Zibo XiangRun Environment Engineering Co., Ltd.The property of activated alumina powder is an important branch of the non-metallurgical alumina industry that has developed in recent decades. It refers to transition phase aluminas such as γ, κ, θ, η, δ, and χ; and alumina compounds containing part of water ( Molecular formula A12O3.nH2O, 0≤n<1), these aluminas have some common characteristics: large specific surface area, multiple pore structures, and reasonable pore size distribution. Based on the above characteristics, activated alumina is used in medicine, chemical industry, and metallurgy. , Water purification, chemical analysis, exhaust gas treatment and other fields as adsorbents, catalysts, catalyst carriers, etc., are increasingly concerned by people from all walks of life, and with the advancement of science and technology, it will play a greater role.
2. Classification of activated alumina powder
2.1 γ series low temperature alumina
Its molecular formula can be represented by the general formula Al2O3•nH2O, where 0<n<0.6, this form is generated at a dehydration temperature not exceeding 600℃, including ρ-, χ-, η-, γ-alumina, and crystallization conditions. it is good.
2. 2δ series high temperature alumina
This type of alumina is basically a natural product called molecular agent at 800°C to 1000°C, including k-, θ-δ-alumina, etc., which are relatively crystalline.
2.3. ρ-alumina
This activated alumina is an amorphous body, which is formed by rapid heating and dehydration of gibbsite. It has a very important characteristic: rehydration
ρ- Al2O3 +6H2O Al2O3.H2O Al2O3.3H2O
According to its hydration characteristics, many different types of activated alumina products can be prepared, such as rods, balls, etc.
3. Preparation and properties of activated alumina powder
3.1 Preparation of activated alumina powder
Activated alumina powder is prepared by mixing aluminum hydroxide, pseudo-boehmite and other aluminum oxide water with different additives and controlling different calcination conditions.
3.2 Characteristics of activated alumina powder
The specific surface area is large, generally up to 350m2/g or more. The purity of the product can be controlled by the method of controlling the purity of the raw material, and the pore size distribution of the product can be controlled by the method of additives.
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