CN110054335A - A kind of mine water resource regulation configuration method based on surface storage pond - Google Patents

Abstract

The invention discloses a mine water resource regulation and configuration method based on a surface reservoir, wherein the mine water resource regulation and configuration method comprises: S1) classifying mine water resources into clean mine water and dirty mine water; S2) all the The clean mine water is reused on the spot and/or transported to the surface clean water reservoir for storage and utilization; S3) Pretreatment of the dirty mine water to obtain finished water that meets the discharge requirements; S4) The finished water is transported to the surface The finished water reservoir is stored for use. The mine water resource regulation and configuration method of the invention effectively solves the problems of random discharge and storage of mine water, and realizes the regulation and configuration of mine water resources.

Description

A method for regulating and configuring mine water resources based on surface reservoir

technical field

The invention relates to the technical field of mining, in particular to a method for regulating and configuring mine water resources based on a surface reservoir.

Background technique

In order to improve the underground working environment, control the hidden danger of water hazards, and ensure the safety of mine production, a large amount of mine water must be discharged all ^year round in the coal production process. ~4.0m ³ . Due to the large amount of mine drainage, the drainage cost per ton of coal is greatly increased, which makes the coal mining enterprises overburdened; the large amount of drainage in the mining area leads to the shortage of water for production and domestic use in the coal mining area and surrounding areas; when the drainage and water supply are greater than the groundwater recharge, the groundwater level If the mine water is not treated and discharged directly, it will also cause pollution of the surface water body and the water body of the underground aquifer; in addition, the large amount of drainage in the mine will lead to the deterioration of the ecological environment of the mining area. Therefore, in addition to the threat of water damage, most of the coal mines in my country are also faced with the contradiction between drainage, water supply and ecological protection in the coal mining area and its surrounding areas. What's more serious is that my country's water resources and coal resources are distributed in reverse, and there is a situation of "water shortage where there is coal, and coal shortage where there is water". Among them, 70% of the mining areas are short of water, and 40% of the mining areas are seriously short of water. The development of the coal industry is severely restricted by water resources.

For a long time, the focus of mine water has remained on its disaster effect on coal mine construction and production. Therefore, the prevention and control of mine water disasters has received extensive attention. The protection and rational utilization of groundwater resources are also very important.

The traditional method of mine water treatment and utilization is to discharge it to the ground conditioning tank through the drainage system. After the ground treatment, the water quality requirements for reuse are met. Some of it is used on the ground, and some of it is returned to the underground for use. Some coal mines use the underground goaf to store water, but there is a big safety hazard, and for inclined coal seams, the goaf cannot be used for water storage, and there is still a cost for underground water storage. A lot of financial resources, material resources and manpower monitor its safety performance for a long time.

In order to solve the shortcomings of the existing technology, it is necessary to propose a new method for regulating and configuring mine water resources.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to propose a mine water resource regulation and configuration method based on a surface reservoir, effectively solve the problem of random discharge and storage of mine water through the mine water resource regulation and configuration method of the present invention, and realize mine water resources. Control configuration.

In order to achieve the above object, the present invention proposes a mine water resource regulation and configuration method based on a surface reservoir, wherein the mine water resource regulation and configuration method includes:

S1) classify the mine water resources into clean mine water and dirty mine water;

S2) the clean mine water is reused on site and/or transported to the surface clean water reservoir for storage and utilization;

S3) pretreating the dirty mine water to obtain finished water that meets the discharge requirements;

S4) The product water is transported to the surface product water storage tank for storage for use.

The above-mentioned mine water resource control and configuration method, wherein, step S3) comprises the steps:

S31): classifying the dirty mine water into mine water containing suspended solids, acid mine water and high salinity mine water;

S32) respectively pre-processing the mine water containing suspended solids, the acid mine water and the high salinity mine water to obtain finished water that meets the discharge requirements.

The above-mentioned method for regulating and configuring mine water resources, wherein, in the step S32), the step of pre-processing the suspended solids-containing mine water includes: adding medicine to the suspended solids-containing mine water for coagulation, precipitation and filter.

