A method of flotation of sulphide ores

Abstract

This invention discloses a flotation method for sulfide ores, comprising the following steps: (1) grinding the sulfide ore to obtain a slurry; (2) adjusting the pH value of the slurry, and then sequentially adding a pyrite inhibitor, a collector, and a frother, and performing flotation to obtain a concentrate and tailings; the chemical structural formula of the pyrite inhibitor is shown in formula (I). The flotation method of this invention preferably uses a pyrite inhibitor, which can be widely used in the separation of copper and sulfur, lead and zinc and sulfur, and the separation of lead, antimony, molybdenum, bismuth and sulfur to inhibit pyrite, marcasite and pyrrhotite. It can produce a strong inhibitory effect on pyrite and pyrrhotite, and has the characteristics of small dosage, non-toxic and environmentally friendly, and can replace sodium cyanide. At the same time, it can effectively solve the problem of excessively high slurry pH value and low separation efficiency caused by the large use of lime, which is conducive to improving the grade of the target mineral concentrate and the flotation recovery rate.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and more particularly to a flotation method for sulfide ores. Background Technology

[0002] Pyrite, generally referring to pyrite, marcasite, and pyrrhotite, is often used as a primary mineral raw material for sulfur extraction and sulfuric acid production. Because pyrite is usually closely associated with chalcopyrite, molybdenum-bismuth sulfide, galena, sphalerite, antimony sulfide, and precious metals such as gold and silver, it is difficult to separate, often resulting in reduced grades and recovery rates of useful minerals. This severely impacts the economic benefits of mining enterprises and also adversely affects subsequent smelting processes. Therefore, the development and application of highly efficient selective inhibitors for pyrite are crucial.

[0003] Traditional pyrite inhibitors can be mainly divided into inorganic inhibitors and organic inhibitors. Representative inorganic inhibitors include lime and cyanide. Currently, the lime method is the most widely used method for inhibiting pyrite in copper-sulfur separation of copper ore. A large amount of lime is usually added under high alkalinity conditions to inhibit pyrite minerals (Li Chao, Ling Shisheng. Experimental study on low alkalinity copper-sulfur separation flotation of a copper mine in Inner Mongolia [J]. Mining and Metallurgy, 2024, 33(1):39-45.). Although the lime method has a good separation effect, it has disadvantages such as large lime consumption and easy scaling of pipelines. Moreover, the inhibited pyrite at the downstream end needs to be activated with sulfuric acid (Li Guodong, Qiu Tingsheng, Guo Haining et al. Experimental study on low alkalinity flotation process of a complex copper-sulfur ore containing gold [J]. Metal Mining, 2020, (11): 95-99.), which poses a great safety risk. In addition, in the high alkalinity slurry environment, the associated precious metals are difficult to recover and utilize, which will also make it difficult to improve the grade of copper concentrate. In the separation of molybdenum and bismuth from pyrite and pyrrhotite in molybdenum-bismuth sulfide ores, sodium cyanide is usually used as an inhibitor, which has a good inhibitory effect. However, sodium cyanide is a highly toxic substance and will cause serious environmental pollution. With the increasing emphasis on mine environmental protection by the state, the development of cyanide-free and environmentally friendly recycling processes is an inevitable direction. Among them, the development of selective inhibitors for pyrite and pyrrhotite has become a top priority (Hu Xinhong, He Binquan, Xu Daogang, et al. Research on the industrial application of a new cyanide-free recovery process for molybdenum-bismuth sulfide in Shizhuyuan [J]. Mining and Metallurgical Engineering, 2022, 42(04): 82-85.). Organic inhibitors for pyrite mainly include glycerol xanthate and humate. He et al. studied the mechanism of action of the inhibitor sodium glyceroxanthate (SGX) in the flotation separation process of sphalerite and pyrite. The results showed that with butyl xanthate as a collector, sphalerite can be separated from Cu in the presence of SGX. 2+ Activation gives it good floatability, while pyrite cannot be floated by Cu. 2+Activation, within a pH range of 4–11, when the dosage of SGX is less than 50 mg / L, can achieve selective separation of the two minerals (HE Ming-fei, QIN Wen-qing, LI Wei-zhon, et al. Pyrite depression in marmatite flotation by sodium glycerine-xanthate [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(05): 1161-1165.). Wei Min et al. found that starch, under pH 8.0 conditions, adsorbs onto the surface of pyrite through physicochemical action, enhancing the hydrophilicity of pyrite, and the macromolecular chain structure of starch covers the active metal ions on the surface of pyrite, thereby hindering the interaction between the collector and pyrite (Wei Min, Lü Jinfang, Zheng Yongxing et al. Research progress on the selective inhibition effect and mechanism of starch on sulfide minerals and gangue minerals [J]. Mineral Resources Conservation and Utilization, 2021, 41(02):58-64.). However, existing organic inhibitors have poor selectivity in separating useful minerals such as pyrite from chalcopyrite, molybdenite, sphalerite, and galena. Summary of the Invention

