Hydrocyclone Separation of Ca-Bentonites
In this study,Ca-bentonite was subjected to a series of systematic hydrocycione tests with the aim of developing separation procedures and in turn achieving optimum recoveries.In hydrocyclone tests,vortex and apex diameters and also feed pressures were investigated.In each hydrocyclone set,vortex diameter was kept constant while the other two parameters varied to produce bentonites concentrates of various smectite contents.The separation efficiencies were evaluated based on the cation exchange capacity (CEC),particle size and swelling index.The detailed hydrocyclone tests showed that,upgrading of Ca-bentonites require procedures different from the bentonites reported in the literature.Sodium and mixed bentonites are easyto-disperse and easy-to-separate whereas calcium types need to be scrubbed rigorously for disintegration.Scrubbing properties of ca-bentonite were investigated as a function of scrubbing time and percent solids by weight (PS).The scrubbing conditions at 700 rpm for 1.5 hours and percent solids of 30 % were found more effective for achieving a better quality bentonite.In addition to the parameters mentioned above,the effect of percent solids on hydrocyclone separation was also studied.Although Ca-bentonites permit studying at higher percent solids,increasing solids content of the pulp deteriorated the quality of the clean products.Application of an appropriate separation scheme enabled the development of a unique separation procedure involving stage wise scrubbing followed by hydrocycloning which yielded calcium bentonite concentrates with CEC of 90 meq/100 g and high swelling indexes of 12 mL from the original bentonite of 65 meq/100 g and 7.0 mL,respectively. These results indicate that upgraded bentonite products can be conveniently used in various diverse industrial applications including bleaching earth,desiccant,cat litter,paper etc.
Hydrocyclone Ca-bentonites Cation enchange capacity (CEC) Swelling inden
F.Boylu G.Bulut S.Hacio(g)lu E.Y(u)ce K.(C)inku M.S.(C)elik
Faculty of Mines,Mineral Processing Engineering Department,Istanbul Technical University,Istanbul,Turkey
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
4309-4317
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）