Study on removal characteristics of mineral matter from coal by physical separation. (3rd Report). Testing and Evaluation Method for De-ashing of Ultra-fine Coal.

Release analysis (RA) and oil agglomeration (OA) procedures were investigated to determine a standard testing method for de-ashing of fine (>10μm) and ultra-fine (<10μm) coal. The results indicated that OA was suitable for both fine and ultra-fine coal, but RA only for fine coal. Oil agglomeration tests were carried out for Datong, Wandoan and Illinois coals of different sizes. Based on the liberation model previously proposed by the authors and the removal characteristics of mineral matter by the oil agglomeration, a new simulation method was developed to predict the amount of minerals and ash content of clean coal. There was good agreement between experimental and calculated results for the clean coal of agglomerates.