PDF BookA practical treatise on metallurgy; adapted from the last German edition of Prof. Kerl Metallurgy Volume 1-2

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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. 1868 edition. Excerpt: ...the mass under treatment were collected--In fine silver, 79-491 per cent. In cement copper 0-951 per cent. In marketable intermediate products 4-980 per cent. In fume 1-314 per cent. In residues 3-976 per cent. Total loss of silver 9-288 per cent. The loss of silver in the first six months of 1862 amounted to--13-57 Per cent. This amount was contained in the following proportions:--In raw copper 9-82 per cent. In copper matt 2-81 per cent. In slags 0 41 per cent. The copper was obtained from the substances under treatment as follows:--In raw copper 7237 per cent. In cement copper 0271 per cent. In copper matt 19833 per cent. In marketable intermediate products 1/044 Per cent. In smoke 0396 per cent. In slags 2 835 per cent. Loss of copper 3-23 per cent. Augustin's Process for the Treatment of Speiss. The treatment of speiss is generally very difficult, on account of antimony and arsenic contained in it, but it has occasionally given satisfactory results,--at the Stephanshutte, in Hungary, for instance. Ferientsik extracted the silver completely, and 87 per cent of the copper from argentiferous speiss. The hot solution of common salt employed for lixiviating the silver contained some chloride of iron, and the residues contained 4 per cent of copper. A loss of about 4 per cent of silver took place when treating this speiss by the amalgamation process. The argentiferous speiss, containing 44 per cent of antimony, 27 per cent of copper, 20 percent of iron, 3 per cent of sulphur, 2 per cent of arsenic, bismuth, cobalt, nickel, silver, and gold (only o'oo32), is roasted at a low temperature in quantities of 9 cwts. for 5 hours on the upper hearth of a double roasting furnace, and afterwards on the lower hearth for the same time; it is then lixiviated....
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