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. 1914 Excerpt: ... S. Geol. Surv., 1882, p. 270. Howe, Bult. 26, U. S. Geol. Surv., 1885, p. 99. Lang, Eng. Min. J., 1890, L, 570. Min. Sc. Press, 1906, xcn, 136 (Editor), 138 (Neill), 197 (Mathewson), 215 (Bretherton) 279 (Hixon), 296 (Austin), 342 (Subscriber); 1907, xcrv, 114 (Charles), 815 (Neill). conclusion which is approximately ...
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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. 1914 Excerpt: ... S. Geol. Surv., 1882, p. 270. Howe, Bult. 26, U. S. Geol. Surv., 1885, p. 99. Lang, Eng. Min. J., 1890, L, 570. Min. Sc. Press, 1906, xcn, 136 (Editor), 138 (Neill), 197 (Mathewson), 215 (Bretherton) 279 (Hixon), 296 (Austin), 342 (Subscriber); 1907, xcrv, 114 (Charles), 815 (Neill). conclusion which is approximately correct; actual practice may be necessary to give a definitive answer. Some of the points are the following: The blast-furnace requires coarse ore; can make slags of high or low silicate degree, but requires generally much flux to obtain a slag of desired fluidity, and the large quantity of slag formed carries away much Cu although its assay-value is low; it eliminates impurities effectively, especially in pyritic work; uses a small amount of expensive coke; requires little labor but much power and cooling water; has small repairs; makes much dust; is cheap to build for a given tonnage; requires little space; locks up comparatively little capital. The reverberatory furnace, on the other hand, requires an extended roasting plant; is especially suited for fine ore (including the flue-dust of the blast-furnace); must make slags high in Si02 and is therefore restricted to siliceous charges using little flux, and the higher slag-assays for Cu may be balanced by the small amount of slag made; it consumes enormous amounts of cheap coal (replaced sometimes by oil); the labor cost is high, the power consumption is low, especially if there are waste-heat boilers; the original cost, the floor space, and repair will always remain large, as will the capital locked up in the bath of matte and the sandbottom. The metal locked up in the matte of a reverberatory furnace and a blast-furnace is about as 10: i. With most large plants both reverberatory and blast-f..
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