| 摘要 |
PROBLEM TO BE SOLVED: To shorten an adjusting time whole enhancing adjusting accuracy by utilizing difference in electric conductivity even if troublesome operation such as operation for separately adding fluid, or the like is not performed. SOLUTION: In fractionating a suspended substance from a suspension fluid by buoyancy, wherein the suspended substance having electric conductivity different from that of a conductive solution is suspended in the conductive solution, a container 1 housing the suspension fluid, the electrode 2 provided in the container 1 to allow a current to flow to the suspension fluid and a magnetic field applying means 3, which applies a magnetic fluid to the suspension fluid so that Lorentz force increasing the buoyancy of the suspended substance acts on the conductive solution, are provided. When a current is allowed to flow to the suspension fluid housed in the container 1 by the electrode 2, the Lorentz force acting on the conductive solution can allow large force to act on the suspended substance in cooperation with gravity and, as a result, large buoyancy can be applied to the suspended substance.
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