Improvements in or relating to the production of coal briquettes

摘要

189,221. Broadbridge, W., Edser, E., and Beasley, W. H. Aug. 24, 1921. Flotation processes. - In the froth-flotation of Powell Duffryn duff prior to the flocculation and briquetting of the concentrate by agitation with molten binding agent, the agents added consist of 2/3 lb. of cresol and '/, of paraffin per ton of duff. Specifications 155,875 and 185,216 are referred to.