Flotation method for preferential magnesium removal of talc-containing copper-nickel sulfide ore

Abstract

The invention belongs to the technical field of flotation of talc-containing copper-nickel sulfide ores, and discloses a flotation method for preferential magnesium removal of talc-containing copper-nickel sulfide ores, which comprises the following steps of: after grinding and size mixing raw ores, adding neutral higher fatty alcohol as a talc collecting agent to carry out one-time roughing and one-time scavenging process; the content of magnesium oxide is reduced, and the ore pulp flotation environment is improved; and then the copper-nickel minerals are subjected to flotation enrichment separation of two times of roughing. The talc content in the copper-nickel sulfide ore flotation process is remarkably reduced, so that the magnesium oxide content in a copper-nickel concentrate product is reduced, the use of a macromolecular inhibitor in the flotation process can be reduced or replaced, the consumption cost of a flotation reagent is reduced, mechanical entrainment of gangue minerals in the copper-nickel concentrate product is reduced, and the flotation efficiency is improved. Therefore, the influence of the slime on the flotation process is reduced, and the method has great significance in efficiently and economically developing and utilizing talc-containing copper-nickel sulfide ore resources.

Description

Technical Field

[0001] The invention relates to the technical field of flotation of talc-containing copper-nickel sulfide ore, and in particular to a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore. Background Art

[0002] Sulfide copper-nickel ore is the main source of copper-nickel metal in my country, and is often associated with magnesium-containing silicate minerals, including talc, serpentine, chlorite, pyroxene, amphibole, etc. Flotation is the main method to obtain copper-nickel concentrate. During the flotation process of copper-nickel ore, the mud flotation and mechanical entrainment of magnesium-containing gangue minerals lead to the deterioration of the flotation environment. The high content of magnesium oxide in the copper-nickel concentrate will cause slagging in the furnace, increased melting point, poor fluidity and other adverse effects on the subsequent smelting process.

[0003] In the copper-nickel beneficiation process, in order to reduce the magnesium oxide content in the concentrate, the method of adding dispersants or inhibitors during the flotation process is usually adopted. However, due to the difference in the floatability of different magnesium-containing minerals and the influence of mud cover of some magnesium-containing minerals, the following problems exist: (1) The existing inhibitors are poorly effective and cannot effectively inhibit the alteration of magnesium minerals. In particular, talc-containing copper-nickel ores (with too high magnesium oxide content) have poor selective adsorption effects on inhibitors, making it difficult to reduce the magnesium oxide content in the concentrate; (2) After grinding, talc-type copper-nickel ore is prone to muddying, which deteriorates the flotation environment and covers and entrains in the slurry, resulting in an increase in the amount of collector used; (3) Commonly used organic macromolecular inhibitors are expensive and difficult to dilute and prepare. After use, the viscosity of the slurry increases, making it difficult to filter the fine tailings and deteriorating the quality of the tailings water reused. Summary of the invention

[0004] In view of the above-mentioned shortcomings, the present invention provides a flotation method for preferentially removing magnesium from talc-containing sulfide copper-nickel ore. The present invention grinds and slurries the raw ore, adds neutral higher fatty alcohol as a talc collector, and performs a roughing and scavenging process, thereby preferentially removing talc by flotation to reduce the magnesium oxide content and improve the pulp flotation environment; and then performs two roughing flotation enrichment separations on the copper-nickel ore. The present invention significantly reduces the talc content in the flotation process of the sulfide copper-nickel ore, thereby reducing the magnesium oxide content in the copper-nickel concentrate product, can reduce or even eliminate the use of macromolecular organic inhibitors in the flotation process, reduces the consumption cost of reagents, reduces the influence of ore mud on flotation, and reduces the mechanical entrainment of gangue minerals in the copper-nickel concentrate product, which is of great significance for the efficient and economic development and utilization of talc-containing sulfide copper-nickel ore resources.

