IMPROVING CHARACTERIZATION OF LOW GRADE DIASPORIC BAUXITE TO BE UTILIZE IN JAJARM ALUMINA PLANT

摘要

To increase the proportion of lower grade bauxite in the utilizedfeed and also possibility of increasing A/S ratio in the plant feed(4.66), some investigations on improving A/S ratio of ElburzBauxite, especially lower grade ones, by gravitational method andflotation has been carried out. To evaluate heavy mediaseparation, using heavy liquids with different specific gravitiesbetween 2.8-3.4 (g/cm3) on various size fractions of this bauxitewith initial A/S ratio between 1.3-8.5, resulted that a specialspecific gravity can produce the concentrates (in sunk fractions)with the A/S ratios and productivities which can economically beused as plant feed . Pilot plant tests also carried out on a 25tsample of Bauxite with a A/S ratio of 2.0 and concentrate A/S andrecovery in DMS tests were 3.30 and >40%, respectively.