The above-mentioned method for regulating and configuring mine water resources, wherein, in the step S32), the step of pre-processing the acid mine water comprises:

An alkaline agent is added to the acidic mine water for neutralization, and the neutralized liquid is filtered.

The above-mentioned method for regulating and configuring mine water resources, wherein the pH of the acidic mine water is less than 5.5.

The above-mentioned method for regulating and configuring mine water resources, wherein, in the step S32), the step of pre-processing the high salinity mine water includes:

The high-salinity mine water is subjected to chemical coagulation, precipitation, filtration and reverse osmosis desalination treatment in sequence.

The above-mentioned method for regulating and configuring mine water resources, wherein the reverse osmosis desalination treatment sequentially includes: first-level reverse osmosis, first-level concentrated water re-concentration, and second-level concentrated water re-concentration treatment.

The above-mentioned method for regulating and configuring mine water resources, wherein, in the step S32), the method further comprises: performing evaporative crystallization treatment on the wastewater obtained after the reverse osmosis desalination treatment.

In the above-mentioned method for regulating and configuring mine water resources, the evaporative crystallization treatment sequentially includes triple-effect evaporation, freezing and single-effect evaporation treatment.

The above-mentioned method for regulating and configuring mine water resources, wherein the suspended solids in the suspended solids-containing mine water include coal powder and/or mineral powder, and the salinity of the high salinity mine water is greater than 1000 mg/L.

As can be seen from the above, the method for regulating and configuring mine water resources provided by the present invention first classifies clean mine water and dirty mine water according to the properties of mine water resources, wherein the clean mine water is reused on-site and/or transported to the surface The clean water reservoir is stored and utilized, while the dirty mine water is pretreated to obtain finished water that meets the discharge requirements, and finally the finished water is transported to the surface finished water reservoir for storage for use. Through this method, mine water resources can be rationally utilized, which can effectively solve the problem of a large amount of mine water discharge, realize the storage and regulation and allocation of mine water resources, and alleviate the sharp difference between the safe and green development of coal resources, water resources supply, and ecological environmental protection. Contradictions and conflicting effects.

In addition, the mine water resource control and configuration method of the present invention uses different sewage pretreatment methods for different polluted mine waters to achieve the finished water discharge requirements. The method can not only effectively treat polluted mine water and make comprehensive utilization of water resources, but also It is also possible to minimize the use of chemicals required to treat foul mine water, while achieving the goal of reducing treatment costs.

Description of drawings

In order to illustrate the embodiments of the present invention or the existing technical solutions more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the existing technology. Obviously, the accompanying drawings in the following description are only the For some embodiments described in the invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the flow chart of the mine water resource regulation and configuration method of the present invention;

Fig. 2 is the schematic diagram of the concentrated salt water reservoir of the embodiment of the present invention;

3 is a schematic diagram of a product water reservoir of an embodiment of the present invention; and

4 is a flowchart of a method for regulating and configuring mine water resources according to an embodiment of the present invention.

In the drawings, the same components are given the same reference numerals. The drawings are not to actual scale.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, the mine water resource control and configuration method based on the surface reservoir of the present invention comprises the following steps:

S1) classify the mine water resources into clean mine water and dirty mine water;

S2) the clean mine water is reused on site and/or transported to the surface clean water reservoir for storage and utilization;

S3) pretreating the dirty mine water to obtain finished water that meets the discharge requirements;

S4) The product water is transported to the surface product water storage tank for storage for use.

The mine water resource regulation and configuration method of the invention effectively solves the problems of random discharge and storage of mine water, and realizes the regulation and configuration of mine water resources.

In addition, the method for regulating and configuring mine water resources based on the surface reservoir of the present invention can alleviate the sharp contradictions and conflicts between the safe and green development of coal resources, water resources supply, and ecological environmental protection, and realize the protection and utilization of water resources in coal mining areas and the ecological environment. Improved win-win goals.

Specifically, as shown in FIG. 4 , in the present invention, clean mine water and dirty mine water are collected and diverted by classification. Mine water mainly includes the natural inflow of mine mining and the advanced drainage water of the mine. The former is more scattered, and more polluted mine water is formed; the latter is more concentrated, and more clean mine water is formed. The dirty mine water mainly includes mine water with suspended solids (including coal powder and rock powder), high salinity mine water (salinity>1000mg/L) and acid mine water (pH<5.5). The use of mine water classification and collection system to implement targeted diversion and separation of mine clean sewage can save mine water upgrading and treatment costs.

