Beneficiation reagent for copper-molybdenum mine and preparation method of beneficiation reagent

Abstract

The invention belongs to the technical field of mineral flotation, and particularly relates to a beneficiation reagent for copper-molybdenum ore and a preparation method thereof. The beneficiation reagent for the copper molybdenum mine is prepared from the following raw materials in parts by weight: 20 to 30 parts of diesel oil, 10 to 20 parts of 4-hydroxybutyl vinyl ether, 5 to 20 parts of 9, 10-bis (3-mercaptopropoxy)-N-(piperidine-3-yl) octadecanamide and 5 to 20 parts of thiocarbamate. The structural formula of the 9, 10-bis (3-mercaptopropoxy)-N-(piperidine-3-yl) octadecane amide is as follows: # imgabs 0 #. The beneficiation reagent for the copper-molybdenum ore has good dispersity and flowability, can uniformly cover the surface of the ore, is good in selectivity and high in collecting capacity for the copper-molybdenum ore, and can effectively improve the flotation efficiency of the ore and obtain high-grade and high-recovery-rate copper-molybdenum concentrate.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral flotation, and in particular relates to a beneficiation agent for copper-molybdenum ores and a preparation method thereof. Background Art

[0002] Porphyry copper ore is one of the main sources of copper. Its main copper mineral is chalcopyrite, which is usually associated with molybdenite. Since copper sulfide minerals and molybdenite have similar floatability and are easy to float, traditional flotation processes are difficult to achieve efficient separation, resulting in low grade and insufficient recovery of copper-molybdenum mixed concentrates, and the subsequent separation process is complicated and costly.

[0003] The flotation separation of copper-molybdenum ore usually adopts two main process flows: mixed flotation and separation flotation. Since copper minerals (such as chalcopyrite) and molybdenum minerals (such as molybdenite) have similar surface properties, collectors with good collection ability for both can be used for co-floatation in the mixed flotation stage. At present, the flotation of copper-molybdenum ore mainly relies on two types of reagents, xanthate collectors and oleic acid reagents. Xanthate collectors chemically adsorb copper ions on the surface of copper minerals and molybdenum ions on the surface of molybdenum minerals, making the surface hydrophobicity of the minerals enhanced, so that they are captured and floated into the foam by bubbles. Although they can adsorb copper and molybdenum minerals at the same time, they have poor selectivity and are prone to gangue entrainment, which limits the concentrate grade. Oleic acid reagents are sensitive to pH, have poor stability in complex slurry environments, and the molybdenum recovery rate is generally less than 70%.

[0004] Therefore, it is urgent to develop a copper-molybdenum ore dressing agent that can take into account the high recovery rate of copper and molybdenum, so as to improve the dressing efficiency, enhance the product quality, and minimize the waste of resources. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the primary purpose of the present invention is to provide a beneficiation agent for copper-molybdenum ores, which has good dispersibility and fluidity, good selectivity for copper-molybdenum minerals, strong capture ability, effectively improves the flotation efficiency of minerals, and obtains copper-molybdenum concentrates with high grade and high recovery rate.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned copper-molybdenum ore dressing agent, which has a simple preparation process, a wide source of raw materials, and good application prospects.

[0007] The purpose of the present invention is achieved through the following technical solutions: A beneficiation agent for copper-molybdenum ore, comprising the following raw materials by weight: 20 to 30 parts of diesel, 10 to 20 parts of 4-hydroxybutyl vinyl ether, 5 to 20 parts of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecaneamide, and 5 to 20 parts of thiocarbamate; The structural formula of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide is as follows: .

[0008] Furthermore, the preparation process of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide is as follows: (1) Add acetyl-3-bromopropanethiol, methyl 9,10-dihydroxyoctadecanoate and molecular sieve into dichloromethane, stir at -5 to 5 °C under an inert gas atmosphere, then add silver trifluoromethanesulfonate and trimethylsilyl trifluoromethanesulfonate, and keep the temperature for reaction; after the reaction is completed, perform post-treatment to obtain Intermediate 1; The structural formula of the Intermediate 1 is: (2) Add Intermediate 1 to methanol, then add sodium hydroxide solution for reaction, concentrate to remove methanol, and then add hydrochloric acid solution for acidification, and perform post-treatment to obtain Intermediate 2; The structural formula of the Intermediate 2 is: (3) Add Intermediate 2 to dichloromethane, then add 3-aminopiperidine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 4-dimethylaminopyridine for reaction; after the reaction is completed, perform post-treatment to obtain 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide.

