Enrichment and Recovery Methods for Talc-Serpentine Type High-Sulfur Copper-Molybdenum Ores

Abstract

This application provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore, belonging to the field of flotation, which involves crushing the raw ore and adding Cu... 2+ After grinding with sodium humate as a chelating agent, Cu is added. 2+ Sodium sulfide, CD-N4 inhibitor, collector, and F6 frother are used for the first roughing stage. The tailings are then treated with isoamyl xanthate for a second roughing stage. The roughing concentrates are combined and regrinded, then sodium sulfide, CD-N4, and ethyl thiocyanate are added for pre-cleaning. The pre-cleaning tailings are then pre-cleaned and scavenged, followed by the addition of activated carbon, lime, and ethyl thiocyanate for further cleaning and roughing. The cleaning and roughing concentrates are separated into copper and molybdenum concentrates through two closed-circuit cleaning processes. The cleaning and roughing tailings are then scavenged twice through a closed-circuit system to obtain clean scavenged tailings. Finally, the pre-cleaned and clean scavenged tailings are subjected to sulfur flotation to obtain sulfur concentrate. This application resolves the pH conflict and mutual interference between gangue and sulfur inhibition, significantly improving the concentrate grades and recoveries of copper, molybdenum, and sulfur.

Description

Technical Field

[0001] This invention relates to the field of flotation technology, specifically to a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. Background Technology

[0002] Talc-serpentine type high-sulfur copper-molybdenum deposits are complex copper, molybdenum, and sulfur symbiotic mineral resources, and their recovery and utilization are quite difficult. On the one hand, talc and serpentine are magnesian layered silicate gangues that are extremely prone to mudification. Talc has good natural floatability and is easily collected and enters the copper and molybdenum concentrates, leading to a decrease in concentrate grade and an increase in the magnesium oxide content of impurities. After serpentine mudification, it forms ultrafine particles (fine mud), which, through heterogeneous aggregation or a large amount of adsorbents, encapsulate the copper and molybdenum minerals, passivating the surface properties of sulfide minerals and hindering their interaction with collectors, thereby reducing the metal flotation recovery rate. On the other hand, the high sulfur (pyrite) characteristic causes a large amount of pyrite with good floatability to compete with copper and molybdenum minerals for floatation. The large amount of sulfur inhibitor used and the unsatisfactory inhibition effect further reduce the grade of copper and molybdenum concentrates, which is not conducive to the enrichment and recovery of copper, molybdenum, and sulfur.

[0003] Currently, the enrichment and recovery of talc-serpentine type high-sulfur copper-molybdenum ores mainly adopts flotation. The technical focus is on the research and development and application of high-efficiency inhibitors and the optimization of the mineral processing flow structure. The research and development of new high-efficiency gangue inhibitors, traditional combined gangue inhibitors, and low-dosage clean and high-efficiency sulfur inhibitors are aimed at improving the surface / interface properties of gangue, dispersing and inhibiting its flotation activity, strengthening the inhibition of pyrite floatability, and reducing the interference of gangue and sulfur on the flotation process of copper and molybdenum metal minerals. However, the inhibition of talc and serpentine tends to be in a low-alkalinity pH environment, while the inhibition of sulfur requires a high-alkalinity pH environment. There is an inherent contradiction between the two inhibition processes, and conventional reagent solutions cannot simultaneously achieve the same inhibition effect.

[0004] In recent years, some research teams have intervened in harmful metal ions in advance and adopted staged grinding and staged flotation to enhance the differences in surface hydrophobicity of metal minerals step by step, creating favorable conditions for the recovery of copper and molybdenum. However, there are drawbacks such as complex process and difficulty in industrial application, and the problem of mutual interference between talc-serpentine inhibition and pyrite inhibition processes has not been effectively solved.

[0005] In view of this, it is necessary to design a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore to solve the above problems. Summary of the Invention

[0006] In view of the technical problems existing in the background art, this application provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore, which aims to solve the technical problem that there is a pH environment contradiction and mutual interference between the inhibition of talc and serpentine and the inhibition of pyrite in the prior art, resulting in low separation efficiency of copper, molybdenum and sulfur, and difficulty in simultaneously improving concentrate grade and recovery rate.

[0007] This application provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore, including the following steps: S1. Crush the raw ore to -2mm and add Cu. 2+ Sodium humate, a chelating agent, is ground to a fineness of -0.074 mm, accounting for 65-85%. Water is added to the ground product to adjust the slurry concentration to 30-33%. S2. Add Cu to the slurry obtained in step S1. 2+ Sodium sulfide is used as a precipitant, and the pH is adjusted to 8.0-9.0. Talc and serpentine dispersion inhibitor CD-N4, collector, and frother F6 are added sequentially for the first roughing process to obtain the first roughing concentrate and the first roughing tailings. The collector includes butyl xanthate, ethyl thiocyanate, and kerosene. The frother F6 is a mixture of 2-octanol, diisopropylacetone, and diisobutylmethanol. S3. Add the collector isoamyl xanthate to the first roughing tailings and perform a second roughing to obtain the second roughing concentrate and the first tailings; S4. Combine the first rougher concentrate and the second rougher concentrate, and regrind them to a fineness of -0.037mm accounting for 75~90%; after regrinding, add Cu. 2+ Pre-selection was carried out using sodium sulfide as a precipitant, CD-N4 as a dispersion inhibitor for talc and serpentine, and ethyl thiocyanate as a collector to obtain pre-selected concentrate and pre-selected tailings. S5. Add the collector ethyl thiocyanate to the pre-cleaned tailings and perform pre-cleaning to obtain pre-cleaned concentrate and pre-cleaned tailings. The pre-cleaned concentrate is returned to the pre-cleaning operation. S6. Add activated carbon (a desiccant) and lime (a sulfur inhibitor) to the pre-selected concentrate to adjust the pH to 10.5-11.5, and add ethyl thiocyanate (a collector) to perform fine and roughing separation to obtain fine and roughing concentrate and fine and roughing tailings. S7. The fine and rough concentrates are subjected to two closed-circuit cleaning processes to obtain a copper-molybdenum mixed concentrate; lime, a sulfur inhibitor, is added during the cleaning process; S8. The tailings from the roughing and finishing processes are subjected to two closed-circuit scavenging processes to obtain scavenged tailings; ethyl thiocyanate collector is added during the scavenging process; S9. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; S10. Combine the pre-cleaned tailings and the cleaned tailings, and perform sulfur flotation to obtain sulfur concentrate and a second tailings.

