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24 hours amperes apatite arators armature assays attracted ball mills belt conveyor belt separator beneath briquetting bucket elevator calcined capacity cassiterite cent centrate chalcopyrite clean Cleveland-Knowles coarse concentrate carries conveyor belt crushed to pass crusher cylinder delivered diameter discharge drum dryer dust employed feebly magnetic galena gangue garnet Grondal Type hematite Humboldt-Wetherill separators iron jigs launder leucite limonite lines of force magnetic blende magnetic concentrate magnetic field magnetic minerals magnetic oxide magnetic particles magnetic product magnetic separation magnetite marcasite material Mechernich mesh metric tons middling product Mining monazite nonmagnetic product operation oversize permeability phosphorus plant plate pole pieces primary magnet product carrying pyrite pyrrhotite quartz removed revolution revolving rhodonite rolls screen separating zone Separator This machine siderite sizes slime specific gravities strongly magnetic sulphide sulphur Sweden tailing product tons per hour treated treatment trommel Type V separator volts Wenstrom wolframite zinc concentrate
Page 198 - AN INITIAL FINE OF 25 CENTS WILL BE ASSESSED FOR FAILURE TO RETURN THIS BOOK ON THE DATE DUE. THE PENALTY WILL INCREASE TO SO CENTS ON THE FOURTH DAY AND TO fl.OO ON THE SEVENTH DAY OVERDUE.
Page iii - PREFACE THIS book has been prepared to gather into convenient form the published information on the magnetic separation of ores. The compilation has been supplemented by data from the writer's observations and an extensive correspondence with mill managers and manufacturers.
Page 139 - Siderite is usually mixed with from 3 to 5 per cent. of fine coal, or coke, before calcination, to aid in its decomposition and to insure a reducing, or neutral, atmosphere in the furnace : if coal is used it must be of a noncoking variety.
Page 148 - The plant comprised two furnaces, each of which required the attention of one man, who also trammed the calcined ore to the cooling floor. When the ore had cooled to 50° C., or lower, it was elevated to a trommel which diFIG.
Page 6 - There occur in nature many combinations of minerals whose specific gravities are too similar to permit of their separation by any of the usual concentrating devices. In such combinations where one of the minerals is magnetic, or may be rendered magnetic by the application of heat, magnetism offers an efficient, and often the only, method of separation. For reasons connected with the subsequent reduction of zinc ores the presence of iron is highly objectionable, and ores which carry more than a small...
Page 148 - B, which made two products, one enriched in zinc and one enriched in iron. The iron product of both machines was led to D and the zinc product to C. The two lower machines made a zinc product with 38 to 42 per cent.
Page 86 - ... per cent. The New Bed and Harmony ores are low in phosphorus and vary in iron from 40 to 69 per cent. All of the above ores have a more or less coarse crystalline structure, that admits of easy disintegration and consequently very efficient concentration...
Page 99 - The skips are of the open, flat form used in quarry work and are suspended by two chains and hooks at the front end and...
Page 9 - It must make a proper presentation to the magnetic field of the mixture to be separated ; it must bring about the attraction of the magnetic particles by a uniform field of suitable intensity; it must remove the magnetic particles so attracted from the field and cause their discharge from the separator.