Flotation method for sulphide ore

Abstract

The invention discloses a sulphide ore flotation method which comprises the following steps: (1) carrying out ore grinding operation on sulphide ore to obtain ore pulp; (2) the pH value of the ore pulp is adjusted, then a pyrite inhibitor, a collecting agent and a foaming agent are sequentially added, flotation operation is conducted, and concentrate and tailings are obtained; the chemical structural formula of the pyrite inhibitor is as shown in formula (I). The flotation method preferably selects the pyrite inhibitor, can be widely applied to inhibition of pyrite, hemite and pyrrhotite in copper-sulfur separation, lead-zinc-sulfur separation and lead-antimony, molybdenum-bismuth and sulfur separation, can generate a strong inhibition effect on the pyrite and the pyrrhotite, has the characteristic of small dosage, is non-toxic and environment-friendly, can replace sodium cyanide for use, and has a wide application prospect. Meanwhile, the problems that the pH value of ore pulp is too high and the separation efficiency is low due to the fact that a large amount of lime is used can be effectively solved, and the grade and flotation recovery rate of target mineral concentrate are improved.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a flotation method for sulfide ore. Background Art

[0002] Pyrite generally refers to pyrite, marcasite and pyrrhotite, and is often used as the main mineral raw material for extracting sulfur and making sulfuric acid. Since pyrite is usually closely associated with chalcopyrite, molybdenum-bismuth sulfide ore, galena, sphalerite, antimony sulfide ore and gold and silver precious metal minerals, it is difficult to separate, which usually leads to a decrease in the grade and recovery rate of useful minerals, seriously affecting the economic benefits of mining enterprises, and also has an adverse effect on subsequent smelting links. Therefore, the development and application of efficient and selective inhibitors for pyrite is very important.

[0003] Traditional pyrite inhibitors can be mainly divided into inorganic inhibitors and organic inhibitors. Representative agents of inorganic inhibitors mainly include lime, cyanide, etc. At present, the most widely used method for inhibiting pyrite in copper-sulfur separation in copper mines is the lime method. Usually, a large amount of lime is added to inhibit pyrite minerals under high alkalinity conditions (Li Chao, Ling Shisheng. Experimental study on flotation of low-alkalinity copper-sulfur separation in a copper mine in Inner Mongolia [J]. Mining and Metallurgy, 2024, 33(1):39-45.). Although the lime method has good separation effect, it has disadvantages such as large amount of lime and easy scaling of pipelines. In addition, the pyrite that is inhibited at the back end needs to be activated with sulfuric acid (Li Guodong, Qiu Tingsheng, Guo Haining, etc. Experimental study on low-alkalinity flotation process of a complex gold-containing copper-sulfur ore [J]. Metal Mines, 2020, (11): 95-99.), which has great safety risks. In addition, in a high-alkalinity slurry environment, the associated precious metals are difficult to be comprehensively recycled, which will also make it difficult to improve the grade of copper concentrate. The separation of molybdenum and bismuth from pyrite and pyrrhotite in molybdenum-bismuth sulfide ores usually uses sodium cyanide as an inhibitor, which has a good inhibitory effect. However, sodium cyanide is a highly toxic substance and will cause serious environmental pollution. As the country pays more and more attention to mine environmental protection, the development of cyanide-free and environmentally friendly recovery 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. Industrial application of a new process for the recovery of molybdenum, bismuth and sulfide without cyanide in Shizhuyuan [J]. Mining and Metallurgical Engineering, 2022, 42(04): 82-85.). The main organic inhibitors for pyrite are glyceryl xanthate, humate, etc. He et al. studied the mechanism of action of the inhibitor sodium glyceryl xanthate (SGX) in the flotation separation of sphalerite and pyrite. The results showed that when butyl xanthate was used as a collector, sphalerite could be separated by Cu in the presence of SGX. 2+ Activated to have good floatability, while pyrite cannot be activated by Cu 2+Activation, in the range of pH 4 to 11, when the amount of SGX is less than 50 mg / L, the selective separation of the two minerals can be achieved (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 adsorbed on the surface of pyrite through physical and chemical effects at pH 8.0, enhancing the hydrophilicity of pyrite, and the macromolecular chain structure of starch covered the active metal ions on the surface of pyrite, thereby hindering the interaction between the collector and pyrite (Wei Min, Lv Jinfang, Zheng Yongxing et al. Research progress on the selective inhibition of starch on sulfide minerals and gangue minerals and its mechanism [J]. Mineral Conservation and Utilization, 2021, 41(02): 58-64.). However, existing organic depressants have poor selectivity for the separation of pyrite from useful minerals such as chalcopyrite, molybdenum bismuth ore, sphalerite, and galena. Summary of the invention

