Collecting agent for copper-nickel sulfide ore under acidic condition and preparation method of collecting agent

Abstract

The invention relates to a collecting agent for copper-nickel sulfide ore under an acidic condition and a preparation method of the collecting agent. The structure of the collecting agent is shown as a formula I, wherein R1 is one of C1-C5 alkyl groups. Meanwhile, the invention further discloses a preparation method of the collecting agent. The collecting agent contains an ether functional group, so that the interaction between the collecting agent and minerals is enhanced, and the collecting agent has excellent coordination capacity with metal hydroxide, so that the surface activity and selectivity are enhanced.

Description

Technical Field

[0001] This invention relates to the field of sulfide ore flotation technology, and in particular to a collector for acidic copper-nickel sulfide ore and its preparation method. Background Technology

[0002] Nickel and copper are both important non-ferrous metals with significant applications in industries such as stainless steel, chemicals, batteries, power, and electronics. With rapid economic development, the demand for nickel and copper continues to increase. Copper-nickel sulfide ores are a major source of copper and nickel; however, with continuous mining, the ore grade is low, the particle size is fine, and the symbiotic relationships are complex, making flotation recovery more difficult. Therefore, it is necessary to find new collectors and flotation technologies to solve the mineral recovery problem.

[0003] Acidic conditions not only clean the surface of sulfide ores and improve their floatability, but also remove impurities and reduce reagent costs. Furthermore, sulfuric acid is a byproduct of sulfide ore smelting, posing safety and cost concerns. If the flotation process for nickel-copper sulfide ores can be carried out under acidic conditions, it would not only consume unsold sulfuric acid but also improve resource utilization.

[0004] Common xanthate collectors (xanthates) are prone to decomposition in acidic media, leading to difficulties in mineral recovery. Dialkyl dithiophosphate (black reagent) is second only to xanthates in terms of applications. It not only exhibits better stability and selectivity under acidic conditions but also possesses foaming properties, which helps reduce reagent dosage. Currently, there are no reports on the application of ether-based dithiophosphate collectors in acidic flotation conditions for copper-nickel sulfide ores. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a collector for copper-nickel sulfide ores with good performance under acidic conditions.

[0006] Another technical problem to be solved by the present invention is to provide a method for preparing a collector for copper-nickel sulfide ore under acidic conditions.

[0007] To solve the above problems, the present invention provides a collector for acidic copper-nickel sulfide ores, characterized in that: the structure of the collector is shown in Formula I: Equation I is ; R1 is one of the C1 to C5 alkyl groups.

[0008] R1 is one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1-ethylpropyl, neopentyl, and tert-pentyl.

[0009] This method involves mixing an ether alcohol compound with phosphorus pentasulfide in an excess toluene solution, reacting the mixture with stirring and heating, and then removing the toluene by vacuum distillation to obtain an alkyl dithiophosphate collector.

[0010] The molar ratio of the ether alcohol compound to the phosphorus pentasulfide is 4~6:1.

[0011] The method for preparing a collector for copper-nickel sulfide ore under acidic conditions as described above is characterized in that: the structure of the ether alcohol compound is as shown in Formula II: Formula II is ; R2 is one of the C1 to C5 alkyl groups.

[0012] R2 is one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1-ethylpropyl, neopentyl, and tert-pentyl.

[0013] The conditions for the heating reaction are a reaction temperature of 60~140℃ and a reaction time of 4~12h.

[0014] The application of a collector for copper-nickel sulfide ore under acidic conditions as described above is characterized in that: the collector is used to float copper-nickel sulfide ore in an acidic medium with a pH of 3 to 5, and the amount of collector used is 50 to 250 g / t based on the weight of the raw ore.

[0015] The pH value was adjusted using sulfuric acid.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The collector of the present invention contains an ether functional group, which not only enhances the interaction between the collector and the mineral, but also has excellent coordination ability with metal hydroxides, thereby enhancing surface activity and selectivity.

[0017] 2. The alkyl dithiophosphate collector of the present invention has excellent collecting performance under acidic conditions; at the same time, it has foaming properties, which can effectively reduce the amount of foaming agent used, thereby reducing the cost of the reagent.

[0018] 3. The collector of the present invention can not only utilize sulfuric acid, a byproduct generated during the smelting of sulfide ores, under acidic conditions, but also significantly improve the flotation recovery rate of nickel and copper metals in the concentrate with low reagent dosage.

