I. Preface:

If the cassava starch producer only relies on fresh cassava as raw material for production, the production period is short, the utilization rate of the equipment is low and the fixed cost of the product is high. Guangxi and Southeast Asian countries (such as Vietnam, Thailand, Indonesia, etc.) abound in dried cassava flakes, how to use the advantages of geography and raw materials, the development of new products and new processes to improve the competitiveness of enterprises and economic benefits, should attract our attention and concern. In addition, tapioca starch due to some of its special properties (such as: low viscosity, transparent paste, etc.), in the market has its targeted users and applications, it should not be ignored.

Second, the production process technology:

Dry cassava flakes - → crushed - → collection - → pulp - → impregnation? -→pulp blending-→washing and sieving-→separation and concentration-→bleaching-→dehydration-→airflow drying-→cold air collection -→Screening-→Packaging.

1, raw material crushing and collection:

Dry cassava chips crushing and fresh cassava is different, most companies tend to dry crushing and air collection process, the crushing equipment used in Raymond machine, pulverizer (improved), etc.; collection system mainly consists of extractor fans, cyclone collector (or matching bag duster) and pulp barrels and other components. Dry pulverization than wet pulverization has the advantage of high crushing degree (fine, uniform), is conducive to improving the powder rate; shortcomings of the environment is dusty, energy consumption is slightly higher. Raw material crushing should be noted that: can not be too fine crushing, otherwise the same will affect the subsequent processing and powder rate.

2, impregnation:

Raw pulp needs to be treated by impregnation process before sieving, the purpose of impregnation is to make the starch and fiber fully absorbent, conducive to the separation of sieving, and at the same time in the process of impregnation can be removed part of the sand and mud debris as well as proteins, sugars, fats, inorganic substances and other substances. Impregnation is a very important part of dry potato starch production, its process management directly affects the quality of the product, recovery rate and other TEIs.

If supporting the production of sulfite water device, it is more conducive to the completion of the impregnation process. Related equipment: sulfur furnace, absorption tower, acid water pool.

3, bleaching:

Dry potato starch production and fresh cassava is different, if not by bleaching process, will not be able to make its products "whiteness" to meet the quality requirements; its bleaching mechanism is mainly "redox" reaction; in addition, the bleaching process management requirements are more favorable. In addition, the bleaching process management requirements are higher, need to pay more attention and serious attention.

Main facilities: reaction drum (or pool); process formula: (another article)

4, other:

Dry potato starch other production processes and processes, such as: washing, separation and concentration, dehydration, drying and other fresh cassava, the same or similar, will not be repeated here.

5, dry potato starch production technology features:

The process requirements are strict; difficult to ensure the quality; high processing costs.

Three, the main TEIs

1. Powder rate: per 100 tons of dry chips finished starch. General 60-62%, better ≥ 65%.

2. Tons of product power consumption: the power consumed per ton of finished product. General: 180-200 tons / T, better: & lt; 160 degrees / T.

3. tons of standard coal consumption: the amount of standard coal to be consumed per ton of finished product. General: 0.12-0.15T/T, better: <0.1T/T.

4. Ton of product water consumption: the amount of water consumed per ton of finished product. General: 40-45T/T, better: <35T/T.

5. Potato residue flour content: the percentage of starch content in the absolute dry potato residue. General 28-30%, better <26%.

6. Yellow pulp water containing powder rate: the percentage of starch contained in yellow pulp water. General 0.05-0.1%.

Four, the characteristics and uses of dry flake starch

1. Characteristics: small viscosity, low pasting temperature, short paste filaments, paste transparent, storage resistance.

2. Uses: widely used in food, paper products and modified starch and other industries.

V. Summary

The production of dry flake starch should be combined with the actual situation of the enterprise and the market, choose a reasonable process and equipment, and avoid copying the production mode of fresh tapioca starch, in order to ensure the quality of the product and the economic returns.