| Abstract: | Processes during the firing of pellets consisting of siderite concentrate and Ca(OH)2 have been studied by means of X-ray diffractometer and microanalyzer. When temperature is higher than 400°C thermal siderite decomposition starts, producing haematite and calcite being observed up to 600°C with the technique of oscillating X-ray detector. With increasing temperature CaO which arises from calcite doesn't react with SiO2 up to 750°C; Fe2O3 grains grow. Above 1000°C CaO is dissolved in Fe oxides, and ferrite of CF type is formed. At temperatures higher than 1130°C a new phase is forming, presumedly a ferrite CF2. Results of the study of this phase being stable up to 1250°C are reported. |
