate rock is an insoluble potassium-containing rock or potassium-rich rock.
The solid soluble sylvite resource has high grade and large reserve, and is suitable for large-scale underground exploitation. Traditional mining methods extract useful potassium ions through mine or tunnel underground mining, and then through dissolution, flotation and other processes, while the salt-containing potassium salt tailings and brine (magnesium chloride solution) are discarded as waste materials. Because the potassium salt tailings and the brine are piled up or deposited on the ground, the environment is potentially polluted for a long time, and particularly in southeast Asia, the precipitation amount in rainy seasons is large, and the old brine is extremely easy to overflow and pollute the environment. The goaf is about 300-400 m away from the ground, the groundwater in southeast Asia is rich, and the salt mine is easily soluble and water is not backfilled, so that the geological collapse is easily caused, and huge potential safety hazards exist.
The existing common method is that slag or potassium salt tailings are mixed with a certain amount of old brine and then are directly backfilled into a goaf by using a large machine (a loader, an excavator and the like), the backfill rate is low, the potassium salt tailings are soluble salts, the potassium salt tailings belong to a discrete structure, the backfill strength is low, the density is low, the top connection cannot be realized, and the strength cannot meet the requirements; the magnesium cement is adopted to backfill the magnesium oxide, so that the economic pressure of enterprises producing high-cost potassium fertilizers is high, and the uncontrollable solidification phenomenon easily occurs due to the poor control of the amounts of the magnesium oxide and the brine in the traditional magnesium cement backfilling process, so that the backfilling process cannot be performed. The magnesium cement building blocks are used for backfilling, and the defects of high backfilling cost, incapability of propping up backfilling materials, unqualified strength and the like exist. The goaf is backfilled by using common silicate cement concrete, so that the cost is high, the potassium salt goaf is provided with a large amount of sodium-magnesium alkali metal ions, the common silicate cement concrete is not resistant to salt corrosion, the durability in an underground tunnel is poor, and certain potential safety hazard exists; the ordinary silicate cement is used as the binder to perform the cementing effect with the potassium salt tailings, the strength of the filling body cannot meet the requirements of the filling mining process, the cement consumption is excessive, and the backfilling cost is excessive.
Disclosure of Invention
The invention aims to solve the problems that the strength of the solid potash salt ore tailings in the backfilling process in the prior art cannot meet the requirements and the cost is high, and provides a backfilling method for the solid potash salt ore tailings.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a backfilling method of solid potash ore tailings comprises the following steps:
step 1, taking magnesium oxide, quicklime slag and potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding a magnesium chloride solution to prepare filling slurry;
step 2, filling the filling slurry prepared in the step 1 into a mould to prepare a concrete salt backfill block, and curing the block at room temperature to prepare the block;
step 3, building the retaining wall by using the building blocks obtained in the step 2 to block the ore room, and spraying the filling slurry obtained in the step 1 on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible;
step 4, excavating a partition wall ore room to enable a dry material conveying belt and a magnesium chloride solution pipeline to enter a space of the ore room, placing a liftable vibration stirring device in the ore room, inputting the mixed dry material in the step 1 into the ore room through the dry material conveying belt, metering the input quantity of the mixed dry material, simultaneously opening a magnesium chloride solution pipeline valve, controlling the flow of the magnesium chloride solution, closing the material input device after the material is connected with the top, taking out the liftable vibration stirring device, plugging a feeding hole, completing filling of the ore room, filling the next ore room, and filling one ore room with air.
In the above technical scheme, in the step 1, the mass of the quicklime is 5-15% of the total amount of the potassium salt tailings.
In the technical scheme, in the step 1, the mass of the quicklime slag is 1-15% of the total amount of the potassium salt tailings.
In the above technical scheme, in the step 1, the mass of the magnesium oxide is 1-5% of the total amount of the potassium salt tailings.
In the above technical scheme, in the step 1, the concentration of the magnesium chloride solution is 25-35%, and the mass ratio of the magnesium chloride solution to the mixed dry material is (1-2): (7-10).
