. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 1 J2 4 12 12 148 MACHINERY FOR METALLIFEROUS MINES. Centrifugal Pumps.—The concentration of metalliferous ores isbest effected where a continuous supply of fresh, clean water is often happens, however, that the mill is so situated that the wateris scarce and dear. In these cases the same water must be usedover and over again after first passing through settling pits, in whichtlie heaviest slimes are deposited. The water is, however, by no meansclean, and those who
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 1 J2 4 12 12 148 MACHINERY FOR METALLIFEROUS MINES. Centrifugal Pumps.—The concentration of metalliferous ores isbest effected where a continuous supply of fresh, clean water is often happens, however, that the mill is so situated that the wateris scarce and dear. In these cases the same water must be usedover and over again after first passing through settling pits, in whichtlie heaviest slimes are deposited. The water is, however, by no meansclean, and those who have attempted the pumping of water chargedwith fine mineral matter, by means of ordinary pumps, can best appreciatethe difficulties connected therewith. A pump, therefore, which has practically no valves is especially valuablefor milling purposes, and the centrifugal pump has been largely adoptedwhere muddy waters have to be dealt with, as in the mills illustratedin figs. 302 to 307. This form of pump is not suitable, however, where thetotal lift is greater than from 50 ft. to 60 ft., and in no case should it. Figs. 107, 108.—The Centrifugal Pump. be placed at a greater height than 20 ft. above the surface of the waterto be raised. The ordinary form of the pump is shown in figs. 107 and 108, and,as will be seen, it can easily be erected upon a couple of baulksof timber for temporary, or on a masonry foundation for permanentwork. Great care must be taken that the joints of the suction pipes areperfectly air- and water-tight, and that the gland (e) round the pumpspindle and the cover (d) does not leak. The soundness of these joints is best tested by allowing the pumpto stand a short time with the pipes full of water, when, if any leakageexists, it will probably show itself. When the water to be raised is below the centre of the pump spindle,the pump must be charged before it can deliver any water. This is done by filling the suction pipe and pump case full of waterwhile the
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