Magnesium-reducing flotation collecting agent for pyrrhotite as well as preparation method and application of magnesium-reducing flotation collecting agent
By preparing polystyrene nanoparticle collectors, the adverse effects of serpentine on the flotation of pyrrhotite were resolved, the recovery rate of pyrrhotite was improved and the magnesium content was reduced, achieving a highly efficient flotation effect.
Patent Information
- Application Number
- CN202511297524.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-11
- Publication Date
- 2025-11-07
AI Technical Summary
In the existing technology, during the flotation of pyrrhotite, the presence of serpentine results in a positively charged surface, which easily leads to heterogeneous aggregation with pyrrhotite, reducing the recovery rate and increasing the magnesium content, thus affecting the subsequent smelting effect. There is a lack of effective collectors and methods to mitigate this effect.
Polystyrene nanoparticle collectors were prepared by reacting styrene with functional monomers 1-vinylimidazolium or 4-methyl-5-vinylthiazole under an inert atmosphere. The inhibitory effect of serpentine on pyrrhotite was reduced by modification treatment, thereby improving the flotation effect.
It significantly improved the recovery rate of pyrrhotite and reduced the magnesium content in the concentrate, achieving a highly efficient magnesium reduction and quality improvement effect, and enhancing the grade and recovery rate of the flotation concentrate.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of mineral flotation, in particular to a pyrrhotite magnesium reduction flotation collector and a preparation method and application thereof. BACKGROUND
[0002] Pyrrhotite is widely associated with nickel sulfide ore and is an important raw material for sulfur and iron extraction. The beneficiation plant usually selects pyrrhotite after nickel selection. Flotation is the main beneficiation process. Nickel sulfide ore usually contains a large amount of layered silicate minerals, and existing studies have shown that their presence will seriously affect the flotation of nickel pyrite. Like nickel sulfide ore, the flotation of pyrrhotite is also affected by layered silicate minerals.
[0003] Serpentine is a common magnesium silicate mineral often associated with nickel sulfide ore. Its crystal structure is a layered structure of alternating silicon-oxygen tetrahedron and magnesium-oxygen octahedron. During grinding, it often dissociates along the interlayer. The exposed Si-O-Si, Si 4+ , Mg 2+ and OH - active groups on the dissociation surface lead to a large amount of OH - entering the solution, resulting in the overall positive charge on the surface of serpentine. Pyrrhotite is negatively charged under common flotation pH conditions, and is prone to heterophase coagulation with serpentine. This not only weakens the hydrophobicity of the pyrrhotite surface and reduces the concentrate recovery rate, but also increases the Mg content in the concentrate through mechanical entrainment, which has an adverse effect on the subsequent smelting process. At present, there is still a lack of effective flotation collectors and collection methods to reduce the adverse effects of serpentine cover on flotation.
[0004] Therefore, there is an urgent need to provide new collectors and collection methods to improve the magnesium reduction and quality improvement effect in pyrrhotite flotation. SUMMARY
[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a preparation method of a pyrrhotite magnesium reduction flotation collector. The novel collector preparation method of the present application can prepare a collector that can reduce the adverse effects of serpentine cover on flotation, and has good magnesium reduction and quality improvement effect.
[0006] The present application also provides a pyrrhotite magnesium reduction flotation collector.
[0007] The present application also provides a method for flotation of the pyrrhotite magnesium reduction flotation collector.
[0008] In a first aspect of the present application, a preparation method of a pyrrhotite magnesium reduction flotation collector is provided, comprising the following steps:
[0009] S1, mixing styrene, water and emulsifier solution, and heating and stirring the mixture under inert atmosphere;
[0010] S2, injecting styrene and functional monomer into the system after the reaction, and continuing to heat and stir the mixture;
[0011] S3, purifying the system after the reaction, thereby obtaining the collector for pyrrhotite and magnesium reduction flotation;
[0012] The functional monomer comprises at least one of 1-vinylimidazole or 4-methyl-5-vinylthiazole.
[0013] According to some embodiments of the present application, the styrene is subjected to a purification treatment to remove the polymerization inhibitor therein; the purification treatment comprises lye washing, water washing and reduced-pressure distillation.
[0014] According to some embodiments of the present application, the lye is at least one of 5-10 wt.% NaOH or KOH solution, and the reduced-pressure distillation condition is a temperature of 60-80°C and a pressure of -0.05 to -0.1 Mpa.
