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mining inry grinding ball mill grinding ball mill

mining inry grinding ball mill grinding ball mill

in fact, the shells were the liners, but lifters with moderate projections always were employed. Drum feeders were used in preference to scoop feeders. The mounting of the mills was of the tire and roller type, thus leaving the ends accessible for changes. The mil...

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The ball loads are illustrated in table 2. The first two loads have the designation Davis because Davis ingeniously developed the formula from which the sizing analyses were derived. He took into account rate of wear of the different sizes and derived a load balanced against that wear when the renewal and rejection sizes were given. His formula considered nothing but balance. He did not question the adaptability of his certain distribution of ball sizes to the particular distribution of particle sizes. In the present paper an attempt has been made to ascertain the amount of a given size of balls required for an estimated amount of a given particle size of ore, and this new load is called the rationed load. The rationed loads are the result of a more or less scientific system of reasoning , in which the ball size is not only best adapted to the particle size but also the amount of balls is rationed to the amount of the particle sizes and takes into account the f...

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Square mesh screens were used to obtain the sized products in the various tables. At an early date, flakiness had been studied by screening on square hole screens, then screening each size on a rectang screen of a selected size. The amount that passed the rectang gave a measure of flakiness. There it was shown how flakiness varies in successive steps of grinding. This procedure and other methods for flakiness tests would be necessary if absolute surface values were required or if different types of grinding machines needed close scrutiny, but in this work it was deemed desirable to stick to the regular methods until more elementary things had been worked out. The work has been conducted in such manner that, although many surface calculations are made by a method already outlined, they are little more than supplementary. That is, the ultimate results, as based on square hole screens, may be seen at a glance, then surface calculations are made so as to combine the several characteri...

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In accordance with one of the first papers, the grinding rate or capacity and the grinding efficiency are expressed as surface tons per hour, and surface tons per horsepower hour, respectively. Some calculations were again carried out in full in a later paper. This method has been used for several years by one of the largest mining companies, which has supplied the Bureau with many photostats of plant tests. The method simply applies the well established inverse ratiosthat is, for example, the amount of surface in a unit weight of a ½ inch product is twice that of a 1 inch product and, similarly, the amount of surface in a unit weight of a 200 mesh product is twice that of a 100 mesh product. It was convenient to set the number 1 as a unit of surface of a unit weight of 1 inch material. By inverse ratio 361 is the units of surface in a unit weight of 150 to 200 mesh product. These units may be extended beyond the subsieve sizes after elutriation. Absolute values may be assigned af...

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First will be given the results in batch and open circuit grinding, after which closed circuit grinding will be taken up.

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