[0008] As a further improvement to this application, in step S1, the Cu 2+ The dosage of the chelating agent sodium humate is 80~120g / t.

[0009] As a further improvement to this application, in step S2, the Cu 2+ The dosage of sodium sulfide as a precipitant is 200-300 g / t, the dosage of CD-N4 as a talc and serpentine dispersion inhibitor is 80-120 g / t, the dosage of butyl xanthate, ethyl thiocyanate, and kerosene as collectors is 20-40 g / t, 15-25 g / t, and 5-15 g / t, respectively, and the dosage of foaming agent F6 is 15-25 g / t. Foaming agent F6 is a mixture of the following raw materials in the indicated mass percentages: 10-20% octanol, 30-50% diisopropylacetone, and 40-50% diisobutylmethanol.

[0010] As a further improvement of this application, in step S3, the amount of isoamyl xanthate used is 5~15g / t.

[0011] As a further improvement to this application, in step S4, the Cu 2+ The dosage of sodium sulfide as a precipitant is 80~120g / t, the dosage of CD-N4 as a talc and serpentine dispersion inhibitor is 40~60g / t, and the dosage of ethyl thiocyanate as a collector is 8~12g / t. In step S5, the amount of the collector ethyl thiocyanate is 4~6 g / t; In step S6, the amount of activated carbon used as the desiccant is 150-250 g / t, the amount of lime used as the sulfur inhibitor is 300-500 g / t, and the amount of ethyl thiocyanate used as the collector is 4-6 g / t.

[0012] As a further improvement of this application, in step S7, 150~250g / t of sulfur inhibitor lime is added for the first selection, and 80~120g / t of sulfur inhibitor lime is added for the second selection; In step S8, 2-4 g / t of collector ethyl thiocyanate is added during the first fine scavenging, and 1-3 g / t of collector ethyl thiocyanate is added during the second fine scavenging.

[0013] As a further improvement of this application, in steps S2 and S4, the talc and serpentine dispersion inhibitor CD-N4 is composed of the following raw materials in the indicated mass percentages: sodium carboxymethyl starch 50-60%, guru gum 2-5%, xanthan gum 5-7%, and rock salt 40-50%. The CD-N4 is prepared by adding sodium carboxymethyl starch, guru gum, and xanthan gum sequentially to water and stirring to prepare a mixed solution with a mass concentration of 1-2%. After standing for 1-2 hours until completely dissolved, rock salt is added to the mixed solution and stirred until the solution is colorless and transparent, thus obtaining the talc and serpentine dispersion inhibitor CD-N4.

[0014] As a further improvement of this application, in step S9, the copper-molybdenum separation flotation includes: adding 100-200 g / t of activated carbon to the copper-molybdenum mixed concentrate for de-treatment, followed by adding a copper inhibitor for one roughing, five to eight cleaning and two to four scavenging; the copper inhibitor is one or more of sodium sulfide, sodium hydrosulfide and sodium mercaptoacetate.

[0015] As a further improvement of this application, in step S10, the sulfur flotation adopts a closed-loop process of one roughing, two cleaning, and two scavenging; the sulfur roughing adds 150~250g / t of copper sulfate as sulfur activator, 80~120g / t of butyl xanthate as collector, and 15~25g / t of pine oil as frother; the first sulfur scavenging adds 40~60g / t of butyl xanthate as collector, and the second sulfur scavenging adds 20~40g / t of butyl xanthate as collector.

[0016] As a further improvement of this application, the raw ore has a Cu grade of 0.2-1%, a Mo grade of 0.005-0.03%, and a S grade of 5-20%; the raw ore contains 5-20% talc, 5-30% serpentine, and 10-30% pyrite.

[0017] The beneficial effects of this application are as follows: 1. This application provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore, which involves crushing the raw ore and adding Cu... 2+ After a grinding process using sodium humate as a chelating agent, Cu is added. 2+ Sodium sulfide, a precipitant, is adjusted to a weakly alkaline condition. CD-N4 inhibitor, collector, and F6 frother are added sequentially for the first roughing stage. The tailings are then treated with isoamyl xanthate for a second roughing stage. The two roughing concentrates are combined and regrinded, then sodium sulfide, CD-N4, and ethyl thiocyanate are added for pre-cleaning. The pre-cleaning tailings are then pre-cleaned and scavenged. The pre-cleaning concentrate is then adjusted to a strongly alkaline condition with activated carbon and lime, and ethyl thiocyanate is added for further coarse and fine coarse ... This application targets high-sulfur copper-molybdenum ores containing talc and serpentine. It employs a stepwise inhibition-stage grinding-tiered tailings discharging beneficiation process. Under the combined action of effective modifiers (including inhibitors), collectors, and frothers, coarse grinding and low alkalinity inhibit gangue, while regrinding and high alkalinity inhibit sulfur (pyrite). This significantly reduces the interference of talc and serpentine on the copper-molybdenum-sulfur flotation process, avoids the secondary activation problem caused by the simultaneous inhibition of talc, serpentine, and sulfur (pyrite), improves the separation efficiency of copper and molybdenum from sulfur and argillaceous gangue, and increases the recovery rate and concentrate grade of the three valuable components: copper, molybdenum, and sulfur.

