Method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore

Abstract

A method for stepwise magnesium reduction and separation of high-talc skarn copper-molybdenum ore, comprising the steps of pretreatment, first-stage separation, second-stage separation, ore grinding, third-stage separation, and fourth-stage separation.

Description

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

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

[0002] Copper-molybdenum resources are widely used in military, electrical, metallurgical, aerospace and other fields, and are irreplaceable strategic metal resources for the development of national economy. Skarn type copper ore and associated molybdenum resources are important raw material sources. However, due to special geological mineralization, they are often accompanied by high-talc, serpentine and other complex mineral characteristics of easy-to-float magnesium silicate minerals. Magnesium minerals are prone to mudification during grinding, and have similar floatability to molybdenite. Efficient flotation separation of talc type copper-molybdenum ore is a modern beneficiation technical problem that needs to be solved urgently.

[0003] Metallic minerals in talc type copper-molybdenum ore mainly include chalcopyrite, chalcocite, molybdenite and pyrite, and gangue minerals mainly include talc, serpentine, quartz, biotite, muscovite, chlorite, tremolite, ordinary hornblende, diopside, epidote, potassium feldspar and anorthite. Talc, serpentine and biotite have flaky structure and good natural floatability. During the grinding and flotation process, they are prone to form mud cover, mechanical entrainment and competitive adsorption of reagents, which brings many adverse effects to copper mineral recovery. In addition, since talc and molybdenite are “equally floatable” minerals, and the amount of easy-to-float magnesium minerals is hundreds or even thousands of times that of molybdenum minerals, the conventional separation efficiency is not enough to realize efficient recovery of molybdenum minerals. When molybdenum exists as an associated metal, it is almost impossible to separate a single molybdenum concentrate product. At present, for the treatment of talc-containing molybdenum ore, the traditional process usually adopts the separation method of “preliminary magnesium removal of raw ore + magnesium inhibition for molybdenum flotation” and “whole pulp magnesium inhibition for molybdenum flotation”. This method mainly treats single molybdenum ore with high molybdenum grade in raw ore. However, it is difficult to avoid the early loss and simultaneous inhibition of molybdenum during preliminary magnesium removal and magnesium inhibition, resulting in low efficiency of 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 carboxymethyl cellulose are usually used to strongly interfere with talc in the production process. The simultaneous inhibition of molybdenum minerals makes it difficult to recover, and the copper recovery rate is also affected. Therefore, the traditional beneficiation method is not suitable for the treatment of copper ore with high talc and associated molybdenum as the main characteristics, and has certain limitations. Therefore, it is necessary to develop a method to solve the above problems. TECHNICAL SOLUTION

[0004] The purpose of the present application 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 application is achieved by the method for stepwise magnesium reduction and separation of high-talc skarn type copper-molybdenum ore, which comprises the steps of pretreatment, one-stage separation, two-stage separation, grinding, three-stage separation and four-stage separation, and specifically comprises:

[0006] A, pre-treatment: adding lime to the broken high-talc skarn type copper-molybdenum ore for grinding, the grinding fineness is 50-60% of -74 μm to obtain material a;

[0007] B, one-stage separation: adding copper-molybdenum collector and frother to the material a for one roughing to obtain copper-molybdenum mixed roughing ore b and copper-molybdenum mixed roughing tailings c, adding copper-molybdenum collector and frother to the copper-molybdenum mixed roughing tailings c for two scavenging, and the scavenging froth is returned step by step;

[0008] C, two-stage separation: adding lime, talc inhibitor and copper-molybdenum collector to the copper-molybdenum mixed roughing ore b in turn for copper-molybdenum mixed cleaning to obtain copper-molybdenum mixed cleaning ore d and copper-molybdenum mixed cleaning tailings e, adding copper-molybdenum collector to the copper-molybdenum mixed cleaning tailings e for copper-molybdenum mixed scavenging to obtain copper-molybdenum mixed scavenging ore f and tailings g; the copper-molybdenum mixed scavenging ore f is returned to the copper-molybdenum mixed cleaning step; the tailings g is final tailings 2;

[0009] D, grinding: adding lime and talc inhibitor to the copper-molybdenum mixed cleaning tailings e in turn for grinding, the grinding fineness is 80-90% of -74 μm to obtain material h;

[0010] E, three-stage separation: adding copper-molybdenum collector and frother to the material h in turn for two-stage copper-molybdenum cleaning and one-stage copper-molybdenum scavenging to obtain copper-molybdenum cleaning ore i;

[0011] F, four-stage separation: the copper-molybdenum cleaning ore i is subjected to medicine removal, copper-molybdenum magnesium separation, high-molybdenum-magnesium separation and low-molybdenum-magnesium separation to obtain low-grade molybdenum concentrate product;

[0012] Specifically:

[0013] 1) medicine removal: adding clean water to the copper-molybdenum cleaning ore i for cleaning concentration medicine removal to obtain material j;

[0014] 2) copper-molybdenum magnesium separation: adding copper inhibitor, neutral oil and frother to the material j in turn for roughing, one scavenging and two cleaning in turn, the intermediate products are returned step by step, and the scavenging tailings are the final copper concentrate product, and the froth of the second cleaning is a molybdenum-magnesium rough concentrate product k;