[0019] 4. The preparation process of this invention is simple and efficient, the post-processing is simple, it is easy to industrialize, and the raw materials are widely available, which can improve resource utilization. Attached Figure Description

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 Nuclear magnetic resonance of bis(1-methoxy-2-propyl)dithiophosphate provided in Example 1 of this invention 1 H spectrum.

[0022] Figure 2 Nuclear magnetic resonance of bis(1-methoxy-2-propyl)dithiophosphate provided in Example 1 of this invention 13 C-spectrum.

[0023] Figure 3 The mass spectrum of bis(1-methoxy-2-propyl)dithiophosphoric acid provided in Example 1 of the present invention.

[0024] Figure 4 The infrared spectrum of bis(1-methoxy-2-propyl)dithiophosphoric acid provided in Example 1 of the present invention.

[0025] Figure 5 Nuclear magnetic resonance of bis(1-ethoxy-2-propyl)dithiophosphate provided in Example 2 of this invention 1 H spectrum.

[0026] Figure 6 Nuclear magnetic resonance of bis(1-ethoxy-2-propyl)dithiophosphate provided in Example 2 of this invention 13 C-spectrum.

[0027] Figure 7 The mass spectrum of bis(1-ethoxy-2-propyl)dithiophosphoric acid provided in Example 2 of the present invention.

[0028] Figure 8 The infrared spectrum of bis(1-ethoxy-2-propyl)dithiophosphoric acid provided in Example 2 of the present invention.

[0029] Figure 9 Nuclear magnetic resonance of di(1-propoxy-2-propyl)dithiophosphate provided in Example 3 of this invention 1 H spectrum.

[0030] Figure 10 Nuclear magnetic resonance of di(1-propoxy-2-propyl)dithiophosphate provided in Example 3 of this invention 13 C-spectrum.

[0031] Figure 11 The mass spectrum of di(1-propoxy-2-propyl)dithiophosphoric acid provided in Example 3 of the present invention.

[0032] Figure 12The infrared spectrum of di(1-propoxy-2-propyl)dithiophosphoric acid provided in Example 3 of the present invention.

[0033] Figure 13 The following are application examples 1-3 of this invention: open-circuit flotation process using a collector and a frother.

[0034] Figure 14 The following are open-circuit flotation flow charts for application examples 1-3 of this invention using alkyl dithiophosphate collectors. Detailed Implementation

[0035] A collector for copper-nickel sulfide ores under acidic conditions, the structure of which is shown in Formula I: Equation I is ; Wherein, R1 is one of C1~C5 alkyl groups, preferably one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1-ethylpropyl, neopentyl and tert-pentyl.

[0036] The collector is prepared by mixing an ether alcohol compound with phosphorus pentasulfide in an excess toluene solution at a molar ratio of 4 to 6:1 and stirring and heating at 60 to 140°C for 4 to 12 hours. After the reaction is completed, the toluene is removed by vacuum distillation to obtain the alkyl dithiophosphate collector.

[0037] Among them, the structures of ether alcohol compounds are shown in Formula II: Formula II is ; Wherein, R2 is one of C1~C5 alkyl groups, preferably one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1-ethylpropyl, neopentyl and tert-pentyl.

[0038] Application of a collector for flotation of copper-nickel sulfide ore under acidic conditions. This collector is used in an acidic medium with a pH of 3-5 for flotation of copper-nickel sulfide ore, and the dosage of the collector is 50-250 g / t based on the weight of the raw ore. The pH is adjusted using sulfuric acid.

[0039] The scope of protection of this invention is not limited to the following specific embodiments. Unless otherwise stated, all reagents used in the following embodiments are commercially available reagents. Example

[0040] Preparation of di(1-methoxy-2-propyl)dithiophosphoric acid: 9.88 g of 1-methoxy-2-propanol was added to 15 ml of toluene solution, followed by the slow addition of 4.66 g of phosphorus pentasulfide. The temperature was raised to about 90 °C, and the reaction time was 6 h. After the reaction was completed, toluene was removed by vacuum distillation to obtain an alkyl dithiophosphate collector suitable for acidic conditions.

[0041] The obtained di(1-methoxy-2-propyl)dithiophosphoric acid was characterized.

