(1) Cleaning and washing unit of sweet potato starch production line :
Sweet potato is transferred into the screw destone machine to be cleaned by washing conveyor . Most of sand and stone are removed out by de-stone machine. The sweet potato then goes into the next washing conveyor . During the transportation , the sweet potato will be washing agagin and again , and some peel of sweet potato is also peel off . Multi-stage wahsing and destone mahcine will make the potato total cleaned and transport to the crushing and milling unit.
(2) Crushing and Milling unit of sweet potato starch production line
The crushing and milling unit is the most important step for extracting potato starch. The cleaned sweet potato will be transport into crushing and milling machine. Highly-efficient curshing and milling machine will release the starch in sweet potato at most. Then the sweet potato slurry will be pump to next process.
(3) Centrifugal extracting unit of sweet potato starch production line
The sweet potato slurry is transferred to the 3 stage centrifugal sieves, each sieve works with a fiber pump and a defoam pump. The sweet potato slurry enters into each sieve to separate residue and starch. After 3 stages continuous washing and separation, the filtrate is sent to desanding unit, and the residue is sent to the residue dewatering unit.
(4) Sweet potato residue dewatering unit of sweet potato starch production line
The sweet 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.
(5) De-sanding unit of sweet potato starch production line
After separated with the residue, the crude starch milk is transferred to de-sanding cyclone by pump. The desanding cyclone divide the milk into two parts: the light part which contains the mixture of starch will go out from top of the cyclone, and the heavy part which contains the sand will be discharged out of the system.
(6) Concentration and refining unit of sweet potato starch production line
The starch milk after desanding process goes into the 18 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 15 stages of washing unit . 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.
(7) Vacuum dewatering unit of sweet potato starch production line
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 flash dryer by screw conveyor.
(8) Air drying unit of sweet potato starch production line
After dewatering process, the air flash dryer will dry the starch to the required moisture of the commercial starch. Then sweet potato starch will be packed into bags for sale or storage .
The sweet potato starch production line also can uesd for making starch from cassava or potato .
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