[0004] The present invention provides a flotation method for sulfide ore, which is used to solve the technical problems mentioned in the background technology that the pyrite depressant in the existing flotation process of sulfide ore is not selective and has poor use effect.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is: A sulfide ore flotation method comprises the following steps: (1) Grinding the sulfide ore to a certain fineness to obtain ore slurry; (2) adjusting the pH value of the slurry, and then sequentially adding a pyrite inhibitor, a collector, and a frother to the slurry to perform flotation operations to obtain concentrate and tailings; the pyrite inhibitor comprises a substance having a chemical structural formula as shown in formula (I): ; Where R is C 1 ~C 4 The hydrocarbon group, , or ;M is Na + or K + or NH 4 + .

[0006] The design idea of ​​the above technical solution is that the present invention optimizes the pyrite inhibitor, and utilizes 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 and is easily adsorbed on the surface of pyrite minerals, occupying the active sites on the surface of the minerals, making them hydrophilic, while other useful metal ion sites exposed on the surface of sulfide minerals (such as Cu 2+ , Pb 2+ It is easy to form a stable chelate with thiol collectors and is not easily replaced or displaced by disulfide nitrogen compounds, thus achieving the selective inhibition of pyrite and pyrrhotite.

[0007] As a further preferred embodiment of the above technical solution, in step (1), the sulfide ore is ground to a particle size of -200 mesh, and the mass proportion of the particles is 60% to 100%.

[0008] As a further preferred embodiment of the above technical solution, the amount of the pyrite inhibitor added in step (2) is 100 g / t to 1000 g / t.

[0009] As a further preferred embodiment of the above technical solution, the pyrite inhibitor further comprises at least one of thioglycolic acid and its salts, mercaptoethanol, sodium dithioaminoacetate, starch, polyacrylic acid, CMC, sodium humate, tannic acid and quicklime. When the above substances are used in combination with the pyrite inhibitor, the mass ratio of the pyrite inhibitor therein is 30% to 60%.

[0010] As a further preferred embodiment of the above technical solution, the collector includes at least one of ethyl xanthate, isopropyl xanthate, butyl xanthate, amyl xanthate, mercaptobenzothiazole, ethylthiocyanate, butylamine black medicine, sodium butyl black medicine and Z-200; the addition amount of the collector is 10g / t~500g / t.

[0011] 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; and the added amount of the foaming agent is 10g / t~200t / g.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] The present invention has the following beneficial effects: The flotation method of the present invention preferably uses a pyrite inhibitor, which can be widely used in the inhibition of pyrite, marcasite and pyrrhotite in the separation of copper and sulfur, lead, zinc and sulfur, and lead, antimony, molybdenum and bismuth from sulfur. The disulfur and nitrogen groups contained in the molecular structure of the inhibitor are easy to react with the Fe2+ exposed on the surface of pyrite and pyrrhotite. 2+ It produces a strong selective chelation effect, occupies the reactive active sites on the surface of the mineral, makes it hydrophilic, and thus has a strong inhibitory effect on pyrite and pyrrhotite. It also 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 pH value of the slurry and low sorting efficiency caused by the large amount of lime used, which is beneficial to improve the grade of the target mineral concentrate and the flotation recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an infrared spectrum of the pyrite inhibitor (sodium ethylenebisdithiocarbamate, abbreviated as SDDC) of Example 1.

[0017] Figure 2 This is an infrared spectrum of the pyrite inhibitor (sodium thiourea dithiocarbamate, referred to as STDC) of Example 2.

[0018] Figure 3 It is a process flow chart of the flotation method of Examples 1 to 3, Examples 5 to 7, Comparative Example 1 and Comparative Example 3.

