Preparation and application methods of dual-target copper-molybdenum separation inhibitors

Abstract

This invention provides a method for preparing and applying a dual-target copper-molybdenum separation inhibitor. This invention relates to the field of mineral processing technology. The method involves mixing methanol and 4-mercaptobutyronitrile and heating under alkaline conditions, then adding dihalomethane for reaction, followed by hydrolysis. The resulting inhibitor possesses two -SH nonpolar groups and a -COONa polar group. The -SH groups exhibit polydentate coordination effects, strongly adsorbing onto the surface of copper sulfide minerals, while the -COONa groups enhance the hydrophilicity of copper sulfide minerals, thus significantly improving the difference in surface properties between molybdenite and copper sulfide minerals. Furthermore, the prepared dual-target copper-molybdenum separation inhibitor has no irritating odor and achieves a strong inhibitory effect on copper sulfide minerals even at low dosages, ensuring efficient separation of copper and molybdenum while adhering to the green industrial development concept of cleanliness and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a method for preparing and applying a dual-target copper-molybdenum separation inhibitor. Background Technology

[0002] Copper sulfide and molybdenite are difficult to separate using flotation due to their high floatability and similar surface properties, and this remains a challenge in mineral processing. For many years, the separation of copper and molybdenum in mixed copper-molybdenum concentrates has primarily relied on sodium sulfide and sodium hydrosulfide as depressants. However, these reagents are used in large quantities, have low efficiency, and generate large amounts of irritating and harmful gases during flotation. Therefore, improving the working environment and protecting the health of personnel in copper-molybdenum separation production enterprises has become a crucial issue that urgently needs to be addressed.

[0003] Mineral processing workers have conducted extensive research on copper-molybdenum separation inhibitors. Patent CN109482357A discloses a "preparation and application of a copper-molybdenum separation inhibitor," which involves the dehydration condensation of mercaptoacetic acid and monoethanolamine under sulfuric acid catalysis at 90-100°C to produce mercaptoacetamide. However, this reagent requires the use of sodium sulfide to achieve copper-molybdenum separation, thus not truly achieving an environmentally friendly alternative. Patent CN105537002A discloses "preparation and application of a flotation separation inhibitor for sulfide copper-molybdenum mixed concentrate," which uses mercaptochitosan for copper-molybdenum separation. However, the molybdenum grade of the concentrate is only 2.35%, failing to produce truly qualified molybdenum concentrate (molybdenum > 45%). Patent CN105665149B discloses "A preparation method and application of a non-molybdenum sulfide mineral flotation inhibitor." This inhibitor is suitable for copper-molybdenum mixed concentrates with low copper content (<5%), but its separation effect is poor for concentrates with copper grade >20%, and the dosage is relatively large. Patent CN110038729A discloses "A composite inhibitor for chalcopyrite flotation and a chalcopyrite flotation method." This reagent uses Cu-containing... 2+ The compound and thiomalic acid were used as a composite reagent. Although this reagent had a good inhibitory effect on chalcopyrite, it was not used for copper-molybdenum separation, and its effect on molybdenite was unclear. Patent CN110404689A discloses "A non-molybdenum sulfide ore flotation inhibitor and its application," using DL-dithiothreitol as a copper-molybdenum separation inhibitor. However, DL-dithiothreitol has low solubility and is expensive, making large-scale production difficult. Therefore, developing an environmentally friendly inhibitor with strong inhibitory ability against copper sulfide ores that can completely replace sodium sulfide, sodium hydrosulfide, sodium mercaptoacetate, and phosphoroxane is a crucial issue urgently needing to be addressed in the mineral processing field.

[0004] In view of this, it is necessary to design a method for the preparation and application of a dual-target copper-molybdenum separation inhibitor to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention aims to provide a method for preparing and applying a dual-target copper-molybdenum separation inhibitor, which has strong inhibitory ability on copper sulfide ores, achieves complete substitution of sodium sulfide and sodium hydrosulfide, and realizes safe, environmentally friendly and efficient separation of copper-molybdenum mixed concentrate.

[0006] To achieve the above objectives, the present invention provides a method for preparing a dual-target copper-molybdenum separation inhibitor, comprising the following steps: S1. Mix methanol and 4-mercaptobutyronitrile in a predetermined ratio, and adjust the pH to a predetermined range using a predetermined reagent; S2. After raising the solution obtained according to step S1 to a predetermined temperature, add a predetermined amount of dihalomethane and react for a predetermined time. After steps S3 and S2 are completed, a predetermined amount of sodium hydroxide solution is added, and the reaction is allowed to proceed for a predetermined time. After cooling, a dual-target copper-molybdenum separation inhibitor is obtained.

