The process for preparation of active aluminum hydroxyoxide via flash calcination of gibbsite in a new energy-efficient centrifugal drum-type reactor

• Main Authors: Vladimir Danilevich, Lyubov Isupova, Valentin Parmon
• Format: Article
• Language: English
• Published: Elsevier 2021-07-01
• Series: Cleaner Engineering and Technology
• Subjects: Gibbsite; Active alumina; Active aluminum hydroxyoxide; Flash calcination; CTA-Process; TSEFLAR
• Online Access: http://www.sciencedirect.com/science/article/pii/S2666790821000781

A process for the preparation active aluminum hydroxyoxide using flash calcination (no longer than 3 s) of gibbsite in a new energy-effective centrifugal drum-type reactor TSEFLAR is considered. The influence of the process parameters on properties of the target product is determined. The temperature and residence time of the particles on the rotating drum surface is established to produce the active aluminum hydroxyoxide of the composition Al2O3·(3-z)H2O (where z = 2.5–2.8) with high chemical activity (solubility in the sodium hydroxide solution) and the specific surface area larger than 200 m2/g is characteristic of the product.Models of particle motion along the reactor surface and of their heat states are suggested to establish the process parameters determining the product properties, such as the residence time of the particles on the surface, particle temperature, and residual water content.The energy consumption for the gibbsite activation in the drum-type reactor is as low as one third of that of the currently used industrial technology based on thermal treatment of gibbsite in flowing flue gases.