A flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore

Abstract

The present invention belongs to the technical field of flotation of talc-containing copper-nickel sulfide ore, and discloses a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore. After the original ore is ground and pulp is adjusted, neutral higher fatty alcohol is added as a talc collector for one roughing and one scavenging process, so as to preferentially float and remove talc to reduce the magnesium oxide content and improve the pulp flotation environment; then the copper-nickel minerals are subjected to two roughing flotation enrichment and separation. The present invention significantly reduces the talc content in the flotation process of copper-nickel sulfide ore, thereby reducing the magnesium oxide content in the copper-nickel concentrate product, can reduce or replace the use of macromolecular inhibitors in the flotation process, reduces the consumption cost of flotation reagents, reduces the mechanical entrainment of gangue minerals in the copper-nickel concentrate product, and thus reduces the influence of slime on the flotation process, which has great significance for the efficient and economical development and utilization of talc-containing copper-nickel ore resources.

Description

Technical Field

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

[0002] Copper-nickel sulfide ores are the main sources of copper and nickel metals in China, and are often symbiotic with magnesium-containing silicate minerals, including talc, serpentine, chlorite, pyroxene, amphibole, etc. Flotation is the main method for obtaining copper-nickel concentrates. During the flotation process of copper-nickel ores, due to the slime floating and mechanical entrainment of magnesium-containing gangue minerals, the flotation environment deteriorates, and the magnesium oxide content in the copper-nickel concentrate is too high, which will have adverse effects on subsequent smelting processes such as slagging in the furnace, increasing melting point, and poor fluidity.

[0003] In the copper-nickel ore beneficiation process, in order to reduce the magnesium oxide content in the concentrate, a method of adding a dispersant or inhibitor during the flotation process is usually adopted. However, due to the difference in floatability of different magnesium-containing minerals and the influence of slime covering of some magnesium-containing minerals, the following problems exist:

[0004] (1) The existing inhibitors have poor effects and cannot effectively inhibit altered magnesium minerals. Especially for talc-containing copper-nickel ores (with too high magnesium oxide content), the selective adsorption effect of inhibitors is poor, and it is difficult to reduce the magnesium oxide content in the concentrate;

[0005] (2) Talc in talc-containing copper-nickel ores is easy to slime after grinding, the flotation environment deteriorates, and it covers and entrains in the pulp, resulting in an increase in the dosage of collector;

[0006] (3) The commonly used organic macromolecular inhibitor has a high pharmaceutical cost, is difficult to dilute and prepare, and the pulp viscosity increases after use, resulting in difficult filtration of concentrate and tailings, and poor quality of recycled tailings water. Summary of the Invention

[0007] In view of the above-mentioned deficiencies existing currently, the present invention provides a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ores. After grinding and pulp conditioning of the raw ore, a neutral higher fatty alcohol is added as a talc collector for a one-stage roughing and one-stage scavenging process, so as to preferentially float and remove talc to reduce the magnesium oxide content and improve the flotation environment of the pulp; then the copper-nickel minerals are subjected to two-stage roughing for flotation enrichment and separation. The present invention significantly reduces the talc content during the flotation process of copper-nickel sulfide ores, thereby reducing the magnesium oxide content in the copper-nickel concentrate products, can reduce or even cancel the use of macromolecular organic inhibitors during the flotation process, reduces the consumption cost of pharmaceuticals, reduces the influence of slime on flotation, reduces the mechanical entrainment of gangue minerals in the copper-nickel concentrate products, and has great significance for the efficient and economic development and utilization of talc-containing copper-nickel sulfide ore resources.

[0008] To achieve the above object, the present invention provides a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ores, including the following steps:

[0009] S1. Grind the copper-nickel sulfide raw ore to a fineness of -0.074 mm accounting for 50 - 75 wt%. After pulp conditioning, add a talc collector and conduct a primary preferential magnesium removal roughing to obtain the in-tank product A1 and the froth product A1. Conduct a single scavenging on the in-tank product A1 to obtain the in-tank product A and the froth product A2. The froth products A1 and A2 are combined into the froth product A. After the froth product A is concentrated and filtered, the talc preferentially flotation removed is obtained. Among them, the talc collector is a neutral higher fatty alcohol;

[0010] S2. Add a regulator, a collector, and a frother to the in-tank product A in sequence and conduct the first copper-nickel roughing to obtain the in-tank product B and the froth product K1;

[0011] S3. Add a regulator, a collector, and a frother to the in-tank product B in sequence and conduct the second copper-nickel roughing to obtain the in-tank product C and the froth product K2.