[0015] 3) high-molybdenum-magnesium separation: adding molybdenum inhibitor, neutral oil and frother to the molybdenum-magnesium rough concentrate product k in turn for roughing to obtain high-molybdenum-magnesium separation roughing ore l and high-molybdenum-magnesium separation roughing tailings m, adding molybdenum inhibitor, neutral oil and frother to the high-molybdenum-magnesium separation roughing tailings m in turn for scavenging to obtain high-molybdenum-magnesium separation scavenging ore n and high-molybdenum-magnesium separation scavenging tailings; the 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 are the final high-grade molybdenum concentrate product o;

[0016] 4) Low Mo-Mg separation: Molybdenum depressant and frother are added in sequence to the high Mo-Mg separation rough concentrate 1, and roughing, once scavenging and once cleaning are carried out, and the intermediate products are returned step by step, the cleaning froth is talc, and the scavenging tailings are the final low-grade molybdenum concentrate product.

[0017] The specific operation is as follows:

[0018] A, one-stage grinding: The crushed ore is added with lime for one-stage grinding, and the grinding fineness is 50-60% of -74 μm.

[0019] B, copper-molybdenum mixed roughing-copper-molybdenum and talc one-stage separation: The ore slurry obtained in step A is added with copper-molybdenum collector and frother in sequence, and once roughing and twice scavenging are carried out, and the scavenging froth is returned step by step.

[0020] C, copper-molybdenum mixed cleaning-copper-molybdenum and talc two-stage separation: The froth product obtained in step B is added with lime, talc depressant and copper-molybdenum collector in sequence, and once mixed cleaning and once mixed cleaning scavenging are carried out, and the cleaning scavenging froth is returned to cleaning.

[0021] D, two-stage grinding: The froth product of step C is added with lime and talc depressant in sequence for two-stage grinding, and the grinding fineness is 80-90% of -74 μm.

[0022] E, copper-molybdenum cleaning-copper-molybdenum and talc three-stage separation: The ore slurry obtained in step D is added with copper-molybdenum collector and frother in sequence for twice copper-molybdenum cleaning and once copper-molybdenum cleaning scavenging, the copper-molybdenum cleaning 1 froth is added with lime for copper-molybdenum cleaning 2, the copper-molybdenum cleaning scavenging tailings are returned to step C, and the intermediate products are returned step by step.

[0023] F, copper-molybdenum-magnesium fine separation pre-drug removal: The froth product of step E is added with water for concentration, the concentration product concentration is 50-60%, and the overflow water is used as the front-end operation backwater for return. The concentrated product enters the agitator mill for scrubbing, and the scrubbing product fineness is 80-85% of -45 μm.

[0024] G, copper-molybdenum-magnesium separation: The product obtained in step F is added with copper depressant, neutral oil and frother in sequence for once roughing, once scavenging and twice cleaning. The intermediate products are returned step by step, the scavenging tailings are the final copper concentrate product, and the second cleaning froth is the molybdenum-magnesium rough concentrate product.

[0025] H, high Mo-Mg separation: The molybdenum-magnesium rough concentrate obtained in step G is added with molybdenum depressant, neutral oil and frother in sequence for once roughing and once scavenging. The scavenging tailings are the final high-grade molybdenum concentrate product.

[0026] I. Low molybdenum-magnesium separation: the rough selection foam of step H is sequentially added with a molybdenum inhibitor and a frother to perform a rough selection, a scavenging selection and a concentration selection. The intermediate products are returned step by step, and the concentration foam is a final low-grade molybdenum concentrate product, and the scavenging tailings are a final low-grade molybdenum concentrate product. Steps F, G, H and I are four-stage separation of copper-molybdenum and talc.

[0027] Further, the one-stage grinding process condition of step A is that 1000-1500 g / t of lime is added, the pulp PH is 9.0-9.5, and the grinding fineness is 50-60% of -74 μm.

[0028] Further, the copper-molybdenum mixed rough selection-copper-molybdenum and talc one-stage separation of step B has the following process conditions: 20-30 g / t of copper-molybdenum collector is added, stirring for 2-3 min, 15-25 g / t of frother is added, stirring for 2-3 min; the mixed scavenging selection 1 process condition is that 8-12 g / t of copper-molybdenum collector is added, stirring for 2-3 min, 5-8 g / t of frother is added, stirring for 2-3 min; the mixed scavenging selection 2 process condition is that 4-6 g / t of copper-molybdenum collector is added, stirring for 2-3 min, 2-4 g / t of frother is added, stirring for 2-3 min.

[0029] Further, the copper-molybdenum mixed concentration-copper-molybdenum and talc two-stage separation of step C has the following process conditions: 200-400 g / t of lime is added, stirring for 3-5 min, 50-100 g / t of talc inhibitor is added, stirring for 3-5 min, 4-6 g / t of copper-molybdenum collector is added, stirring for 2-3 min; the mixed concentration scavenging process condition is that 2-3 g / t of copper-molybdenum collector is added, stirring for 2-3 min;

[0030] Further, the two-stage grinding process of step D is that 100-200 g / t of lime is added, 10-30 g / t of talc inhibitor is added, and the grinding fineness is 80-90% of -74 μm.

