Flotation reagent adding system and method based on supercritical fluid technology

Abstract

The invention relates to the technical field of mineral flotation, provides a flotation reagent adding system and method based on a supercritical fluid technology, and aims to realize efficient dispersion and accurate adding of reagents, reduce the dosage of the reagents and improve the flotation efficiency through high permeability and rapid diffusion characteristics of supercritical fluid. Comprising a supercritical fluid generation unit, a medicament storage unit, a high-pressure mixing unit, an atomization spraying unit and an intelligent control unit. The supercritical fluid generation unit is used for pressurizing and heating carbon dioxide into supercritical fluid; the reagent storage unit is used for storing flotation reagents; the high-pressure mixing unit is used for mixing the supercritical fluid with a flotation reagent to form a homogeneous material; the atomizing and spraying unit sprays the homogeneous-phase material into a flotation tank through a nozzle; the intelligent control unit dynamically adjusts the fluid state and medicament supply according to the ore grade, flow and other parameters.

Description

Technical Field

[0001] This invention relates to the field of mineral flotation technology, and more specifically, to a flotation reagent dosing system and method based on supercritical fluid technology. Background Technology

[0002] Flotation is an important method in mineral separation. Its core technology lies in using flotation reagents to adjust the surface properties of minerals, thereby achieving selective separation between target and non-target minerals. In practical production applications, traditional flotation reagent dosing systems typically add liquid or solid reagents directly to the slurry. However, this direct addition method presents a series of problems.

[0003] These problems mainly manifest as difficulties in achieving uniform dispersion of reagents in the slurry, leading to high reagent dosages and low reaction efficiency. Uneven reagent dispersion directly affects its effect on regulating mineral surface properties, thus limiting the efficiency and stability of the separation process. To achieve the expected separation targets, excessive reagents are often required during operation, which not only increases costs but also fails to fundamentally solve the problem of low reaction efficiency caused by poor dispersion.

[0004] Supercritical fluid technology offers a potential solution to the shortcomings of traditional dosing methods. Taking supercritical carbon dioxide (CO2) as an example, its high diffusivity, low viscosity, and strong dissolving power give it significant advantages in optimizing reagent transport and dispersion. These characteristics can effectively address the problem of uneven reagent dispersion in traditional dosing processes. Although these advantages of supercritical fluids are known, a practical solution that effectively combines supercritical fluid technology with flotation dosing systems has yet to emerge in the current technology. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of existing technologies, this invention provides a flotation reagent dosing system and method based on supercritical fluid technology. The system involves pre-dissolving the flotation reagent in supercritical carbon dioxide fluid to form a homogeneous mixture, which is then injected through a nozzle, utilizing the pressure drop to cause the fluid to expand instantaneously. This instantaneous expansion process atomizes the reagent into nano-sized droplets, significantly improving its dispersion uniformity in the slurry. This solves the technical problems of large reagent dosage and low reaction efficiency caused by uneven dispersion in traditional dosing methods. Furthermore, this invention provides an optimal solution for a flotation reagent dosing method based on supercritical fluid technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A flotation reagent dosing system based on supercritical fluid technology includes:

[0008] A supercritical fluid generation unit is used to pressurize and heat liquid carbon dioxide to a supercritical state to generate supercritical carbon dioxide fluid.

[0009] A reagent storage unit for storing liquid flotation reagents;

[0010] A high-pressure mixing unit is used to mix the supercritical carbon dioxide fluid with the flotation reagent to form a homogeneous mixture;

[0011] The atomizing spray unit is provided with a nozzle for extending into the flotation cell. The atomizing spray unit is used to atomize the homogeneous mixture into nano-sized droplets by means of the instantaneous phase change expansion pressure of the supercritical carbon dioxide and spray them into the flotation cell.

[0012] The intelligent control unit is used to dynamically adjust the temperature and pressure of the supercritical fluid generation unit according to preset ore grade and slurry flow parameters, and control the flow rate of flotation reagents entering the high-pressure mixing unit from the reagent storage unit, so as to control the ratio of flotation reagents to supercritical carbon dioxide in the homogeneous mixture.