[0042] Nuclear magnetic resonance 1 H spectrum Figure 1 The results are as follows: 1 H NMR (600 MHz, Chloroform- d ) δ 4.89 (s,2H), 3.90 (s, 1H), 3.52 (s, 4H), 3.41 (s, 6H), 1.39 (s, 6H). Nuclear magnetic resonance 13 See C spectrum Figure 2 The results are as follows: 13 C NMR (151 MHz, Chloroform- d ) δ 75.93,59.33, 52.82, 18.38. Mass spectrometry analysis is shown in Figure 3 The results are as follows: MS (EI): [C8H 18 O4PS2] ﹣ =273.05 Infrared spectrum Figure 4 The infrared spectral analysis is shown in Table 1.

[0043] Table 1. Infrared Spectral Analysis of Di(1-Methoxy-2-propyl)Dithiophosphate Example

[0044] Preparation of bis(1-ethoxy-2-propyl)dithiophosphoric acid: 10.45 g of 1-ethoxy-2-propanol was added to 15 ml of toluene solution, followed by the slow addition of 4.85 g of phosphorus pentasulfide. The temperature was raised to about 90 °C and the reaction time was 6 h. After the reaction was completed, toluene was removed by vacuum distillation to obtain an alkyl dithiophosphate collector under acidic conditions.

[0045] The obtained di(1-ethoxy-2-propyl)dithiophosphoric acid was characterized.

[0046] Nuclear magnetic resonance 1 H spectrum Figure 5 The results are as follows: 1H NMR (600 MHz, Chloroform- d ) δ 4.84 (s, 2H), 3.64 (s, 4H), 3.54 (s, 4H), 1.71 (s, 1H), 1.36 (s, 6H), 1.25 (s, 6H). Nuclear magnetic resonance 13 See C spectrum Figure 6 The results are as follows: 13 C NMR (151 MHz, Chloroform- d ) δ 73.85,72.89, 67.18, 18.56, 15.11. Mass spectrometry analysis is shown in Figure 7 The results are as follows: MS (EI): [C 10 H 22 O4PS2] ﹣ =301.08 Infrared spectrum Figure 8 The infrared spectral analysis is shown in Table 2.

[0047] Table 2. Infrared Spectral Analysis of Di(1-ethoxy-2-propyl)dithiophosphate Example

[0048] Preparation of di(1-propoxy-2-propyl)dithiophosphoric acid: 9.88 g of 1-propoxy-2-propanol was added to 15 ml of toluene solution, followed by the slow addition of 4.66 g of phosphorus pentasulfide. The temperature was raised to about 90 °C and the reaction time was 6 h. After the reaction was completed, toluene was removed by vacuum distillation to obtain an alkyl dithiophosphate collector under acidic conditions.

[0049] The obtained di(1-propoxy-2-propyl)dithiophosphoric acid was characterized.

[0050] Nuclear magnetic resonance 1 H spectrum Figure 9 The results are as follows: 1 H NMR (600 MHz, Chloroform- d ) δ 4.82 (s, 2H), 3.66 (s, 4H), 3.42 (s, 4H), 2.74 (s, 1H), 1.65 (s, 4H), 1.34 (s, 6H), 0.93 (s, 6H). Nuclear magnetic resonance 13 See C spectrum Figure 10 The results are as follows: 13C NMR (151 MHz, Chloroform- d ) δ 74.04,73.58, 73.09, 22.73, 18.51, 10.43. Mass spectrometry analysis is shown in Figure 11 The results are as follows: MS (EI): [C 12 H 26 O4PS2] ﹣ =329.15 Infrared spectrum Figure 12 The infrared spectral analysis is shown in Table 3.

[0051] Table 3. Infrared Spectral Analysis of Di(1-Propoxy-2-propyl)dithiophosphate

[0052]

application

[0053] Table 4 Ore Properties (A copper-nickel sulfide ore in Gansu)

[0054] Application Example 1 Flotation process: The two-stage flotation open-circuit test process flow verifies the improved nickel-copper recovery rate of the concentrate by the collector of this invention. The flow flow is as follows: Figure 13 and Figure 14 The specific implementation method is as follows: 1. Grinding: For each open-circuit flotation, 800 g of copper-nickel sulfide ore was weighed, and the grinding concentration was 50%. In the experiment, the proportion of -0.074 mm particles in the first stage of grinding was 75.9%, and the grinding time was 12 min (i.e., 12' in the figure). The second stage of grinding took 6 min. 0.074 mm refers to the particle size of the mineral after passing through the grinding mill and entering the flotation cell.