[0031] Further, the copper-molybdenum concentration-copper-molybdenum and talc three-stage separation of step E has the following process conditions: the copper-molybdenum concentration 1 process condition is that 2-3 g / t of copper-molybdenum collector is added, stirring for 2-3 min, 1-3 g / t of frother is added, stirring for 2-3 min; the copper-molybdenum concentration 2 process condition is that 50-100 g / t of lime is added, stirring for 3-5 min; the copper-molybdenum scavenging process condition is that 1-2 g / t of copper-molybdenum collector is added, stirring for 2-3 min, 1-2 g / t of frother is added, stirring for 2-3 min.

[0032] Further, the copper-molybdenum magnesium separation in step G is a roughing process of adding copper depressant 200-400 g / t, stirring for 3-5 min, adding neutral oil 2-3 g / t, stirring for 2-3 min, adding frother 1-2 g / t, stirring for 2-3 min; the scavenging process conditions are adding copper depressant 50-100 g / t, stirring for 3-5 min, adding neutral oil 1-2 g / t, stirring for 2-3 min, adding frother 1-2 g / t, stirring for 2-3 min; the process conditions of cleaning 1 are adding copper depressant 50-80 g / t, stirring for 3-5 min, adding frother 1-2 g / t, stirring for 2-3 min; the process conditions of cleaning 2 are adding copper depressant 20-30 g / t, stirring for 3-5 min.

[0033] Further, the high molybdenum-magnesium separation roughing process conditions in step H are adding molybdenum depressant 10-15 g / t, stirring for 3-5 min, adding neutral oil 3-5 g / t, stirring for 2-3 min, adding frother 5-8 g / t, stirring for 2-3 min; the scavenging process conditions are adding molybdenum depressant 5-10 g / t, stirring for 3-5 min, adding neutral oil 2-4 g / t, stirring for 2-3 min, adding frother 3-6 g / t, stirring for 2-3 min;

[0034] Further, the low molybdenum-magnesium separation roughing process conditions in step I are adding molybdenum depressant 5-10 g / t, stirring for 3-5 min, adding frother 3-6 g / t, stirring for 2-3 min; the scavenging process conditions are adding molybdenum depressant 3-6 g / t, stirring for 3-5 min, adding frother 2-4 g / t, stirring for 2-3 min; the process conditions of cleaning are adding molybdenum depressant 3-6 g / t, stirring for 3-5 min, adding frother 2-4 g / t, stirring for 2-3 min;

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

[0036] Further, the frother in steps B, E, G is methyl isobutyl carbinol.

[0037] Further, the talc depressant in steps C, D is a fructan.

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

[0039] Further, the neutral oil in steps G, H, I is one or both of the emulsification product of kerosene, diesel oil.

[0040] Further, the frother in steps H, I is propylene glycol ether alcohol.

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

[0042] Further, the main component of the copper-molybdenum collector TF1# in step B, step C, step E is 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 component of the molybdenum inhibitor TD-3 in step H and step I is a mixed product of dextrin, sodium xanthate cellulose and octyl phenol polyoxyethylene ether. Among them, dextrin (30%-40%), sodium xanthate cellulose (40%-60%), and octyl phenol polyoxyethylene ether (5%-10%). Beneficial effects

[0044] Compared with the prior art, the advantages of the present application are:

[0045] 1. In the copper-molybdenum mixed flotation process, no talc inhibitor is added, only the copper-molybdenum collector TF1# with relatively weak pyrite and talc collecting performance is used, which promotes the early separation of copper-molybdenum from part of talc and a large amount of pyrite. The separation is moved forward, which can reduce the burden of talc and pyrite inhibition at the back end, reduce the amount of inhibitor, and avoid the loss of copper-molybdenum minerals caused by excessive use of talc inhibitor and lime.

[0046] 2. The present application sets up a flotation desliming process before regrinding operation, and uses a selective talc inhibitor with mild inhibition performance to control the floating of talc. Reducing the regrinding treatment amount, avoiding the problems of slime covering, mechanical water entrainment, and reagent competitive adsorption in the process of cleaning caused by a large amount of talc and other magnesium gangue after sliming. The coarse particle level "medium floatability" talc is fully intercepted.

[0047] 3. The present application selectively inhibits the newly dissociated fine particle level "medium floatability" talc after regrinding, realizes the maximum interception of the full particle level "medium floatability" talc and other magnesium gangue before the separation of the target mineral, and provides conditions for the separation of talc in the back end of the reverse flotation. It is more suitable for the complex embedded characteristics of talc and other magnesium gangue minerals.

[0048] 4. In the copper-molybdenum mixed flotation process, selective collection and inhibition are used, which is more conducive to the removal of adsorbed reagents before the separation of copper-molybdenum magnesium mixed concentrate compared with the traditional "strong pulling and strong pressing" reagent system of xanthate. It reduces the difficulty of separation and the required copper separation process is relatively short.

[0049] 5. The present application avoids the early loss of copper minerals by avoiding the weak inhibition of flotation environment before copper-molybdenum-magnesium separation, improves the probability of complexly embedded characteristic copper minerals into grinding scrubbing operation, and is beneficial to improve the copper recovery rate. And the full separation of copper minerals and magnesium minerals (talc, fluorine-containing mica, etc.) is obviously advantageous to improve the copper grade of copper concentrate and reduce harmful impurities such as magnesium and fluorine, and realizes the acquisition of high-quality copper concentrate.

