| 摘要 |
1287274 Froth flotation WESTINGHOUSE ELECTRIC CORP 3 Sept 1969 [26 Sept 1968] 43653/69 Heading B2H [Also in Division G3] The supply of frothing agent to a floatation separator is automatically controlled in dependence on a computation of the thickness of the layer of froth on the liquid from signals corresponding to contact of a moving probe with the upper and lower surfaces of the layer. In Fig. 1, the electrical probe 16 is withdrawn and reinserted periodically by an electric motor 22 and the thickness is determined by a computer 36 which regulates the supply of frothing agent (e.g. pine oil) at 24 to maintain the thickness constant. Computer 36 also controls an outlet valve 33 to maintain the slurry at such a level that only froth, with the separated minerals, overflows a weir at 15. Probe 16 may be cleaned between insertions. In a modification, a number of cells are mounted on an adjustable ramp so that froth cascades from cell to cell. The froth thickness and slurry level are controlled in each of a number of cells sequentially by a computer which also controls the outlet of slurry from the lowest cell to correct the slurry level in it, and the slope of the ramp to maintain a desired relationship between the slury levels in all the cells. |