[0015] According to some embodiments of the present application, the functional monomer is 1-vinylimidazole; the use of 1-vinylimidazole for modifying the polystyrene nanoparticles has the best effect, and can achieve the optimal flotation recovery effect of pyrrhotite at the lowest dosage, thereby effectively reducing the cost and improving the enterprise benefit.
[0016] According to some embodiments of the present application, the lye washing and water washing mode is as follows: adding styrene and washing liquid in a mass ratio of 1:0.8-1 into a separatory funnel, manually shaking for 2-3 min, and then standing for 2-3 min to allow the liquid in the separatory funnel to separate into layers and pour out the lower layer of washing liquid.
[0017] According to some embodiments of the present application, the heating and stirring reaction temperature is 60-80°C; the reaction time in step S1 is 20-40 min; and the reaction time in step S2 is 16-22 h.
[0018] According to some embodiments of the present application, the mass ratio of styrene, water and emulsifier solution in step S1 is 0.3-1.0:80-120:8-20; and the mass concentration of the emulsifier solution is 0.8%-1.2%.
[0019] According to some embodiments of the present application, the emulsifier is hexadecyl trimethyl.
[0020] According to some embodiments of the present application, the mass of the injected styrene and functional monomer in step S2 is 8-10 times and 0.1-0.3 times the mass of the styrene in step S1, respectively.
[0021] According to some embodiments of the present application, the injection of styrene and functional monomers in step S2 is at a uniform speed of 10-20 μL / min.
[0022] According to some embodiments of the present application, the purification method in step S3 is dialysis, the dialysis bag has a molecular weight cut-off of 3.5-100 kDa, and the dialysis time is 3-5 days with 6-10 water changes.
[0023] In a second aspect of the present application, a collector for pyrrhotite magnesium reduction flotation is provided, wherein the effective component of the collector has a structure formula comprising at least one of formula I or formula II:
[0024] , ;
[0025] The collector for pyrrhotite magnesium reduction flotation is prepared by the preparation method of the first aspect of the present application.
[0026] In a third aspect of the present application, the collector for pyrrhotite magnesium reduction flotation of the second aspect of the present application is applied to high-magnesium Cu-Ni sulfide ore and nickel sulfide ore flotation.
[0027] In a fourth aspect of the present application, a flotation method using the collector for pyrrhotite magnesium reduction flotation of the second aspect of the present application is provided, comprising the following steps:
[0028] S10, crushing and grinding the ore to be treated and adding water to stir to form an ore slurry;
[0029] S20, adding the ore slurry to a flotation tank, adding the collector for pyrrhotite magnesium reduction flotation of the second aspect of the present application, and performing a closed-circuit flotation process, wherein the ore slurry returns in a sequential manner, and the flotation product is filtered and dried.
[0030] According to some embodiments of the present application, the amount of the collector for pyrrhotite magnesium reduction flotation is 10-200 g / t.
[0031] According to some embodiments of the present application, the grinding fineness is 80-85% passing 200 mesh, and the ore slurry concentration is 30-35%.
[0032] According to some embodiments of the present application, the closed-circuit flotation process comprises a one-roughing-two-scavenging-three-cleaning closed-circuit flotation, and the reagent system is as follows:
[0033] Roughing: the depressant is 190-210 g / t sodium hexametaphosphate, 190-210 g / t carboxymethyl cellulose, 130-160 g / t collector, and 15-25 g / t dibutyl dithiophosphoric acid ammonium;
[0034] Primary cleaning: the depressant is 90~110g / t sodium hexametaphosphate or 90~110g / t carboxymethyl cellulose added or not added;
[0035] Secondary cleaning: the depressant is 40~60g / t sodium hexametaphosphate or 40~60g / t carboxymethyl cellulose added or not added;
[0036] Primary scavenging: 90~110g / t collector, 10~15g / t ammonium dibutyl dithiophosphate;
[0037] Secondary scavenging: 40~60g / t collector, 5~10g / t ammonium dibutyl dithiophosphate;
[0038] Tertiary scavenging: 20~30g / t collector, 5~10g / t ammonium dibutyl dithiophosphate.
