1、 Production process flow of complete starch equipment for cassava processing and production

Cassava selection → Weighing and conveying → Cleaning and conveying → Rotary cage cleaning → Cleaning and conveying → Coarse crushing → Coarse crushing → Pressure curved screen → Fine crushing → Secondary to fifth curved screen → Desander → Curved screen sieving → Rotary filter → Secondary disc separation → Whitening → Rotary filter → Cyclone washing and refining → Dehydration → Airflow dryer → Finished product packaging.

2、 Process flow of cassava flour:

Cassava block conveying → cassava cleaning → peeling machine → cassava crusher → screening, filtering, dehydration → screening → drying machine → fine grinding → high-quality cassava flour packaging.

3、 Operation method (partial process, operation introduction)

1. Selected raw materials:

The quality of starch is closely related to the selection and procurement of raw materials. Cassava that is less than 10 months old has a low flour production rate, while cassava that is over 24 months old has already undergone qualitative changes, making it difficult to crush and grind, resulting in a significant decrease in yield and affecting economic benefits. Therefore, it is necessary to ensure that good raw materials are properly stored in the warehouse.

2. Cleaning and transportation:

The purpose of cleaning is to remove sand, soil, skin, reduce starch ash, and facilitate the next process. Cleaning should be carried out while conveying, so the feeding should be uniform. If there are too many gaps in the rotating cage, cassava cannot roll and cannot achieve the purpose of peeling and cleaning. If it's too little, it won't reach the production capacity. Operators should also pay attention to the water pressure. If the water pressure is too low, it cannot carry away sediment. Generally, the water pressure should not be lower than 0.25Mpa. They should always pay attention to the operation of the cage and conveyor to prevent the accumulation of raw materials during this process. The machine usually needs to be lubricated once every seven days of operation.

Kaifeng Sida Export 60 ton Cassava Starch Complete Equipment Production Line

3. Crushing:

Due to the long length of cassava roots and the lignification near the main stem, it cannot be crushed without crushing. The purpose of crushing is to ensure the normal operation of the crusher. Some factories do not have a crushing process, which increases the load on the crusher and reduces its service life. The second is to fully improve starch production and quality, and increase starch yield.

Pay attention to the temperature of the motor and the sound of the machine during operation. If the sound suddenly decreases, it indicates that there is too much material stored in the crusher. At this time, the feeding amount should be reduced. Add an appropriate amount of return water. If there is too little, do not take away the crushed material. If there is too much, it will cause waste. In addition, it is necessary to control the tightness of the V-belt. If the V-belt is too loose, it will reduce the efficiency of the crusher. If it is too tight, it will increase the load on the motor and damage the motor shaft. Therefore, the operator should concentrate and not leave their post, and strictly follow the operating procedures. The quality of crushing directly affects the output of this shift and the next process. The diameter of the broken block is generally 1cm.

Cassava starch complete set equipment cyclone

4. Crushing:

The crushed cassava (with a diameter of about 1cm) slurry mixture enters the crusher for crushing. Why is it necessary to divide the crushing process into two stages, primary crushing and secondary crushing? One reason is that cassava is too long and contains too much lignified material. If crushed once, the yield of starch cannot meet the requirements. Another reason is that crushing one piece at a time destroys the quality of cassava starch, crushing the large particles of cassava starch into small particles, which cannot fully release the starch and increase the difficulty of filtering starch. So now we divide it into two stages of crushing. The slurry residue after the first stage is then passed through a pressure curve sieve to filter out high-quality starch first. The large residue under the first pressure curve sieve is added with a certain amount of return water to enter the second stage of crushing. The fine residue after the second stage of crushing is then passed through the second pressure curve sieve. Not only does it not damage the quality of starch, but return water is also added during crushing to increase the starch yield by 3-5%.

In the economic accounting of starch factories, water consumption and starch yield are two important indicators. Therefore, in the process of using return water and adding clean water in this stage, it is necessary to master the appropriate amount. There is a certain amount of return water from the curved screen, which should be fully connected with the previous process. The use of water can take away the crushed materials without causing waste. After running the crusher for one hour, touch the upper cover of the crusher bearing with your hand to see if the temperature rises, and then observe if the motor temperature rises. Strictly control the feeding amount. Due to the excessive amount of lignified material, it is difficult to crush. If the machine malfunctions, it should be stopped for cleaning. There is a square mouth above the crusher, which can be manually cleaned first, and then connected to the mouth with a pocket. The machine can be started for cleaning to discharge the lignified crushed material. When cleaning materials, there should be a dedicated person to monitor the start switch to prevent accidents from occurring.

During the operation, pay attention to the amount of material stored in the crusher pit, and promptly start the transfer pump to transport the material to the previous process. From cleaning and conveying to crushing, the entire equipment for crushing is a continuous operation. After crushing, the slurry is sent to the subsequent process by a transfer pump. Therefore, the operators in this section will play a role in connecting the upper and lower parts, which plays an important role in the normal and continuous operation of the entire equipment.

