Study On The Production Of High Quality Coke From Blending Low-qualitiy Coals

Coking with low-quality coals as raw material would enrich the feedstockresources for the coking industry and reduce the cost, which have important strategicand economic values. Several kinds of coals in different ranks and coal tar pitch werecarbonized in a40kg coke oven. Based on the analyses of coal quality, petrographiccompositions and coke properties, the relations between optical microscopic textureof coke and coal rank, and the effect of pitch on the coking properties duringco-carbonization were investigated repectively. The coking mechanism andoptimization of blending ratio among high ash coals were studied. The results showthat co-carbonization of pitch and high-rank coals would improve the mechanical andthermal properties of coke significantly. The inherent minerals in fat coal&cokingcoal rich in carbominerite were distributing evenly and in intimate contactwithvitrinite. Therefore, high-quality cokes could be obtained even less metaplast waspresent during the coking process. It could be basically concluded that high-ashcoking coal and fat coal rich in carbominerite can be blended with low cohesivemeager lean coal for high-quality coke production, which has been demonstrated byindustrial experiments.