高铁低镍型红土镍矿选择性还原中还原剂对硫酸钠作用机理的影响

high iron and low nickel laterite is used as the sample ore to investigate the effect of reductant types on the selective reduction process and action mechanism of the added Na2SO4. The results showed that, without the addition of Na2SO4, the reductant types had a great influence on the reduction process of the sample ore. The order of the reduction selectivity was lignite＞bituminous＞coke, which was the same as the order of their reactivity. In the selective reduction process, the action mechanism of Na2SO4 was also remarkably affected by the reductant types when Na2SO4 was added. At its dosage of 5%, the mineral compositions of the roasted ores, using different types of reductant, were identical in category but different in content. Nevertheless, there were qualitative differences among the mineral compositions of the roasted ores when increasing Na2SO4 dosage to 20%. Magnetite was produced with lignite and bituminous used as reductant respectively. While no magnetite generated when it came to coke and the effect of selective reduction was best in this case.