High-efficiency energy-saving and environment-friendly flotation reagent

Abstract

The present application relates to a kind of high efficiency energy-saving environmental protection's floatation reagent, it relates to mineral floatation technical field, including the following by weight parts of each raw material composition: bio-based fatty acid methyl ester 30-40 parts, synergist 8-12 parts, functional additive 0.5-1.5 parts, Span 80 3-5 parts, sodium carboxymethyl cellulose 1-3 parts, organic nanocrystal 0.5-3 parts, manganese naphthenate 0.3-0.5 parts, hydroxypropyl beta-cyclodextrin 0.1-1.5 parts, adenosine 0.1-0.5 parts, water 10-20 parts.The high efficiency energy-saving environmental protection's floatation reagent has high selectivity and stability, low pollution and frothing and capture performance synergistic optimization.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral flotation, and in particular to a flotation agent that is efficient, energy-saving and environmentally friendly. Background Art

[0002] In the field of mineral flotation, to effectively separate useful minerals from gangue minerals, or to separate different types of useful minerals, it is often necessary to add certain reagents to modify the physical and chemical properties of the mineral surface and the properties of the medium. These reagents are collectively referred to as flotation reagents. The performance of flotation reagents directly affects mineral processing efficiency and resource utilization. With the increasing depletion of high-grade ores, the flotation of low-grade, complex, and difficult-to-separate ores has become an industry focus, and the limitations of traditional flotation reagents have become increasingly prominent.

[0003] Traditional flotation reagents primarily include collectors, frothers, inhibitors, and pH adjusters. These agents often have a strong pungent odor and contain toxic and hazardous substances such as benzene and sulfides, posing a health hazard to operators and polluting the environment. Furthermore, traditional flotation reagents suffer from low flotation efficiency, high dosage, and insufficient selectivity. Commercially available flotation reagents also suffer from various technical deficiencies, including poor flotation performance, poor selectivity, high energy consumption, and a need for further improvement in stability and environmental performance.

[0004] To address the above problems, a Chinese invention patent with authorization publication number CN103599851B discloses a novel, highly efficient, energy-saving, and environmentally friendly flotation agent. It is composed of the following substances in parts by weight: 30-70 parts diesel, 10-50 parts sec-octanol, 25-45 parts heptanol, and 15-35 parts 2-ethylhexanol. The invention's flotation agent is non-toxic, odorless, energy-efficient, highly safe, and has excellent foaming and collection properties. The dosage is 0.1-0.5 kg / ton of coal slime, a low dosage that saves coal preparation costs and increases clean coal yield. However, it uses petroleum-based diesel as one of its main ingredients, has a low biodegradability, and long-term use can lead to accumulation in soil and water, causing persistent pollution to the ecological environment. Furthermore, its flotation efficiency and effectiveness, selectivity, and stability still need to be further improved.

[0005] Organic nanocrystals, a new type of nanomaterial, boast excellent biocompatibility, high surface activity, and strong controllability. They have demonstrated excellent performance in fields such as biomedicine and composite materials. However, their application as flotation agents remains largely unexplored, with no patents or literature demonstrating their effectiveness in enhancing flotation selectivity or improving stability.

[0006] In view of this, the present invention provides a high-efficiency, energy-saving and environmentally friendly flotation agent containing organic nanocrystals. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a flotation agent that is efficient, energy-saving and environmentally friendly, with high selectivity and stability, low pollution, and synergistic optimization of foaming and collecting performance.

[0008] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a high-efficiency, energy-saving and environmentally friendly flotation reagent, comprising the following raw materials, calculated by weight: 30-40 parts of bio-based fatty acid methyl ester, 8-12 parts of synergist, 0.5-1.5 parts of functional additive, 3-5 parts of Span 80, 1-3 parts of sodium carboxymethyl cellulose, 0.5-3 parts of organic nanocrystals, 0.3-0.5 parts of manganese naphthenate, 0.1-1.5 parts of hydroxypropyl β-cyclodextrin, 0.1-0.5 parts of adenosine, and 10-20 parts of water.

[0009] Preferably, the bio-based fatty acid methyl ester is a mixture of methyl palmitate, methyl stearate, and methyl oleate in a mass ratio of (1-3):(0.8-1.2):1.

[0010] Preferably, the synergist is a mixture of pine alcohol oil, ether alcohol oil and palmitoleic acid in a mass ratio of (3-5):(1-3):1.