[0004] This invention provides a flotation method for sulfide ores to solve the technical problem mentioned in the background art of poor selectivity and ineffective use of pyrite inhibitors in existing sulfide ores flotation processes.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A flotation method for sulfide ores includes the following steps:

[0007] (1) The sulfide ore is ground to a certain fineness to obtain a slurry;

[0008] (2) Adjust the pH value of the slurry, and then add pyrite inhibitor, collector, and frother to the slurry in sequence to carry out flotation to obtain concentrate and tailings; the pyrite inhibitor includes substances with the chemical structural formula shown in formula (I):

[0009] ;

[0010] In the formula, R is a C1~C4 hydrocarbon group, , or ;M is Na + or K + or NH4 + .

[0011] The design concept of the above technical solution lies in the fact that the present invention has optimized the pyrite inhibitor, utilizing the two sulfur-nitrogen functional groups in the pyrite inhibitor having the structure shown in (I), to react with the Fe exposed on the surface of pyrite, marcasite, and pyrrhotite. 2+ It produces a strong chelating effect, easily adsorbing onto the surface of pyrite minerals and occupying the active sites on the mineral surface, thus making it hydrophilic, while the metal ion interaction sites (such as Cu) exposed on the surface of other useful sulfide minerals are avoided. 2+ Pb 2+ (etc.) It readily forms stable chelates with mercapto collectors and is not easily replaced or substituted by disulfide nitrogen compounds, thereby achieving selective inhibition of pyrite and pyrrhotite.

[0012] As a further preferred embodiment of the above technical solution, in step (1), the mass ratio of the sulfide ore being ground to particles with a fineness of -200 mesh is 60%~100%.

[0013] As a further preferred embodiment of the above technical solution, the amount of pyrite inhibitor added in step (2) is 100g / t to 1000g / t.

[0014] As a further preferred embodiment of the above technical solution, the pyrite inhibitor further includes at least one selected from mercaptoacetic acid and its salts, mercaptoethanol, sodium dithiocarbamate, starch, polyacrylic acid, CMC, sodium humate, tannic acid, and quicklime. When the above substances are used in combination with the pyrite inhibitor, the pyrite inhibitor accounts for 30% to 60% of the total composition.

[0015] As a further preferred embodiment of the above technical solution, the collector includes at least one of ethyl xanthate, isopropyl xanthate, butyl xanthate, pentyl xanthate, mercaptobenzothiazole, ethyl thiocyanate, butylamine black, sodium butyl black, and Z-200; the amount of the collector added is 10 g / t to 500 g / t.

[0016] As a further preferred embodiment of the above technical solution, the foaming agent includes at least one of No. 2 oil, MIBC, BK206 and DF-1012; the amount of foaming agent added is 10g / t to 200t / g.

[0017] As a further preferred embodiment of the above technical solution, in step (2), a pH adjuster is used to adjust the pH value of the slurry to 8-14.

[0018] As a further preferred embodiment of the above technical solution, the pH adjuster includes at least one of lime, sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium bicarbonate.

[0019] As a further preferred embodiment of the above technical solution, the sulfide ore includes at least one of copper sulfide ore, molybdenum bismuth sulfide ore, sphalerite, galena, and antimony sulfide ore.

[0020] The present invention has the following beneficial effects:

[0021] The flotation method of this invention preferably uses a pyrite depressant. This depressant can be widely used to suppress pyrite, marcasite, and pyrrhotite in copper-sulfur separation, lead-zinc-sulfur separation, and lead-antimony, molybdenum-bismuth, and sulfur separation. Its molecular structure contains disulfide nitrogen groups that readily react with the Fe atoms exposed on the surface of pyrite and pyrrhotite. 2+ It produces a strong selective chelation effect, occupies the reactive sites on the mineral surface, making them hydrophilic, thereby exerting a strong inhibitory effect on pyrite and pyrrhotite. It is characterized by small dosage, non-toxicity and environmental friendliness, and can replace sodium cyanide. At the same time, it can effectively solve the problem of excessively high pulp pH and low separation efficiency caused by the large use of lime, which is conducive to improving the grade of the target mineral concentrate and the flotation recovery rate. Attached Figure Description

[0022] Figure 1 The infrared spectrum of the pyrite inhibitor (sodium ethylene dithiocarbamate, abbreviated as SDDC) in Example 1 is shown.

