Hollow Paddle Dryer for Auminum Hydroxide
Overview of aluminum hydroxide:
Aluminium hydroxide (Aluminium hydroxide), the chemical formula Al(OH)3, is the hydroxide of aluminum. It is a kind of alkali. Because it shows a certain acidity, it can also be called aluminate (H3AlO3). However, when the actual aqueous solution reacts with the alkali, the tetrahydroxyaluminate Al(OH)4- is formed. According to the purpose, it is divided into two kinds of industrial grade and pharmaceutical grade.
Application of aluminum hydroxide:
Aluminum hydroxide is the largest and most widely used inorganic flame retardant additive. As a flame retardant, aluminum hydroxide is not only flame retardant, but also prevents smoke, drips, and toxic gases. Therefore, it has been widely used and its usage is increasing year by year. Scope of application: thermosetting plastics, thermoplastics, synthetic rubber, coatings and building materials industries.
Working principle of hollow paddle dryer for aluminum hydroxide:
Wedge-shaped hollow blades are densely arranged on the hollow shaft, and the heat medium flows through the blades through the hollow shaft. The heat transfer area in the unit effective volume is large, and the temperature of the heating medium ranges from -40°C to 320°C. It can be steam or liquid: such as hot water, heat transfer oil, etc. Indirect conduction heating, no air is carried to take away the heat, and the heat is used to heat the material. The heat loss is only the heat dissipation to the environment through the insulation layer of the body. The wedge-shaped blade heat transfer surface has a self-cleaning function. The relative movement of the material particles and the wedge-shaped surface produces a scrubbing effect, which can wash off the attached material on the wedge-shaped surface, so that a clean heat transfer surface is maintained during operation. The shell of the blade dryer is Ω type, and two to four hollow stirring shafts are generally arranged in the shell. The shell has a sealed end cover and an upper cover to prevent material dust from leaking out and give full play to its effect.
The heat transfer medium flows through the shell jacket and hollow stirring shaft through the rotary joint. The hollow stirring shaft has different internal structures according to the type of heat medium to ensure the best heat transfer effect.
Performance characteristics of special hollow blade dryer for aluminum hydroxide:
◎The blade dryer has low energy consumption: Due to indirect heating, there is no large amount of air to take away the heat. The outer wall of the dryer is equipped with an insulation layer. For the slurry material, only 1.2kg of water vapor is needed to evaporate 1kg of water.
◎The cost of the blade dryer system is low: the unit effective volume has a huge heat transfer surface, which shortens the processing time. The smaller the equipment size, the construction area and construction space are greatly reduced.
◎Wide range of processing materials: Using different heat media, it can process heat-sensitive materials as well as materials that require high-temperature processing. Commonly used media are: steam, heat transfer oil, hot water, cooling water, etc. It can be operated continuously or intermittently, and can be used in many fields.
◎Environmental pollution is small: No air is used, and there is little dust material entrainment. The solvent evaporation of the material is very small, which is easy to handle. For contaminated materials or working conditions that require solvent recovery, a closed loop can be used.
◎Low operating cost: low wear and tear, and low maintenance cost.
◎Stable operation: Due to the special compression, expansion and stirring effect of the wedge-shaped blade, the material particles are fully in contact with the heat transfer surface. In the axial interval, the temperature, humidity, and mixing degree gradient of the material is small, thus ensuring the stability of the process .