A method for stepwise magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore

Abstract

The invention discloses a method for stepwise magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore. The method for stepwise magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore includes pre-treatment, first-stage separation, second-stage separation, grinding, third-stage separation, and fourth-stage separation steps. Based on the floatability and dissemination characteristics differences of layered easily floatable magnesium silicate minerals such as talc, by controlling the floatability of talc stepwise in the technological process, the invention not only avoids the loss of copper and molybdenum minerals caused by the traditional pre-floating talc process, but also solves the problems of high reagent consumption and simultaneous inhibition of target metals caused by forcibly inhibiting talc with extremely good floatability in the traditional process, and realizes the efficient separation of high-talc skarn-type copper-molybdenum ore.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgy, and particularly relates to a method for stepwise magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore. Background Art

[0002] Copper-molybdenum resources are widely used in military, electrical, metallurgical, aerospace and other fields, and are irreplaceable metal resources for the development of the national economy. Skarn-type copper ore and associated molybdenum resources are important raw material sources. However, due to special geological mineralization, it is often accompanied by complex ore properties such as easily floatable magnesium silicate minerals such as high-talc and serpentine. Magnesium minerals are easily slime-forming during the grinding process, and their floatability is similar to that of molybdenite. The efficient flotation separation of talc-type copper-molybdenum ore is a difficult problem in modern mineral processing technology and urgently needs to be solved.

[0003] The metal minerals in talc-type copper-molybdenum ore are mainly chalcopyrite, chalcocite, molybdenite and pyrite, and the gangue minerals are mainly talc, serpentine, quartz, biotite, muscovite, chlorite, tremolite, hornblende, diopside, epidote, potassium feldspar, plagioclase, etc. Talc, serpentine and biotite have a flaky structure and good natural floatability. During the grinding and flotation process, it is easy to form ore slime covering, mechanical entrainment and competitive adsorption of reagents, which bring many adverse effects to the recovery of copper minerals. In addition, since talc and molybdenite are "equi-floatable" minerals, and the amount of easily floatable magnesium minerals is hundreds or thousands of times that of molybdenum minerals, the conventional separation efficiency is not enough to achieve the efficient recovery of molybdenum minerals. And when molybdenum mainly exists as an associated metal, it is almost impossible to separate a single molybdenum concentrate product. At present, for mines treating talc-containing molybdenum ore, the traditional process usually adopts the separation methods of "preliminary magnesium removal from raw ore + magnesium inhibition and molybdenum flotation" and "magnesium inhibition and molybdenum flotation of whole pulp of raw ore", and this method mainly treats single molybdenum ore with a relatively high molybdenum grade in the raw ore. And it is difficult to avoid the premature loss of molybdenum and synchronous inhibition during the preliminary magnesium removal and magnesium inhibition, resulting in low molybdenum recovery. When copper is the main metal and molybdenum is the associated metal, in order to ensure the quality of copper concentrate, strong inhibitors such as sodium carboxymethylcellulose are usually used in production to strongly interfere with talc. During the process, it is difficult to recover the molybdenum minerals due to synchronous inhibition, and the copper recovery rate is also affected. Therefore, the traditional beneficiation method is not suitable for treating copper ore mainly characterized by high-talc and associated molybdenum, and there are certain limitations. Therefore, it is very necessary to develop a method to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for stepwise magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore.

[0005] The purpose of the present invention is achieved as follows. The method for stepwise magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore includes the steps of pretreatment, first-stage separation, second-stage separation, grinding, third-stage separation, and fourth-stage separation, and specifically includes:

[0006] A. Pretreatment: Lime is added to the crushed high-talc skarn-type copper-molybdenum ore for grinding. The grinding fineness is such that -74μm accounts for 50 - 60% to obtain material a;

[0007] B. First-stage separation: Material a is added with a copper-molybdenum collector and a foaming agent at one time for one rough selection to obtain copper-molybdenum mixed rough concentrate b and copper-molybdenum mixed rough selection tailings c. A copper-molybdenum collector and a foaming agent are added to the copper-molybdenum mixed rough selection tailings c for two scavenging selections, and the scavenging foam is returned step by step;

[0008] C. Second-stage separation: Lime, a talc inhibitor, and a copper-molybdenum collector are successively added to the copper-molybdenum mixed rough concentrate b for copper-molybdenum mixed cleaning to obtain copper-molybdenum mixed cleaned concentrate d and copper-molybdenum mixed cleaning tailings e. A copper-molybdenum collector is added to the copper-molybdenum mixed cleaning tailings e for copper-molybdenum mixed scavenging cleaning to obtain copper-molybdenum mixed scavenging cleaned concentrate f and tailings g; The copper-molybdenum mixed scavenging cleaned concentrate f is returned to the copper-molybdenum mixed cleaning step; Tailings g are the final tailings 2;

[0009] D. Grinding: Lime and a talc inhibitor are successively added to the copper-molybdenum mixed cleaning tailings e for grinding. The grinding fineness is such that -74μm accounts for 80 - 90% to obtain material h;

[0010] E. Third-stage separation: A copper-molybdenum collector and a foaming agent are successively added to material h for two-stage copper-molybdenum cleaning and one-stage copper-molybdenum scavenging cleaning to obtain copper-molybdenum cleaned concentrate i;

[0011] F. Fourth-stage separation: The copper-molybdenum cleaned concentrate i is subjected to de-drugging, copper-molybdenum-magnesium separation, high-molybdenum-magnesium separation, and low-molybdenum-magnesium separation to obtain low-grade molybdenum concentrate products;

[0012] Specifically:

[0013] 1) De-drugging: Clean water is added to the copper-molybdenum cleaned concentrate i for cleaning concentration and de-drugging to obtain material j;

[0014] 2) Copper-molybdenum-magnesium separation: A copper inhibitor, neutral oil, and a foaming agent are successively added to material j for one rough selection, one scavenging selection, and two cleaning selections. The intermediate products are returned step by step. The scavenging tailings are the final copper concentrate products, and the foam of the second cleaning is the molybdenum-magnesium rough concentrate product k;

[0015] 3) High-molybdenum-magnesium separation: A molybdenum inhibitor, neutral oil, and a foaming agent are successively added to the molybdenum-magnesium rough concentrate product k for rough selection to obtain high-molybdenum-magnesium separation rough concentrate l and high-molybdenum-magnesium separation rough selection tailings m. A molybdenum inhibitor, neutral oil, and a foaming agent are successively added to the high-molybdenum-magnesium separation rough selection tailings m for scavenging to obtain high-molybdenum-magnesium separation scavenging concentrate n and high-molybdenum-magnesium separation scavenging tailings; The high-molybdenum-magnesium separation scavenging concentrate n is returned to the high-molybdenum-magnesium separation rough selection step, and the high-molybdenum-magnesium separation scavenging tailings are the final high-grade molybdenum concentrate products o;

[0016] 4) Low molybdenum-magnesium separation: Add molybdenum inhibitor and frother to the rough concentrate of high molybdenum-magnesium separation in sequence, and conduct roughing, scavenging, and cleaning once. The intermediate products are returned step by step. The cleaned foam is talc, and the scavenged tailings are the final low-grade molybdenum concentrate product.