[0007] Further, in step S1, the predetermined ratio is a mass ratio of methanol to 4-mercaptobutyronitrile of 3 to 4:1; the predetermined reagent is sodium hydroxide; and the predetermined range for adjusting the pH is 9 to 11.

[0008] Further, in step S2, the predetermined amount is: the mass ratio of dihalomethane to the 4-mercaptobutyronitrile in step S1 is 1.0 to 1.5:1; the dihalomethane includes one of diiodomethane, dibromomethane, and dichloromethane.

[0009] Further, the predetermined amount of the sodium hydroxide solution is: the mass ratio of the sodium hydroxide solution to the 4-mercaptobutyronitrile in step S1 is 0.3 to 0.5:1; the concentration of the sodium hydroxide solution is 5 to 6 mol / L; and the predetermined reaction time is 1 to 3 hours.

[0010] Furthermore, in step S2, the predetermined temperature is 60–80°C; and the predetermined reaction time is 1–3 hours.

[0011] This invention also provides an application method for the dual-target copper-molybdenum separation inhibitor prepared by the aforementioned preparation method, comprising the following steps: Sa, Prepare a slurry of a predetermined concentration from a target copper-molybdenum mixed concentrate with a predetermined particle size; Sb. A flotation process consisting of one roughing, three scavenging, and nine cleaning processes for the slurry; the cleaned concentrate obtained from the ninth cleaning process is molybdenum concentrate. Sc. The intermediate mineral products generated during the selection and scavenging processes are sequentially returned to the previous process to form a closed loop.

[0012] Further, in step Sa, the target copper-molybdenum mixed concentrate has a predetermined particle size of -0.045 mm and a content of 80-85%; the slurry has a predetermined concentration of 30-35 wt%.

[0013] Furthermore, in step Sb, the reagents used in the first roughing process include the dual-target copper-molybdenum separation inhibitor at a dosage of 1000–3000 g / t and kerosene at a dosage of 20–60 g / t.

[0014] Further, in step Sb, the reagents used in the three scavenging processes include the dual-target copper-molybdenum separation inhibitor and the kerosene; wherein, the dosage of the dual-target copper-molybdenum separation inhibitor used in scavenging I, scavenging II, and scavenging III is 800-1200 g / t, 300-700 g / t, and 300-700 g / t, respectively, and the dosage of the kerosene used is 10-30 g / t, 5-15 g / t, and 5-15 g / t, respectively.

[0015] Furthermore, in step Sb, the reagents used in the fine selection process include the dual-target copper-molybdenum separation inhibitor at a dosage of 1000-1400 g / t and the kerosene at a dosage of 2-8 g / t; The dosages of the dual-target copper-molybdenum separation inhibitor used in Selective II, Selective III, Selective IV, Selective V, Selective VI, Selective VII, Selective VIII, and Selective IX are 400–800 g / t, 300–700 g / t, 300–700 g / t, 300–700 g / t, 300–700 g / t, 200–600 g / t, and 100–500 g / t, respectively.

[0016] The beneficial effects of this invention are: 1. This invention provides a method for preparing a dual-target copper-molybdenum separation inhibitor. The method involves mixing methanol and 4-mercaptobutyronitrile and catalyzing under alkaline conditions, followed by heating and the addition of dihalomethane for further reaction. The resulting inhibitor possesses two -SH nonpolar groups and two -COONa polar groups. The two -SH groups exhibit polydentate coordination effects, enabling strong adsorption onto the surface of copper sulfide minerals. Simultaneously, the two -COONa groups enhance the hydrophilicity of copper sulfide minerals. Compared to ordinary inhibitors with only one -SH and one -COONa group, this method significantly improves the difference in surface properties between molybdenite and copper sulfide minerals, thereby achieving highly efficient separation. Furthermore, this dual-target copper-molybdenum separation inhibitor has no irritating odor and achieves highly efficient copper-molybdenum separation without the need for sodium sulfide / sodium hydrosulfide, thus ensuring efficient separation while adhering to the green industrial development concept of clean and environmentally friendly practices.