Cassava dried slices, weighed by a belt conveyor slurry, are sent to a cleaning roller cage at a speed of 100 kilograms per minute to remove dust. They are then sent to a hammer mill for two crushes by a screw conveyor. To reduce the flying of dry powder and minimize losses, a induced draft fan is used to send the dry powder into the slurry pool through a separator. The slurry is then pumped into the immersion pool by a mixed flow pump and soaked in hot water at 40 ℃ for 5 hours. After adjusting the concentration, it enters the slurry and slag separation process

5. Separation of pulp and slag:
The slurry separation equipment is a fully stainless steel pressure curved screen, which is a screening device with no vibration, high work efficiency, easy cleaning, and long service life. Five sets of pressure curve screening are used in combination, with one pressure curve screen used to separate the material after primary crushing. The material on the screen is large slag, which is then subjected to secondary crushing, and the slurry is coarse slurry. The second pressure curve sieve is used to separate the material after the second crushing, and the material on the sieve after the second screening directly enters the third pressure curve sieve for subsequent pushing.

The second to fifth sieve is used to clean starch, and each time it is washed with water returned from the later sieve. The second coarse slurry is combined with the first coarse slurry, and after removing fine sand through a sand remover, it enters the sixth sieve for sieving. The water filtered out by the three curved screens is used as return water, which is stored in the return tank and sent to the crusher and crusher for use. After five rounds of screening, the large residue is cleaned thoroughly and used as feed for processing. It can also be dehydrated using a fiber water press and dried for easy storage. If conditions permit, it can be treated as wet feed on-site in factories.

Pressure curve screening relies on a certain pressure to complete the screening, separate the slurry and residue, and achieve the purpose of extracting starch, which plays a certain role in starch yield. So, it is necessary to adjust the nozzle angle on the curved screen. Adjust the feed pressure and control the amount of water added. The required pressure for the sieve is 0.2-0.4Mpa. Operators should always pay attention to the normal operation of the curved screen pump, adjust the valves above the curved screen, pressure load, and prevent material blockage at the pump port. They should cooperate well with the previous crushing section, and clean the screen surface with clean water during shift handover to ensure the smooth operation of the entire set of pressure curved screens.

6. Desanding and Fineness:

The sixth pressure curve sieve is a fine sieve, and the resulting slurry is the finished slurry. The coarse slurry before entering the fine sieve contains sand, which must be removed by a desander. The desander rotates under pressure to throw heavy substances towards the outer wall and settle to the bottom under centrifugal force, while lighter substances (starch slurry) concentrate at the center of the desander after pressure rotation and are discharged from the top to achieve the purpose of desanding. The sand placement time for the lower part is once every 30 minutes. After a first sand removal, 95% of the sand can be removed. After a second sand removal, the sand is basically removed. The working pressure requirement of the sand remover is 0.2-0.3Mpa, but it must be noted that the sand remover is not a mud remover. When the specific gravity of the fine mud in the starch slurry is the same as that of the starch particles, the mud will seep into the starch and be difficult to remove. Therefore, cassava should be cleaned as much as possible before production.

Operators should pay attention to the pressure of the sand remover, and it is required that the pressure of 0.2-0.3 Mpa should not fluctuate for 30 minutes. The sand released also contains some starch, which can be added to a container and precipitated with water to remove a small amount of starch.

7. Rotating filtration:

This process is designed for the normal operation of the disc separator. The disc separator is a precision machinery with a nozzle diameter of 1.2-2.0mm, which is prone to blockage by small particles. A rotating filter is installed at the entrance of the disc separator for inspection. Because unexpected impurities may enter the slurry during production and damage the disc separator if not controlled, the role of the rotary filter is also very important.

8. Secondary separation of disc player

Disc separator is a protein separation device that can separate about 80% of protein at once, and the starch emulsion after secondary separation can achieve a protein content of<0.5%.

Disc separator is a protein separation equipment, which mainly consists of a drum, nozzles, various reflux pipes, and inlet and outlet. There is a set of dozens of stainless steel discs in the drum, with a gap of 0.5-1mm between the discs. There are several tungsten carbide nozzles on the outer edge of the drum. Coarse starch milk is fed into the drum through the upper feed inlet. The high-speed rotating drum rotates with animal materials, generating a large centrifugal force to separate starch and protein with completely different densities in the disc space. The heavier starch particles are thrown towards the inner wall of the drum and output from the bottom flow through the nozzle. The lighter protein moves along the disc with the water flow towards the center and is discharged from the overflow outlet to achieve the purpose of separation. Due to the lower protein content of potatoes compared to grains, they can separate about 80% of the protein in one separation, and two separations can reduce the protein content to less than 0.5%. After separation, adding sulfite water to the turnover tank and adjusting the pH value can improve the whiteness of starch.

