activated alumina, pseudoboehmite, Zibo XiangRun Environment Engineering Co., Ltd.

1. What is fast stripping for activated alumina?

Fast stripping for activated alumina is used for production of raw material of activated alumina(ρ-Al2O3) with fast dehydration method in high temperature.  the production of α- gibbsite dried, crushed, after refinement, into the rapid dehydration step, stay a few in the 600 ~ 900 ℃ high-speed turbulent hot gas forming a ρ-Al2O3 seconds. Its Process is: α-aluminium powder → dry→smash → flash firing (in a hot air oven) → ρ-Al2O3. In flash firing, the material stays a few seconds in the 600 ~ 900 ℃ high-speed turbulent hot gas, then form a ρ-Al2O3.

2. what is the mechanismactivated alumina by using flashing dehydration method?

Through flash dehydration, α-aluminium powder dehydrate after heating, in the same time,  the heat flows quickly from the external, and the internal of particles form vaccum negative pressure, so most of α- aluminium transform into ρ-A12O3 and its conversion rate is 80% or more. ρ-A12O3 is an unstable crystalline. It easily combines with water to release heatand form ahigh intensity boehmite gel. With it, active alumina balls own high crush strength. The ρ-A12O3 after hydration mainly form boehmite and a small amount of amorphous material. X- ray diffraction of activated alumina balls after firing shows that the main crystalline phase is γ-A1203, and also contains small amounts of ρ-A12O3. This is due to a small amount of ρ-A12O3 couldn’t do hydration in fast dehydration materials.