Development of a selective agglomeration process using light hydrocarbons for fine coal beneficiation.

摘要

elective agglomeration is a coal beneficiation process which relies on the difference between the wettability of coal and that of undesirable mineral matter including pyrite by an agglomerant. The objective of this study was to develop an advanced selective agglomeration process for fine coal cleaning using a light hydrocarbon as agglomerant which could achieve 85% ash and inorganic sulfur rejections at 85% Btu recovery. In order to achieve the objective, screening experiments were conducted and the results led to the selection of the most important operating variables affecting the process performances.;This study demonstrated that for the four coals used, a Btu recovery as high as 95;The important variables were agglomerant/coal weight ratio, grinding time (particle size), slurry pH, and agglomeration time. The effects of these variables on the process performances were statistically investigated using ultrafine Upper Freeport, Pittsburgh