In the technical scheme, the magnesium chloride solution is placed in the magnesium chloride solution tank, an evaporation mechanism is arranged in the magnesium chloride solution tank, and the concentration of the magnesium chloride solution is controllable.
In the above technical scheme, in the step 2, the pressurizing pressure of curing and curing is 30-40MPa.
In the above technical scheme, in the step 2, the curing and curing time is 5-10 days.
In the above technical scheme, in the step 3, outlets of the material conveying belt and the magnesium chloride solution pipeline are all located at the highest position of the retaining wall, so that the pipeline and the conveying belt can be conveniently withdrawn.
In the above technical scheme, in the step 4, the mass ratio of the mixed dry material to the magnesium chloride solution input into the ore room is 10:1.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention uses the waste residues in the production process of quick lime and quick lime as the potassium salt tailing backfill additive and auxiliary filling material, can fully utilize local resources, greatly reduces backfill cost, enables large-scale backfill to be possible, and not only backfills the potassium salt tailings, but also uses the tailings in the production process of limestone, thereby achieving two purposes of environmental protection. And then the strength of the backfill material is improved by combining magnesium oxide.
2. The mixed dry materials are input into the goaf room by utilizing the conveying belt during mining, and the magnesium chloride solution (brine) is conveyed to the goaf room by adopting a special pipeline, so that the phenomenon that uncontrollable solidification easily occurs due to poor control of the amounts of magnesium oxide and brine in the traditional magnesium cement backfilling process is effectively solved.
3. The potassium salt tailings, the magnesium oxide and the magnesium chloride are used for manufacturing the building blocks according to a certain proportion to seal the ore room before backfilling, filling slurry is sprayed on the inner wall and the outer wall, gaps among the building blocks are sealed to the greatest extent, and the contact between materials and air is reduced. The invention adopts the tail salt building blocks as the enclosure and then carries out the ore room backfilling process, thereby effectively solving the defect that the backfilling is not connected with the roof.
4. The tail salt mixture is conveyed to a ore room through a conveying belt, meanwhile, magnesium chloride solution is required to be introduced, a vibration stirring device is arranged in the ore room, and the stirring device is required to fully stir liquid and solid. The vibration stirring device is improved along with the continuous improvement of the backfilling height, and finally is taken out from the bulkhead chamber after horizontal vibration
5. The tail salt mixture conveying belt conveying device is positioned, and the magnesium chloride solution pipeline is positioned at the high position of the wall of the spacing ore room, so that the tail salt mixture conveying belt is convenient to move out for the operation of the next ore room.
Detailed Description
The present invention will be described in further detail with reference to specific examples. 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.
Example 1
Preparing solid soluble potassium ore, concentrating to obtain potassium salt tailings and magnesium chloride solution, wherein the concentration of the magnesium chloride solution is 25%.
A backfilling method of solid potash ore tailings comprises the following steps:
step 1, taking 1 part of magnesium oxide, wherein the content of active magnesium oxide is 60%,5 parts of quicklime, 1 part of quicklime slag and 83 parts of potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding 10 parts of magnesium chloride solution to prepare filling slurry;
step 2, filling the filling slurry prepared in the step 1 into a mould to prepare a concrete salt backfill block, curing and maintaining the block at room temperature, performing compression molding for 7 days to prepare the block, wherein the molding pressure is 30-40MPa, and measuring the compressive strength of the block after 7 days of molding to be 10MPa;
step 3, building the retaining wall by using the building blocks obtained in the step 2 to block the ore room, and spraying the filling slurry obtained in the step 1 on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible;
and 4, excavating a partition wall ore room to enable a potassium salt tailing conveying device and a magnesium chloride solution pipeline to enter a space of the ore room, placing a liftable vibration stirring device in the ore room, inputting the mixed dry materials in the step 1 into the ore room through a dry material conveying belt, metering the input quantity of the mixed dry materials, simultaneously opening a magnesium chloride solution pipeline valve, controlling the flow of the magnesium chloride solution to enable the mass ratio of the input solid materials to the magnesium chloride solution materials to be 10:1, closing the material input device after the materials are connected with the top, taking out the vibration stirring device, plugging a feeding port, and completing filling of the ore room.
