| 摘要 |
PURPOSE:To stably take out a concentrate with definite concn., by providing a supply amount variable type supply means for supplying a material to be treated to a decanter, a densitometer for detecting concn. of the concentrate from the decanter and an operational controller. CONSTITUTION:An operational controller 12 inputs the signal outputted from a densitometer 11 to compare the detected concn. value with a preset reference value and, when the detected water content is higher than set water content, a control signal is outputted to a differential speed generation means 7 so as to reduce the differential speed of a rotary cylinder 5b and an outer cylinder 5a. As a result, because the stagnation time of the liquid supply in a decanter 5 becomes long, dehydration is well performed and the water content of a concentrate is lowered. Contrarily, when the water content of the concentrate detected by the densitometer 11 is lower than reference water content, a signal is outputted to the differential speed generation means 7 so as to make the differential speed of the rotary cylinder 5b and the outer cylinder 5a large.
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