Research On Behaviors And Mechanism Of Dispersion Of The Fine Collophane And Dolomite

In recent years,studies have shown that selective flocculation flotation is an effective means to improve and strengthen the flotation of fine mineral.In the fine-grained phosphate rock sorting,micro-granulated phosphate and dolomite pulp cannot be stably dispersed.Therefore,it is of great practical significance to study the dispersion behavior of micro-particulate phosphate and dolomite,making the fine particles are good and stable in the slurry system.Through the single mineral sedimentation experiment,stirring speed,stirring time,solution pH and dispersant type?ZSC,ZSS,ZSP-1,ZSP-2,ZSP-3?and dosages on the influence of the dispersion behavior of the micro-granular collophane and dolomite have been examined.In different dispersant system,the influence of decentralized behavior of adding Ca²⁺,Mg²⁺ on the micro-granular collophane and dolomite has been studied.The mechanism of the interaction of the micro-granular collophane and the dolomite surface and the dispersant was revealed by Zeta potential,contact angle,surface tension and infrared spectroscopy.The influence of the dispersant on the floatability of the microfine single mineral was also investigated.The results of the study have improved the theory of micro-granular phosphate and dolomite dispersion,and provided the theoretical basis for efficient flotation of magnesium phosphate.Increasing the stirring speed and time can promote the dispersion of micro-granular collophane.When the stirring speed exceeds 2000 r/min and the stirring time is more than 10 min,the dispersion behavior tends to be stable.Without dispersant,pH has a great influence on decentralized system,micro-granular collophane and dolomite can be dispersed up to 20% in alkaline pulp,which is superior to the acidic conditions?dispersion rate is 5%?.When the concentration of phosphate was 2 mg/L,pH had a great effect on the dispersion of micro-particle.The effect of the dispersant on the dispersion effect of the two minerals was ZSP-1>ZSP-2>ZSP-3>ZSS>ZSC,and the dispersion effect of the fine granite phosphate was better than that of the dolomite;the dispersant has a greater effect on the dispersion of micro-particulate phosphate and dolomite.Ca²⁺ and Mg²⁺ weaken the dispersion behavior of micro-particulate phosphate and dolomite in different dispersant systems.With the increase of Ca²⁺ and Mg²⁺ concentration,the dispersibility of both minerals decreases.Dispersant,solution pH and Ca²⁺,Mg²⁺ hardly affect the surface tension of the solution.With the increase of dispersant concentration,the Zeta potential absolute value increased,contact Angle reduced,surface hydrophilicity enhanced,dispersion rate increased;Ca²⁺?Mg²⁺ can reduce Zeta potential absolute value of mineral particle surface,increase mineral particle contact Angle,which causes the decrease of hydrophilic?dispersibility and the electrostatic repulsion between mineral grains.FTIR shows that the adsorption of dispersant and Ca²⁺,Mg²⁺ on the surface of collophane and dolomite are in the form of physical adsorption and chemical adsorption.Zeta potential and surface wettability is the key factor that affects the dispersion behavior of the micro-granular collophane and dolomite.Under the two kinds of collector system of sodium oleate and GJBW,the floating rate of the two kinds of fine particles decreases with the concentration of dispersant,but the selective separation effect of microfine phosphate and dolomite increased,The effect of flotation separation was more significant than that of ZSP-1 dispersant.