CN113429011A - Comprehensive treatment method for mine water of large water mine - Google Patents
Comprehensive treatment method for mine water of large water mine Download PDFInfo
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- CN113429011A CN113429011A CN202110618397.0A CN202110618397A CN113429011A CN 113429011 A CN113429011 A CN 113429011A CN 202110618397 A CN202110618397 A CN 202110618397A CN 113429011 A CN113429011 A CN 113429011A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention discloses a comprehensive treatment method of mine water of a large water mine, which comprises the following steps: 1) adopting curtain grouting technology to build a water-blocking curtain which is totally closed in the horizontal and vertical directions around the ore body; 2) collecting the mine water in the curtain to an underground permanent water sump for primary physical sedimentation, and discharging the generated sludge to a tailing concentration tank on the ground surface; 3) the mine water after the primary physical sedimentation is sent to a clarification tank on the ground surface for chemical flocculation sedimentation, and the generated sludge is discharged to a tailing concentration tank on the ground surface; 4) the mine water after chemical flocculation precipitation is subjected to deep purification treatment by adopting a deep purification system taking nanofiltration as a core, and the treated clean water reaches drinking water and national specified recharge water quality standards; 5) and (3) reinjecting part or all of the deeply purified clean water to an underground aquifer outside the curtain by adopting a large-flow reinjection technology. The method improves the mining operation conditions and ensures safe mining; has the characteristics of good treatment effect, less sewage discharge, energy conservation, environmental protection and the like.
Description
Technical Field
The invention relates to a waste water treatment system, in particular to a comprehensive treatment method for mine water of a large water mine.
Background
The mineral resources in China are large in reserve and wide in distribution, most local water resources and the mineral resources coexist, and the mine exploitation has serious damage to the water resources and serious water resource pollution. Mine water is wastewater discharged in the production process of metallurgical mines, and the discharge amount of the mine water is continuously increased along with the development of industry. According to statistics, mine water which is nearly 2 tons needs to be discharged when 1 ton of raw ore is mined on average, so that water resources are seriously polluted, underground water supply and demand around a mining area are unbalanced, the water level is greatly reduced, and industrial and domestic water shortage is caused. Meanwhile, the generation and discharge of a large amount of mine water bring serious threats to mine safety production. For mine enterprises, if mine water can be well ecologically treated and utilized, the water inflow in a mine can be greatly reduced, and the safety production is guaranteed; the ecological balance of regional underground water resources is facilitated, the problem of water resource shortage is solved, the comprehensive utilization efficiency of mine water resources is improved, and the zero discharge of the surface of the mine water of the large-water mine is finally realized.
At present, aiming at realizing zero discharge of mine water on the ground surface of a large water mine, a complete, green, safe, efficient and comprehensive mine water ecological treatment and comprehensive utilization method is not provided in China, the defects of high operation cost, incapability of recycling and comprehensive utilization and the like generally exist, and effective treatment and even zero discharge of pit waste water in the process of mining the large water mine cannot be really realized.
Disclosure of Invention
The invention aims to provide a comprehensive treatment method of mine water of a large water mine with good effect.
In order to solve the technical problems, the method and the process adopted by the invention are as follows: (1) adopting curtain grouting technology to build a water-blocking curtain which is totally closed in the horizontal and vertical directions around the ore body;
(2) collecting the mine water in the curtain to an underground permanent water sump for primary physical sedimentation, and discharging the generated sludge to a tailing concentration tank on the ground surface;
(3) the mine water after the primary physical sedimentation is sent to a clarification tank on the ground surface for chemical flocculation sedimentation, and the generated sludge is discharged to a tailing concentration tank on the ground surface;
(4) the mine water after chemical flocculation precipitation is subjected to deep purification treatment by adopting a deep purification system taking nanofiltration as a core, and the treated clean water reaches drinking water and national specified recharge water quality standards;
(5) and (3) reinjecting part or all of the deeply purified clean water to an underground aquifer outside the curtain by adopting a large-flow reinjection technology.
The purified water after the chemical flocculation precipitation in the step (3) overflows to a water source heat pump unit for waste heat utilization, and then the deep purification treatment in the step (4) is carried out.
The invention fills the goaf under the well with the tailings in the tailing concentration pool on the surface, the sludge discharged by primary physical sedimentation and the sludge discharged by the clarification pool on the surface.
The strong brine generated by the deep purification treatment in the step (4) is used for production water supply, fire-fighting water supply and/or environmental water supply, and the sewage collected again after use is subjected to production wastewater treatment and/or domestic sewage treatment.
The deep purification treatment in the step (4) adopts the process flows of multi-medium filtration, self-cleaning filtration, security filtration, nanofiltration and denitrification and disinfection by a breakpoint chlorine adding method.