9. Cyclone washing and refining:

After whitening, starch milk still contains a small amount of insoluble protein, 0.2-0.3% soluble protein, and other minerals. These residual substances can seriously affect the quality of starch, making its deep processed main products such as syrup, glucose, pharmaceuticals, textiles, etc. unable to meet quality standards.

The cyclone group is composed of eighteen units connected in series, mainly consisting of three working chambers and dozens to hundreds of cyclone tubes and slurry pumps. Starch milk enters from the upper part of the cyclone tube at high speed, and the centrifugal force of high-speed rotation causes solid particles to fall to the bottom with the spiral flow. After being discharged and mixed with the overflow water of the later stage, it enters the lower stage cyclone for secondary sorting. The later stage is added with clean water (using 40 ℃ soft water according to the standard requirements), and its working sequence is that the starch grade goes backwards, and the washing water goes forwards from the later stage, forming a counter current washing to make the product meet the standard.

The protein content is the main indicator for testing the quality of starch. Excessive protein content directly affects the scope of starch use, such as glucose injection. If starch with high protein content is used, it will cause mold growth, white spots, and other phenomena. Therefore, reducing protein content in starch production is a key process.

The production of starch by traditional methods mostly uses the trough method of sedimentation to remove protein, which occupies a large factory area and cannot accurately control the protein content. Therefore, it can only rely on experience, which restricts the production volume and starch quality. The disc separation and cyclone washing process we are currently using completely solves the above problems. After secondary protein separation, a certain amount of whitening substance can be added to allow it to fully react and improve starch whiteness. Enter the cyclone unit and add a certain amount of clean water to separate protein and starch. There is a transfer tank connected between the primary and secondary disc separation and the cyclone unit, forming a continuous operation process.

Disc separator is a high-precision equipment that requires personnel with a certain level of education and training to operate. After each operation, it needs to be cleaned. The specific operating procedures and methods can be found in the "Disc Collector User Manual".

Kaifeng Sida exports a complete set of equipment with a daily output of 60 tons of cassava starch

10. Starch dehydration:
At present, starch dehydration equipment is divided into three categories: the first is the three legged inlet and outlet centrifuge, which has a high degree of labor. The second is the automatic scraper centrifuge, which operates automatically but consumes a lot of electricity and has expensive accessories (around 10000 yuan per year). The third is the vacuum drum dewatering machine currently equipped in our company, which consumes less electricity and is made of all stainless steel equipment. It has a low speed (around 9-12 revolutions per minute) and is easy to operate.

Before using the vacuum drum filtration dewatering machine, the machine should first rotate and then put in starch slurry. When the surface of the filter cloth of the machine absorbs starch with a thickness of 5-6mm, adjust the scraper to scrape off the starch. At the same time, maintain a thickness of 3-4mm of starch on the filter cloth, adjust the feeding speed, and observe the dewatering effect. If the material humidity is too high, the machine speed can be slowed down, and the dehydration effect will be better. Generally, the moisture content of dehydrated wet starch is around 39%, but if the moisture content is high, the difficulty of drying will increase.

It should be noted that the vacuum dewatering filter needs to be operated by professional personnel, and generally should not be disassembled randomly. After the equipment has been running for a period of time, it should be cleaned in a timely manner to prevent acid substances from corroding the filter cloth. Dehydrated starch can be directly fed into a dryer for drying.

The airflow collision dryer uses coal as fuel, and the hot air enters the heat exchanger, turning the clean air entering the heat exchanger at the other end into dry hot air. It is then sent to the drying tower and mixed with wet starch with a moisture content of less than 40%. Within 2-3 seconds, the water is vaporized and discharged through a separator.

The drying tower adopts a two-stage drying method with positive and negative pressure. Wet air is discharged from the first stage, while the second stage discharges air with higher temperature, which enters the feed pipe for reuse. Compared with single-stage drying, it can save energy by 20-40%.

The feed conveyor adopts a continuously variable speed, which can be adjusted according to different climates and materials.

The heating system is equipped with an automatic temperature control device, which can set the temperature of dry and hot air as needed, always maintaining a certain temperature to achieve stable and consistent starch quality.

Layout of cassava processing equipment factory

Processing capacity of cassava starch processing equipment:

Daily processing of starch products: 10 tons, 20 tons, 30 tons, 50 tons, 100 tons, etc

Processing capacity of cassava flour processing equipment:

Daily processing of cassava flour products: 5 tons, 10 tons, 20 tons, 30 tons, 50 tons, 100 tons, etc

Friends who need to know about sweet potato starch processing equipment, potato starch processing equipment, cassava starch processing equipment, kudzu root starch processing equipment, and banana starch processing equipment can contact our technical team,24-hour consultation hotline Manager Zhang (mobile number is WeChat)Manager Zhang

Ready made examples of equipment for Sida cassava starch production line