1990 Volume 76 Issue 11 Pages 1839-1846
Experiments have been carried out on smelting reduction of chromium ore to find out the conditions to get rapid reduction speed by 1 kg and 40 to 120 kg scale equipments. And by introducing a rate control model, reduction speed have been investigated.
The following results were obtained;
(1) Hard agitation, high temperature, fine ore size and low (MgO + Al2O3) content slag were efficient in getting rapid reduction speed.
(2) As an ore charging method, top blowing of ore, flux and coal mixture through oxy-coal lance were most effective.
(3) By using a mixed rate control model consisting of dissolution of ore into slag phase and reaction at the interface of carbonaceous substances and (Cr) in molten slag, contributions of several conditions to reduction speed were explained.