Smelting reduction mechanism of chromium ore sinter by solid carbon.

Experiments were carried out at 1650°C to investigate the smelting reduction mechanism of chromium ore sinter by graphite. Chromium ore sinter was made from chromium ore and Tuxes such as lime stone, silica sand and serpentine.The following results were obtained:(1) Chromium ore particles are dispersed in molten slag until they are entirely dissolved at the terminal stage of the reduction.(2) The reduction rate is controlled by the step (ii) of the following steps:(i) the dissolution of chromium ore particles into molten slag(ii) the reduction of chromium and iron oxide in the slag at the slag- graphite interface(3) The contents of Al2O3 and MgO in molten slag increase as the reduction proceeds with the dissolution of chromium ore particles.(4) The reduction rate seems to be decreased by the increase of Al2O3 and MgO.