[0005] In order to achieve the above object, the present invention provides a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore, comprising the following steps: S1. Grind the copper-nickel sulfide ore to a fineness of -0.074 mm accounting for 50-75 wt%, add a talc collector and perform a preferential magnesium removal roughing after slurry preparation to obtain a tank product A1 and a foam product A1; perform a scavenging of the tank product A1 to obtain a tank product A and a foam product A2; the foam product A1 and the foam product A2 are combined into a foam product A, and the foam product A is concentrated and filtered to obtain talc that is preferentially removed by flotation; wherein the talc collector is a neutral higher fatty alcohol; S2, adding a regulator, a collector and a foaming agent to the product A in the tank in sequence, performing the first copper-nickel roughing, and obtaining the product B in the tank and the foam product K1; S3, adding a regulator, a collector and a foaming agent to the product B in the tank in sequence, performing a second copper-nickel roughing, and obtaining a tank product C and a foam product K2.

[0006] According to one aspect of the present invention, in step S1, the neutral higher fatty alcohol is at least one of methyl isobutyl carbinol, methyl pentanol, and 2-ethyl hexanol; and the amount of the neutral higher fatty alcohol is 30-50 g / ton of raw ore.

[0007] According to one aspect of the present invention, the copper-nickel sulfide ore is a talc-containing magnesium silicate copper-nickel sulfide ore. When the copper-nickel metal mineral embedding particle size in the talc-containing magnesium silicate copper-nickel sulfide ore is greater than 38 μm, the flotation method further comprises: S4, the product C in the tank is subjected to a screening process to obtain a product D in the tank and a foam product K3; the product D in the tank is concentrated and filtered to become tailings; the foam product K1, the foam product K2 and the foam product K3 are combined into a foam product K, and the foam product K is concentrated and filtered to obtain a copper-nickel rough concentrate.

[0008] According to one aspect of the present invention, the copper-nickel sulfide ore is a talc-containing magnesium silicate copper-nickel sulfide ore. When the copper-nickel metal mineral embedding particle size in the talc-containing magnesium silicate copper-nickel sulfide ore is less than 38 μm, the flotation method further comprises: S4, dehydrating and grinding the product C in the tank to a fineness of -0.074 mm accounting for 70-90 wt%, and after slurry adjustment, adding a collector and a foaming agent to perform a two-stage copper-nickel roughing to obtain a tank product E and a foam product B; S5, sequentially subjecting the foam product B to the first copper-nickel selection and the second copper-nickel selection to obtain a second-stage low-grade concentrate; sequentially subjecting the in-tank product E to the second-stage first scavenging and the second-stage second scavenging to obtain a final tailing; wherein, the in-tank product of the first copper-nickel selection and the foam product of the second-stage first scavenging are returned to the second-stage copper-nickel roughing process; the in-tank product of the second copper-nickel selection is returned to the first copper-nickel selection process; the foam product of the second-stage second scavenging is returned to the second-stage first scavenging process; S6. The foam product K1 and the foam product K2 are combined into K12 and are concentrated to obtain a concentrated foam product and a concentrated tank product; wherein the concentrated foam product becomes the final concentrate, and the concentrated tank product is returned to the second-stage copper-nickel roughing process of step S4.

[0009] According to one aspect of the present invention, the Ni grade of the talc-type magnesium silicate copper-nickel sulfide ore is 0.3-1.0 wt%, and the content of magnesium oxide is 18-24 wt%.

[0010] According to one aspect of the present invention, in step S2 and step S3, the adjusting agent is at least one of sodium carboxymethyl cellulose, sodium hexametaphosphate and copper sulfate; the collecting agent is at least one of butyl xanthate and ethyl xanthate; and the foaming agent is at least one of 2# oil and butyl ammonium black medicine.

[0011] According to one aspect of the present invention, in step S4, the collector is at least one of butyl xanthate and ethyl xanthate; the foaming agent is at least one of 2# oil and butyl ammonium black medicine.

[0012] According to one aspect of the present invention, in step S1, the concentration after slurry adjustment is 25-40 wt%.

