Potential Use of High Ash Indian Medium Coking Coal in Stamp Charged Coke Making

ABSTRACTTo produce low-cost hot metal, Tata Steel always had to deal with trilemma, that is, cost-quality-mining life to achieve maximum benefit in the steel business. Tata Steel used approximately 50–60% Indian medium captive coking coal having 15–16% clean coal ash in the stamp charged coal blend. Keeping in view, consumption, and preservation of the Indian medium coking coal by modulating clean coal ash without deteriorating the coke quality was the subject of the study. The study revealed that 55% captive Indian medium coking coal up to 19.10% clean coal ash in coal blend could be used to produce coke CSR ≥65. It also reduces the coal blend cost with added benefits of the increase in the captive mine life. This paper described in detail, the effect of variation of ash percentage of captive medium coking coal in the blend on the lateral expansion and hot strength of coke especially of coke CSR.