The mine water resource regulation and configuration method of the present invention is based on the mine water resource regulation configuration of the surface reservoir. Since the water after advanced treatment is not allowed to be directly discharged, resulting in waste of water resources, the treated clean mine water is stored based on the surface reservoir and adjusted and configured. For example, storage in high water season, utilization in dry season; storage in winter and summer use, etc. The treated excess water is stored in the surface reservoir, which can be used as water for production and domestic use, as well as for plant greening, dust reduction, road spraying, etc.

Further, in a specific embodiment, according to the formation period of the mine water, the mine water is classified into the natural influx of mine mining and the mine advanced drainage water, and the mine water classification and collection system is used to mine the natural inflow of mine water and mine advanced drainage. The discharge water is divided into dirty mine water and clean mine water. Clean mine water meets the requirements for direct use. Therefore, in the method of the present invention, the clean mine water is usually transported to an underground clean water reservoir for on-site reuse and/or to a ground clean water reservoir for storage and utilization.

Preferably, it is the optimal utilization method to transport clean mine water to the underground clean water reservoir for on-site reuse. In the case of clean mine water), the excess clean mine water is transported to the ground clean water reservoir for storage and utilization, which can reduce the transportation cost. Of course, the method of the present invention also includes simultaneously transporting the clean mine water to the ground clean water reservoir for storage and utilization and the underground clean water reservoir for on-site reuse, which is not specifically limited here. Further, the storage and utilization of ground clean water reservoirs and the on-site reuse of underground clean water reservoirs include water for production, domestic use, greening, dust suppression and clean water.

Further, for polluted mine water, according to the physical and chemical characteristics of polluted mine water, the mine water classification and collection system is used to implement the targeted diversion and separation of mine clean sewage, and the polluted mine water is classified into mine water containing suspended solids (coal-containing mine water). powder, rock powder), high salinity mine water (salinity>1000mg/L) and acid mine water (pH<5.5). For example, the mine water classification and collection system may include an online monitoring unit, and according to the characteristics of the polluted mine water monitored by the online monitoring unit, the polluted mine water is classified into Mine water (salinity>1000mg/L) and acid mine water (pH<5.5), and the above three types of polluted mine water of different types are respectively discharged to the corresponding underground water tank, and then transported to the corresponding adjustment tank for treatment .

Specifically, for the mine water containing suspended solids, the mine water containing suspended solids is first transported to the adjustment tank, and then subjected to dosing, coagulation and sedimentation treatment in the clarification tank, and after this operation, the filtration treatment is carried out in the filter tank, and the obtained clear water is discharged. To the clean water pool for use, or the finished water of the clean water pool can be output to the ground product water storage tank.

For acid mine water, here refers to dirty mine water with a pH value of less than 5.5, which is transported to the underground water tank and the adjustment tank in turn, and then limestone is added to the clarification tank for neutralization. Limestone neutralization operation is carried out in the process of filtration, and then the filtration operation is carried out in the filter tank, wherein the obtained sediment is discharged as sludge, and the clean water (that is, the liquid obtained after filtration) is transported to the drainage tank for use. Of course, it is also possible to Discharge the clean water in the clear water tank to the ground clean water storage tank for storage and utilization.

For the well water of the high salinity layer, firstly the well water of the high salinity layer is transported to the adjustment tank, and then the clarification tank is subjected to dosing, coagulation and precipitation treatment. It is discharged to the clear water tank for further treatment, the obtained filtrate is treated as sludge, and the liquid in the clear water tank is transported to the high-salinity water storage tank and then subjected to reverse osmosis desalination of high-salinity water, thereby obtaining concentrated brine and finished water respectively. (that is, water with low salt content after advanced treatment), the concentrated brine is evaporated and crystallized to obtain sodium sulfate/sodium chloride crystals, and the finished water is transported to the ground finished water storage tank for storage.

