The Dressing of Minerals

The Dressing of Minerals

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...whence it is removed by a screw conveyor. For coarse coal from 2 inches to inch, the valve makes 50 to 70 strokes and for fine coal below /ff inch, from 75 to 110 strokes per minute. Baum keeps a deep layer of coal on his sieve and maintains that with his jig a felspar bed is not required, the shale in the coal forming a sufficient bed. A convenient little jig for laboratory tests made by Braun of Freiberg and worked by puffs of air may fitly be included here. As will be seen from the illustration it consists of an outer vessel of glass about 4 inches in diameter and 7 inches high. Into it fits an indiarubber ring BB, through which passes a glass cylinder A open at both ends, to the lower end of which sieves about 2 inches in diameter, and of varying mesh as may be required, can be clamped. Through the indiarubber ring passes a brass tube C, which terminates below in an 1 Tram. Fed. In-t. Min. Eng. vn. p. 159. Fig. 230. Braun laboratory hand jig. Vertical section. annular tube with numerous small holes whilst its upper end is connected by a piece of indiarubber tube, with a hollow indiarubber pear-shaped bulb some 4 inches in diameter, by alternately pressing and releasing which, jets of air are made to issue into the upper portion of the glass vessel through the perforations in the annular portion of the brass tube; the variations in pressure thus produced, cause the water poured into the outer vessel to pulsate through the sieve. A small sample--say Ib.--of crushed mineral may conveniently be jigged in this little apparatus and the conditions for successful working thus determined. In the writer's laboratory this little instrument is always used for jigging through the sieve, a bed of leaden shot being employed. It is a useful...show more

Product details

  • Paperback | 126 pages
  • 189 x 246 x 7mm | 240g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236581229
  • 9781236581228