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CN-121988458-A - Composite flotation agent for pyrite mine exploitation and preparation method and application thereof

CN121988458ACN 121988458 ACN121988458 ACN 121988458ACN-121988458-A

Abstract

The invention relates to the technical field of pyrite mining, in particular to a composite flotation agent for pyrite mining, a preparation method and application thereof, and the composite flotation agent comprises, by mass, 40-60 parts of ethion, 20-30 parts of sodium isopentyl xanthate, 5-10 parts of imidazole functionalized polystyrene nano-particles, 8-15 parts of sodium silicate, 2-5 parts of methyl isobutyl carbinol and 10-20 parts of deionized water. The prepared composite flotation agent has the advantages of synergistic components, high selectivity, slime resistance cover, low VOCs, stability and high efficiency, controllable process, uniform dispersion, strong product stability, suitability for industrial production, suitability for complex sulfide ore exploitation, remarkable improvement of the grade and recovery rate of the pyrite concentrate, and realization of green and high-efficiency separation.

Inventors

  • YU ZHIRONG
  • XU YANFEI
  • CHEN QIANZHONG
  • WANG WEI
  • LAI GUOWANG
  • GUO XUDONG
  • YOU JINHONG
  • YANG ZAIZHONG

Assignees

  • 广东广业云硫矿业有限公司

Dates

Publication Date
20260508
Application Date
20260402

Claims (10)

  1. 1. The composite flotation agent for pyrite mining is characterized by comprising, by mass, 40-60 parts of ethine, 20-30 parts of sodium isopentyl xanthate, 5-10 parts of imidazole functionalized polystyrene nanoparticles, 8-15 parts of water glass, 2-5 parts of methyl isobutyl carbinol and 10-20 parts of deionized water.
  2. 2. The composite flotation agent for pyrite mining according to claim 1, wherein the particle size of imidazole functionalized polystyrene nano-particles is 50-200 nm, and the grafting amount of imidazole is more than or equal to 0.5mmol/g.
  3. 3. A method for preparing a composite flotation agent for pyrite mining according to any of the claims 1-2, characterized in that it comprises the following steps: S1, preparing imidazole functionalized polystyrene nano-particles; S2, mixing the imidazole functionalized polystyrene nano-particles in the S1 with deionized water and sodium carboxymethyl cellulose, and uniformly stirring to obtain nano-dispersion; S3, adding ethionamide and sodium isopentyl xanthate into the nano dispersion liquid of the S2, and heating and stirring to obtain a compound; and S4, cooling the compound of the S3, adding water glass and methyl isobutyl carbinol, uniformly stirring, adjusting the pH value, aging, and filtering to obtain the compound flotation agent.
  4. 4. The method for preparing the composite flotation agent for pyrite mining according to claim 3, wherein in S1, the preparation of the imidazole functionalized polystyrene nano-particles comprises the following steps: S1.1, mixing styrene and divinylbenzene, adding deionized water and an emulsifying agent, adding an initiator in a hot water bath, and performing emulsion polymerization reaction to obtain polystyrene microsphere emulsion; S1.2, dispersing the polystyrene microsphere emulsion obtained in the step S1.1 in methylene dichloride, adding chloromethyl methyl ether and anhydrous zinc chloride, and carrying out modification reaction to obtain chloromethylated polystyrene microspheres; S1.3, dispersing the chloromethylated polystyrene microsphere obtained in the S1.2 in dimethylformamide, adding imidazole and potassium carbonate to carry out nucleophilic substitution reaction, and after the reaction is finished, sequentially washing, soxhlet extracting and vacuum drying reaction products to obtain the imidazole functionalized polystyrene nanoparticle.
  5. 5. The preparation method of the composite flotation agent for pyrite mining according to claim 4, wherein in S1.1, the mass ratio of styrene to divinylbenzene is (5-10): 1, the temperature of a hot water bath is 70-80 ℃, and emulsion polymerization is carried out for 8-12 hours.
  6. 6. The preparation method of the composite flotation agent for pyrite mining is characterized in that in S1.2, the modification reaction is carried out for 8-12 hours at 40-50 ℃, and in S1.3, the mass ratio of imidazole, potassium carbonate and chloromethylated polystyrene microspheres is 1 (0.67-1): 2-5, and the nucleophilic substitution reaction is carried out for 12-24 hours at 80-100 ℃.
  7. 7. The preparation method of the composite flotation agent for pyrite mining is characterized in that in S2, the mass ratio of imidazole functionalized polystyrene nano-particles to deionized water to sodium carboxymethylcellulose is 1 (1.25-4) (0.005-0.01), and stirring is carried out for 25-35 min under the conditions of 40-50 ℃ and 300-500 r/min.
  8. 8. The preparation method of the composite flotation agent for pyrite mining according to claim 3, wherein in S3, the temperature is raised to 55-65 ℃ by heating and stirring, and the stirring is carried out for 35-45 min under the condition of 400-600 r/min.
  9. 9. The method for preparing the composite flotation agent for pyrite mining according to claim 3, wherein in S4, the pH is adjusted to 8.0-9.0 by using sodium carbonate or sodium hydroxide, and the aging is standing and aging for 30min.
  10. 10. The use of a compound flotation agent for the mining of pyrite ores according to any of claims 1-2, characterized in that it is applied to the mining of complex sulphide ores containing high pyrite, pyrrhotite, serpentine, gangue of high silicates or marbleite.

