Bulletin of the United States Geological Survey Volume 24-30
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 edition. Excerpt: ... of copper. Though far more basic than the ore furnace slag, the. sand adhering to the blue metal and the silica greedily absorbed from the hearth aud fettling by the oxides of iron formed in the roasting generally make it rather more acid than a siugulo-silicate; (2) a generally spongy matte called "regule," with more or less moss copper; (3) copper bottoms, generally very impure, and reserved till a sufficient amount has accumulated to Bull. 26 5 (487) make a special refining charge for copper of inferior quality. In treating auriferous materials most of the gold concentrates in these bottoms, which are specially treated for that metal. Le Play gives the following analyses: 5. ROASTING-SMELTING THE RAW WHITE METAL AND REGULE FOR BLISTERED COPPER. THE AIM. The aim of this operation is to expel as sulphurous acid the sulphur which up to this point has been retained to effect the reduction of the oxides and silicates of copper inevitably formed while oxidizing the iron. The conditions at the same time favor the expulsion of arsenic and antimony, and the scorification of the heavy metals (Su, Ni, Co, Mn, Fe, etc.) present in small amount. THE OPERATION. The operation (see Table VI, columns 6,9, and 25 is performed in furnaces similar to the smelting furnaces already described, and provided with air ports. The present tendency is to greatly increase the size of the "roasters," as these furnaces are called, and one has lately been constructed with a capacity of 35,000 to 50,000 pounds at each charge. Both labor and fuel are greatly economized by increasing the size of these furnaces. The labor, after the furnace is charged, consists almost wholly in overseeing the operation and managing the fire, the work of skimming the slag...
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