[0017] The specific operations are as follows:

[0018] A. First-stage grinding: Add lime to the crushed ore for first-stage grinding, and the grinding fineness is 50 - 60% passing -74μm.

[0019] B. Bulk roughing of copper and molybdenum - First-stage separation of copper, molybdenum, and talc: Add copper and molybdenum collector and frother to the pulp obtained in step A in sequence, and conduct roughing once and scavenging twice. The scavenged foam is returned step by step.

[0020] C. Bulk cleaning of copper and molybdenum - Second-stage separation of copper, molybdenum, and talc: Add lime, talc inhibitor, and copper and molybdenum collector to the foam product obtained in step B in sequence, and conduct bulk cleaning once and bulk cleaning and scavenging once. The scavenged foam from cleaning is returned to the cleaning process.

[0021] D. Second-stage grinding: Add lime and talc inhibitor to the foam product obtained in step C in sequence for second-stage grinding, and the grinding fineness is 80 - 90% passing -74μm.

[0022] E. Fine cleaning of copper and molybdenum - Third-stage separation of copper, molybdenum, and talc: Add copper and molybdenum collector and frother to the pulp obtained in step D in sequence for fine cleaning of copper and molybdenum twice and fine cleaning and scavenging of copper and molybdenum once. Add lime to the foam from the first cleaning for the second cleaning. The tailings from the fine cleaning and scavenging of copper and molybdenum are returned to step C, and the intermediate products during the operation are returned step by step.

[0023] F. Drug removal before fine separation of copper, molybdenum, and magnesium: Add clear water to the foam product obtained in step E for concentration. The concentration of the concentrated product is 50 - 60%, and the overflow water is returned as return water for the front-end operation. The concentrated product enters the stirred mill for scrubbing, and the fineness of the scrubbed product is 80 - 85% passing -45μm.

[0024] G. Separation of copper - molybdenum and magnesium: Add copper inhibitor, neutral oil, and frother to the product obtained in step F in sequence, and conduct roughing once, scavenging once, and cleaning twice. The intermediate products are returned step by step. The scavenged tailings are the final copper concentrate product, and the foam from the second cleaning is the rough concentrate product of molybdenum and magnesium.

[0025] H. High molybdenum-magnesium separation: Add molybdenum inhibitor, neutral oil, and frother to the rough concentrate of molybdenum and magnesium obtained in step G in sequence, and conduct roughing once and scavenging once. The scavenged tailings are the final high-grade molybdenum concentrate product.

[0026] I. Low molybdenum - magnesium separation: Add molybdenum inhibitor and foaming agent to the rougher concentrate foam obtained in step H in sequence, and conduct one rougher separation, one scavenging separation, and one cleaning separation. Intermediate products are returned step by step. The cleaned foam is talc, and the scavenging tailings are the final low - grade molybdenum concentrate product. Steps F, G, H, and I are the four - stage separation of copper - molybdenum and talc.

[0027] Furthermore, the process conditions of the first - stage grinding in step A are adding 1000 - 1500 grams of lime per ton, the pulp pH is 9.0 - 9.5, and the grinding fineness is that - 74μm accounts for 50 - 60%.

[0028] Furthermore, for the copper - molybdenum bulk rougher separation - the first - stage separation of copper - molybdenum and talc in step B, the rougher separation process conditions are adding 20 - 30 grams of copper - molybdenum collector per ton, stirring for 2 - 3 minutes, adding 15 - 25 grams of foaming agent per ton, and stirring for 2 - 3 minutes; the mixed scavenging 1 process conditions are adding 8 - 12 grams of copper - molybdenum collector per ton, stirring for 2 - 3 minutes, adding 5 - 8 grams of foaming agent per ton, and stirring for 2 - 3 minutes; the mixed scavenging 2 process conditions are adding 4 - 6 grams of copper - molybdenum collector per ton, stirring for 2 - 3 minutes, adding 2 - 4 grams of foaming agent per ton, and stirring for 2 - 3 minutes.

[0029] Furthermore, for the copper - molybdenum bulk cleaning - the second - stage separation of copper - molybdenum and talc in step C, the mixed cleaning process conditions are adding 200 - 400 grams of lime per ton, stirring for 3 - 5 minutes, adding 50 - 100 grams of talc inhibitor per ton, stirring for 3 - 5 minutes, adding 4 - 6 grams of copper - molybdenum collector per ton, and stirring for 2 - 3 minutes; the mixed cleaning scavenging process is adding 2 - 3 grams of copper - molybdenum collector per ton, and stirring for 2 - 3 minutes;

[0030] Furthermore, the second - stage grinding process in step D is adding 100 - 200 grams of lime per ton, adding 10 - 30 grams of talc inhibitor per ton, and the grinding fineness is that - 74μm accounts for 80 - 90%.

[0031] Furthermore, for the copper - molybdenum cleaning - the third - stage separation of copper - molybdenum and talc in step E, the process conditions of the first - stage copper - molybdenum cleaning are adding 2 - 3 grams of copper - molybdenum collector per ton, stirring for 2 - 3 minutes, adding 1 - 3 grams of foaming agent per ton, and stirring for 2 - 3 minutes; the process conditions of the second - stage copper - molybdenum cleaning are adding 50 - 100 grams of lime per ton, stirring for 3 - 5 minutes; the process conditions of the copper - molybdenum cleaning scavenging are adding 1 - 2 grams of copper - molybdenum collector per ton, stirring for 2 - 3 minutes, adding 1 - 2 grams of foaming agent per ton, and stirring for 2 - 3 minutes.