[0019] Figure 4 The closed-loop process flow chart of the flotation method of Example 4 and Comparative Example 2 is shown.

[0020] Figure 5 It is a closed-loop process flow chart of the flotation method of Example 8 and Comparative Example 4. DETAILED DESCRIPTION

[0021] 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.

[0022] Embodiment 1: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 3As shown, it is used for flotation roughing of copper sulfide ore (containing Cu 0.72%, S 11.20%, main metal minerals are pyrite, chalcopyrite, chalcocite, blue chalcocite, bornite, covellite, arsenic copper ore, arsenic tetrahedrite, sphalerite, native copper, etc., and gangue minerals mainly include quartz, garnet, calcite, feldspar and kaolinite, etc.), including the following steps: (1) Grinding the copper sulfide ore until the particle size of -200 mesh accounts for 75% by mass, thereby obtaining slurry; (2) Sodium carbonate (1000 g / t) was used to adjust the pH value of the pulp to 8.20, and then pyrite inhibitor (150 g / t), collector (amyl xanthate, 70 g / t), and frother (2# oil, 20 g / t) were added to the pulp in sequence to perform flotation operations to obtain coarse concentrate and tailings; the pyrite inhibitor was SDDC, and its chemical formula is Its infrared spectrum is Figure 1 shown.

[0023] Embodiment 2: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 3 As shown, it is used for flotation roughing of copper sulfide ore (containing Cu 0.72%, S 11.20%, main metal minerals are pyrite, chalcopyrite, chalcocite, blue chalcocite, bornite, covellite, arsenic copper ore, arsenic tetrahedrite, sphalerite, native copper, etc., and gangue minerals mainly include quartz, garnet, calcite, feldspar and kaolinite, etc.), including the following steps: (1) Grinding the copper sulfide ore until the particle size of -200 mesh accounts for 75% by mass, thereby obtaining slurry; (2) Sodium carbonate (1500 g / t) was used to adjust the pH value of the slurry to 8.60, and 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 to perform flotation operations to obtain coarse concentrate and tailings; the pyrite inhibitor was STDC, whose chemical formula is Its infrared spectrum is Figure 2 shown.

[0024] Embodiment 3: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 3 As shown, it is used for flotation roughing of copper sulfide ore (containing Cu 0.72%, S 11.20%, main metal minerals are pyrite, chalcopyrite, chalcocite, blue chalcocite, bornite, covellite, arsenic copper ore, arsenic tetrahedrite, sphalerite, native copper, etc., and gangue minerals mainly include quartz, garnet, calcite, feldspar and kaolinite, etc.), including the following steps: (1) Grinding the copper sulfide ore until the particle size of -200 mesh accounts for 75% by mass, thereby obtaining slurry; (2) Sodium carbonate (1200 g / t) was used to adjust the pH value of the slurry to 8.40, and then a pyrite inhibitor (120 g / t), a collector (amyl xanthate, 70 g / t), and a frother (2# oil, 20 g / t) were added to the slurry in sequence to carry out flotation operations to obtain a coarse concentrate and tailings; the pyrite inhibitor was QY-1 (sodium thioglycolate: SDDC = 2:1, mass ratio).

[0025] Comparative Example 1: The flotation method of the sulfide ore in this comparative example is shown in the process flow chart as follows: Figure 3 As shown, it is used for flotation roughing of copper sulfide ore (containing Cu 0.72%, S 11.20%, main metal minerals are pyrite, chalcopyrite, chalcocite, blue chalcocite, bornite, covellite, arsenic copper ore, arsenic tetrahedrite, sphalerite, native copper, etc., and gangue minerals mainly include quartz, garnet, calcite, feldspar and kaolinite, etc.), including the following steps: (1) Grinding the copper sulfide ore until the particle size of -200 mesh accounts for 75% by mass, thereby obtaining slurry; (2) Calcium oxide (4000 g / t), a pyrite inhibitor, was added to the pulp. At this time, the pH value of the pulp was 11.00. Then, a collector (amyl xanthate, 80 g / t) and a frother (2# oil, 20 g / t) were added to the pulp in sequence to perform flotation operations to obtain a coarse concentrate and tailings.

