. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 277.—Section of Reverberatory Ro.\sting Furnace. therefore, are reduced to a finer grade than those of the gangue, andthus the mineral is in the most suitable condition for roasting. The appliances used for the roasting operation may be either re-verberatory furnaces and kilns built of brick, as in figs. 276, 277, ora variety of revolving roasting cylinders, or furnaces, built on the Stetefeldtor OHara principles. The furnace shown in fig. 276 is given for the sake of comp
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 277.—Section of Reverberatory Ro.\sting Furnace. therefore, are reduced to a finer grade than those of the gangue, andthus the mineral is in the most suitable condition for roasting. The appliances used for the roasting operation may be either re-verberatory furnaces and kilns built of brick, as in figs. 276, 277, ora variety of revolving roasting cylinders, or furnaces, built on the Stetefeldtor OHara principles. The furnace shown in fig. 276 is given for the sake of comparison REVERBERATORY FURNACES. 425 with the mechanical roasters, and may be either single or double, asthe one illustrated in the small chlorination mill (fig. 286). Reverbemtory Furnace.—Tht small single furnace shown in plan andsection in figs. 276 and 277 will treat one ton of sulphides at a charge. upon the hearth-bottom {a). It is fed in through a hole in the arched roof{g) and spread out in a thin layer upon the hearth, where it is exposedto the action of the heat and gases from the furnace, and at the endof the operation, during which it is raked over and stirred by hand throughthe side openings, it is discharged through the square opening {b) inthe floor into the pit {c) and is then removed to the cooling floor to 426 MACHINERY FOR METALLIFEROUS MINES. await the next process. The bridge (e) is from 10 in. to 12 in. wideand from 8 in to 10 in. high, and should be made of some refractorymaterial, like firebricks. It separates the hearth from the fireplace. Theoutside walls should not be less than 24 in. thick. The roof shouldnot be more than 20 in. from the bottom, and the whole constructionshould be well braced together by means of iron ties and wall-plates(/>). The smoke and fumes pass away through the flues (A and /) intothe chimney, on the top of which is a cover (;/) b
Size: 1251px × 1996px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
