. Transactions of the Institution of Mining Engineers . iiWASHED COAL Fig. 5.—Arrangement of Trough in First ExperimentalRe-washing. placed beneath the second (Fig. 6). The Rheolaveur 1921-1922.] FKANCE-FOCQUET AND MITTON NOTES -ON COAL-WASHING. 227 value T. Suppose also that the quantity of the waste evacuatednormally is q per ton of raw coal. Now regulate the Rheolaveurs forfinal shale so that they evacuate regularly this quantity q of shale. As coal varies in composition—that is to say, contains in certain•cases a maximum quantity q of shale per ton—it is necessary to jDrovidefor an overwei
. Transactions of the Institution of Mining Engineers . iiWASHED COAL Fig. 5.—Arrangement of Trough in First ExperimentalRe-washing. placed beneath the second (Fig. 6). The Rheolaveur 1921-1922.] FKANCE-FOCQUET AND MITTON NOTES -ON COAL-WASHING. 227 value T. Suppose also that the quantity of the waste evacuatednormally is q per ton of raw coal. Now regulate the Rheolaveurs forfinal shale so that they evacuate regularly this quantity q of shale. As coal varies in composition—that is to say, contains in certain•cases a maximum quantity q of shale per ton—it is necessary to jDrovidefor an overweight of shale which is not taken out by the finishing. Fig. 6.—Existing Arrangement of Troughs and Re-washing by Elevator. Hheolaveurs, and which is equal to Q — Tq — Tq. This overweight must,therefore, be taken away by the rewashing elevator. Generally, it is known that the supply of the rewashing elevator issuperior to this quantity Q. This is owing to the fact that incorporatedin this product is a rather important quantity of (?2 of middlings,which it is possible to circulate in the plant throughout an
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