[0017] 2. The application method of the dual-target copper-molybdenum separation inhibitor provided by this invention has a stronger selective adsorption capacity for copper sulfide compared with agents containing a single mineralophilic polar group (-SH). Therefore, it can achieve a strong inhibition effect on copper sulfide minerals with low dosage, and is low in cost and conducive to industrial promotion. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the application method of a dual-target copper-molybdenum separation inhibitor provided in Example 1.

[0019] Figure 2 This is a schematic diagram of a copper-molybdenum separation flotation process provided in Comparative Example 1. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0022] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] A method for preparing a dual-target copper-molybdenum separation inhibitor includes the following steps: S1. Methanol and 4-mercaptobutyronitrile are mixed in a predetermined ratio, and the pH is adjusted to a predetermined range using sodium hydroxide; the predetermined ratio is a mass ratio of methanol to 4-mercaptobutyronitrile of 3 to 4:1. S2. After raising the solution obtained according to step S1 to 60-80°C, add a predetermined amount of dihalomethane and react for 1-3 hours. After steps S3 and S2 are completed, a sodium hydroxide solution with a concentration of 5-6 mol / L is added, and the reaction is carried out for 1-3 hours. After cooling, a dual-target copper-molybdenum separation inhibitor is obtained.

[0024] This configuration yields an inhibitor with two -SH nonpolar groups and two -COONa polar groups. The two -SH groups exhibit polydentate coordination effects, enabling strong adsorption onto the surface of copper sulfide minerals. Simultaneously, the two -COONa groups enhance the hydrophilicity of copper sulfide minerals. Compared to conventional inhibitors with only one -SH and one -COONa group, this significantly improves the surface property differences between molybdenite and copper sulfide minerals, thus achieving highly efficient separation. Furthermore, this dual-target copper-molybdenum separation inhibitor has no irritating odor and achieves efficient copper-molybdenum separation without the need for sodium sulfide / sodium hydrosulfide.

[0025] Specifically, in some embodiments of the present invention, in step S1, the predetermined range of pH is adjusted to 9 to 11.

[0026] This setup catalyzes methanol and 4-mercaptobutyronitrile, facilitating their subsequent reaction with dihalomethanes; simultaneously, the use of NaOH to adjust the pH also contributes to the subsequent hydrolysis reaction.

[0027] Specifically, in some embodiments of the present invention, in step S2, the predetermined amount is: the mass ratio of dihalomethane to the 4-mercaptobutyronitrile in step S1 is 1.0 to 1.5:1; the dihalomethane includes one of diiodomethane, dibromomethane, and dichloromethane; preferably, the dihalomethane is diiodomethane.

[0028] With this setup, substances containing dithiol groups are generated under the action of dihalomethanes. The two -SH groups have a multidentate coordination effect and can be strongly adsorbed on the surface of copper sulfide minerals, which is beneficial for the subsequent flotation process.

[0029] Specifically, in some embodiments of the present invention, in step S3, the predetermined amount is: the mass ratio of sodium hydroxide solution to the 4-mercaptobutyronitrile in step S1 is 0.3 to 0.5:1.

[0030] This setup allows for a hydrolysis reaction under sodium hydroxide, forming two -COONa polar groups, which in turn enables copper sulfide minerals to exhibit stronger hydrophilicity during subsequent flotation processes.

[0031] This invention provides a method for applying a dual-target copper-molybdenum separation inhibitor, characterized by comprising the following steps: Sa, the target copper-molybdenum mixed concentrate with a particle size of -0.045mm accounting for 80-85% is prepared into a slurry with a concentration of 30-35wt%; Sb. A flotation process consisting of one roughing, three scavenging, and nine cleaning processes for the slurry; the cleaned concentrate obtained from the ninth cleaning process is molybdenum concentrate. Sc. The intermediate mineral products generated during the selection and scavenging processes are sequentially returned to the previous process to form a closed loop.

[0032] Specifically, in some embodiments of the present invention, in step Sb, the reagents used in the first coarse selection include the dual-target copper-molybdenum separation inhibitor at a dosage of 1000-3000 g / t and kerosene at a dosage of 20-60 g / t.

[0033] Specifically, in some embodiments of the present invention, in step Sb, the reagents used in the three scavenging processes include the dual-target copper-molybdenum separation inhibitor and the kerosene; wherein, the dosage of the dual-target copper-molybdenum separation inhibitor used in scavenging I, scavenging II, and scavenging III are 800-1200 g / t, 300-700 g / t, and 300-700 g / t, respectively, and the dosage of the kerosene used are 10-30 g / t, 5-15 g / t, and 5-15 g / t, respectively.