The vibration stirring device is lifted along with the backfilling height, finally vibrates horizontally, and is horizontally taken out from the position of the dry material conveying belt, namely the high position of the partition wall mine house, and the vibration stirring device in the following embodiment is also taken out in the mode.
Example 2
Preparing solid soluble potassium ore, concentrating to obtain potassium salt tailings and magnesium chloride solution, wherein the concentration of the magnesium chloride solution is 28%.
A backfilling method of solid potash ore tailings comprises the following steps:
step 1, taking 2 parts of magnesium oxide, wherein the content of active magnesium oxide is 60%,10 parts of quicklime, 5 parts of quicklime slag and 73 parts of potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding 9 parts of magnesium chloride solution to prepare filling slurry;
step 2, filling the filling slurry prepared in the step 1 into a mould to prepare a concrete salt backfill block, curing and maintaining the block at room temperature, performing compression molding for 7 days to prepare the block, wherein the molding pressure is 30-40MPa, and measuring the compressive strength of the block after 7 days of molding to be 13MPa;
step 3, building the retaining wall by using the building blocks obtained in the step 2 to block the ore room, and spraying the filling slurry obtained in the step 1 on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible;
and 4, excavating a partition wall ore room to enable a potassium salt tailing conveying device and a magnesium chloride solution pipeline to enter a space of the ore room, placing a liftable vibration stirring device in the ore room, inputting the mixed dry materials in the step 1 into the ore room through a conveying belt, metering the input quantity of the mixed dry materials, simultaneously opening a valve of the magnesium chloride solution pipeline, controlling the flow of the magnesium chloride solution to enable the mass ratio of the input solid materials to the magnesium chloride solution materials to be 10:1, closing the material input device after the materials are connected, taking out the vibration stirring device, blocking a feed inlet, and completing filling of the ore room.
Example 3
Preparing solid soluble potassium ore, concentrating to obtain potassium salt tailings and magnesium chloride solution, wherein the concentration of the magnesium chloride solution is 32%.
A backfilling method of solid potash ore tailings comprises the following steps:
step 1, taking 3 parts of magnesium oxide, wherein the content of active magnesium oxide is 60%,10 parts of quicklime, 5 parts of quicklime slag and 70 parts of potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding 12 parts of magnesium chloride solution to prepare filling slurry;
step 2, filling the filling slurry prepared in the step 1 into a mould to prepare a concrete salt backfill block, curing and maintaining the block at room temperature, performing compression molding for 7 days to prepare the block, wherein the molding pressure is 30-40MPa, and measuring the compressive strength of the block after 7 days of molding to be 15MPa;
step 3, building the retaining wall by using the building blocks obtained in the step 2 to block the ore room, and spraying the filling slurry obtained in the step 1 on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible;
and 4, excavating a partition wall ore room to enable a potassium salt tailing conveying device and a magnesium chloride solution pipeline to enter a space of the ore room, placing a lifting vibration stirring device in the ore room, inputting the mixed dry materials in the step 1 into the ore room through a conveying belt, metering the mixed dry materials, simultaneously opening a magnesium chloride solution pipeline valve, controlling the flow rate of the magnesium chloride solution to enable the mass ratio of the input solid material amount to the magnesium chloride solution material amount to be 10:1, closing the material input device after the materials are connected, taking out the vibration stirring device, blocking a feeding hole, and completing filling of the ore room.
Example 4
Preparing a potassium salt tailing and a magnesium chloride solution after the solid soluble potassium ore is subjected to beneficiation processing, wherein the concentration of the magnesium chloride solution is 35%.
