Hydrogenation treatment method and application of mine water with high mineralization degree and high organic matter

Abstract

The invention discloses a high-mineralization-degree and high-organic-matter mine water resource regeneration treatment method and application, and the method comprises the following steps: removing suspended matters in mine water to be treated, preparing carbon dots in the mine water, coating and separating the carbon dots in the mine water, and drying a salt matrix coated carbon dot compound to obtain a multicolor solid fluorescent carbon dot salt compound. The preparation method is simple, the product yield is high, resource utilization is achieved, the method is green, economical and environmentally friendly, the carbon dot salt solid powder with efficient luminescence performance is obtained, and resource utilization of organic matter and high salt in mine water is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mine water treatment, and in particular to a resource treatment method and application of high-mineralization and high-organic-matter mine water. Background Art

[0002] Coal mine water is groundwater that enters the tunnel during coal mining. According to relevant statistics, my country produces about 7 billion cubic meters of mine water each year, which is an important unconventional water resource. However, affected by the coal mining process and geological conditions, mine water usually contains a certain amount of organic matter (mainly organic acids and amino sugars) and a large amount of Ca2+, Mg2+, HCO3-, and SO42- ions (the total amount is usually greater than 3000 mg / L), showing typical characteristics of high mineralization and high organic matter. The presence of these impurities requires coal mining enterprises to treat them, and only after meeting the standards can they be discharged or used as resources. At present, the treatment process and technology of high-mineralization and high-organic mine water mainly include precipitation, coagulation precipitation, coagulation precipitation filtration, cleaning and sewage diversion method, membrane separation, etc. However, these treatment processes generally have a series of problems such as high equipment investment, large footprint, complex process, high operating technology requirements, and high operating costs, resulting in huge environmental and economic pressures on coal mining enterprises. Therefore, it is urgent to find a new method for treating high-mineralization and high-organic-matter mine water.

[0003] Carbon dots, as a new type of carbon-based nanoluminescent materials, have attracted great attention from chemists and material scientists in recent years due to their simple preparation method, rich carbon sources, excellent luminescent properties and high application value. Usually, the preparation of highly efficient luminescent carbon dots is mainly completed by heating an aqueous solution containing a certain concentration of organic matter (containing elements such as C, H, O, etc.). However, the prepared carbon dots often have fluorescence quenching caused by aggregation, which seriously limits their application in the field of solid-state luminescence. Summary of the invention

[0004] In view of the above-mentioned problems, the purpose of the present invention is to provide a method and application for resource treatment of high-mineralization and high-organic matter mine water. The preparation method is simple, the product yield is high, resource utilization is achieved, and it is green, economical and environmentally friendly. Solid carbon point salt powder with high-efficiency luminescent properties can be obtained, thereby achieving resource utilization of organic matter and high salt in mine water.

[0005] A method for resource treatment of high-mineralization and high-organic-matter mine water comprises the following steps:

[0006] S1 Removal of suspended solids in the treated mine water: first add a coagulant aqueous solution to the treated mine water, stir and react for 1 to 3 minutes; then add a flocculant aqueous solution, stir and react again; stand and separate to obtain a clarified upper layer mine water aqueous solution A;

[0007] S2 Preparation of carbon dots in mine water: The obtained mine water aqueous solution A is heated for 4 to 12 hours until the solution becomes a dark brown liquid, and then naturally cooled to room temperature to obtain a mine water crude liquid B containing carbon dots;

[0008] S3 Coating and separation of carbon dots in mine water: After the reaction is completed, the obtained crude liquid B is placed in a stirring device, and then alkali solution is slowly added until no precipitation is generated, forming a turbid liquid C of carbon dots coated with precipitated salt; the turbid liquid C is centrifuged to obtain a carbon dot complex coated with a salt-containing matrix;

[0009] S4 Drying of the salt matrix coated carbon dot complex: The carbon dot complex obtained after centrifugation is dried to obtain a multicolor solid fluorescent carbon dot salt complex.

[0010] Furthermore, in step S1, the coagulant aid is selected from one of polyaluminium chloride and polydiallyldimethylammonium chloride, with a mass concentration of 2-10wt%, and an addition ratio of 1-2‰ of the mine water to be treated; the flocculant is selected from polyacrylamide, with a mass concentration of 0.05wt%, and an addition ratio of 0.5-2‰ of the mine water to be treated.