In the step (5) of the invention, part of the clean water is used as equipment cooling water and domestic water, and the domestic sewage is treated by the sewage collected again after use.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the invention, before mining, the underground water resources in the mining area are treated by adopting an annular closed curtain grouting technology, so that the drainage quantity and the drainage cost in the mining area are greatly reduced, the local underground water environment is effectively protected, and the formation of a mining drainage underground water funnel is avoided; obviously improves the mining operation conditions and ensures the safe mining of the large water deposit. The invention carries out primary physical sedimentation through the underground permanent water sump, carries out chemical flocculation sedimentation through the clarification tank, carries out deep purification treatment through the water purification system, and the purified mine water is used for supplementing the life of all mine workers and the cooling water consumption of mineral separation equipment, and the rest of the mine water is injected underground by adopting a recharge technology, thereby conserving water sources for regions, playing an active role in restoring the water ecological environment of the whole region, and realizing the ecological utilization of the mine water of the large-water mine. The invention has the characteristics of good treatment effect, less sewage discharge, energy saving, environmental protection and the like.
The invention adopts the water source heat pump technology to extract the low-temperature waste heat in the mine water, is used for heating, refrigerating and bathing hot water in the whole mine, realizes zero carbon emission in the process of heating the mine, and is more energy-saving and environment-friendly
The strong brine produced by the invention is used for production, fire protection and water supply for environment, and realizes fire protection production and circulating closed-loop utilization of domestic water through a tailing concentration tank, domestic sewage treatment and the like, the utilization rate of mine water reaches 100%, and zero discharge of mine water on the earth surface of a large water mine is realized.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a process flow diagram of the deep purification treatment in the present invention.
Detailed Description
As shown in fig. 1, the comprehensive treatment method for mine water of a large water mine adopts the following process steps: (1) in order to guarantee underground water resources of regions and guarantee safe mining of large water mines, a waterproof curtain which is fully sealed in the horizontal and vertical directions is built around an ore body by adopting a curtain grouting technology, and the hydraulic connection of inner and outer aquifers of the curtain is effectively reduced. The ore body curtain grouting technology enables a circle of annular totally-enclosed curtain to be formed on the plane around an ore body, and the water plugging efficiency of the curtain can reach 80-85%. The method has the advantages that the drainage and the drainage cost in the ore body are greatly reduced through the ore body curtain grouting technology, the mining drainage and the drainage cost can be reduced by 80-85%, the local underground water environment is effectively protected, the formation of a mining drainage underground water funnel is avoided, and the safe mining of a large water deposit is guaranteed.
The mine is a typical domestic karst large water mine with complex hydrogeology, and the expected drainage of the safe mining reaches 15 ten thousand meters3And d. The ore body curtain grouting technology enables a circle of annular fully-closed curtain to be formed on the plane around an ore body, and the water plugging efficiency of the curtain body can reach 85% through verification. The mine drainage is obviously reduced by curtain grouting technology, and the actual drainage is more stable about 2.4 ten thousand meters3And d, the drainage quantity of the mine is greatly reduced, 4200 ten thousand yuan of drainage cost can be saved for the mine every year, the local underground water environment is effectively protected, a mining drainage underground water funnel is prevented from being formed, and the safe mining of a large water deposit is guaranteed.
(2) The mine water in the curtain can be reduced to 15% -20%, the reduced mine water is collected to the underground permanent water sump, and primary physical sedimentation of the mine water is carried out in the underground permanent water sump so as to remove larger impurities and silt in the mine water. The mining submersible pump water absorption protection device is arranged near the suction port of each working surface submersible pump, and a ditch impurity remover is arranged at the inlet of each roadway ditch, so that impurities such as detonating tube scraps and the like generated in the mine construction and production processes are collected and cleaned; and a roadway sedimentation tank is arranged in a proper place in the roadway step by step, and larger deposited particles are collected and cleaned in time. According to the sedimentation characteristic of sludge in the water sump, the sludge in the underground permanent water sump is cleaned in time, so that the drainage water quality of the mine water is improved, and the turbidity of the mine water is reduced. And discharging the settled sludge to a tailing concentration tank on the ground surface by a sludge discharge pump system, and filling the settled sludge and tailings in the tailing concentration tank to an underground goaf.
(3) Mine water is discharged to a clarification tank on the ground surface through a drainage pump in a central water pump room in the well; the clarification tank is a mechanical accelerated clarification tank, and is used for carrying out chemical flocculation and precipitation treatment on the mine water, further removing larger colloidal particles, impurities and suspended matters in the mine water, and realizing mud-water separation. Flocculating agents and coagulant aids in proper proportion are added into the clarifying tank for flocculation technical treatment, and the most preferable method is to adopt the binary self-sown trioxide and the polyacrylamide; and meanwhile, hydrated lime is added for softening treatment, so that the flocculation precipitation effect is improved, and the effluent of the clarification tank is ensured to be 1-10 NTU. Meanwhile, as the hardness of the mine water is reduced, the pollution to a subsequent membrane system is further reduced.
