This presentation discusses alumina, its manufacturing process, properties, and applications. Alumina, also known as aluminum oxide, is a widely used ceramic material that is the starting point for producing aluminum metal. It is produced through the Bayer process, which refines bauxite ore containing 40-60% alumina. Alumina has high strength, hardness, thermal conductivity, and resistance to acids and bases. It is used as an abrasive, catalyst, purifying agent, and filler in products like plastics, cosmetics, paints, and fibers due to its properties.

1. A PRESENTATION BY,
SAJIMSHA B
R# 14214
M.TECH CIM(S1)
TKMCE
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2.  WHAT IS ALUMINA?
 ALUMINA MANUFACTURING METHOD
 ALUMINA NANOPARTICLE PREPARATION
 PROPERTIES OF ALUMINA
 APPLICATIONS OF ALUMINA
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3.  Widely used cost effective
ceramic material
 White crystalline substance
 Used as the starting material for
the production of Al metal
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4.  Aluminium Oxide
 Aloxide
 Aloxite
 Alundam
 Depending on particular forms of applications
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5. Bayer process
 It is the principal process of refining Bauxite to produce
Alumina.
 Bauxite is the most important ore of Aluminium.
 It contains 40-60 % of Al2O3.
 Rest being the mixture of Silica, iron oxide& other oxides.
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7.  Sol-gel Method
 Emulsion Combustion Method
 Spray pyrolysis Method
 Hydrothermal Method
 Mechanical Milling
 Co-precipitation Method
 Vapour phase reaction & combustion Method
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8.  High Thermal conductivity
 Wear and Corrosion resistant
 High Strength and Stiffness (300 to 630 Mpa)
 Chemical and Thermal stability
 Very good Electrical insulation (1x1014 to 1x1015 Ω
cm)
 Very high compression Strength (2000 to 4000 Mpa)
 High Hardness (15 to 19 GPa)
 Resists Strong Acid & Alkali at elevated temperatures
 Low Density (3.75 to 3.95 g/cm3 )
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9.  Filler
o It is used as a filler for plastics and also a common ingradient
in cosmetics such as Lipstick & Nailpolish
 Catalysis
o Alumina is the Catalyst in the Claus process for converting
hydrogen sulphide waste gases in to elemental sulphur in
refineries. It is also useful for dehydration of alcohols to
alkenes
 Purification
o Alumina is widely used to remove water from gas streams
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10.  Abrasive
oMany types of Sand paper use Alumina crystal. Its low
Specific heat make it widely used in grinding operations
 Paint
oIt is used in paints for reflective decorative effects such as in
the automotive or cosmetic industries
 Composite fiber
oAluminium oxide has been used in a few experimental and
commercial fiber materials for high-performance
applications
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11.  Other
oTransparent aluminium oxide is used in some sodium vapor
lamps
oAluminium oxide is also used in preparation of coating
suspensions in compact fluorescent lamps
oIn chemistry laboratories, aluminium oxide is a medium
for chromatography
oHealth and medical applications include it as a material
in hip replacements
oIt is also used to make spark plug insulators
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