Washing and coking tests of coal at the fuel-testing plant, Denver, Colo. July 1, 1907, to June 30, 1908 / by A.W. Belden, G.R. Delamater and J.W. Groves.
Publication Info.
Washington, D.C. : Department of the Interior, United States Geological Survey, 1909.
The washing tests of coal were made to determine the possibility of so improving the quality of the coal as to render it available for the production of coke for the coal used in coking must be as free as possible from ash, sulphur, and other impurities, because of its prospective use in metallurgical processes. The investigations described in this report were undertaken by the Government for the general purpose of increasing efficiency in the utilization of the fuel supply of the United States.