Reduction Behavior of Chromium Ore in a Fluidized Bed

Gaseous reduction tests of the fine chromium ore with hydro-carbon were carried out in the temperature range from 900 to 1 150°C by use of a laboratory scale fluidized bed. The obtained results are as follows : 1) Reduction degree of 60% is easily obtained by use of methane and propane gases in the temperature range from 1 000 to 1 100°C. 2) The addition of calcium hydroxide enhances the gaseous reduction of the chromium ore. 3) The reduction degree increases with the increase of methane or propane content in the gas. The optimum gas content exists because the reduction rate of chromium ore is deteriorated by carbon deposited from excessive reducing gas.