Electrochemical and metallurgical industry . ses beneathor into the midst of a constantly-replenished heat of porous orgranular material. The gases pass upward through the heap,and the filtering material collects the dust, and is graduallydrawn away from the bottom of the heap, while the top isconstantly replenished with fresh material. The gases thusencounter cleaner and cleaner material as they rise. Such afilter is stated to be specially useful in the treatment of thegases issuing from pyrites-burners. Suitable filtering mater-ials are coke, sand, crushed quartz, granulated slag, pumice,etc
Electrochemical and metallurgical industry . ses beneathor into the midst of a constantly-replenished heat of porous orgranular material. The gases pass upward through the heap,and the filtering material collects the dust, and is graduallydrawn away from the bottom of the heap, while the top isconstantly replenished with fresh material. The gases thusencounter cleaner and cleaner material as they rise. Such afilter is stated to be specially useful in the treatment of thegases issuing from pyrites-burners. Suitable filtering mater-ials are coke, sand, crushed quartz, granulated slag, pumice,etc. The arrangement is shown in Fig. 2. The gases are con-ducted into the heap by pipe c through downwardly-projectingorifices c, situated beneath a horizontal disc d, which createsa cavity in the middle of the heap. The gases pass offthrough /. Met.\llurgical Furnace.—^For the treatment of ores which requirea comparatively long exposure to heat, it is economical tomaterially increase the diameter of the ordinary McDougall. FIG. 2.—APPARATUS FORCLEANING GASES. furnace to secure an increased area for the hearth. With theusual construction this involves a difficulty in so far as the oretends to accumulate toward the center of the hearth and tochoke the furnace. In order to dispose of it as fast as it ac-cumulates, F. Klepetko (793,939, July 4) provides each rabble-arm with a series of rakes whose depths increase as they ap-proach the center of the furnace, so that the radically-effectivesweeping surface increases toward the center. The same in-ventor (792,053, June 13) modifies a detail of construction of the rabble arms described inone of his former patents. Forcooling purposes these armsare made hollow, and the in-ventor now provides them withribs on the inner surface, fol-lowing the general longitudinaldirection of the arm. C. and F. E, Marcy (794,-118, July 4) use a central hol-low shaft from which radiatethe hollow rabble-arms; air forcooling the
Size: 1215px × 2056px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
