Annual report of the State Mineralogist for the year ending ... . atory andblast furnace processes. The hearth process also permits an interruption of the operation atany stage without great loss of temperature. Peat or wood may be used as fuel where coal or coke is not obtainable. These reasons recommend the hearth furnace in places Avhere anotherkind of furnace might otherwise be used, and particularly to smallersmelting establishments. Very pure galena ore may be treated direct in the hearth furnace;impure ores have generally to be roasted previously. In the Scotchhearth a cold blast is use
Annual report of the State Mineralogist for the year ending ... . atory andblast furnace processes. The hearth process also permits an interruption of the operation atany stage without great loss of temperature. Peat or wood may be used as fuel where coal or coke is not obtainable. These reasons recommend the hearth furnace in places Avhere anotherkind of furnace might otherwise be used, and particularly to smallersmelting establishments. Very pure galena ore may be treated direct in the hearth furnace;impure ores have generally to be roasted previously. In the Scotchhearth a cold blast is used, while in the American a saving of fuel iseffected by using a hot one. THE SCOTCH HEARTH PROCESS. The operation is commenced by filling the hearth with peat and ignit-ing it by placing a burning piece before the blast. After the fire has increased somewhat a few shovelfuls of coke arethrown on it, and upon this a mixture of oxysulphides, undecomposedore, coke rubbish, and coke is charged. As soon as all the lead contained 820 REPORT OF THE STATE
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Keywords: ., bookcentury1800, booksubjectgeology, booksubjectminesandmineralr
