Experimental And Mechanism Study On Nanoparticle Reinforced Recovery Of Fine-Grained Chalcopyrite And Pyrite In The Presence Of Serpentine

Magnesium-containing silicate minerals are common gangue minerals in copper sulphide ore.Some magnesium-containing silicate minerals have high zero point,soft texture and easy muddy.In the weak alkaline pH range commonly used in sulfide ore flotation,the surface of these magnesium-containing silicate minerals is positively charged,while the surface of the sulfide minerals is negatively charged,and sulfurized minerals is covered by the hydrophilic magnesium-containing silicate slime through electrostatic action.The surface hydrophobicity of the sulfide mineral is reduced.This paper is aimed at the phenomenon of floatation inhibition of sulfide ore by magnesium-containing silicate.The new type of nanoparticle is used as the mixed sulfide ore collector,and the selective adsorption and strong hydrophobicity of the sulfide ore by the nanoparticles are used to enhance the floatability of the sulfide ore.The main results of the study are as follows:(1)In this paper,ten kinds of products are obtained by changing the mixing ratio of styrene and butyl acrylate by emulsion polymerization.Through the observation of morphology and its influence on the floatability of chalcopyrite,the NC3,NC4 and NC7 nanoparticles were obtained for subsequent experiments,and the infrared detection and stability of these three nanoparticles were studied.(2)After studying the floatability of four minerals,it is found that chalcopyrite is very buoyant in the whole pH range;pyrite is very buoyant under acidic and weakly alkaline conditions,and floatable under alkaline conditions.Chlorite and serpentine are very poorly floatable.Serpentine and chalcopyrite(and pyrite)are prone to agglomeration and seriously affect the floatability of chalcopyrite and pyrite.There is basically no agglomeration between chlorite and chalcopyrite and pyrite,and it does not affect the floatability of the two sulfide ore.(3)Flotation experiments were carried out on three kinds of nanoparticles for serpentine,chalcopyrite and pyrite pure minerals and their mixed ore.The results show that compared with butyl sodium xanthate,the four collectors have poor collection of serpentine,and have good collection properties for both sulfides.When the slurry pH=12 and NC3 is used as the collector,the recovery rate of chalcopyrite and serpentine mixed ore is increased by 31.2%,and the recovery rate of pyrite and serpentine mixed ore is increased by 16.78%.When the slurry pH=12 and NC4 is used as the collector,the recovery rate of the chalcopyrite and serpentine mixed ore is increased by 43.16%,and there is no strengthening effect on the pyrite and serpentine mixed ore.When the slurry pH=12 and NC7 is used as the collector,the recovery rate of the chalcopyrite and serpentine mixed ore is increased by 29.78%,and there is no strengthening effect on the pyrite and serpentine mixed ore.(4)Through infrared spectroscopy and adsorption test,it was found that the three nanoparticles were chemisorbed on the surface of chalcopyrite and pyrite,but not on the surface of serpentine.Through the contact angle test,it is found that the surface contact angles of chalcopyrite and pyrite will increase greatly compared with butyl sodium xanthate after the interaction of three kinds of nanoparticles and minerals,while the surface contact angle of serpentine is basically unchanged.It can be seen from scanning electron microscopy that the three nanoparticles are well adsorbed on the surface of chalcopyrite and pyrite.