[0032] Further, for the copper-molybdenum-magnesium separation in step G, the roughing process is to add 200 - 400 g / t of copper inhibitor, stir for 3 - 5 min, add 2 - 3 g / t of neutral oil, stir for 2 - 3 min, add 1 - 2 g / t of foaming agent, and stir for 2 - 3 min; the scavenging process conditions are to add 50 - 100 g / t of copper inhibitor, stir for 3 - 5 min, add 1 - 2 g / t of neutral oil, stir for 2 - 3 min, add 1 - 2 g / t of foaming agent, and stir for 2 - 3 min; the first cleaning process conditions are to add 50 - 80 g / t of copper inhibitor, stir for 3 - 5 min, add 1 - 2 g / t of foaming agent, and stir for 2 - 3 min; the second cleaning process conditions are to add 20 - 30 g / t of copper inhibitor, and stir for 3 - 5 min.

[0033] Further, for the roughing process conditions of high-molybdenum-magnesium separation in step H, add 10 - 15 g / t of molybdenum inhibitor, stir for 3 - 5 min, add 3 - 5 g / t of neutral oil, stir for 2 - 3 min, add 5 - 8 g / t of foaming agent, and stir for 2 - 3 min; the scavenging process conditions are to add 5 - 10 g / t of molybdenum inhibitor, stir for 3 - 5 min, add 2 - 4 g / t of neutral oil, stir for 2 - 3 min, add 3 - 6 g / t of foaming agent, and stir for 2 - 3 min;

[0034] Further, for the roughing process conditions of low-molybdenum-magnesium separation in step I, add 5 - 10 g / t of molybdenum inhibitor, stir for 3 - 5 min, add 3 - 6 g / t of foaming agent, and stir for 2 - 3 min; the scavenging process conditions are to add 3 - 6 g / t of molybdenum inhibitor, stir for 3 - 5 min, add 2 - 4 g / t of foaming agent, and stir for 2 - 3 min; the cleaning process conditions are to add 3 - 6 g / t of molybdenum inhibitor, stir for 3 - 5 min, add 2 - 4 g / t of foaming agent, and stir for 2 - 3 min;

[0035] Further, the copper-molybdenum collector described in steps B, C, and E is TF1#.

[0036] Further, the foaming agent described in steps B, E, and G is methyl isobutyl carbinol.

[0037] Further, the talc inhibitor described in steps C and D is fructooligosaccharides.

[0038] Further, the copper inhibitor described in step G is one or both of sodium sulfide and sodium hydrosulfide.

[0039] Further, the neutral oil described in steps G, H, and I is one or both of the emulsified products of kerosene and diesel.

[0040] Further, the foaming agent described in steps H and I is propylene glycol ether alcohol.

[0041] Further, the molybdenum inhibitor described in steps H and I is TD-3.

[0042] Further, the main components of the copper-molybdenum collector TF1# used in steps B, C, and E are a mixed product of isopropyl thiourea, ethylene glycol chloroformate, and pyridine. Among them, isopropyl thiourea (30% - 50%), ethylene glycol chloroformate (40% - 50%), and pyridine (5% - 10%).

[0043] Further, the main components of the molybdenum inhibitor TD-3 described in steps H and I are a mixed product of dextrin, sodium xanthate-based cellulose, and octylphenol polyoxyethylene ether. Among them, dextrin (30% - 40%), sodium xanthate-based cellulose (40% - 60%), and octylphenol polyoxyethylene ether (5% - 10%).

[0044] Compared with the prior art, the advantages of the present invention are as follows:

[0045] 1. In the copper-molybdenum bulk flotation process of the present invention, no talc inhibitor is added, and only the copper-molybdenum collector TF1# with relatively weak collecting performance for pyrite and talc is used to promote the premature separation of copper-molybdenum from part of the talc and a large amount of pyrite. The forward shift of separation can reduce the inhibition burden of talc and pyrite at the back end, while reducing the dosage of the inhibitor and avoiding the loss of copper-molybdenum minerals caused by excessive use of talc inhibitors and lime.

[0046] 2. The present invention sets up a flotation desliming process before the regrinding operation and uses a selective talc inhibitor with mild inhibition performance to control the floating of talc. While reducing the regrinding treatment volume, it avoids the problems of mineral separation such as ore slime covering, mechanical water entrainment, and reagent competitive adsorption during the cleaning process caused by the slimeification of a large amount of talc and other magnesian gangues. It fully intercepts the relatively well-dissociated coarse-grained "moderately floatable" talc.

[0047] 3. After regrinding, the present invention selectively inhibits the newly dissociated fine-grained "moderately floatable" talc, achieving the maximum interception of magnesian gangues such as "moderately floatable" talc of all particle sizes before the separation of the target minerals. It provides a condition guarantee for the reverse flotation separation of talc at the back end and is more adaptable to the complex embedding characteristics of magnesian gangue minerals such as talc.

[0048] 4. The present invention adopts selective collection and inhibition in the copper-molybdenum bulk flotation process. Compared with the "strong pull and strong pressure" reagent system of traditional xanthate, it is more conducive to the removal of adsorbed reagents before the separation of the copper-molybdenum-magnesium bulk concentrate, reduces the separation difficulty, and the required copper separation process is relatively short.

[0049] 5. The present invention avoids the premature loss of copper minerals through a weak inhibition flotation environment before copper-molybdenum-magnesium separation, increases the probability of copper minerals with complex dissemination characteristics entering the grinding and scrubbing operations, and is conducive to improving the copper recovery rate. Moreover, the full separation of copper minerals from magnesium minerals (such as talc and fluorine-containing mica) has obvious advantages in improving the copper grade of copper concentrate and reducing harmful impurities such as magnesium and fluorine, realizing the acquisition of high-quality copper concentrate.

[0050] 6. The present invention screens the floatability of talc through the front-end process and controls the magnesium gangue minerals such as talc with the best floatability to the subsequent copper-molybdenum-magnesium separation process, which is more conducive to the fine separation of talc from copper and molybdenum metal minerals.

[0051] 7. The present invention uses TD-1# to inhibit molybdenite, sets two molybdenum concentrate outlets, and performs stepwise molybdenum inhibition and magnesium reverse flotation by controlling the dosage of TD-1#. Avoiding mechanical entrainment caused by "less inhibition and more flotation" (less molybdenite and more talc), while maximizing the molybdenum recovery rate, separating some associated molybdenum from monomer molybdenum, and realizing the quality control of molybdenum concentrate according to the grade.

