Electrochemical and metallurgical industry . o the atmospherethrough a regulating valve, the upper ends extending into theroasting chamber in close proximity to the gas exits. Theair. heated in its passage through the producer walls, mixeswith the gas upon extrance to the roasting chamber, and com-bustion is spontaneous. The flame traveling radially acrossthe hearth finally discharges through a series of tile p»pesinto a large circular smoke flue supported on steel framework just above and around the outer edge of the will be noted that while the hearth resolves, the mainfurnace str
Electrochemical and metallurgical industry . o the atmospherethrough a regulating valve, the upper ends extending into theroasting chamber in close proximity to the gas exits. Theair. heated in its passage through the producer walls, mixeswith the gas upon extrance to the roasting chamber, and com-bustion is spontaneous. The flame traveling radially acrossthe hearth finally discharges through a series of tile p»pesinto a large circular smoke flue supported on steel framework just above and around the outer edge of the will be noted that while the hearth resolves, the mainfurnace structure is stationary. February, I905.] ELECTROCr-TEMTCAL AND METALLITRGICAL INDUSTRY. 87 The rabble trms, of which there are four sets, extend downthrough the arched roof of the roasting chamber, and allcooling water connections and adjustment of the angularity the temperature in the roasting chamber is under completecontrol of the operator at all times, and, as the angularity ofthe rabble blades can be changed quickly and easily, the time. PIG. I —CROSS-SECTIONAL VIEW OF HOLTHOFF REVOLVING HEARTH ROASTING FURNACE. of the rabble blades are accomplished outside of the rabble arms consist each of two pieces of cast-iron pipeof different diameters, one within the other, the outer pipebeing tapped into the hollowrabble blade. This arrangementis a simple and effective meansfor water-cooling the rabbles. The ore, fed through a feed-er having an adjustable ec-centric and a spiral conveyorextending through the outerwall of the furnace, drops onto the outer edge of the hearth,and, as the hearth revolves, israbbled across same in a spiralpath. Reaching the inner curbof the revolving hearth, it dropsthrough discharge spouts on tothe inner edge of the stationarycooling floor located directlyunder the revolving hearth. Itis then moved across the cool-ing hearth and finally dischargesat the outer edge of the coolingfloor into a revolving hopper orto a belt conveyor or elevator
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