Further, the reverse osmosis desalination treatment of high-salinity water is described in detail below.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

The first level of Hongqinghe Coal Mine mainly mines 3-1 coal, the coal seam is buried at a depth of about 680m, and the overlying strata are mainly Quaternary, Tertiary, Cretaceous and Pauline strata. The main aquifers in Hongqinghe Coal Mine are divided into two layers. The first aquifer is the lower Cretaceous Zhidan Group clastic rock pore, fractured aquifer and the Quaternary loose layer aquifer, and the second aquifer is the Jumbo aquifer. The clastic rock-like pore and fissure confined water aquifers from the Anding Formation to the 3rd coal seam bottom, and the aquifers that affect the excavation project are mainly the second aquifers.

The normal water inflow of Hongqinghe Coal Mine is 425m ³ /h, the maximum water inflow is 580m ³ /h, the mine water inflow has a high salinity, TDS=3000mg/l, and many water quality indicators exceed the standard, the ordinary flocculation + sedimentation filtration treatment process , can only remove conventional indicators such as suspended solids in water, can not reduce the salinity of water, can not meet the requirements of coal mine production and domestic reuse water, can not achieve the "zero discharge" requirements of mine water in the environmental impact assessment, so the depth of mine water must be carried out. deal with.

The mine drainage system is: 5 sets of MDS450-95×8(p) type water pumps are arranged in the central water pump room of the mine, the flow rate of each pump is 450m ³ /h and the lift is 732m. During normal water inflow, 2 units work; when the maximum water inflow occurs, 4 units work. The main drainage pipeline is made of 3 times of D325 seamless steel pipe, which is laid to the ground through the auxiliary shaft shaft through the pipeline. The forced drainage system is equipped with 2 sets of BQ550-726/19-1800/WS mining submersible electric pumps, each pump has a flow rate of 550m ³ /h and a lift of 726m. On the ground, the drainage capacity of the system is 900m ³ /h, which meets the drainage requirements. The drainage system of the north wing is as follows: there is no water tank in the mining area of the north wing, and the mine water in the excavation face is discharged to the Daxiang ditch and two DN325 drainage pipes through the trough pipeline, and then discharged from the Daxiang ditch and the north wing drainage pipeline. to the central water tank. The drainage system of the south wing is as follows: there is no water tank in the mining area of the south wing, and the mine water in the excavation face is discharged to the main ditch through the pipeline along the channel, and then flows from the main ditch to the central water tank.

The advanced treatment of mine water in Hongqinghe Coal Mine (i.e. high salinity water reverse osmosis desalination treatment process) includes two units, membrane concentration unit and evaporative crystallization, with a designed processing capacity of 600m ³ /h. The process route of the membrane concentration unit of the advanced mine water treatment plant is "first-level reverse osmosis (RO) + first-level concentrated water re-concentration (BWRO) + second-level concentrated water re-concentration (DTRO)". Among them, the first-stage reverse osmosis (RO) is concentrated 4 times, TDS=12000mg/L, the working pressure is 0.6MPa; the first-stage concentrated water is concentrated again (BRO) is concentrated 3 times, TDS=3600mg/L, the working pressure is 2.5MPa; The water is re-concentrated (OTRO) to concentrate twice, TDS=7200mg/L, and the working pressure is as high as 8MPa. The process route of evaporative crystallization of mine water advanced treatment plant is "three-effect evaporation + freezing + single-effect evaporation", which can crystallize secondary concentrated brine (TDS=6000-9000mg/L) into high-purity sodium sulfate and sodium chloride crystals , to realize the resource utilization of solid waste.

The mine is equipped with two surface reservoirs for storing concentrated brine, each 40000m ³ , a total of 80000m ³ . Another 1,200,000m ³ surface reservoir was constructed in the mine to store the deeply treated water. The surface reservoir is a trapezoid-like structure with a bottom area of 80,000m ² (280m×280m), an upper opening of 90,000m ² (300m×300m), and a vertical height of 14m. (As shown in Figure 3). The surface water storage tank plays the role of storing and regulating the allocation of water resources. Usually, the processed water is stored in the surface water storage tank. When using, it is uniformly adjusted and configured according to the water demand of each unit, department, and link.