[0052] 8. The reagents used in the present invention are all conventional flotation reagents and are environmentally friendly.

[0053] Based on the floatability and dissemination characteristics differences of layered easily floatable magnesium silicate minerals such as talc, the present invention realizes the efficient separation of high-talc skarn-type copper-molybdenum ore by controlling the floatability of talc in a stepped manner in the process flow, which not only avoids the loss of copper and molybdenum minerals caused by the traditional pre-floating talc process, but also solves the problems of high reagent consumption and simultaneous inhibition of target metals caused by forcibly inhibiting talc with excellent floatability in the traditional process. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0055] The following further illustrates the present invention with reference to embodiments, but the present invention is not limited in any way. The examples described in the present invention are only descriptions of the preferred test methods of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design idea of the present invention, any variations and improvements based on the teachings of the present invention should fall within the protection scope of the present invention.

[0056] The method for stepped magnesium reduction and separation of high-talc skarn-type copper-molybdenum ore described in the present invention includes pre-treatment, first-stage separation, second-stage separation, grinding, third-stage separation, and fourth-stage separation steps, specifically including:

[0057] A. Pre-treatment: Add lime to the crushed high-talc skarn-type copper-molybdenum ore for grinding, and the grinding fineness is 50-60% of -74μm to obtain material a;

[0058] B. First-stage separation: Add material a once together with a copper-molybdenum collector and a foaming agent, conduct a single rough selection to obtain a copper-molybdenum mixed rough concentrate b and a copper-molybdenum mixed rough tailing c. Add a copper-molybdenum collector and a foaming agent to the copper-molybdenum mixed rough tailing c and conduct two scavenging operations. The scavenging foam is returned step by step.

[0059] C. Second-stage separation: Add lime, a talc inhibitor, and a copper-molybdenum collector to the copper-molybdenum mixed rough concentrate b in sequence, conduct a copper-molybdenum mixed cleaning to obtain a copper-molybdenum mixed cleaned concentrate d and a copper-molybdenum mixed cleaned tailing e. Add a copper-molybdenum collector to the copper-molybdenum mixed cleaned tailing e to conduct a copper-molybdenum mixed cleaning scavenging to obtain a copper-molybdenum mixed cleaning scavenged concentrate f and a tailing g. The copper-molybdenum mixed cleaning scavenged concentrate f is returned to the copper-molybdenum mixed cleaning step. The tailing g is the final tailing 2.

[0060] D. Grinding: Add lime and a talc inhibitor to the copper-molybdenum mixed cleaned tailing e in sequence for grinding, and the grinding fineness of -74μm accounts for 80 - 90% to obtain material h.

[0061] E. Third-stage separation: Add a copper-molybdenum collector and a foaming agent to material h in sequence, and conduct two-stage copper-molybdenum cleaning and one-stage copper-molybdenum cleaning scavenging to obtain a copper-molybdenum cleaned concentrate i.

[0062] F. Fourth-stage separation: Subject the copper-molybdenum cleaned concentrate i to de-dosing, copper-molybdenum-magnesium separation, high-molybdenum-magnesium separation, and low-molybdenum-magnesium separation to obtain a low-grade molybdenum concentrate product.

[0063] Specifically:

[0064] 1) De-dosing: Add clear water to the copper-molybdenum cleaned concentrate i for cleaning and concentration to de-dose and obtain material j.

[0065] 2) Copper-molybdenum-magnesium separation: Add a copper inhibitor, a neutral oil, and a foaming agent to material j in sequence, conduct a single rough selection, a single scavenging, and a second cleaning. The intermediate products are returned step by step. The scavenging tailing is the final copper concentrate product, and the foam of the second cleaning is the molybdenum-magnesium rough concentrate product k.

[0066] 3) High-molybdenum-magnesium separation: Add a molybdenum inhibitor, a neutral oil, and a foaming agent to the molybdenum-magnesium rough concentrate product k in sequence, conduct a rough selection to obtain a high-molybdenum-magnesium separated rough concentrate l and a high-molybdenum-magnesium separated rough tailing m. Add a molybdenum inhibitor, a neutral oil, and a foaming agent to the high-molybdenum-magnesium separated rough tailing m in sequence for scavenging to obtain a high-molybdenum-magnesium separated scavenged concentrate n and a high-molybdenum-magnesium separated scavenging tailing. The high-molybdenum-magnesium separated scavenged concentrate n is returned to the high-molybdenum-magnesium separation rough selection step, and the high-molybdenum-magnesium separated scavenging tailing is the final high-grade molybdenum concentrate product o.

[0067] 4) Low molybdenum - magnesium separation: Add a molybdenum inhibitor and a foaming agent to the rough concentrate of high molybdenum - magnesium separation in sequence, conduct rough selection, one scavenging, and one cleaning in sequence. Intermediate products are returned step by step. The cleaned foam is talc, and the scavenged tailings are the final low - grade molybdenum concentrate product.

[0068] In the two scavenging steps described in step B, a copper - molybdenum collector and a foaming agent are added to the copper - molybdenum mixed roughing tailings c for primary scavenging to obtain copper - molybdenum mixed primary scavenged ore and copper - molybdenum mixed primary scavenging tailings; the copper - molybdenum mixed primary scavenged ore is returned to the copper - molybdenum mixed roughing step; a copper - molybdenum collector and a foaming agent are added to the copper - molybdenum mixed primary scavenging tailings for secondary scavenging to obtain copper - molybdenum mixed secondary scavenged ore and final tailings 1; the copper - molybdenum mixed secondary scavenged ore is returned to the primary scavenging.

[0069] In the two - stage copper - molybdenum cleaning and one - stage copper - molybdenum cleaning sweep described in step E, a copper - molybdenum collector and a foaming agent are added to the material h for primary copper - molybdenum cleaning to obtain primary copper - molybdenum cleaned ore and primary copper - molybdenum cleaning tailings; lime is added to the primary copper - molybdenum cleaned ore for secondary copper - molybdenum cleaning to obtain copper - molybdenum cleaned ore i and secondary copper - molybdenum cleaning tailings; a copper - molybdenum collector and a foaming agent are added to the primary copper - molybdenum cleaning tailings for primary copper - molybdenum cleaning sweep to obtain primary copper - molybdenum cleaning swept ore and primary copper - molybdenum cleaning sweep tailings; the primary copper - molybdenum cleaning sweep tailings are returned to the copper - molybdenum mixed cleaning step; the primary copper - molybdenum cleaning swept ore and the secondary copper - molybdenum cleaning tailings are combined and returned to the primary copper - molybdenum cleaning step.