[0012] 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 amyl alcohol, and 2-ethylhexanol; the dosage of the neutral higher fatty alcohol is 30 - 50 g / ton of raw ore.

[0013] According to one aspect of the present invention, the copper-nickel sulfide ore is a talc-containing silicate magnesium sulfide copper-nickel ore. When the dissemination size of the copper-nickel metal minerals in the talc-containing silicate magnesium sulfide copper-nickel ore is greater than 38 μm, the flotation method further includes:

[0014] S4. Conduct a single scavenging on the in-tank product C to obtain the in-tank product D and the froth product K3. The in-tank product D becomes the tailings after concentration and filtration. The froth products K1, K2, and K3 are combined into the froth product K. After the froth product K is concentrated and filtered, the copper-nickel rough concentrate is obtained.

[0015] According to one aspect of the present invention, the copper-nickel sulfide ore is a talc-containing silicate magnesium sulfide copper-nickel ore. When the dissemination size of the copper-nickel metal minerals in the talc-containing silicate magnesium sulfide copper-nickel ore is 38 μm or less, the flotation method further includes:

[0016] S4. Dehydrate and grind the in-tank product C to a fineness of -0.074 mm accounting for 70 - 90 wt%. After pulp conditioning, add a collector and a frother and conduct a two-stage copper-nickel roughing to obtain the in-tank product E and the froth product B;

[0017] S5. The foam product B is subjected to the first copper-nickel concentration and the second copper-nickel concentration in sequence to obtain second-stage low-grade concentrate; the in-tank product E is subjected to the first second-stage scavenging and the second second-stage scavenging in sequence to obtain the final tailings; among them, the in-tank product of the first copper-nickel concentration and the foam product of the first second-stage scavenging are returned to the second-stage copper-nickel roughing process; the in-tank product of the second copper-nickel concentration is returned to the first copper-nickel concentration process; the foam product of the second second-stage scavenging is returned to the first second-stage scavenging process.

[0018] S6. The foam products K1 and K2 are combined into K12 and subjected to concentration to obtain a concentrated foam product and a concentrated in-tank product; among them, the concentrated foam product becomes the final concentrate, and the concentrated in-tank product is returned to the second-stage copper-nickel roughing process of step S4.

[0019] According to one aspect of the present invention, the Ni grade of the talc-containing magnesium silicate-type copper-nickel sulfide ore is 0.3-1.0 wt%, and the content of magnesium oxide is 18-24 wt%.

[0020] According to one aspect of the present invention, in steps S2 and S3, the regulator is at least one of sodium carboxymethylcellulose, 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 No. 2 oil and ammonium butyl dithiophosphate.

[0021] 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 No. 2 oil and ammonium butyl dithiophosphate.

[0022] According to one aspect of the present invention, in step S1, the concentration after pulp adjustment is 25-40 wt%.

[0023] According to one aspect of the present invention, in step S4, the concentration after pulp adjustment is 15-30 wt%.

[0024] According to one aspect of the present invention, in step S2, the dosage of the regulator is 20-200 g / ton of raw ore, the dosage of the collector is 30-150 g / ton of raw ore, and the dosage of the foaming agent is 10-40 g / ton of raw ore.

[0025] According to one aspect of the present invention, in step S3, the dosage of the regulator is 10-200 g / ton of raw ore, the dosage of the collector is 10-50 g / ton of raw ore, and the dosage of the foaming agent is 5-20 g / ton of raw ore.

[0026] 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 at the same time has no collecting performance for copper-nickel sulfide minerals; after the talc collector of the present application forms stable foam with talc, due to the easy slimeification of talc, using the principle of mechanical entrainment of the interlayer water between foams, the talc is floated out; at the same time, a large number of hydroxyl groups are carried on the surface of talc, and the talc collector of the present application is a higher fatty alcohol, which contains hydroxyl groups and is more likely to be adsorbed on the surface of talc, improving the flotation performance of talc.