[0023] Figure 2 The infrared spectrum of the pyrite inhibitor (sodium thiourea dithiocarbamate, abbreviated as STDC) in Example 2 is shown.

[0024] Figure 3 The above are process flow diagrams of the flotation methods for Examples 1-3, Examples 5-7, Comparative Example 1, and Comparative Example 3.

[0025] Figure 4 This is a closed-loop process flow diagram of the flotation methods in Example 4 and Comparative Example 2.

[0026] Figure 5 This is a closed-loop process flow diagram of the flotation methods in Example 8 and Comparative Example 4. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0028] Example 1:

[0029] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 3As shown, the flotation roughing method for copper sulfide ore (containing 0.72% Cu and 11.20% S, with main metallic minerals including pyrite, chalcopyrite, chalcocite, chalcocite, bornite, covellite, arsenite, chalcopyrite, sphalerite, native copper, etc., and gangue minerals mainly including quartz, garnet, calcite, feldspar, and kaolinite, etc.) includes the following steps:

[0030] (1) Grind the copper sulfide ore until the particle size of -200 mesh is 75% to obtain a slurry;

[0031] (2) The pH of the slurry was adjusted to 8.20 using sodium carbonate (1000 g / t). Then, pyrite inhibitor (150 g / t), collector (pentyl xanthate, 70 g / t), and frother (2# oil, 20 g / t) were added to the slurry in sequence for flotation to obtain rough concentrate and tailings. The pyrite inhibitor was SDDC, and its chemical structural formula was: Its infrared spectrum is as follows Figure 1 As shown.

[0032] Example 2:

[0033] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 3 As shown, the flotation roughing method for copper sulfide ore (containing 0.72% Cu and 11.20% S, with main metallic minerals including pyrite, chalcopyrite, chalcocite, chalcocite, bornite, covellite, arsenite, chalcopyrite, sphalerite, native copper, etc., and gangue minerals mainly including quartz, garnet, calcite, feldspar, and kaolinite, etc.) includes the following steps:

[0034] (1) Grind the copper sulfide ore until the particle size of -200 mesh is 75% to obtain a slurry;

[0035] (2) The pH of the slurry was adjusted to 8.60 using sodium carbonate (1500 g / t). Then, pyrite inhibitor (100 g / t), collector (amyl xanthate, 80 g / t), and frother (2# oil, 20 g / t) were added to the slurry in sequence for flotation to obtain rough concentrate and tailings. The pyrite inhibitor was STDC, and its chemical structural formula was: Its infrared spectrum is as follows Figure 2 As shown.

[0036] Example 3:

[0037] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 3As shown, the flotation roughing method for copper sulfide ore (containing 0.72% Cu and 11.20% S, with main metallic minerals including pyrite, chalcopyrite, chalcocite, chalcocite, bornite, covellite, arsenite, chalcopyrite, sphalerite, native copper, etc., and gangue minerals mainly including quartz, garnet, calcite, feldspar, and kaolinite, etc.) includes the following steps:

[0038] (1) Grind the copper sulfide ore until the particle size of -200 mesh is 75% to obtain a slurry;

[0039] (2) Use sodium carbonate (1200g / t) to adjust the pH of the slurry to 8.40, and then add pyrite inhibitor (120g / t), collector (pentyl xanthate, 70g / t), and frother (2# oil, 20g / t) to the slurry in sequence for flotation to obtain rough concentrate and tailings; the pyrite inhibitor is QY-1 (sodium mercaptoacetate: SDDC=2:1, mass ratio).

[0040] Comparative Example 1:

[0041] The flotation method for sulfide ores in this comparative example is shown in the process flow diagram below. Figure 3 As shown, the flotation roughing method for copper sulfide ore (containing 0.72% Cu and 11.20% S, with main metallic minerals including pyrite, chalcopyrite, chalcocite, chalcocite, bornite, covellite, arsenite, chalcopyrite, sphalerite, native copper, etc., and gangue minerals mainly including quartz, garnet, calcite, feldspar, and kaolinite, etc.) includes the following steps:

[0042] (1) Grind the copper sulfide ore until the particle size of -200 mesh is 75% to obtain a slurry;

[0043] (2) Add calcium oxide (4000g / t) as a pyrite inhibitor to the slurry. At this time, the pH value of the slurry is 11.00. Then add the collector (pentyl xanthate, 80g / t) and the frother (2# oil, 20g / t) to the slurry in sequence. Perform flotation to obtain rough concentrate and tailings.