[0034] Specifically, in some embodiments of the present invention, in step Sb, the reagents used in the selection process include the dual-target copper-molybdenum separation inhibitor at a dosage of 1000-1400 g / t and the kerosene at a dosage of 2-8 g / t; The dosages of the dual-target copper-molybdenum separation inhibitor used in Selective II, Selective III, Selective IV, Selective V, Selective VI, Selective VII, Selective VIII, and Selective IX are 400–800 g / t, 300–700 g / t, 300–700 g / t, 300–700 g / t, 300–700 g / t, 200–600 g / t, and 100–500 g / t, respectively.

[0035] This design, compared to reagents containing a single mineralophilic polar group (-SH), provides a dual-target copper-molybdenum separation inhibitor with a stronger selective adsorption capacity for copper sulfide, thus achieving a strong inhibitory effect on copper sulfide minerals even with low dosage. Furthermore, this prepared dual-target copper-molybdenum separation inhibitor has no irritating odor and achieves efficient copper-molybdenum separation without the need for sodium sulfide / sodium hydrosulfide, thereby ensuring efficient separation of copper and molybdenum while adhering to the green industrial development concept of cleanliness and environmental protection.

[0036] The following describes the working principle of the preparation and application method of the dual-target copper-molybdenum separation inhibitor provided by the present invention: Example 1 This embodiment provides a method for preparing and applying a dual-target copper-molybdenum separation inhibitor, including the following steps: S1. Add 80g of methanol and 20g of 4-mercaptobutadiene nitrile to the reactor, and add 1.5g of sodium hydroxide to adjust the pH to 10.6. Turn on the power to the reactor and start heating. S2. When the temperature inside the reactor rises to 70°C, add 30g of diiodomethane and react for 2 hours. After step S3 and S2, weigh 8g of sodium hydroxide and prepare a sodium hydroxide solution with a concentration of 6mol / L, add it to the solution, and continue to react at 70℃ for 100min. After the reaction is completed, the solution is slowly cooled to obtain a light yellow liquid, which is the dual-target copper-molybdenum separation inhibitor. This embodiment also provides an application method for the dual-target copper-molybdenum separation inhibitor prepared according to the above method, such as... Figure 1 As shown, it includes the following steps: This embodiment uses a porphyry copper-molybdenum mixed concentrate as the research object. The copper grade in the mixed concentrate is 20.87%, and the molybdenum grade is 2.42%. The primary copper sulfide content is 45.23%, the secondary copper sulfide content is 50.74%, and the copper oxide content is 4.03%. The molybdenum sulfide content is 91.74%, and the molybdenum oxide content is 8.26%. The specific composition is shown in Tables 1 and 2.

[0037] Table 1. Results of copper phase analysis in mixed concentrate Table 2. Molybdenum phase analysis results of mixed concentrate This embodiment also provides an application method for the dual-target copper-molybdenum separation inhibitor prepared in this embodiment, including the following steps: Sa, collect the underflow product from the thickener of the copper-molybdenum mixed concentrate and prepare it into a slurry with a concentration of 30wt%; Sb, a flotation process involving one roughing and three scavenging stages for the slurry; The reagents used in the first roughing process include the dual-target copper-molybdenum separation inhibitor at a dosage of 2000 g / t and kerosene at a dosage of 40 g / t. The reagents used in the three scavenging processes include the dual-target copper-molybdenum separation inhibitor and the kerosene; wherein, the dosage of the dual-target copper-molybdenum separation inhibitor used in scavenging I, scavenging II, and scavenging III is 1000 g / t, 500 g / t, and 500 g / t, respectively, and the dosage of the kerosene used is 20 g / t, 10 g / t, and 10 g / t, respectively; Sc. The rough concentrate obtained in the flotation process is regrinded until the content of particles with a diameter of -0.045 mm accounts for 80%, and then subjected to a flotation process of nine cleaning steps. The cleaned concentrate obtained in the ninth cleaning step is molybdenum concentrate. The reagents used in the fine selection process I include the dual-target copper-molybdenum separation inhibitor at a dosage of 1200 g / t and kerosene at a dosage of 5 g / t; The dosages of the dual-target copper-molybdenum separation inhibitor used in Selective Process II, Selective Process III, Selective Process IV, Selective Process V, Selective Process VI, Selective Process VII, Selective Process VIII, and Selective Process IX are 600 g / t, 500 g / t, 500 g / t, 500 g / t, 500 g / t, 500 g / t, 400 g / t, and 300 g / t, respectively. During the Sd process, the middlings products generated from each operation are sequentially returned to the previous operation, forming a closed loop.