[0011] Furthermore, in step S1, the mine water to be treated contains water-soluble organic matter and high-mineralization ions, wherein the turbidity range is 10-50 mg / L, the mineralization range is 2415-5208 mg / L and the water-soluble organic matter content range is 774-1213 mg / L, the water-soluble organic matter includes one or more of organic acids and amino sugars, and the high-mineralization ions are selected from Ca2+, Mg2+, HCO3- and SO42-.

[0012] Furthermore, in step S2, the heating temperature is 160-300° C., and the heating time is 2-24 hours.

[0013] Furthermore, in step S1 and step S2, by adjusting the concentration and dosage of the coagulant / flocculant, as well as the drying temperature and heating time, a blue solid-state fluorescent carbon dot salt complex, a blue-green solid-state fluorescent carbon dot salt complex, a pure green solid-state fluorescent carbon dot salt complex, a yellow-green solid-state fluorescent carbon dot salt complex and a pure yellow solid-state fluorescent carbon dot salt complex are obtained respectively; in step S3, by using different alkali solutions, solid-state fluorescent carbon dot salt complexes with different luminescence efficiencies and desalination efficiencies are obtained.

[0014] Furthermore, the key parameters corresponding to the synthesis of the blue fluorescent carbon dot salt complex are as follows: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the amounts used are 1‰ and 0.5‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 160°C and the heating time is 4h;

[0015] Key parameters corresponding to the synthesis of blue-green fluorescent carbon dot salt complexes: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the dosages are 1.3‰ and 0.8‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 180°C and the heating time is 4h;

[0016] Key parameters corresponding to the synthesis of pure green fluorescent carbon dot salt complexes: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the dosages are 1.5‰ and 1‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 200℃ and the heating time is 6h;

[0017] Key parameters corresponding to the synthesis of yellow fluorescent carbon dot salt complexes: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the dosages are 2‰ and 1‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 220°C and the heating time is 10h;

[0018] The key parameters corresponding to the synthesis of orange fluorescent carbon dot salt complexes are as follows: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the amounts are 2‰ and 2‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 240°C and the heating time is 12h.

[0019] Furthermore, in step S3, the mass fraction of the added alkali solution is 0.1-10%, and the alkali solution is selected from one of sodium hydroxide, potassium hydroxide or barium hydroxide.

[0020] Furthermore, in step S4, the drying treatment is to dry the carbon dot composite in a vacuum oven at a heating temperature of 40 to 80° C. for a heating time of 1 to 8 hours.

[0021] The second object of the present invention is to provide the application of the method in synthesizing multicolor solid-state fluorescent carbon dot salt complexes.

[0022] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0023] The beneficial effects of the present invention are:

[0024] The preparation method of the present invention is simple. Using water-soluble organic matter in mine water as a carbon source and ions in mine water as a salt matrix, compared with existing mine water treatment technologies (including reverse osmosis membrane concentration, evaporation crystallization and physical adsorption, etc.), a simple oven heating reaction, precipitation separation and drying treatment are performed under normal pressure. The method is not only simple in steps and low in investment, but also greatly reduces the cost of mine water treatment, and a carbon point salt complex powder with high-efficiency luminescence performance can be obtained;

[0025] The product prepared by the present invention has a high yield. This method not only has a high yield (85%) and good luminous efficiency (41%), but also has a wide color coverage (427-589nm); the prepared multicolor solid fluorescent carbon dot salt complex can be used in the fields of light-emitting device construction, fluorescent ink preparation, 3D printing, etc., and has good application prospects;

[0026] The present invention realizes resource utilization. Based on the preparation method of the new nano-luminescent material carbon dots, the mine water with high mineralization and high organic matter is first heated to produce carbon dots, and then an alkali solution is introduced to generate a precipitated salt-coated carbon dot composite material. The non-radiative transition of excitons is suppressed by the salt matrix coating method, thereby realizing the solid-state luminescence of the carbon dots. For the first time, the resource utilization of soluble organic matter and high-mineralization ions in mine water is realized, and the chemical waste generated in the above-mentioned treatment process can be converted into a new nano-luminescent material with high value, which provides a new idea for treating difficult mine water.

