TG/DTA study on the carbon monoxide and graphite thermal reduction of a high-grade iron nickel oxide residue with the presence of siliceous gangue

The reduction behavior of a leach residue containing hematite (Fe2O3), nickel ferrite (NiFe2O4) and a small amount of siliceous gangue was studied using thermogravimetric (TG) and differential thermal analysis (DTA) techniques. Carbon monoxide and graphite were used as reductants and a wide range of temperatures were covered. Both non-isothermal reduction (15°C/min) and isothermal reduction tests with continuous measurement of the CO and CO2 …