India has vast coal resources all over the country; however, the presence of high ash content makes them invulnerable for industrial usage. To compensate for the rapid depletion of high-quality coking coals and to compensate for the demand for coal in iron and steel sectors, coal cleaning or beneficiation and blending techniques have come into limelight for the usage of low-quality coal. In this paper, laboratory-scale experiments were performed on the utilization of Indian high ash non-coking coal (NCC) and imported semi-coking coal (SCC) for the coke preparation. At first, washability characteristics of Indian high ash coal were investigated by using jigging, spiral concentration, and sink and float density separation methods. The optimum cut-off density NCC and SCC coals were blended and sent for the caking properties analysis. Proximate and ultimate analysis, vitrinite reflectance, crucible swelling number, and caking index or roga index have been taken as the measure for the caking ability of coal blends.

印度全国各地都有丰富的煤炭资源。然而，高灰分的存在使它们无害于工业用途。为了补偿高品质炼焦煤的迅速枯竭并补偿钢铁行业对煤炭的需求，煤炭清洁或选矿和混合技术已成为使用低质煤的焦点。本文对印度高灰非焦煤（NCC）和进口半焦煤（SCC）用于焦炭制备进行了实验室规模的实验。首先，通过跳汰，螺旋浓缩，沉浮浮选法研究了印度高灰煤的可洗性。将最佳临界密度NCC和SCC煤混合并送去进行结块性能分析。