β Scribed by Geo.D. Dub; F.G. Moses
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Burnet. Details as to these operations, methods of concentration of the ores, the preparation of domestic graphite for crucible use, are given in Bulletin II2 of the Bureau of Mines. The method of rapid analysis of graphite used b,y the Bureau of Mines is also described. There are four methods of concentrating graphite ores, water " skirt flotation,"' the pneumatic process, the log,-washer process, and oil-froth flotation. The product of the first concentration is a comparatively lowgrade concentrate. The second step,, finishing, as it is called, is much more difficult to carry out, and is the one that demands the greatest amo,unt of investigation and improvement. Much experimental work on the preparation of Alabama graphite was carried on at the Salt Lake City station of the Bureau of Mines l~.y F. G. Moses. The whole success of a finishing process depends on the removal of a large percentage, of coarse hard impurities that tend to cause excessive destruction of valuable flake in the buhr-mill grinding. Details as to the investigations and the processes recommended are given in the bulletin of the Bureau of Mines already referred to.
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