The potato starch industry separates the components of the fresh potato: potato starch, protein, cellulose envelope, soluble fractions .To extract potato starch from fresh potato starch, the potatoes are crushed; the potato starch are released from the destroyed cells. The starch is then washed out ,refining and dried to potato starch powder.
How to extract potato starch from fresh potato ?
The extraxtion process of potato starch from fresh potato as below :
(5) Potato residue dewatering unit:
The potato residue will be pumped to the centrifugal sieve for dewatering, the centrifugal sieve works like the extraction sieve. Then the screw conveyor discharges the residue out of the process, and the water will go back to the process water system.
Potato starch extract used main machines
(6) De-sanding cyclone unit:After centrifugal extracting, the starch milk is transferred to de-sanding cyclone by fiber pump. The hydro-cyclone divide the milk into two parts: the light part which contains the mixture of starch and protein will go out from top of the cyclone, and the heavy part which contains the sand will be discharged out of the system. After desanding ,the material is sent to concentration and refining unit.
(7) Concentration and refining unitThe starch milk from centrifugal sieve goes into the 16 stages of refining hydro-cyclone, and fresh water comes into the cyclone from the end of system. Firstly, starch milk is pumped into 3 stages of concentration unit to remove the water, then the condensed starch milk enter the next 13 stages of washing unit, and the overflow enters into another 2 stages of recycle unit to recycle starch. Most of the effluent with fiber is discharged out of the process, and a little part goes back to the process water system. Finally, the condensed starch slurry is pumped into the starch slurry storage tank.
(8) Vacuum dewatering unit:
The starch slurry is pumped into inlet tank of vacuum dewatering machine. Then the vacuum rotary drum will adsorb the starch on the drum surface and the filtrate is transferred out of the system by filtrate pump. The filter cake on the drum will be peeled off by peeler and then transferred to the air dryer by screw conveyor.
(9) Air drying unit:
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