[0011] Preferably, the functional additive is a mixture of polyepoxysuccinic acid and a coupling agent in a mass ratio of (2-4):1.

[0012] Preferably, the relative molecular mass of the polyepoxysuccinic acid is 400-1500, and it is provided by Shandong Taihe Science and Technology Co., Ltd.

[0013] Preferably, the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0014] Preferably, the weight average molecular weight of the sodium carboxymethyl cellulose is 250,000 and the degree of substitution is 0.9.

[0015] Preferably, the organic nanocrystals are cellulose nanocrystals.

[0016] Preferably, the cellulose nanocrystals have a diameter of 10-50 nm and a length of 200-500 nm.

[0017] Preferably, the hydroxypropyl β-cyclodextrin is provided by Shandong Runxinda Chemical Co., Ltd.

[0018] Another object of the present invention is to provide a method for preparing the highly efficient, energy-saving and environmentally friendly flotation agent, comprising the following steps: weighing the raw materials by weight, mixing them, ultrasonically treating them at 30-40°C for 10-15 minutes, stirring them at a speed of 200-300 r / min for 15-20 minutes; and finally, keeping them warm and stirring them at 40-50°C for 20-30 minutes to obtain the highly efficient, energy-saving and environmentally friendly flotation agent.

[0019] Preferably, the ultrasonic power of the ultrasonic treatment is 300-500W.

[0020] Due to the application of the above technical solution, the present invention has the following beneficial effects:

[0021] (1) The method for preparing a high-efficiency, energy-saving and environmentally friendly flotation agent disclosed in the present invention has a simple process, convenient operation and control, high efficiency and finished product qualification rate, low dependence on equipment, is suitable for continuous large-scale production, and has high promotion and application value.

[0022] (2) The high-efficiency, energy-saving and environmentally friendly flotation agent disclosed in the present invention comprises the following raw materials in parts by weight: 30-40 parts of bio-based fatty acid methyl ester, 8-12 parts of synergist, 0.5-1.5 parts of functional additive, 3-5 parts of Span 80, 1-3 parts of sodium carboxymethyl cellulose, 0.5-3 parts of organic nanocrystals, 0.3-0.5 parts of manganese cyclohexaneate, 0.1-1.5 parts of hydroxypropyl β-cyclodextrin, 0.1-0.5 parts of adenosine, and 10-20 parts of water. Through the mutual coordination and joint action of the raw materials, the prepared agent has high selectivity and stability, low pollution, good flotation efficiency and effect, and requires a small amount of water.

[0023] (3) The high-efficiency, energy-saving and environmentally friendly flotation agent disclosed in the present invention constructs a three-dimensional action system of "targeted adsorption-foam regulation-environmental adaptation" through the synergistic effect of multiple components, breaking through the single function limitation of traditional agents. Bio-based fatty acid methyl ester is used as the core collector. Its long-chain alkyl and ester groups can accurately bind to target minerals such as copper and coal through coordination bonds. The non-ionic surfactant structure of Span 80 can reduce the solid-liquid interfacial tension, which significantly improves the adsorption efficiency of the collector on the mineral surface; the enhancer forms an activation coupling effect with manganese cyclopentaneate, and the manganese ions of manganese cyclopentaneate can break the oxide layer on the mineral surface; the enhancer is composed of pine oil, ether alcohol oil, and palmitic acid in a ratio of (3-5): (1-3): 1, and pine oil provides basic foaming properties. Ether alcohol oil enhances foam stability, palmitic acid and bio-based fatty acid methyl ester synergistically strengthen the capture ability, thereby improving the capture-foaming balance coefficient of the agent; bio-based fatty acid methyl ester adopts methyl palmitate, methyl stearate, and methyl oleate mixed in a mass ratio of (1-3):(0.8-1.2):1, and the three ingredients complement each other: the saturated long-chain structure of methyl palmitate and methyl stearate enhances the adsorption stability on hydrophobic minerals, and the unsaturated double bond of methyl oleate enhances the adaptability to complex mineral surfaces.

