Pelletization Studies of Pre Concentrated Magnetite

Abstract

Pelletization studies were conducted on dry ground beneficiated magnetite concentrates from Belagal Range, Sandur Schist belt varying disc inclination, disc rpm, moisture%, and MOG and Bentonite % initially. The optimum conditions were 45o inclination, 22.5 rpm, 9.4% moisture, 89% -0.045 mm / 1576 cm2/gm., 0.9% Bentonite. Increase in Magnesite-CaO dosage to 1.45% increased the yield, drop number and CCS under above optimum conditions to 72.5%, 8.2,1040 gms. respectively The above green pellets were dried, pre heated, fired and cooled in Pot grate furnace 4-6’ Ramp and 2’ hold time at 350oC, 500oC, 700oC, 1000oC, 1175oC, 1310oC each respectively for drying, preheating and firing zones.BF grade pellets assaying 63.7% Fe,7.42% silica, 0.21% alumina, 0.36% CaO, 0.71% MgO, 0.01% each P and Sat, 0.13 basicity, 71% green pellet yield, 4 drop No., 640gms CCS, 2.09 g/cc bulk density, 95.4% Tumbler index, 4.5% Abrasion index, 223 kg crushing strength,31% porosity, 6% reduction degradation index, 14.5% thermal degradation index, 65% relative reducibility were produced under optimum conditions. The beneficiated magnetite concentrate was found amenable to pelletization.