. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e inWales, with very satisfactory results. Gruson Patent Ball Mill.— Numerous attempts have been made toconstruct pulverising mills upon the ballprinciple, and the failures have been almostas numerous. The Gruson mill, manufactured by the Gruson Company, of Magde-burg-Buckau, is shown in figs. 169 and 170. It consists of a steel drumslowly revolving on a steel shaft. Inside are a certain number ofhard steel balls of different diameters, which, on the revolution of thedrum, cont
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e inWales, with very satisfactory results. Gruson Patent Ball Mill.— Numerous attempts have been made toconstruct pulverising mills upon the ballprinciple, and the failures have been almostas numerous. The Gruson mill, manufactured by the Gruson Company, of Magde-burg-Buckau, is shown in figs. 169 and 170. It consists of a steel drumslowly revolving on a steel shaft. Inside are a certain number ofhard steel balls of different diameters, which, on the revolution of thedrum, continually fall upon and grind the ore, which is fed into the millfrom the hopper (h). It will be seen that the hard steel lining plates {a a) are so arrangedthat the balls fall from one to the other, each being perforated with anumber of holes through which the crushed ore falls first on to aperforated plate (c) which acts as a protector to the fine circumferentialsieve {d). The ore which is insufiiciently crushed is returned into the millby the guide plates {g), and no ore can leave the mill unless crushed down. Fi), and the ore is fed in from the hopper by means of a screwpropeller fixed on to the shaft. The mill will work either dry or wet, and the pulp falls into the hopper(e) which forms part of the exterior fixed casing of the mill. In dry crushing,if it is desired to remove the fine dust, the upper funnel {/c) is connected
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