Portal de Periódicos da CAPES

Effect of magnesite on the properties of pellets at room and low (900.DEG.C) temperatures.

1983; Volume: 23; Issue: 2 Linguagem: Inglês

10.2355/isijinternational1966.23.146

1881-1183

Takeshi Sugiyama, Shoji SHIRUCHI, Osamu TSUCHIYA, Mamoru Onoda, Isao Fujita,

Minerals Flotation and Separation Techniques

Properties of acid pellets with MgO/SiO2 ratios between 0 and 1.3 and pellets with MgO and CaO/SiO2 ratios between 0 and 1.3 are presented.The amount of magnesio-ferrite in the fired pellets with MgO can be evaluated by the value of the magnetic susceptibility of the pellets, since it increases with the MgO contents. This amount varies with the CaO/SiO2 ratio when CaO is present in the pellets. The MgO density shows stripe-like distribution when Mg++ diffuses into hematite at temperatures below 1 395°C, and changes hyperbolicly when the temperature is above 1 395°C. The MgO density changes hyperbolicly at various temperatures when Mg++ douses into magnetite in the N2 gas flow.The reducibility of magnesio-ferrite is slightly inferior to that of hematite. Therefore, the reducibility of the pellets decreases with the amount of magnesio-ferrite in the pellets. The changes in the volume of magnesio-ferrite during reduction are very slight. Swelling decreases with increasing amounts of it in the pellets.