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Chemical specification for refractory bauxite 85

Calcined Bauxite is produced by sintering high-alumina bauxite in rotary, round or shaft kilns at high temperatures of 1600-1800. This process of calcining (heating) bauxite in kilns removes moisture and gives Calcined Bauxite its high alumina content and refractoriness, low iron, and grain hardness and toughness. Its thermal stability, high mechanical strength and resistance to molten slags make Calcined Bauxite an ideal raw material in the production of shaped and unshaped refractories for the steel industry, foundries, glass and cement plants.

Item

RKB90

RKB88

RKB87

RKB85

RKB80

RKB75

Al2O3(%)

90.0min

88.0min

87.0min

85.0min

80.0min

75min

SiO2(%)

3.5max

5.5max

7.0max

8.0max

10.0max

16max

Fe2O3(%)

1.5max

1.6max

1.8max

2.0max

2.0max

2.0max

TiO2(%)

3.8max

4.0max

4.0max

4.0max

4.0max

4.0max

CaO+MgO

0.35max

0.40max

0.40max

0.40max

0.50max

0.50max

K2O+Na2O

0.35max

0.40max

0.40max

0.40max

0.50max

0.50 max

B.D(gm/cc)

3.35min

3.25min

3.20min

3.10min

2.90min

2.80 min

Moisture

0.3max

0.3max

0.3max

0.3max

0.5max

0.5max

Available Size

Bauxite aggregate:(0-0.3mm,0-0.5mm,0-1mm,1-3mm,3-5mm,5-8mm.)

Bauxite powder:(100#-0,200#-0,325#-0)

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