[0026] The flotation comparison test results of Examples 1, 2, 3 and Comparative Example 1 are shown in Table 1. As can be seen from Table 1, the Cu grade in the copper rough concentrate obtained by SDDC is 6.95 percentage points higher than that in the rough concentrate obtained by CaO, while the S grade is reduced by 4.29 percentage points; the Cu grade in the copper rough concentrate obtained by STDC is 6.90 percentage points higher than that in the rough concentrate obtained by CaO, while the S grade is reduced by 7.06 percentage points; the Cu grade in the copper rough concentrate obtained by QY-1 is 7.93 percentage points higher than that in the rough concentrate obtained by CaO, while the S grade is reduced by 7.18 percentage points. The inhibitory effect of SDDC inhibitor and its inhibitor QY-1 used in combination with sodium thioglycolate on pyrite is better than that of CaO inhibitor, and the inhibitor described in this patent is better when used in combination with conventional inhibitors.

[0027] Table 1 Flotation comparison test results of various embodiments and comparative examples

[0028] Embodiment 4: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 4 As shown, it is used for flotation of copper sulfide ore (containing Cu 0.72%, S 11.20%, main metal minerals are pyrite, chalcopyrite, chalcocite, blue chalcocite, bornite, covellite, arsenic copper ore, arsenic tetrahedrite, sphalerite, native copper, etc., and gangue minerals are mainly quartz, garnet, calcite, feldspar and kaolinite, etc.), adopting a flotation process of one roughing, two cleaning and one scavenging, including the following steps: (1) Grinding the copper sulfide ore until the particle size of -200 mesh accounts for 75% by mass, thereby obtaining slurry; (2) Sodium carbonate (1000 g / t) was used to adjust the pH value of the slurry to 8.20, and then a pyrite inhibitor (150 g / t), a collector (amyl xanthate, 70 g / t), and a frother (2# oil, 20 g / t) were added to the slurry in sequence to carry out flotation roughing operations to obtain roughing concentrate and roughing tailings; the pyrite inhibitor was SDDC.

[0029] (3) The copper rough concentrate is subjected to two copper concentration processes to obtain copper concentrate, and the rough tailings are subjected to copper scavenging (with the addition of amyl xanthate in an amount of 50 g / t) to obtain scavenged concentrate and scavenged tailings. The scavenged concentrate is returned to the slurry of step (2), and the scavenged tailings are subjected to a roughing process, a secondary concentration and a scavenging sulfur flotation process (sulfur roughing is added with an activator copper sulfate 800 g / t, a collector amyl xanthate 120 g / t, a frother 2# oil 40 g / t, and sulfur scavenging is added with amyl xanthate 20 g / t) 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%.

[0030] Comparative Example 2: The flotation method of the sulfide ore in this comparative example is different from that in Example 4 in that in step (2), calcium oxide is used as a pyrite inhibitor instead of SDDC, and the other flotation processes and conditions are the same as those in Example 4.

[0031] The flotation comparison test results 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, the Cu grade in the copper concentrate obtained by SDDC is increased by 5.70 percentage points, the Cu recovery rate is increased by 4.00 percentage points, and the S grade is reduced by 4.85 percentage points, while the S grade in the sulfur concentrate obtained by SDDC is increased by 4.16 percentage points, and the recovery rate is increased by 8.30 percentage points. It can be seen that SDDC has a stronger ability to selectively suppress pyrite than calcium oxide.

[0032] Table 2 Flotation comparison test results of Example 4 and Comparative Example 2

[0033] Embodiment 5: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 3 As shown, it is used for flotation roughing of molybdenum-bismuth sulfide ore (containing Mo2.10%, Bi 3.65%, S 31.05%, the metal minerals in the ore sample are mainly molybdenite, bismuthite, pyrite, chalcopyrite, galena, etc., and the non-metallic minerals are mainly quartz, garnet, fluorite, mica, calcite, etc.), including the following steps: (1) grinding the molybdenum-bismuth sulfide ore until the particle size of -200 mesh accounts for 85% by mass, thereby obtaining a slurry; (2) Calcium oxide (800 g / t) was used to adjust the pH value of the slurry to 7.98, and then pyrite inhibitor (150 g / t), collector (ethyl thiocyanate, 25 g / t), and frother (2# oil, 20 g / t) were added to the slurry in sequence to carry out flotation operations to obtain coarse concentrate and tailings; the pyrite inhibitor was SDDC.

