refractories. It is also mixed with other materials such as flake graphite for other,
more difficult applications are envisaged, such as pouring spouts and sliding gate
valves.
Key Properties
Aluminium Oxides key properties
are shown below.
High compression strength
High hardness
Resistant to abrasion
Resistant to chemical attack by a wide range of chemicals even at
elevated temperatures
High thermal conductivity
Resistant to thermal shock
Annual Production
Annual production of aluminum oxide is 45 million tonnes. 90% of this is used in
the manufacture of aluminium metal by electrolysis.
Where Does Alumina Come From?
Most of the aluminium oxide produced commercially is obtained by the calcination
of aluminium hydroxide (frequently termed alumina trihydrate or ATH). The aluminium
hydroxide is virtually all made by the Bayer Process. This involves the digestion of
bauxite in caustic soda and the subsequent precipitation of aluminium hydroxide by
the addition of fine seed crystals of aluminium hydroxide.
Phases
Aluminium oxide exists in many forms, α, χ, η, δ, κ, θ, γ, ρ; these arise
during the heat treatment of aluminium hydroxide or aluminium oxy hydroxide. The
most thermodynamically stable form is α-aluminium oxide.
Commercial Grades
Low Soda
Many applications, particularly in the electrical/electronic areas, require a low
level of soda to be present in the aluminum oxide. A low soda alumina is generally
defined as with a soda content of
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