The Metallurgy of Zinc and Cadmium (Classic Reprint)

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Excerpt from The Metallurgy of Zinc and CadmiumBesides the analogies which the metallurgy of zinc presents with the other branches of industry enumerated above, it laps over into some others, so that no sharp dividing line can be drawn. Thus zinc ore occurs frequently in connection with lead ore and in the recovery of the two metals, the metal lurgy of zinc is intertwined with the metallurgy of lead, especially is this the case in the treatment of the se-called mixed sulphide ores. The chief ore of zinc, blende, is also valuable as a source of sulphuric acid, and many works recover the latter as a by-product. The zinc metallurgist is conse quently interested in the subject of sulphuric acid manufacture. Sulphuric acid manufacture is in itself, however, a subject which in technical magni tude is equal, if not superior, to the metallurgy of zinc, and in a treatise on the latter it would he obviously inadvisable to go extensively into the manufacture of the former, nor would such a digression be anything but futile, inasmuch as the manufacture of sulphuric acid has already been treated in a masterful manner by experts in that line. On the other hand, a treatise on the metallurgy of zinc which did not consider the question of making sulphuric acid from the gases derived from blende roasting would be seriously deficient. I have therefore summarized some of the data most useful to the zinc metallurgist, without making too great a digression from the main subject.The subject of fuel and its combustion has been treated at great length because of its surpassing importance. The principles of the combustion of coal are important in many branches of metallurgy, but in zinc smelting they are most important. There is no other of the chief metals of com merce which is produced at the expense of so much coal per pound of metal as is the case with zinc. The consumption of coal in smelting zinc ore is so great that it is an axiom in the industry that the ore must he carried to the coal rather than the coal to the ore. Even under that condition the cost of the coal constitutes with labor the chief items in the expense of smelting, in one place the cost of coal is the higher, in another place the cost of labor. The zinc metallurgist is obliged therefore to direct his attention pointedly to economy in the consumption of coal.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.