Hypersalinity mine water resource treatment system

Abstract

The utility model discloses a high-salinity mine water resource chemical treatment system. The high-salinity mine water resource regeneration treatment system comprises a silicon carbide membrane direct filtration device, a reverse osmosis concentration device, a hardness removal device, a centrifugal device, a slurry preparation device and a fluidized bed reaction device which are connected in sequence. And the silicon carbide film direct filtration device is used for removing suspended matters in mine water. The reverse osmosis concentration device is used for adding a scale inhibitor to concentrate the mine water, so that calcium ions and sulfate ions are enriched on the reverse osmosis concentrated water side. The hardness removal device is used for adding a destabilizing agent to carry out hardness removal treatment on the concentrated water of the reverse osmosis concentration device. And the centrifugal device is used for carrying out centrifugal treatment on the gypsum concentrated liquor obtained by the hardness removal device. And the slurry preparation device is used for adding ammonia water and preparing the ammonia water and gypsum from the centrifugal device into slurry. The fluidized bed reaction device is used for introducing carbon dioxide gas to react with the slurry to generate calcium carbonate and ammonium sulfate. The process flow can be effectively shortened, the automation degree is improved, and the operation cost is reduced.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a resource-based treatment system for high-mineralization mine water. Background Technology

[0002] High-mineralization mine water, also known as saline mine water, generally refers to mine water with a salt content greater than 1000 mg / L. The water quality of this type of saline mine water is mostly neutral or slightly alkaline, and the calcium content in the water is high. 2+ Mg 2+ Na + SO4 2- Cl - The plasma has a high concentration and hardness, with a mineralization mostly ranging from 1000 mg / L to 4000 mg / L, and reaching a maximum of 15000 mg / L. Currently, traditional technologies mainly employ a process of "pretreatment + membrane salt concentration + evaporation / freeze crystallization" to achieve zero-discharge treatment of mine water, with the produced water being recycled and reused, and sodium chloride and sodium sulfate as byproducts.

[0003] In traditional zero-discharge treatment technologies, the goal of pretreatment processes is to remove suspended solids and calcium and magnesium ions from mine water. These suspended solids are mostly coal dust and rock dust, with small particle sizes and low densities, making natural sedimentation difficult. Scaling ions in mine water are typically removed using the dual-alkali method (sodium hydroxide / lime + sodium carbonate). While the dual-alkali method is technically mature and has high hardening removal efficiency, it still requires excessive addition of reagents to ensure complete reaction. Reagent costs account for 30% to 50% of the total treatment cost, resulting in poor long-term economic viability. Furthermore, the large amount of sludge generated by the dual-alkali method is difficult to utilize and is often directly treated as waste. Pretreated mine water requires further membrane salt concentration to achieve product aggregation. However, membrane salt concentration + evaporation / freeze crystallization technology suffers from problems such as long process duration and high investment and operating costs. Utility Model Content

[0004] Therefore, it is necessary to provide a high-mineralization mine water resource treatment system. The high-mineralization mine water resource treatment system of this application can effectively shorten the process flow, improve the degree of automation, reduce operating costs, and increase the utilization rate of by-products.

[0005] One embodiment of this application provides a high-mineralization mine water resource treatment system.

[0006] A high-mineralization mine water resource treatment system includes a silicon carbide membrane direct filtration unit, a reverse osmosis concentration unit, a hardening removal unit, a centrifuge unit, a slurry preparation unit, and a fluidized bed reactor connected in sequence. The silicon carbide membrane direct filtration unit removes suspended solids from the mine water. The reverse osmosis concentration unit adds an antiscalant to concentrate the mine water, enriching the concentrate with calcium and sulfate ions. The hardening removal unit adds a destabilizing agent to remove hardness from the concentrate. The centrifuge unit centrifuges the gypsum concentrate obtained from the hardening removal unit. The slurry preparation unit adds ammonia and mixes it with the gypsum from the centrifuge unit to form a slurry. The fluidized bed reactor introduces carbon dioxide gas to react with the slurry to generate calcium carbonate and ammonium sulfate.