[0027] Advantages of the present invention:

[0028] (1) The present invention uses a process of preferentially removing magnesium and a talc collector with good selectivity to preferentially remove talc with good natural floatability in the 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.

[0029] (2) The present invention utilizes the characteristic that talc has good natural floatability, preferentially floats and removes talc, and reduces its influence on the subsequent flotation of copper-nickel sulfide.

[0030] (3) By using the process of preferentially removing magnesium, the present invention effectively reduces or eliminates the use of macromolecular inhibitors in the conventional flotation process, reduces reagent consumption and cost, and avoids the influence of inhibitors in the recycled water.

[0031] (4) After removing the easily slimeified talc, the present invention optimizes the flotation pulp environment of copper-nickel minerals, reduces the influence of slime on flotation, reduces the consumption of activators and collectors for copper-nickel sulfide ore, reduces the mechanical entrainment of gangue minerals in the concentrate product, and has great significance for the efficient and economical development and utilization of talc-containing copper-nickel ore resources. Description of the drawings

[0032] Figure 1 It is a partial process flow diagram of the flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore of the present invention;

[0033] Figure 2 It is the process flow of the flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore of the present invention Figure Ⅰ ;

[0034] Figure 3 It is the process flow of the flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore of the present invention Figure Ⅱ 。 Detailed implementation manners

[0035] To make the present invention easier to understand, the present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention. Unless otherwise defined, the professional terms used below have the same meaning as understood by those of ordinary skill in the art; unless otherwise specified, the raw materials and reagents involved in this article can be purchased from the market or prepared by well-known methods.

[0036] It should be noted that higher fatty alcohols are professional terms, indicating a mixture of monohydric alcohols containing more than 6 carbon atoms; neutral higher fatty alcohols refer to higher fatty alcohols that do not change the pH value of the pulp after being added.

[0037] In order to overcome the problems such as poor inhibitor effect, large collector dosage, etc. in the flotation process of talc-containing magnesium silicate-type copper-nickel sulfide ore, which lead to the deterioration of the flotation environment, as well as the difficulties in dilution preparation and the increase in pulp viscosity caused by the use of organic macromolecular inhibitors, the inventors of the present application provided a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore, and its process flow chart is as Figure 1 shown, including the following steps:

[0038] S1. Grind the copper-nickel sulfide ore to a fineness of -0.074 mm accounting for 50-75 wt%. After pulp conditioning, add a talc collector and conduct a first-stage preferential magnesium removal roughing to obtain the in-tank product A1 and the froth product A1; the in-tank product A1 is subjected to a first-stage scavenging to obtain the in-tank product A and the froth product A2; the froth products A1 and A2 are combined into the froth product A. After the froth product A is concentrated and filtered, the preferentially flotated talc is obtained; 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 dosage of the neutral higher fatty alcohol is 30-50 g / ton of raw ore. Preferably, the concentration after pulp conditioning is 25-40 wt%.

[0039] S2. Add a regulator, a collector, and a frother to the product A in the cell in sequence, and conduct the first rough selection of copper and nickel to obtain the product B in the cell and the froth product K1. 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 frother is at least one of No. 2 oil (terpineol) and ammonium butyl dithiophosphate. Preferably, the concentration after pulp conditioning is 15 - 30 wt%. Preferably, the dosage of the regulator is 20 - 200 g / ton of raw ore, the dosage of the collector is 30 - 150 g / ton of raw ore, and the dosage of the frother is 10 - 40 g / ton of raw ore.

[0040] S3. Add a regulator, a collector, and a frother to the product B in the cell in sequence, and conduct the second rough selection of copper and nickel to obtain the product C in the cell and the froth 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 frother is at least one of No. 2 oil and ammonium butyl dithiophosphate. Preferably, the dosage of the regulator is 10 - 200 g / ton of raw ore, the dosage of the collector is 10 - 50 g / ton of raw ore, and the dosage of the frother is 5 - 20 g / ton of raw ore.

[0041] The copper-nickel sulfide ore is a talc-containing magnesium silicate-type copper-nickel sulfide ore;

[0042] When the dissemination size of the copper-nickel metal minerals in the talc-containing magnesium silicate-type copper-nickel sulfide ore is greater than 38 μm, the flotation method is as Figure 2 shown, and further includes:

[0043] S4. Conduct one scavenging on the product C in the cell to obtain the product D in the cell and the froth product K3; the product D in the cell becomes tailings after concentration and filtration; combine the froth products K1, K2, and K3 into the froth product K, and after concentration and filtration of the froth product K, copper-nickel rough concentrate is obtained.

