Abstract
An investigation was carried out on the response of inherently high ash Indian coals to precarbonization techniques, such as preheating, briquette blending, tar addition, stamp charging and selective crushing, both individually and in conjunction wherever possible. Extensive tests were conducted in pilot ovens followed in some cases by confirmatory tests in commercial ovens. Based on the results obtained in this study and the analysis of data available from commercial installations recommendations are made for the selection of the most suitable technique for countries faced with the problem of poor quality and/or scarce reserves of coking coal.
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