[0027] The invention is green, economical and environmentally friendly. The organic matter content and high salt ion content of the mine water treated in the above manner can be greatly reduced at the same time, and even meet the discharge and reuse standards, which can significantly reduce the environmental protection and economic pressure of coal mining enterprises in treating mine water.

[0028] Figures and brief description of the figures

[0029] Figure 1 The present invention is the blue solid fluorescent carbon dot salt complex powder (a) prepared in Example 1 under ultraviolet light, the green solid fluorescent carbon dot salt complex powder (b) prepared in Example 3, the yellow solid fluorescent carbon dot salt complex powder (c) prepared in Example 4 and the orange solid fluorescent carbon dot salt complex powder (d) prepared in Example 5;

[0030] Figure 2 The normalized fluorescence spectra of the blue solid fluorescent carbon dot salt complex powder (a) prepared in Example 1 of the present invention, the green solid fluorescent carbon dot salt complex powder (b) prepared in Example 3, the yellow solid fluorescent carbon dot salt complex powder (c) prepared in Example 4, and the orange solid fluorescent carbon dot salt complex powder (d) prepared in Example 5. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0034] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 1mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution, and react for 2min at a stirring speed of 80rpm; then add 0.5mL of polyacrylamide aqueous solution (0.05wt%), react again at a stirring speed of 60rpm for 1min, and let it stand for 30s to take 900mL of supernatant ( 0.1 mg / L) was placed in a 5L beaker; placed in an oven at 160°C for reaction for 4 hours; after natural cooling, 50 mL of sodium hydroxide solution (0.1 wt%) was added, and after the reaction was completed, the mixture was further centrifuged (2000 rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1 hour. The luminescence wavelength of the powder was measured to be 427 nm, the luminescence efficiency was 22%, and the salt and organic matter contents in the mine water were reduced to 1618 mg / L and 67 mg / L, respectively.

[0035] Example 2

[0036] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0037] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 1.3mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution, and react for 2min at a stirring speed of 80rpm; then add 0.8mL of polyacrylamide aqueous solution (0.05wt%), react again for 1min at a stirring speed of 60rpm, and let it stand for 30s to take 900mL of supernatant. The solution (0.1 mg / L) was placed in a 5L beaker; it was placed in an oven at 180°C for reaction for 4 hours; after natural cooling, 50 mL of sodium hydroxide solution (0.1 wt%) was added. After the reaction was completed, it was further centrifuged (2000 rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1 hour. The luminescence wavelength of the powder was measured to be 459 nm, the luminescence efficiency was 30%, and the salt and organic matter contents in the mine water were reduced to 1620 mg / L and 59 mg / L, respectively.

[0038] Example 3

[0039] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0040] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 1.5mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution to it, and react for 2min at a stirring speed of 80rpm; then add 1mL of polyacrylamide aqueous solution (0.05wt%), react again for 1min at a stirring speed of 60rpm, and let it stand for 30s to take 900mL of supernatant (0.1 mg / L) was placed in a 5L beaker; placed in an oven at 200°C for reaction for 6 hours; after natural cooling, 50 mL of sodium hydroxide solution (0.1 wt%) was added, and after the reaction was completed, the mixture was further centrifuged (2000 rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1 hour. The luminescence wavelength of the powder was measured to be 511 nm, the luminescence efficiency was 24%, and the salt and organic matter contents in the mine water were reduced to 1571 mg / L and 73 mg / L, respectively.

[0041] Example 4

[0042] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0043] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 2mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution to it, and react at a stirring speed of 80rpm for 2min; then add 1mL of polyacrylamide aqueous solution (0.05wt%), react again at a stirring speed of 60rpm for 1min, and let it stand for 30s to take 900mL of supernatant (0 .1mg / L) was placed in a 5L beaker; placed in an oven at 220°C for reaction for 10h; after natural cooling, 50mL of sodium hydroxide solution (0.1wt%) was added, and after the reaction was completed, it was further centrifuged (2000rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1h, and the luminescence wavelength of the powder was measured to be 547nm, the luminescence efficiency was 27%, and the salt and organic matter contents in the mine water were reduced to 1589mg / L and 48mg / L, respectively.