[0013] According to one aspect of the present invention, in step S4, the concentration after slurry adjustment is 15-30 wt%.

[0014] According to one aspect of the present invention, in step S2, the amount of the adjusting agent is 20-200 g / ton of raw ore, the amount of the collecting agent is 30-150 g / ton of raw ore, and the amount of the frother is 10-40 g / ton of raw ore.

[0015] According to one aspect of the present invention, in step S3, the amount of the adjusting agent is 10-200 g / ton of raw ore, the amount of the collecting agent is 10-50 g / ton of raw ore, and the amount of the frother is 5-20 g / ton of raw ore.

[0016] In the present invention, the neutral higher fatty alcohol of the present invention can form stable foam in the talc-containing copper-nickel sulfide ore, and has no collecting performance on the copper-nickel sulfide mineral; after the talc collector of the present application forms stable foam with talc, the talc is easily muddied, and the talc is floated out by utilizing the mechanical entrainment principle of interlayer water between the foams; at the same time, the surface of talc carries a large number of hydroxyl groups, and the talc collector of the present application is a higher fatty alcohol, which contains hydroxyl groups and is more easily adsorbed on the surface of talc, thereby improving the flotation performance of talc.

[0017] Beneficial effects of the present invention: (1) The present invention uses a preferential magnesium removal process and a talc collecting agent with good selectivity to preferentially remove talc with good natural floatability in the ore pulp, significantly reducing the magnesium oxide content in the copper-nickel collection process, thereby reducing the magnesium oxide content in the copper-nickel concentrate product.

[0018] (2) The present invention utilizes the good natural floatability of talc and preferentially removes the talc by flotation, thereby reducing its influence on the subsequent flotation of copper-nickel sulfide.

[0019] (3) The present invention uses a preferential magnesium removal process to effectively reduce or eliminate the use of macromolecular inhibitors in the conventional flotation process, thereby reducing reagent consumption, reducing costs, and avoiding the influence of inhibitors in the return water.

[0020] (4) After removing the talc that is easily sludged, the present invention optimizes the flotation pulp environment of copper-nickel minerals, reduces the influence of ore slime on flotation, reduces the amount of activator and collector used for copper-nickel sulfide ore, and reduces the mechanical entrainment of gangue minerals in the concentrate product, which is of great significance for the efficient and economic development and utilization of talc-type copper-nickel sulfide ore resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial process flow chart of the flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore of the present invention; Figure 2 The process flow of the flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore of the present invention is as follows Figure Ⅰ ; Figure 3 The process flow of the flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore of the present invention is as follows Figure II . DETAILED DESCRIPTION

[0022] To make the present invention easier to understand, the present invention is further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, the professional terms used below are consistent with the meanings understood by professional and technical personnel in the field; unless otherwise specified, the raw materials and reagents involved in this article can be purchased from the market or prepared by known methods.

[0023] It should be noted that higher fatty alcohol is a professional term, which refers to a mixture of monohydric alcohols containing more than 6 carbon atoms; neutral higher fatty alcohol refers to a higher fatty alcohol that does not change the pH value of the slurry after addition.

[0024] In order to overcome the problems of poor inhibitor effect, large amount of collector used and deterioration of flotation environment caused by the existing flotation process of talc-containing magnesium silicate copper-nickel ore, and difficulty in dilution preparation and increased slurry viscosity caused by the use of organic macromolecular inhibitors, the inventors of this application provide a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore, and the process flow chart thereof is as follows: Figure 1 As shown, the following steps are included: S1. Grind the sulfide copper-nickel ore to a fineness of -0.074 mm accounting for 50-75 wt%. After slurrying, add a talc collector and perform a preferential magnesium removal roughing to obtain a tank product A1 and a foam product A1; the tank product A1 is subjected to a scavenging to obtain a tank product A and a foam product A2; the foam product A1 and the foam product A2 are combined into a foam product A, and the foam product A is concentrated and filtered to obtain talc that is preferentially removed by flotation; wherein the talc collector is a neutral higher fatty alcohol; preferably, the neutral higher fatty alcohol is at least one of methyl isobutyl carbinol, methyl amyl alcohol, and 2-ethylhexanol; the amount of the neutral higher fatty alcohol is 30-50 g / ton of raw ore. Preferably, the concentration after slurrying is 25-40 wt%.

