Process and apparatus for carrying out said process for the preconcentration of ores by induced measure of the superficial contents |
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| 申请号 | US3795310D | 申请日 | 1972-03-23 | 公开(公告)号 | US3795310A | 公开(公告)日 | 1974-03-05 |
| 申请人 | RECH GEOL MINIERES BUREAU DE; | 发明人 | JEAN CLAUDE ROBERT; BUCHOT P; COHEN ALLORO R; | ||||
| 摘要 | The concentration of a desired mineral in pieces of ore is determined by coating each piece with a fluorescent material that selectively adheres only to the exposed surfaces of the desired mineral. The pieces are then individually illuminated by ultraviolet radiation to fluoresce the selectively coated material. First photo-multipliers sense the magnitude of the fluorescence and a second photo-multiplier, which detects the shadow of the ore piece, yields an output proportional, after inversion, to the cross-sectional area of the ore piece. The magnitude value is then divided by the area value to indicate the concentration of the desired mineral in the ore piece, which may serve as a basis for automatically separating the pieces before further treatment. | ||||||
| 权利要求 | 1. An apparatus for effecting the precise preconcentration of specific minerals disposed on the surface of blocks of ore, comprising: at least two sources of radiation simultaneously irradiating a block dropping into a field of radiation common to the two sources, at least two photo-multipliers for transforming the radiations received into a first signal whose amplitude is proportional to the superficial content of each block of a given mineral, means for establishing a second signal whose amplitude is proportional to a pre-determined content of said given mineral, means for comparing the amplitudes of the first and second signals, and a mechanical selecTor actuated by the comparator each time the amplitude of the first signal is greater than the amplitude of the second signal. 2. An apparatus as claimed in claim 1, wherein the two sources are disposed on the same axis on opposite sides of the trajectory of the blocks, and further comprising a third source perpendicular to the axis of the two opposed sources, a red fluorescent screen being disposed perpendicularly to the axis of the third source and on the side opposed to that relatively to the trajectory of the blocks, two initial photomultipliers receiving the induced radiation of the blocks and a third photomultiplier receiving the radiation of the red fluorescent screen, an inverter receiving the result of the measurement of the third photo-multiplier, and a calculator, connected to the inverter and to the two initial photo-multpliers, to provide a value which is a function of the superficial content of each block. 3. Apparatus as claimed in claim 2, comprising two stations for determining the superficial content of each block, the axes of the sources and of the photo-multipliers of each station being displaced, through a certain angle relatively to the axes of the other station in order to produce a reduced radiation on the portion of the block not yet energised by the radiation of the sources of the other station. 4. An apparatus as claimed in claim 1 comprising two means of displaying pre-determined contents, two comparators to determine if the superficial content of the analysed block is less than the lowest quantity displayed, greater than the maximum content or between them, two selecting mechanisms and three selection passages in order to deflect the blocks of low, intermediate or high contents into the passages assigned to them. |
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