[0044] The flotation comparison results of Examples 1, 2, and 3 with Comparative Example 1 are shown in Table 1. As can be seen from Table 1, the Cu grade in the copper concentrate obtained by SDDC is 6.95 percentage points higher than that obtained by CaO, while the S grade is 4.29 percentage points lower; the Cu grade in the copper concentrate obtained by STDC is 6.90 percentage points higher than that obtained by CaO, while the S grade is 7.06 percentage points lower; the Cu grade in the copper concentrate obtained by QY-1 is 7.93 percentage points higher than that obtained by CaO, while the S grade is 7.18 percentage points lower. The SDDC inhibitor and its combination with sodium thioglycolate, the inhibitor QY-1, show better inhibitory effects on pyrite than the CaO inhibitor, and the inhibitor described in this patent, when used in combination with conventional inhibitors, exhibits even better results.

[0045] Table 1. Flotation comparison experiment results of each embodiment and comparative example.

[0046]

[0047] Example 4:

[0048] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 4 As shown, a flotation process for copper sulfide ore (containing 0.72% Cu and 11.20% S, with main metallic minerals including pyrite, chalcopyrite, chalcocite, chalcocite, bornite, covellite, arsenicite, chalcopyrite, sphalerite, native copper, etc., and gangue minerals mainly including quartz, garnet, calcite, feldspar, and kaolinite, etc.) is employed, consisting of one roughing, two cleaning, and one scavenging flotation, and includes the following steps:

[0049] (1) Grind the copper sulfide ore until the particle size of -200 mesh is 75% to obtain a slurry;

[0050] (2) Use sodium carbonate (1000g / t) to adjust the pH of the slurry to 8.20, and then add pyrite inhibitor (150g / t), collector (pentyl xanthate, 70g / t), and frother (2# oil, 20g / t) to the slurry in sequence to carry out flotation roughing operation to obtain rough concentrate and roughing tailings; the pyrite inhibitor is SDDC.

[0051] (3) The copper rough concentrate is processed through two copper beneficiation processes to obtain copper concentrate. The rough tailings are processed through copper scavenging (with the addition of pentyl xanthate at a dosage of 50 g / t) to obtain scavenged concentrate and scavenged tailings. The scavenged concentrate is returned to the slurry in step (2). The scavenged tailings are subjected to a sulfur flotation process of one roughing, two beneficiation and one scavenging (for sulfur roughing, activator copper sulfate 800 g / t, collector pentyl xanthate 120 g / t, frother 40 g / t, and sulfur scavenging, pentyl xanthate 20 g / t is added) to obtain sulfur concentrate. The copper grade of the copper concentrate is 21.09% and the copper recovery rate is 82.02%. The sulfur grade of the sulfur concentrate is 40.00% and the sulfur recovery rate is 90.50%.

[0052] Comparative Example 2:

[0053] The flotation method for sulfide ores in this comparative example differs from that in Example 4 in that, in step (2), calcium oxide is used as a pyrite inhibitor instead of SDDC, while the other flotation processes and conditions are the same as in Example 4.

[0054] The results of the flotation comparison tests of Example 4 and Comparative Example 2 are shown in Table 2. As can be seen from Table 2, compared with calcium oxide, under the same flotation process, SDDC increases the Cu grade in copper concentrate by 5.70 percentage points, increases the Cu recovery rate by 4.00 percentage points, and decreases the S grade by 4.85 percentage points in copper concentrate. In contrast, SDDC increases the S grade in sulfur concentrate by 4.16 percentage points and increases the recovery rate by 8.30 percentage points. Therefore, SDDC has a stronger selective inhibition ability against sulfide ore than calcium oxide.

[0055] Table 2. Flotation comparison experimental results of Example 4 and Comparative Example 2

[0056]

[0057] Example 5:

[0058] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 3 As shown, the flotation roughing method for molybdenum-bismuth sulfide ore (containing 2.10% Mo, 3.65% Bi, and 31.05% S, with metallic minerals mainly consisting of molybdenite, bismuthite, pyrite, chalcopyrite, and galena, and non-metallic minerals mainly consisting of quartz, garnet, fluorite, mica, and calcite) includes the following steps:

[0059] (1) The molybdenum bismuth sulfide ore is ground until the particle size of -200 mesh is 85% to obtain a slurry;

[0060] (2) Use calcium oxide (800g / t) to adjust the pH of the slurry to 7.98, and then add pyrite inhibitor (150g / t), collector (ethyl thiocyanate, 25g / t), and frother (2# oil, 20g / t) to the slurry in sequence for flotation to obtain rough concentrate and tailings; the pyrite inhibitor is SDDC.

