Handbook of Ore Dressing, Vol. 1

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Excerpt from Handbook of Ore Dressing, Vol. 1: Equipment and PracticeA recognized authority defines2 ore dressing as the prepa ration Of the ore for the smelter by mechanical means whereby the valuable minerals are concentrated into a smaller bulk and weight by the separation of some Of the waste, or whereby two valuable minerals are separated from each other.' A detailed criticism Of this definition might result in an involved discussion as to acceptable interpretations of ore and waste, and the first difficulty in dealing with the phrase is encountered. To cleanse a mineral like graphite from impurities means the removal of non-graphitic material, and this is insured by a series of graphite-dressing Operations. To cleanse an ore should necessitate nothing more than the removal Of waste, as distinct from ore, and this is usually achieved by picking and washing, accompanied sometimes by primary crushing. Hence the need of explaining that whereas graphite dressing means the dressing of graphite, ore dressing has been adopted to mean much more than the dressing of ore.A second definition then followed3 in which ore dressing was defined as the process of mechanically separating and saving valuable minerals from the valueless material of an ore whereby its valuable minerals are concentrated into smaller bulk and weight by discarding some of the waste, or the process of mechan ically separating two or more minerals, which combined have little value, into two or more products, each of increased value.The various processes involved in the extraction and recovery Of the valuable portions of an ore have specific designations. The problem is to know where to draw the line as to which of them is to be included in ore dressing. The treatises in which these two latter-mentioned definitions are found make especial mention of amalgamation and concentration as phases of ore dressing, but the definition would also include other specialized recovery processes. The same authority defines coal dressing as the removal from coal Of the impurities which it always contains. This is a literal adaptation of one of the dictionary definitions of the term. If the interpretation to cleanse from impurities is to be taken as definitive Of the verb to dress, ' then the term ore dressing cannot logically be used to repre sent operations such as graphite dressing, gold dressing or coal dressing.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.