[0039] The beneficial effects of the present application are:
[0040] The novel collector provided by the present application has the effect of weakening the adverse effect of the serpentine cover on flotation; in the flotation of a pyrrhotite artificial mixed ore containing 5wt.% serpentine (-10μm), the novel collector can preferably obtain an iron concentrate with a Fe recovery rate of 85.7% and a Fe grade of 52.1%, and the Mg content of the iron concentrate is only 0.89%; while using the traditional SEX as the collector, only an iron concentrate with a Fe recovery rate of 6.91% and a Fe grade of 38.1% can be obtained, and the Mg content of the iron concentrate is 5.93%; therefore, the novel collector provided by the present application has good magnesium reduction and quality improvement effects in the flotation of pyrrhotite.
[0041] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or recognized by practicing the application as described, both as provided herein and as necessary in the art. BRIEF DESCRIPTION OF DRAWINGS
[0042] The present application will be further described below in conjunction with the drawings and examples, wherein:
[0043] Figure 1 It is a synthesis flowchart of the collector of the present application;
[0044] Figure 2 It is a SEM image of the adsorption of serpentine and nanoparticles on the surface of pyrrhotite;
[0045] Figure 3 It is a concentrate grade and recovery rate result graph of the flotation recovery of part of the examples and the comparative examples of the present application;
[0046] Figure 4 It is a speed-time variation curve of the collision of bubbles on the surface of pyrrhotite in the test of part of the examples and the comparative examples of the present application;
[0047] Figure 5 Flow chart of the flotation process for Cu-Ni sulfide ore flotation tailings of the embodiments of the present application. DETAILED DESCRIPTION
[0048] The concept and technical effects of the present application will be described below in conjunction with embodiments so as to fully understand the objects, features and effects of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0049] The specific conditions not mentioned in the embodiments are carried out according to the conventional conditions or the conditions recommended by the manufacturers. The reagents or instruments not mentioned by the manufacturers are all conventional products that can be obtained by market purchase.
[0050] Example 1
[0051] The present embodiment provides a preparation method of a collector for pyrrhotite flotation, and a use method for pyrrhotite flotation.
[0052] The test raw materials of the present embodiment are pyrrhotite pure minerals from Inner Mongolia and serpentine pure minerals from Anhui. The two kinds of minerals are ground and sieved to the particle size range of 200-400 meshes, and 0.1 g of serpentine and 1.9 g of pyrrhotite are mixed to obtain an artificial mixed ore containing 5wt.% of serpentine.
[0053] The preparation method of the collector of the present embodiment is as follows:
[0054] 1) Styrene purification: first, wash the styrene with 5wt.% NaOH solution for 3 times to remove the polymerization inhibitor, then wash with pure water for 3 times to make the pH close to 7.0, and finally further purify the styrene at 70℃ and -0.085Mpa under reduced pressure, and store the purified styrene at low temperature in the refrigerator;
[0055] 2) Pre-emulsification: add 100g of pure water, 0.5g of purified styrene and 10g of hexadecyltrimethyl solution (1wt.%) into a 250mL three-necked flask, then flush with N2 for 30min to remove O2 in the three-necked flask, and finally insert a condenser tube to open the condenser water in the oil bath pot to stir at 70℃ for 30min;
[0056] 3) Emulsion polymerization: keep constant temperature stirring, and use a microsyringe to slowly inject 4.5g of purified styrene and 0.1g of 1-vinylimidazole into the reaction container at a speed of 15μL / min, and continue to react for 19h after the addition is completed; the reaction equation and preparation process are as follows:Figure 1 as shown;
[0057] 4) Dialysis purification: After the reaction, the emulsion was filtered and purified for a period of time using a dialysis bag (molecular weight cut-off 3.5-100 kDa), during which the pure water was replaced every 12 h. After 4 days of dialysis, the nanoparticle emulsion collector named PS-VI was obtained.
[0058] This example uses the above-mentioned collector to float pyrrhotite, as follows:
[0059] 2.0 g of mineral sample was weighed into a flotation cell, 38 mL of deionized water was added, and the slurry was stirred for 1 min to make it uniform; 25 mg / L of the new collector PS-VI and 10 mg / L of the frother MIBC (final concentration) were added in turn using a pipette gun, and stirred for 3 min and 1 min, respectively, to ensure that the reagents were dispersed and fully reacted with the minerals; a baffle was inserted, and the froth was scraped manually at a speed of about 6 times / min for 3 min; finally, the concentrate and tailings were filtered, dried, and weighed, and the Fe content and Mg content of the concentrate and tailings were assayed and the recovery rate was calculated.