[0013] As a further embodiment of the present invention, the fluid inlet of the high-pressure mixing unit is connected to the outlet of the supercritical fluid generating unit, and the inlet of the atomizing injection unit is connected to the outlet of the high-pressure mixing unit.

[0014] As a further embodiment of the present invention, the reagent inlet of the high-pressure mixing unit is connected to the outlet of the reagent storage unit.

[0015] As a further embodiment of the present invention, the intelligent control unit is connected to the supercritical fluid generation unit, the reagent storage unit and the high-pressure mixing unit respectively.

[0016] As a further aspect of the present invention, the supercritical fluid generation unit is used to generate the supercritical carbon dioxide fluid under the following conditions: temperature in the range of 35°C to 50°C, and pressure in the range of 7.5 MPa to 10 MPa.

[0017] As a further embodiment of the present invention, the supercritical fluid generation unit includes a carbon dioxide storage tank, a compression pump connected to the outlet of the carbon dioxide storage tank, and a heating device connected to the outlet of the compression pump.

[0018] As a further embodiment of the present invention, the high-pressure mixing unit is a high-pressure mixer, which is used to mix the supercritical carbon dioxide fluid with the flotation reagent to form the homogeneous mixture.

[0019] As a further aspect of the present invention, the nozzle of the atomizing injection unit is used to atomize and disperse the homogeneous mixture into nano-sized droplets by utilizing the instantaneous expansion of the supercritical carbon dioxide fluid.

[0020] As a further aspect of the present invention, the flotation reagent stored in the reagent storage unit is one or both of a collector and a frother.

[0021] As a further aspect of the present invention, a flotation reagent dosing method based on supercritical fluid technology includes the following steps:

[0022] Step 1: The intelligent control unit controls the supercritical fluid generation unit to adjust the temperature and pressure in real time based on the real-time monitored ore grade and slurry flow parameters, so as to process carbon dioxide to a supercritical state to obtain supercritical carbon dioxide fluid.

[0023] Step 2: The supply flow rate of the flotation reagent is controlled by the intelligent control unit, and the supercritical carbon dioxide fluid and the flotation reagent taken from the reagent storage unit are simultaneously transported to the high-pressure mixing unit to form a homogeneous mixture;

[0024] Step 3: The homogeneous mixture is sprayed into the flotation cell through the atomizing spray unit, so that the supercritical carbon dioxide is rapidly vaporized, and the flotation reagent is uniformly dispersed in the slurry in the form of nano-sized droplets.

[0025] Compared with the prior art, the beneficial effects of the flotation reagent dosing system and method based on supercritical fluid technology of the present invention are as follows:

[0026] This invention atomizes flotation reagents into micro- and nano-sized particles by pre-dissolving the flotation reagents in supercritical carbon dioxide fluid and then utilizing the pressure drop at the nozzle outlet to cause instantaneous expansion of the fluid. This technique achieves highly uniform dispersion of the reagents in the slurry, increasing the effective contact area between the reagents and mineral particles. In contrast, existing techniques that directly add liquid or solid reagents to the slurry are limited by the macroscopic effects of mechanical stirring, resulting in poor reagent dispersion and easily leading to uneven local concentrations, thus affecting the flotation effect.

[0027] This invention enables the reagents to interact more fully with mineral particles, thereby reducing the unit consumption of flotation reagents by more than 30% while achieving the same or even better flotation effect. Existing technologies, due to low dispersion efficiency, require excessive addition of reagents to compensate for insufficient utilization, resulting in significant waste and increased costs. Furthermore, the supercritical carbon dioxide used in this invention as the dispersion medium can be recovered and recycled. Compared to the subsequent environmental treatment pressure caused by excessive reagents in existing technologies, this invention has significant energy-saving and environmental advantages.

[0028] Compared with existing technologies, this invention provides an optimal solution: In step one, the temperature is 40℃ and the pressure is 9MPa. In step two, the dosage of flotation reagents is: collector 300g / t, frother 100g / t, increasing the clean coal yield by 15.03%. This technical solution is disclosed for the first time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a flotation reagent dosing system based on supercritical fluid technology according to the present invention. Detailed Implementation

[0030] The technical solutions of this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] Example 1

[0032] A flotation reagent dosing system based on supercritical fluid technology includes:

[0033] A supercritical fluid generation unit is used to pressurize and heat liquid carbon dioxide to a supercritical state to generate supercritical carbon dioxide fluid.