[0070] The copper - molybdenum collector described in steps B, C, and E is composed of isopropylthiourea, ethylene glycol chloroformate, and pyridine.

[0071] The mass ratio of the isopropylthiourea, ethylene glycol chloroformate, and pyridine is (2 - 6):(3 - 6):(0.3 - 1.2).

[0072] The molybdenum inhibitor described in step F is composed of dextrin, sodium xanthate - based cellulose, and octylphenol polyoxyethylene ether.

[0073] The mass ratio of the dextrin, sodium xanthate - based cellulose, and octylphenol polyoxyethylene ether is (2 - 5):(3 - 7):(0.3 - 1.2).

[0074] The foaming agent described in step B, step E, and step F 2) is methyl isobutyl carbinol; the foaming agent described in step F 3) and step F 4) is propylene glycol ether alcohol.

[0075] The talc inhibitor is fructooligosaccharides.

[0076] The copper inhibitor is sodium sulfide and / or sodium hydrosulfide; the neutral oil is an emulsified product of kerosene and / or diesel oil.

[0077] The following further illustrates the present invention with specific embodiments:

[0078] Example 1

[0079] A certain ore dressing plant in Henan contains 0.49% copper, 0.028% molybdenum, 13.21% magnesium oxide, and 12.42% iron. The main metal minerals are chalcopyrite, covellite, molybdenite, and pyrite. The main easily floatable magnesium silicate minerals are talc and serpentine. The above ore samples are processed through the following technological steps:

[0080] A. First-stage grinding: Add 1200 g / t of lime to the crushed ore for first-stage grinding, and the grinding fineness is 60% passing -74μm.

[0081] B. Bulk roughing of copper and molybdenum - First-stage separation of copper-molybdenum and talc: The pulp obtained in step A is subjected to one roughing and two scavenging operations. The roughing process conditions are adding 30 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 20 g / t of frother methyl isobutyl carbinol, and stirring for 3 min; the conditions for the first scavenging are adding 10 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 6 g / t of frother methyl isobutyl carbinol, and stirring for 3 min; the conditions for the second scavenging are adding 5 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 3 g / t of frother methyl isobutyl carbinol, and stirring for 3 min.

[0082] C. Bulk cleaning of copper and molybdenum - Second-stage separation of copper-molybdenum and talc: The froth product obtained in step B is subjected to one bulk cleaning and one bulk cleaning scavenging process. The bulk cleaning process conditions are adding 400 g / t of lime, stirring for 4 min, adding 100 g / t of talc depressant fructan, stirring for 5 min, adding 5 g / t of TF1#, and stirring for 3 min; the bulk cleaning scavenging process is adding 3 g / t of copper-molybdenum collector TF1#, and stirring for 3 min.

[0083] D. Second-stage grinding: Add 150 g / t of lime and 20 g / t of talc depressant fructan to the froth product of step C in sequence for second-stage grinding, and the grinding fineness is 85% passing -74μm.

[0084] E. Cleaning of copper and molybdenum - Third-stage separation of copper-molybdenum and talc: The pulp obtained in step D is subjected to two cleanings of copper and molybdenum and one cleaning scavenging of copper and molybdenum. The process conditions for the first-stage cleaning of copper and molybdenum are adding 2 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 2 g / t of frother methyl isobutyl carbinol, and stirring for 3 min; the process conditions for the second-stage cleaning of copper and molybdenum are adding 100 g / t of lime, and stirring for 4 min; the process conditions for the cleaning scavenging of copper and molybdenum are adding 2 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 2 g / t of frother methyl isobutyl carbinol, and stirring for 3 min.

[0085] F. Pre - drug removal before copper - molybdenum - magnesium separation: Add the froth product from step E to clean water for concentration by beneficiation. The concentration of the concentrated product is 55%. The overflow water is returned as return water for the front - end operation. The concentrated product enters a stirred mill for scrubbing, and the fineness of the scrubbed product is such that - 45μm accounts for 85%.

[0086] G. Copper - molybdenum - magnesium separation: Conduct one rough selection, one scavenging, and two cleanings on the product obtained in step F. The rough - selection process is as follows: add 350 g / t of sodium sulfide, stir for 5 min, add 2 g / t of emulsified kerosene, stir for 2 min, add 2 g / t of the foaming agent methyl isobutyl carbinol, and stir for 2 min. The scavenging process conditions are: add 80 g / t of sodium sulfide, stir for 5 min, add 1 g / t of emulsified kerosene, stir for 2 min, add 1 g / t of the foaming agent methyl isobutyl carbinol, and stir for 2 min. The first - cleaning process conditions are: add 60 g / t of sodium sulfide, stir for 2 min, add 1 g / t of the foaming agent methyl isobutyl carbinol, and stir for 2 min. The second - cleaning process conditions are: add 30 g / t of sodium sulfide, stir for 5 min. The intermediate products are returned step by step. The scavenging tailings are the final copper concentrate product, and the foam from the second cleaning is the molybdenum - magnesium bulk concentrate product.

[0087] H. High - molybdenum - magnesium separation: Conduct one rough selection and one scavenging on the molybdenum - magnesium bulk concentrate obtained in step G. The rough - selection process conditions are: add 15 g / t of the molybdenum inhibitor TD - 3, stir for 3 min, add 5 g / t of emulsified kerosene, stir for 2 min, add 5 g / t of the foaming agent propylene glycol ether alcohol, and stir for 2 min. The scavenging process conditions are: add 10 g / t of the molybdenum inhibitor TD - 3, stir for 3 min, add 2 g / t of emulsified kerosene, stir for 2 min, add 3 g / t of the foaming agent propylene glycol ether alcohol, and stir for 2 min. The scavenging tailings are the final high - grade molybdenum concentrate product.