And a sludge discharge pump station is arranged at the bottom of the clarification tank, sludge generated at the bottom of the clarification tank is discharged to a tailing concentration tank through the sludge discharge pump, and an underground goaf is filled together with tailing to form closed cyclic utilization.
(4) Performing waste heat utilization on the mine water subjected to chemical flocculation and precipitation treatment in a clarification tank; the waste heat utilization process comprises the following steps: the mine water after chemical flocculation precipitation treatment overflows to a water source heat pump water storage tank, is pressurized by a mine water circulating pump and then is lifted to a water source heat pump unit, and the unit extracts low-temperature waste heat in the mine water so as to solve the problems of whole-mine heating in winter, auxiliary well mouth antifreezing, summer refrigeration and worker bath hot water all the year round. The zero carbon emission in the whole mine heating process is realized, the traditional coal-fired boiler and a central air-conditioning system are thoroughly replaced, and the energy conservation and emission reduction are really realized. After the mine water is used for waste heat utilization, the mine water is not consumed except for extremely little loss.
(5) The mine water after waste heat utilization flows to a deep purification system for deep purification treatment, the deep purification treatment adopts the process flows of multi-medium filtration, self-cleaning filtration, security filtration, nanofiltration and denitrification and disinfection by adopting a breakpoint chlorination method, and the treated mine water reaches the drinking water and national specified recharge water quality standard. As shown in fig. 2, the specific process of the deep purification treatment is as follows: adding sodium hypochlorite into mine water subjected to chemical flocculation precipitation or waste heat utilization for sterilization, then feeding the mine water into a raw water tank, conveying the mine water to a multi-media filter through a raw water pump, and adding a micro-flocculation agent in front of the multi-media filter for micro flocculation and multi-media filtration; reverse water filtered by multiple media is sent into a wastewater pool, and clear water enters a self-cleaning filter for self-cleaning filtration; clear water after self-cleaning and filtering enters a cartridge filter, and a scale inhibitor and a reducing agent are added along with the clear water; clear water after security filtration is sent into a nanofiltration device through a high-pressure pump for nanofiltration; the nanofiltration wastewater is used for mineral separation production or part of the nanofiltration wastewater is sent into a nanofiltration device again through a high-pressure pump for nanofiltration again; clear water subjected to nanofiltration enters a nanofiltration water tank, and the nanofiltration water tank is divided into a washing water storage grid and a disinfection deamination and denitrification grid; clear water in the washing water storage cell is used for washing the nanofiltration device; clear water in the disinfection deamination nitrogen grid is subjected to denitrification and disinfection by a breakpoint chlorination method, and clean water flowing out of an overflow port of the disinfection deamination nitrogen grid enters the next step (6) for recharging and recycling. Because the nanofiltration operation pressure is lower, compared with the conventional reverse osmosis, the deep purification system taking nanofiltration as a core can save about 30 percent of the operation cost.
(6) And (3) treating the clean water after deep purification by adopting a large-flow recharging technology, and recharging all or most of the clean water generated by deep purification to an underground aquifer outside the curtain through a recharging well. The mine water recharging is implemented, the drainage resource cost of thousands of yuan can be reduced for the mine every year, and considerable economic benefits are achieved; the underground mining water layer of the mining area is supplemented, and meanwhile, the water source is conserved for drinking water in the area, so that the water ecological environment in the whole area is repaired.
Taking the mine as an example, the single well recharge energy is 1068m3H is used as the reference value. The mine water recharging is implemented, 2365 ten thousand yuan of drainage resource cost can be reduced for the mine every year, and considerable economic benefits are achieved.
(7) Clean water is not used for recharging, wherein a part of clean water can be used as a cooling water consumption supplement of the beneficiation equipment for equipment cooling; one part of the water enters a living water storage tank to be used as living water for life of all mine workers, and the water replaces a primary running water source well, so that the power consumption is saved.
After sewage generated after the domestic water is used is collected by domestic sewage, the sewage is sent into a domestic sewage treatment system for domestic sewage treatment; the biological contact oxidation process is adopted to degrade and convert organic pollutants in the treated sewage and remove the pollutants, the clean water after the domestic sewage treatment is used for ground dust suppression, greening and the like, and the redundant water is discharged into a tailing concentration tank to form closed circulation and utilization.
(8) The strong brine generated after deep purification is used for producing water supply, fire-fighting water supply and/or environmental water supply; the production water supply is the production water required by the supplement of mineral separation production and filling pulping; the fire-fighting water supply is supplemented into a fire-fighting pool for fire fighting; the environmental water supply is used for supplementing other water for flushing the terrace, dedusting facilities, greening, flushing the toilet and the like. The sewage collected again after the production and fire-fighting water is used is treated by the production wastewater; after sewage collected after the environmental water supply is used is collected by domestic sewage, the sewage is sent into a domestic sewage treatment system for domestic sewage treatment.