[0034] A reagent storage unit for storing liquid flotation reagents;

[0035] A high-pressure mixing unit, wherein the fluid inlet of the high-pressure mixing unit is connected to the outlet of the supercritical fluid generation unit, and the reagent inlet of the high-pressure mixing unit is connected to the outlet of the reagent storage unit, and the high-pressure mixing unit is used to mix the supercritical carbon dioxide fluid with the flotation reagent to form a homogeneous mixture;

[0036] The atomizing spray unit has an inlet connected to the outlet of the high-pressure mixing unit. The atomizing spray unit is equipped with a nozzle for extending into the flotation cell. The atomizing spray unit is used to atomize the homogeneous mixture into nano-sized droplets by means of the instantaneous phase change expansion pressure of the supercritical carbon dioxide and spray them into the flotation cell.

[0037] The intelligent control unit is connected to the supercritical fluid generation unit, the reagent storage unit, and the high-pressure mixing unit. The intelligent control unit is used to dynamically adjust the temperature and pressure of the supercritical fluid generation unit according to preset ore grade and slurry flow parameters, and control the flow rate of flotation reagent entering the high-pressure mixing unit from the reagent storage unit, so as to accurately control the ratio of flotation reagent to supercritical carbon dioxide in the homogeneous mixture.

[0038] Example 2

[0039] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0040] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 35°C and pressure 8MPa.

[0041] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0042] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0043] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0044] Example 3

[0045] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0046] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 35°C and pressure 9 MPa.

[0047] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0048] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0049] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0050] Example 4

[0051] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0052] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 7.5 MPa.

[0053] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0054] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0055] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0056] Example 5

[0057] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0058] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 8MPa.

[0059] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0060] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0061] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0062] Example 6

[0063] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0064] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 9 MPa.

[0065] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0066] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0067] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0068] Example 7

[0069] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0070] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 45℃ and pressure 7.5MPa.

[0071] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0072] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0073] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0074] Example 8

[0075] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0076] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 45°C and pressure 8MPa.

[0077] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0078] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0079] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0080] Example 9

[0081] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0082] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 45°C and pressure 9 MPa.

[0083] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0084] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0085] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0086] Example 10

[0087] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0088] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 9 MPa.

[0089] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 270 g / t of collector and 90 g / t of frother.

[0090] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0091] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0092] Example 11

[0093] A flotation reagent dosing method based on supercritical fluid technology includes the following steps:

[0094] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 9 MPa.

[0095] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 240 g / t of collector and 80 g / t of frother.

[0096] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0097] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0098] Example 12

[0099] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0100] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 9 MPa.

[0101] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 210 g / t of collector and 70 g / t of frother.

[0102] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0103] Step four: Perform performance tests on the flotation coal samples obtained after the flotation process is completed.

[0104] Example 13

[0105] This embodiment provides a comparative example, which is a method for adding flotation reagents, including the following steps:

[0106] Step 1: The operator adds the flotation coal slurry into the flotation machine and turns on the agitator of the flotation machine.

[0107] Step two: After stirring for 3 minutes, the operator adds a collector to the flotation machine at a dosage of 300g / t.

[0108] Step 3: After adding the collector and continuing to stir for 2 minutes, the operator adds a frother to the flotation machine at a dosage of 100g / t.

[0109] Step four: After 10 seconds, the operator opens the air inlet valve of the flotation machine to start the flotation process and finally obtains a flotation coal sample for testing.

[0110] Example 14

[0111] During implementation, two other preferred technical solutions are available.

[0112] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0113] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 35°C and pressure 7.5 MPa.

[0114] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: 300 g / t of collector and 100 g / t of frother.

[0115] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0116] A dosing method for a flotation reagent dosing system based on supercritical fluid technology includes the following steps:

[0117] Step 1: The supercritical fluid generation unit pressurizes and heats carbon dioxide to a supercritical state, with the process parameters set as follows: temperature 40°C and pressure 9 MPa.

