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Activated alumina is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 m 2 /g. The compound is used as a desiccant (to keep things dry by adsorbing water from the air) and as a filter of fluoride , arsenic and selenium in ...
Activated alumina; Aerogel; Benzophenone (as anion) Bentonite clay; Calcium chloride; Calcium hydride; Calcium oxide; Calcium sulfate (Drierite) Cobalt(II) chloride; Copper(II) sulfate; Lithium chloride; Lithium bromide; Magnesium chloride hexahydrate; Magnesium sulfate; Magnesium perchlorate; Molecular sieve; Phosphorus pentoxide; Potassium ...
Aluminium hydroxide is a feedstock for the manufacture of other aluminium compounds: calcined aluminas, aluminium sulfate, polyaluminium chloride, aluminium chloride, zeolites, sodium aluminate, activated alumina, and aluminium nitrate. [6]
It is commonly called alumina and may also be called aloxide, aloxite, or alundum in various forms and applications. It occurs naturally in its crystalline polymorphic phase α-Al 2 O 3 as the mineral corundum , varieties of which form the precious gemstones ruby and sapphire .
Most of molecular sieves are aluminosilicates with Si/Al molar ratio less than 2, but there are also examples of activated charcoal and silica gel. [ 2 ] [ 3 ] [ 4 ] The pore diameter of a molecular sieve is measured in ångströms (Å) or nanometres (nm).
Twin Tower, or regenerative desiccant dryers, have two vertical tanks filled with media. The compressed air is passed through a pressure vessel with two "towers" filled with a media such as activated alumina, silica gel, molecular sieve or other desiccant material. This desiccant material attracts the water from the compressed air via adsorption.
Heating the hydroxides leads to formation of corundum. These materials are of central importance to the production of aluminium and are themselves extremely useful. Some mixed oxide phases are also very useful, such as spinel (MgAl 2 O 4), Na-β-alumina (NaAl 11 O 17), and tricalcium aluminate (Ca 3 Al 2 O 6, an important mineral phase in ...
Andalusite, kyanite, and sillimanite are the principal aluminium silicate minerals. [2] [3] [4] The triple point of the three polymorphs is located at a temperature of 500 °C (932 °F) and a pressure of 0.4 GPa (58,000 psi).