EXPERIMENT STUDY ON THE BEST GRANULARITY OF DIFFERENT BITUMITE FOR THE REDUCTION OF NICKEL LATERITE

The experiment was done with nickel laterite of 1.93% Ni and 14.25% Fe as sample and two different types of bitumite of A and B as the reductant.The major mineral composition of calcine and the influence of different bitumite particle size on reduction of nickel laterite were studied. The result showed that most of nickel-iron was in decentralized state and the grain size was relatively small. Besides, the distribution of iron oxide was star-shaped. For low volatile bitu-mite, the smaller the particle size is, the faster the gasification is, which is conducive to the pre-reduction of nickel ore. But for a high volatile bitumite, increasing the proportion of large-grained bituminous coal can raise the volatilization temperature of the volatile and the released volatile is fully utilized to promote the pre-reduction of nickel ore.