[0061] Example 6:

[0062] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 3 As shown, the flotation roughing method for molybdenum-bismuth sulfide ore (containing 2.10% Mo, 3.65% Bi, and 31.05% S, with metallic minerals mainly consisting of molybdenite, bismuthite, pyrite, chalcopyrite, and galena, and non-metallic minerals mainly consisting of quartz, garnet, fluorite, mica, and calcite) includes the following steps:

[0063] (1) The molybdenum bismuth sulfide ore is ground until the particle size of -200 mesh is 85% to obtain a slurry;

[0064] (2) Use calcium oxide (1000g / t) to adjust the pH of the slurry to 8.54, and then add pyrite inhibitor (150g / t), collector (ethyl nitrogen + Z-200, mass ratio 1:1, dosage 25g / t) and frother (2# oil, dosage 20g / t) to the slurry in sequence to carry out flotation operation to obtain rough concentrate and tailings; the pyrite inhibitor is STDC.

[0065] Example 7:

[0066] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 3 As shown, the flotation roughing method for molybdenum-bismuth sulfide ore (containing 2.10% Mo, 3.65% Bi, and 31.05% S, with metallic minerals mainly consisting of molybdenite, bismuthite, pyrite, chalcopyrite, and galena, and non-metallic minerals mainly consisting of quartz, garnet, fluorite, mica, and calcite) includes the following steps:

[0067] (1) The molybdenum bismuth sulfide ore is ground until the particle size of -200 mesh is 85% to obtain a slurry;

[0068] (2) Use calcium oxide (900g / t) to adjust the pH of the slurry to 8.25, and then add pyrite inhibitor (120g / t), collector (ethyl thiocyanate + Z-200, mass ratio 1:1, 25g / t) and frother (2# oil, 20g / t) to the slurry in sequence for flotation to obtain rough concentrate and tailings; the pyrite inhibitor is QY-2 (sodium humate: SDDC=2:1, mass ratio).

[0069] Comparative Example 3:

[0070] The flotation method for sulfide ores in this comparative example is shown in the process flow diagram below. Figure 3 The flotation roughing method shown is used for molybdenum-bismuth sulfide ore (containing 2.10% Mo, 3.65% Bi, and 31.05% S; the main metallic minerals in the ore sample are molybdenite, bismuthite, pyrite, chalcopyrite, and galena, while the main non-metallic minerals are quartz, garnet, fluorite, mica, and calcite). The method includes the following steps:

[0071] (1) The molybdenum bismuth sulfide ore is ground until the particle size of -200 mesh is 85% to obtain a slurry;

[0072] (2) Add sodium cyanide (4200 g / t) as a pyrite inhibitor to the slurry. At this time, the pH value of the slurry is 11.54. Then add collector (ethyl thiocyanate + Z-200, mass ratio 1:1, dosage 25 g / t) and frother (2# oil, dosage 20 g / t) to the slurry in sequence. Perform flotation to obtain rough concentrate and tailings.

[0073] The flotation comparison results of Examples 5, 6, and 7 with Comparative Example 3 are shown in Table 3. As can be seen from Table 3, the Mo and Bi grades in the molybdenum-bismuth rough concentrate obtained by DDC were 0.37 and 0.45 percentage points higher, respectively, than those obtained by sodium cyanide, while the S grade decreased by 9.15 percentage points. The Mo and Bi grades in the molybdenum-bismuth rough concentrate obtained by STDC were 0.52 and 0.38 percentage points higher, respectively, than those obtained by sodium cyanide, while the S grade decreased by 12.15 percentage points. The Mo and Bi grades in the molybdenum-bismuth rough concentrate obtained by QY-2 were 0.77 and 0.87 percentage points higher, respectively, than those obtained by sodium cyanide, while the S grade decreased by 12.93 percentage points. It is evident that SDDC, STDC, and QY-2 have better inhibitory effects on pyrite than the sodium cyanide inhibitor, and the inhibitor described in this patent, when used in combination with conventional inhibitors, has even better results.