[0007] In some embodiments, the high-mineralization mine water resource treatment system further includes a pre-sedimentation tank located upstream of and connected to the silicon carbide membrane direct filtration device. The pre-sedimentation tank is used to pre-sedimentate the mine water to be treated to reduce the suspended solids content in the mine water.

[0008] In some embodiments, the centrifuge is also connected to the pre-sedimentation tank, and the supernatant after centrifugation is returned to the pre-sedimentation tank for recycling and re-sedimentation.

[0009] In some embodiments, the SS of the product water from the silicon carbide membrane direct filtration device is <2 mg / L.

[0010] In some embodiments, the concentration of calcium ions and sulfate ions enriched on the reverse osmosis concentrate side of the reverse osmosis concentration unit is 4 to 6 times the solubility product of calcium sulfate.

[0011] In some embodiments, the reverse osmosis concentration unit is also connected to the centrifuge unit to allow the permeate from the reverse osmosis concentration unit to be recycled into the centrifuge unit.

[0012] In some embodiments, the top of the fluidized bed reactor is used to feed the slurry.

[0013] In some embodiments, the bottom of the fluidized bed reactor is used to introduce carbon dioxide gas.

[0014] In some embodiments, the high-mineralization mine water resource treatment system further includes a separation device located downstream of and connected to the fluidized bed reactor, the separation device being used to separate calcium carbonate and ammonium sulfate produced from the fluidized bed reactor.

[0015] In some embodiments, the hardening device includes a hardening reactor.

[0016] In some embodiments, the centrifugation device includes a centrifuge, the centrifugation device having a rotation speed controlled at 1000 rpm to 2000 rpm.

[0017] In some embodiments, the mixing device includes a mixing tank, a stirring blade rotatably connected to the mixing tank, and a stirring drive component connected to the stirring blade, the stirring drive component being used to drive the stirring blade to rotate.

[0018] In some embodiments, the high-mineralization mine water resource treatment system further includes an ammonium sulfate crystallization device, which is located downstream of and connected to the fluidized bed reactor, and is used to crystallize ammonium sulfate.

[0019] In some embodiments, the ammonium sulfate crystallization device is connected downstream of and to the separation device, and is used to crystallize the ammonium sulfate obtained from the separation device.

[0020] The aforementioned high-mineralization mine water resource treatment system can effectively shorten the process flow, improve the degree of automation, reduce operating costs, and increase the utilization rate of by-products.

[0021] Compared with traditional technologies, the high-mineralization mine water resource treatment system of this application has the following beneficial effects:

[0022] (1) The use of silicon carbide membrane direct filtration to remove suspended solids in mine water significantly shortens the process flow, improves the system automation level, and reduces operating costs.

[0023] (2) Reverse osmosis membrane concentration is adopted to allow calcium sulfate in mine water to crystallize at room temperature, thereby removing calcium ions by utilizing the sulfate ions in the wastewater itself, saving the dosage of calcium removal agents and reducing the cost of salt separation.

[0024] (3) Calcium sulfate obtained from the production is used and ammonia water is added to prepare calcium carbonate and ammonium sulfate. Ammonium sulfate can be used as agricultural fertilizer, and calcium carbonate can be used for power plant flue gas desulfurization, building materials and industrial fillers, which improves the utilization rate of by-products.

[0025] (4) Calcium carbonate and ammonium sulfate were prepared by using the calcium sulfate-ammonia method to capture CO2, thus fixing and storing CO2 greenhouse gas. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0028] Figure 1 This is a schematic diagram of a high-mineralization mine water resource treatment system according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures

[0030] 10. High-mineralization mine water resource treatment system; 100. Silicon carbide membrane direct filtration device; 200. Reverse osmosis concentration device; 300. Hardness removal device; 400. Centrifuge device; 500. Slurry preparation device; 600. Fluidized bed reactor; 700. Pre-sedimentation tank; 800. Separation device. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] In this document, "optionally," "optionally," and "optional" mean that something is optional, that is, it is selected from either "with" or "without." If multiple "options" appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "option" is independent. In this application, descriptions such as "optionally contains" and "optionally includes" indicate "contains or does not contain."

