Image from page 341 of "Bulletin" (1905)

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    Identifier: bulletin78cali
    Title: Bulletin
    Year: 1905 (1900s)
    Authors: California. Division of Mines and Geology California. State Mining Bureau. Bulletin
    Subjects: Mines and mineral resources Geology
    Publisher: San Francisco [etc.]
    Contributing Library: Gerstein - University of Toronto
    Digitizing Sponsor: University of Toronto

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    Text Appearing Before Image:
    ning in the bottom of the agitation compart-ment. Both tailings and concentrates samples were dried andweighed. At the end of all tests, both with the Hyde and the Case apparatus,the inside of the machine was thoroughly washed out to avoid contam-ination of the oils used. The Case (Hoover type) Flotation :\rachine (see Photo No. 72) isa laboratory unit built by the Denver Fire Clay Company, Denver, 302 CAI.1FOKX1A STATE iAJIXINC BIREAT. Colo. It consists of a sinjile aluminum casting comprising the agita-tion cell and a spitzkasten for the collection of the froth. Within theagitation cell are hung the shaft and impeller, the four blades of whichare set at 90°. The steel shaft is coated with lead and the impellerl)lades are made of an alloy to resist the corrosive action of acids. Apiece of heavy rul)bei tubing connects the spitzkasten and agitationcell at the ])f)ttom. About half way down from the top of the spitz-kasten. an o|)(ning (^ inch liigh x 1 inch wide) in the wall also con-

    Text Appearing After Image:
    Photo No. 73. Froth on a Flotation Test with the Case Machine. nects witli the agitation compartment. Tliis opening is controlled bya vertical, slotted plate, with a baffle at its lower end. When themachine is in operation the pui]) and froth work from the agitationcompartment, through this opening to the s|)itzkasten from whicli thegangue on settling to the bottom is drawn through the rubber tube bythe suction of the impellei- blades back into the agitation compartment.This gives a continuous circulation of the pulj) tlirougli the two cellsas long as the test lasts. The ini|)ellti- shaft is driven by a G. E. QlJCKSll.VKK KESOCKCKS. 303 iiuliiftiuii iiiot(»r, tyi)e DSS, W33, 220 volts, i li. p. (iO cycles, uperatingtit 1800 i. p. 111. The larger- two of the pulleys give the impellerspeeds of 1800 and 1300 r. p. in., respectively. A lip on the edge ofthe spitzkasten provides for the overflow of the fi-oth (see Photo Xo.73). which may also be skimmed off from time to time with the smal

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