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Introduction
Wollastonite can reduce the sintering temperature and shorten the sintering time, achieve a low-temperature sintering, and can save a lot of fuel, at the same time improve the mechanical properties of the products, reduce crazing, crack, breakage, enamel defects, such as warping and problems. It can also improve green strength, reduce the product weight, increase luster glaze, reduce the glaze mud viscosity.
Chemical Properties
| Item |
Index |
| SiO2 |
45-55% |
| CaO |
40-50% |
| Fe2O3 |
1.0%max |
| S |
0.04%max |
| P |
0.04%max |
| Al2O3 |
1.5%max |
| MGO |
1.5%max |
| L.O.I |
1.5-4.0%max |
| Sedimentation |
30 Minutes |
| pH Value |
7-9 |
Physical Properties
| Item |
Index |
| Whiteness |
90min |
| Mohs Hardness |
4.5 |
| Specific gravity |
2.90% |
| Refractive Index |
1.63 |
| Surface Water &le |
0.30% |
Application
Wollastonite has industrial importance worldwide.
It is used in many industries, mostly by tile factories which have incorporated it into the manufacturing of ceramic to improve many aspects, and this is due to its fluxing properties, freedom from volatile constituents, whiteness, and acicular particle shape. In ceramics,wollastonite decreases shrinkage and gas evolution during firing, increases green and fired strength, maintains brightness during firing, permits fast firing, and reduces crazing, cracking, and glaze defects.
In metallurgical applications, wollastonite serves as a flux for welding, a source for calcium oxide, a slag conditioner, and to protect the surface of molten metal during the continuous casting of steel.
As an additive in paint, it improves the durability of the paint film, acts as a pH buffer, improves its resistance to weathering, reduces gloss,reduces pigment consumption, and acts as a flatting and suspending agent.In plastics, wollastonite improves tensile and flexural strength reduces resin consumption, and improves thermal and dimensional stability at elevated temperatures. Surface treatments are used to improve the adhesion between the wollastonite and the polymers to which it is added.
As a substitute for asbestos in floor tiles, friction products, insulating board and panels,paint, plastics, and roofing products, wollastonite is resistant to chemical attack, inert,stable at high temperatures, and improves flexural and tensile strength.
In some industries,it is used in different percentages of impurities such as its use as,a fabricator of mineral wool insulation,or as an ornamental building material.and rubber applications were estimated to account for 25% to 35% of U.S. sales in 2009, followed by ceramics with 20% to 25%; paint, 10% to 15%; metallurgical applications, 10% to 15%; friction products, 10% to 15%; and miscellaneous, 10% to 15%. Ceramic applications probably account for 30% to 40% of wollastonite sales worldwide, followed by polymers (plastics and rubber) with 30% to 35% of sales, and paint with 10% to 15% of sales. The remaining sales were for construction, friction products, and metallurgical applications.
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