Abstract

The effect of sinter size after reduction degradation on the reducibility was estimated with the newly designed experimental method simulating the actual blast furnace condition with various temperatures, reduction times and initial sinter sizes. The degree of reduction of sinter particles is dependent on low temperature degradation and increases in surface area as a result of the degradation. The RI of CaCl₂-added-sinter was also estimated to verify the effect of additives for retarding reduction degradation on the reducibility. The RI decreases with CaCl₂ as much as decreasing reduction degradation. Thus, in order to understand the reducibility of sinter, not only should the basic composition including fluxed oxides be considered, but also the sinter size after reduction degradation.

Graphic Abstract

摘要

通过新设计的实验方法估算还原降解后烧结矿尺寸对还原性的影响，该方法模拟了不同温度，还原时间和初始烧结矿尺寸的高炉实际条件。烧结颗粒的还原程度取决于低温降解，并且由于降解而导致表面积增加。还估计了添加CaCl ₂的烧结体的RI，以验证添加剂用于延迟还原降解对还原性的影响。RI随CaCl ₂降低减少还原退化。因此，为了理解烧结矿的还原性，不仅要考虑包括助熔氧化物的基本组成，而且要考虑还原降解后的烧结矿尺寸。

图形摘要