[0060] SEM observation of the minerals at each stage, as shown in Figure 2 , the surface of the blank pyrrhotite is smooth and has no adsorbates (a) in Figure 2 , when serpentine is added, a large amount of fibrous adsorbates appear on the surface (b) in Figure 2 , EDS spectrum shows that these adsorbates are serpentine (e) in Figure 2 ; after the addition of nanoparticles, the serpentine cover on the surface of pyrrhotite is significantly weakened, and the nanoparticles are adsorbed on the surface of pyrrhotite (c, d) in Figure 2 , indicating that this new collector can still be adsorbed on the surface of pyrrhotite in the presence of serpentine cover.
[0061] As shown in Figure 3 , this test can obtain a pyrrhotite concentrate with Fe grade and Fe recovery rate of 52.1% and 85.7%, respectively, and the Mg content is only 0.89%.
[0062] Comparative Example 1
[0063] The difference between this comparative example and Example 1 is that in this comparative example, the 1-vinylimidazole added in step 3) of the emulsion polymerization in Example 1 is replaced by 4-methyl-5-vinylthiazole; the synthesized nanoparticle emulsion is named PS-MVT collector.
[0064] Using the artificial mixed ore of Example 1 as the raw ore, the same flotation process as Example 1 was used to obtain a pyrrhotite concentrate.
[0065] As shown in Figure 3As shown, this experiment yielded pyrrhotite concentrate with the best Fe grade and Fe recovery rate of 53.9% and 83% respectively under the optimal PS-MVT dosage (67 mg / L), and its Mg content was only 0.488%.
[0066] Comparative Example 2
[0067] The difference between this comparative example and Example 1 is that the 1-vinylimidazole added in step 3) of the emulsion polymerization in Example 1 is removed, no functional monomer is added, and the synthesized nanoparticle emulsion PS is used as a collector.
[0068] Using the artificial mixed ore from Example 1 as the raw ore, pyrrhotite concentrate was obtained by adopting the same flotation process as in Example 1.
[0069] like Figure 3 As shown, this experiment yielded pyrrhotite concentrate with Fe grade and Fe recovery of 55.4% and 83.6% respectively under the optimal PS dosage (405 mg / L), and its Mg content was only 0.31%.
[0070] Comparative Example 3
[0071] This comparative example uses the artificial mixed ore from Example 1 as the raw ore and obtains pyrrhotite concentrate using the same flotation process and reagent system as Example 1. The difference between this comparative example and Example 1 is that the collector is sodium ethyl xanthate (SEX).
[0072] like Figure 3 As shown, this experiment yielded pyrrhotite concentrate with Fe grade and Fe recovery of 38.1% and 6.91% respectively, and Mg content of 5.93% at the optimal SEX dosage (20 mg / L).
[0073] like Figure 4 As shown, the collision process of bubbles on the surface of pyrrhotite was captured using a high-speed camera, and the change of bubble collision velocity over time was analyzed using ImageJ software. The bubbles were observed on a clean pyrrhotite surface. Figure 4 In the collision (a), the velocity gradually decreases until the kinetic energy is exhausted, at which point the velocity reaches 0. However, after a period of time, the velocity will fluctuate again. This is because the liquid film on the surface of the pyrrhotite breaks, forming a three-phase contact line; after adding serpentine ( Figure 4 In (b) of the above, bubbles cannot form a three-phase contact line on the surface of pyrrhotite; after adding serpentine, SEX is added again. Figure 4 (c) still cannot form a three-phase contact line, while adding PS-VI ( Figure 4 However, after (d) in the process, a three-phase contact line can be formed again; this indicates that the novel collector provided by the present invention can promote the formation of a three-phase contact line on the mineral surface, thereby improving the flotation recovery rate.
[0074] Example 2
[0075] The present embodiment provides a preparation method of a collector for pyrrhotite flotation, and a use method for pyrrhotite flotation.
[0076] The test raw material of the present embodiment is a Cu-Ni sulfide flotation tailings from a certain mine in Xinjiang, with Fe, S, SiO2, and MgO contents of 10.28%, 2.26%, 40.95%, and 26.12%, respectively. Fe is mainly in the form of pyrrhotite and hematite, and gangue minerals mainly include serpentine, talc, pyroxene, amphibole, peridot, feldspar, and a small amount of mica and chlorite. The ore is pre-ground to a fineness of 83% passing 200 mesh.