(9) And the wastewater generated by the mineral separation production and the wastewater generated by each workshop are sent to a tailing concentration tank for concentration. The tailings of the tailing concentration tank, the settled sludge in the step (2) and the sludge generated at the bottom of the clarification tank in the step (3) are subjected to filter pressing and then backfilled into a goaf; and sending the tailing filtrate water generated by filter pressing into a tailing concentration tank again.
And the purified water produced by the tailing concentration tank overflows to an annular water tank of a production water supply pump station, and the separation ore production and filling slurry making are continuously used to form closed circulation and utilization.
By adopting the method, the local underground water environment is effectively protected, the formation of a mining drainage underground water funnel is avoided, the mining operation condition is obviously improved, and the safe mining of a large water deposit is ensured; zero carbon emission in the process of heating the mine is realized; the purified mine water is used for supplementing the life of all mine workers and the consumption of cooling water of mineral separation equipment except a small part, and the rest is injected underground by adopting a recharge technology, so that a water source is conserved for the region, and the ecological utilization of the mine water of the large-water mine is realized; the produced strong brine is completely used for mineral separation production and filling and slurry making, so that fire-fighting production and circulating closed-loop utilization of domestic water are realized; the utilization rate of the mine water reaches 100%, and the zero discharge of the mine water on the earth surface of the large water mine is realized.
Claims (6)
1. A comprehensive treatment method for mine water of a large water mine is characterized by comprising the following steps: (1) adopting curtain grouting technology to build a water-blocking curtain which is totally closed in the horizontal and vertical directions around the ore body;
(2) collecting the mine water in the curtain to an underground permanent water sump for primary physical sedimentation, and discharging the generated sludge to a tailing concentration tank on the ground surface;
(3) the mine water after the primary physical sedimentation is sent to a clarification tank on the ground surface for chemical flocculation sedimentation, and the generated sludge is discharged to a tailing concentration tank on the ground surface;
(4) the mine water after chemical flocculation precipitation is subjected to deep purification treatment by adopting a deep purification system taking nanofiltration as a core, and the treated clean water reaches drinking water and national specified recharge water quality standards;
(5) and (3) reinjecting part or all of the deeply purified clean water to an underground aquifer outside the curtain by adopting a large-flow reinjection technology.
2. The comprehensive treatment method for mine water of large water mines according to claim 1, which is characterized in that: and (4) overflowing the purified water subjected to the chemical flocculation precipitation in the step (3) to a water source heat pump unit for waste heat utilization, and then performing the deep purification treatment in the step (4).
3. The comprehensive treatment method for mine water of large water mines according to claim 1, which is characterized in that: and the tailings in the tailing concentration tank on the ground surface, the sludge discharged by primary physical sedimentation and the sludge discharged by the clarification tank on the ground surface are filled into a goaf under the well.
4. The comprehensive treatment method for mine water of large water mines according to claim 1, which is characterized in that: and (4) the strong brine generated by the deep purification treatment in the step (4) is used for production water supply, fire-fighting water supply and/or environmental water supply, and the sewage collected again after use is subjected to production wastewater treatment and/or domestic sewage treatment.
5. The comprehensive treatment method for mine water of large water mines according to claim 1, which is characterized in that: the deep purification treatment in the step (4) adopts the process flows of multi-medium filtration, self-cleaning filtration, security filtration, nanofiltration and denitrification and disinfection by a breakpoint chlorination method.
6. The comprehensive treatment method for the mine water of the large-water mine according to any one of claims 1 to 5, characterized by comprising the following steps of: in the step (5), part of the clean water is used as equipment cooling water and domestic water, and the domestic sewage is treated by the sewage collected again after use.
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| CN202110618397.0A CN113429011A (en) | 2021-06-03 | 2021-06-03 | Comprehensive treatment method for mine water of large water mine |
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Cited By (3)
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| CN114920308A (en) * | 2022-04-18 | 2022-08-19 | 长沙矿山研究院有限责任公司 | Underground mine wastewater zero discharge process |
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| CN116062932A (en) * | 2023-01-05 | 2023-05-05 | 中煤科工西安研究院(集团)有限公司 | Mine water purification system and process for deep reinjection and co-sealing carbon dioxide |
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Cited By (4)
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| CN114920308A (en) * | 2022-04-18 | 2022-08-19 | 长沙矿山研究院有限责任公司 | Underground mine wastewater zero discharge process |
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| CN116062932A (en) * | 2023-01-05 | 2023-05-05 | 中煤科工西安研究院(集团)有限公司 | Mine water purification system and process for deep reinjection and co-sealing carbon dioxide |
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Application publication date: 20210924 |