PRODUCTS
Sillimanite-Kyanite
Sillimanite-Kyanite is a new type of refractory material, a high-alumina mineral, with strong resistance to chemical corrosion, high thermal shock mechanical strength, and irreversible thermal expansion. It is used to produce amorphous materials and electric furnace roof bricks, phosphate non-burning bricks, and mullite. The main raw material of stone bricks and low-creep bricks is also a metamorphic
Composition: Premium materials such as high alumina oxide, magnesium oxide, and silicon carbide, with customizable composition based on client requirements.
Form: Available in powder, brick, board, and castable forms to suit various application needs.
Refractoriness: Standard range from 1200°C to 1800°C, with options for higher temperature customization.
Application Fields: Widely used in industries such as steel, cement, glass, and petrochemicals for furnace lining and insulation.
Packaging: Options include 25 kg bags, bulk bags, and custom packaging solutions compliant with global transportation standards.
Introduction
Our experienced R&D team can customize the material, form, and size according to your specific application needs while ensuring compliance with international quality standards. With rigorous quality control and advanced production facilities, we guarantee products with high refractoriness, excellent compressive strength, and long-lasting durability. Whether you are in the steel, cement, glass, or petrochemical industry, we are your trusted partner, supporting the success of your projects.
For customization inquiries, please feel free to contact us. We will provide tailor-made solutions based on your requirements.
Sillimanite-Kyanite Details
Sillimanite-Kyanite is mainly produced in regional metamorphic crystalline schist, and its metamorphic facies range from greenschist facies to amphibolite facies.
Features:
(1) Thermal expansion: It is converted into a mixture of mullite and kyanite during the heating process. During this conversion process, the mineral expands in volume and forms a good needle-like network of inlite, which expands in volume. The rate is 16-18%.
(2) Stability: The stability of refractories produced by kyanite minerals is 1.5 times higher than that of clay refractories. Kyanite refractory bricks have a 43% lower loss than clay bricks and have a life span of 150-200 furnaces longer than clay bricks.
(3) High refractoriness: The refractoriness of general clay refractory materials is 1670-1770℃, while the refractory materials of kyanite are usually higher than 1790℃, and the highest is higher than 1850℃.
(4) Irreversibility: Calcining kyanite mineral into mullite is an irreversible transformation. It is stable at a temperature below 1810°C. Therefore, mullite refractories have the characteristics of stable volume at high temperature, low expansion rate, strong chemical resistance, high mechanical strength and strong thermal shock resistance.
Application：
(1) As a permanent expansion characteristic (directly adding unshaped refractory materials, such as castables, plastics, and cement as high-temperature expansion agent), only adding 5% to 15% can improve the load softening temperature compressive strength of the product, Improve the line change index after burning, eliminate the shrinkage cracks, peeling off and affect the service life of the amorphous refractory material during high temperature and cooling, so as to prolong the service life of the furnace lining.
(2) Aluminate fibers produced from kyanite high alumina minerals can be used to make parts for automobiles, spacecraft and radar.
(3) The mullite formed by calcination can be used to make high-grade refractory materials, which can prolong the furnace life by 5-6 years and save energy when used in high-temperature furnaces.
(4) It can be made into kyanite cement by adding 5% to 15% of high alumina cement. The refractory temperature is as high as 1650℃, which can be used in military construction.
Physical And Chemical Indicators :
|
Chemical Analysis |
Guaranteed |
Typical |
|
Al₂O₃,%,min |
57 |
58 |
|
TiO₂,%,max |
2.5 |
0.9-1.1 |
|
Fe₂O₃,%,max |
0.8 |
0.8 |
|
CaO,%,max |
0.2 |
0.1 |
|
MgO,%,max |
0.4 |
0.2 |
|
Moisture,%,max |
0.5 |
0.1 |
|
Physical dedscription and properties |
|
|
Kyanite-Sillimanite,% |
93-94 |
|
Melting point,℃ |
~1850 |
|
Mullite transformation,℃ |
1350-1550 |
|
Specific Gravity,kg/m³ |
3200-3500 |
|
Bulk density,kg/m³ |
1860-1920 |
|
Grain size,mkm |
63-100 |
|
Sieve Aperture(microns) |
Cumulative retained,% |
|
+200 |
4 |
|
+160 |
40 |
|
+100 |
90 |
|
+63 |
99.7 |
