Ore Dressing, Vol. 3 of 4 (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Ore Dressing, Vol. 3 of 4

Ore dressing appeared as a two-volume book in 1903. Since that time advances in the art of concentrating ores have been exceedingly rapid and in some instances well-nigh revolutionary. Investigations have been made for the purpose Of explaining the principles of ore separation, new concentrating devices have been invented and installed in the mills, and the mills themselves have been greatly improved. For these reasons the time seems to have come to bring the subject up to date. When this present work was started in Octo ber, 1906, it was thought that something in the nature Of a small supplement or appendix would suffice and on this basis the collection Of material was under taken. It soon became apparent that the new work would rank in size with Volumes I and II and hence naturally receive the titles Of Volumes III and IV. The idea of revising and rewriting Volumes I and II seemed to be prohibited by reason of the fact that the machines and the mills are so completely inter woven on almost every page that no method of revision appeared adequate to the task.

The new work has therefore taken the form of Volumes III and IV in which the subject-matter of Volumes I and II is added to chapter by chapter. In selecting machines for description the effort has been made to take only those machines that have found practical application. The four volumes have been indexed together and the complete index is inserted in each volume. Another feature of the book that will be noted is the insertion Of the mill numbers in a prominent place at the top Of the pages in Chapter XLI. It is hoped that both of these changes will add to the convenience and usefulness Of the book.

In Chapter XLI there will be found described ninety-four mills represent ing milling practice in the principal mining centers of the world. Many of these mills are given in great detail and contain figures as to costs, power, water, etc., that should be of the utmost value. Care has been taken in index ing to make this information available. Throughout this chapter tonnages are given in tons of pounds unless otherwise stated.

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