[0018] 2. This application prioritizes the mixing and flotation of copper, molybdenum, and sulfur in a low-alkalinity pulp pH environment, while enhancing the inhibition of talc and serpentine. It utilizes gangue dispersion inhibitor CD-N4 and selective frother F6 to effectively inhibit talc and serpentine and minimize gangue entrainment. This avoids the secondary activation of gangue caused by adding large amounts of lime and operating in a high-alkalinity environment, which is necessary when gangue and sulfur (pyrite) are simultaneously inhibited or sulfur (pyrite) is preferentially inhibited. Furthermore, it employs Cu... 2+ Chelating agents and Cu 2+ Precipitants are used to rationally regulate the floatability of sulfur (pyrite), thereby achieving internal control over the floatability of copper, molybdenum, and sulfur, and providing convenient conditions for the separation and flotation of copper, molybdenum, and sulfur.

[0019] 3. This application adopts a grinding scheme of coarse grinding in the main process followed by regrinding of the coarse concentrate containing copper, molybdenum and sulfur. While ensuring the full recovery of valuable components such as copper, molybdenum and sulfur in the main process, it minimizes over-grinding. This allows for the flotation separation of copper, molybdenum and sulfur from talc and serpentine at a relatively coarse grinding fineness, and the flotation separation of copper, molybdenum and sulfur from sulfur at a higher grinding fineness. This avoids the problem of interaction between talc, serpentine and sulfur (pyrite) after direct fine grinding, creating a favorable grinding environment for the flotation separation of metal gangue and metals. This provides a new technical approach for the beneficiation and enrichment of high-sulfur copper-molybdenum ores containing talc and serpentine.

[0020] 4. After completing the flotation separation of copper, molybdenum, and sulfur from talc and serpentine, this application employs reasonable reagent removal, high alkalinity inhibition, and selective collection to effectively avoid interference from talc and serpentine during metal separation, achieving highly efficient flotation separation of copper, molybdenum, and sulfur. The pre-cleaning and cleaning tailings are combined for sulfur flotation, fully recovering valuable sulfur components.

[0021] 5. This application prioritizes coarse grinding and low-alkali suppression of talc and serpentine, followed by fine grinding of the coarse concentrate and high-alkali suppression of sulfur (pyrite). Talc and serpentine are preferentially discharged. The process and reagent combination is reasonable and efficient, and valuable components such as copper, molybdenum and sulfur are fully recovered. The metal flotation efficiency is high and the process stability is strong, effectively solving the problem of efficient enrichment of high-sulfur copper-molybdenum ore containing talc-serpentine.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0024] Figure 1 A flowchart illustrating the enrichment and recovery method for talc-serpentine type high-sulfur copper-molybdenum ore provided in this application embodiment. Detailed Implementation

[0025] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0029] In talc-serpentine type high-sulfur copper-molybdenum ores, talc and serpentine are prone to mud formation. Talc has good natural floatability and easily enters the concentrate, leading to a decrease in grade and excessive magnesium oxide. After serpentine mud formation, it encapsulates the minerals and adsorbs reagents. Meanwhile, pyrite has good floatability and competes with copper-molybdenum minerals for float. Existing flotation methods mainly focus on developing efficient depressants and optimizing process flow. However, talc / serpentine inhibition requires a low-alkalinity pH environment, while pyrite inhibition requires a high-alkalinity pH environment, creating an inherent contradiction that conventional reagent solutions cannot achieve simultaneously. Process structure optimization, such as staged grinding and pre-desliming, suffers from complex processes, low efficiency, and low metal recovery rates. Although recent studies have explored early intervention of harmful metal ions and stepwise enhancement of surface hydrophobicity differences, the complex processes hinder industrial application and have not effectively solved the problem of mutual interference between talc / serpentine inhibition and pyrite inhibition.

[0030] To address the existing technical problem of pH-related environmental conflicts and mutual interference between talc and serpentine inhibition and pyrite inhibition, which leads to low separation efficiency of copper, molybdenum, and sulfur and difficulty in simultaneously improving concentrate grade and recovery rate, this application provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. Targeting talc-serpentine type high-sulfur copper-molybdenum ore, this method employs a stepwise inhibition-stage grinding-tiered tailings discharge beneficiation process. Under the combined action of effective modifiers, collectors, and frothers, coarse grinding and low-alkalinity inhibition of gangue, followed by regrinding and high-alkalinity inhibition of sulfur (pyrite), significantly reduces the interference of talc and serpentine on the copper, molybdenum, and sulfur flotation process. This avoids the secondary activation problem caused by simultaneous inhibition of talc, serpentine, and sulfur (pyrite), improving the separation efficiency of copper and molybdenum from sulfur and argillaceous gangue, and ultimately increasing the recovery rate of the three valuable components (copper, molybdenum, and sulfur) and the concentrate grade.

