The application discloses a
separation system for recycling leaf filter waste residue in an
alumina production process, comprising a pressure separation device, a
feed pump connected between a leaf filter waste residue
slurry source and a feed inlet of the pressure separation device, an external tank
dilution circuit, an overflow outlet of the pressure separation device connected to an inlet front end of the
feed pump through a shunt pipeline, a underflow pump connected to an underflow outlet of the pressure separation device, a vacuum
belt filter connected to an outlet of the underflow pump, a pulping tank arranged below a
filter cake discharge outlet of the vacuum
belt filter, and a conveying pump connected between an outlet of the pulping tank and a pre-desilication process of an
alumina production
system. Through the synergistic effect of high
solid content mud layer
sedimentation technology and external tank
dilution technology, the industry problem that leaf filter waste residue is difficult to settle, concentrate and filter and separate due to easy
hydrolysis under the condition of low caustic alkali concentration and low molecular ratio and a large amount of fine planktonic matter is effectively solved.