[0025] S2. Add an adjusting agent, a collecting agent and a foaming agent to the product A in the tank in sequence, perform the first copper-nickel roughing, and obtain the product B in the tank and the foam product K1; preferably, the adjusting agent is at least one of sodium carboxymethyl cellulose, sodium hexametaphosphate and copper sulfate; the collecting agent is at least one of butyl xanthate and ethyl xanthate; the foaming agent is at least one of 2# oil (pinene alcohol) and butyl ammonium black medicine. Preferably, the concentration after slurry adjustment is 15-30 wt%. Preferably, the amount of the adjusting agent is 20-200 g / ton of raw ore, the amount of the collecting agent is 30-150 g / ton of raw ore, and the amount of the foaming agent is 10-40 g / ton of raw ore.

[0026] S3, adding a regulator, a collector and a foaming agent to the product B in the tank in sequence, and performing a second copper-nickel roughing to obtain a tank product C and a foam product K2. Preferably, the regulator is at least one of sodium carboxymethyl cellulose, sodium hexametaphosphate and copper sulfate; the collector is at least one of butyl xanthate and ethyl xanthate; the foaming agent is at least one of 2# oil and butyl ammonium black medicine. Preferably, the amount of the regulator is 10-200g / ton of raw ore, the amount of the collector is 10-50g / ton of raw ore, and the amount of the foaming agent is 5-20g / ton of raw ore.

[0027] The copper-nickel sulfide ore is a talc-type magnesium silicate copper-nickel sulfide ore; When the copper-nickel metal mineral embedding particle size in the talc-containing magnesium silicate sulfide copper-nickel ore is greater than 38 μm, the flotation method is as follows: Figure 2 As shown, it also includes: S4, the product C in the tank is subjected to a screening process to obtain a product D in the tank and a foam product K3; the product D in the tank is concentrated and filtered to become tailings; the foam product K1, the foam product K2 and the foam product K3 are combined into a foam product K, and the foam product K is concentrated and filtered to obtain a copper-nickel rough concentrate.

[0028] When the copper-nickel metal mineral embedding particle size in the talc-containing magnesium silicate sulfide copper-nickel ore is less than 38 μm, the flotation method is as follows: Figure 3 As shown, it also includes: S4, dehydrating and grinding the product C in the tank to a fineness of -0.074 mm accounting for 70-90 wt%, and after slurry adjustment, adding a collector and a foaming agent to perform a two-stage copper-nickel roughing to obtain a tank product E and a foam product B; S5, sequentially subjecting the foam product B to the first copper-nickel selection and the second copper-nickel selection to obtain a second-stage low-grade concentrate; sequentially subjecting the in-tank product E to the second-stage first scavenging and the second-stage second scavenging to obtain a final tailing; wherein, the in-tank product of the first copper-nickel selection and the foam product of the second-stage first scavenging are returned to the second-stage copper-nickel roughing process; the in-tank product of the second copper-nickel selection is returned to the first copper-nickel selection process; the foam product of the second-stage second scavenging is returned to the second-stage first scavenging process; S6, combining the foam product K1 and the foam product K2 into K12 and performing concentrating to obtain a concentrating foam product and a concentrating tank product; wherein the concentrating foam product becomes the final concentrate, and the concentrating tank product returns to the second stage copper-nickel roughing process of step S4. Preferably, the concentrating times of step S6 are at least once.

[0029] Preferably, the Ni grade of the talc-containing magnesium silicate copper-nickel sulfide ore is 0.3-1.0 wt%, and the magnesium oxide content is 18-24 wt%.

[0030] The following is further described in conjunction with embodiments and comparative examples.

