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Sweet potato starch processing
The processing of refined white starch with sweet potato is very simple and can be processed on a large scale. A household can also produce small quantities. However, it is necessary to use sweet potato varieties with high starch content and use more advanced processing machinery for fine processing. The specific methods are as follows: 1. Select sweet potato varieties with high starch rates. There are many varieties of sweet potato, starch type starch varieties should be selected. According to my local processing practice, it is better to choose "Lu Xuan No. 1", "a litter of red", "Victory No. 100", "868" and other red-skinned starch-type fine varieties. These varieties are cultivated on sandy soil, hillsides, hills, and low-lying clay lands. The extraction rate is generally around 18%-25%. Second, choose the processing machinery. At present, there are various types and types of potato processing machinery on the market, depending on the size of the processing and the amount of processing, the mechanical properties are good, the degree of automation is high, the rate of powder extraction is high, the durability is strong, the applicability is strong, and the operation is simple. Convenient potato refiner separator, slag separator, automatic stripping machine, automatic roll bending machine and other machinery. Third, the production of starch sedimentation tank. Depending on the size and quantity of the processing, it can be made of cement, bricks or soil (with a plastic sheet inside). It is made into a pool or a machine with multiple pools of starch slurry sedimentation tanks, or a starch precipitation tank for refining starches. Leave the outlet on the pool side. Fourth, timely planing. The early harvest of sweet potato will reduce the rate of flour production, and the harvest of frozen sweet potato will reduce the rate of flour production. Generally, it is appropriate to harvest in the middle of cold frost and frost, and harvesting should be done in different places according to the geographical location. The harvested sweet potatoes should be cleaned and processed in time, and they should not be stacked for long storage time to prevent saccharification and reduce the rate of flour extraction. Do not reprocess the sweet potatoes stored in the pit. Fifth, clean potato chips. Before cleaning, remove diseased potatoes, rotten potatoes, and sand and gravel to prevent mixing in the potatoes and causing mechanical damage. When cleaning, the potato pieces can be washed on the cement platform with water, or the potato pieces can be placed in the non-mud pool and the large cylinder can be cleaned. The mixing of the soil will affect the quality of the starch. Six, grinding refining. 80-90 mesh nylon screen is used, the water supply should be sufficient, the smashed and filtered slag is separated, and the slurry flows into the large pool. Seven, starch separation. The slurry that has flowed into the large pool is precipitated after 6-7 hours of sedimentation and discharged from the water outlet to leave behind the starch. VIII, and then a small sediment deposition. In the large pool, after several times of processing and depositing the accumulated starch, after the fermentation has a small hair powder eye, the machine is replaced with a 100-120 mesh nylon screen. In the small pond, a large pool of 6-7 hours after the precipitation of the slurry is not about to put about 1/3 of the pool capacity, and then the pool of starch from the large pool of water re-comminuted into the pool, precipitation 24-36 hours, After the precipitation, the above drowning water and surface yellow viscous material are released. The rest is pure white starch. If dirt is found in the starch layer in the tank, it must be re-filtered. Nine, timely drying. Koike's starch can be loaded into a powder pocket made of 120-mesh nylon mesh screen 1 meter square, and then hung up, after the parking filter out the slurry into a mortar, dried in time, stored in a bag.