[0009] Furthermore, in step (1), the molar ratio of acetyl-3-bromopropanethiol, methyl 9,10-dihydroxyoctadecanoate, silver trifluoromethanesulfonate and trimethylsilyl trifluoromethanesulfonate is 1:(1.1 - 1.5):(1.2 - 1.5):(0.1 - 0.3); the mass ratio of the molecular sieve to acetyl-3-bromopropanethiol is (1 - 1.5):1.

[0010] Furthermore, in step (1), the stirring time is 20 - 30 min; the temperature-keeping reaction time is 5 - 10 min.

[0011] Furthermore, in step (2), the dosage ratio of Intermediate 1, methanol, and sodium hydroxide solution is 1 mmol:(5 - 8) mL:(25 - 35) mL; the concentration of the sodium hydroxide solution is 0.5 - 1 mol / L; the reaction time is 2 - 5 h.

[0012] Further, in step (3), the molar ratio of intermediate 2, 3-aminopiperidine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 4-dimethylaminopyridine is 1:(1.1 - 1.2):(1.2 - 1.5):(1.2 - 1.5); the reaction time is 3 - 5 h.

[0013] Further, the thiocarbamate is selected from at least one of O-isopropyl ethylthiocarbamate and N-allyl-O-isobutyl-thiocarbamate; the diesel oil is light diesel oil.

[0014] For the preparation method of the ore dressing reagent for copper molybdenum ore, according to the described parts by weight, vinyl n-butyl ether, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide, and thiocarbamate are mixed, and then diesel oil is added and stirred to obtain the ore dressing reagent for molybdenum ore.

[0015] Further, the stirring time is 20 - 40 min.

[0016] The present invention has the following effects compared with the prior art: 1. The ore dressing reagent for copper molybdenum ore provided by the present invention, through the scientific ratio of diesel oil, 4-hydroxybutyl vinyl ether, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide, and thiocarbamate, not only has good dispersibility and fluidity, can uniformly cover the surface of minerals, but also has good selectivity for copper molybdenum minerals and strong collecting ability, can effectively improve the flotation efficiency of minerals, and obtain copper molybdenum concentrates with high grade and relatively high recovery rate.

[0017] 2. Each component in the ore dressing reagent for copper molybdenum ore of the present invention cooperates with each other. Among them, diesel oil is a conventional collector, which has good hydrophobicity and can adsorb on the surface of minerals to enhance the adhesion between minerals and bubbles; 4-hydroxybutyl vinyl ether improves the dispersibility of the pulp through hydrophilic-hydrophobic amphiphilicity, and assists diesel oil, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide, and thiocarbamate to uniformly cover the surface of minerals, thereby indirectly optimizing the hydrophobic effect; 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide has long carbon chain hydrophobic groups and active groups such as mercapto and nitrogen elements in its structure. The hydrophobic groups can significantly improve the hydrophobicity of the mineral surface, making it more easily collected by bubbles, and the active groups such as mercapto and nitrogen elements form stable coordination bonds with metal ions on the mineral surface, thereby enhancing the selectivity for copper molybdenum ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the synthesis process of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide of the present invention. DETAILED DESCRIPTION

[0019] The technical scheme of the present invention is further described below in conjunction with specific embodiments. However, it should be understood by those skilled in the art that the following examples are only used to illustrate the present invention and should not be regarded as limiting the present invention. The specific conditions not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, unless otherwise specified, are conventional products obtained through commercial channels.

[0020] Example 1 A beneficiation agent for copper-molybdenum ore comprises the following raw materials, measured by weight: 25 parts of light diesel oil, 15 parts of 4-hydroxybutyl vinyl ether, 12 parts of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanoic acid amide, and 13 parts of N-allyl-O-isobutyl-thiocarbamate.

[0021] The structural formula of the above 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanoic acid amide is as follows: .

