The flotation process . naphtha, gasoline, ether, alcohol, seem to serve very little purposeexcept as a means for making the pitchy ingredients of the tars moresoluble or miscible. A large, coarse, and elastic bubble seems necessary to the recoveryof coarse-grained mineral, but for the very fine or colloidal mineral,a small and comparatively brittle bubble is necessary. Power. The National Copper Co., using approximately 950cubic feet of air at 4-lb. pressure, and treating 500 tons per day on8 roughers and 2 cleaners, required 35-hp.; this equals hp. percell, or tons per horse-power,
The flotation process . naphtha, gasoline, ether, alcohol, seem to serve very little purposeexcept as a means for making the pitchy ingredients of the tars moresoluble or miscible. A large, coarse, and elastic bubble seems necessary to the recoveryof coarse-grained mineral, but for the very fine or colloidal mineral,a small and comparatively brittle bubble is necessary. Power. The National Copper Co., using approximately 950cubic feet of air at 4-lb. pressure, and treating 500 tons per day on8 roughers and 2 cleaners, required 35-hp.; this equals hp. percell, or tons per horse-power, or per ton. Another company using approximately 9600 cubic feet of airat 5-lb. pressure and treating 2400 tons per day on 48 roughersand 12 cleaners, required 210 hp.; this equals hp. per cell, tons per horse-power, or per ton. The Inspiration experimental plant, using approximately 950cu. ft. of air at 5-lb. pressure and treating 200 tons per day with 242 THE FLOTATION PROCESS. fc NOTES ON FLOTATION 243 4 roughers and 1 half-size cleaner required 25 hp.; deducting 4 two 2-in. centrifugal pumps, this equals 20 hp., or 4 hp. per cell,or 10 tons per horse-power, or per ton. -s^to 4, NCtr ecu.
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