Effect Of Ultrasonic On The Properties Of Collector Solution And Its Adsorption On The Surface Of Scheelite,Fluorite And Calcite

The scheelite has similar surface chemical dissolution characteristics to the calcium-containing minerals,making it difficult to separate.Ultrasonic waves have characteristics such as cavitation,mechanical and thermal effects,which can change the properties of the solution,the microstructure and the surface properties of the mineral.Under ultrasonic conditions,this paper regards scheelite,fluorite and calcite as the object of study,explore the mechanism of action of ultrasonic on minerals and collectors and provide the theoretical basis for ultrasonic enhancing scheelite flotation by studying the solution properties,microstructure and single-float flotation characteristics of the anion collector(sodium oleate,naphthenic acid),cation collector(dodecylamine,CTAB),chelating agent(benzoic acid,salicyl hydroxamic acid).research results are as follows:(1)The research on the action of ultrasonic about the properties of collector solution(conductivity,surface tension,dissolved oxygen content and critical micelle concentration)was carried out.The effect of ultrasonic waves increases the conductivity of the collector solution,decreases the surface tension and dissolved oxygen,and increases the critical micelle concentration of the anionic collector solution.Ultrasonic cavitation induces the formation of polar ions,promotes the dissociation of collector molecules in solution,and leads to the increase in the conductivity of the solution.Ultrasonic waves destroy the equilibrium between molecules in the solution,and the hydration weakens,resulting in the decrease in surface tension.The high-temperature and high-pressure environment generated by the ultrasonic action causes the oxygen in the solution to be supersaturated and escaped,resulting in the decrease in dissolved oxygen.(2)The effect of ultrasonic on the microstructure of the collector was observed by TEM,and the mechanism of the presence of the collector in the solution and the regulation mechanism of the aggregate structure were revealed.When the concentration of the anion and cation collector solution is less than the critical micelle concentration,the ultrasonic wave can change its existence form and aggregation state;when the concentration is greater than the critical micelle concentration,the ultrasonic wave only changes its aggregation state.When the chelating collector solution is at a lower concentration,the ultrasonic wave can change its existence form and aggregation state;at a higher concentration,the ultrasonic wave only changes its aggregation state.(3)By changing the ultrasonic wave acting on the collector solution,mineral,mixed system of mineral with collector,the flotation behavior of scheelite,fluorite and calcite and its adsorption characteristics with collector by different ultrasonic modes were investigated.The collector solution have been treated by means of ultrasonic wave,after which has action with scheelite,fluorite,calcite,the surface contact angle and adsorption amount increase,and the flotation recovery rate increases,probably because the effect of ultrasonic waves reduced the surface tension of the collector solution and increased the specific surface area.The minerals have been treated by means of ultrasonic wave,that accelerates the dissolution of WO42-on the surface of scheelite and the dissolution of Ca2+ on the surface of fluorite and calcite,exposes the surface of Ca2+ active sites on the surface of minerals.when scheelite is in anionic collector solution.,the surface contact angle and adsorption capacity increase,the flotation recovery rate increases;when fluorite and calcite are in the cationic collector solution,the surface contact angle and collector adsorption amount of increase,the flotation recovery rate increases;when scheelite,fluorite and calcite are in the chelating agent,the surface contact angle and adsorption amount both increase,the flotation recovery rate improves.When the mineral and the collector solution are mixed and treated by ultrasonic wave,the surface contact angle and adsorption amount of the mineral reduce,and the recovery rate decreases.Probably because the action of the ultrasonic wave hinders the interaction between the agent and the mineral,and lead to the partial collector which adsorbs unstable shedding from the mineral surface.