Processing Technology of crude Potato starch

technological process

Potato → cleaning → grinding → potato dregs separation → precipitation → drying → crude starch

Key points of operation

(1) Grinding: select starch-rich potatoes, pick out rotten and diseased potatoes, put them into the washing tank, add clean water and stir with sticks to clean the potatoes. The washed potato cubes are put into the grinder, grind with water, grind into starch pulp and flow into the receiving tank.

(2) Separation: sift out the potato dregs in the starch pulp with a coarse and fine sieve, or put the starch paste into a cloth bag, tie the mouth of the bag, put it into the tank, step on it with your feet to make the starch overflow from the hole of the bag, and then tread the potato residue with water.

(3) precipitation: put the starch milk into the sedimentation tank, stir fully, and stand for more than 5 hours, then the starch precipitates in the bottom layer. Remove the upper clarifier, that is, separate the starch. There are many starch impurities separated at one time, which can be stirred by adding water in the washing tank, stand still for several hours, and then remove the clarified liquid above. After washing for 3 times and 4 times, the upper layer is outer skin, the middle layer is starch, and the lower layer is sediment. Scrape off the impurity from the upper layer and remove the middle starch layer, which is called wet starch.

(4) drying: cut the wet starch into small pieces, then spread it in a bamboo screen or shallow wood plate, and bask in the sun until the starch is broken at a touch, or it can be dried manually.