[0118] Step 2: Supercritical carbon dioxide fluid is transported to the high-pressure mixing unit and forms a homogeneous mixture with flotation reagents in the unit, wherein the amount of flotation reagents used is: collector 100g / t and frother 33.33g / t.

[0119] Step 3: The homogeneous mixture is sprayed into the flotation cell containing pre-added flotation coal slurry via the atomizing spray unit. The supercritical carbon dioxide is rapidly gasified, and the reagent is uniformly dispersed in the form of microdroplets, thus initiating flotation.

[0120] The flotation coal samples obtained in Examples 2-12 and 13 were tested, and the results are shown in Table 1:

[0121] Table 1: Effects of different supercritical CO2 on flotation results

[0122]

[0123] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0124] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flotation reagent dosing system based on supercritical fluid technology, characterized in that, include: A supercritical fluid generation unit is used to pressurize and heat liquid carbon dioxide to a supercritical state to generate supercritical carbon dioxide fluid. A reagent storage unit for storing liquid flotation reagents; A high-pressure mixing unit is used to mix the supercritical carbon dioxide fluid with the flotation reagent to form a homogeneous mixture; The atomizing spray unit is provided with a nozzle for extending into the flotation cell. The atomizing spray unit is used to atomize the homogeneous mixture into nano-sized droplets by means of the instantaneous phase change expansion pressure of the supercritical carbon dioxide and spray them into the flotation cell. The intelligent control unit is used to dynamically adjust the temperature and pressure of the supercritical fluid generation unit according to preset ore grade and slurry flow parameters, and control the flow rate of flotation reagents entering the high-pressure mixing unit from the reagent storage unit, so as to control the ratio of flotation reagents to supercritical carbon dioxide in the homogeneous mixture.

2. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The fluid inlet of the high-pressure mixing unit is connected to the outlet of the supercritical fluid generating unit, and the inlet of the atomizing injection unit is connected to the outlet of the high-pressure mixing unit.

3. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The reagent inlet of the high-pressure mixing unit is connected to the outlet of the reagent storage unit; the high-pressure mixing unit is a high-pressure mixer, which is used to mix the supercritical carbon dioxide fluid with the flotation reagent to form the homogeneous mixture.

4. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The intelligent control unit is connected to the supercritical fluid generation unit, the reagent storage unit, and the high-pressure mixing unit, respectively.

5. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The supercritical fluid generation unit generates supercritical carbon dioxide fluid under the following conditions: temperature in the range of 35°C to 50°C, and pressure in the range of 7.5 MPa to 10 MPa.

6. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The supercritical fluid generation unit includes a carbon dioxide storage tank, a compression pump connected to the outlet of the carbon dioxide storage tank, and a heating device connected to the outlet of the compression pump.

7. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The nozzle of the atomizing injection unit is used to atomize and disperse the homogeneous mixture into nano-sized droplets by utilizing the instantaneous expansion of the supercritical carbon dioxide fluid.

8. The flotation reagent dosing system based on supercritical fluid technology according to claim 1, characterized in that, The flotation reagents stored in the reagent storage unit are one or both of the collectors and frothers.

9. A dosing method for a flotation reagent dosing system based on supercritical fluid technology according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: The intelligent control unit controls the supercritical fluid generation unit to adjust the temperature and pressure in real time based on the real-time monitored ore grade and slurry flow parameters, so as to process carbon dioxide to a supercritical state to obtain supercritical carbon dioxide fluid. Step 2: The supply flow rate of the flotation reagent is controlled by the intelligent control unit, and the supercritical carbon dioxide fluid and the flotation reagent taken from the reagent storage unit are simultaneously transported to the high-pressure mixing unit to form a homogeneous mixture; Step 3: The homogeneous mixture is sprayed into the flotation cell through the atomizing spray unit, so that the supercritical carbon dioxide is rapidly vaporized, and the flotation reagent is uniformly dispersed in the slurry in the form of nano-sized droplets.

10. The dosing method of the flotation reagent dosing system based on supercritical fluid technology according to claim 9, characterized in that, Step 1: Temperature 40℃, Pressure 9MPa; Step 2: The dosage of flotation reagents is: collector 300g / t, frother 100g / t.

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