Stonebase Refractory can provide its global customers with high quality refractory and ceramics raw material,
these raw material include Calcined Kaolin, Calcined Bauxite, Mullite, Cordierite, Brown Fused Alumina,
White Fused Alumina, Tabular Alumina, Spinel,SiC,Flake Graphite, etc. the following is their specification.
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 |
 |
 |
 |
| Calcined Bauxite |
Calcined Bauxite |
Brown Fused Alumina |
Flake Graphite |
|
 |
 |
 |
 |
| Cordierite |
Black SiC |
Tabular Alumina |
White Fused Alumina |
|
Calcined Kaolin: Calcined Kaolin is an anhydrous aluminium silicate produced by heating ultrafine natural kaolin to high temperatures in a kiln.
The calcination process increases whiteness and hardness, improves electrical properties, and alters the size and shape of the kaolin particles.
|
| Type |
CK40 |
CK42 |
CK45 |
| Al2 O3 (min) |
40 |
42 |
45 |
| Fe2 O3 (Max) |
0.6 |
0.5 |
0.5 |
| B. D g/cm3 |
2.40 |
2.45 |
2.45 |
|
Calcined Bauxite: Chinese bauxite has higher
Al2 O3
and low impurities. Selected bauxite was calcined in shaft, round, rotary kiln at high temp.,
the Al2 O3
transfers to alpha Al2 O3
and form corundum phase, further crushed, grinded and sieved to obtain an ideal aggregate for refractory application.
|
| Type |
Rotary Kiln Bauxite |
Round Kiln Bauxite |
Shaft Kiln Bauxite |
| Chemical Properties |
Al2 O3 |
85-88 |
90 |
85-89 |
90 |
80-86 |
| Fe2 O3 |
2 |
1.5 |
2 |
1.5 |
2 |
| Physical Properties |
B.D g/cm3 |
3.15-3.25 |
3.4 |
3.15-3.3 |
3.4 |
2.8-3.1 |
|
Mullite (2SiO2
3Al2 O3 ):
Its structure gives it an excellent "creep" resistance and high temperature resistance. Mullite widely used in producing of
kiln furniture, investment casting, refractory bricks and other shaped refractory.
|
| Type |
Chemical Composition % |
Bulk Density g/cm3 |
Apparent Porosity % |
C.T.E20-1200℃ 10-6 K-1 |
Phase Composition % |
| Al2 O3 |
SiO2 |
Mullite |
Glass |
| Mullite 47 |
48-52 |
49-45 |
≥2.50 |
<4.0 |
4.4 |
65 |
30 |
| Mullite 60 |
60-75 |
37-32 |
≥2.65 |
<3.0 |
- |
80 |
Trace |
| Mullite 70 |
70-73 |
26-23 |
≥2.80 |
<3.0 |
- |
90 |
Trace |
|
Cordierite (5SiO2
2Al2 O3 2MgO):
Its low thermal expansion gives it an excellent thermal shock resistence.
Cordierite widely used in Producing kiln furniture, honeycomb ceramics, and so on.
|
| Raw Material |
Chemical Composition |
Bulk Density g/cm3 |
Apparent Porosity % |
Thermal Expansion Coefficiency (%) |
Phase Composition Cordierite % |
| SiO2 |
Al2 O3 |
MgO |
| Synthetic Cordierite |
49-51 |
34-37 |
13-15 |
≥1.9 |
<25 |
1.8 |
≥95 |
|
BFA, WFA, Tabular Alumina: They are very important raw material for advanced refractory and abrasives.
Theirs properties are as following.
Brown Fused Alumina
|
| 95 Brown Fused Alumina |
| Chemical Composition |
True Density |
Mo's Hardness |
Micro Hardness |
| Al2 O3 |
≥95% |
>3.80g/cm3 |
9.0 |
2000-2200kg/mm2 |
| SiO2 |
≤1.5% |
| TiO2 |
≤3.3% |
| Fe2 O3 |
≤0.4% |
|
Tabular Alumina
|
| Items |
Guarantee Value% |
Typical Value% |
Chemical Composition |
Al2 O3 |
≥99.20 |
99.36 |
| SiO2 |
≤0.2 |
0.15 |
| Fe2 O3 |
≤0..1 |
0.02 |
| Na2 O |
≤0.4 |
0.38 |
Physical Character |
Bulk Density g/cm3 |
≥3.5 |
3.53 |
| Apparent Porosity % |
≤5.0 |
3.00 |
| Water absorption % |
≤1.0 |
0 |
|
White Fused Alumina
|
| Chemical Composition(%) |
Guarantee Value |
Typical Value |
Main-Phase |
Bulk Density g/cm3 |
| Al2 O3 |
≥99 |
99.25 |
α- Al2 O3 |
≥3.45 g/cm3 |
| SiO2 |
≤0.4 |
0.09 |
| Fe2 O3 |
≤0.1 |
0.09 |
| Na2 O+K2 O |
≤0.45 |
0.27 |
|
Silicon Carbide (SiC): the high thermal conductivity of the SiC gives product a good thermal shock resistance,
Silicon carbide widely used in produce SiC kiln furniture, SiC bricks, castable and monolithics.
|
| Type |
Reference Chemical Composition |
| SiC≥ |
F.C< |
T. Fe |
| SRC88 |
85.00 |
5.00 |
2.00 |
| SRC95 |
95.00 |
1.00 |
0.70 |
| SRC97 |
97.00 |
0.50 |
0.50 |
|
Flake Graphite: Flake graphite is a naturally occurring form of graphite that is typically
found as discrete flakes ranging in size from 50-800 micrometers in diameter and 1-150 micrometers thick.
This form of graphite has a high degree of crystallize, which equates to near theoretical true density,
high thermal and electric conductivity, and low spring back (excellent molding characteristics).
|
| Type |
Brand |
Specification |
| Fixed Carbon≥% |
Ash≤% |
Moisture≤% |
| High Carbon Graphite |
HC99-HC94 |
99-94 |
1.0-6.0 |
0.5 |
| Medium Carbon Graphite |
MC93-MC80 |
93-80 |
7.0-20.0 |
1.0 |
|