[0031] Please refer to Figure 1 This application provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore, comprising the following steps: S1. Crush the raw ore to -2mm and add Cu. 2+ Sodium humate, a chelating agent, is ground to a fineness of -0.074 mm, accounting for 65-85%. Water is added to the ground product to adjust the slurry concentration to 30-33%. Specifically, Cu 2+ The dosage of sodium humate as a chelating agent is 80~120g / t; S2. Add Cu to the slurry obtained in step S1. 2+ Sodium sulfide was used as a precipitant, and the pH was adjusted to 8.0-9.0. Talc and serpentine dispersion inhibitor CD-N4, collector, and frother F6 were added sequentially for the first roughing process, yielding the first roughing concentrate and the first roughing tailings. The collector included butyl xanthate, ethyl thiocyanate, and kerosene. The frother F6 was a mixture of 2-octanol, diisopropylacetone, and diisobutylmethanol. Specifically, Cu2+ The dosage of sodium sulfide as a precipitant is 200-300 g / t, the dosage of CD-N4 as a talc and serpentine dispersion inhibitor is 80-120 g / t, the dosage of butyl xanthate, ethyl thiocyanate, and kerosene as collectors is 20-40 g / t, 15-25 g / t, and 5-15 g / t, respectively, and the dosage of foaming agent F6 is 15-25 g / t. Foaming agent F6 is composed of the following raw materials in the following mass percentages: 10-20% octanol, 30-50% diisopropylacetone, and 40-50% diisobutylmethanol, which are mixed evenly in the specified proportions before being added. S3. Add the collector isoamyl xanthate to the first rougher tailings and perform a second rougher to obtain the second rougher concentrate and the first tailings. Specifically, the dosage of isoamyl xanthate is 5~15g / t; S4. Combine the first and second rougher concentrates and regrind them to a fineness of -0.037mm, with 75-90% of the concentrates being finer. After regrinding, add Cu. 2+ Pre-selection was carried out using sodium sulfide as a precipitant, CD-N4 as a dispersion inhibitor for talc and serpentine, and ethyl thiocyanate as a collector to obtain pre-selected concentrate and pre-selected tailings. Specifically, Cu 2+ The dosage of sodium sulfide as a precipitant is 80~120g / t, the dosage of CD-N4 as a talc and serpentine dispersion inhibitor is 40~60g / t, and the dosage of ethyl thiocyanate as a collector is 8~12g / t. S5. Add the collector ethyl thiocyanate to the pre-cleaning tailings for pre-cleaning to obtain pre-cleaning concentrate and pre-cleaning tailings. The pre-cleaning concentrate is returned to the pre-cleaning operation. Specifically, the dosage of the collector ethyl thiocyanate is 4~6 g / t; S6. Add activated carbon (a de-tankant) and lime (a sulfur inhibitor) to the pre-selected concentrate to adjust the pH to 10.5-11.5, and add ethyl thiocyanate (a collector) to carry out fine and rough separation to obtain fine and rough concentrate and fine and rough tailings. Specifically, the dosage of activated carbon as a desiccant is 150~250g / t, the dosage of lime as a sulfur inhibitor is 300~500g / t, and the dosage of ethyl thiocyanate as a collector is 4~6g / t. S7. The concentrate from the roughing and finishing processes is subjected to two closed-circuit cleaning processes to obtain a copper-molybdenum mixed concentrate; lime, a sulfur inhibitor, is added during the cleaning process. Specifically, 150-250 g / t of lime, a sulfur inhibitor, is added during the first flotation process, and 80-120 g / t of lime, a sulfur inhibitor, is added during the second flotation process; the tailings from the first and second flotation processes are returned to the previous flotation operation in sequence. S8. The tailings from the roughing and finishing processes are subjected to two closed-circuit scavenging processes to obtain scavenged tailings; ethyl thiocyanate collector is added during the scavenging process; Specifically, 2-4 g / t of collector ethyl thiocyanate is added in the first fine scavenging, and 1-3 g / t of collector ethyl thiocyanate is added in the second fine scavenging; the concentrates from the first and second fine scavenging are returned to the previous flotation operation in sequence. S9. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; Specifically, the copper-molybdenum separation flotation includes: adding 100-200 g / t of activated carbon to the copper-molybdenum mixed concentrate for de-removal, followed by adding a copper inhibitor for one roughing, 5-8 cleaning, and 2-4 scavenging stages; the copper inhibitor is one or more of sodium sulfide, sodium hydrosulfide, and sodium mercaptoacetate; wherein the dosage of sodium sulfide is 200-20000 g / t; the dosage of sodium hydrosulfide is 100-10000 g / t; and the dosage of sodium mercaptoacetate is 50-500 g / t. S10. Combine the pre-cleaning tailings and the cleaning tailings, and perform sulfur flotation to obtain sulfur concentrate and second tailings; Specifically, the sulfur flotation adopts a closed-circuit process consisting of one roughing, two cleaning, and two scavenging stages. For the roughing stage, 150-250 g / t of copper sulfate (sulfur activator), 80-120 g / t of butyl xanthate (collector), and 15-25 g / t of pine oil (frother) are added. For the first scavenging stage, 40-60 g / t of butyl xanthate is added, and for the second scavenging stage, 20-40 g / t of butyl xanthate is added. No reagents are added for the cleaning stage. Both the tailings from the cleaning stage and the concentrate from the scavenging stage are returned sequentially to the previous flotation operation.

[0032] This application utilizes the differences in the response of talc, serpentine, and pyrite to the pH environment of the pulp. It employs a stepwise inhibition strategy. Under coarse grinding and low alkalinity conditions, talc and serpentine are preferentially inhibited by CD-N4 dispersion inhibitor and F6 selective frother. At the same time, copper ions are controlled by sodium humate chelation and sodium sulfide precipitation to prevent pyrite from being accidentally activated, thereby achieving mixed flotation of copper, molybdenum, and sulfur and removing gangue. The mixed coarse concentrate is then regrinded and switched to a high alkalinity environment. Pyrite is used to strengthen the inhibition of pyrite, enabling efficient separation of copper, molybdenum, and sulfur. Finally, the tailings from each stage are combined and activated for sulfur beneficiation, thereby achieving the tiered separation and enrichment of copper, molybdenum, sulfur, and gangue.

[0033] Furthermore, in some embodiments, in steps S2 and S4, the talc and serpentine dispersion inhibitor CD-N4 is composed of the following raw materials in weight percentages: sodium carboxymethyl starch 50-60%, glucon 2-5%, xanthan gum 5-7%, and rock salt 40-50%; The preparation method of CD-N4 is as follows: Sodium carboxymethyl starch, guru gum, and xanthan gum are added to water in sequence and stirred to prepare a mixed solution with a mass concentration of 1~2%. After standing for 1~2 hours until completely dissolved, rock salt is added to the mixed solution and stirred evenly until the solution is colorless and transparent, thus obtaining the talc and serpentine dispersion inhibitor CD-N4.

[0034] In the technical solution of this application embodiment, the high molecular weight polysaccharides such as sodium carboxymethyl starch, glucan, and xanthan gum in CD-N4 selectively adsorb onto the surface of talc and serpentine through their polar groups such as hydroxyl and carboxyl groups, enhancing their hydrophilicity and preventing attached bubbles from floating; rock salt (sodium chloride) as an electrolyte can compress the double layer, promote the effective adsorption of polymers on the surface of gangue and inhibit the agglomeration of fine mud, thereby achieving efficient dispersion and inhibition of talc and serpentine.