[0050] 6. The present application screens the floatability of talc through the front-end process, and controls the best floatability of talc and other magnesium gangue minerals to the back-end copper-molybdenum-magnesium separation process, which is more beneficial to the fine separation of talc and copper-molybdenum minerals.

[0051] 7. The present application uses TD-1# to inhibit molybdenite, sets two molybdenum concentrate outlets, and controls the dosage of TD-1# to carry out step-by-step molybdenum inhibition reverse flotation and magnesium removal. Avoiding the mechanical entrainment caused by "inhibition of less flotation and more" (less molybdenite and more talc), the present application maximizes the molybdenum recovery rate while separating part of the intergrowth molybdenum from the single molybdenum, and realizes the quality control of molybdenum concentrate according to the high and low grade.

[0052] 8. The reagents used in the present application are all conventional flotation reagents, which are environmentally friendly.

[0053] The present application is based on the floatability and embedded feature difference of talc and other layered easy-floating magnesium silicate minerals. By controlling the floatability of talc in the process flow in stages, the present application 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 synchronous inhibition of target metals caused by forcibly inhibiting talc with excellent floatability in the traditional process, and realizes the efficient separation of high-talc skarn-type copper-molybdenum ore. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a process flow diagram of the present application. Embodiment of the present application

[0055] The present application will be further described below in conjunction with examples, but in no way limits the present application, the examples described in the present application are only descriptions of the preferred experimental methods of the present application, and do not limit the concept and scope of the present application. Any modification and improvement based on the teaching of the present application should fall within the scope of the present application.

[0056] The method of the present application for the step-by-step magnesium reduction separation of high-talc skarn-type copper-molybdenum ore includes the steps of pretreatment, one-stage separation, two-stage separation, grinding, three-stage separation, and four-stage separation, and specifically includes:

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

[0058] B, one stage separation: the material a is added to the copper-molybdenum collector and the frother once, and the copper-molybdenum mixed roughing ore b and the copper-molybdenum mixed roughing tailings c are obtained by one roughing, the copper-molybdenum collector and the frother are added to the copper-molybdenum mixed roughing tailings c for two times of scavenging, and the scavenging froth is returned step by step;

[0059] C, two-stage separation: the lime, talc inhibitor and copper-molybdenum collector are sequentially added to the copper-molybdenum mixed roughing ore b, and the copper-molybdenum mixed cleaning is carried out to obtain the copper-molybdenum mixed cleaning ore d and the copper-molybdenum mixed cleaning tailings e, the copper-molybdenum collector is added to the copper-molybdenum mixed cleaning tailings e to carry out the copper-molybdenum mixed cleaning to obtain the copper-molybdenum mixed cleaning tailings f and the tailings g; the copper-molybdenum mixed cleaning tailings f is returned to the copper-molybdenum mixed cleaning step; the tailings g is the final tailings 2;

[0060] D, grinding: the lime and talc inhibitor are sequentially added to the copper-molybdenum mixed cleaning tailings e for grinding, and the material h with a grinding fineness of-74 μm accounting for 80-90% is obtained;

[0061] E, three-stage separation: the copper-molybdenum collector and the frother are sequentially added to the material h, and the copper-molybdenum cleaning ore i is obtained by two-stage copper-molybdenum cleaning and one-stage copper-molybdenum cleaning;

[0062] F, four-stage separation: the copper-molybdenum cleaning ore i is subjected to the removal of the medicine, copper-molybdenum magnesium separation, high-molybdenum-magnesium separation and low-molybdenum-magnesium separation to obtain the low-grade molybdenum concentrate product;

[0063] Specifically:

[0064] 1) removal of the medicine: the copper-molybdenum cleaning ore i is added with clean water for cleaning and concentration to remove the medicine to obtain the material j;

[0065] 2) copper-molybdenum magnesium separation: the copper inhibitor, neutral oil and frother are sequentially added to the material j, and the roughing, one-time scavenging and two-time cleaning are carried out, the intermediate products are returned step by step, the scavenging tailings are the final copper concentrate product, and the froth of the second cleaning is the molybdenum-magnesium rough concentrate product k;

[0066] 3) high-molybdenum-magnesium separation: the molybdenum inhibitor, neutral oil and frother are sequentially added to the molybdenum-magnesium rough concentrate product k, and the roughing is carried out to obtain the high-molybdenum-magnesium separation roughing ore l and the high-molybdenum-magnesium separation roughing tailings m, the molybdenum inhibitor, neutral oil and frother are sequentially added to the high-molybdenum-magnesium separation roughing tailings m for scavenging to obtain the high-molybdenum-magnesium separation scavenging ore n and the high-molybdenum-magnesium separation scavenging tailings; the 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 are the final high-grade molybdenum concentrate product o;

[0067] 4) low-molybdenum-magnesium separation: the molybdenum inhibitor and frother are sequentially added to the high-molybdenum-magnesium separation roughing ore l, and the roughing, one-time scavenging and one-time cleaning are carried out, the intermediate products are returned step by step, the cleaning froth is talc, and the scavenging tailings are the final low-grade molybdenum concentrate product.

[0068] The twice scavenging in the B step is that the copper-molybdenum mixed roughing tailings c is added with a copper-molybdenum collector and a frother to carry out a 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; the copper-molybdenum mixed primary scavenging tailings is added with a copper-molybdenum collector and a frother to carry out a secondary scavenging to obtain copper-molybdenum mixed secondary scavenging ore and final tailings 1; the copper-molybdenum mixed secondary scavenging ore is returned to the primary scavenging.