[0022] The preparation process of the 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanoic acid amide is as follows: Figure 1 As shown, the specific steps are as follows: (1) Acetyl-3-bromopropanethiol (CAS: 928-46-1, 10 mmol), methyl 9,10-dihydroxyoctadecanoate (CAS: 1115-01-1, 12 mmol) and 4Å molecular sieves (2 g) were added to 30 mL of dichloromethane in sequence, stirred at 0°C under nitrogen atmosphere for 25 min, and then silver trifluoromethanesulfonate (AgOTf, 14 mmol) and trimethylsilyl trifluoromethanesulfonate (TMSOTf, 2 mmol) were added and kept warm for 10 min. The reaction solution was neutralized with triethylamine to pH 7, filtered, and the filtrate was concentrated and separated and purified on a silica gel column (ethyl acetate / petroleum ether volume 10:90) to obtain intermediate 1 (yield 83.2%). 1 H NMR (C 29 H 54 O6S2,400 MHz, CDCl3): δ 3.65 (s, 3H), 3.41-3.28 (m, 10H), 2.35 (t, 2H), 2.33 (s,6H), 2.18-2.15 (m, 4H), 1.70-1.68 (m, 2H), 1.45-1.30 (m, 24H), 0.92 (s, 3H);HRMS (ESI + ): [M+H]+ Calculated to be 563.34, found to be 563.32.

[0023] (2) Add intermediate 1 (10 mmol) to 60 mL of methanol, then add 300 mL of 0.8 M sodium hydroxide solution, and react at room temperature for 4 h; concentrate to remove methanol, acidify with 1 M hydrochloric acid solution, then extract with ethyl acetate 3 times, dry over anhydrous sodium sulfate, filter and concentrate, and purify the crude product by column chromatography (the volume ratio of methanol / dichloromethane is 8:92) to obtain intermediate 2 (yield 78.8%); 1 H NMR(C 24 H 48 O4S2, 400 MHz, CDCl3): δ 3.41 - 3.35 (m, 6H), 2.56 (t, 4H), 2.25 (t, 2H), 1.81 - 1.79 (m, 4H), 1.59 - 1.57 (m, 2H), 1.45 - 1.30 (m, 24H), 0.92 (s, 3H); HRMS (ESI+): [M+H] + Calculated to be 465.30, found to be 465.30.

[0024] (3) Add intermediate 2 (10 mmol) to 60 mL of dichloromethane, then add 3 - aminopiperidine (11 mmol), 1-(3 - dimethylaminopropyl)-3 - ethylcarbodiimide hydrochloride (EDCI, 13 mmol), 4 - dimethylaminopyridine (DMAP, 13 mmol), and react at room temperature for 4 h; wash the reaction solution successively with 1 M hydrochloric acid aqueous solution and water, then dry the dichloromethane phase over anhydrous sodium sulfate, filter and concentrate, and purify the crude product by column chromatography (the volume ratio of methanol / dichloromethane is 8:92) to obtain 9,10 - bis(3 - mercaptopropoxy)-N-(piperidin - 3 - yl)octadecanamide (yield 72.9%); 1 H NMR(C 29 H 58 N2O3S2, 400MHz, DMSO - d6): δ 8.15 (s, 1H), 3.63 - 3.61 (m, 1H), 3.37 - 3.32 (m, 6H), 3.07 - 2.72 (m, 4H), 2.54 (t, 4H), 2.02 - 1.45 (m, 13H), 1.38 - 1.28 (m, 26H), 0.89 (s,3H); HRMS (ESI + ): [M+H] + Calculated to be 547.39, found to be 547.38.

[0025] This embodiment also provides a preparation method of the above-mentioned ore dressing agent for copper molybdenum ore, and the specific steps are as follows: According to the above weight parts, mix 4-hydroxybutyl vinyl ether, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide, and N-allyl-O-isobutyl-thiocarbamate, and then add light diesel and stir for 30 min to obtain the ore dressing agent for molybdenum ore.

[0026] Example 2 An ore dressing agent for copper molybdenum ore, calculated by weight parts, comprises the following raw materials: 20 parts of light diesel, 10 parts of 4-hydroxybutyl vinyl ether, 5 parts of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide, and 5 parts of O-isopropyl ethylthiocarbamate.