[0035] Furthermore, in some embodiments, the raw ore contains 0.2-1% Cu, 0.005-0.03% Mo, and 5-20% S; the raw ore contains 5-20% talc, 5-30% serpentine, and 10-30% pyrite.

[0036] In the technical solution of this application embodiment, the talc, serpentine, and pyrite with good floatability in this type of ore interfere with each other severely, and conventional processes are difficult to achieve efficient separation of each component. This application solves the enrichment problem of this specific complex ore by step-by-step suppression and tiered tailings discharge process.

[0037] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0038] Example 1 This embodiment provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. In this embodiment, the raw ore contains 0.2-1% Cu, 0.005-0.03% Mo, and 5-20% S by mass percentage; the raw ore contains 5-20% talc, 5-30% serpentine, and 10-30% pyrite. Figure 1 As shown, the specific steps include: S1. Crush the raw ore to -2mm and add Cu. 2+ Sodium humate chelating agent 100g / t, Φ240×90mm conical ball mill is used to grind the crushed ore, the grinding fineness is -0.074mm accounting for 75%, and water is added to the grinding product to adjust the slurry concentration to 32%; S2. Add Cu to the slurry obtained in step S1. 2+Sodium sulfide 250g / t precipitant, adjust the pulp pH to 8.5, then add talc and serpentine dispersion inhibitor CD-N4 100g / t, collectors butyl xanthate 30g / t, ethyl thiocyanate 20g / t, kerosene 10g / t, and frother F6 20g / t for the first roughing stage. Figure 1 The first roughing concentrate and the first roughing tailings are obtained by roughing 1). The frother F6 is a mixture of 15% octanol, 40% diisopropylacetone and 45% diisobutylmethanol. S3. Add 10 g / t of isoamyl xanthate collector to the tailings from the first roughing process and perform a second roughing process. Figure 1 (represented as roughing 2), yielding the second roughing concentrate and the first tailings. Figure 1 (represented as tailings 1) S4. Combine the first and second rougher concentrates and regrind them to a fineness of -0.037mm (85%). Add Cu after regrinding. 2+ Pre-cleaning was carried out using sodium sulfide 100g / t as precipitant, CD-N4 50g / t as talc and serpentine dispersion inhibitor, and ethyl thiocyanate 10g / t as collector to obtain pre-cleaned concentrate and pre-cleaned tailings. S5. Add 5g / t of collector ethyl thiocyanate to the pre-cleaning tailings and carry out pre-cleaning to obtain pre-cleaning concentrate and pre-cleaning tailings. The pre-cleaning concentrate is returned to the pre-cleaning operation. S6. Add 200g / t of activated carbon as a desiccant and 400g / t of lime as a sulfur inhibitor to the pre-selected concentrate, adjust the pH value to 11, and add 5g / t of ethyl thiocyanate as a collector to carry out fine and rough separation to obtain fine and rough concentrate and fine and rough tailings. S7. The concentrate from the roughing and finishing processes is subjected to two closed-circuit cleaning processes to obtain a copper-molybdenum mixed concentrate; the first cleaning process ( Figure 1 The middle section indicates that 1) 200 g / t of sulfur inhibitor lime is added, followed by a second selection ( Figure 1 (2) Add 100g / t of lime, a sulfur inhibitor; The tailings (mid-ore) of Selected 1 and Selected 2 are returned to the previous flotation operation in sequence; S8. The tailings from the roughing and cleaning processes are subjected to two closed-circuit scavenging processes to obtain cleaned tailings; the first scavenging process ( Figure 1 The middle section indicates that the fine scavenging 1) involves adding 3 g / t of collector ethyl thiocyanate, followed by a second fine scavenging ( Figure 1 (2) Add 2g / t of collector ethyl thiocyanate; The concentrates (mid-ore) from Fine Scavenging 1 and Fine Scavenging 2 are returned to the previous flotation operation in sequence; S9. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; the copper-molybdenum separation flotation includes: adding 150 g / t of activated carbon to the copper-molybdenum mixed concentrate for de-removal, followed by adding copper inhibitor for one roughing, five cleaning and three scavenging; the copper inhibitor is 1000 g / t of sodium sulfide and 100 g / t of sodium mercaptoacetate. S10. Combine the pre-cleaning tailings and the cleaning tailings, and perform sulfur flotation to obtain sulfur concentrate and a second tailings. Figure 1 The middle part is represented as tailings 2); the sulfur flotation adopts a closed-circuit process of one roughing, two cleaning, and two scavenging; the sulfur roughing adds 200g / t of copper sulfate as sulfur activator, 100g / t of butyl xanthate as collector, and 20g / t of pine oil as frother; the first sulfur scavenging ( Figure 1 The middle part represents sulfur scavenging 1) adding 50 g / t of butyl xanthate as collector, and performing a second sulfur scavenging ( Figure 1 The text refers to sulfur scavenging 2) with the addition of 30 g / t of butyl xanthate as a collector; the first sulfur scavenging and the second sulfur scavenging ( Figure 1 The following are designated as Sulfur Refinement 1 and Sulfur Refinement 2: No reagents are added. The tailings (mid-minerals) of Sulfur Refinement 1 and 2 and the concentrates (mid-minerals) of Sulfur Scavenging 1 and 2 are returned to the previous flotation operation in sequence.

[0039] The experimental data obtained in this embodiment are shown in Table 1. The losses of copper, molybdenum and sulfur in the tailings are all low, indicating that the separation effect is excellent.

