Study On Classification Flotation Of Sulphide Ore Based On Collaboration Of Flotation Column And Flotation Cell

The required grinding fineness for sulfide ore flotation is usually coarser, whichmeans the wider size friction in the processing. It was found that the flotation columncouldn’t process the coarser particles efficiently, and the flotation cell had lessselectivity in finer particles during the processing a pyrite containing gold ore in somedressing plant of Shandong Province, further investigations showed that the meanparticle size of the concentrate of flotation cells used as the fast and scavengingflotation were0.09mm while the mean particle size of the concentrate ofcyclonic-static micro-bubble flotation column (FCSMC) used in rough and cleanflotation in the same system were0.06mm, which also proved the granularity effectfor both flotation column and cells, the same conclusion can also be induced in theprocessing of sulfide copper ore in Dahongshan copper mine.The flotation dynamic analyses of the flotation process are carried out by thetheoretical research in flotation process of the collision, attachment and stability ofmineral particles and bubbles, and the relationship of mineral granularity and theflotation processing surroundings：The lower turbulence intensity, bigger bubble diameter, bigger aeration volume,smaller ascending distance of mineralized bubble and bigger dosage of flotationreagents were needed with the enlarging of the mineral granularity, some of whichwas also validated by laboratory experiment in Dahongshan copper mine.Then the capture probability expressions of different mineral granularity indifferent flow patterns was conducted based on the further deducing of the granularityeffect.The results of study on the different flotation equipment are shown as follows:The characteristics of flotation process of FCSMC are involving in higherturbulence intensity, taller ascending distance of mineralized bubble, smaller bubblediameter, and higher foam layer than those of flotation cells in flotation processAccording to the coupling of the requirement of the different mineralgranularity and the flotation characteristics the different flotation methods, it can beconcluded that the flotation characteristics of FCSMC are suitable to the requirementsof the fine particles while flotation cells to coarse particles. So the granularity effectevitably occurred when the wider particle size materials are only processed by onekind of flotation methods, because of the mismatching of material requirement and theequipment characteristics. The flotation process with multiple flow patterns and step enhancement based onthe multiple flow patterns of FCSMC itself and FCSMC and flotation cell is founded,which emphasize on characteristics of the granularity profile and flotability ofminerals.Further researches are developed to fulfill the flotation process with multipleflow patterns and step enhancement, then the grinding and classification systems aremodified by the usage of reclassification hydrocyclones, which solves the separationsof fineness, concentration and ore mass rate in wide granularity friction mineral byutilizing the residual pressure of the former hydrocyclone and the height of the twohydrocyclones, and it’s founded that the usage of the latter hydrocyclone have noeffect to the grinding and classification systems by calculations and stimulationsThen the obstacles in FCSMC and flotation cell classification flotation system aresmoothly removed.And the flotation flowsheet of classification of FCSMC and flotation cell insulfide copper ore is carried out in Dahongshan copper mine. Some conclusions canbe attained from the laboratory experiment in Dahongshan mine.1) The flotation performances of the classification flotation are better than that ofdirect flotation for both the FCSMC and flotation cells.2) The flotation performances of new technology of coupling FCSMC processingfine particle and flotation cell processing coarse particle are even better than that ofclassification flotation only by FCSMC or flotation cells.3) With the condition of “one stage roughing and one stage cleaning” flowsheetin fine particle and “one stage roughing, one stage scavenging, rough concentrationregrinding and two stage cleaning” flowsheet in coarse particle, the concentratecontaining21.93%Cu with the recovery of Cu95.88%was attained by the couplingnew technology, which is1.56percentages higher than that of direct flotation incopper recovery at almost the same copper grade.The comparison of products characteristics between one stage and two stagesgrinding is proposed, and it is found that the yields of the finest and coarsestgranularity in production of one stage grinding are much larger than that of twostages grinding, which is the most important reason of the worse flotationperformance in flotation of one stage grinding products.The study on classification flotation of sulfide ore based on collaboration ofFCSMC and flotation cell is carried out in industrial experiment in Dahongshan copper mine, and some conclusions are also can be drawn.1) The flotation performance of classification flotation based on collaboration ofFCSMC and flotation cell in the3rdsystem are3percentages higher in copper gradeof concentration and0.5percentages higher in recovery than that of direct flotation informer producing in the3rdsystem.2) The flotation performance of flotation cell in the3rdsystem are3.5percentages higher in copper grade of concentration and0.1percentages higher inrecovery than that of direct flotation in former producing in the3rdsystem, which isbetter than that of direct flotation.3) The flotation performance of FCSMC in the3rdsystem are1percentagehigher in copper grade of concentration and1percentages higher in recovery thanthat of direct flotation in former producing in the3rdsystem.The granularity and liberation analyses of flotation product of the FCSMC showthat the FCSMC has processed all the mineral granularity perfectly, the lower gradeof concentrates are because of the lower liberation degree, and the reasons of thelower recovery of floatation cell comes from the lower recovery in coarse particlemineral which are produced by one stage grinding in the3rdsystem and thedeficiency of the scavenging equipment configuration mode.The flotation performance of flotation cell and FCSMC in the flotationflowsheet of classification flotation based on collaboration of FCSMC and flotationcell, are both better than that of direct flotation, which is the realization of efficientseparation of wider granularity sulfide copper ore by coupling of characteristics oreand flotation equipment.