[0027] The structural formula of the above 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl) octadecanamide is the same as that in Example 1, and its preparation process is as Figure 1 shown, and the specific steps are as follows: (1) Add acetyl-3-bromopropyl mercaptan (10 mmol), methyl 9,10-dihydroxyoctadecanoate (11 - 15 mmol), and 4 Å molecular sieve (3 g) to 30 mL of dichloromethane in sequence, stir at 5 °C under a nitrogen atmosphere for 20 min, then add AgOTf (12 mmol) and TMSOTf (1 mmol), and keep the temperature for reaction for 5 min; neutralize the reaction solution with triethylamine to pH 7, filter, concentrate the filtrate, and perform separation and purification on a silica gel column (the volume ratio of ethyl acetate / petroleum ether is 10:90) to obtain Intermediate 1 (yield 82.7%); 1 H NMR and HRMS (ESI + ) are consistent with the results in Example 1.

[0028] (2) Add Intermediate 1 (10 mmol) to 50 mL of methanol, then add 250 mL of 1 M sodium hydroxide solution, and react at room temperature for 2 h; concentrate to remove methanol, acidify with 1 M hydrochloric acid solution, then extract with ethyl acetate 3 times, dry with anhydrous sodium sulfate, filter and concentrate, and purify the crude product by column chromatography (the volume ratio of methanol / dichloromethane is 8:92) to obtain Intermediate 2 (yield 78.4%); 1 H NMR and HRMS (ESI + ) are consistent with the results in Example 1.

[0029] (3) Add intermediate 2 (10 mmol) to 50 mL of dichloromethane, then add 3-aminopiperidine (11 mmol), EDCI (12 mmol), and DMAP (15 mmol), and react at room temperature for 3 h; wash the reaction solution successively with 1M aqueous hydrochloric acid and water, then dry the dichloromethane phase with anhydrous sodium sulfate, filter, concentrate, and purify the crude product by column chromatography (the volume ratio of methanol / dichloromethane is 8:92) to obtain 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide (yield 73.4%); 1 HNMR and HRMS (ESI + ) are consistent with the results of Example 1.

[0030] This example also provides a preparation method of the ore dressing agent for copper molybdenite, and the specific steps are as follows: According to the above weight parts, mix 4-hydroxybutyl vinyl ether, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide, and O-isopropyl ethylthiocarbamate, and then add light diesel and stir for 20 min to obtain the ore dressing agent for molybdenite.

[0031] Example 3 An ore dressing agent for copper molybdenite, calculated by weight parts, comprises the following raw materials: 30 parts of light diesel, 20 parts of 4-hydroxybutyl vinyl ether, 20 parts of 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide, 10 parts of O-isopropyl ethylthiocarbamate, and 10 parts of N-allyl-O-isobutyl-thiocarbamate.

[0032] The structural formula of the above 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide is the same as that in Example 1, and its preparation process is as Figure 1 shown, and the specific steps are as follows: (1) Add acetyl-3-bromopropyl mercaptan (10 mmol), methyl 9,10-dihydroxyoctadecanoate (11 - 15 mmol), and 4 Å molecular sieve (2 g) to 30 mL of dichloromethane in sequence, stir at -5 °C under a nitrogen atmosphere for 30 min, then add AgOTf (15 mmol) and TMSOTf (3 mmol), and keep the temperature for reaction for 10 min; neutralize the reaction solution with triethylamine to pH 7, filter, concentrate the filtrate, and carry out separation and purification on a silica gel column (the volume ratio of ethyl acetate / petroleum ether is 10:90) to obtain intermediate 1 (yield 83.6%); 1 H NMR and HRMS (ESI + ) are consistent with the results of Example 1.

[0033] (2) Add intermediate 1 (10 mmol) to 80 mL of methanol, then add 350 mL of 0.5 M sodium hydroxide solution, and react at room temperature for 5 h; concentrate to remove methanol, acidify with 1 M hydrochloric acid solution, then extract 3 times with ethyl acetate, dry over anhydrous sodium sulfate, filter and concentrate, and purify the crude product by column chromatography (the volume ratio of methanol / dichloromethane is 8:92) to obtain intermediate 2 (yield 78.5%); 1 H NMR and HRMS (ESI + ) are consistent with the results of Example 1.

