. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. t excessive. The interioris lined with hard steel plates which are renewed] when worn from spare I50 MACHINERY FOR METALLIFEROUS MINES. parts kept in stock. The axle and the flier also wear and have tobe renewed from time to time. Pumping the Tailings from Batteries.—Very great difficultyhas been experienced in pumping tailings, owing to the water necessarilybeing very gritty. The result has been the rapid destruction of boththe buckets and valves of pumps usually employed. The
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. t excessive. The interioris lined with hard steel plates which are renewed] when worn from spare I50 MACHINERY FOR METALLIFEROUS MINES. parts kept in stock. The axle and the flier also wear and have tobe renewed from time to time. Pumping the Tailings from Batteries.—Very great difficultyhas been experienced in pumping tailings, owing to the water necessarilybeing very gritty. The result has been the rapid destruction of boththe buckets and valves of pumps usually employed. These difficulties have been obviated by an arrangement of pumpintroduced by Hayward, Tyler & Co. The external appearance of thepump, as shown in fig. 109, does not differ materially from an ordinarydouble acting pump, but in place of the back cover is a longbonnet. In the interior of the pump, instead of a piston or bucket,there is a plunger working through a gland in the middle of thepump. This gland is easily accessible by removing the bonnet, andis packed with hemp and tallow. The plunger is found to work. Fig. 109.—Tailings Pump. very much longer than any form of piston, and it is much easier torepack the gland than to replace bucket leathers or rings. The valvesof the pump are simply balls of solid mineralised rubber, which wearaway without losing their efficiency for a very long period, and whenworn too small can be replaced with the fingers, after removal of thecover. The seats are gun-metal cages, which appear to be practicallyindestructible, as the valve which works on them is of so much softermaterial. These pumps are made either singly or in pairs up to largesizes, and are being used in large numbers in the South African gold-fields. Tailings Wheels Another device for lifting the mixture of sand and water known as tailings or slimes is by means of a tailings wheelsuch as that shown in fig. no. This resembles a waterwheel exceptthat the openings to the buckets are o
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