Further, the number of surface reservoirs is determined according to the water quality. If it is high-salinity mine water, 2 reservoirs of high-concentration brine and 1 reservoir of product water after advanced treatment need to be configured; For suspended solids mine water or acid mine water, a product water reservoir needs to be configured on the well. The shape of the reservoir is trapezoid, the size of the lower part is generally 60-280m, the size of the upper part is generally 80-300m, and the depth is generally 6-15m (as shown in Figure 2).

The quality TDS of the advanced treated water is less than 1000mg/L, which meets the "Drinking Water Sanitation Standard" (GB5749-2006), and the recovery rate can reach 95%. In addition to meeting the production and daily use of coal mines, the finished water can also be used for the greening of the mining area and surrounding vegetation, as well as for sprinkling and dust reduction in the field and coal transportation roads in summer. It can reduce the scaling and corrosion of mining equipment and heating facilities and prolong the service life of equipment.

As mentioned above, the present invention has the following beneficial effects: adopting mine water classification collection, diversion and grading treatment, namely underground pretreatment and ground depth treatment methods, underground multiplexing and ground storage and reuse two methods to mine well Water resources preparation, the use of ground reservoirs to uniformly control and allocate mine water resources to realize the storage and reuse of mine water resources, has good economic and environmental benefits.

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the spirit of the present invention, the above embodiments or There may also be combinations between technical features in different embodiments, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Embodiments of the present invention are intended to cover all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of mine water resource based on surface storage pond regulates and controls configuration method, which is characterized in that

The mine water resource regulates and controls configuration method

S1 mine water resource) is sorted out into clean mine water and dirty mine water；

S2) the clean mine water is multiplexed and/or is delivered on the spot the storage of earth's surface clean water reservoir and utilizes；

S3 the dirty mine water is pre-processed) the product water of emission request must be reached；

S4 the product water) is delivered to the storage of earth's surface product water reservoir in case using.

2. mine water resource according to claim 1 regulates and controls configuration method, which is characterized in that

Step S3) comprising steps of

S31): the dirty mine water is classified as mine water containing suspended substances, acid mine water and highly mineralized mine water；

S32) mine water containing suspended substances, the acid mine water and the highly mineralized mine water are located in advance respectively It manages so that the product water of emission request must be reached.

3. mine water resource according to claim 2 regulates and controls configuration method, which is characterized in that

In the step S32) in, carrying out pretreated step to the mine water containing suspended substances includes:

To the mine water containing suspended substances dosing coagulation, precipitates and be filtered.

4. mine water resource according to claim 2 regulates and controls configuration method, which is characterized in that

In the step S32) in, carrying out pretreated step to the acid mine water includes:

Alkaline agent is added into the acid mine water to be neutralized, the liquid after neutralization is filtered.

5. mine water resource according to any one of claim 2 to 4 regulates and controls configuration method, which is characterized in that

The pH of the acid mine water is less than 5.5.

6. mine water resource according to any one of claim 2 to 4 regulates and controls configuration method, which is characterized in that

In the step S32) in, carrying out pretreated step to the highly mineralized mine water includes:

The highly mineralized mine water is successively carried out to handle at dosing coagulation, precipitating, filtering and reverse osmosis deaslination.

7. mine water resource according to claim 6 regulates and controls configuration method, which is characterized in that

Processing successively includes: first-stage reverse osmosis at the reverse osmosis deaslination, level-one concentrated water is concentrated again, place is concentrated in second level concentrated water again Reason.

8. mine water resource according to claim 7 regulates and controls configuration method, which is characterized in that

In the step S32) in further include: the waste water obtained after handling at the reverse osmosis deaslination is evaporated at crystallization Reason.

9. mine water resource according to claim 7 regulates and controls configuration method, which is characterized in that

The evaporative crystallization processing successively includes triple effect evaporation, freezing and single effect evaporation processing.

10. mine water resource according to claim 2 regulates and controls configuration method, which is characterized in that

Suspended matter in the mine water containing suspended substances includes coal dust and/or miberal powder, the salinity of the highly mineralized mine water Greater than 1000mg/L.