[0024] (4) The present invention discloses a highly efficient, energy-saving and environmentally friendly flotation agent. The functional additive is polyepoxysuccinic acid (molecular weight 400-1500) mixed with a silane coupling agent in a ratio of (2-4):1, forming a "double-effect selective regulation" mechanism. The carboxyl group of polyepoxysuccinic acid can chelate with metal ions on the surface of gangue minerals, hindering their binding with the collector; the alkoxy group of the silane coupling agent reacts with the hydroxyl group on the surface of the target mineral to enhance the targeted adsorption of the collector; the cavity structure of cyclodextrin preferentially includes the hydrophilic groups on the surface of the gangue, and the hydroxyl group of cellulose nanocrystals forms a hydrogen bond network with the ester group of bio-based fatty acid methyl ester, constructing a "molecular recognition barrier" on the mineral surface, thereby improving the flotation effect and efficiency. Sodium carboxymethyl cellulose forms a more stable three-dimensional network structure in a low-temperature environment, improving foam stability. In high-salt ore pulp, the purine ring structure of adenosine and the carboxyl group of polyepoxysuccinic acid synergistically resist salt ion interference through charge neutralization, significantly improving the stability of the agent and broadening its application range in high-salt mining areas.

[0025] (5) The high-efficiency, energy-saving and environmentally friendly flotation agent disclosed in the present invention, hydroxypropyl β-cyclodextrin, has a unique cyclic hollow structure, which is hydrophobic inside and hydrophilic outside. It can form inclusion complexes with components such as bio-based fatty acid methyl ester in the agent, increase the solubility and dispersibility of these components in water, make the agent act more evenly on the mineral surface, and improve the flotation efficiency; through inclusion complexes and intermolecular forces, hydroxypropyl β-cyclodextrin can combine the various components in the agent more tightly together, prevent the agent from stratification during storage and use, and improve the storage stability and ease of use of the agent; the hydrophilic group of hydroxypropyl β-cyclodextrin can better combine with water, and its cyclic structure can interact with components such as cellulose nanocrystals and manganese epoxide, further optimizing the three-dimensional adsorption structure of "agent-nanocrystal-mineral", enhancing the capture effect, and improving the concentrate grade and recovery rate. Adenosine molecules contain purine rings and ribose groups, and have certain polarity and aromatic properties. They can interact with mineral surfaces and other reagent components through hydrogen bonds, π-π stacking, etc., accelerating the adsorption rate of the reagent on the mineral surface, shortening the flotation reaction time, and improving flotation efficiency; the polar groups of adenosine can enhance the reagent's ability to resist salt interference in high-salt ore pulp, maintain the dispersion state and activity of the reagent molecules, and enable the reagent to maintain good flotation performance in complex ore pulp environments; adenosine is a naturally occurring biomolecule with good biocompatibility. Its addition can improve the overall bioaffinity of the reagent and reduce the reagent's potential toxicity to the ecological environment. The surface of cellulose nanocrystals is rich in hydroxyl groups, which can form hydrogen bonds with the ester groups of bio-based fatty acid methyl esters. At the same time, they are adsorbed on the mineral surface through van der Waals forces, constructing a three-dimensional adsorption structure of "agent-nanocrystal-mineral", enhancing the binding strength between the collector and the mineral, and improving the recovery rate; the nanosize effect of organic nanocrystals can reduce the viscosity of the agent at low temperatures, and its surface hydrophilic and hydrophobic structure can promote the uniform dispersion of the agent in the ore slurry, solving the low-temperature agglomeration problem of traditional agents and further reducing the decline in low-temperature recovery rate; the steric hindrance effect of organic nanocrystals can hinder the binding of gangue minerals and collectors, and synergistically with pine oil to enhance the recognition ability of target minerals, significantly improving the grade of the concentrate. DETAILED DESCRIPTION

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0027] Example 1

[0028] A high-efficiency, energy-saving and environmentally friendly flotation reagent comprises the following raw materials, measured in parts by weight: 30 parts of bio-based fatty acid methyl ester, 8 parts of a synergist, 0.5 parts of a functional additive, 3 parts of Span 80, 1 part of sodium carboxymethyl cellulose, 0.5 parts of organic nanocrystals, 0.3 parts of manganese naphthenate, 0.1 parts of hydroxypropyl β-cyclodextrin, 0.1 parts of adenosine, and 10 parts of water.

[0029] The bio-based fatty acid methyl ester is a mixture of methyl palmitate, methyl stearate and methyl oleate in a mass ratio of 1:0.8:1; the synergist is a mixture of pine alcohol oil, ether alcohol oil and palmitoleic acid in a mass ratio of 3:1:1; the functional additive is a mixture of polyepoxysuccinic acid and coupling agent in a mass ratio of 2:1; the relative molecular mass of the polyepoxysuccinic acid is 400-1500, which is provided by Shandong Taihe Science and Technology Co., Ltd.; the coupling agent is silane coupling agent KH550; the weight average molecular weight of the sodium carboxymethyl cellulose is 250000, and the degree of substitution is 0.9; the organic nanocrystal is cellulose nanocrystal; the diameter of the cellulose nanocrystal is 10-50 nm, and the length is 200-500 nm; the hydroxypropyl beta-cyclodextrin is provided by Shandong Runxinda Chemical Co., Ltd.