[0069] The two-stage copper-molybdenum cleaning and the primary copper-molybdenum cleaning scavenging in the E step is that the material h is added with a copper-molybdenum collector and a frother to carry out a primary copper-molybdenum cleaning to obtain primary copper-molybdenum cleaning ore and primary copper-molybdenum cleaning tailings; the primary copper-molybdenum cleaning ore is added with lime to carry out a secondary copper-molybdenum cleaning to obtain copper-molybdenum cleaning ore i and secondary copper-molybdenum cleaning tailings; the primary copper-molybdenum cleaning tailings is added with a copper-molybdenum collector and a frother to carry out a primary copper-molybdenum cleaning scavenging to obtain primary copper-molybdenum cleaning scavenging ore and primary copper-molybdenum cleaning scavenging tailings; the primary copper-molybdenum cleaning scavenging tailings is returned to the copper-molybdenum mixed cleaning step; the primary copper-molybdenum cleaning scavenging ore and the secondary copper-molybdenum cleaning tailings are combined and returned to the primary copper-molybdenum cleaning step.

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

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

[0072] The molybdenum inhibitor in the F step is composed of dextrin, sodium xanthate cellulose and octyl phenol polyoxyethylene ether.

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

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

[0075] The talc inhibitor is a fructan.

[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 application is further described below by means of specific examples:

[0078] Example 1

[0079] A certain plant in Henan province, containing 0.49% copper, 0.028% molybdenum, 13.21% magnesia, 12.42% iron, the main metallic minerals are chalcopyrite, bornite, molybdenite, pyrite, the main easy-to-float magnesium silicate minerals are talc, serpentine, the above ore sample is treated through the following process steps:

[0080] A, one-stage grinding: the broken ore is added with lime 1200g / t for one-stage grinding, and the grinding fineness is 60% of -74μm.

[0081] B, copper-molybdenum mixed roughing-copper-molybdenum and talc one-stage separation: the ore slurry obtained in step A is subjected to one roughing and two scavenging, the roughing process conditions are adding copper-molybdenum collector TF1# 30g / t, stirring for 3min, adding frother methyl isobutyl carbinol 20g / t, stirring for 3min; mixed scavenging 1 process conditions are adding copper-molybdenum collector TF1# 10g / t, stirring for 3min, adding frother methyl isobutyl carbinol 6g / t, stirring for 3min; mixed scavenging 2 process conditions are adding copper-molybdenum collector TF1# 5g / t, stirring for 3min, adding frother methyl isobutyl carbinol 3g / t, stirring for 3min.

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

[0083] D, two-stage grinding: the froth product of step C is added with lime 150g / t and talc depressant fructan 20g / t in turn for two-stage grinding, and the grinding fineness is 85% of -74μm.

[0084] E, copper-molybdenum cleaning-copper-molybdenum and talc three-stage separation: the ore slurry obtained in step D is subjected to two copper-molybdenum cleaning and one copper-molybdenum cleaning scavenging; the process conditions of copper-molybdenum cleaning 1 are adding copper-molybdenum collector TF1# 2g / t, stirring for 3min, frother methyl isobutyl carbinol 2g / t, stirring for 3min; the process conditions of copper-molybdenum cleaning 2 are adding lime 100g / t, stirring for 4min; the process conditions of copper-molybdenum cleaning scavenging are adding copper-molybdenum collector TF1# 2g / t, stirring for 3min, adding frother methyl isobutyl carbinol 2g / t, stirring for 3min.

[0085] F. Copper-molybdenum-magnesium separation: The froth product of step E is added to clean water and concentrated. The concentration product has a concentration of 55%, and the overflow water is used as the front-end operation return water. The concentrated product is put into a stirring mill for scrubbing, and the scrubbed product has a fineness of 85% -45 μm.

[0086] G. Copper-molybdenum-magnesium separation: The product of step F is subjected to one roughing, one scavenging, and two cleaning. The roughing process is adding 350 g / t of sodium sulfide, stirring for 5 min, adding 2 g / t of emulsified kerosene, stirring for 2 min, and adding 2 g / t of foaming agent methyl isobutyl carbinol, stirring for 2 min; the scavenging process is adding 80 g / t of sodium sulfide, stirring for 5 min, adding 1 g / t of emulsified kerosene, stirring for 2 min, and adding 1 g / t of foaming agent methyl isobutyl carbinol, stirring for 2 min; the cleaning 1 process is adding 60 g / t of sodium sulfide, stirring for 2 min, and adding 1 g / t of foaming agent methyl isobutyl carbinol, stirring for 2 min; and the cleaning 2 process is adding 30 g / t of sodium sulfide, stirring for 5 min. The intermediate products are returned step by step, the scavenging tailings are the final copper concentrate product, and the second cleaning froth is the molybdenum-magnesium rough concentrate product.