Description

Composite flotation agent for pyrite mine exploitation and preparation method and application thereof Technical Field The invention relates to the technical field of pyrite mining, in particular to a composite flotation agent for pyrite mining and a preparation method and application thereof. Background The pyrite is an important sulfur resource mineral, is widely applied to the fields of sulfuric acid preparation, chemical raw material production and the like, and is often associated with pyrrhotite, serpentine, silicate gangue, sphalerite and the like in complex sulfide ore deposits. The traditional pyrite flotation agent has the core problems of poor selectivity, weak anti-interference capability, insufficient environmental protection and the like, and severely restricts the efficient separation of complex pyrite. The existing xanthate collecting agent commonly used in industry has strong collecting capability, but has low selectivity on pyrrhotite and silicate gangue, is easy to cause ore concentrate grade to slide down, most of conventional foaming agents are high-VOCs substances, have pungent smell and large environmental pollution, and aiming at complex ore samples containing serpentine and ore slime, the conventional agent is easy to be influenced by a mud cover, and the recovery rate of refractory pyrite is low. The single flotation reagent is difficult to meet multiple requirements of collection, inhibition, mud resistance, environmental protection and the like, and the compound reagent often has the defects of poor component compatibility, weak synergistic effect, insufficient stability and the like. Meanwhile, the existing flotation agent cannot realize the efficient separation of pyrite and associated minerals under the interference of high silicate gangue and pyrrhotite, so that the resource utilization rate is low, the tailing loss is serious, and the development trend of green mining and efficient mineral separation is not met. Disclosure of Invention The invention aims to provide a compound flotation agent for pyrite mine exploitation, a preparation method and application thereof, which solve the problems of poor selectivity, weak mud resistance, insufficient environmental protection and poor suitability of complex minerals of the pyrite flotation agent in the prior art, and the prepared compound flotation agent has the advantages of synergistic components, high selectivity, mud resistance cover, low VOCs, stability and high efficiency, controllable process, uniform dispersion, strong product stability, suitability for industrial production, suitability for complex sulfide ore exploitation, remarkable improvement of the grade and recovery rate of pyrite concentrate, and realization of green and high-efficiency separation. The invention provides a composite flotation agent for pyrite mining, which comprises, by mass, 40-60 parts of ethion, 20-30 parts of sodium isopentyl xanthate, 5-10 parts of imidazole functionalized polystyrene nanoparticles, 8-15 parts of sodium silicate, 2-5 parts of methyl isobutyl carbinol and 10-20 parts of deionized water. Preferably, the particle size of the imidazole functionalized polystyrene nano-particles is 50-200 nm, and the imidazole grafting amount is more than or equal to 0.5mmol/g. The preparation method of the composite flotation agent for pyrite mining comprises the following steps: S1, preparing imidazole functionalized polystyrene nano-particles; S2, mixing the imidazole functionalized polystyrene nano-particles in the S1 with deionized water and sodium carboxymethyl cellulose, and uniformly stirring to obtain nano-dispersion; S3, adding ethionamide and sodium isopentyl xanthate into the nano dispersion liquid of the S2, and heating and stirring to obtain a compound; and S4, cooling the compound of the S3, adding water glass and methyl isobutyl carbinol, uniformly stirring, adjusting the pH value, aging, and filtering to obtain the compound flotation agent. Preferably, in S1, the preparation of the imidazole-functionalized polystyrene nanoparticle comprises the following steps: S1.1, mixing styrene and divinylbenzene, adding deionized water and an emulsifying agent, adding an initiator in a hot water bath, and performing emulsion polymerization reaction to obtain polystyrene microsphere emulsion; S1.2, dispersing the polystyrene microsphere emulsion obtained in the step S1.1 in methylene dichloride, adding chloromethyl methyl ether and anhydrous zinc chloride, and carrying out modification reaction to obtain chloromethylated polystyrene microspheres; S1.3, dispersing the chloromethylated polystyrene microsphere obtained in the S1.2 in dimethylformamide, adding imidazole and potassium carbonate to carry out nucleophilic substitution reaction, and after the reaction is finished, sequentially washing, soxhlet extracting and vacuum drying reaction products to obtain the imidazole functionalized polystyrene nanoparticle. Preferably, in S1.1, the mass ratio