Improvements relating to the dressing of coals, shales and like carbonaceous substances

摘要

523,211. Washing coal &c. OSAWA, H. Dec. 28, 1938, No. 37671. [Class 82 (ii)] , Coal, shale, and like carbonaceous substances are dressed in a medium consisting of an aqueous suspension of a mixture of clay and finely ground cinder of roasted iron pyrites or roasted siderite ore, the suspension having a low viscosity and a specific gravity of 1À35 - 1À7.