[0044] Example 5

[0045] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0046] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 2mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution to it, and react for 2min at a stirring speed of 80rpm; then add 2mL of polyacrylamide aqueous solution (0.05wt%), react again at a stirring speed of 60rpm for 1min, and let it stand for 30s to take 900mL of supernatant (0 .1mg / L) was placed in a 5L beaker; placed in an oven at 240°C for reaction for 12h; after natural cooling, 50mL of sodium hydroxide solution (0.1wt%) was added, and after the reaction was completed, it was further centrifuged (2000rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1h. The luminescence wavelength of the powder was measured to be 589nm, the luminescence efficiency was 32%, and the salt and organic matter contents in the mine water were reduced to 1597mg / L and 68mg / L, respectively.

[0047] Example 6

[0048] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0049] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 2mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution, and react for 2min at a stirring speed of 80rpm; then add 2mL of polyacrylamide aqueous solution (0.05wt%), and react again for 1min at a stirring speed of 60rpm, and let it stand for 30s to take 900mL of supernatant ( 0.1 mg / L) was placed in a 5L beaker; placed in an oven at 240°C for reaction for 12 hours; after natural cooling, 10 mL of potassium hydroxide lye (10 wt%) was added, and after the reaction was completed, the reaction was further centrifuged (2000 rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1 hour. The luminescence wavelength of the powder was measured to be 579 nm, the luminescence efficiency was 38%, and the salt and organic matter contents in the mine water were reduced to 1744 mg / L and 84 mg / L, respectively.

[0050] Example 7

[0051] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0052] Take 1L of mine water with high turbidity (10mg / L), high mineralization (4200mg / L) and high water-soluble organic matter content (978mg / L), add 2mL of polydiallyldimethylammonium chloride (2wt%) aqueous solution, and react for 2min at a stirring speed of 80rpm; then add 2mL of polyacrylamide aqueous solution (0.05wt%), and react again for 1min at a stirring speed of 60rpm, and let it stand for 30s to take 900mL of supernatant ( 0.1 mg / L) was placed in a 5L beaker; placed in an oven at 240°C for reaction for 12 hours; after natural cooling, 20 mL of barium hydroxide lye (10 wt%) was added, and after the reaction was completed, the reaction was further centrifuged (2000 rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1 hour. The luminescence wavelength of the powder was measured to be 583 nm, the luminescence efficiency was 41%, and the salt and organic matter contents in the mine water were reduced to 1244 mg / L and 72 mg / L, respectively.

[0053] Example 8

[0054] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0055] Take 1L of mine water with high turbidity (50mg / L), high mineralization (5208mg / L) and high water-soluble organic matter content (1213mg / L), add 2mL of polydiallyldimethylammonium chloride (7wt%) aqueous solution, and react for 2min at a stirring speed of 80rpm; then add 2mL of polyacrylamide aqueous solution (0.1wt%), react again at a stirring speed of 60rpm for 1min, and let it stand for 30s to take 900mL of supernatant ( 0.1 mg / L) was placed in a 5L beaker; placed in an oven at 240°C for reaction for 12 hours; after natural cooling, 30 mL of barium hydroxide lye (10 wt%) was added, and after the reaction was completed, the mixture was further centrifuged (2000 rpm) for 4 minutes. The obtained precipitate was dried in an oven at 60°C for 1 hour. The luminescence wavelength of the powder was measured to be 586 nm, the luminescence efficiency was 38%, and the salt and organic matter contents in the mine water were reduced to 845 mg / L and 58 mg / L, respectively.

[0056] Example 9

[0057] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0058] Take 1L of mine water with high turbidity (50mg / L), high mineralization (2415mg / L) and high water-soluble organic matter content (774mg / L), add 2mL of polydiallyldimethylammonium chloride (7wt%) aqueous solution thereto, and react at a stirring speed of 80rpm for 2min; then add 2mL of polyacrylamide aqueous solution (0.1wt%), react again at a stirring speed of 60rpm for 1min, and let stand for 30s; take 900mL of supernatant (0.1mg / L) and put it into a 5L beaker; put it in an oven at 240℃ and react for 12h; after natural cooling, add 15mL of barium hydroxide alkali solution (10wt%), and further centrifuge (2000rpm) for 4 minutes after the reaction is completed. The obtained precipitate is dried in an oven at 60℃ for 1h, and the luminescence wavelength of the powder is measured to be 581nm, the luminescence efficiency is 27%, and the salt and organic matter contents in the mine water are reduced to 649mg / L and 31mg / L, respectively.