[0034] Embodiment 6: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 3 As shown, it is used for flotation roughing of molybdenum-bismuth sulfide ore (containing Mo2.10%, Bi 3.65%, S 31.05%, the metal minerals in the ore sample are mainly molybdenite, bismuthite, pyrite, chalcopyrite, galena, etc., and the non-metallic minerals are mainly quartz, garnet, fluorite, mica, calcite, etc.), including the following steps: (1) grinding the molybdenum-bismuth sulfide ore until the particle size of -200 mesh accounts for 85% by mass, thereby obtaining a slurry; (2) Calcium oxide (1000 g / t) was used to adjust the pH value of the slurry to 8.54, and then pyrite inhibitor (150 g / t), collector (ethylthiocyanate + Z-200, mass ratio of 1:1, amount of 25 g / t), and frother (2# oil, amount of 20 g / t) were added to the slurry in sequence to carry out flotation operation to obtain coarse concentrate and tailings; the pyrite inhibitor was STDC.

[0035] Embodiment 7: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 3 As shown, it is used for flotation roughing of molybdenum-bismuth sulfide ore (containing Mo2.10%, Bi 3.65%, S 31.05%, the metal minerals in the ore sample are mainly molybdenite, bismuthite, pyrite, chalcopyrite, galena, etc., and the non-metallic minerals are mainly quartz, garnet, fluorite, mica, calcite, etc.), including the following steps: (1) grinding the molybdenum-bismuth sulfide ore until the particle size of -200 mesh accounts for 85% by mass, thereby obtaining a slurry; (2) Calcium oxide (900 g / t) was used to adjust the pH value of the slurry to 8.25, and then a pyrite inhibitor (120 g / t), a collector (ethylthiocyanate + Z-200, mass ratio of 1:1, amount of 25 g / t), and a frother (2# oil, amount of 20 g / t) were added to the slurry in sequence to carry out flotation operations to obtain a coarse concentrate and tailings; the pyrite inhibitor was QY-2 (sodium humate: SDDC = 2:1, mass ratio).

[0036] Comparative Example 3: The flotation method of the sulfide ore in this comparative example is shown in the process flow chart as follows: Figure 3 The method is used for flotation roughing of molybdenum-bismuth sulfide ore (containing Mo 2.10%, Bi 3.65%, S 31.05%, the metal minerals in the ore sample are mainly molybdenite, bismuthite, pyrite, chalcopyrite, galena, etc., and the non-metallic minerals are mainly quartz, garnet, fluorite, mica, calcite, etc.), including the following steps: (1) grinding the molybdenum-bismuth sulfide ore until the particle size of -200 mesh accounts for 85% by mass, thereby obtaining a slurry; (2) Sodium cyanide (4200 g / t), a pyrite inhibitor, was added to the pulp. At this time, the pH value of the pulp was 11.54. Then, a collector (ethyl thiocyanate + Z-200, mass ratio of 1:1, dosage of 25 g / t) and a frother (2# oil, dosage of 20 g / t) were added to the pulp in sequence to carry out flotation operations to obtain coarse concentrate and tailings.

[0037] The flotation comparison test results of Examples 5, 6, and 7 with Comparative Example 3 are shown in Table 3. As can be seen from Table 3, the grades of Mo and Bi in the rough concentrate of molybdenum and bismuth obtained by DDC are 0.37 and 0.45 percentage points higher than those in the rough concentrate obtained by sodium cyanide, respectively, while the S grade is reduced by 9.15 percentage points. The grades of Mo and Bi in the rough concentrate of molybdenum and bismuth obtained by STDC are 0.52 and 0.38 percentage points higher than those in the rough concentrate obtained by sodium cyanide, respectively, while the S grade is reduced by 12.15 percentage points. The grades of Mo and Bi in the rough concentrate of molybdenum and bismuth obtained by QY-2 are 0.77 and 0.87 percentage points higher than those in the rough concentrate obtained by sodium cyanide, respectively, while the S grade is reduced by 12.93 percentage points. It can be seen that the inhibitory effect of SDDC, STDC and QY-2 on pyrite is better than that of sodium cyanide inhibitor, and the inhibitor described in this patent is better when used in combination with conventional inhibitors.

