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Help CenterContinuous High-efficiency Rotary Flash Dryer for Kaolin Clay, Powerful Manufacturer, Easy to Operate
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Overview of Rotary Flash Dryer Equipment:
The flash dryer (also known as rotary flash dryer or instant dryer) is a high - efficiency, continuous drying equipment specially designed for processing difficult - to - dry materials such as paste, filter cake, and high - viscosity liquids.
The flash dryer ingeniously combines fluidized bed, pneumatic drying, and crushing technologies. Its core working principle is as follows: The wet material is fed into the bottom of the drying chamber, where it meets the high - speed rotating crushing agitator at the bottom and is instantly dispersed and crushed. Meanwhile, the high - temperature hot air rising at high speed (usually 400 - 700°C) is fully mixed with these dispersed tiny wet material particles. The material is suspended, fluidized, and completes the heat and mass transfer process in a very short time (usually a few seconds to dozens of seconds), and the moisture is rapidly evaporated. The dried fine powder enters the cyclone separator and bag filter with the airflow for collection, and the tail gas is discharged.
This mode of "bottom crushing + instantaneous convection of hot air" enables it to effectively solve the drying problems of high - moisture and high - viscosity materials.
Flow Chart of Rotary Flash Dryer System
Application of Rotary Flash Dryer in the Bentonite Drying Process:
Kaolin is an important non - metallic mineral widely used in ceramics, papermaking, coatings, rubber, refractory materials and other fields. After the raw ore undergoes wet processes such as crushing, classification, and flotation, a slurry or filter cake with a moisture content of 30% - 45% is obtained.The purpose of drying is:
Reduce the moisture to the standards required for downstream applications (e.g.,
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Maintain or optimize its physical properties, such as whiteness, particle size distribution, dispersibility, etc.
The rotary flash dryer has excellent adaptability to kaolin drying, and the reasons are as follows:
Efficiently handle wet filter cakes: It can directly and continuously process high-moisture, paste-like kaolin filter cakes coming out of the filter press without pre-drying or granulation, with a simple process.
Instant drying to protect quality: The high-temperature hot air contacts the material for a very short time (in seconds). Although the inlet air temperature is high, the actual temperature of the material is relatively low, which can effectively prevent the crystal structure change of kaolin (such as dehydration phase transformation) due to long-term heating, thus maintaining its whiteness and physical and chemical properties to the greatest extent.
Combined with crushing and grading functions: The high-speed agitator at the bottom can strongly break up the sticky filter cakes; the top classifier can control the fineness of the product and remove coarse particles to meet the particle size requirements of different application fields.
High thermal efficiency and large production capacity: The gas-solid two-phase is mixed violently, with fast heat and mass transfer and low unit energy consumption. It is very suitable for large-scale production of over ten thousand tons.
Compact system and high degree of automation: It is easy to achieve continuous, stable and automated pipeline operations.
Main advantages and features of the flash dryer:
Unique advantages in processing materials
No pre-treatment required: It can directly process highly viscous and high-moisture materials such as paste, filter cakes and slurries, eliminating the cumbersome pre-treatment processes such as dilution and granulation.
"One-step" drying: It integrates drying, crushing and screening. While drying, the material is continuously crushed and graded through the crushing device at the bottom and the high-speed airflow, and finally a uniform fine particle product is obtained.
High efficiency and energy saving
High drying intensity: Since the materials are highly dispersed and have a huge contact area with the high-temperature hot air, the heat and mass transfer rates are extremely fast, and the evaporation capacity per unit volume is large.
High thermal efficiency: The high-temperature gas is in co-current contact with the wet materials. The temperature difference at the inlet is large, the power consumption is relatively low, and the comprehensive thermal efficiency is high.
Good product quality
Controllable temperature, suitable for heat-sensitive materials: Although the inlet air temperature is very high, due to the rapid evaporation of the moisture in the materials, a large amount of heat is taken away, and the residence time is extremely short. The actual temperature of the materials is much lower than the outlet air temperature, which can effectively avoid the overheating and denaturation of the materials and maintain their activity.
Uniform product particle size and good fluidity: By adjusting the speed of the crusher and the air volume, the particle size and moisture of the final product can be controlled.
Convenient operation and control
Continuous automated production: It can realize continuous automated operation from feeding, drying to powder collection, which is suitable for large-scale industrial production.
Negative pressure operation of the system: The entire system operates under a slight negative pressure. Dust is not easy to escape, the working environment is clean, and the safety is high.
Compact structure and relatively easy maintenance
The main body of the equipment is a vertical structure, which occupies a small area.
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The main moving part is the crushing agitator at the bottom. The structure is relatively simple and the maintenance points are concentrated.
Typical application fields of flash dryer:
Inorganic chemical industry:Calcium carbonate, kaolin, silica, aluminum hydroxide, various metal hydroxides, pigments, catalysts, etc.
Organic chemical industry:Dyes, pigment intermediates, pesticides (such as glyphosate), flame retardants, resins, etc.
Minerals and metallurgy: Ceramic raw materials, bentonite, various metal ore powders, sludge, etc.
Food and feed:Starch, soy protein, corn syrup, yeast, distillers' grains, etc. (food-grade configuration and heat source are required).
Technical parameter table of flash dryer:
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