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amount apparatus arrangement average Belt Conveyor bins bottom breaker Bucket Bucket Elevator capacity carried cent centrifugal chute clean coal Coal Breaker coal washery coal washing compartment concentrating table cost crushers crushing deck dewatering elevator diameter discharge drum dryers dust efficiency Elmore feed filter fine coal float Flow Sheet galena gate grains hopper hutch impurities installation J. R. Campbell loading lump machine material mechanism method middle product moisture motion nut coal operation overflow Overstrom particles pass percentage perforations plates plunger possible pump pyrite quartz railroad cars raw coal removed revolving screens riffles sample scraper screening plant screw conveyor Section separation settling tank shaft shaking screens shown in Fig shows sieve sizes slate sludge recovery solids specific gravity speed Spitzkasten steel storage stroke sulphur surface tion tons per hour valve velocity wash water washed coal
Popular passages
Page ii - Coal Age v Electric Railway Journal Electrical \Xforld v Engineering News-Record American Machinist v Ingenierfa Internacional Engineering 8 Mining Journal ^ Power Chemical 8 Metallurgical Engineering Electrical Merchandising H g o .s a ELECTKOLITIC DEPOSITION AND HIDBOMETALLUBGY OF ZINC BY OLIVER C.
Page 29 - ... cannot be denied. In the English system itself, when the hutch products of one jig are treated upon another, we are making use of a preliminary sizing. Again, in order to jig an unsized product suction is necessary to effect a separation, and suction, as has been stated previously, results in cutting down the capacity enormously.
Page 332 - Some of the lenses, however, were of rather light weight and had a peculiar gray color. To the eye it appeared about 75 per cent pyrite by volume and the remainder was adhering coal. This material was tested in a preliminary way and the tests indicated that the same treatment could be used as with the material from the Eastland mine.
Page 25 - Very fine material, less than y1^ millimeter in diameter, can be treated successfully on jigs, if treated with coarse stuff, the concentration taking place in the small interstitial channels between the grains forming the mineral bed. For the treatment of fine stuff on jigs, close sizing is a positive disadvantage. Jigs work well on mixed stuff, and very badly on fine stuff alone.
Page 29 - ... clearly indicated. This has been recognized in some quarters, but a wider use than has hitherto been accorded it appears to hold out favorable inducements. This seems to be a field eminently suited for the English methods of jigging — one that is not and cannot be filled by the Continental system. (8) The arguments that have been advanced for the adoption of the English system on the ground that equal-settling ratios, many times larger than those obtainable under free-settling conditions, exist...
Page 29 - English system; that is to say, towards the use of the jig in the treatment of unsized material instead of the hydraulic classifier. While the treatment of material sized between wide limits is possible and thoroughly practicable, still the advantages resulting from a preliminary sizing cannot be denied. In the English system itself, when the hutch products of one jig are treated upon another, we are making use of a preliminary sizing. Again, in order to jig an...
Page 328 - ... pyrite from the mines of the Bon Air Coal and Iron Corporation, to learn if the material could be mechanically treated to produce a pyrite of commercial purity. COAL PYRITE RESOURCES IN TENNESSEE.* Outside of the large deposits of pyrite and pyrrhotite in East Tennessee in the Ducktown region, Tennessee has an additional source of pyrite from certain of the coal seams of the Cumberland Plateau. The mines in the Bon Air-Clifty district all contain pyrite in the form of bands, nodules and kidneys,...
Page 56 - With too small a plate the impurities will go to the pump with the coal. With too large a diameter the coal will not be carried along with the current but will be lost with the slate. Once regulated for a given coal, the results are very satisfactory. Fitted to this tank is a valve for supplying the fresh water needed by the washer, automatically regulated by a float "g.
Page ix - That the Secretary of the Interior, through the Director of the Bureau of Mines and the Director of the Geological Survey, is hereby authorized and directed to make scientific, technologic, and economic investigations concerning the extent and mode of occurrence, the development, mining, preparation, treatment, and utilization of ores and other mineral substances...
Page 329 - ... district. Clean samples of pyrite were taken from some of these mines, which gave the following analyses:2 Fentress Coal Co., Wilder, Tenn 46.4 per cent sulphur Peacock Mine, Big Mountain Coal Co., Obey City, Tenn., Weathered surface pyrite 46.1 per cent sulphur Hand cobbed samples of pyrite were also taken from these mines, so as to show the approximate percentage of sulphur in carload lots of unwashed pyrite as it would be shipped from the mines if no *The paragraphs under this subheading were...