[0038] Table 2 Flotation comparison test results of Examples 5, 6, 7 and Comparative Example 3

[0039] Embodiment 8: The flotation method of sulfide ore in this embodiment has a process flow chart as shown in FIG. Figure 5 As shown, it is used for flotation of sulfide lead-zinc ore (Pb2.30%, Zn 1.65%, S 7.89%, Fe 8.17%, metal minerals mainly include pyrite, galena, sphalerite, a small amount of chalcopyrite, pyrrhotite, magnetite, etc., and non-metallic minerals mainly include carbonate minerals, quartz, muscovite, etc.). The flotation adopts the process flow of lead-zinc-sulfur mixed flotation-priority lead flotation-zinc-sulfur separation, among which the lead-zinc-sulfur mixed flotation adopts the process flow of one roughing selection, three concentrations, and three scavenging selections; the closed-circuit test of lead-zinc-sulfur mixed concentrate with priority flotation of lead adopts the process flow of one roughing selection, three concentrations, and two scavenging selections; the lead tailings after priority lead flotation are subjected to zinc-sulfur separation, and the process flow of one roughing selection, three concentrations, and two scavenging selections is adopted.

[0040] Comparative Example 4: The flotation method of the sulfide ore in this comparative example is different from that in Example 8 in that sodium cyanide is used as a pyrite inhibitor instead of STDC, and other flotation processes and conditions are the same as those in Example 8.

[0041] The flotation comparison test results of Example 8 and Comparative Example 4 are shown in Table 4. It can be seen from Table 4 that compared with sodium cyanide, the Pb grade in the lead concentrate obtained by STDC increased by 3.08 percentage points, and the Zn and S grades in the lead concentrate decreased by 0.68 and 2.83 percentage points respectively; the Zn grade in the zinc concentrate obtained by STDC increased by 6.16 percentage points, and the Pb and S grades in the zinc concentrate decreased by 0.68 and 1.04 percentage points respectively; the S grade in the sulfur concentrate obtained by STDC increased by 4.89 percentage points, and the S recovery rate increased by 4.90 percentage points. It can be seen that the selective inhibition effect of STDC on pyrite is significantly better than that of sodium cyanide inhibitor.

[0042] Table 4 Flotation comparison test results of Example 8 and Comparative Example 4

[0043] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sulfide ore flotation method, characterized in that: The following steps are involved: (1) Grinding the sulfide ore to a certain fineness to obtain ore slurry; (2) adjusting the pH value of the slurry, and then sequentially adding a pyrite inhibitor, a collector, and a frother to the slurry to perform flotation operations to obtain concentrate and tailings; the pyrite inhibitor comprises a substance having a chemical structural formula as shown in formula (I): ； Wherein R is a C1~C4 hydrocarbon group, , or ;M is Na + or K + or NH4 + .

2. The sulfide ore flotation method according to claim 1, characterized in that: In step (1), the sulfide ore is ground to a fineness of -200 mesh particles, the mass proportion of which is 60% to 100%.

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

4. The sulfide ore flotation method according to claim 1, characterized in that: The pyrite inhibitor described in step (2) further comprises at least one of thioglycolic acid and its salts, mercaptoethanol, sodium dithioaminoacetate, starch, polyacrylic acid, CMC, sodium humate, tannic acid and quicklime.

5. The sulfide ore flotation method according to any one of claims 1 to 4, characterized in that: The collector comprises at least one of ethyl xanthate, isopropyl xanthate, butyl xanthate, amyl xanthate, mercaptobenzothiazole, ethylthiocyanate, butylamine black medicine, sodium butyl black medicine and Z-200; the addition amount of the collector is 10g / t~500g / t.

6. The sulfide ore flotation method according to any one of claims 1 to 4, characterized in that: The foaming agent includes at least one of 2# oil, MIBC, BK206 and DF-1012; the added amount of the foaming agent is 10g / t~200t / g.

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

8. The sulfide ore flotation method 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 sulfide ore flotation method according to any one of claims 1 to 4, characterized in that: The sulfide ore includes at least one of copper sulfide ore, molybdenum bismuth sulfide ore, sphalerite, galena and antimony sulfide ore.

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