[0038] The final copper-molybdenum separation test results are shown in Table 3. In this example, under the condition of a total dosage of 9 kg / t, a molybdenum concentrate with a molybdenum grade of 48.36% and a copper content of 1.30% can be obtained, and the molybdenum recovery rate of the copper-molybdenum separation operation is 91.88%.

[0039] Table 3 Results of copper-molybdenum separation test in Example 1 Comparative Example 1 Comparative Example 1 provides a preparative flotation method for copper-molybdenum separation. The difference between Comparative Example 1 and Example 1 lies in the use of a different depressant throughout the flotation process. Comparative Example 1 uses sodium hydrosulfide as the depressant, and the total amount of sodium hydrosulfide used in the entire process is 30 kg / t. Specific dosage parameters and experimental procedures are detailed below. Figure 2 As shown in the figure. The remaining steps are the same as in Example 1, and will not be repeated here. The specific experimental results are shown in Table 4.

[0040] Table 4. Results of copper-molybdenum separation experiments using sodium hydrosulfide as an inhibitor (dosage: 30 kg / t) Comparative Example 2 Comparative Example 2 provides a flotation method for the separation of copper and molybdenum. The difference between Comparative Example 2 and Example 1 lies in the use of a different depressant throughout the flotation process. Sodium hydrosulfide was used as the depressant in Comparative Example 2. All other steps and process parameters were the same as in Example 1 and will not be repeated here. Specific experimental results are shown in Table 5.

[0041] Table 5. Results of copper-molybdenum separation experiments using sodium hydrosulfide as an inhibitor (dosage: 9 kg / t) As shown in Tables 4 and 5, using conventional sodium hydrosulfide as an inhibitor for copper-molybdenum separation requires a total dosage of 30 kg / t to obtain a molybdenum concentrate with a molybdenum grade of 47.53% and a copper content of 1.41%, achieving a molybdenum recovery rate of 92.24%. Using conventional sodium hydrosulfide as an inhibitor at a total dosage of 9 kg / t, with the same reagent addition amounts as in Example 1, the obtained molybdenum concentrate had a molybdenum grade of only 24.64% and a copper content as high as 8.96%, failing to produce molybdenum concentrate that meets market requirements.

[0042] A comparison of the copper-molybdenum separation test results obtained in Example 1 and Comparative Examples 1-2 shows that the inhibitor prepared by the method of this invention, at a dosage of 9 kg / t, can achieve efficient separation of copper-molybdenum minerals without the addition of any other auxiliary inhibitors, yielding molybdenum concentrate with a molybdenum grade greater than 45%. This is comparable to the effect achieved by using sodium hydrosulfide at a dosage of 30 kg / t in the copper-molybdenum separation test. Therefore, this reagent has the characteristics of low dosage, high selectivity, safety, and environmental friendliness, enabling precise sorting and efficient, environmentally friendly recovery of copper-molybdenum minerals.

[0043] In summary, this invention provides a method for preparing a dual-target copper-molybdenum separation inhibitor. The method involves mixing methanol and 4-mercaptobutyronitrile and catalyzing under alkaline conditions, followed by heating and the addition of dihalomethane for further reaction, and finally hydrolysis. The resulting inhibitor possesses two -SH nonpolar groups and two -COONa polar groups. The two -SH groups exhibit polydentate coordination effects, enabling strong adsorption onto the surface of copper sulfide minerals. Simultaneously, the two -COONa groups enhance the hydrophilicity of copper sulfide minerals. Compared to ordinary inhibitors with only one -SH and one -COONa group, this method significantly improves the difference in surface properties between molybdenite and copper sulfide minerals, thereby achieving highly efficient separation of these minerals. Furthermore, this prepared dual-target copper-molybdenum separation inhibitor has no irritating odor and achieves highly efficient copper-molybdenum separation without the need for sodium sulfide / sodium hydrosulfide, thus ensuring efficient separation of copper and molybdenum while adhering to the green industrial development concept of clean and environmentally friendly practices. Furthermore, compared with reagents containing a single mineralophilic polar group (-SH), the dual-target copper-molybdenum separation inhibitor provided by this invention has a stronger selective adsorption capacity for copper sulfide, thus achieving a strong inhibitory effect on copper sulfide minerals with low dosage, low cost, and is conducive to industrial promotion.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a dual-target copper-molybdenum separation inhibitor, characterized in that, Includes the following steps: S1. Mix methanol and 4-mercaptobutyronitrile in a predetermined ratio, and adjust the pH to 9-11 using a predetermined reagent; S2. After raising the solution obtained according to step S1 to a predetermined temperature, add a predetermined amount of dihalomethane and react for a predetermined time. After steps S3 and S2 are completed, a predetermined amount of sodium hydroxide solution is added, and the reaction is allowed to proceed for a predetermined time. After cooling, a dual-target copper-molybdenum separation inhibitor is obtained.

