Calcined Bauxite

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Description

GNPGraystar offers Guyanese bauxite. Guyanese bauxite is the most refractory bauxite available in the world due to its higher alumina content and lower alkali and impurit content. Replacing Chinese bauxite with Guyanese bauxite results in a chemistry/performance upgrade in refractory mixes. In mortars and plastics, this bauxite will extend the shelf life over chinese bauxite considerably because it is less reactive in acid and phosphatebonded refractories.


The mineralogy of Guyanese bauxite is alpha alumina and mullite, so there’s no shrinkage or cracking when exposed to hot metal. This product actually has slight expansion at high temperatures versus the shrinkage in Chinese bauxite (containing alpha alumina and glass).


As a ceramic ball-milled product, this may also be used to substitute pricier calcined alumina material in bauxite and mullite mixes.

This material data has been provided by GNPGraystar Specialty Materials.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyValueComment

Bulk density

3.1 - 3.2 g/cm³

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ASTM C357

Loss on Ignition

0.5 %

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max.

Water content

0.12 %

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0.5 %

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Chemical properties

PropertyValueComment

Aluminium

87.5 %

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min. Al₂O₃

Iron

1.75

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max. Fe₂O₃

Silicon

7.5

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max. SiO₂

Titanium

3.5

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max. TiO₂

Technological properties

Property
Other

See picture part of the datasheet for available sizing