[0055] 2. In the rough scavenging flotation operation, the order of reagent addition is activator, collector, and frother. The dosage and pulp conditioning time are as follows: Figures 13-14 As shown. After the reagent addition is completed, the first stage undergoes two cleaning processes to obtain concentrate K1 and middlings N1; in the second stage roughing, the reagent addition sequence is as follows: first, sulfuric acid is added to adjust the pH to 4, then an activator, collector, and frother or the collector obtained in Example 1 is added. The dosage and slurry conditioning time are as follows. Figures 13-14As shown. The reagent addition sequence for the two-stage scavenging process is collector and frother or the collector obtained in Example 1. After reagent addition, concentrate K2, middlings 2 and middlings 3 are obtained through two cleaning processes, and middlings 4, middlings 5 ​​and tailings are obtained through two scavenging processes. Open-circuit flotation yields a total of 2 concentrates, 5 middlings (combined into middlings N1, N2+N3 and N4+N5) and tailings.

[0056] 3. Dosing regimen (key differences lie in collectors and frothers): Comparative Example 1: The second stage of the flotation process used 60 g / t of collector and 40 g / t of frother, totaling 100 g / t.

[0057] Example 1: Collector for the second stage of the flotation process: The total amount of the reagent of this invention is 60 g / t.

[0058] 4. Compare the flotation effect of the collector concentrate obtained from the two sets of experiments with the concentrate grade / recovery rate obtained. The results are shown in Table 5.

[0059] Table 5 Comparison of open-circuit flotation results between Comparative Example 1 and Example 1

[0060] Analysis of experimental data from Comparative Example 1 and Example 1: Reduced reagent dosage: In Example 1, the total collector dosage was 60 g / t; in Comparative Example 1, the collector dosage was 60 g / t and the foaming agent dosage was 40 g / t, totaling 100 g / t. This 40% reduction in reagent dosage significantly lowers reagent costs and reduces environmental impact.

[0061] Improved nickel and copper recovery in total concentrate: Using the collector described in Example 1, the nickel recovery in the total concentrate was 75.19%, an increase of 2.09% compared to 73.10% in Comparative Example 1. Furthermore, the copper recovery in the total concentrate was 76.42%, an increase of 1.32% compared to 75.10% in Comparative Example 1. This improvement in the recovery of copper-nickel sulfide ores demonstrates that the collector of the present invention provides improved foam stability and bubble-mineral attachment kinetics, without substantially affecting the total concentrate yield (16.30% vs. 15.80%).

[0062] Reduction in copper grade in tailings: Using the collector described in Example 1, the copper grade in the tailings was reduced to 0.19%, a decrease of 0.01% compared to 0.20% in Comparative Example 1. This indicates that the collector of the present invention has a good effect on reducing the copper grade in tailings, thereby reducing resource waste.

[0063] In summary, this invention provides a novel dual-function collector-foaming agent suitable for acidic conditions. With a 40% reduction in the dosage of this agent, the recovery rates of nickel and copper are significantly increased by 2.09% and 1.32%, respectively, and the metal loss in tailings is effectively reduced.

[0064] Application Example 2 Flotation process: The two-stage flotation open-circuit test process flow verifies the improved nickel-copper recovery rate of the concentrate by the collector of this invention. The flow flow is as follows: Figure 13 and Figure 14 The specific implementation method is as follows: 1. Grinding: For each open-circuit flotation, 800 g of copper-nickel sulfide ore was weighed, and the grinding concentration was 50%. In the experiment, the proportion of -0.074 mm ore in the first stage of grinding was 75.9%, and the grinding time was 12 min. The second stage of grinding time was 6 min.

[0065] 2. In the rough scavenging flotation operation, the order of reagent addition is activator, collector, and frother. The dosage and pulp conditioning time are as follows: Figures 13-14 As shown. After the reagent addition is completed, the first stage undergoes two cleaning processes to obtain concentrate K1 and middlings N1; in the second stage roughing, the reagent addition sequence is as follows: first, sulfuric acid is added to adjust the pH to 4, then an activator, collector, and frother or the collector obtained in Example 2 is added. The dosage and slurry conditioning time are as follows. Figures 13-14 As shown. The reagent addition sequence for the two-stage scavenging process is collector and frother or the collector obtained in Example 2. After reagent addition, concentrate K2, middlings 2 and middlings 3 are obtained through two cleaning processes, and middlings 4, middlings 5 ​​and tailings are obtained through two scavenging processes. Open-circuit flotation yields a total of 2 concentrates, 5 middlings (combined into middlings N1, N2+N3 and N4+N5) and tailings.

