Study On Flotation Behavior And Depressant Of Calcium Bearing Minerals With Different Particle Size

With the mining of ores,the tendency of minerals to become "lean,fine,and mixed" becomes more and more serious,and the recovery of low-grade,fine-grained minerals has received increasing attention.Inhibitors can change the surface properties of minerals to improve the floatability of minerals.In this paper,three common calcium-bearing minerals,scheelite,fluorite and calcite,were selected for flotation experiments of single minerals with different particle sizes(-0.18+0.1mm,-0.1+0.074 mm,-0.074+ 0.023 mm,-0.023mm)and artificial mixed ore.The experiment mainly studied the effect of pH,collector NaOL,modified water glass inhibitors SK-2and KS on the flotation performance of different particle size calcite,fluorite and scheelite.Inhibitors SK-2 and KS affect the flotation separation of 2: 1 artificial mixed ore of calcite and fluorite,2: 1 artificial mixed ore of calcite and scheelite.The mechanism of inhibitors SK-2 and KS on the surface of scheelite,fluorite and calcite minerals was studied by IR,determination of zeta potential and determination of contact angle of powder.The single-mineral flotation test shows that in the alkaline pH range,scheelite,fluorite and calcite of different sizes can exhibit better floatability;fine-grained minerals need more collector achieve a good recovery rate;fine-grained minerals need more collector achieve a good recovery rate;inhibitors SK-2 and KS can play a good inhibitory effect on-0.18+0.1mm,-0.1+0.074 mm,-0.074+0.023 mm calcite,and the inhibitory effect on-0.023 mm calcite is weakened.The separation test of artificial mixed ore shows that inhibitors SK-2 and KS can separate the 2: 1 artificial mixed ore of calcite(-0.18+0.1mm,-0.1+0.074mm)and fluorite(-0.074+0.023 mm,-0.023mm),2: 1 artificial mixed ore of calcite(-0.18+0.1mm,-0.1+0.074mm)and scheelite(-0.074+0.023 mm,-0.023mm)well;separated the 2: 1 artificial mixed ore of calcite(-0.074+0.023mm)and fluorite(-0.074+0.023 mm,-0.023mm),2: 1 artificial mixed ore of calcite(-0.074+0.023mm)and scheelite(-0.074+0.023 mm,-0.023mm)were hard;separated the 2: 1 artificial mixed ore of calcite(-0.023mm)and fluorite(-0.074+0.023 mm,-0.023mm),2: 1artificial mixed ore of calcite(-0.023mm)and scheelite(-0.074+0.023 mm,-0.023mm)by reverse flotation.By IR,it was found that the modified water glass inhibitors SK-2 and KS havechemical adsorption on the surface of calcite;Through the zeta potential test,it was found that the adsorption strength of inhibitors SK-2 and KS on scheelite,fluorite and calcite is:After the addition of inhibitors SK-2 and KS,the powder contact angles of different grades of scheelite,fluorite and calcite have different decreases,indicating that inhibitors SK-2 and KS have different effects on the different grades of scheelite,fluorite and calcite.