[0040] Table 1 Test Results of Example 1 Comparative Example 1 Comparative Example 1 provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. Compared with Example 1, the difference is that a conventional copper-molybdenum-sulfur mixed flotation-copper-molybdenum-sulfur sequential separation flotation process is adopted, specifically including the following steps: S1. The raw ore is crushed to -2mm, and the crushed ore is ground using a Φ240×90mm conical ball mill. The grinding fineness is -0.074mm, accounting for 75%. Water is added to the grinding product to adjust the slurry concentration to 32%. S2. Add 30g / t of collector butyl xanthate, 10g / t of kerosene and 20g / t of frother pine oil to the slurry obtained in step S1, and carry out copper-molybdenum-sulfur mixed flotation roughing to obtain mixed flotation roughing concentrate and mixed flotation roughing tailings. S3. Add 10 g / t of collector butyl xanthate and 3 g / t of kerosene to the tailings of the mixed flotation rougher, and carry out copper-molybdenum-sulfur mixed flotation scavenging to obtain mixed flotation scavenging concentrate and tailings 1; the mixed flotation scavenging concentrate is returned to the mixed flotation rougher to form a closed loop. S4. The mixed flotation roughing concentrate is regrinded to a fineness of -0.037mm (85%), and then subjected to copper-molybdenum-sulfur mixed flotation cleaning to obtain mixed flotation cleaning concentrate and mixed flotation cleaning tailings. The mixed flotation cleaning tailings are returned to the mixed flotation roughing to form a closed-loop cycle. S5. Add 200g / t of activated carbon as a desiccant and 400g / t of lime as a sulfur inhibitor to the mixed flotation concentrate, adjust the pH value to 11, and add 5g / t of ethyl thiocyanate as a collector to carry out fine and roughing separation to obtain fine and roughing concentrate and fine and roughing tailings. S6. The concentrate from the roughing and finishing processes is subjected to two closed-circuit cleaning processes to obtain a copper-molybdenum mixed concentrate; 200 g / t of sulfur inhibitor lime is added to the first cleaning process and 100 g / t of sulfur inhibitor lime is added to the second cleaning process; the tailings (mid-minerals) from the first and second cleaning processes are returned to the previous flotation operation in sequence. S7. The tailings from the roughing and cleaning processes are subjected to two closed-circuit cleaning processes to obtain the cleaned tailings; 3 g / t of collector ethyl thiocyanate is added to the cleaned tailings 1 and 2 g / t of collector ethyl thiocyanate is added to the cleaned tailings 2; the concentrates (mid-minerals) from the cleaned tailings 1 and 2 are returned to the previous flotation operation in sequence. S8. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; the copper-molybdenum separation flotation includes: adding 150 g / t of activated carbon to the copper-molybdenum mixed concentrate for de-removal, followed by adding copper inhibitor for one roughing, five cleaning and three scavenging; the copper inhibitor is 1000 g / t of sodium sulfide and 100 g / t of sodium mercaptoacetate. S9. Combine the pre-cleaning and scavenging tailings and perform sulfur flotation to obtain sulfur concentrate and tailings 2. The sulfur flotation adopts a closed-circuit process of one roughing, two cleaning, and two scavenging. For the sulfur roughing, add 200g / t of copper sulfate as sulfur activator, 100g / t of butyl xanthate as collector, and 20g / t of pine oil as frother. For sulfur scavenging 1, add 50g / t of butyl xanthate as collector, and for sulfur scavenging 2, add 30g / t of butyl xanthate as collector. No reagents are added for sulfur cleaning 1 and sulfur cleaning 2. The tailings (mid-minerals) of sulfur cleaning 1 and 2 and the concentrates (mid-minerals) of sulfur scavenging 1 and 2 are returned to the previous flotation operation in sequence.

[0041] The experimental data obtained are shown in Table 2. It can be seen that the grades and recoveries of copper, molybdenum, and sulfur concentrates decreased, and the losses of copper, molybdenum, and sulfur in the tailings were all higher than in the example, indicating that the conventional sequential separation process has poor performance due to the conflict between gangue and sulfur inhibition.

[0042] Table 2 shows the test results of Comparative Example 1. Comparative Example 2 Comparative Example 2 provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. Compared with Example 1, the difference is that it adopts a copper-molybdenum and sulfur separation-mixed concentrate copper-molybdenum separation-tailings activation and sulfur flotation process, specifically including the following steps: S1. The raw ore is crushed to -2mm, and the crushed ore is ground using a Φ240×90mm conical ball mill. The grinding fineness is -0.074mm, accounting for 75%. Water is added to the grinding product to adjust the slurry concentration to 32%. S2. Add 2000 g / t of lime (sulfur inhibitor) to the slurry obtained in step S1, adjust the pH value to 11, add 30 g / t of butyl xanthate (collector), 10 g / t of kerosene, and 20 g / t of pine oil (foaming agent) to the slurry, and carry out copper-molybdenum roughing to obtain copper-molybdenum roughing concentrate and copper-molybdenum roughing tailings. S3. Add 10 g / t of butyl xanthate collector to the copper-molybdenum roughing tailings and carry out copper-molybdenum scavenging to obtain copper-molybdenum scavenged concentrate and copper-molybdenum tailings; the copper-molybdenum scavenged concentrate is returned to the copper-molybdenum roughing operation to form a closed loop. S4. The copper-molybdenum scavenging tailings are subjected to sulfur flotation to obtain sulfur concentrate and tailings 1. The sulfur flotation adopts a closed-circuit process of one roughing, two cleaning, and two scavenging. In the sulfur roughing, 200 g / t of copper sulfate activator, 100 g / t of butyl xanthate collector, and 20 g / t of pine oil frother are added. In sulfur scavenging 1, 50 g / t of butyl xanthate collector is added, and in sulfur scavenging 2, 30 g / t of butyl xanthate collector is added. No reagents are added to sulfur cleaning 1 and sulfur cleaning 2. The tailings (mid-minerals) from sulfur cleaning 1 and 2 and the concentrates (mid-minerals) from sulfur scavenging 1 and 2 are returned to the previous flotation operation in sequence. S5. The copper-molybdenum roughing concentrate is regrinded to a fineness of -0.037mm (85%), and then subjected to copper-molybdenum mixed flotation cleaning to obtain mixed flotation cleaning concentrate and mixed flotation cleaning tailings. The mixed flotation cleaning tailings are returned to the copper-molybdenum mixed flotation roughing operation to form a closed loop. S6. The copper-molybdenum mixed flotation concentrate is cleaned to obtain copper-molybdenum mixed concentrate and tailings 2. The cleaning process consists of one roughing, two cleaning and three scavenging. The middlings of each cleaning and scavenging concentrate are returned to the previous flotation operation in sequence to form a closed loop. S7. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; the copper-molybdenum separation flotation includes: adding 150g / t of activated carbon to the copper-molybdenum mixed concentrate for de-removal, followed by adding copper inhibitor for one roughing, five cleaning and three scavenging; the copper inhibitor is 1000g / t of sodium sulfide and 100g / t of sodium mercaptoacetate.

