. Transactions of the Institution of Mining Engineers . Fig. 9.—Section of Sealed Apparatus and Elevator. evacuate a product of intermediate specific gravity (being a combinationof coal and shale), known as middle product, allowing clean coal to passover the end of the trough, where it joins Avashed coal from two uppertroughs (Fig. 7). 1921-1922.] FRANCE-FOCQUET AND MITTON NOTES ON COAL-WASHING. 229. Fig. 10.—Section ofRheolaveur, showingAction of Flap-valve. (2) By treating the products of the third trough by four supple-mentary apparatus, Nos. 1 and 2 of which evacuate shale, to be rewashedi
. Transactions of the Institution of Mining Engineers . Fig. 9.—Section of Sealed Apparatus and Elevator. evacuate a product of intermediate specific gravity (being a combinationof coal and shale), known as middle product, allowing clean coal to passover the end of the trough, where it joins Avashed coal from two uppertroughs (Fig. 7). 1921-1922.] FRANCE-FOCQUET AND MITTON NOTES ON COAL-WASHING. 229. Fig. 10.—Section ofRheolaveur, showingAction of Flap-valve. (2) By treating the products of the third trough by four supple-mentary apparatus, Nos. 1 and 2 of which evacuate shale, to be rewashedin the plant, whilst the other two give nearly pure middle product over the end of the trough is brought into a hopper to berewashed (Fig. 8). II.—Washing of Large Sizes. The washing of large coal from -f^ inch to 3J inches is based on thesame principle as the washing of fines. Here, however, a single trough is used, fitted with only twoRheolaveur apparatus. These are necessarily larger than those fordealing with the fines, on account of the greater volume to be apparatus are each fitted to a sealedelevator having perforated buckets, whichallow of the discharge of material withoutloss of water (Fig. 9). In the treatment of fines an ascending-current of extremely low velocity is suffi-cient to allow the particles of coal to passover the slot, which can be relati
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
