Kurita Machinery Manufacturing Company Limited

Atsushi Takashima

Tetsuya Kurita

Katsutami Shibasaki

A filtration method includes steps of feeding liquid to be filtered into a filter medium between a fixed plate and a movable plate; and reducing capacity of a filter chamber formed by the medium by moving the movable plate in a direction in which the movable plate presses the fixed plate through the medium so as to perform expressing filtration of the liquid and to produce cake. The reducing step comprises alternately repeating at least one time an expressing pressure-increasing process for increasing pressure in the liquid in the medium by a specified increment in the filtration of the liquid, and an expressing pressure-maintaining process for maintaining the pressure constant during a specified period, so that the filtration is performed under a specified pressure corresponding to a desired water content of the cake to produce the cake. A filter press for employing the method has the filter medium arranged between the fixed plate and the movable plate capable of moving toward and away from the fixed plate. The press comprises a driving device for driving the movable plate to move toward and away from the fixed plate; a pressure sensor arranged at one of the movable plate and the fixed plate and measuring pressure in the chamber; and a control unit for controlling the expressing filtration of the liquid by control of drive of the driving device on the basis of a signal outputted from the sensor.

Filtration method and filter press for employing the method

The present invention relates to a filter press. The filter press includes a plurality of filter plates each of which comprises a filter frame having a space therein. The filter plate has a simple construction, providing the effect of reducing the weight of a filter press as a whole and protecting a filter press from damage by the filtering compression.

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Kobe, Japan

Atsushi Takashima