Research On The Reciprocal Influences Between Calcium-Containing Ores And Quartz In Flotation

Due to the decrease of domestic tungsten resource reserves year by year,the accumulation of tungsten tailings reserves is huge,so the comprehensive utilization of tungsten tailings is imperative.From tungsten tailings recovery of valuable metals and non-metallic mineral,but calcium flotability of useful minerals and associated minerals,mineral surface physical and chemical properties similar to exist in the process of flotation separation of minerals,attract and cover has caused the dissolution of gangue mineral activation or the interaction of useful minerals are suppressed,bring difficulty to the useful minerals flotation separation of calcium.Therefore,this paper studies the interaction of calcium-bearing minerals and associated mineral quartz in flotation,which has very important theoretical guidance and practical significance for improving flotation effect and optimizing reagent system.The interaction effect of minerals in flotation system refers to the effect that the dissolution,attraction and capping of minerals in flotation system can activate gangue minerals or inhibit useful minerals so as to lead to flotation separation.This article selects fluorite and quartz,calcite,garnet four tungsten tailings recovery value of mineral as the research object,in a single mineral test for four kinds of mineral flotability under sodium oleate and CTAB system and adjust the dose of sodium hexametaphosphate and tannin to study the influence of mineral flotability of sodium oleate system under four kinds of mineral flotability size order for Fluorite>Calcite>Garnet>Quartz,the order of floatability of the four minerals in CTAB system is Quartz>Garnet>Fluorite>Calcite,low dosage of sodium hexametaphosphate and tannin can activate calcite and increase recovery,and the rest can inhibit the four minerals to varying degrees.Flotation tests were carried out on the interaction of minerals with different contents and grain size.It was found that the associated minerals with different grain size had different effects on fluorite or quartz with different grain size.The effect of fine grained associated minerals on the recovery of fluorite or quartz is greater than that of coarse grained associated minerals.The coarse-grained associated minerals have the least influence on the grade of fine-grained fluorite or quartz.The addition of associated minerals can sometimes activate fluorite or quartz to increase recovery,but the grade of fluorite or quartz is reduced to varying degrees.The influence on recovery and grade depends on the floatability,particle size and E-DLVO action energy of minerals in different reagent systems,which is relatively complicated.Zeta-potential,contact Angle test,scanning electron microscopy and other means were used to analyze the mechanism of the interaction between minerals in combination with e-DLVO theoretical calculation.Finally,combined with the flotation test results of single minerals and mixed minerals,the analysis was carried out to find a method to eliminate the interaction between minerals in the flotation separation process.The hydrophilicity of natural mineral surface is Quartz > Garnet > Calcite > Fluorite,in the sodium oleate system,only the interaction between fluorite and calcite is attractive,and the interaction between fluorite and garnet and fluorite and quartz is repulsive.The order of E-DLVO interaction energy is Fluorite+Garnet > Fluorite+Quartz.In the CTAB system,the order of E-DLVO action energy is Fluorite+Garnet > Fluorite+Quartz > Fluorite+Calcite > Quartz+Garnet > Quartz+Calcite.The larger the particle size between mineral particles is,the closer the distance is,and the greater the interaction energy is.When the interaction energy between mineral particles is attractive,the minerals are prone to adsorption or capping.The interaction effect of attraction or capping is one of the main reasons leading to the difficult flotation separation between minerals.Under sodium oleate and CTAB system,the effect of calcium lignosulfonate at low concentration can be attenuated first,because the dispersion effect of calcium lignosulfonate reduces the adverse effect of adsorption cap,so as to achieve separation between minerals.