Activated alumina (Al2O3) is an aluminum hydroxide material which is dehydroxylated at high temperatures to remove water molecules, creating a consistent and well-defined pore structure that resists attrition in drinking water supplies.
Preparation Method of the Invention: Take 350kg of pseudo-boehmite and 8 tons of pure water and place into an hydration reaction groove for two hours at 80 degrees before stirring at 145 rev/mins speed for two more hours to produce general active oxidation aluminium powder product with specific surface area >=450m2/g, pore volume 0.40.6ml/g pore volume, specific surface area >=450m2/g and specific igloss concentration between 30-33% with Na 2O =0.1% and gibbsite=3%. Its physical-chemical parameters include specific Surface Area >=450m2/g while specific Surface Area=450m2/g with Gibbsite Content=3% and all these parameters can be measured from these parameters to produce general active oxidation aluminium powder product with general active oxidation aluminium powder product. Its physical-chemical parameters being: specific Surface Area >=450m2/g while specific Pore volume of 0.40.6ml/g which produced general active oxidation aluminium powder product which had its properties. These parameters included specific Surface Area>450m2/g while Pore Volume of 0.400.6ml/g Pore Volume 0.400.6ml/g Pore Volume 0.40 6ml/g while Na 2O=0.1% while Gibbsite content being 3.
Characteristics
Activated alumina, an aluminium oxide compound with many industrial applications, is an efficient adsorbent which traps gases and liquid molecules efficiently. As such, it has multiple uses, from drying gases to purging fluid streams of contaminants; catalyst carriers (it has high catalytic activity); to porous structures. Thanks to these properties, activated alumina makes an invaluable material.
In order to produce activated alumina, it requires low-temperature dehydration at specific low temperatures. This process enables it to retain its adsorption capacity even at higher temperatures – this is critical since temperature impacts its properties significantly.
Dehydration releases water molecules from alumina and forms an ordered porous structure with precise pores that can bind with volatile gases like those released during combustion, similar to how sponge absorbs these same molecules but has much higher surface area.
Preparing Active Oxidation Aluminium Powder involves using filter cake of slaking, drying it at 300 environment for approximately 1020 seconds before placing filler bin and packaging at 4050 when it has cooled off. Its physical-chemical parameters include specific surface area >= 400m2/g; pore volume 0.350.55ml/g; specific surface area is over 400m2/g, specific pore volume 0.350.55ml/g, Igloss = 30 percent and Na2O content below 0.1% with gibbsite contents >=4%.
Applications
Activated alumina is used as an adsorbent in gas dehydration, with its effectiveness dependent on how it’s treated with heat. Activated alumina is generally prepared by thermal decomposition of hydrated forms of alumina such as crystalline hydroxide, oxide-hydroxide or hydrous alumina gel; then activated via water bonding until its loss on ignition falls between 4-7 percent before activation is furthered using an agglomerator, pin mixer or disc pelletizer.
This process creates a porous material with a large internal surface area that can be utilized for various applications, including the removal of contaminants such as phosphate, fluoride and arsenic in fixed bed mode. Regeneration using dilute NaOH or sulfuric acid also makes this an economical method of removal of contaminants.
General, the type and conditions of calcination and activation determine alumina’s pore structure and surface area, which in turn determines its adsorption properties for gases. Alumina with pores measuring 10-20 microns are particularly effective at absorbing hydrocarbons and other volatile organic compounds while 50-80 micron pore sizes may not. Alumina’s pore sizes can also be altered through various temperature and time adjustments during calcination and activation processes to optimize performance.
Properties
Activated alumina has the capability of absorbing moisture in both air and liquid environments. Its moisture absorption capacity surpasses that of silica gel and it can be used when high humidity levels are required, yet is resistant to attrition; keeping its capacity intact even under high temperatures.
Alumina activated with carbon is used as a desiccant because its polar surface attracts and adheres to water molecules, trapping them within. However, the process is reversible, as heating it releases any trapped moisture molecules back into solution.
One of the primary uses for activated alumina is as a drying agent for gases and liquids. Due to its strong affinity for water molecules, activated alumina effectively absorbs humidity levels in ambient air, thus decreasing humidity levels – an attractive feature which makes activated alumina an excellent choice for industrial processes and compressed air systems.
Activated alumina is produced through controlled heating of hydrated alumina, leading to the expulsion of water molecules through pores in its crystal lattice and thus creating highly porous materials with average pore diameters of 4 nanometers and total surface areas exceeding 350,000 m2/kg. Adsorption capacity depends upon pH value ranging between 5.5-6.5 for optimal results.
Cost
Activated alumina is a form of aluminium oxide with an extremely porous structure, boasting hundreds of square meters per gram in internal surface area and the capacity to absorb gases and liquid molecules. As such, activated alumina is commonly used as an adsorbent, catalyst carrier, and desiccant.
Adsorption applications make full use of this material’s low density and large surface area, along with its corrosion resistance, making it suitable for high temperature operations and gas streams. Adsorption also can help trap heavy metals like arsenic, fluoride and sulfur from being released in gas streams.
Costing of activated aluminium oxide depends on its size, purity and particle size. Larger particles usually cost more than their smaller counterparts. To determine its cost accurately, speak to local suppliers about activated alumina products.
Activated alumina is created from natural bauxite, which contains aluminium and iron oxides, that is purified using acid or alkali methods, with impurities like silica and iron oxide being removed during this process. Subsequently, it is ground into powder before being mixed with water to form paste that will eventually be put in a rotary kiln to be heated and reformed until finally creating finely ground porous alumina with an average particle size of 20 nanometers which can then be used as an adsorbent for fluoride removal as well as drying and hydrogen peroxide production.