[0044] When the dissemination size of the copper-nickel metal minerals in the talc-containing magnesium silicate-type copper-nickel sulfide ore is 38 μm or less, the flotation method is as Figure 3 shown, and further includes:

[0045] S4. Dehydrate and grind the product C in the cell to a fineness of -0.074 mm accounting for 70 - 90 wt%, after pulp conditioning, add a collector and a frother for the second-stage rough selection of copper and nickel to obtain the product E in the cell and the froth product B;

[0046] S5. The foam product B is subjected to the first stage of copper-nickel beneficiation and the second stage of copper-nickel beneficiation in sequence to obtain a second-stage low-grade concentrate; the in-tank product E is subjected to the first stage of scavenging and the second stage of scavenging in sequence to obtain a final tailing; wherein, the in-tank product of the first stage of copper-nickel beneficiation and the foam product of the first stage of scavenging in the second stage are returned to the second-stage copper-nickel roughing process; the in-tank product of the second stage of copper-nickel beneficiation is returned to the first stage of copper-nickel beneficiation process; the foam product of the second stage of scavenging is returned to the first stage of scavenging process in the second stage.

[0047] S6. The foam products K1 and K2 are combined into K12 and subjected to beneficiation to obtain a beneficiated foam product and a beneficiated in-tank product; wherein, the beneficiated foam product becomes the final concentrate, and the beneficiated in-tank product is returned to the second-stage copper-nickel roughing process in step S4. Preferably, the number of beneficiation times in step S6 is at least once.

[0048] Preferably, the Ni grade of the talc-containing magnesium silicate-type copper-nickel sulfide ore is 0.3 - 1.0 wt%, and the content of magnesium oxide is 18 - 24 wt%.

[0049] The following is further elaborated in combination with examples and comparative examples.

[0050] Example 1

[0051] A certain talc-containing magnesium silicate-type copper-nickel sulfide ore, the main mineral components are talc 9.94 wt%, enstatite 31.35 wt%, tremolite 18 wt%, serpentine 16 wt%. The ore element composition is Ni grade 0.60 wt%, Cu grade 0.11 wt%, and MgO content 20.38 wt%. Among them, the embedding particle size of copper-nickel metal minerals in the talc-containing magnesium silicate-type copper-nickel sulfide ore is greater than 38 μm.

[0052] A flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore, comprising the following steps:

[0053] 1) The massive ore is crushed, roll-pressed, and screened to 1 mm, then ground, and the grinding fineness is -0.074 mm accounting for 75 wt%. The ground product is loaded into a flotation cell and the pulp concentration is adjusted to 25 wt% by adding water; 30 g / ton of methyl isobutyl carbinol is added to the pulp as a talc collector and foaming agent, and stirred for 3 min for preferential magnesium removal flotation roughing and one scavenging to obtain an in-tank product A and a foam product A. The MgO content in the foam product A is 23.10 wt%, the Ni content is 0.35 wt%, the yield is 9.5 wt%, and the talc content is 58.14 wt%; the MgO content in the in-tank product A is 19.1 wt%, the Ni content is 0.71 wt%, and the talc content is 6.52 wt%. The comparison between the two shows that the talc magnesium impurities can be effectively removed with less loss of copper-nickel metals.

[0054] 2) Add copper sulfate at 100 g / ton of raw ore as a regulator to product A in the cell, stir for 3 min, then add a mixture of ethyl xanthate and butyl xanthate at 150 g / ton of raw ore as a collector for copper-nickel sulfide ore, stir for 3 min, and finally add terpineol at 40 g / ton of raw ore as a foaming agent, stir for 2 min, and conduct the first rough selection of copper and nickel. After 10 min of flotation, obtain product B in the cell and froth product K1.

