Cassava starch is processed in much the same way as potato starch and sweet potato starch. The process includes cleaning, peeling, coarse crushing, fine crushing, screening, washing, sedimentation, separation, dehydration and drying. In small-scale production, manual peeling can be used, and the lignified part should be removed before processing to avoid clogging or damaging the rubbing blade. The resulting crude starch can be repeatedly refined by adding water, or it can be washed with 0.3% sodium hydroxide solution, sulfur dioxide, bleaching powder, etc. to improve the whiteness of the starch. The starch taken out from the sedimentation tank has a moisture content of about 50% and can be dried in the sun, usually for 3 to 4 days.
In factory production, the outer skin can be removed while the potato pieces are being cleaned by a washing machine, leaving the inner layer containing starch, which can be recycled in subsequent processes. After the potato cubes are washed, peeled and crushed, the cells are immediately destroyed and starch is released. Depending on the starch content of the potato pieces, first use a decanter centrifuge to concentrate the potato pulp to 40-45% DS (the percentage of dry matter in the weight of the potato pulp). At this time, 65-70% of the protein and hydrogen cyanide in the potato pulp The acid is separated out, thereby reducing the water consumption of subsequent processes (such as sieving, centrifugation) and improving starch quality. Then use a disc centrifuge to separate the starch milk into three stages. Even very fine fibers can be removed. The waste liquid discharged from the centrifuge can be used in other processes (such as rinsing potato pieces and used in the previous separation). process flushing water, etc.). Then use a vacuum filter or centrifuge to dehydrate. After dehydration, the moisture content of the starch milk can be reduced to 42% and 37% to 38% respectively. Finally, use an air dryer to dry to the required moisture. In order to prevent the starch granules from sticking in the dryer during drying, the temperature of the starch granules must not be higher than 50°C.
The quality standards of cassava starch are: moisture 11% to 12% (maximum 12.5%); ash content less than 0.15%; pH value 5 to 6; more than 99% of starch granules can pass a 140 mesh sieve. Henan Huatai supply different capacity cassava starch production plant, any need please email to [email protected]