[0043] The experimental data obtained are shown in Table 3. The process did not include pre-discharge of copper-molybdenum-sulfur mixed flotation, resulting in severe interference from talc and serpentine, and poor sorting performance.

[0044] Table 3. Test results of Comparative Example 2 Comparative Example 3 Comparative Example 3 provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. Compared with Example 1, the difference is that it adopts a conventional copper-molybdenum-sulfur separation-copper-molybdenum-talc-serpentine separation-mixed concentrate copper-molybdenum separation-tailings activation and sulfur flotation process, specifically including the following steps: S1. The raw ore is crushed to -2mm, and the crushed ore is ground using a Φ240×90mm conical ball mill. The grinding fineness is -0.074mm, accounting for 75%. Water is added to the grinding product to adjust the slurry concentration to 32%. S2. Add 2000 g / t of lime (sulfur inhibitor) to the slurry obtained in step S1, adjust the pH value to 11, add 30 g / t of butyl xanthate (collector), 10 g / t of kerosene, and 20 g / t of pine oil (foaming agent) to the slurry, and carry out copper-molybdenum roughing to obtain copper-molybdenum roughing concentrate and copper-molybdenum roughing tailings. S3. Add 10 g / t of butyl xanthate collector to the copper-molybdenum roughing tailings and carry out copper-molybdenum scavenging to obtain copper-molybdenum scavenged concentrate and copper-molybdenum tailings; the copper-molybdenum scavenged concentrate is returned to the copper-molybdenum roughing operation to form a closed loop. S4. The copper-molybdenum scavenging tailings are subjected to sulfur flotation to obtain sulfur concentrate and tailings 1. The sulfur flotation adopts a closed-circuit process of one roughing, two cleaning, and two scavenging. In the sulfur roughing, 200 g / t of copper sulfate activator, 100 g / t of butyl xanthate collector, and 20 g / t of pine oil frother are added. In sulfur scavenging 1, 50 g / t of butyl xanthate collector is added, and in sulfur scavenging 2, 30 g / t of butyl xanthate collector is added. No reagents are added to sulfur cleaning 1 and sulfur cleaning 2. The tailings (mid-minerals) from sulfur cleaning 1 and 2 and the concentrates (mid-minerals) from sulfur scavenging 1 and 2 are returned to the previous flotation operation in sequence. S5. The copper-molybdenum roughing concentrate is regrinded to a fineness of -0.037mm (85%), and then subjected to copper-molybdenum mixed flotation cleaning to obtain mixed flotation cleaning concentrate and mixed flotation cleaning tailings. The mixed flotation cleaning tailings are returned to the copper-molybdenum mixed flotation roughing operation to form a closed loop. S6. For the copper-molybdenum mixed flotation concentrate, 200 g / t of talc and serpentine dispersion inhibitor CD-N4 is added. Copper-molybdenum is separated from talc and serpentine by flotation to obtain a copper-molybdenum mixed concentrate and tailings 2. The separation flotation process of copper-molybdenum from talc and serpentine consists of one roughing, two cleaning, and three scavenging. The middlings from each cleaning and scavenging concentrate are returned to the previous flotation operation in sequence to form a closed loop. 50-100 g / t of talc and serpentine dispersion inhibitor CD-N4 is added to each cleaning operation. S7. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; the copper-molybdenum separation flotation includes: adding 150g / t of activated carbon to the copper-molybdenum mixed concentrate for de-removal, followed by adding copper inhibitor for one roughing, five cleaning and three scavenging; the copper inhibitor is 1000g / t of sodium sulfide and 100g / t of sodium mercaptoacetate.

[0045] The experimental data obtained are shown in Table 4. Although this process separates talc and serpentine separately, it does not employ staged pH control, resulting in a decrease in the grade and recovery rate of copper, molybdenum, and sulfur concentrates, indicating that the separation is incomplete.

[0046] Table 4 shows the test results of Comparative Example 3. Comparative Example 4 Comparative Example 4 provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. The difference from Example 1 is that the talc and serpentine dispersion inhibitor CD-N4 was not used in steps S2 and S4. The experimental data are shown in Table 5. It is evident that without CD-N4, talc and serpentine were not effectively inhibited, resulting in a decrease in copper concentrate grade to 20.53% and recovery rate to 75.67%; molybdenum recovery rate to 57.16%; and sulfur concentrate grade to 42.31% and recovery rate to 82.94%, all significantly worse than in the example. This indicates that the gangue inhibitor CD-N4 is crucial for improving separation performance.

[0047] Table 5 shows the test results for Comparative Example 4. Comparative Example 5 Comparative Example 5 provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. Compared with Example 1, the difference is that regrinding was not performed in step S4. The experimental data obtained are shown in Table 6. It can be seen that without regrinding, the copper and molybdenum in the rough concentrate are not fully dissociated from gangue and sulfur. Compared with the example, the recovery rate of copper and molybdenum is significantly reduced, indicating that regrinding is a key step to achieve efficient separation of copper and molybdenum from sulfur.

[0048] Table 6 shows the test results of Comparative Example 5. Comparative Example 6 Comparative Example 6 provides a method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore. The difference from Example 1 is that a conventional frother (pine oil) is used in step S2, instead of frother F6. The experimental data are shown in Table 7. After replacing F6 with a conventional frother, the grades of copper, molybdenum, and sulfur concentrates all decreased, indicating that frother F6 has better selectivity, can reduce the entrainment and flotation of easily floatable gangue such as talc, and improve concentrate quality.

