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BAUXITE
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There are abundant of bauxite with Al2O3
content at 38.0~61.0% in Chenxi county of Hunan proince,wherein
the AI/Si ratio of bauxite with Al2O3
content at 58.0~61.0% in 2.4~2.55,thusbeing the regin of
phase constition£» its average ratio is approximate 2.55,right
meeting the need of AI/Si ratio for M70 mullite.Also,there
is extremely low content of impurity low content of impurity
such as Fe2O3¡¢Tio2¡¢Na2O¡¢K2O
¡¢MgO ¡¢CaO and P2O5
in such natural bauxite .therefore it is kind of ideal raw
materlal for sintering mullite mith complete natural material
.
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chemcial composition of Chenxi bauxitre |
| Type |
Al2O3 |
Fe2O3 |
SiO2 |
TiO2 |
CaO |
MgO |
Na2O |
K2O |
Loss |
| M70rawmine |
59.66 |
0.81 |
22.51 |
1.93 |
0.05 |
0.42 |
0.01 |
0.15 |
14.43 |
| M60rawmine |
51.38 |
0.85 |
30.52 |
1.95 |
0.06 |
0.45 |
0.02 |
0.17 |
14.46 |
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| NATURAL SINTERED MULLITE |
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Manufactured directly from raw bauxite,fired
in a rotary kiln with heavy oil as fuel at temperatures
exceeding 1750¡æ.
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PHYSICAL
CHEMICAL PERFORMANCE INDEX |
| |
M70 |
M60 |
| Al203
% |
70-73 |
60-63 |
| Fe203
% |
1.1max
(1.2%max for fine) |
1.2max
(1.3%max for fine) |
| TiO2 % |
2.50max |
2.50max |
| CaO % |
0.25max |
0.25max |
| MgO % |
0.55max |
0.55max |
| Na20 % |
0.20max |
0.20max |
| K20 % |
0.20max |
0.20max |
| B.D. g/cm3 |
2.78min |
2.65min |
| Apparent Porosity% |
4.0min |
4.0min |
| Water Absorption % |
1.5max |
1.5max |
| Refractoriness ¡æ |
1830min |
1750min |
| Mullite Phases% |
90min |
80min |
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NATURAL
FUSED MULLITE |
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| Manufactured directly from raw bauxite,fused in an electric
arc melting furnace. |
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DM70 |
| Al2O3
% |
70-73 |
| Fe2O3
% |
0.3max |
| TiO2 % |
1.80max |
| CaO % |
0.2max |
| MgO % |
0.55max |
| Na2O % |
0.20max |
| K2O % |
0.20max |
| B.D. g/cm3 |
2.90min |
| Apparent Porosity
% |
2.0max |
| Water Absorption % |
0.8max |
| Refractoriness ¡æ |
1850min |
| Mullite Phases% |
90min |
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