[0087] H. High-molybdenum-magnesium separation: The molybdenum-magnesium rough concentrate of step G is subjected to one roughing and one scavenging. The roughing process is adding 15 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 5 g / t of emulsified kerosene, stirring for 2 min, and adding 5 g / t of foaming agent propylene glycol ether alcohol, stirring for 2 min; the scavenging process is adding 10 g / t of molybdenum inhibitor TD-3, stirring for 3 min, adding 2 g / t of emulsified kerosene, stirring for 2 min, and adding 3 g / t of foaming agent propylene glycol ether alcohol, stirring for 2 min; and the scavenging tailings are the final high-grade molybdenum concentrate product.

[0088] I. Low-molybdenum-magnesium separation: The roughing froth of step H is subjected to one roughing, one scavenging, and one cleaning. The roughing process is adding 8 g / t of molybdenum inhibitor TD-3, stirring for 3 min, and adding 5 g / t of foaming agent propylene glycol ether alcohol, stirring for 2 min; the scavenging process is adding 6 g / t of molybdenum inhibitor TD-3, stirring for 3 min, and adding 3 g / t of foaming agent propylene glycol ether alcohol, stirring for 2-3 min; and the cleaning process is adding 4 g / t of molybdenum inhibitor TD-3, stirring for 3 min, and adding 2 g / t of foaming agent propylene glycol ether alcohol, stirring for 2 min; the intermediate products are returned step by step, the cleaning froth is talc, and the scavenging tailings are the final low-grade molybdenum concentrate product.

[0089] The ore is treated by the above process flow, and technical indexes of copper concentrate with Cu grade of 26.19% and Cu recovery of 86.54%, high-molybdenum concentrate with Mo grade of 45.37% and Mo recovery of 65.24%, and low-molybdenum concentrate with Mo grade of 22.33% and Mo recovery of 11.24% are obtained. The comprehensive utilization rate of the refractory mineral resources is improved.

[0090] Example 2

[0091] A certain concentrator in Yunnan, containing copper 0.56%, containing molybdenum 0.018%, containing magnesium oxide 10.49%, containing iron 14.12%, the main metal mineral is chalcopyrite, molybdenite, pyrite, and the main easy-to-float magnesium silicate mineral is talc, the above ore sample is treated by the following process steps:

[0092] A, first stage grinding: adding lime 1500g / t to the broken ore for first stage grinding, and the grinding fineness is 55% of-74μm.

[0093] B, copper-molybdenum mixed roughing-copper-molybdenum and talc one-stage separation: the ore slurry obtained in step A is subjected to one roughing and two scavenging, the roughing process conditions are adding copper-molybdenum collector TF1# 30g / t, stirring for 3min, adding frother methyl isobutyl carbinol 25g / t, stirring for 3min; mixed scavenging 1 process conditions are adding copper-molybdenum collector TF1# 12g / t, stirring for 3min, adding frother methyl isobutyl carbinol 8g / t, stirring for 3min; mixed scavenging 2 process conditions are adding copper-molybdenum collector TF1# 6g / t, stirring for 3min, adding frother methyl isobutyl carbinol 4g / t, stirring for 3min.

[0094] C, copper-molybdenum mixed cleaning-copper-molybdenum and talc two-stage separation: the froth product obtained in step B is subjected to one mixed cleaning and one mixed cleaning scavenging process. The mixed cleaning process conditions are adding lime 400g / t, stirring for 4min, adding talc depressant fructan 80g / t, stirring for 5min, adding TF1# 5g / t, stirring for 3min; the mixed cleaning scavenging process is adding copper-molybdenum collector TF1# 3g / t, stirring for 3min;

[0095] D, second stage grinding: the froth product of step C is added with lime 200g / t and talc depressant fructan 15g / t in turn for second stage grinding, and the grinding fineness is 90% of-74μm

[0096] E. Copper-molybdenum-magnesium separation: the product of step D is subjected to two-stage copper-molybdenum cleaning, one-stage copper-molybdenum scavenging, and three-stage separation of copper-molybdenum and talc. The process conditions for copper-molybdenum cleaning 1 are adding copper-molybdenum collector TF1# 3 g / t, stirring for 3 min, adding frother methyl isobutyl carbinol 2 g / t, and stirring for 3 min. The process conditions for copper-molybdenum cleaning 2 are adding lime 80 g / t, and stirring for 4 min. The process conditions for copper-molybdenum scavenging are adding copper-molybdenum collector TF1# 2 g / t, stirring for 3 min, adding frother methyl isobutyl carbinol 2 g / t, and stirring for 3 min.

[0097] F. Pre-drug removal for copper-molybdenum-magnesium separation: the froth product of step E is added to clean water cleaning concentrate, and the concentrate product has a concentration of 50%. The overflow water is returned to the front-end operation as backwater. The concentrate product is subjected to rubbing washing in a stirring mill, and the product after rubbing washing has a fineness of -45 μm accounting for 85%.