[0055] 3) Continue to add copper sulfate at 200 g / ton of raw ore as a regulator to product B in the cell, stir for 3 min, then add a mixed collector of ethyl xanthate and butyl xanthate at 30 g / ton of raw ore and stir for 3 min, and finally add terpineol at 20 g / ton of raw ore as a foaming agent, stir for 2 min, and conduct the second rough selection of copper and nickel. After 10 min of flotation, obtain product C in the cell and froth product K2;

[0056] 4) Conduct scavenging on product C in the cell for 10 min. After scavenging (no additional flotation reagents are added during scavenging), obtain product D in the cell and froth product K3. Product D in the cell becomes tailings after concentration and filtration; Froth product K3 is combined with froth products K1 and K2 to form froth product K. After froth product K is concentrated and filtered, copper-nickel rough concentrate is obtained.

[0057] After detection, in this example, the Ni grade of the final copper-nickel rough concentrate 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 0.029 wt%. The separation indexes are relatively ideal.

[0058] Example 2

[0059] The difference between this example and Example 1 is that the grinding fineness in step 1) is 58 wt% of -0.074 mm. Other steps and parameters are the same as in Example 1.

[0060] After detection, the MgO content in the froth product A obtained in step 1) of this example is 18.15 wt%, the Ni content is 0.49 wt%, the yield is 9.8 wt%, and the talc content is 55.58 wt%. The Ni grade in the copper-nickel rough concentrate obtained in step 4) of this example is 3.15 wt%, the Cu grade is 0.39 wt%, 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%.

[0061] Comparative Example 1

[0062] The differences between this comparative example and Example 1 are as follows: In step 2), an inhibitor was also added. Specifically, 100 g / ton of copper sulfate based on the original ore was added to Product A in the cell as a regulator and stirred for 3 min. A mixture of sodium carboxymethyl cellulose and sodium hexametaphosphate was added to the pulp as an inhibitor at a dosage of 200 g / ton of the original ore and stirred for 5 min. Then, a mixture of ethyl xanthate and butyl xanthate at 150 g / ton of the original ore was added as a collector for copper-nickel sulfide ore and stirred for 3 min. Finally, 40 g / ton of the original ore of terpineol was added as a foaming agent and stirred for 2 min to conduct the first rough selection of copper and nickel. After 10 min of flotation, Product B in the cell and froth product K1 were obtained.

[0063] Other steps and parameters are the same as those in Example 1.

[0064] After detection, 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%. The separation indexes were relatively ideal.

[0065] Comparative Example 2

[0066] The differences between this comparative example and Example 1 are as follows: In step 1), preferential magnesium removal was not carried out. Specifically, in step 1) of this comparative example, the massive ore was crushed, roll-pressed, and screened to 1 mm, then ground, and the grinding fineness was such that -0.074 mm accounted for 75 wt%. The ground product was loaded into the flotation cell and water was added to adjust the pulp concentration to 25 wt% as Product A in the cell. Other steps and parameters are the same as those in Example 1.

[0067] After detection, the Ni grade in the final copper-nickel rough concentrate in this comparative example was 2.84 wt%, the Cu grade was 0.54 wt%, 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%.

[0068] Result analysis:

[0069] By comparing the MgO content, Ni content, yield, talc content in froth product A in Example 1 and Example 2, as well as 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 using ground products with a lower fineness for flotation, the amount of copper and nickel metals in the froth product in step 1) increased slightly, and the MgO content in the final copper-nickel rough concentrate increased slightly. The overall separation indexes were relatively ideal, indicating that the process technology of preferential magnesium removal had good applicability to raw ores with different finenesses.

[0070] 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, and the Ni grade and Cu grade in the tailings, it can be seen that when using the preferential magnesium removal process of the present application, inhibitors do not need to be used in the subsequent rough selection of copper-nickel metals, and the separation indexes are close. Thus, the inhibitor costs of carboxymethyl cellulose and sodium hexametaphosphate are greatly saved, and the pulp flotation environment is improved.

[0071] 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, and the Ni grade and Cu grade in the tailings, it can be seen that when the preferential magnesium removal process of the present application is not carried out, the MgO content in the copper-nickel rough concentrate increases significantly, and the high-magnesium copper-nickel concentrate will have a serious impact on the subsequent smelting process; when the preferential magnesium removal process of the present application is not carried out, the nickel and copper contents in the tailings increase significantly, indicating that when the preferential magnesium removal process is not used, the talc slime has a significant impact on the separation of copper-nickel metals.

[0072] As described above, the above are only specific embodiments 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 those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to 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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