2. The preparation method of the dual-target copper-molybdenum separation inhibitor according to claim 1, characterized in that: In step S1, the predetermined ratio is a mass ratio of methanol to 4-mercaptobutyronitrile of 3 to 4:1; the predetermined reagent is sodium hydroxide.

3. The preparation method of the dual-target copper-molybdenum separation inhibitor according to claim 2, characterized in that: In step S2, the predetermined amount is: the mass ratio of dihalomethane to the 4-mercaptobutyronitrile in step S1 is 1.0 to 1.5:1; the dihalomethane includes one of diiodomethane, dibromomethane, and dichloromethane.

4. The preparation method of the dual-target copper-molybdenum separation inhibitor according to claim 1, characterized in that: In step S3, the predetermined amount of sodium hydroxide solution is: the mass ratio of sodium hydroxide solution to 4-mercaptobutyronitrile in step S1 is 0.3 to 0.5:1; the concentration of sodium hydroxide solution is 5 to 6 mol / L; and the predetermined reaction time is 1 to 3 hours.

5. The preparation method of the dual-target copper-molybdenum separation inhibitor according to claim 1, characterized in that: In step S2, the predetermined temperature is 60-80°C; the predetermined reaction time is 1-3 hours.

6. A method for applying the dual-target copper-molybdenum separation inhibitor prepared by the preparation method according to any one of claims 1 to 5, characterized in that, Includes the following steps: Sa, Prepare a slurry of a predetermined concentration from a target copper-molybdenum mixed concentrate with a predetermined particle size; Sb. A flotation process consisting of one roughing, three scavenging, and nine cleaning processes for the slurry; the cleaned concentrate obtained from the ninth cleaning process is molybdenum concentrate. Sc. The intermediate mineral products generated during the selection and scavenging processes are sequentially returned to the previous process to form a closed loop.

7. The application method of the dual-target copper-molybdenum separation inhibitor according to claim 6, characterized in that: In step Sa, the target copper-molybdenum mixed concentrate has a predetermined particle size of -0.045 mm and a content of 80-85%; the slurry has a predetermined concentration of 30-35 wt%.

8. The application method of the dual-target copper-molybdenum separation inhibitor according to claim 6, characterized in that: In step Sb, the reagents used in the first roughing process include the dual-target copper-molybdenum separation inhibitor at a dosage of 1000-3000 g / t and kerosene at a dosage of 20-60 g / t.

9. The application method of the dual-target copper-molybdenum separation inhibitor according to claim 8, characterized in that: In step Sb, the reagents used in the three scavenging processes include the dual-target copper-molybdenum separation inhibitor and the kerosene; wherein, the dosage of the dual-target copper-molybdenum separation inhibitor used in scavenging I, scavenging II, and scavenging III is 800-1200 g / t, 300-700 g / t, and 300-700 g / t, respectively, and the dosage of the kerosene used is 10-30 g / t, 5-15 g / t, and 5-15 g / t, respectively.

10. The application method of the dual-target copper-molybdenum separation inhibitor according to claim 9, characterized in that: In step Sb, the reagents used in refining I include the dual-target copper-molybdenum separation inhibitor at a dosage of 1000-1400 g / t and the kerosene at a dosage of 2-8 g / t; the dosages of the dual-target copper-molybdenum separation inhibitor used in refining II, refining III, refining IV, refining V, refining VI, refining VII, refining VIII, and refining IX are 400-800 g / t, 300-700 g / t, 300-700 g / t, 300-700 g / t, 300-700 g / t, 200-600 g / t, and 100-500 g / t, respectively.

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