Aluminum Hydroxide Grinding and Classification

Description：usage of aluminum hydroxide as a flame retardant has many unique advantages such as high availability, cheap, wide range of applications and many varieties. In addition, aluminum hydroxide boasts environmental safety as a safe, non-toxic, pollution-free inorganic flame retardant material; therefore, it is becoming one of the most commonly used flame retardant products. The thermal decomposition of aluminum hydroxide to produce aluminum oxide releases a lot of water vapor through the following reaction: 2Al(OH)₃ → Al₂O₃ + 3H₂O

 

The thermal decomposition reaction of the aluminum hydroxide is a strong endothermic reaction, requiring heat absorption up to 1,967.2J/ g, playing an important role in cooling the polymer. The water vapor generated by the reaction may dilute the polymerization of combustible gases, inhibiting the efficiency of combustion. The newly generated Alumina also has high absorbance of the soot particles to suppress smoke. After dehydration of aluminum hydroxide, the metal oxide produced is a high fire resistant surface good uniform distribution, with carbide being formed together with other flame gases to form a dense barrier, isolating oxygen to reduce the burning rate, thereby reducing the decomposition of the product, preventing the spread of flame. In addition, aluminum hydroxide also has low resistance drop, promoting carbonation, having a long-term retention in the polymer and increases its arc resistance.

 

Activated aluminum hydroxide：aluminum hydroxide as an inorganic flame retardant, while having more excellent flame retardant effect, the surface area needs to be increased by 50% or more to fully display the flame-retardant effects. In the production of flame-retardant cables, filling amount of aluminum hydroxide and even up to 120% to 200%, the high loadings will affect the compatibility and mechanical properties of polymers and inorganic fillers due to a difference in their physical and chemical structure as inorganic filler and an organic polymer. With an affinity difference, if the hydroxide is directly filled, an uneven dispersion will result, and the larger particles will experience a larger amount of stress causing the material to become the weak link limiting the amount of filler added in the polymer and also seriously affects the performance of the product. As the aluminum hydroxide are prone to defects during the adding phase, an increasing number of individuals and research institutions are using modified aluminum hydroxide (activation) and have achieved good results.

 

Common Size Reduction Processes for Battery Materials：FQW / FWL series jet mill, FFW / FFL series air classifier, FJW / FJL series ultrafine mill, FSL Series cryogenic grinding equipment.

 

Ultrafine grinding: for common grinding applications, high yield, low energy consumption.

Jet Milling: high value-added ultrafine grinding applicable.

Low temperature / cryogenic grinding: for more temperature sensitive applications and grinding applications with high environmental requirements.

        

            FQ Series air mills               FSL series ultra low temperature grinding production line           FJ series pulverizer