[0030] A preparation method of the high-efficiency energy-saving and environment-friendly flotation reagent, comprising the following steps: weighing each raw material by weight parts, mixing, then ultrasonic treatment at 30℃ for 10 minutes, stirring at a speed of 200r / min for 15 minutes; finally, stirring at 40℃ for 20 minutes, to obtain the high-efficiency energy-saving and environment-friendly flotation reagent; the ultrasonic power of the ultrasonic treatment is 300W.

[0031] Example 2

[0032] A high-efficiency energy-saving and environment-friendly flotation reagent, comprising the following raw materials in parts by weight: bio-based fatty acid methyl ester 33 parts, synergist 9 parts, functional additive 0.9 parts, Span 80 3.5 parts, sodium carboxymethyl cellulose 1.5 parts, organic nanocrystal 1.5 parts, manganese naphthenate 0.35 parts, hydroxypropyl beta-cyclodextrin 0.7 parts, adenosine 0.2 parts, and water 13 parts.

[0033] The bio-based fatty acid methyl ester is a mixture of methyl palmitate, methyl stearate and methyl oleate in a mass ratio of 1.5:0.9:1; the synergist is a mixture of pine alcohol oil, ether alcohol oil and palmitoleic acid in a mass ratio of 3.5:1.5:1; the functional additive is a mixture of polyepoxysuccinic acid and coupling agent in a mass ratio of 2.5:1; the relative molecular mass of the polyepoxysuccinic acid is 400-1500, which is provided by Shandong Taihe Science and Technology Co., Ltd.; the coupling agent is silane coupling agent KH560; the weight average molecular weight of the sodium carboxymethyl cellulose is 250000, and the degree of substitution is 0.9; the organic nanocrystal is cellulose nanocrystal; the diameter of the cellulose nanocrystal is 10-50 nm, and the length is 200-500 nm; the hydroxypropyl beta-cyclodextrin is provided by Shandong Runxinda Chemical Co., Ltd.

[0034] A method for preparing the highly efficient, energy-saving, and environmentally friendly flotation agent comprises the following steps: weighing raw materials by weight, mixing, ultrasonically treating at 32° C. for 12 minutes, stirring at 220 r / min for 17 minutes; and finally, keeping the mixture warm and stirring at 43° C. for 23 minutes to obtain the highly efficient, energy-saving, and environmentally friendly flotation agent; the ultrasonic power of the ultrasonic treatment is 350 W.

[0035] Example 3

[0036] A high-efficiency, energy-saving and environmentally friendly flotation reagent comprises the following raw materials, measured in parts by weight: 35 parts of bio-based fatty acid methyl ester, 10 parts of a synergist, 1 part of a functional additive, 4 parts of Span 80, 2 parts of sodium carboxymethyl cellulose, 2 parts of organic nanocrystals, 0.4 parts of manganese naphthenate, 1 part of hydroxypropyl β-cyclodextrin, 0.35 parts of adenosine, and 15 parts of water.

[0037] The bio-based fatty acid methyl ester is a mixture of methyl palmitate, methyl stearate, and methyl oleate in a mass ratio of 2:1:1; the synergist is a mixture of pine oil, ether alcohol oil, and palmitoleic acid in a mass ratio of 4:2:1; the functional additive is a mixture of polyepoxysuccinic acid and a coupling agent in a mass ratio of 3:1; the relative molecular mass of the polyepoxysuccinic acid is 400-1500, and it is provided by Shandong Taihe Science and Technology Co., Ltd.; the coupling agent is a silane coupling agent KH570; the weight average molecular weight of the sodium carboxymethyl cellulose is 250,000, and the degree of substitution is 0.9; the organic nanocrystals are cellulose nanocrystals; the diameter of the cellulose nanocrystals is 10-50 nm, and the length is 200-500 nm; the hydroxypropyl β-cyclodextrin is provided by Shandong Runxinda Chemical Co., Ltd.

