Henan Doing Mechanical Equipment Co.,Ltd

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Cassava starch processing technology analysis

Date:Nov 21, 2018/ FAQ/ Chat online

A. Cassava starch processing technology description

(1) Preparation of cassava: Raw materials are the material basis of production, and the quality of raw materials is directly related to the quality of products. After harvesting fresh cassava, the soil, roots, whiskers and wood parts should be removed in time and piled on clean ground to avoid mixing with iron blocks, nails, stones, wood and other debris. It is required to be harvested and processing on the same day, in order to ensure the freshness of the cassava, thereby increasing the starch extraction rate and the quality of the finished cassava starch.

(2) Raw material transportation: The cassava is transported from the dumping yard to the washing machine by using a sweet potato machine and a conveyor, and it is required to ensure the normal supply of the raw materials of the process. In the process of transportation for cassava starch processing technology analysis, it is necessary to prevent the inclusion of iron, nails, stones, wood and other debris. If debris is found, it should be picked up in time.

(3) Cleaning: using a paddle type washing machine, the cassava raw material is rotated and rolled forward along the wall of the cylinder, and water is used as a medium (with a water ratio of 1:4). After cleaning enough fully remove the sand then send cassava to crushing process.

cassava production factoryCassava transporation

(4) Cutting and crushing: The function of crushing is to destroy the structure of cassava for the cassava starch processing technology analysis, so that tiny starch granules can be disintegrated and separated from the roots of cassava. Using a new type of rasping machine, the machine relies on high-speed operation, the cassava is disintegrated, so that the starch granules are continuously separated, and the cassava is processed into a starch slurry by using water as a medium (with a water ratio of 1:1). At present, a secondary disintegration process is generally adopted in order to make the disintegration of the cassava tissue more complete and finer, so that the separation of the starch granules is more thorough, and it is more advantageous to improve the extraction rate. It is required that the starch slurry which has been pulverized once passes through a sieve hole of about 8.0 mm, and the second pulverized starch raw slurry passes through a 1.2-1.4 mm sieve hole.

(5) Stirring: Stirring is an essential part of the process of crushing, sieving, bleaching, sand removal, separation and dehydration. For cassava starch processing technology, its function is: store the original pulp, milk slurry; balance the concentration of the starch milk; adjust the pH value of the starch milk to promote the separation of starch; avoid starch precipitation. However, it is necessary to master the mixing time. If the stirring time is too long, the milk will be acidified and liquefied, and the viscosity and starch recovery rate will be lowered.

cassava crusherRasper machine

(6) Screening: The diluted starch slurry after pulverization and stirring is sieved to separate the starch milk from the fibers. At the same time, the starch milk needs to be further sieved to remove fine slag, fibers, and washed to recover the starch. By sieving in the process of cassava starch processing technology, the purpose of separating and purifying starch is achieved.

At present, centrifugal sieve and fine fiber sieve machine are mainly used, and the two are used together, that is, the fibers are sieved by a centrifugal sieve, and the fine fiber sieve are sieved to remove the fine slag and small fibers. Multiple screening or countercurrent washing processes are commonly employed. It is required to be sieved and washed by the original slurry. The starch residue (dry basis) contains less than 35% starch, wherein the free starch contains less than 5%; the fiber impurity content of the starch milk slurry is less than 0.05%, and the milk slurry concentration reaches 5~6Bé.

(7) Bleaching: Bleaching is an important part of ensuring the quality if use the dried cassava chips for production in the process for cassava starch processing technical analysis. Its role is: adjust the pH value of the starch milk to control the microbial activity and fermentation, accelerate the separation of starch and other impurities; bleach the outer layer of starch granules, so that the produced cassava starch are white. This step is not required if the starch is not processed with cassava chips.

cassava starch making machineDOING centrifuge sieve

(8) Desanding: According to the principle of separation of specific gravity, the starch slurry is pumped into the swimming stream by a pressure pump, the bottom stream is de-sanded, and the top stream is passed through the slurry to achieve the purpose of sand removal. After sand removal, impurities such as fine sand can be removed, and the disc separator can be protected(decrease its working pressure).

(9) Separation: The separation function is to separate insoluble protein and residual soluble protein and other impurities from the starch slurry, thereby achieving the purpose of washing, refining and concentrating the starch milk of the cassava starch processing technology. At present, the disc separator is commonly used for washing, refining and concentrating starch slurry. It is separated according to the principle that the specific gravity of water, starch and yellow pulp protein are different. Generally, two disc separators are used in series, and the first slurry concentration is required to be 5~6Bé, and the slurry concentration is 20-22Bé.