[0031] Example 1 The main mineral composition of a talc-type magnesium silicate copper-nickel sulfide ore is 9.94 wt% talc, 31.35 wt% enstatite, 18 wt% tremolite, and 16 wt% serpentine. The ore element composition is 0.60 wt% Ni, 0.11 wt% Cu, and 20.38 wt% MgO. Among them, the copper-nickel metal minerals in the talc-type magnesium silicate copper-nickel sulfide ore have a particle size greater than 38 μm.

[0032] A flotation method for preferentially removing magnesium from a talc-containing copper-nickel sulfide ore comprises the following steps: 1) The block ore was crushed, rolled, sieved to 1 mm, and then ground. The grinding fineness was -0.074 mm, accounting for 75wt%. The ground product was loaded into the flotation tank and water was added to adjust the pulp concentration to 25 wt%. 30 g / ton of ore methyl isobutyl carbinol was added to the pulp as a talc collector and frother, stirred for 3 min for preferential magnesium removal flotation roughing, and a scavenging was performed to obtain the tank product A and foam product A. The MgO content in the foam product A was 23.10 wt%, the Ni content was 0.35wt%, the yield was 9.5 wt%, and the talc content was 58.14 wt%; the MgO content in the tank product A was 19.1 wt%, the Ni content was 0.71 wt%, and the talc content was 6.52 wt%. The comparison between the two shows that the talc magnesium impurities can be effectively removed with less loss of copper and nickel metals.

[0033] 2) Add 100 g / ton of raw ore copper sulfate as a regulator to the product A in the tank, stir for 3 minutes, then add 150 g / ton of raw ore ethyl xanthate and butyl xanthate mixture as a collector for copper-nickel sulfide ore, stir for 3 minutes, and finally add 40 g / ton of raw ore pinene alcohol as a frother, stir for 2 minutes, and carry out the first copper-nickel roughing. After flotation for 10 minutes, obtain the product B in the tank and the foam product K1.

[0034] 3) 200 g / ton of raw ore copper sulfate is added to the product B in the tank as a regulator, stirred for 3 min, and then 30 g / ton of raw ore ethyl xanthate and butyl xanthate mixed collector is added and stirred for 3 min, and finally 20 g / ton of raw ore pinene alcohol is added as a frother, stirred for 2 min, and the second copper-nickel roughing is carried out. After flotation for 10 min, the product C in the tank and the foam product K2 are obtained; 4) Product C in the tank is scavenged for 10 minutes, and scavenging (no more flotation reagent is added during scavenging) to obtain product D in the tank and foam product K3. Product D in the tank becomes tailings after concentration and filtration; foam product K3 is combined with foam products K1 and K2 to become foam product K. Foam product K is concentrated and filtered to obtain copper-nickel rough concentrate.

[0035] After testing, the Ni grade of the final copper-nickel rough concentrate in this embodiment is 3.16 wt%, the Cu grade is 0.49 wt%, the MgO content is 16.75 wt%, the copper-nickel recovery rate is 84.61 wt%, the Ni grade in the tailings is 0.15 wt%, and the Cu grade is 0.029wt%, and the sorting indicators are relatively ideal.

[0036] Example 2 The difference between this embodiment and embodiment 1 is that the grinding fineness in step 1) is -0.074 mm, accounting for 58 wt%. The other steps and parameters are the same as those in embodiment 1.

[0037] After testing, the foam product A obtained in step 1) of this embodiment has a MgO content of 18.15 wt%, a Ni content of 0.49 wt%, a yield of 9.8 wt%, and a talc content of 55.58 wt%. The Ni grade of the copper-nickel rough concentrate obtained in step 4) of this embodiment is 3.15 wt%, the Cu grade is 0.39 wt%, and the MgO content is 17.88 wt%. The Ni grade in the tailings is 0.17 wt%, and the Cu grade is 0.033 wt%.

