Reduction rate of cement bonded laterite briquette with CO-CO₂ gas

抄録

In order to use the laterite as a raw material in ironmaking process, reduction rate of cement bonded laterite briquettes was investigated. The reduction experiments were carried out at temperature range of 973-1273K in a thermobalance reactor using two differences CO gas concentration. Reduction of laterite using CO-CO₂ (30/70 vol.%) resulted in reducing of hematite to magnetite where nickel and cobalt completely reduced to metallic state. In the reduction using CO-CO₂ (90/10 vol.%) indicated that the nickel, cobalt and iron oxides were reduced to metallic. A kinetic analysis of the reduction was conducted on the basis of the one interface reaction model considering intraparticle diffusion and chemical reaction of Fe₂O₃ in laterite. The results indicated that the reduction mechanism of laterite was mixed control of chemical reaction and CO-CO₂ diffusion through the reacted laterite layer.