Dielectric Properties of Silicothermic Reduction Chromite in the Microwave Field

Abstract

The microwave absorption properties of chromite and the feasibility of microwave reduction chromite have been discussed. The results show that as the density increases, the dielectric properties of materials increase. The dielectric properties are the best (the value around 4.2) when the silica ratio is 0.5. Microwave penetration depth shows that chromite and the mixture have good wave absorption properties.

The Direct Alloying of Steel through Silicothermic Self-Reduction of Chromite Ore Utilizing Si-Containing Solid Waste

“…Theoretically, when Si is employed as a reducing agent, the reduction of Fe 2 O 3 to FeO occurs between 600 and 750 • C, with the temperature range of 750 to 900 • C for the conversion of FeO to metallic Fe. However, the reduction rate is relatively low at lower temperatures, and the complete transformation of Fe 2 O 3 to Fe necessitates temperatures ranging from 1100 to 1300 • C, approximately reaching 1300 • C for the conversion of Cr 2 O 3 to metallic Cr [36,37]. As shown in Figure 11a, the self-reduction compacts are first added to the surface of the molten steel, and as the temperature reaches the reduction temperature of iron oxides, a direct reduction reaction is initiated at the interface between chromite ore and Si, and Fe 2 O 3 is reduced to FeO (Figure 11b).…”