. Graphite. j ON\7 J. Fig. 16. Section through type of air classifiers used in Alabama mills. Dimensions approximate only. quickly and cheaply installed. The device is nothing more than a largebox or chamber, open at the front, and having an ordinary electric exhaustfan set into the back. In the front opening is arranged a series of angle-iron baffles, above which is set the feed hopper. This is fitted with a feedroller, over which the material falls to the baffles. The suction caused bythe fan at the back draws the lighter graphite into the chamber, while theheavier gangue particles fall down
. Graphite. j ON\7 J. Fig. 16. Section through type of air classifiers used in Alabama mills. Dimensions approximate only. quickly and cheaply installed. The device is nothing more than a largebox or chamber, open at the front, and having an ordinary electric exhaustfan set into the back. In the front opening is arranged a series of angle-iron baffles, above which is set the feed hopper. This is fitted with a feedroller, over which the material falls to the baffles. The suction caused bythe fan at the back draws the lighter graphite into the chamber, while theheavier gangue particles fall down through and in front of the lightest particles are drawn to the back of the chamber, while thecoarser flake falls immediately behind the baffles. The chamber is usually 67945—6-1 74 provided with three collecting hoppers, for dust, middlings, and coarsegraphite. The device is used at different stages in the various mills, some employ-ing it to effect an initial concentration of the crushed ore from the
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Keywords: ., bookauthorcanadami, bookcentury1900, bookdecade1920, bookyear1920
