PRESS DEWATERING OF BROWN COAL: PART 1-EXPLORATORY STUDIES

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Abstract
The large water content of brown coal can be reduced by press dewatering with much lower energy requirement than by alternative methods. The cost of the press need.ed increases with the required pressing pressure, which is det e rmfned by the coal properties. The results of experiments on Victorian brown coals are interpreted with supporting theory to give these properties, and the effects on these of grinding and slurrying and of thermal, mechanical and chemical pretreatments. Brown coals from Victoria are compared with lignites from South Australia and West Germany after slurrying, and with a thickened wash-water effluent containing Victorian brown coal dust. Salt removal from the high-salt South Australian coal was obtained.