[0074] Table 2. Results of flotation comparison experiments in Examples 5, 6, 7 and Comparative Example 3

[0075]

[0076] Example 8:

[0077] The flotation method for sulfide ore in this embodiment is illustrated in the process flow diagram below. Figure 5 As shown, this process is used for flotation of lead-zinc sulfide ore (Pb 2.30%, Zn 1.65%, S 7.89%, Fe 8.17%, with metallic minerals mainly including pyrite, galena, sphalerite, and minor amounts of chalcopyrite, pyrrhotite, magnetite, etc., and non-metallic minerals mainly including carbonate minerals, quartz, muscovite, etc.). The flotation process adopts a lead-zinc-sulfur mixed flotation-preferential lead flotation-zinc-sulfur separation process. The lead-zinc-sulfur mixed flotation adopts a process of one roughing, three cleaning, and three scavenging. The lead-zinc-sulfur mixed concentrate preferential lead flotation closed-circuit test adopts a process of one roughing, three cleaning, and two scavenging. The lead tailings after preferential lead flotation are subjected to zinc-sulfur separation, adopting a process of one roughing, three cleaning, and two scavenging.

[0078] Comparative Example 4:

[0079] The flotation method for sulfide ores in this comparative example differs from that in Example 8 in that sodium cyanide is used as a pyrite depressant instead of STDC, while the other flotation processes and conditions are the same as in Example 8.

[0080] The flotation comparison results of Example 8 and Comparative Example 4 are shown in Table 4. Table 4 shows that compared with sodium cyanide, STDC increased the Pb grade in lead concentrate by 3.08 percentage points, while decreasing the Zn and S grades by 0.68 and 2.83 percentage points, respectively; STDC increased the Zn grade in zinc concentrate by 6.16 percentage points, while decreasing the Pb and S grades by 0.68 and 1.04 percentage points, respectively; and STDC increased the S grade in sulfur concentrate by 4.89 percentage points, with a S recovery rate increase of 4.90 percentage points. Therefore, STDC exhibits significantly better selective inhibition of pyrite than sodium cyanide inhibitors.

[0081] Table 4. Flotation comparison experiment results of Example 8 and Comparative Example 4

[0082]

[0083] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the inventive concept should also be considered within the scope of protection of the present invention.

[0084] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flotation method for sulfide ores, characterized in that, Includes the following steps: (1) The sulfide ore is ground to a certain fineness to obtain a slurry; (2) Adjust the pH value of the slurry, and then add pyrite inhibitor, collector, and frother to the slurry in sequence to carry out flotation to obtain concentrate and tailings; the pyrite inhibitor includes substances with the chemical structural formula shown in formula (I): ； In the formula, R is a C1~C4 hydrocarbon group; M is Na + or K + or NH4 + .

2. The flotation method for sulfide ores according to claim 1, characterized in that, In step (1), the mass ratio of the sulfide ore to particles with a fineness of -200 mesh is 60%~100%.

3. The flotation method for sulfide ores according to claim 1, characterized in that, The amount of pyrite inhibitor added in step (2) is 100g / t to 1000g / t.

4. The flotation method for sulfide ores according to claim 1, characterized in that, The pyrite inhibitor described in step (2) also includes at least one of mercaptoacetic acid and its salts, mercaptoethanol, sodium dithiocarbamate, starch, polyacrylic acid, CMC, sodium humate, tannic acid and quicklime.

5. The flotation method for sulfide ores according to any one of claims 1 to 4, characterized in that, The collector includes at least one of ethyl xanthate, isopropyl xanthate, butyl xanthate, pentyl xanthate, mercaptobenzothiazole, ethyl thiocyanate, butylamine black, sodium butyl black, and Z-200; the amount of the collector added is 10 g / t to 500 g / t.

6. The flotation method for sulfide ores according to any one of claims 1-4, characterized in that, The foaming agent includes at least one of No. 2 oil, MIBC, BK206 and DF-1012; the amount of foaming agent added is 10g / t to 200t / g.

7. The flotation method for sulfide ores according to any one of claims 1 to 3, characterized in that, In step (2), the pH value of the slurry is adjusted to 8-14 using a pH adjuster.

8. The flotation method for sulfide ores according to claim 7, characterized in that, The pH adjuster includes at least one of lime, sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium bicarbonate.

9. The flotation method for sulfide ores according to any one of claims 1-4, characterized in that, The sulfide minerals include at least one of copper sulfide minerals, molybdenum bismuth sulfide minerals, sphalerite, galena, and antimony sulfide minerals.

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