A backfilling method of solid potash ore tailings comprises the following steps:
step 1, taking 3 parts of magnesium oxide, wherein the content of active magnesium oxide is 60%,5 parts of quicklime, 10 parts of quicklime slag and 67 parts of potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding 15 parts of magnesium chloride solution to prepare filling slurry;
step 2, filling the filling slurry prepared in the step 1 into a mould to prepare a concrete salt backfill block, curing and maintaining the block at room temperature, performing compression molding for 7 days to prepare the block, wherein the molding pressure is 30-40MPa, and measuring the compressive strength of the block after 7 days of molding to be 15MPa;
step 3, building the retaining wall by using the building blocks obtained in the step 2 to block the ore room, and spraying the filling slurry obtained in the step 1 on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible;
and 4, excavating a partition wall ore room to enable a potassium salt tailing conveying device and a magnesium chloride solution pipeline to enter a space of the ore room, placing a liftable vibration stirring device in the ore room, inputting the mixed dry materials in the step 1 into the ore room through a conveying belt, metering the input quantity of the mixed dry materials, simultaneously opening a valve of the magnesium chloride solution pipeline, controlling the flow of the magnesium chloride solution to enable the mass ratio of the input solid materials to the magnesium chloride solution materials to be 10:1, closing the material input device after the materials are connected, taking out the vibration stirring device, blocking a feed inlet, and completing filling of the ore room.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The backfilling method for the solid potash salt ore tailings is characterized by comprising the following steps of:
step 1, taking magnesium oxide, quicklime slag and potassium salt tailings, fully mixing and uniformly stirring to obtain a mixed dry material, and then adding a magnesium chloride solution to prepare filling slurry;
step 2, filling the filling slurry prepared in the step 1 into a mould to prepare a concrete salt backfill block, and curing the block at room temperature to prepare the block;
step 3, building the retaining wall by using the building blocks obtained in the step 2 to block the ore room, and spraying the filling slurry obtained in the step 1 on the inner wall and the outer wall of the retaining wall to enable gaps of the building blocks to be completely closed to isolate air as far as possible;
step 4, excavating a partition wall ore room to enable a dry material conveying belt and a magnesium chloride solution pipeline to enter a space of the ore room, placing a liftable vibration stirring device in the ore room, inputting the mixed dry material in the step 1 into the ore room through the dry material conveying belt, metering the input quantity of the mixed dry material, simultaneously opening a magnesium chloride solution pipeline valve, controlling the flow of the magnesium chloride solution, closing the material input device after the material is connected with the top, taking out the liftable vibration stirring device, plugging a feeding hole, completing filling of the ore room, filling the next ore room, and filling one ore room with air.
2. The method for backfilling the solid potash salt ore tailings according to claim 1, wherein in the step 1, the mass of the quicklime is 5-15% of the total amount of the potash salt ore tailings.
3. The method for backfilling solid potash salt ore tailings according to claim 1, wherein in the step 1, the mass of the quicklime slag is 1-15% of the total amount of the potash salt ore tailings.
4. The method for backfilling solid potash salt ore tailings according to claim 1, wherein in the step 1, the mass of magnesium oxide in the step 1 is 1-5% of the total amount of the potash salt ore tailings.
5. The method for backfilling solid potash salt ore tailings according to claim 1, wherein in the step 1, the concentration of the magnesium chloride solution in the step 1 is 25-35%, and the mass ratio of the magnesium chloride solution to the mixed dry material is (1-2): (7-10).
6. The method for backfilling solid potash salt ore tailings of claim 1 wherein the magnesium chloride solution is placed in a magnesium chloride solution tank, and an evaporation mechanism is arranged in the magnesium chloride solution tank.
7. The method for backfilling solid potash salt ore tailings of claim 1 wherein in the step 2, the pressurizing pressure of curing and curing is 30-40MPa.
8. The method for backfilling solid potash salt ore tailings of claim 1 wherein in step 2, the curing time is 5-10 days.
9. The method for backfilling solid potash salt ore tailings according to claim 1, wherein in the step 3, outlets of the material conveying belt and the magnesium chloride solution pipeline are positioned at the highest position of the retaining wall.
10. The method for backfilling solid potash salt ore tailings according to claim 1, wherein in the step 4, the mass ratio of the mixed dry material to the magnesium chloride solution input into the ore room is 10:1.
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| CN202310874987.9A CN116816430A (en) | 2023-07-17 | 2023-07-17 | Backfilling method for solid potash salt ore tailings |
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