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Propeller blade-micropowder composite drying method for nanometer grade material

A combined drying and paddle dryer technology, applied in dryer combination, drying, dryer and other directions, can solve problems affecting technical and economic performance and promotion scope, wide product particle size distribution, uncontrollable particle agglomeration degree, etc. problems, to achieve the effect of solving the degree of agglomeration of micropowder, low operating costs, and preventing thermal denaturation

Inactive Publication Date: 2004-08-04
LANZHOU RUIDE DRYING TECH
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Problems solved by technology

It can be seen from known technologies that the existing drying technology in the industrial preparation of inorganic nano-materials is only the application of conventional drying technology, and the commonly used drying technology has spin flash drying or a combined drying method of belt drying and spin flash drying. The problems are: 1. the degree of agglomeration of the particles cannot be controlled, and the product particle size distribution range is very wide; 2. the drying is uneven; Compared with the drying process, the energy consumption is large and the cost is high. These factors have affected the technical and economic performance of the product and the scope of promotion.

Method used

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  • Propeller blade-micropowder composite drying method for nanometer grade material
  • Propeller blade-micropowder composite drying method for nanometer grade material

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Embodiment Construction

[0018] The present invention will be described in further detail in conjunction with accompanying drawing:

[0019] Nano wet materials are continuously and evenly fed into the first-stage paddle dryer 1, using steam as the heat medium, and the temperature is controlled at 150°C for pre-drying. The moisture content of the pre-drying product is controlled at 10-15%. The moisture control of the primary drying product is to control the residence time of the material in the dryer by adjusting the height of the overflow plate at the material outlet of the paddle dryer. The moisture evaporated during the primary pre-drying process enters the primary drying dust collector 9. The function of the dust collector 9 is to separate the moisture discharged from the primary paddle dryer 1 from the dust entrained in it. After passing through the primary drying dust collector 9, The moisture is evacuated and the recovered material is returned to the dryer. The dust collector can be a bag filte...

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Abstract

A method for drying the nano-class material features the combination of paddle-type drier with microparticle drier. Said paddle-type drier is used for pre-drying at temp lower than 150 deg.C to remove the most of moisture. Said microparticle driver is used for drying, pulverizing, classifying and pneumatic delivering. Its advantages are high granularity uniformity and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of drying inorganic nano-scale materials, such as the drying of nano-scale calcium carbonate, nano-scale aluminum hydroxide, magnesium hydroxide and the like. Background technique [0002] Nanoparticles have a strong surface binding ability. When the nanomaterial is in a wet state, this strong surface binding force makes the material extremely viscous, resulting in agglomeration of the material, poor fluidity, and difficulty in conveying, thus affecting the drying process of the material. It brings certain difficulties. When the nanomaterial is in a dry state, it is this binding force that makes the nanoparticle not exist as a single particle, but as countless particles exist in the form of agglomeration. The agglomeration of particles has a great influence on product performance, so it is very critical to control the degree of agglomeration of particles during the drying process of nanomaterials. To reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B20/00
Inventor 孙中心张毅赵旭王毅韩志宏
Owner LANZHOU RUIDE DRYING TECH
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