| 摘要 |
PCT No. PCT/AU87/00185 Sec. 371 Date Dec. 22, 1988 Sec. 102(e) Date Dec. 22, 1988 PCT Filed Jun. 29, 1987 PCT Pub. No. WO88/00095 PCT Pub. Date Jan. 14, 1988.The density of the material in the jig bed is measured in consecutive short segments over the jig cycle, the time period of each segment being not greater than one-tenth the cycle time of the jig, to determine the density signature or profile of the jig. By controlling the operating parameters (e.g. inlet and outlet valve opening and closing, underbed flow rate, discharge gate position and jig working air pressure) of the jig, the density signature or profile is maintained within a control envelope for efficient stratification of the mineral.
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