[0066] 3. Dosing regimen (key differences lie in collectors and frothers): Comparative Example 1: The second stage of the flotation process used 60 g / t of collector and 40 g / t of frother, totaling 100 g / t.

[0067] Example 2: Collector for the second stage of the flotation process: 60 g / t of the reagents of this invention.

[0068] 4. Compare the flotation effect of the collector concentrate obtained from the two sets of experiments with the concentrate grade / recovery rate obtained. The results are shown in Table 6.

[0069] Table 6 Comparison of open-circuit flotation results between Comparative Example 1 and Example 2

[0070] Analysis of experimental data from Comparative Example 1 and Example 2: Reduced reagent dosage: In Example 2, the total collector dosage was 60 g / t; in Comparative Example 1, the collector dosage was 60 g / t and the foaming agent dosage was 40 g / t, totaling 100 g / t. This 40% reduction in reagent dosage significantly lowers reagent costs and reduces environmental impact.

[0071] Improved nickel and copper recovery in total concentrate: Using the collector described in Example 2, the nickel recovery in the total concentrate was 75.28%, an increase of 2.18% compared to 73.10% in Comparative Example 1. Furthermore, the copper recovery in the total concentrate was 75.96%, an increase of 0.86% compared to 75.10% in Comparative Example 1. This improvement in the recovery of copper-nickel sulfide ores demonstrates that the collector of the present invention provides improved foam stability and bubble-mineral attachment kinetics, without substantially affecting concentrate yield (16.44% vs. 15.80%).

[0072] Reduction in nickel and copper grade in tailings: Using the collector described in Example 2, the nickel grade in the tailings was reduced to 0.17%, a decrease of 0.01% compared to 0.18% in Comparative Example 1. Furthermore, the copper grade in the tailings was reduced to 0.19%, a decrease of 0.01% compared to 0.20% in Comparative Example 1. This indicates that the collector of the present invention has a good effect on reducing the copper grade in tailings, thereby reducing resource waste.

[0073] In summary, this invention provides a novel dual-function collector-foaming agent suitable for acidic conditions. With a 40% reduction in the dosage of this agent, the recovery rates of nickel and copper are significantly increased by 2.18% and 0.86%, respectively, and the metal loss in tailings is effectively reduced.

[0074] Application Example 3 Flotation process: The two-stage flotation open-circuit test process flow verifies the improved nickel-copper recovery rate of the concentrate by the collector of this invention. The flow flow is as follows: Figure 13 and Figure 14 The specific implementation method is as follows: 1. Grinding: For each open-circuit flotation, 800 g of copper-nickel sulfide ore was weighed, and the grinding concentration was 50%. In the experiment, the proportion of -0.074 mm ore in the first stage of grinding was 75.9%, and the grinding time was 12 min. The second stage of grinding time was 6 min.

[0075] 2. In the rough scavenging flotation operation, the order of reagent addition is activator, collector, and frother. The dosage and pulp conditioning time are as follows: Figures 13-14 As shown. After the reagent addition is completed, the first stage undergoes two cleaning processes to obtain concentrate K1 and middlings N1; in the second stage roughing, the reagent addition sequence is as follows: first, sulfuric acid is added to adjust the pH to 4, then an activator, collector, and frother, or the collector obtained in Example 3, are added. The dosage and slurry conditioning time are as follows. Figures 13-14 As shown. The reagent addition sequence for the two-stage scavenging process is collector and frother or the collector obtained in Example 3. After reagent addition, concentrate K2, middlings 2 and middlings 3 are obtained through two cleaning processes, and middlings 4, middlings 5 ​​and tailings are obtained through two scavenging processes. Open-circuit flotation yields a total of 2 concentrates, 5 middlings (combined into middlings N1, N2+N3 and N4+N5) and tailings.

[0076] 3. Dosing regimen (key differences lie in collectors and frothers): Comparative Example 1: The second stage of the flotation process used 60 g / t of collector and 40 g / t of frother, totaling 100 g / t.

