Study On Flotation Of Henan Low Grade Bauxite Based On Collaboration Of Flotation Cell And Flotation Column

The research on the Henan DengFeng area low grade bauxite that mass ratio ofalumina and silica is in the vicinity of3is to fulfill the efficient recycling and utilization oflow grade bauxite.Fisrtly, the concentrating plant of low grade bauxite had beensystematically analysed.And the results showed those problems including low concentrategrade, low recovery rate of alumina,consumption of the collector, single separationequipment and et.al. From the seiving study of tailings, it showed that separation efficiencyof all sizes was low, especially on the coarse particle. And the flotation of proper size wasstill under low efficiency. There is a far way to promote the grade of concentration andrecovery of alumina.The ore is studied through process mineralogy in the laboratory. Multielement analysisresults show that the alumina content in the ore is53.87%, silica content is18.13%, al-siratio2.97, as a typical high aluminum high silicon and low grade bauxite. Analysis ofchemical phase of alumina shows that the ore contains diaspore, gibbsite, kaolinite and illite.The diaspore aluminum accounted for aluminum metal content45.43%. Analysis ofdisseminated particle sizes shows that the size of dispore is small.the most of sizes arebetween0.01and0.06mm, while some individual coarses can reach to0.15mm, and itscryptocrystalline crystal aggregations are in the shape of oolitic and bean granular. Kaolinite,illite and quartz are the main gangue minerals containing silicon, and these gangue mineralsin thin scaly or aphanitic microcrystalline aggregates, output, a small amount of irregulargranular, sheet output, and diaspore dissemination relationship is complex. To ensure theeffective dissociation of diaspore, grinding fineness need higher. Taking advantage of thedensity difference of ores, gravity separation is been used. Teetered bed separation can draftout some rough concentrate obtaining concentrate al-si ratio of7. As thoese two methods ofseparation are not suitable for great change of ore properties, the concentration is not stable.Therefore, the study of flotation of low grade bauxite is the inevitable choice. In termsof flotation, the collector performance contrast test is done. The correlation of the particlesize, grade of ore and the flotation rate has been done. And the results shows coarsegranular mineral flotation rate is lowand is prone to sink, while fine particles in mineralflotation rate is fast with large amount. This phenomenon can be explained by fine particlepropertises such as quality and large specific surface. Under the same particle size(except-38μm), the high grade of the mineral is prior to floate. Based on the results,the floatationsheet with the collaberation of floating cell and floating column that the floatation cell is for the separation of coarse minerals and the fine particles is separated by floatation columnwith one rouging and one concentrating is designed. Under the use of floating sheet inclosed circuit, the concentration with al-si ratio6.42is obtained, and the alumina recoverywas75.80%.On the basis of laboratory study, semi-industrial experimental study on collaberation offloatation cell and floatation column is carried out. The process parameters are expored andthe stability test of72hours is implemented. Experimental results show that with the lowgrade bauxite of al-si ratio2.86, the concentration al-si ratio can be6.36, and aluminarecovery is77.95%. Compared of the concentrating plant of low grade bauxite, thisfloatation sheet can get concentration of al-si ratio increasing by0.44, and alumina recoveryincreasing by10.81%, with the decrease of collector by200g/t.