For processing white starch with sweet potato, it is necessary to use a sweet potato variety with high starch content. The specific method is as follows:
First, choose Sweet potato variety with high starch rate
There are many varieties of sweet potato, and starch type should be selected for starch. According to my local processing practice, it is better to choose the excellent starchy varieties of “Red Selection No.1â€, “One Nest Redâ€, “Shengli No.1â€, “Meiying No.1†and “868â€. These varieties are grown on sandy soil, hillsides, hills, or low-lying clay, and the flour extraction rate is generally around 18%-25%.
Second, choose advanced processing machinery
At present, there are various types of potato processing machinery on the market. Depending on the size of the processing and the amount of processing, choose a potato refining separator, a slag separator, which has good mechanical properties, high degree of automation, high starch yield, durability, suitability, simple operation and convenient use. The cymbal automatic cross-machine, the slanting roller automatic sling machine and other machinery.
Third, the production of starch sedimentation tank
Depending on the size and quantity of the processing, it can be smeared with cement, or brickwork (with plastic sheeting inside). It is made into a large pool of starch slurry for one machine, one pool or one machine, or a starch precipitation small pool for specializing starch. Leave the drain at the end of the pool.
Fourth, timely harvest
When the sweet potato is harvested early, the starch rate will be lowered, and the freezing of the potato body will also reduce the starch rate. Generally, it is appropriate to harvest in the middle of the cold dew to the frost, and all localities should be harvested according to the geographical location and climatic conditions. Harvested sweet potatoes should be cleaned and processed in time, and should not be stored for too long, in order to prevent saccharification and reduce the starch rate. Do not reprocess the sweet potato stored in the lower jaw.
Five, clean potato chips
Before cleaning, the diseased potatoes, rotten potatoes and sandstones should be removed to prevent mechanical damage caused by mixing in the potatoes. When cleaning, the potato chips can be washed on the cement platform with water, or the potato chips can be put into the cement pool and the large tank for cleaning. Soil mixing can affect the quality of the starch.
Six, crushing and refining
A nylon mesh of 80-90 mesh is used. The water supply should be sufficient, and after the pulverized and filtered pulp is separated, the slurry flows into the large pool for precipitation.
Seven, starch separation
After the slurry has flowed into the large pool, after 6-7 hours of natural precipitation, the above water is discharged from the water discharge port to leave the starch.
Eight, again fine pool precipitation
After several times of processing, the accumulated starch was deposited in the large pool. After the small hair powder was found, the machine was replaced with a nylon mesh of 100-120 mesh. In the small pool, the water in the large pool after 6-7 hours of sedimentation of the slurry is placed, about 1/3 of the volume of the small pool, and the starch added from the large pool is mechanically re-pulverized into the small pool and precipitated for 24-36 hours. After the precipitation, the above water and the yellow sticky substance are discharged, and the rest is pure white starch. If you find that the bottom of the starch in the small pool has soil, you can use a blade to shovel and re-filter.
Nine, dry at the right time
The starch of the small pool can be placed in a powder pocket made of 120 mesh nylon mesh 1 meter square, and then hung up. After the filter is filtered out, the slurry is smashed, dried in time, and stored in a bag.
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