At 33% capacity utilisation, the flour milling industry requires about 200,000mt of cassava flour per annum. This will require 200 plants of about 1000t capacity per year. This is a business opportunity for investors and agro processors. A 1000t per annum output plant is considered a small-scale plant. There are also higher capacity plants especially flash dryers that can be imported from Brazil and other countries. Nothing stops investors with means to put up large-scale plants (of 2000 to 10,000t/day). But there are obvious supply chain problems for very large-scale HQCF plants. For equity reasons small-scale plants of 1000t per annum may be more appropriate. There is local capacity for the development of small-scale plants in Nigeria using locally fabricated machinery. Machinery can also be imported. High quality cassava flour can also be produced at the micro level (i.e. 100t/year output). Following is the introduction of cassava flour processing.
Step 1: Harvesting
Harvest matured cassava from the farm and load it to the processing shed immediately. If the quantity of cassava harvested can not be carried in the same day for logistic reasons do not detach the cassava from the stem and leaf until the vehicle to carry it is ready. That is to say, fermentation will not occur if the cassava is still attached to the leaf and stem even if it has been uprooted. But care must be taken not to bruise the cassava when uprooting it.
Step 2: Washing and peeling cassava
Our cassava peeler could handling large capacity of cassava and well cleaning. This cassava peeler machine is with stable operation and easy maintenance etc. 1. peeling 2. washing 3. do not hurt the material 4. material to the next stage automatically.
Step 3: Grinded and rasping
The tuber is grinded and become low broken percentage . That means 50% cassava flour is not separated and combined with fiber. In the rasping process, should add process water to dilute slurry. the potato slurry in the collection trough is pumped in to desanding cyclone. Don't make the cassava flour dissociate and make the cassava flour combine with fiber. So the special design of rasper is vital for flour fineness and freeness.
Step 4: Desanding
In the desanding process, sands and sawtooth etc coarse particle will be removed from cassava slurry. This unit is made of ceramic cyclongnetts, sands collection tank, automatic desanding valve and back flush device. back flush avoid cassava flour loss in desanding process. Desanded slurry is sent to dewatering unit.
Step 5: Dewatering
Because there is hydrocyanic acid toxic substance in cassava peels. In this unit, we use filter presser to dewatering and detoxification process.
When slurry reaches to certain liquid position in slurry tank, start to dewater by filter presser. Then transport the material to cassava flour drying procedure by belt conveyor.
Step 6: Drying
Dewatered cassava flour cake contains high moisture to 45~50%, which can’t enter into flash dryer directly and will be mixed with dry flour and reduce the moisture to 38%, then transported to feeding port of flash dryer by conveyer belt, pass through feeder and enter into raiser. The heat source of flash dryer is steam heat exchanger. Wet cassava flour is heated by hot wind and water is steamed. After drying, cassava flour and air are separated in cyclone separator. At the bottom of cyclone separator, it is closed by air closer. after wet air leave cyclone separator , which is discharged in to atmosphere. Collected cassava flour is transported to vibration sieve unit; the coarse particulate matter is sieved out. The sieved cassava flour is transported to hopper for storing and cooling.
Step 7: Automatic Packing
1. Automatic weighing and calculating 2. Large adjustable weighing scope from 5-50kg 3. Hand seal, Packing cassava flour in different bags.
Henan Doing Mechanical Equipment Co., Ltd
Contact: Ms Judy Qian
Mobile Phone: +86 15515538695
ADD：Room No.3, 4th floor,Building18 , Area A, Yingxie Garden,Jinshui District,Zhengzhou,Henan,China.