[0059] Example 10

[0060] This embodiment discloses a method for resource treatment of mine water with high mineralization and high soluble organic matter, comprising the following steps:

[0061] Take 1L of mine water with high turbidity (50mg / L), high mineralization (2415mg / L) and high water-soluble organic matter content (774mg / L), add 4mL of polyaluminium chloride (10wt%) aqueous solution thereto, and react at a stirring speed of 80rpm for 2min; then add 2mL of polyacrylamide aqueous solution (0.1wt%), react again at a stirring speed of 60rpm for 1min, and let stand for 30s; take 900mL of supernatant (0.1mg / L) and put it into a 5L beaker; put it into an oven at 240℃ and react for 12h; after natural cooling, add 15mL of barium hydroxide alkali solution (10wt%), and further centrifuge (2000rpm) for 4 minutes after the reaction is completed. The obtained precipitate is dried in an oven at 60℃ for 1h, and the luminescence wavelength of the powder is measured to be 580nm, the luminescence efficiency is 29%, and the salt and organic matter contents in the mine water are reduced to 653mg / L and 28mg / L, respectively.

[0062] The performance parameters of each embodiment are summarized to obtain Table 1.

[0063] Table 1 Performance comparison of various embodiments

[0064]

[0065]

[0066] The invention belongs to the field of mine water treatment, and relates to a method for resource treatment of mine water with high mineralization and high solubility of organic matter. The method comprises the following steps: adding a certain amount of coagulant and flocculant to mine water containing a large amount of suspended matter, ions and water-soluble organic matter, obtaining clarified mine water after reaction, transferring the clarified mine water to a beaker and placing it in an oven for heating; heating the crude carbon dot solution at 160-240°C for 4-12 hours to obtain the crude carbon dot solution; adding a certain concentration of alkali solution to the crude carbon dot solution after cooling to form a precipitated salt-coated carbon dot turbid solution, and centrifuging the solution; taking the supernatant solution, measuring the ion content and organic matter content thereof, and comparing with the original solution, the content is greatly reduced (the ion content is reduced by about 2500 mg / L, and the organic matter content is reduced by about 1000 mg / L), proving that the method can process the mine water as a resource, and the salt and organic matter content in the mine water is greatly reduced to meet the external discharge standard; taking the precipitate, drying it, and obtaining solid fluorescent carbon dot powder; and adjusting the amount of coagulant and flocculant, the heating temperature and the reaction time to obtain a blue solid fluorescent carbon dot salt complex, a green solid fluorescent carbon dot salt complex and a yellow solid fluorescent carbon dot salt complex, respectively. The method of the present invention treats mine water as a resource for the first time, not only producing multicolor solid fluorescent carbon dots with a luminous efficiency of up to 41%, but also significantly reducing the salt and organic matter content in the mine water to meet the discharge standard.

[0067] Examples 1 to 5 show that by adjusting the concentration and dosage of the coagulant / flocculant, as well as the drying temperature and heating time, fluorescent carbon dot salt complexes of different colors can be obtained, including blue, blue-green, pure green, yellow-green, pure yellow, orange, etc. This shows that by changing the synthesis conditions, the luminescent color of the fluorescent carbon dot salt complex can be precisely controlled. Examples 6 to 10 investigate the effects of different alkali solutions on luminescence and desalination effects. In particular, the luminescence efficiency after treatment with barium hydroxide alkali solution can be as high as 41%, and the desalination effect is also enhanced, which shows that the use of different alkali solutions can significantly improve the performance of the fluorescent carbon dot salt complex.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for resource treatment of high-mineralization and high-organic-matter mine water, characterized in that: The steps include: S1 Removal of suspended solids in the treated mine water: first add a coagulant aid aqueous solution to the treated mine water, stir and react; then add a flocculant aqueous solution, stir and react again; stand and separate to obtain a clarified upper layer mine water aqueous solution A; S2 Preparation of carbon dots in mine water: The obtained mine water aqueous solution A is heated for 4 to 12 hours until the solution becomes a dark brown liquid, and then naturally cooled to room temperature to obtain a mine water crude liquid B containing carbon dots; S3 Coating and separation of carbon dots in mine water: After the reaction is completed, the obtained crude liquid B is placed in a stirring device, and then alkali solution is slowly added until no precipitation is generated, forming a turbid liquid C of carbon dots coated with precipitated salt; The turbid liquid C is centrifuged to obtain the carbon dot complex coated with the salt-containing matrix; S4 Drying of the salt matrix coated carbon dot complex: The carbon dot complex obtained after centrifugation is dried to obtain a multicolor solid fluorescent carbon dot salt complex.