[0038] In this application, when numerical intervals (i.e., numerical ranges) are mentioned, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0039] This application provides a high-mineralization mine water resource treatment system to address at least one of the following technical problems in the traditional "pretreatment + membrane salt concentration + evaporation / freeze crystallization" process for saline mine water: (1) the dual-alkali method for treating scaling ions has poor long-term economic efficiency, and the large amount of sludge generated is difficult to utilize and is wasted as waste; (2) the membrane salt concentration + evaporation / freeze crystallization technology has problems such as long process and high investment and operating costs; (3) the pretreatment process has a long process flow, large footprint, high operating costs, and low automation; (4) the by-products - industrial-grade sodium chloride and sodium sulfate - have problems of large output and difficulty in downstream sales. The high-mineralization mine water resource treatment system will be described below with reference to the accompanying drawings.

[0040] The high-salinity mine water resource treatment system 10 provided in this application embodiment is exemplary; please refer to [link to example]. Figure 1 As shown, Figure 1 This is a schematic diagram of the high-mineralization mine water resource treatment system 10 provided in an embodiment of this application. The high-mineralization mine water resource treatment system 10 of this application can be used for the resource treatment of high-mineralization mine water and can achieve the effects of short process, high degree of automation and low operating cost.

[0041] To more clearly illustrate the structure of the high-mineralization mine water resource treatment system 10, the following will describe the high-mineralization mine water resource treatment system 10 in conjunction with the accompanying drawings.

[0042] For example, please refer to Figure 1As shown, a high-mineralization mine water resource treatment system 10 includes a silicon carbide membrane direct filtration unit 100, a reverse osmosis concentration unit 200, a hardening removal unit 300, a centrifuge unit 400, a slurry preparation unit 500, and a fluidized bed reactor 600 connected in sequence. The silicon carbide membrane direct filtration unit 100 is used to remove suspended solids from the mine water. The reverse osmosis concentration unit 200 is used to add scale inhibitors to concentrate the mine water, resulting in the enrichment of calcium and sulfate ions on the reverse osmosis concentrate side. The hardening removal unit 300 is used to add destabilizing agents to remove hardness from the concentrate of the reverse osmosis concentration unit 200. Adding destabilizing agents to the hardening removal unit 300 breaks down the scale inhibitors, releasing calcium ions, which then combine with sulfate ions to produce calcium sulfate crystals. The calcium sulfate crystals settle and are discharged from the bottom of the hardening removal unit 300 to the centrifuge unit 400. The centrifuge unit 400 is used to centrifuge the gypsum concentrate obtained from the hardening removal unit 300. The slurry preparation unit 500 is used to add ammonia water and mix it with gypsum from the centrifuge unit 400 to form a slurry. The fluidized bed reactor 600 is used to introduce carbon dioxide gas to react with the slurry to produce calcium carbonate and ammonium sulfate.

[0043] The aforementioned high-mineralization mine water resource treatment system 10 can effectively shorten the process flow, improve the degree of automation, reduce operating costs, and increase the utilization rate of by-products.

[0044] In some of these embodiments, please refer to Figure 1 As shown, the high-mineralization mine water resource treatment system 10 also includes a pre-sedimentation tank 700. The pre-sedimentation tank 700 is located upstream of and connected to the silicon carbide membrane direct filter device 100. The pre-sedimentation tank 700 is used to pre-sedimentate the mine water to be treated to reduce the suspended solids content in the mine water.

[0045] In some embodiments, the centrifuge device 400 is also connected to the silicon carbide membrane direct filtration device 100. The supernatant after centrifugation by the centrifuge device 400 is returned to the silicon carbide membrane direct filtration device 100 for recirculation and refiltration.

[0046] In some of these embodiments, the SS (suspended solids) in the product water of the silicon carbide membrane direct filtration device 100 is <2 mg / L.

