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How to process white sweet potato starch
To process refined white starch with sweet potato, sweet potato varieties with high starch content must be used. The specific methods are as follows: 1. Select the sweet potato varieties with high starch rate. There are many types of sweet potato, and the starch type should be selected for making starch. According to my local processing practices, it is better to choose "Lu Xuan No. 1", "a nest of red", "Victory No. 100", "Meiying No. 1", "868" and Other red-skinned starch-type fine varieties. These varieties are grown on sandy soil, hillsides, hills, and low-lying clays. The extraction rate is generally around 18%-25%. Second, choose advanced processing machinery: At present, there are many different types of potato processing machinery on the market. According to the size of the processing and the amount of processing, the potato refiner, slag separator, which has good mechanical properties, high degree of automation, high starch yield, robustness, strong applicability, simple operation, and convenient use, are selected. Throwing pieces automatically over the machine, the bending roller automatically over the machine and other machinery. Third, the production of starch sedimentation tank: depending on the size of the processing size, the number of available cement can be used to make, but also available brick (inside covered with plastic sheeting). It can be used to make a starch pool with a machine or a pool or a pool, or a starch sedimentation tank for refining starch. Leave the outlet on the pool side. Fourth, timely harvest: early harvest of sweet potatoes will reduce the rate of starch, late harvest of frozen body damage will reduce the starch rate. Generally, it is appropriate to harvest in the middle of cold frost and frost, and the harvest should be harvested in different places according to the geographical location and climate conditions. The harvested sweet potatoes should be cleaned and processed in time, and not stored for a long time to prevent saccharification to reduce the starch rate. Do not reprocess the sweet potato stored in the pit. 5. Cleaning the potato block: Before cleaning, remove the diseased potato, rotten potato and sandstone debris to prevent the mechanical damage caused by mixing in the potato. When cleaning, the potato pieces can be washed on the cement platform with water, and the potato pieces can also be cleaned in the cement pool and the large cylinder. Soil mixing affects starch quality. 6. Crushing and refining: 80-90 mesh nylon screen is used. The water supply should be sufficient. After the smashed and filtered slag is separated, the slurry flows into the large pool and precipitates. VII. Starch separation: The slurry that flows into the big pool, after 6-7 hours of natural precipitation, will release the above drowning water from the water outlet, leaving starch. VIII. Sedimentation of small ponds: In the large pool, after several times of sedimentation and storage of starch, a small hair powder eye was found and the machine was replaced with a 100-120 mesh nylon screen. In the small pond, drowning water within 6-7 hours after being deposited in a large pond, about 1/3 of the volume of the small pond, and then adding the starch from the large pool to the water and re-grinding into the pool, precipitate for 24-36 hours. After the precipitation, the above drowning water and surface yellow viscous material are released. The rest is pure white starch. If there is dirt in the bottom layer of the starch in the tank, use a spatula to scoop it out and re-filter it. 9, timely drying: Koike starch can be loaded with 120 mesh nylon mesh 1 meter square made of powder inside, and then hanging up. After parking, the slurry is filtered out, dried in time and stored in bags.