[0034] (3) Add intermediate 2 (10 mmol) to 70 mL of dichloromethane, then add 3-aminopiperidine (12 mmol), EDCI (15 mmol), DMAP (12 mmol), and react at room temperature for 5 h; wash the reaction solution successively with 1 M hydrochloric acid aqueous solution and water, then dry the dichloromethane phase over anhydrous sodium sulfate, filter and concentrate, and purify the crude product by column chromatography (the volume ratio of methanol / dichloromethane is 8:92) to obtain 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide (yield 72.0%); 1 HNMR and HRMS (ESI+) are consistent with the results of Example 1.

[0035] This example also provides a preparation method of the above-mentioned ore dressing agent for copper molybdenum ore, and the specific steps are as follows: According to the above weight parts, mix 4-hydroxybutyl vinyl ether, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide, O-isopropyl ethylthiocarbamate, and N-allyl-O-isobutyl-thiocarbamate, and then add light diesel and stir for 40 min to obtain the ore dressing agent for molybdenum ore.

[0036] Comparative Example 1 The content of Comparative Example 1 is basically the same as that of Example 1, and the difference is that 4-hydroxybutyl vinyl ether is omitted.

[0037] Comparative Example 2 The content of Comparative Example 1 is basically the same as that of Example 1, and the difference is that 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide is replaced by oleic acid.

[0038] Test Example Perform copper molybdenum ore flotation performance tests on the ore dressing agents prepared in Examples 1 to 3 and Comparative Examples 1 to 2, and the specific method is as follows: Take the original ore of a certain copper-molybdenum ore (Cu content 0.582%, Mo content 0.014%) for grinding to make the content of materials with a particle size less than 0.074 mm be 60 - 65%. Add a pH adjuster (CaO, 1000 g / t). After pulp mixing for 2 min, add the ore dressing reagents obtained in Examples 1 - 3 or Comparative Examples 1 - 2 (30 g / t). After continuing to pulp mix for 2 min, add a foaming agent (BK-201, 21 g / t). After pulp mixing again for 1 min, conduct one rough selection, two scavenging selections, and three cleaning selections. Among them, during the cleaning selection, the rough concentrate is ground until the content of materials with a particle size less than 0.045 mm is 90%. In the first cleaning selection, water glass is added with a dosage of 140 g / t. The cleaning tailings after the first cleaning selection, the second cleaning selection, and the third cleaning selection are respectively returned to the rough selection, the first cleaning selection, and the second cleaning selection. The rough concentrate is made into the final concentrate after three cleaning selections. During the scavenging selection, 15 g / t and 7.5 g / t of the ore dressing reagents obtained in Examples 1 - 3 or Comparative Examples 1 - 2 are respectively added in the first scavenging selection and the second scavenging selection. The specific test results are shown in Table 1: Table 1 As can be seen from Table 1, the ore dressing reagents prepared in Examples 1 - 3 of the present invention can take into account the grades and recovery rates of copper and molybdenum, and obtain copper-molybdenum concentrates with high grades and relatively high recovery rates.

[0039] Compared with Example 1, in Comparative Example 1, 4-hydroxybutyl vinyl ether in Example 1 was omitted, and in Comparative Example 2, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide was replaced with oleic acid. The grades of copper and molybdenum and the recovery rates of copper and molybdenum in the copper-molybdenum concentrate all decreased. Analyzing the reasons, it can be known that: in the ore dressing reagents for copper-molybdenum ore in Examples 1 - 3 of the present invention, the components cooperate with each other. Among them, diesel is a conventional collector with good hydrophobicity, which can adsorb on the mineral surface and enhance the adhesion between the mineral and the bubbles; 4-hydroxybutyl vinyl ether improves the dispersibility of the pulp through hydrophilic-hydrophobic amphiphilicity, and assists diesel, 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide, and thiocarbamate to uniformly cover the mineral surface, thereby indirectly optimizing the hydrophobic effect; 9,10-bis(3-mercaptopropoxy)-N-(piperidin-3-yl)octadecanamide has long carbon chain hydrophobic groups and active groups such as mercapto and nitrogen elements in its structure. The hydrophobic groups can significantly improve the hydrophobicity of the mineral surface, making it more easily captured by bubbles. The active groups such as mercapto and nitrogen elements form stable coordination bonds with metal ions on the mineral surface, thereby enhancing the selectivity for copper-molybdenum ore.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. The basic principles and main features of the present invention have been described in the above with specific implementation schemes. On the basis of the present invention, some modifications or replacements can be made to it, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of protection required by the present invention.