[0088] I. Low - molybdenum - magnesium separation: Conduct one rough selection, one scavenging, and one cleaning on the rough - selection foam from step H. The rough - selection process conditions are: add 8 g / t of the molybdenum inhibitor TD - 3, stir for 3 min, add 5 g / t of the foaming agent propylene glycol ether alcohol, and stir for 2 min. The scavenging process conditions are: add 6 g / t of the molybdenum inhibitor TD - 3, stir for 3 min, add 3 g / t of the foaming agent propylene glycol ether alcohol, and stir for 2 - 3 min. The cleaning process conditions are: add 4 g / t of the molybdenum inhibitor TD - 3, stir for 3 min, add 2 g / t of the foaming agent propylene glycol ether alcohol, and stir for 2 min. The intermediate products are returned step by step. The cleaning foam is talc, and the scavenging tailings are the final low - grade molybdenum concentrate product.

[0089] Processing the ore using the above technological process can obtain copper concentrate with a Cu grade of 26.19% and a Cu recovery rate of 86.54%; high-molybdenum concentrate with a Mo grade of 45.37% and a Mo recovery rate of 65.24%; low-molybdenum concentrate with a Mo grade of 22.33% and a Mo recovery rate of 11.24%. The comprehensive utilization rate of refractory mineral resources is improved.

[0090] Example 2

[0091] A certain concentrator in Yunnan contains 0.56% copper, 0.018% molybdenum, 10.49% magnesium oxide, and 14.12% iron. The main metal minerals are chalcopyrite, molybdenite, and pyrite, and the main easily floatable magnesium silicate mineral is talc. The above ore sample is processed through the following technological steps:

[0092] A. First-stage grinding: Add 1500 grams / ton of lime to the crushed ore for first-stage grinding, and the grinding fineness is 55% passing -74μm.

[0093] B. Bulk roughing of copper and molybdenum - First-stage separation of copper-molybdenum and talc: The pulp obtained in step A is subjected to one roughing and two scavenging operations. The roughing process conditions are adding 30 grams / ton of copper-molybdenum collector TF1#, stirring for 3 minutes, adding 25 grams / ton of foaming agent methyl isobutyl carbinol, and stirring for 3 minutes; the conditions for the first scavenging of the mixture are adding 12 grams / ton of copper-molybdenum collector TF1#, stirring for 3 minutes, adding 8 grams / ton of foaming agent methyl isobutyl carbinol, and stirring for 3 minutes; the conditions for the second scavenging of the mixture are adding 6 grams / ton of copper-molybdenum collector TF1#, stirring for 3 minutes, adding 4 grams / ton of foaming agent methyl isobutyl carbinol, and stirring for 3 minutes.

[0094] C. Bulk cleaning of copper and molybdenum - Second-stage separation of copper-molybdenum and talc: The froth product obtained in step B is subjected to one bulk cleaning and one bulk cleaning and scavenging process. The bulk cleaning process conditions are adding 400 grams / ton of lime, stirring for 4 minutes, adding 80 grams / ton of talc inhibitor fructan, stirring for 5 minutes, adding 5 grams / ton of TF1#, and stirring for 3 minutes; the bulk cleaning and scavenging process is adding 3 grams / ton of copper-molybdenum collector TF1#, and stirring for 3 minutes;

[0095] D. Second-stage grinding: Add 200 grams / ton of lime and 15 grams / ton of talc inhibitor fructan to the froth product of step C in sequence for second-stage grinding, and the grinding fineness is 90% passing -74μm.

[0096] E. Copper-molybdenum beneficiation - Three-stage separation of copper-molybdenum and talc: The pulp obtained in step D is subjected to secondary copper-molybdenum beneficiation and primary copper-molybdenum scavenging. The process conditions for the first-stage copper-molybdenum beneficiation are adding 3 g / t of copper-molybdenum collector TF1# and stirring for 3 min, adding 2 g / t of frother methyl isobutyl carbinol and stirring for 3 min. The process conditions for the second-stage copper-molybdenum beneficiation are adding 80 g / t of lime and stirring for 4 min. The process conditions for copper-molybdenum scavenging are adding 2 g / t of copper-molybdenum collector TF1# and stirring for 3 min, adding 2 g / t of frother methyl isobutyl carbinol and stirring for 3 min.

[0097] F. Drug removal before copper-molybdenum-magnesium separation: The foam product from step E is added with clean water for beneficiation and concentration. The concentration of the concentrated product is 50%, and the overflow water is returned as the return water for the front-end operation. The concentrated product enters the agitation mill for scrubbing, and the fineness of the scrubbed product is 85% passing -45μm.

[0098] G. Copper - molybdenum-magnesium separation: The product obtained in step F is subjected to one roughing, one scavenging, and two cleanings. The roughing process is adding 400 g / t of sodium sulfide and stirring for 5 min, adding 2 g / t of emulsified kerosene and stirring for 2 min, adding 2 g / t of frother methyl isobutyl carbinol and stirring for 2 min. The process conditions for scavenging are adding 80 g / t of sodium sulfide and stirring for 5 min, adding 1 g / t of emulsified kerosene and stirring for 2 min, adding 1 g / t of frother methyl isobutyl carbinol and stirring for 2 min. The process conditions for the first cleaning are adding 50 g / t of sodium sulfide and stirring for 2 min, adding 1 g / t of frother methyl isobutyl carbinol and stirring for 2 min. The process conditions for the second cleaning are adding 30 g / t of sodium sulfide and stirring for 5 min. The intermediate products are returned step by step. The scavenging tailings are the final copper concentrate product, and the foam from the second cleaning is the molybdenum-magnesium bulk concentrate product.

[0099] H. High-molybdenum - magnesium separation: The molybdenum-magnesium bulk concentrate obtained in step G is subjected to one roughing and one scavenging. The process conditions for roughing are adding 10 g / t of molybdenum inhibitor TD-3 and stirring for 3 min, adding 4 g / t of emulsified kerosene and stirring for 2 min, adding 5 g / t of frother propylene glycol ether alcohol and stirring for 2 min. The process conditions for scavenging are adding 6 g / t of molybdenum inhibitor TD-3 and stirring for 3 min, adding 2 g / t of emulsified kerosene and stirring for 2 min, adding 3 g / t of frother propylene glycol ether alcohol and stirring for 2 min. The scavenging tailings are the final high-grade molybdenum concentrate product.

[0100] I. Low molybdenum-magnesium separation: The rougher concentrate foam from step H is subjected to one rougher, one scavenger, and one cleaner. The rougher process conditions are adding 7 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 5 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 min; the scavenger process conditions are adding 5 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 3 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 - 3 min; the cleaner process conditions are adding 3 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 2 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 min; the intermediate products are returned step by step, the cleaner foam is talc, and the scavenger tailings are the final low-grade molybdenum concentrate product.