[0047] In some embodiments, the concentration of calcium ions and sulfate ions enriched on the reverse osmosis concentrate side of the reverse osmosis concentration unit 200 is 4 to 6 times the solubility product of calcium sulfate.

[0048] In some embodiments, the reverse osmosis concentration unit 200 is also connected to the centrifuge unit 400 to allow the permeate from the reverse osmosis concentration unit 200 to enter the centrifuge unit 400 for reuse.

[0049] In some embodiments, the top of the fluidized bed reactor 600 is used to add slurry.

[0050] In some embodiments, the bottom of the fluidized bed reactor 600 is used to introduce carbon dioxide gas.

[0051] In some of these embodiments, please refer to Figure 1 As shown, the high-mineralization mine water resource treatment system 10 also includes a separation device 800. The separation device 800 is located downstream of and connected to the fluidized bed reactor 600. The separation device 800 is used to separate calcium carbonate and ammonium sulfate produced from the fluidized bed reactor 600.

[0052] In some embodiments, the hardening device 300 includes a hardening reactor.

[0053] In some embodiments, the centrifugation device 400 includes a centrifuge. The rotational speed of the centrifugation device 400 is controlled to be between 1000 rpm and 2000 rpm. For example, the rotational speed of the centrifugation device 400 may include, but is not limited to, 1000 rpm, 1200 rpm, 1400 rpm, 1500 rpm, 1600 rpm, 1800 rpm, 2000 rpm, or a range between any two of the foregoing.

[0054] In some embodiments, the slurry mixing device 500 includes a mixing tank, a stirring blade rotatably connected to the mixing tank, and a stirring drive component connected to the stirring blade. The stirring drive component is used to drive the stirring blade to rotate.

[0055] In some of these embodiments, please refer to Figure 1 As shown, the high-mineralization mine water resource treatment system 10 also includes an ammonium sulfate crystallization device. The ammonium sulfate crystallization device is located downstream of and connected to the fluidized bed reactor 600, and is used to crystallize ammonium sulfate.

[0056] In some embodiments, an ammonium sulfate crystallization device is connected downstream of and to the separation device 800, and is used to crystallize the ammonium sulfate obtained by the separation device 800.

[0057] In some embodiments, the scale inhibitor in this application includes calcium sulfate.

[0058] In some embodiments, ammonia and calcium sulfate in the slurry mixing device 500 are mixed in a certain proportion to form a slurry. The slurry is added from the top of the fluidized bed reactor 600, and CO2 gas is introduced from the bottom of the fluidized bed reactor 600 at a certain flow rate. The reaction time between the slurry and CO2 gas in the slurry mixing device 500 is 90 min to 120 min, producing calcium carbonate and ammonium sulfate. For example, the reaction time between the slurry and CO2 gas in the slurry mixing device 500 includes, but is not limited to: 90 min, 95 min, 100 min, 105 min, 110 min, 115 min, 120 min, or any range between the foregoing.

[0059] In some embodiments, the CO2 gas flow rate in the slurry preparation device 500 is 300 mL / min to 400 mL / min. For example, the CO2 gas flow rate in the slurry preparation device 500 may include, but is not limited to, 300 mL / min, 320 mL / min, 340 mL / min, 350 mL / min, 370 mL / min, 390 mL / min, 400 mL / min, or any range between the foregoing.

[0060] In some embodiments, the solid-liquid ratio between ammonia and calcium sulfate in the slurry mixing device 500 is 1:3 to 1:4. For example, the value of the solid-liquid ratio between ammonia and calcium sulfate in the slurry mixing device 500 includes, but is not limited to, 1:3, 1:3.5, 1:4, or any range between the foregoing.

[0061] In summary, compared with traditional technologies, the high-mineralization mine water resource treatment system 10 of this application has the following beneficial effects:

[0062] (1) The use of silicon carbide membrane direct filtration to remove suspended solids in mine water significantly shortens the process flow, improves the system automation level, and reduces operating costs.