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

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

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

[0101] The above process flow is used to process the ore, and technical indexes of copper concentrate with Cu grade of 25.73% and Cu recovery rate of 87.93%, high molybdenum concentrate with Mo grade of 46.15% and Mo recovery rate of 60.88%, and low 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, containing copper 0.48%, containing molybdenum 0.019%, containing magnesium oxide 8.33%, containing iron 13.39%, the main metal minerals are chalcopyrite, chalcocite, molybdenite, pyrite, and the main easy-to-float magnesium silicate minerals are talc and chlorite, the above ore sample is processed through the following process steps:

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

[0105] B. Copper-molybdenum mixed rough selection-copper-molybdenum and talc one-stage separation: the ore slurry obtained in step A is subjected to one rough selection and two scavenging selections, the rough selection process conditions are adding copper-molybdenum collector TF1# 25 g / t, stirring for 3 min, adding foaming agent methyl isobutyl carbinol 20 g / t, stirring for 3 min; the mixed scavenging selection 1 process conditions are adding copper-molybdenum collector TF1# 9 g / t, stirring for 3 min, adding foaming agent methyl isobutyl carbinol 6 g / t, stirring for 3 min; the mixed scavenging selection 2 process conditions are adding copper-molybdenum collector TF1# 5 g / t, stirring for 3 min, adding foaming agent methyl isobutyl carbinol 3 g / t, stirring for 3 min.

[0106] C. Copper-molybdenum bulk flotation - two stage separation of copper-molybdenum and talc: The froth product from step B is subjected to a bulk flotation and a bulk scavenging process. The bulk flotation process conditions are addition of lime 300 g / t, agitation for 4 min, addition of talc depressant fructan 75 g / t, agitation for 5 min, addition of TF1# 4 g / t, agitation for 3 min; the bulk scavenging process is addition of copper-molybdenum collector TF1# 2 g / t, agitation for 3 min;

[0107] D. Secondary grinding: The froth product from step C is subjected to secondary grinding with addition of lime 180 g / t, talc depressant fructan 20 g / t, in sequence, and the grinding fineness is 90% passing 74 μm

[0108] E. Copper-molybdenum cleaning - three stage separation of copper-molybdenum and talc: The slurry from step D is subjected to a two stage copper-molybdenum cleaning and a one stage copper-molybdenum scavenging. The first copper-molybdenum cleaning process conditions are addition of copper-molybdenum collector TF1# 2 g / t, agitation for 3 min, addition of frother methyl isobutyl carbinol 1 g / t, agitation for 3 min; the second copper-molybdenum cleaning process conditions are addition of lime 90 g / t, agitation for 4 min; the copper-molybdenum scavenging process conditions are addition of copper-molybdenum collector TF1# 1 g / t, agitation for 3 min, addition of frother methyl isobutyl carbinol 1 g / t, agitation for 3 min.

[0109] F. Pre-flotation cleaning of copper-molybdenum-magnesium: The froth product from step E is subjected to cleaning thickening with clean water, and the thickened product has a concentration of 55%, and the overflow water is returned to the front end operation as backwater. The thickened product is subjected to attrition scrubbing in an agitator, and the product after scrubbing has a fineness of 85% passing 45 μm.

[0110] G. Copper-molybdenum-magnesium separation: The product from step F is subjected to a one stage roughing, a one stage scavenging, and a two stage cleaning. The roughing process conditions are addition of sodium sulphide 280 g / t, agitation for 5 min, addition of emulsified kerosene 2 g / t, agitation for 2 min, addition of frother methyl isobutyl carbinol 1 g / t, agitation for 2 min; the scavenging process conditions are addition of sodium sulphide 70 g / t, agitation for 5 min, addition of emulsified kerosene 1 g / t, agitation for 2 min, addition of frother methyl isobutyl carbinol 1 g / t, agitation for 2 min; the first cleaning process conditions are addition of sodium sulphide 60 g / t, agitation for 2 min, addition of frother methyl isobutyl carbinol 1 g / t, agitation for 2 min; the second cleaning process conditions are addition of sodium sulphide 30 g / t, agitation for 5 min. The intermediate products are returned in sequence, the scavenging tailings are the final copper concentrate product, and the froth from the second cleaning is the molybdenum-magnesium rough concentrate product.

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

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

[0113] The above process flow is used to process the ore, and technical indexes of copper concentrate Cu grade 27.33%, Cu recovery rate 84.07%; high molybdenum concentrate Mo grade 45.03%, Mo recovery rate 62.03%; low molybdenum concentrate Mo grade 20.16%, Mo recovery rate 10.68% are obtained. The comprehensive utilization rate of refractory mineral resources is improved.