[0038] A method for preparing the highly efficient, energy-saving, and environmentally friendly flotation agent comprises the following steps: weighing the raw materials by weight, mixing them, ultrasonically treating them at 35°C for 13 minutes, stirring them at a speed of 250 r / min for 18 minutes; and finally, keeping the mixture warm and stirring at 45°C for 25 minutes to obtain the highly efficient, energy-saving, and environmentally friendly flotation agent; the ultrasonic power of the ultrasonic treatment is 400W.

[0039] Example 4

[0040] A high-efficiency, energy-saving, and environmentally friendly flotation reagent comprises the following raw materials, measured in parts by weight: 38 parts of bio-based fatty acid methyl ester, 11 parts of a synergist, 1.3 parts of a functional additive, 4.5 parts of Span 80, 2.5 parts of sodium carboxymethyl cellulose, 2.5 parts of organic nanocrystals, 0.45 parts of manganese naphthenate, 1.3 parts of hydroxypropyl β-cyclodextrin, 0.4 parts of adenosine, and 18 parts of water.

[0041] The bio-based fatty acid methyl ester is a mixture of methyl palmitate, methyl stearate, and methyl oleate in a mass ratio of 2.5:1.1:1; the synergist is a mixture of pine oil, ether alcohol oil, and palmitoleic acid in a mass ratio of 4.5:2.5:1; the functional additive is a mixture of polyepoxysuccinic acid and a coupling agent in a mass ratio of 3.5:1; the relative molecular mass of the polyepoxysuccinic acid is 400-1500, and it is provided by Shandong Taihe Science and Technology Co., Ltd.; The coupling agent is a mixture of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570 in a mass ratio of 1:2:1; the weight-average molecular weight of the sodium carboxymethyl cellulose is 250,000, and the degree of substitution is 0.9; the organic nanocrystals are cellulose nanocrystals; the diameter of the cellulose nanocrystals is 10-50 nm, and the length is 200-500 nm; the hydroxypropyl β-cyclodextrin is provided by Shandong Runxinda Chemical Co., Ltd.

[0042] A method for preparing the highly efficient, energy-saving, and environmentally friendly flotation agent comprises the following steps: weighing raw materials by weight, mixing, ultrasonically treating at 38° C. for 14 minutes, stirring at a speed of 290 r / min for 19 minutes; and finally, keeping the mixture warm and stirring at 48° C. for 28 minutes to obtain the highly efficient, energy-saving, and environmentally friendly flotation agent; the ultrasonic power of the ultrasonic treatment is 450 W.

[0043] Example 5

[0044] A high-efficiency, energy-saving and environmentally friendly flotation reagent comprises the following raw materials, measured in parts by weight: 40 parts of bio-based fatty acid methyl ester, 12 parts of a synergist, 1.5 parts of a functional additive, 5 parts of Span 80, 3 parts of sodium carboxymethyl cellulose, 3 parts of organic nanocrystals, 0.5 parts of manganese naphthenate, 1.5 parts of hydroxypropyl β-cyclodextrin, 0.5 parts of adenosine, and 20 parts of water.

[0045] The bio-based fatty acid methyl ester is a mixture of methyl palmitate, methyl stearate, and methyl oleate in a mass ratio of 3:1.2:1; the enhancer is a mixture of pine oil, ether alcohol oil, and palmitoleic acid in a mass ratio of 5:3:1; the functional additive is a mixture of polyepoxysuccinic acid and a coupling agent in a mass ratio of 4:1; the relative molecular mass of the polyepoxysuccinic acid is 400-1500, and it is provided by Shandong Taihe Science and Technology Co., Ltd.; the coupling agent is a silane coupling agent KH550; the weight average molecular weight of the sodium carboxymethyl cellulose is 250,000, and the degree of substitution is 0.9; the organic nanocrystals are cellulose nanocrystals; the diameter of the cellulose nanocrystals is 10-50 nm, and the length is 200-500 nm; the hydroxypropyl β-cyclodextrin is provided by Shandong Runxinda Chemical Co., Ltd.

[0046] A method for preparing the highly efficient, energy-saving and environmentally friendly flotation agent comprises the following steps: weighing the raw materials by weight, mixing them, ultrasonically treating them at 40°C for 15 minutes, stirring them at a speed of 300 r / min for 20 minutes; and finally, keeping the mixture warm and stirring at 50°C for 30 minutes to obtain the highly efficient, energy-saving and environmentally friendly flotation agent; the ultrasonic power of the ultrasonic treatment is 500W.