[0049] Table 7 shows the test results for Comparative Example 6. It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore, characterized in that, Includes the following steps: S1. Crush the raw ore to -2mm and add Cu. 2+ Sodium humate, a chelating agent, is ground to a fineness of -0.074 mm, accounting for 65-85%. Water is added to the ground product to adjust the slurry concentration to 30-33%. S2. Add Cu to the slurry obtained in step S1. 2+ Sodium sulfide is used as a precipitant, and the pH is adjusted to 8.0-9.

0. Talc and serpentine dispersion inhibitor CD-N4, collector, and frother F6 are added sequentially for the first roughing process to obtain the first roughing concentrate and the first roughing tailings. The collector includes butyl xanthate, ethyl thiocyanate, and kerosene. The frother F6 is a mixture of 2-octanol, diisopropylacetone, and diisobutylmethanol. S3. Add the collector isoamyl xanthate to the first roughing tailings and perform a second roughing to obtain the second roughing concentrate and the first tailings; S4. Combine the first rougher concentrate and the second rougher concentrate, and regrind them to a fineness of -0.037mm accounting for 75~90%; after regrinding, add Cu. 2+ Pre-selection was carried out using sodium sulfide as a precipitant, CD-N4 as a dispersion inhibitor for talc and serpentine, and ethyl thiocyanate as a collector to obtain pre-selected concentrate and pre-selected tailings. S5. Add the collector ethyl thiocyanate to the pre-cleaned tailings and perform pre-cleaning to obtain pre-cleaned concentrate and pre-cleaned tailings. The pre-cleaned concentrate is returned to the pre-cleaning operation. S6. Add activated carbon (a desiccant) and lime (a sulfur inhibitor) to the pre-selected concentrate to adjust the pH to 10.5-11.5, and add ethyl thiocyanate (a collector) to perform fine and roughing separation to obtain fine and roughing concentrate and fine and roughing tailings. S7. The fine and rough concentrates are subjected to two closed-circuit cleaning processes to obtain a copper-molybdenum mixed concentrate; lime, a sulfur inhibitor, is added during the cleaning process; S8. The tailings from the roughing and finishing processes are subjected to two closed-circuit scavenging processes to obtain scavenged tailings; ethyl thiocyanate collector is added during the scavenging process; S9. The copper-molybdenum mixed concentrate is subjected to copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate; S10. Combine the pre-cleaned tailings and the cleaned tailings, and perform sulfur flotation to obtain sulfur concentrate and a second tailings.

2. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S1, the Cu 2+ The dosage of the chelating agent sodium humate is 80~120g / t.

3. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S2, the Cu 2+ The dosage of sodium sulfide as a precipitant is 200-300 g / t, the dosage of CD-N4 as a talc and serpentine dispersion inhibitor is 80-120 g / t, the dosage of butyl xanthate, ethyl thiocyanate, and kerosene as collectors is 20-40 g / t, 15-25 g / t, and 5-15 g / t, respectively, and the dosage of foaming agent F6 is 15-25 g / t. Foaming agent F6 is a mixture of the following raw materials in the indicated mass percentages: 10-20% octanol, 30-50% diisopropylacetone, and 40-50% diisobutylmethanol.

4. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S3, the amount of isoamyl xanthate used is 5~15g / t.

5. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S4, the Cu 2+ The dosage of sodium sulfide as a precipitant is 80~120g / t, the dosage of CD-N4 as a talc and serpentine dispersion inhibitor is 40~60g / t, and the dosage of ethyl thiocyanate as a collector is 8~12g / t. In step S5, the amount of the collector ethyl thiocyanate is 4~6 g / t; In step S6, the amount of activated carbon used as the desiccant is 150-250 g / t, the amount of lime used as the sulfur inhibitor is 300-500 g / t, and the amount of ethyl thiocyanate used as the collector is 4-6 g / t.

6. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S7, the sulfur inhibitor lime is added for the first fine selection at 150~250g / t, and the sulfur inhibitor lime is added for the second fine selection at 80~120g / t. In step S8, 2-4 g / t of collector ethyl thiocyanate is added during the first fine scavenging, and 1-3 g / t of collector ethyl thiocyanate is added during the second fine scavenging.

7. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In steps S2 and S4, the talc and serpentine dispersion inhibitor CD-N4 is composed of the following raw materials in the indicated mass percentages: sodium carboxymethyl starch 50-60%, guru gum 2-5%, xanthan gum 5-7%, and rock salt 40-50%. The CD-N4 is prepared by adding sodium carboxymethyl starch, guru gum, and xanthan gum sequentially to water and stirring to prepare a mixed solution with a mass concentration of 1-2%. After standing for 1-2 hours until completely dissolved, rock salt is added to the mixed solution and stirred until the solution is colorless and transparent, thus obtaining the talc and serpentine dispersion inhibitor CD-N4.

8. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S9, the copper-molybdenum separation flotation includes: adding 100-200 g / t of activated carbon to the copper-molybdenum mixed concentrate for de-treatment, followed by adding a copper inhibitor for one roughing, five to eight cleaning and two to four scavenging; the copper inhibitor is one or more of sodium sulfide, sodium hydrosulfide and sodium mercaptoacetate.

9. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, In step S10, the sulfur flotation adopts a closed-circuit process of one roughing, two cleaning, and two scavenging. In the sulfur roughing, 150-250 g / t of copper sulfate, 80-120 g / t of butyl xanthate, and 15-25 g / t of pine oil, are added as sulfur activator. In the first sulfur scavenging, 40-60 g / t of butyl xanthate is added as collector, and in the second sulfur scavenging, 20-40 g / t of butyl xanthate is added as collector.

10. The method for enriching and recovering talc-serpentine type high-sulfur copper-molybdenum ore according to claim 1, characterized in that, The raw ore contains 0.2-1% Cu, 0.005-0.03% Mo, and 5-20% S; it also contains 5-20% talc, 5-30% serpentine, and 10-30% pyrite.

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