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Crystal of potassium alum, KAl(SO 4) 2 ·12H 2 O. An alum (/ ˈ æ l ə m /) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula X Al(SO 4) 2 ·12 H 2 O, such that X is a monovalent cation such as potassium or ammonium. [1] By itself, "alum" often refers to potassium alum, with the ...
Aluminium powder is powdered aluminium. This was originally produced by mechanical means using a stamp mill to create flakes. Subsequently, a process of spraying molten aluminium to create a powder of droplets was developed by E. J. Hall in the 1920s.
The compound is the most important member of the generic class of compounds called alums, and is often called simply alum. [5] Potassium alum is commonly used in water purification, leather tanning, dyeing, [6] fireproof textiles, and baking powder as E number E522.
Ammonium aluminium sulfate, also known as ammonium alum or just alum (though there are many different substances also called "alum"), is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH 4)Al(SO 4) 2 ·12H 2 O. It is used in small amounts in a variety of niche applications.
Crystals of alum, the naturally occurring form of which was known back to the ancients.. The history of aluminium was shaped by the usage of its compound alum.The first written record of alum was in the 5th century BCE by Greek historian Herodotus. [2]
Aluminium (British and IUPAC spellings) or aluminum (North American spelling) combines characteristics of pre- and post-transition metals. Since it has few available electrons for metallic bonding, like its heavier group 13 congeners, it has the characteristic physical properties of a post-transition metal, with longer-than-expected interatomic ...
Back in the early 1900's, metal powder was the currency used in the United States of America. Depending on the market, metal powder can be more valuable than gold. The following are the types and uses of metal powder: [7] Aluminum powder: Fireworks, metallic paints, manufacturing in solar cells in the green energy sector
Aluminium granules have been found safer and economical compared to atomized aluminium powder. Aluminium granules have lower explosion risk in production and in use of the product itself. Aluminium granules have lower explosion risk in production and in use of the product itself.
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