[0063] (2) Reverse osmosis membrane concentration is adopted to allow calcium sulfate in mine water to crystallize at room temperature, thereby removing calcium ions by utilizing the sulfate ions in the wastewater itself, saving the dosage of calcium removal agents and reducing the cost of salt separation.

[0064] (3) Calcium sulfate obtained from the production is used and ammonia water is added to prepare calcium carbonate and ammonium sulfate. Ammonium sulfate can be used as agricultural fertilizer, and calcium carbonate can be used for power plant flue gas desulfurization, building materials and industrial fillers, which improves the utilization rate of by-products.

[0065] (4) Calcium carbonate and ammonium sulfate were prepared by using the calcium sulfate-ammonia method to capture CO2, thus fixing and storing CO2 greenhouse gas.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A high salinity mine water resource treatment system, characterized in that, The system comprises, in sequence, a silicon carbide membrane direct filtration device, a reverse osmosis concentration device, a hardness removal device, a centrifugal device, a slurry preparation device, and a fluidized bed reaction device; the silicon carbide membrane direct filtration device is used to remove suspended solids in the mine water; the reverse osmosis concentration device is used to add a scale inhibitor to concentrate the mine water, so that the reverse osmosis concentrated water side is enriched in calcium ions and sulfate ions; the hardness removal device is used to add a destabilizing agent to remove hardness from the concentrated water of the reverse osmosis concentration device; the centrifugal device is used to centrifugally treat the gypsum concentrated liquid obtained from the hardness removal device; the slurry preparation device is used to add ammonia water and configure the gypsum from the centrifugal device into a slurry; and the fluidized bed reaction device is used to introduce carbon dioxide gas to react with the slurry to generate calcium carbonate and ammonium sulfate.

2. The high salinity mine water resource recovery system of claim 1, wherein, The high-salinity mine water resource treatment system further comprises a pre-sedimentation tank upstream of and connected to the silicon carbide membrane direct filtration device, which is used to pre-sediment the mine water to be treated to reduce the content of suspended solids in the mine water.

3. The high salinity mine water resource recovery system of claim 1, wherein, The water produced by the silicon carbide membrane direct filtration device has an SS of less than 2 mg / L.

4. The high salinity mine water resource recovery system of claim 1, wherein, The concentration of calcium ions and sulfate ions enriched on the reverse osmosis concentrated water side of the reverse osmosis concentration device is 4 to 6 times the solubility product of calcium sulfate.

5. The high salinity mine water resource recovery system of claim 1, wherein, The reverse osmosis concentration device is further connected to the centrifugal device to enable the water produced by the reverse osmosis concentration device to be reused in the centrifugal device.

6. The system for the treatment of high-salinity mine water according to any one of claims 1 to 5, characterized in that, The top of the fluidized bed reaction device is used to add the slurry; And / or, the bottom of the fluidized bed reaction device is used to introduce carbon dioxide gas.

7. The system for the treatment of high-salinity mine water according to any one of claims 1 to 5, characterized in that, The high-salinity mine water resource treatment system further comprises a separation device downstream of and connected to the fluidized bed reaction device, which is used to separate the calcium carbonate and ammonium sulfate produced from the fluidized bed reaction device.

8. The system for the treatment of high-salinity mine water according to any one of claims 1 to 5, characterized in that, The hardness removal device comprises a hardness removal reactor. And / or, the centrifugal device comprises a centrifuge, and the rotational speed of the centrifugal device is controlled to be 1000 rpm to 2000 rpm.

9. The high salinity mine water resource treatment system according to any one of claims 1 to 5, characterized in that, The slurry preparation device comprises a stirring tank, a stirring paddle rotatably connected to the stirring tank, and a stirring driving component connected to the stirring paddle, which is used to drive the stirring paddle to rotate.

10. The high salinity mine water resource recovery system according to any one of claims 1 to 5, characterized in that, The high-salinity mine water resource treatment system further comprises an ammonium sulfate crystallization device downstream of and connected to the fluidized bed reaction device, which is used to crystallize the ammonium sulfate.

Images