. Appleton's dictionary of machines, mechanics, engine-work, and engineering. The copper obtained in the first smelting operation is impure, and classes not higher than a rich mattor melted ore; its granules consist of copper, iron, sulphur, &c. This matt or coarse metal is once,more calcined in the calcining-furnace, and then subjected to another smelting, by which operation amore refined metal is obtained. The latter product is, however, not yet fine copper ; it is matt, whichcontains 60 per cent, of copper; it is granulated and roasted as before, and once more smelted, by?which a richer mat
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. The copper obtained in the first smelting operation is impure, and classes not higher than a rich mattor melted ore; its granules consist of copper, iron, sulphur, &c. This matt or coarse metal is once,more calcined in the calcining-furnace, and then subjected to another smelting, by which operation amore refined metal is obtained. The latter product is, however, not yet fine copper ; it is matt, whichcontains 60 per cent, of copper; it is granulated and roasted as before, and once more smelted, by?which a richer matt is obtained. These alternate operations of roasting and smelting are repeatedfrom seven to eight times before fine copper is obtained. The cause of this delay, or repetition of cal-cining, is found in the great affinity of copper for sulphur and arsenic, which it requires repeated fireand cooling to expel successfully. The refining of copper is done in the smelting-furnace, or a refining-furnace kept for the melting of the pigs is conducted slowly, so a
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
