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Concept and method of drying in laboratory spray dryer
2018/9/6 17:29:53
Spray drying is an indispensable part of human beings. Drying is one of the oldest unit operations with high energy consumption. According to statistics, up to 12% of industrial energy consumption is used for drying in developed countries. In China, drying accounts for 10% of total industrial energy consumption. In a narrow sense, drying refers to the process of heating and evaporation of water (or liquid), because it directly affects product quality and production costs, so the correct selection and use of drying operation is one of the important means to maintain product quality.Laboratory spray dryerThe types and specifications are very complicated, and the operation methods are different. With the rapid development of China's national economy and the continuous progress of science and technology, drying technology is playing an increasingly important role in the national economy, and its application is expanding, such as grain, fuel, minerals, fertilizers, wood, medicines, food, grass, paper, rubber, building materials, electrical products, ceramic blanks. Body, fabric, synthetic chemicals, insulating materials, etc. For drying, there are large quantities of materials with an annual output of tens of millions of tons, and valuable materials with an annual output of only tens of kilograms. The specifications of dried materials are from nanomaterials to large equipment such as machine tools, cars, agricultural machinery and so on.
1.1.1 is characterized by the following properties of dry materials.
(1) solution and slurry materials, such as salt solution and ceramic mud.

2. Sol and gel materials, such as titanium dioxide colloid, silica gel, etc.

3. Freezing materials such as biological materials, food, pharmaceutical products, etc.

(4) paste materials, such as activated sludge, filter cake, filter brick and abrasive filter.

Powder and granular materials, such as titanium dioxide powder, ceramsite, ceramic raw material, ceramic powder, etc.

_Block materials, such as wall and floor tiles, brick body, domestic ceramic body, electrical porcelain insulation body, electronic ceramic device body and so on.

Bar materials, such as ceramic rods for ceramic ball mills, roller rollers, magnetic rods for magnetic ceramics, etc.

Short, fibrous materials, such as ceramic cotton, asbestos, carbon fiber, glass fiber, etc.

Irregular shapes of materials, such as sanitary ceramics, art ceramic bodies, etc.

_Continuous sheet material, such as ceramic sheet prepared by tape casting, ceramic sheet rolled by film rolling mill, etc.

Porous materials, such as porous ceramics, honeycomb ceramics, foamed ceramic bodies, etc.

Coating of parts and equipment, such as coating of mechanical products, paint film, etc. Physicochemical properties of 1.1.2 materialsThe physicochemical properties of the dried materials determine the types of drying media and must have a better understanding of the physicochemical properties of the materials.Products such as reaction products. Chemical properties of national materials. Such as spring, flammability, redox, alkalinity, corrosiveness and water absorption.Physical properties of materials. Such as thermosensitive (softening point, melting point, Buddha point, decomposition point), false hide, straight skin, ratio drying method andLaboratory spray drying equipmentImportant factors.



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