[0038] Comparative Example 1 The difference between this comparative example and Example 1 is that an inhibitor is further added in step 2), specifically: 100 g / ton of raw ore of copper sulfate is added to the product A in the tank as a regulator, stirred for 3 min, a mixture of sodium carboxymethyl cellulose and sodium hexametaphosphate is added to the slurry as an inhibitor, the amount of which is 200 g / ton of raw ore, stirred for 5 min, and then 150 g / ton of raw ore of ethyl xanthate and butyl xanthate mixture is added as a sulfide copper-nickel ore collector, stirred for 3 min, and finally 40 g / ton of raw ore of pine oil is added as a frother, stirred for 2 min, and the first copper-nickel roughing is carried out. After flotation for 10 min, the product B in the tank and the foam product K1 are obtained.

[0039] Other steps and parameters are the same as in Example 1.

[0040] After testing, the Ni grade in the final copper-nickel rough concentrate in this comparative example was 3.27 wt%, the Cu grade was 0.53 wt%, the MgO content was 17.07 wt%, the copper-nickel recovery rate was 85.83 wt%, the Ni grade in the tailings was 0.17 wt%, and the Cu grade was 0.033 wt%, and the sorting indicators were relatively ideal.

[0041] Comparative Example 2 The difference between this comparative example and Example 1 is that step 1) does not perform preferential magnesium removal, and step 1) of this comparative example is specifically as follows: crushing the block ore, rolling, screening to 1 mm, and then grinding, the grinding fineness is -0.074 mm accounting for 75 wt%, and the grinding product is loaded into the flotation tank and water is added to adjust the pulp concentration to 25 wt% and used as the tank product A. Other steps and parameters are the same as Example 1.

[0042] After testing, the Ni grade in the final copper-nickel rough concentrate of this comparative example was 2.84 wt%, the Cu grade was 0.54 wt%, and the MgO content was 21.55 wt%. The Ni grade in the tailings was 0.22 wt%, and the Cu grade was 0.035 wt%.

[0043] Result analysis: By comparing the MgO content, Ni content, yield, talc content in the foam product A of Example 1 and Example 2, the Ni grade, Cu grade, MgO content, copper-nickel recovery rate in the final copper-nickel rough concentrate, and the Ni grade and Cu grade in the tailings, it can be seen that when a grinding product with a lower fineness is used for flotation, the amount of copper-nickel metal in the foam product of step 1) increases slightly, the MgO content in the final copper-nickel rough concentrate increases slightly, and the overall sorting indicators are relatively ideal, indicating that the process technology of preferential magnesium removal has good applicability to ores of different finenesses.

[0044] By comparing the Ni grade, Cu grade, MgO content, copper-nickel recovery rate in the final copper-nickel rough concentrate of Example 1 and Comparative Example 1, as well as the Ni grade and Cu grade in the tailings, it can be seen that the preferential magnesium removal process of the present application can eliminate the need for inhibitors in the subsequent copper-nickel metal roughing, while the sorting indicators are close, thereby greatly saving the inhibitor costs of carboxymethyl cellulose and sodium hexametaphosphate and improving the pulp flotation environment.

[0045] By comparing the Ni grade, Cu grade, MgO content, copper-nickel recovery rate in the final copper-nickel rough concentrate of Example 1 and Comparative Example 2, as well as the Ni grade and Cu grade in the tailings, it can be seen that when the preferential demagnesiumization process of the present application is not carried out, the MgO content in the copper-nickel rough concentrate is significantly increased, and the high-magnesium copper-nickel concentrate will have a serious impact on the subsequent smelting process; when the preferential demagnesiumization process of the present application is not carried out, the nickel and copper content in the tailings is significantly increased, indicating that when the preferential demagnesiumization process is not used, the talc sludge has a significant effect on the separation of copper-nickel metals.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore, characterized in that: The following steps are involved: S1. Grind the copper-nickel sulfide ore to a fineness of -0.074 mm accounting for 50-75 wt%, add a talc collector and perform a preferential magnesium removal roughing after slurry preparation to obtain a tank product A1 and a foam product A1; perform a scavenging of the tank product A1 to obtain a tank product A and a foam product A2; the foam product A1 and the foam product A2 are combined into a foam product A, and the foam product A is concentrated and filtered to obtain talc that is preferentially removed by flotation; wherein the talc collector is a neutral higher fatty alcohol; S2, adding a regulator, a collector and a foaming agent to the product A in the tank in sequence, performing the first copper-nickel roughing, and obtaining the product B in the tank and the foam product K1; S3, adding a regulator, a collector and a foaming agent to the product B in the tank in sequence, performing a second copper-nickel roughing, and obtaining a tank product C and a foam product K2.

2. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: In step S1, the neutral higher fatty alcohol is at least one of methyl isobutyl carbinol, methyl pentanol, and 2-ethylhexanol; and the amount of the neutral higher fatty alcohol is 30-50 g / ton of raw ore.

3. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: The copper-nickel sulfide ore is a talc-containing magnesium silicate copper-nickel sulfide ore. When the copper-nickel metal mineral embedded particle size in the talc-containing magnesium silicate copper-nickel sulfide ore is greater than 38 μm, the flotation method further comprises: S4, the product C in the tank is subjected to a screening process to obtain a product D in the tank and a foam product K3; the product D in the tank is concentrated and filtered to become tailings; the foam product K1, the foam product K2 and the foam product K3 are combined into a foam product K, and the foam product K is concentrated and filtered to obtain a copper-nickel rough concentrate.

4. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: The copper-nickel sulfide ore is a talc-containing magnesium silicate copper-nickel sulfide ore. When the copper-nickel metal mineral embedded particle size in the talc-containing magnesium silicate copper-nickel sulfide ore is less than 38 μm, the flotation method further comprises: S4, dehydrating and grinding the product C in the tank to a fineness of -0.074 mm accounting for 70-90 wt%, and after slurry adjustment, adding a collector and a foaming agent to perform a two-stage copper-nickel roughing to obtain a tank product E and a foam product B; S5, sequentially subjecting the foam product B to the first copper-nickel selection and the second copper-nickel selection to obtain a second-stage low-grade concentrate; sequentially subjecting the in-tank product E to the second-stage first scavenging and the second-stage second scavenging to obtain a final tailing; wherein, the in-tank product of the first copper-nickel selection and the foam product of the second-stage first scavenging are returned to the second-stage copper-nickel roughing process; the in-tank product of the second copper-nickel selection is returned to the first copper-nickel selection process; the foam product of the second-stage second scavenging is returned to the second-stage first scavenging process; S6. The foam product K1 and the foam product K2 are combined into K12 and are concentrated to obtain a concentrated foam product and a concentrated tank product; wherein the concentrated foam product becomes the final concentrate, and the concentrated tank product is returned to the second-stage copper-nickel roughing process.

5. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 3 or 4, characterized in that: The talc-containing magnesium silicate copper-nickel sulfide ore has a Ni grade of 0.3-1.0 wt %, and a magnesium oxide content of 18-24 wt %.

6. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: In step S2 and step S3, the adjusting agent is at least one of sodium carboxymethyl cellulose, sodium hexametaphosphate and copper sulfate; the collecting agent is at least one of butyl xanthate and ethyl xanthate; and the foaming agent is at least one of 2# oil and butyl ammonium black medicine.

7. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: In step S1, the concentration after slurry adjustment is 25-40 wt%.

8. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 4, characterized in that: In step S4, the concentration after slurry adjustment is 15-30 wt%.

9. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: In step S2, the dosage of the adjusting agent is 20-200 g / ton of raw ore, the dosage of the collecting agent is 30-150 g / ton of raw ore, and the dosage of the frother is 10-40 g / ton of raw ore.

10. The flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore according to claim 1, characterized in that: In step S3, the dosage of the adjusting agent is 10-200 g / ton of raw ore, the dosage of the collecting agent is 10-50 g / ton of raw ore, and the dosage of the frother is 5-20 g / ton of raw ore.

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