[0101] Using the above process flow to process the ore, technical indicators of copper concentrate with Cu grade of 25.73% and Cu recovery rate of 87.93%; high-grade molybdenum concentrate with Mo grade of 46.15% and Mo recovery rate of 60.88%; low-grade molybdenum concentrate with Mo grade of 19.57% and Mo recovery rate of 12.91% can be obtained. The comprehensive utilization rate of refractory mineral resources is improved.

[0102] Example 3

[0103] A certain concentrator in Yunnan contains 0.48% copper, 0.019% molybdenum, 8.33% magnesium oxide, and 13.39% iron. The main metal minerals are chalcopyrite, chalcocite, molybdenite, and pyrite. The main easily floatable magnesium silicate minerals are talc and chlorite. The above ore sample is processed through the following technological steps:

[0104] A. First-stage grinding: Add 1300 g / t of lime to the crushed ore for first-stage grinding, and the grinding fineness is 60% passing - 74μm.

[0105] B. Copper-molybdenum bulk rougher - First-stage separation of copper-molybdenum and talc: The pulp obtained from step A is subjected to one rougher and two scavengers. The rougher process conditions are adding 25 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 20 g / t of foaming agent methyl isobutyl carbinol, and stirring for 3 min; the first scavenger process conditions are adding 9 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 6 g / t of foaming agent methyl isobutyl carbinol, and stirring for 3 min; the second scavenger process conditions are adding 5 g / t of copper-molybdenum collector TF1#, stirring for 3 min, adding 3 g / t of foaming agent methyl isobutyl carbinol, and stirring for 3 min.

[0106] C. Copper-molybdenum combined roughing - Two-stage separation of copper-molybdenum and talc: Conduct a combined roughing and a combined rough scavenging process on the froth product obtained in step B. The process conditions for the combined roughing are adding 300 g / t of lime, stirring for 4 min, adding 75 g / t of the talc inhibitor levan, stirring for 5 min, adding 4 g / t of TF1#, and stirring for 3 min; the combined rough scavenging process is adding 2 g / t of the copper-molybdenum collector TF1#, and stirring for 3 min.

[0107] D. Second-stage grinding: Add 180 g / t of lime and 20 g / t of the talc inhibitor levan to the froth product of step C in sequence for second-stage grinding, and the grinding fineness is 90% passing -74μm.

[0108] E. Copper-molybdenum cleaning - Three-stage separation of copper-molybdenum and talc: Conduct secondary copper-molybdenum cleaning and one-stage copper-molybdenum clean scavenging on the pulp obtained in step D; the process conditions for the first-stage copper-molybdenum cleaning are adding 2 g / t of the copper-molybdenum collector TF1#, stirring for 3 min, adding 1 g / t of the foaming agent methyl isobutyl carbinol, and stirring for 3 min; the process conditions for the second-stage copper-molybdenum cleaning are adding 90 g / t of lime, and stirring for 4 min; the process conditions for the copper-molybdenum clean scavenging are adding 1 g / t of the copper-molybdenum collector TF1#, stirring for 3 min, adding 1 g / t of the foaming agent methyl isobutyl carbinol, and stirring for 3 min.

[0109] F. Drug removal before copper-molybdenum-magnesium separation: Add clear water to the froth product of step E for cleaning and concentration, and the concentration of the concentrated product is 55%. The overflow water is returned as the return water for the front-end operation. The concentrated product enters the agitation mill for scrubbing, and the fineness of the scrubbed product is 85% passing -45μm.

[0110] G. Copper-molybdenum-magnesium separation: Conduct one-stage roughing, one-stage scavenging, and two-stage cleaning on the product obtained in step F. The roughing process is adding 280 g / t of sodium sulfide, stirring for 5 min, adding 2 g / t of emulsified kerosene, stirring for 2 min, adding 1 g / t of the foaming agent methyl isobutyl carbinol, and stirring for 2 min; the process conditions for the scavenging are adding 70 g / t of sodium sulfide, stirring for 5 min, adding 1 g / t of emulsified kerosene, stirring for 2 min, adding 1 g / t of the foaming agent methyl isobutyl carbinol, and stirring for 2 min; the process conditions for the first cleaning are adding 60 g / t of sodium sulfide, stirring for 2 min, adding 1 g / t of the foaming agent methyl isobutyl carbinol, and stirring for 2 min; the process conditions for the second cleaning are adding 30 g / t of sodium sulfide, and stirring for 5 min. The intermediate products are returned step by step. The scavenging tailings are the final copper concentrate product, and the foam of the second cleaning is the molybdenum-magnesium rough concentrate product.

[0111] H. High molybdenum-magnesium separation: The crude molybdenum-magnesium concentrate obtained in step G is subjected to one rough selection and one scavenging. The process conditions for rough selection are adding 12 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 3 g / t of emulsified kerosene, stirring for 2 min, adding 5 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 min; the process conditions for scavenging are adding 5 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 2 g / t of emulsified kerosene, stirring for 2 min, adding 3 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 min; the scavenging tailings are the final high-grade molybdenum concentrate product.

[0112] I. Low molybdenum-magnesium separation: The rough selection foam in step H is subjected to one rough selection, one scavenging, and one cleaning. The process conditions for rough selection are adding 8 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 5 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 min; the process conditions for scavenging are adding 4 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 3 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 - 3 min; the process conditions for cleaning are adding 3 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 2 g / t of foaming agent propylene glycol ether alcohol, and stirring for 2 min; the intermediate products are returned step by step, the cleaning foam is talc, and the scavenging tailings are the final low-grade molybdenum concentrate product.

[0113] Using the above process flow to process the ore, technical indicators can be obtained as follows: copper concentrate with Cu grade of 27.33% and Cu recovery rate of 84.07%; high molybdenum concentrate with Mo grade of 45.03% and Mo recovery rate of 62.03%; low molybdenum concentrate with Mo grade of 20.16% and Mo recovery rate of 10.68%. The comprehensive utilization rate of refractory mineral resources is improved.

