The hydrometallurgy of copper . chambers are formed as shown in Fig. 18 by a tileprojecting up from the hearth, above the level of the ore, and a corres-ponding tile, forming part of the reverberatory arch, projecting downfrom above. This construction forms a supplemental chamber and leavesa slot between the roasting and supplemental chambers just large enoughfor the rabble arm to pass through. The rabble arm, at the slot, is usu-ally made rather wide and about an inch thick so that the slot may beas narrow as possible. The rabbles, extending from one side of the furnace to the other,are mount
The hydrometallurgy of copper . chambers are formed as shown in Fig. 18 by a tileprojecting up from the hearth, above the level of the ore, and a corres-ponding tile, forming part of the reverberatory arch, projecting downfrom above. This construction forms a supplemental chamber and leavesa slot between the roasting and supplemental chambers just large enoughfor the rabble arm to pass through. The rabble arm, at the slot, is usu-ally made rather wide and about an inch thick so that the slot may beas narrow as possible. The rabbles, extending from one side of the furnace to the other,are mounted on trucks on each side, and these trucks run on tracks inthe supplemental chambers. The trucks are attached to endlesschains which move about sprocket wheels at each end of the pair of these sprockets is driven by means of spurs and gears, whichin turn are actuated by a counter shaft driven by belt and pulley. The rabbles in passing through the furnace stir and advance the ROASTING FURNACES 105 I. .-i^ ^ g Ph pq. ^ 106 HYDROMETALLURGY OF COPPER ore, and issue quite hot; then elevated by the sprocket wheels at the otherend of the furnace to a track above, and returned to the feed end wherethey are again lowered by the driving sprockets and enter the reverbera-tory chamber to again complete the circuit. While returning, outsideof the reverberatory chamber, the rabbles are cooled enough so that nospecial cooling device is necessary. As each rabble enters the furnaceit takes with it from the feed bin the proportionate amount of orerequired to make the daily output. This may be regulated by the feedingdevice or by the depth of raw ore in the path of the rabble as it entersthe furnace. Counterweighted sheet iron doors at both ends of the furnace,hinged at the top, keep out the cold air; they remain closed except whenlifted by the rabbles in passing in and out. When the doors are opened,even momentarily, a strong inward draft is likely to set in; to avoid this,two doors
Size: 1092px × 2287px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400467, bookyear1912
