The Effect of Gangue Composition on the Behavior of the Fe₃C Synthesis

Abstract

The purpose of this investigation is to clarify the effect of gangue composition (Al₂O₃, CaO, SiO₂ and MgO) in the hematite pellets on the synthesis of Fe₃C pellets. Pure hematite pellets and those contained one, two or three kinds of the gangue compositions were reacted in the atmosphere with H₂-30vol%CH₄gas mixture at 750°C.
It was confirmed that the Fe₃C were produced when the pellets containing Al₂O₃ (1, 3, 5 mass%), MgO (1, 3, 5 mass%) and SiO₂ (5 mass%) were reduced. All of the reduced pellets had the similar supecific surface area. However, the structure of reduced iron phase were different form each other. The reduced pellets containing Fe₃C had the iron phase with many micro pores, and the reduced pellets containing no Fe₃C had that with no micro pores.
For the pellets contained two or three kinds of the gangue compositions, it was recognized that the formation of Fe₃C is suppressed by CaO and promoted by Al₂O₃.