Claims

1. A method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore, characterized in that: The method for stepwise magnesium reduction separation of high-talc skarn copper-molybdenum ore comprises pretreatment, one-stage separation, two-stage separation, grinding, three-stage separation, and four-stage separation steps, specifically comprising: A. Pretreatment: Add lime to the crushed high-talc skarn copper-molybdenum ore for grinding, and the grinding fineness is -74μm, accounting for 50-60%, to obtain material a; B. One-stage separation: copper-molybdenum collector and frother are added to material a once, and a roughing is performed to obtain copper-molybdenum mixed roughing ore b and copper-molybdenum mixed roughing tailings c. Copper-molybdenum collector and frother are added to copper-molybdenum mixed roughing tailings c to perform scavenging twice, and the scavenging foam is returned step by step; C. Two-stage separation: lime, talc inhibitor and copper-molybdenum collector are sequentially added to the copper-molybdenum mixed roughing ore b to carry out copper-molybdenum mixed concentration to obtain copper-molybdenum mixed concentration ore d and copper-molybdenum mixed concentration tailings e; copper-molybdenum collector is added to the copper-molybdenum mixed concentration tailings e to carry out copper-molybdenum mixed fine sweeping concentration to obtain copper-molybdenum mixed fine sweeping concentration f and tailings g; the copper-molybdenum mixed fine sweeping concentration f is returned to the copper-molybdenum mixed concentration step; the tailings g is the final tailings 2; D. Grinding: lime and talc inhibitors are added to the copper-molybdenum mixed selected tailings e in sequence for grinding, and the grinding fineness is -74μm accounting for 80-90% to obtain material h; E. Three-stage separation: copper-molybdenum collector and frother are sequentially added to material h, and copper-molybdenum concentrate is obtained by two-stage copper-molybdenum concentration and one-stage copper-molybdenum fine scavenging to obtain copper-molybdenum concentrate i; F. Four-stage separation: the copper-molybdenum concentrate i is subjected to drug removal, copper-molybdenum-magnesium separation, high-molybdenum-magnesium separation and low-molybdenum-magnesium separation to obtain a low-grade molybdenum concentrate product; Specifically: 1) Drug removal: adding clean water to the copper-molybdenum concentrated ore i to concentrate and remove the drug to obtain material j; 2) Copper-molybdenum-magnesium separation: copper inhibitor, neutral oil and frother are added to material j in sequence, and roughing, primary scavenging and secondary concentrating are carried out in sequence. The intermediate products are returned step by step. The scavenging tailings are the final copper concentrate product, and the second concentrating foam is the molybdenum-magnesium rough concentrate product k; 3) High-molybdenum-magnesium separation: molybdenum inhibitor, neutral oil and frother are sequentially added to the molybdenum-magnesium rough concentrate product k to perform roughing to obtain high-molybdenum-magnesium separation roughing ore l and high-molybdenum-magnesium separation roughing tailings m; molybdenum inhibitor, neutral oil and frother are sequentially added to the high-molybdenum-magnesium separation roughing tailings m to perform scavenging to obtain high-molybdenum-magnesium separation scavenging ore n and high-molybdenum-magnesium separation scavenging tailings; high-molybdenum-magnesium separation scavenging ore n is returned to the high-molybdenum-magnesium separation roughing step, and the high-molybdenum-magnesium separation scavenging tailings is the final high-grade molybdenum concentrate product o; 4) Low-molybdenum-magnesium separation: Molybdenum inhibitor and frother are added to the high-molybdenum-magnesium separation roughing ore l in sequence, and roughing, first scavenging and first concentrating are carried out in sequence. The intermediate products are returned step by step, the concentrating foam is talc, and the scavenging tailings are the final low-grade molybdenum concentrate products.

2. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 1, characterized in that: The two scavenging processes described in step B are to add copper-molybdenum collector and frother to the copper-molybdenum mixed roughing tailings c for primary scavenging to obtain copper-molybdenum mixed primary scavenging ore and copper-molybdenum mixed primary scavenging tailings; The copper-molybdenum mixed primary scavenging ore is returned to the copper-molybdenum mixed roughing step; A copper-molybdenum collector and a frother are added to the copper-molybdenum mixed primary scavenging tailings for secondary scavenging to obtain the copper-molybdenum mixed secondary scavenging ore and final tailings 1; the copper-molybdenum mixed secondary scavenging ore returns to the primary scavenging.

3. The method for stepwise magnesium reduction and separation of talc skarn type copper-molybdenum ore according to claim 1, characterized in that: The two-stage copper-molybdenum concentration and the primary copper-molybdenum fine scavenging described in step E are: adding copper-molybdenum collectors and frothers to material h to carry out primary copper-molybdenum concentration to obtain primary copper-molybdenum concentrated ore and primary copper-molybdenum concentrated tailings; adding lime to the primary copper-molybdenum concentrated ore to carry out secondary copper-molybdenum concentration to obtain copper-molybdenum concentrated ore i and secondary copper-molybdenum concentrated tailings; adding copper-molybdenum collectors and frothers to the primary copper-molybdenum concentrated tailings to carry out primary copper-molybdenum fine scavenging to obtain primary copper-molybdenum fine scavenging ore and primary copper-molybdenum fine scavenging tailings; the primary copper-molybdenum fine scavenging tailings are returned to the copper-molybdenum mixed concentration step; the primary copper-molybdenum fine scavenging ore and the secondary copper-molybdenum concentrated tailings are combined and returned to the primary copper-molybdenum concentration step.

4. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 1, characterized in that: The copper-molybdenum collector described in steps B, C and E is composed of isopropylthiourea, ethylene glycol chloroformate and pyridine.

5. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 4, characterized in that: The mass ratio of isopropyl thiourea, ethylene glycol chloroformate and pyridine is (2-6): (3-6): (0.3-1.2).

6. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 1, characterized in that: The molybdenum inhibitor described in step F is composed of dextrin, sodium xanthate cellulose and octylphenol polyoxyethylene ether.

7. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 6, characterized in that: The mass ratio of dextrin, sodium xanthate cellulose and octylphenol polyoxyethylene ether is (2-5): (3-7): (0.3-1.2).

8. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 1, characterized in that: The foaming agent in step B, step E and step F2) is methyl isobutyl carbinol; the foaming agent in step F3) and step F4) is propylene glycol ether alcohol.

9. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 1, characterized in that: The talc inhibitor is fructan.

10. The method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore according to claim 1, characterized in that: The copper inhibitor is sodium sulfide and / or sodium hydrosulfide; the neutral oil is an emulsified product of kerosene and / or diesel.

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