Claims

1. A beneficiation reagent for copper-molybdenum ore, characterized in that, By weight parts, it includes the following raw materials: 20 - 30 parts of diesel oil, 10 - 20 parts of 4 - hydroxybutyl vinyl ether, 5 - 20 parts of 9,10 - bis(3 - mercaptopropoxy)-N-(piperidin - 3 - yl) octadecanamide, and 5 - 20 parts of thiocarbamate; The structural formula of the 9,10 - bis(3 - mercaptopropoxy)-N-(piperidin - 3 - yl) octadecanamide is as follows: 。 2. The ore dressing agent for copper molybdenum ore according to claim 1, characterized in that, The preparation process of the 9,10 - bis(3 - mercaptopropoxy)-N-(piperidin - 3 - yl) octadecanamide is as follows: (1) Add acetyl - 3 - bromopropyl mercaptan, methyl 9,10 - dihydroxyoctadecanoate, and molecular sieve into dichloromethane, stir at - 5 - 5 °C under an inert gas atmosphere, then add silver trifluoromethanesulfonate and trimethylsilyl trifluoromethanesulfonate, and keep the temperature for reaction; after the reaction is completed, perform post - treatment to obtain intermediate 1; The structural formula of the intermediate 1 is: (2) Add intermediate 1 to methanol, then add sodium hydroxide solution for reaction, concentrate to remove methanol, and then add hydrochloric acid solution for acidification, and perform post - treatment to obtain intermediate 2; The structural formula of the intermediate 2 is: (3) Add intermediate 2 to dichloromethane, then add 3 - aminopiperidine, 1 - (3 - dimethylaminopropyl)-3 - ethylcarbodiimide hydrochloride, and 4 - dimethylaminopyridine for reaction; after the reaction is completed, perform post - treatment to obtain the 9,10 - bis(3 - mercaptopropoxy)-N-(piperidin - 3 - yl) octadecanamide.

3. The ore dressing agent for copper-molybdenum ore according to claim 2, characterized in that, In step (1), the molar ratio of acetyl - 3 - bromopropyl mercaptan, methyl 9,10 - dihydroxyoctadecanoate, silver trifluoromethanesulfonate, and trimethylsilyl trifluoromethanesulfonate is 1:(1.1 - 1.5):(1.2 - 1.5):(0.1 - 0.3); the mass ratio of the molecular sieve to acetyl - 3 - bromopropyl mercaptan is (1 - 1.5):

1.

4. The ore dressing reagent for copper-molybdenum ore according to claim 2, characterized in that, In step (1), the stirring time is 20 - 30 min; the time for the temperature - keeping reaction is 5 - 10 min.

5. The ore dressing reagent for copper-molybdenum ore according to claim 2, wherein, In step (2), the dosage ratio of intermediate 1, methanol, and sodium hydroxide solution is 1 mmol:(5 - 8) mL:(25 - 35) mL; the concentration of the sodium hydroxide solution is 0.5 - 1 mol / L; the reaction time is 2 - 5 h.

6. The ore dressing reagent for copper molybdenum ore according to claim 2, wherein, In step (3), the molar ratio of intermediate 2, 3 - aminopiperidine, 1 - (3 - dimethylaminopropyl)-3 - ethylcarbodiimide hydrochloride, and 4 - dimethylaminopyridine is 1:(1.1 - 1.2):(1.2 - 1.5):(1.2 - 1.5); the reaction time is 3 - 5 h.

7. The ore dressing reagent for copper-molybdenum ore according to claim 1, wherein, The thiocarbamate is selected from at least one of O - isopropyl ethylthiocarbamate and N - allyl - O - isobutyl - thiocarbamate; the diesel oil is light diesel oil.

8. The preparation method of the ore dressing reagent for copper molybdenum ore according to any one of claims 1 to 7, characterized in that, According to the above - mentioned weight parts, mix vinyl n - butyl ether, 9,10 - bis(3 - mercaptopropoxy)-N-(piperidin - 3 - yl) octadecanamide, and thiocarbamate, and then add diesel oil and stir to obtain the beneficiation reagent for molybdenum ore.

9. The preparation method of the ore dressing reagent for copper molybdenum ore according to claim 8, characterized in that, The stirring time is 20 - 40 min.

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