Calcined Bauxite

Calcined Bauxite Introduction

Calcined Bauxite manufacturers produce Calcined Bauxite by firing (heating) the superior grade Bauxite at high temperature (from 850℃ to 1600℃). This removes moisture thereby increasing the alumina content. Compared to an alumina content of about 57 % to 58 % in raw Bauxite, Calcined Bauxite has an alumina content of 75 % to 90 %. The heating is carried out in rotary kilns. Calcination is done at different temperatures ranging from 850 ℃to 1600 ℃ depending upon the customer’s application.

 

Calcined Bauxite Specifications

Brand

Main chemical composition,%

Density ,(g/cm3)

water absorption,%

Al2O3

Fe2O3

TiO2

CaO+MgO

K2O+Na2O

GLA-90

≥90

≤1.4

≤4.0

≤0.4

≤0.4

≥3.3

≤3

GLA-88

≥88

≤1.5

≤4.0

≤0.4

≤0.4

≥3.25

≤4

GLA-85

≥85

≤1.8

≤4.0

≤0.4

≤0.4

≥3.1

≤4

GLA-80

≥80

≤2.0

≤4.0

≤0.5

≤0.5

≥2.8

≤5

GLA-75

≥75

≤2.0

≤4.0

≤0.5

≤0.5

≥2.7

≤7

Calcined Bauxite Applications

  bauxite grog fines can be made into mold for precision casting.

  1. ’s refractoriness can reach 1780°C.

  It is charactered by good chemical stability and mechanical performance. (Al2O3 ≥48% with low Fe2O3)

  1. °C-2200°C     in the electric arc furnace.After a series of processing, it can become aluminium silicate refractory fiber,

 which can be made into fiber blanket, plate,cloth.

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