Comparison of Methods for Determining the Reactivity CRI of Blast Furnace Coke

The reactivity of coke (CRI) and the coke strength after reaction with CO₂ (CSR) are important characteristics of blast furnace coke. The reactivity CRI of coke reflects its ability to react with reducing gases, while the hot strength CSR indicates its ability to maintain its structure and its resistance to failure under the batch column in the blast furnace at high temperature and pressure. Methods of determining CRI and CSR were developed in Japan half a century ago. Experience shows that, for coking in the same coke oven, the spread of CRI and CSR may be 6% or more, whereas State Standard GOST 54250–2010 requires values no higher than 3–4%. Additional research is required to establish the causes of this discrepancy and to identify means for its elimination. In the present work, we report Indian research using an updated method of determining CRI and CSR. New experiments are conducted to test the findings of the Indian research.