On Degradation of Sinter during Chemical Reduction.

Abstract

In recent years, techniques of blast furnace operation have considerably advanced, such as fuel injection, high top pressure, oxygen enrichment, etc.These new techniques have cut down coke consumption and increased productivity.In this connection qualities of sinter acquire greater importance to blast furnace operation.We studied on degradation of sinter during chemical reduction at low temperature below 650°C, and effects of degradation of sinter on blast furnace condition
The results obtained are as follows:
(i) Operational data of the commercial blast furnace at degradation of sinter leads to lower productivity of blast furnace.
(ii) Sinter was remarkably degraded at about 500°C, and also with an increase of heating rate.
(iii) There was no relationship between shatter index and degradation of sinter.
(iv) Degradation of sinter during chemical reduction can be avoided by increase of FeO or slag components of sinter.
(v) It was presumed that degradation of sinter was related with chemical reduction and carbon deposition reactions.