Kyanite is a typically blue silicate mineral, commonly found in aluminium rich metamorphic or sedimentary rocks. Kyanite is a member of the alumino-silicate series, which includes the polymorphs, alusite and sillimanite, which have the same chemical composition (Al2O3.SiO2) as alusite and sillimanite but it is distinguished from those two minerals by its physical properties.
Manufacturing Kyanite Powder Since 1994
Kyanite is easily distinguished from sillimanite and alusite by its tabular, long bladed, circular form and by bluish color; and slightly lower hardness than sillimanite and alusite. Another important property is its double hardness. Its specific gravity is 3 to 3.7.
Properties of Kyanite Powder Manufactured
1.Tactile properties: It is smooth, slippery and soapy.
- Color: It is blue, green and white in color.
- Lustre: It is vitreous
- Streak: It is white.
- Diaphaneity: It is transparent to translucent.
- Hardness: 4-7 mohs
- Specific gravity: 3.6
4.Affinity to water: It is hydrophobic and insoluble in water.
- It does not conduct heat.
- Its notable volume increase with heat.
- It has high specific heat capacity.
- It can withstand temperatures upto 1300ºC.
6.Electric properties: It does not conduct electricity.
7.Combustion properties: It is non explosive and non-inflammable.
8.Chemical properties: It is insoluble in acids and alkalis.
Applications of Kyanite Powder
KYANITE IN CERAMICS
Calcined kyanite(mullite) is used in ceramic products. Mullite morphology is important for this application. There are two common morphologies for mullite.
One is a platelet shape with low aspect ratio and the second is a needle shape with high aspect ratio. In the needle shape mullite,The needles interlock imparting tremendous mechanical strength as well as thermal shock resistance to the ceramic product.
The needle shape mullite forms if the ratios basic materials such as sodium and calcium are low. Anand Talc is a supplier of low iron containing raw kyanite with minimum basic impurities so as to exhibit successful performance in the ceramic industry.
KYANITE IN REFRACTORY MATERIALS
Refractories are heat-resistant materials that constitute the linings for high-temperature furnaces and reactors and must be able to withstand high temperatures, mechanical wear, thermal shock and chemical corrosion. Kyanite is used in refractories sometimes in raw form and mostly in calcined form.
1. Raw kyanite: Kyanite has high expansion coefficient. Moreover, its calcination into mullite is also accompanied by a significant expansion in volume (20%). Raw kyanite as a refractory material is thus particularly beneficial when shrinkage from other materials and binders needs to be compensated for.
2. Calcined kyanite: Kyanite calcined to mullite is widely utilized in refractory products. Mullite exhibits excellent refractory properties like thermal stability (it is stable upto 1810ºC), thermal shock resistance, creep resistance, and high hot strength and chemical corrosion resistance.
Refractory bricks made from calcined kyanite possess outstanding:
- Higher modulus of rupture.
- Lower co-efficient of expansion.
- Increased firing range and temperature.
- Increased durability, about three times that of ordinary bricks.
- More resistance to salt attacks.
- Very low co-efficient of spalling.
Kyanite refractories find application used in glass industry as well as various metallurigical industries (except steel metallurgy, as mullite refractory bricks are corroded by iron slag and are not highly resistant to metallic oxides).
Anand Talc has been a supplier of raw kyanite for many years. Our kyanite is high in purity, free from iron oxide, silica, bases and alkalis. These impurities considerably reduce the softening point of mullite and thus affect the refractory properties. Indian kyanite is often associated with the mineral corundum. This is advantageous as it reduces the percentage of free silica when calcined. All in all.
Anand Talc offers high quality refractory grade raw kyanite that gives good results in raw form as well as after calcination.
KYANITE IN ELECTRICAL COMPONENTS
Kyanite and mullite are widely used in the manufacture of electrical products due to its low electrical conductivity, high thermal stability and chemical inertness. It is used in electronics, burner tips, spark plugs, heating elements and high voltage electrical insulations.
Anand Talc offers high quality raw kyanite. Presence of impurities such as iron oxide alters the electrical conductivity of the product. We therefore, take due care to supply pure kyanite, for its successful application in manufacturing electrical components.
Kyanite Powder Manufacturing in Kumarasamy Industries
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