Claims

1. A method for stepwise magnesium reduction separation of high-talc skarn type copper-molybdenum ores, characterized by, The high-talc skarn type copper-molybdenum ore grade magnesium separation method comprises the steps of pretreatment, one-stage separation, two-stage separation, grinding, three-stage separation and four-stage separation, and specifically comprises the following steps: A, pretreatment: adding lime to the broken high-talc skarn type copper-molybdenum ore for grinding, and the grinding fineness is 50-60% of -74 μm to obtain material a; B, one-stage separation: adding copper-molybdenum collector and foaming agent to the material a for one-time roughing to obtain copper-molybdenum mixed roughing ore b and copper-molybdenum mixed roughing tailings c, adding copper-molybdenum collector and foaming agent to the copper-molybdenum mixed roughing tailings c for two-time scavenging, and the scavenging foam is returned step by step; C, two-stage separation: adding lime, talc inhibitor and copper-molybdenum collector to the copper-molybdenum mixed roughing ore b in sequence for copper-molybdenum mixed cleaning to obtain copper-molybdenum mixed cleaning ore d and copper-molybdenum mixed cleaning tailings e, adding copper-molybdenum collector to the copper-molybdenum mixed cleaning tailings e for copper-molybdenum mixed cleaning scavenging to obtain copper-molybdenum mixed cleaning scavenging ore f and tailings g; the copper-molybdenum mixed cleaning scavenging ore f is returned to the copper-molybdenum mixed cleaning step; and the tailings g is final tailings 2; D, grinding: adding lime and talc inhibitor to the copper-molybdenum mixed cleaning tailings e in sequence for grinding, and the grinding fineness is 80-90% of -74 μm to obtain material h; E, three-stage separation: adding copper-molybdenum collector and foaming agent to the material h in sequence for two-stage copper-molybdenum cleaning and one-stage copper-molybdenum cleaning scavenging to obtain copper-molybdenum cleaning ore i; F, four-stage separation: the copper-molybdenum cleaning ore i is subjected to medicine removal, copper-molybdenum magnesium separation, high-molybdenum-magnesium separation and low-molybdenum-magnesium separation to obtain low-grade molybdenum concentrate product; Specifically: 1) medicine removal: adding clean water to the copper-molybdenum cleaning ore i for cleaning concentration medicine removal to obtain material j; 2) copper-molybdenum magnesium separation: adding copper inhibitor, neutral oil and foaming agent to the material j in sequence for roughing, one-time scavenging and two-time cleaning in sequence, the intermediate products are returned step by step, the scavenging tailings are the final copper concentrate product, and the second cleaning foam is a molybdenum-magnesium rough concentrate product k; 3) high-molybdenum-magnesium separation: adding molybdenum inhibitor, neutral oil and foaming agent to the molybdenum-magnesium rough concentrate product k in sequence for roughing to obtain high-molybdenum-magnesium separation roughing ore l and high-molybdenum-magnesium separation roughing tailings m, adding molybdenum inhibitor, neutral oil and foaming agent to the high-molybdenum-magnesium separation roughing tailings m in sequence for scavenging to obtain high-molybdenum-magnesium separation scavenging ore n and high-molybdenum-magnesium separation scavenging tailings; the 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 are the final high-grade molybdenum concentrate product o; 4) low-molybdenum-magnesium separation: adding molybdenum inhibitor and foaming agent to the high-molybdenum-magnesium separation roughing ore l in sequence for roughing, one-time scavenging and one-time cleaning in sequence, 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.

2. The process for stepwise magnesium reduction separation of high talc skarn type copper molybdenum ores according to claim 1, characterized in that, The two-time scavenging in the B step is adding copper-molybdenum collector and foaming agent to the copper-molybdenum mixed roughing tailings c for one-stage scavenging to obtain copper-molybdenum mixed one-stage scavenging ore and copper-molybdenum mixed one-stage scavenging tailings; The copper-molybdenum mixed one-stage scavenging ore is returned to the copper-molybdenum mixed roughing step; The copper-molybdenum mixed secondary cleaning tailings is obtained by adding copper-molybdenum collector and foaming agent to the copper-molybdenum mixed primary cleaning tailings, and the copper-molybdenum mixed secondary cleaning tailings and final tailings 1 are obtained; the copper-molybdenum mixed secondary cleaning tailings returns to the primary cleaning.

3. The method for stepwise magnesium reduction and separation of talc-skiadic type copper-molybdenum ores according to claim 1, characterized in that, The two-stage copper-molybdenum cleaning and the primary copper-molybdenum cleaning in the E step is that the primary copper-molybdenum cleaning is carried out by adding copper-molybdenum collector and foaming agent to the material h, and the primary copper-molybdenum cleaning tailings and the primary copper-molybdenum cleaning tailings are obtained; the secondary copper-molybdenum cleaning is carried out by adding lime to the primary copper-molybdenum cleaning tailings, and the copper-molybdenum cleaning tailings i and the secondary copper-molybdenum cleaning tailings are obtained; the primary copper-molybdenum cleaning tailings is obtained by adding copper-molybdenum collector and foaming agent to the primary copper-molybdenum cleaning tailings, and the primary copper-molybdenum cleaning tailings and the primary copper-molybdenum cleaning tailings are obtained; the primary copper-molybdenum cleaning tailings returns to the copper-molybdenum mixed cleaning step; the primary copper-molybdenum cleaning tailings and the secondary copper-molybdenum cleaning tailings are combined and returned to the primary copper-molybdenum cleaning step.

4. The process for stepwise magnesium reduction separation of high talc skarn type copper molybdenum ores according to claim 1, characterized in that, The copper-molybdenum collector in the B, C and E steps is composed of isopropyl thiourea, ethylene glycol chloroformate and pyridine.

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

6. The process for stepwise magnesium reduction separation of high talc skarn type copper molybdenum ores according to claim 1, characterized in that, The molybdenum inhibitor in the F step is composed of dextrin, sodium xanthate cellulose and octyl phenol polyoxyethylene ether.

7. The process for stepwise magnesium reduction separation of high talc skarn type copper molybdenum ores according to claim 6, characterized by, The mass ratio of the dextrin, sodium xanthate cellulose and octyl phenol polyoxyethylene ether is (2-5):(3-7):(0.3-1.2).

8. The method for stepwise magnesium reduction and separation of high talc skarn type copper-molybdenum ore according to claim 1, characterized in that, The foaming agent in the B step, the E step and 2) of the F step is methyl isobutyl carbinol; the foaming agent in 3) and 4) of the F step is propylene glycol ether alcohol.

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

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

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