(10) Dehydration: After the separation process, the concentrated starch milk still contains a large amount of water, and thus must be dehydrated to facilitate drying. At present, the peeler centrifuge is used for dehydration of the cassava starch. It is required that the moisture content of the wet starch after dehydration is less than 38%.

cassava starch processing equipmentPeeler centrifuge in Doing factory

(11) Drying: The wet starch dehydrated by the doctor blade is transferred to an air dryer for drying. The steam pressure is controlled at 0.8 MPa. It is required to pass the drying, and the moisture content of the finished starch is about 13.5%.

(12) Packing and warehousing: It is required that the bag is sufficient, the sewing bag is firm, and it is timely put into storage.

B. Process requirements for the cassava starch processing technology analysis:

① The freshness of cassava raw materials must be guaranteed to ensure the quality of starch products and increase the rate of starch extraction.

② The water consumption is large during the cassava starch processing, the processing water is required to reach the drinking standard.

③ Do not use iron equipment and pipes, because cyanide will combine with blue ferrocyanide to color the starch and affect the quality of starch. In addition, the entire production process of starch is basically slightly acidic, therefore, the equipment and pipe fittings used are preferably made of stainless steel.

starch processing plantCassava starch processing plant

④ In the production process of cassava starch processing technology, the amount of material conveyed is large, so more pumps are needed. The various pumps not only serve as a transport, but also require a certain pressure to power the material to achieve separation when the equipment is rotated at a high speed.

⑤ Because starch has easy sedimentation properties, the fiber is uneven material, so the flanges and joints of the pipe elbow should be flanged or live joints, for the easy clean when blocked.

⑥ In order to ensure the quality of cassava starch products, we should pay attention to the frequent cleaning of equipment and sites during the production process to keep them clean and hygienic.

⑦ Because the starch slurry is acidic, all pulp pools (or tanks) should be treated with antiseptic treatment.

⑧ During the drying process, various flammable sources, such as smoking, electric welding, static sparks, etc., should be controlled and eliminated to prevent dust explosion and ensure production safety.

cassava starch making machineHydrocyclone and the parts

C. Cassava starch processing technology process characteristics:

① The production process is combined with a flat process and a vertical process. The floor space is small, the pipeline is used less, the pump is used less, the investment is saved, and the energy consumption is reduced.

② The production process is short, DOING cassava starch processing technology takes only 30 minutes from the feeding of cassava to the production of starch.

③ The production process is continuous and the equipment efficiency is high.

④ In addition to the drying process, the entire production process is carried out under normal temperature and pressure conditions.

⑤ By adopting new technologies for cassava starch processing technology analysis, the production level of the process can be further improved, the equipment capacity can be fully utilized, the number of equipment can be reduced, the energy consumption and production cost can be reduced, the output can be increased, and the product quality can be improved.

cassava starch dryerStarch processing plant flash dryer

D. Main process parameters of Doing Company cassava starch processing technology:

① Cleaning water ratio 1: 4.

② Disintegration water ratio 1: 1.3

③ The primary slurry was passed through a 8.0 mm sieve.

④ Second disintegration of the original slurry through 1.2~1. 4mm mesh.

⑤ By sieving and washing, the cassava residue contains starch (dry basis) below 35%, including free starch less than 5%; the fiber impurity content in the slurry is less than 0.05%; the serum concentration reaches 5~6Bé.

⑥ The first separation slurry concentration is 5~6Bé, and the pulping concentration is 12~15Bé. The second separation slurry concentration is 8~10Bé, and the pulping concentration is 20~22Bé.

⑦ The concentration of the slurry in the feeder centrifuge is 20~22Bé. ​​After dehydration, the moisture content of the wet starch is less than 38%.

⑧ The finished starch has a water content of about 13.5%.

E. Main technical indicators of cassava starch processing:

① Commercial starch recovery rate>96%

② Water consumption <30m3/t starch

③ Coal consumption (standard coal) <0. 1t / t starch

④ Power consumption <180kwh / t starch

⑤ Product quality first-class product rate of 98% or more

To sum up, this is the cassava starch processing technology analysis from Doing Company, as a professional cassava processing machines manufacture and supplier, Doing Company will give you the reliable cassava starch processing technical support. The machines for cassava starch processing Doing Machinery offered main include: dry sieve, paddle washer, cassava cutting machine, rasper, centrifuge sieve, fine fiber sieve, desander, hydrocyclone, disc separator, peeler centrifuge, flash dryer, cassava starch sieving machine, automatic packing machine.

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