Study On Flotation Effect And Mechanism Of Emulsion Particle Collector On Chalcopyrite And Serpentine

Flotation recycling of fine-grained minerals has always been an important research direction in the field of beneficiation.The copper ore resources are decreasing day by day,making the low-grade and difficult-to-treat fine-grain serpentine-type copper ores need to be further developed and utilized.In the grinding process,serpentine is easy to over-grind to form fine mud,and the positively charged hydrophilic serpentine is easy to cover the surface of fine-grained chalcopyrite by electrostatic action,further reducing the chalcopyrite surface hydrophobicity,resulting in Copper recovery rate is reduced.The emulsion particles synthesized by the emulsion polymerization method have better hydrophobic properties and controllable chargeability,which provides the possibility for effective separation of chalcopyrite and serpentine.In this paper,two types of collectors,butyl methacrylate emulsion particles and 1-vinylimidazole emulsion particles,were synthesized by emulsion polymerization.The results are as follows:The butyl methacrylate series emulsion particles are prepared by cationic surfactant-free emulsion polymerization,and the 1-vinylimidazole type emulsion particles are prepared by monomer-starved semi-batch emulsion polymerization.The settling time and centrifugal treatment time have no effect on the emulsion turbidity.Under the influence of different pH,the emulsion particle diameter changes little and has better emulsion stability.Scanning electron microscope shows that the emulsion particle shape is complete and the synthesis effect is better.In the weak alkali environment,the emulsion particles have the best flotation recovery effect for fine-grained chalcopyrite,and the collection ability of serpentine is poor;the pure mineral mixed ore test was carried out under the condition of pH=8 and optimal dosage,PS-PB1,PS-PB2 and SVM-2 have a good effect on the separation of chalcopyrite and serpentine.The recovery rates of MgO in copper concentrate are 4.86%,6.22%and 9.34%respectively,and the separation effect is remarkable.Each emulsion particle collector is a low-energy surface;?^AB_SWA is far less than zero,the emulsion particle agent has a strong hydrophobic force;the emulsion particles and chalcopyrite have electrostatic attraction,and each hydrophobic attraction energy is better than each van der Huaneng is an order of magnitude larger,indicating that the leading role is the hydrophobic attraction energy,which is the performance of the hydrophobicity of the emulsion particle collector.The contact angle of emulsion particles on the surface of chalcopyrite ranges from 106.7°⁷7.5°,and the contact angles of the three emulsion particles of PS-PB,PS-PB1 and SVM-2 on the surface of chalcopyrite are all greater than 90°,which are strongly hydrophobic particles.The two types of emulsion particles are cationic,the isoelectric point of chalcopyrite is 5.3,PS-PB,PS-PB1,SVM-2 agents become 6.32,6.13,6.51 after the action of the agent.The change of contact angle and potential is related to the surface modification components added to the emulsion particles.There are amide cations on the surface of the butyl methacrylate emulsion particles;1-vinylimidazole agent surface charged groups:the amide group contained in the initiator V₅₀,The quaternary ammonium group of imidazole group and monomer MAPTAC affects the charge and wettability of the emulsion particle surface.Through the adsorption capacity test and scanning electron microscopy under copper concentrate,it was found that the two types of emulsion particles adsorbed more on the surface of chalcopyrite and less on the serpentine surface.The emulsion particles adsorbed on the mineral particles relying on better hydrophobic force The surface increases the roughness of the surface of the mineral particles,enhances the hydrophobicity of the surface of the mineral particles,and magnifies the difference between the wettability of the mineral particle surface and the serpentine surface.Infrared spectroscopy tests show that both emulsion particles are not A new absorption peak is generated.