[0077] The preparation method of the collector of the present embodiment is the same as that of Example 1.
[0078] The present embodiment uses the above collector for pyrrhotite flotation, and the method is as follows:
[0079] 500g of the raw ore sample is added to a flotation tank to prepare an ore slurry with a concentration of 32wt.%, and a one-roughing-two-scavenging-three-cleaning closed-circuit flotation is performed. The flotation tank volume for roughing and scavenging operations is 1.5L, and the flotation tank volume for cleaning operations is 0.75L and 0.5L, respectively. The impeller stirring speed is fixed at 1992rpm. The depressant, PS-VI collector, and frother are added to the flotation tank in the order of the set dosage, with an interval of 2min between each addition of a reagent. The froth scraping time is determined according to the specific flotation phenomenon. After each test, the concentrate and tailings are filtered, dried, weighed, and the copper, nickel, and magnesia grades are determined by chemical analysis.
[0080] The flotation process schematic diagram is shown in Figure 5 , wherein the specific flotation reagent system is as follows:
[0081] Roughing: the depressant is 200g / t sodium hexametaphosphate and 200g / t carboxymethyl cellulose, and the collector is 150g / t PS-VI collector and 20g / t dibutyl ammonium dithiophosphate; primary cleaning: 100g / t sodium hexametaphosphate and 100g / t carboxymethyl cellulose; secondary cleaning: 50g / t sodium hexametaphosphate and 50g / t carboxymethyl cellulose; primary scavenging: 100g / t new collector and 15g / t dibutyl ammonium dithiophosphate; secondary scavenging: 50g / t new collector and 10g / t dibutyl ammonium dithiophosphate; and tertiary scavenging: 25g / t new collector and 5g / t dibutyl ammonium dithiophosphate.
[0082] Since the occurrence state of Fe in the raw ore is pyrrhotite and hematite, and the present application is only directed to the flotation of pyrrhotite, the recovery rate of pyrrhotite is calculated according to the S test results. The closed-circuit test results are shown in Table 1, and the final concentrate S grade and S recovery rate are 34.85% and 84.37% respectively, and the Mg content in the concentrate is only 1.06%.
[0083] Example 3
[0084] The difference between the present example and Example 2 is that, in the present example, the 1-vinylimidazole added in step 3) of Example 2 is changed to 4-methyl-5-vinylthiazole, and the synthesized nanoparticle emulsion PS-MVT is used as a collector.
[0085] The Cu-Ni sulfide ore flotation tailings of Example 2 are used as raw ore, and the same flotation process and reagent system as in Example 2 are used to obtain pyrrhotite concentrate, the only difference being that the PS-VI collector is replaced by the PS-MVT collector.
[0086] The closed-circuit test results are shown in Table 1, and the final concentrate S grade and S recovery rate are 34.59% and 78.10% respectively, and the Mg content in the concentrate is 1.68%.
[0087] Comparative Example 4
[0088] The difference between the present example and Example 2 is that, in the present example, the 1-vinylimidazole added in step 3) of Example 2 is changed to 4-methyl-5-vinylthiazole, and the synthesized nanoparticle emulsion PS-MVT is used as a collector.
[0089] The Cu-Ni sulfide ore flotation tailings of Example 2 are used as raw ore, and the same flotation process and reagent system as in Example 2 are used to obtain pyrrhotite concentrate, the only difference being that the PS-VI collector is replaced by the PS-MVT collector.
[0090] The closed-circuit test results are shown in Table 1, and the final concentrate S grade and S recovery rate are 34.59% and 78.10% respectively, and the Mg content in the concentrate is 1.68%.
[0091] Comparative Example 5
[0092] The Cu-Ni sulfide ore flotation tailings of Example 2 are used as raw ore, and the same flotation process and reagent system as in Example 2 are used to obtain pyrrhotite concentrate, the only difference being that the PS-VI collector is replaced by the PS-MVT collector.
[0093] The closed-circuit test results are shown in Table 1, and the final concentrate S grade and S recovery rate are 34.59% and 78.10% respectively, and the Mg content in the concentrate is 1.68%.