[0047] Comparative Example 1

[0048] This example provides a highly efficient, energy-saving, and environmentally friendly flotation agent, which is basically the same as Example 1, except that no organic nanocrystals are added.

[0049] Comparative Example 2

[0050] This example provides a highly efficient, energy-saving, and environmentally friendly flotation reagent, which is basically the same as Example 1, except that hydroxypropyl β-cyclodextrin and adenosine are not added.

[0051] To verify the performance of the flotation reagent of the present invention, an experiment was conducted using coal flotation as an example. The experiment used a laboratory flotation machine, placed a certain amount of coal slime sample in the flotation tank, added an appropriate amount of water, and prepared a coal slurry with a mass concentration of 10%. The flotation reagent of each example of the present invention was added to the coal slurry at a dosage of 0.1 kg / ton of coal slime. The flotation operation was carried out in accordance with the national standard GB / T 4757-2013 "Test Method for Laboratory Unit Flotation of Coal Powder (Sludge)". During the flotation process, the aeration volume was controlled to 0.17 m 3 / h, agitator speed of 1800 rpm, and flotation time of 5 minutes. After flotation, the clean coal and tail coal products were collected separately, and the clean coal ash content and yield were determined according to the national standard GB / T 212-2008, "Methods for Industrial Analysis of Coal." The test results are shown in Table 1. COD in the flotation wastewater was determined with reference to HJ / T 399-2007, "Water Quality - Determination of Chemical Oxygen Demand - Rapid Digestion Spectrophotometric Method." The reagent was stored at 25°C and 60% relative humidity for 7 days and observed for stratification. If no stratification occurs, the stability is considered acceptable; otherwise, it fails.

[0052] As can be seen from Table 1, the high-efficiency, energy-saving and environmentally friendly flotation agents disclosed in various embodiments of the present invention have better flotation effects, better environmental protection and greater stability than those of the comparative examples. The combined use of organic nanocrystals, hydroxypropyl β-cyclodextrin and adenosine is beneficial to improving the above-mentioned properties.

[0053] Table 1

[0054]

[0055] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A high-efficiency, energy-saving and environmentally friendly flotation reagent, characterized in that: The invention comprises the following raw materials in parts by weight: 30-40 parts of bio-based fatty acid methyl ester, 8-12 parts of synergist, 0.5-1.5 parts of functional additive, 3-5 parts of Span 80, 1-3 parts of sodium carboxymethyl cellulose, 0.5-3 parts of organic nanocrystals, 0.3-0.5 parts of manganese naphthenate, 0.1-1.5 parts of hydroxypropyl β-cyclodextrin, 0.1-0.5 parts of adenosine, and 10-20 parts of water; the organic nanocrystals are cellulose nanocrystals; the cellulose nanocrystals have a diameter of 10-50 nm and a length of 200-500 nm; The synergist is a mixture of pine oil, ether alcohol oil, and palmitic acid in a mass ratio of (3-5): (1-3): 1; The functional additive is prepared by mixing polyepoxysuccinic acid and a coupling agent in a mass ratio of (2-4):

1.

2. The high-efficiency, energy-saving and environmentally friendly flotation reagent according to claim 1, characterized in that: The bio-based fatty acid methyl ester is prepared by mixing methyl palmitate, methyl stearate and methyl oleate in a mass ratio of (1-3):(0.8-1.2):

1.

3. The high-efficiency, energy-saving and environmentally friendly flotation reagent according to claim 1, characterized in that: The relative molecular weight of the polyepoxysuccinic acid is 400-1500; the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

4. The high-efficiency, energy-saving and environmentally friendly flotation reagent according to claim 1, characterized in that: The weight average molecular weight of the sodium carboxymethyl cellulose is 250,000, and the degree of substitution is 0.

9.

5. A method for preparing a high-efficiency, energy-saving and environmentally friendly flotation agent according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: weighing raw materials by weight, mixing, ultrasonically treating the mixture at 30-40 DEG C for 10-15 minutes, stirring the mixture at a speed of 200-300 r / min for 15-20 minutes, and finally stirring the mixture at 40-50 DEG C for 20-30 minutes to obtain a high-efficiency, energy-saving and environmentally friendly flotation agent.

6. The method for preparing a high-efficiency, energy-saving and environmentally friendly flotation agent according to claim 5, characterized in that: The ultrasonic power of the ultrasonic treatment is 300-500W.

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