File:Graphite (1920) (14784328352).jpg

Identifier: graphite00cana (find matches)
Title: Graphite
Year: 1920 (1920s)
Authors: Canada. Mines Branch (1901-1936) Spence, Hugh S. (Hugh Swaine), 1885-
Subjects: Graphite
Publisher: Ottawa : Thomas Mulvey
Contributing Library: University of Connecticut Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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mill in Alabama, while Fig. 29 showsthe installation at a mill in New York. In the case of Fig. 28, the ore issoft, and carries about 3 per cent of graphite, while that treated by flowsheet Fig. 29 is hard and runs about 6 per cent. The latter type of installa-tion, with minor modifications, is suggested as the more suitable for treatingCanadian gneissic ores. In the case of the softer, graphitic limestones,the second ball mill might possibly be dispensed with. The originalCallow installation at the New York mill contained only the Hardingemill A, and with this equipment a one-product concentrate was securedrunning 70-75 per cent carbon, with a 95 per cent extraction. With theadditional mill B, it is hoped to raise the grade of product to 90 per centor better. The concentrates from this mill undergo a further refining bymeans of burrstones and screens. On the following pages are shown the results of tests made on a seriesof samples of Canadian graphite ores with the Callow system. 91
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