[0077] Example 3: Collector for the second stage of the flotation process: 60 g / t of the reagent of this invention.

[0078] 4. Compare the flotation effect of the collector concentrate obtained from the two sets of experiments with the concentrate grade / recovery rate obtained. The results are shown in Table 7.

[0079] Table 7 Comparison of open-circuit flotation results between Comparative Example 1 and Example 3

[0080] Analysis of experimental data from Comparative Example 1 and Example 3: Reduced reagent dosage: Example 3: 60 g / t of collector; Comparative Example 1: 60 g / t of collector and 40 g / t of frother, totaling 100 g / t. This 40% reduction in reagent dosage significantly lowers reagent costs and environmental impact.

[0081] Improved nickel and copper recovery in total concentrate: Using the collector described in Example 3, the nickel recovery in the total concentrate was 74.31%, an increase of 1.21% compared to 73.10% in Comparative Example 1. Furthermore, the copper recovery in the total concentrate was 76.14%, an increase of 1.04% compared to 75.10% in Comparative Example 1. This improvement in the recovery of copper-nickel sulfide ores indicates that the collector of the present invention provides improved foam stability and bubble-mineral attachment kinetics, without substantially affecting concentrate yield (15.80% vs. 15.80%).

[0082] Reduction in nickel and copper grade in tailings: Using the collector described in Example 3, the nickel grade in the tailings was reduced to 0.17%, a decrease of 0.01% compared to 0.18% in Comparative Example 1. Furthermore, the copper grade in the tailings was reduced to 0.18%, a decrease of 0.02% compared to 0.20% in Comparative Example 1. This indicates that the collector of the present invention has a good effect on reducing the copper grade in tailings, thereby reducing resource waste.

[0083] In summary, this invention provides a novel dual-function collector-foaming agent suitable for acidic conditions. With a 40% reduction in agent dosage, it significantly improves nickel and copper recovery rates by 1.21% and 1.04%, respectively, and effectively reduces metal loss in tailings.

[0084] In summary, the reagent of this invention exhibits excellent selectivity and collecting ability, making it a highly efficient flotation reagent for copper-nickel sulfide ores. This method successfully solves the problems of easy decomposition of xanthate, low nickel-copper recovery, and excessive reagent dosage during the flotation of copper-nickel sulfide ores under acidic conditions.

Claims

1. A collector for copper-nickel sulfide ores under acidic conditions, characterized in that: The structure of the collector is shown in Formula I: Equation I is ; R1 is one of the C1 to C5 alkyl groups.

2. The collector for acidic copper-nickel sulfide ores as described in claim 1, characterized in that: R1 is one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1-ethylpropyl, neopentyl, and tert-pentyl.

3. The method for preparing a collector for acidic copper-nickel sulfide ore as described in claim 1, characterized in that: This method involves mixing an ether alcohol compound with phosphorus pentasulfide in an excess toluene solution, reacting the mixture with stirring and heating, and then removing the toluene by vacuum distillation to obtain an alkyl dithiophosphate collector.

4. The method for preparing a collector for acidic copper-nickel sulfide ore as described in claim 3, characterized in that: The molar ratio of the ether alcohol compound to the phosphorus pentasulfide is 4~6:

1.

5. The method for preparing a collector for acidic copper-nickel sulfide ore as described in claim 4, characterized in that: The structure of the ether alcohol compound is shown in Formula II: Formula II is ; R2 is one of the C1 to C5 alkyl groups.

6. The method for preparing a collector for acidic copper-nickel sulfide ore as described in claim 5, characterized in that: R2 is one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1-ethylpropyl, neopentyl, and tert-pentyl.

7. The method for preparing a collector for acidic copper-nickel sulfide ore as described in claim 3, characterized in that: The conditions for the heating reaction are a reaction temperature of 60~140℃ and a reaction time of 4~12h.

8. The application of the collector for acidic copper-nickel sulfide ore as described in claim 1, characterized in that: The collector is used for flotation of nickel-copper sulfide ore in an acidic medium with a pH of 3 to 5, and the amount of collector used is 50 to 250 g / t based on the weight of the raw ore.

9. The application of the collector for acidic copper-nickel sulfide ore as described in claim 8, characterized in that: The pH value was adjusted using sulfuric acid.

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