2. A method for resource treatment of high-mineralization and high-organic-matter mine water according to claim 1, characterized in that: In step S1, the coagulant aid is selected from one of polyaluminium chloride and polydiallyldimethylammonium chloride, with a mass concentration of 2 to 10 wt% and a dosage ratio of 1 to 2‰ of the mine water to be treated; the flocculant is selected from polyacrylamide, with a mass concentration of 0.05 wt% and a dosage ratio of 0.5 to 2‰ of the mine water to be treated.

3. A method for resource treatment of high-mineralization and high-organic-matter mine water according to claim 1, characterized in that: In step S1, the mine water to be treated contains water-soluble organic matter and high-mineralization ions, wherein the turbidity range is 10-50 mg / L, the mineralization range is 2415-5208 mg / L and the water-soluble organic matter content range is 774-1213 mg / L, the water-soluble organic matter includes one or more of organic acids and amino sugars, and the high-mineralization ions are selected from Ca 2+ Mg 2+ 、HCO3 - and SO4 2- .

4. A method for resource treatment of high-mineralization and high-organic-matter mine water as claimed in claim 1, characterized in that: In step S2, the heating temperature is 160-300°C, and the heating time is 2-24 hours.

5. A method for resource treatment of high-mineralization and high-organic-matter mine water as claimed in claim 1, characterized in that: In step S1 and step S2, by adjusting the concentration and dosage of the coagulant / flocculant, as well as the drying temperature and heating time, a blue solid-state fluorescent carbon dot salt complex, a blue-green solid-state fluorescent carbon dot salt complex, a pure green solid-state fluorescent carbon dot salt complex, a yellow-green solid-state fluorescent carbon dot salt complex and a pure yellow solid-state fluorescent carbon dot salt complex are obtained respectively; in step S3, solid-state fluorescent carbon dot salt complexes with different luminescence efficiencies and desalination efficiencies are obtained by using different alkali solutions.

6. A method for resource treatment of high-mineralization and high-organic-matter mine water as claimed in claim 5, characterized in that: Key parameters corresponding to the synthesis of blue fluorescent carbon dot salt complexes: In step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the amounts are 1‰ and 0.5‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 160°C and the heating time is 4h; Key parameters corresponding to the synthesis of blue-green fluorescent carbon dot salt complexes: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the dosages are 1.3‰ and 0.8‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 180°C and the heating time is 4h; Key parameters corresponding to the synthesis of pure green fluorescent carbon dot salt complexes: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the dosages are 1.5‰ and 1‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 200℃ and the heating time is 6h; Key parameters corresponding to the synthesis of yellow fluorescent carbon dot salt complexes: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the dosages are 2‰ and 1‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 220°C and the heating time is 10h; The key parameters corresponding to the synthesis of orange fluorescent carbon dot salt complexes are as follows: in step S1, the concentrations of the added coagulant and flocculant are 2wt% and 0.05wt%, respectively, and the amounts are 2‰ and 2‰ of the mine water to be treated, respectively; in step S2, the heating temperature is 240°C and the heating time is 12h.

7. A method for resource treatment of high-mineralization and high-organic-matter mine water as claimed in claim 5, characterized in that: In step S3, the mass fraction of the added alkali solution is 0.1-10%, and the alkali solution is selected from one of lime, sodium hydroxide or barium hydroxide.

8. The method for resource treatment of high-mineralization and high-organic-matter mine water according to claim 1, characterized in that: In step S4, the drying treatment is to dry the carbon dot composite in a vacuum oven at a heating temperature of 40 to 80° C. for a heating time of 1 to 8 hours.

9. Use of the method according to any one of claims 1 to 8 in synthesizing multicolor solid-state fluorescent carbon dot salt complexes.

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