A centrifuge is a separation machine that uses centrifugal force to separate a suspension or emulsion. The main coarse portion of the centrifuge is a rotating drum that rotates at a high speed to generate a centrifugal force field, and the material to be separated is placed therein.
According to the separation principle, the centrifuge can be divided into two types: sedimentation type and filtration type.
The filter centrifuge is used to separate the suspension, and the drum has a small hole in the wall of the drum, and a screen or a filter cloth is arranged in the drum. Depending on the material, the material should be added while the drum is stationary or rotating. When the drum rotates, the liquid in the suspension is pumped out of the drum through the filter and the small holes in the drum wall under the centrifugal force, and the solid phase is trapped on the screen to form a layer of filter residue. The filter residue can be discharged manually after the drum is stopped, or discharged by mechanical means while the drum is rotating.
The decanter centrifuge can separate the suspension or the emulsion, and there is no hole in the drum wall. When the drum rotates, the components having different specific gravities are separated from each other by the centrifugal force. When the suspension is separated, the solid phase is deposited on the drum wall, and the surface of the solid phase is a liquid which is distributed in a ring shape; when the emulsion is separated, the material is divided into two concentric liquid rings, the outer ring is a liquid having a relatively high density, and the inner ring is a density. Small liquid in the saddle. When the suspension is separated, the material is added after the start of the centrifuge, and the discharge condition is the same as that of the filter centrifuge. When the emulsion is separated, the discharge of the feed and the separation are continuously performed while the drum is rotating.
The separation factor f is the multiple of the centrifugal acceleration of the material at the time of centrifugation to the earth's gravitational acceleration: f = Rw2 / g,
Where: R: the inner radius of the drum (m)
w: angular velocity of the drum (in radians/second)
g: Earth's gravitational acceleration (m/s 2)
The centrifugal separation operation intensity of the centrifuge is proportional to the separation factor.
This article was edited by the laboratory instrument - Hunan Gilson Technology Development Co., Ltd.
Human chorionic gonadotropin is a hormone for the maternal recognition of pregnancy produced by trophoblast cells
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