[0094]
[0095] From Example 1 and Comparative Examples 1, 2, 3, it can be seen that when SEX is used as the collector, the recovery rate and grade of pyrrhotite are only 6.91% and 38.07%, respectively; in addition, the magnesium content in the concentrate is too high, and the recovery rate and grade of serpentine are 52.62% and 5.93%, respectively. When PS, PS-VI and PS-MVT are used as the collector, the inhibition of sub-10 μm serpentine on the flotation of pyrrhotite is significantly weakened, and the recovery rate and grade of pyrrhotite in the concentrate are about 80% and 53%, respectively, while the recovery rate of serpentine is always less than 20%, and the magnesium content is maintained at 0.5%. Among PS, PS-VI and PS-MVT, the optimal dosage of PS-VI is the lowest (25 mg / L), the optimal dosage of PS is the highest (405 mg / L), and the optimal dosage of PS-MVT is in the middle (67 mg / L), indicating that the modification of polystyrene nanoparticles with the functional monomer is effective, and the modification effect of 1-vinylimidazole is the best.
[0096] From Example 2, 3 and Comparative Examples 4, 5, it can be seen that the modified polystyrene nanoparticles PS-VI and PS-MVT not only can improve the affinity for pyrrhotite and reduce the dosage of reagents, but also can promote the formation of the three-phase contact line on the surface of pyrrhotite covered by serpentine due to the size advantage (about 100 nm Vs 10 Å) of the nanoparticles, which is much larger than that of ethyl xanthate, thereby making the mineral float with the bubbles. Therefore, the novel collector of the application can be used as an effective collector for the flotation of pyrrhotite with reduced magnesium content.
[0097] The above embodiments of the application are described in detail, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. In addition, the embodiments of the application and the features in the embodiments can be combined with each other without conflict.
Claims
1. A process for the preparation of a collector for the flotation of pyrrhotite with reduced magnesium content, characterized in that, The method comprises the following steps: S1, mixing styrene, water and emulsifier solution, and stirring and reacting under inert atmosphere; S2, injecting styrene and functional monomer into the system after reaction, and continuing to stir and react under heating; S3, purifying the system after reaction, to obtain the pyrrhotite magnesium reduction flotation collector. The functional monomer comprises at least one of 1-vinylimidazole or 4-methyl-5-vinylthiazole.
2. The production method according to claim 1, characterized by, The styrene is subjected to purification treatment to remove the polymerization inhibitor therein; the purification treatment comprises lye washing, water washing and reduced pressure distillation.
3. The preparation method according to claim 1, characterized in that, The temperature of the stirring and reaction is 60-80℃; the reaction time in step S1 is 20-40 min; and the reaction time in step S2 is 16-22 h.
4. The method of claim 1, wherein, The mass ratio of styrene, water and emulsifier solution in step S1 is 0.3-1.0:80-120:8-20; and the mass concentration of the emulsifier solution is 0.8%-1.2%; Preferably, the emulsifier is cetyltrimethyl.
5. The preparation method according to claim 1, characterized in that, The mass of the injected styrene and functional monomer in step S2 is 8-10 times and 0.1-0.3 times the mass of the styrene in step S1, respectively; Preferably, the injected styrene and functional monomer in step S2 is injected at a uniform speed of 10-20 μL / min.
6. The method of claim 1, wherein, The purification method in step S3 is dialysis, the molecular cut-off of the dialysis bag used in dialysis is 3.5-100 kDa, and the dialysis time is 3-5 days.
7. A collector for pyrrhotite depression of magnesium in flotation, characterized by The structure of the effective component in the collector comprises at least one of formula I or formula II: ， ； The pyrrhotite magnesium reduction flotation collector is prepared by the preparation method in any one of claims 1-6.
8. The pyrrhotite magnesium reduction flotation collector in claim 7 in the application of high-magnesium Cu-Ni sulfide ore and nickel sulfide ore flotation.
9. A flotation method using the collector for pyrrhotite depression of magnesium-containing minerals according to claim 7, characterized by, The method comprises the following steps: S10, crushing and grinding the to-be-processed ore, adding water and stirring to prepare ore slurry; S20, adding the ore slurry into a flotation tank, adding the pyrrhotite magnesium reduction flotation collector in claim 7, and performing closed-circuit flotation process, wherein the ore slurry returns in a sequential manner, and the flotation product is subjected to filtration and drying treatment.
10. The flotation method according to claim 9, characterized in that, The dosage of the pyrrhotite magnesium reduction flotation collector is 10-200 g / t.