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High Purity Wollastonite

2010-05-10 15:10:16 Author:admin Source: Views:0

High purity wollastonite is a natural mineral of Calcium Metasilicate with chemical formula as CaO.SiO2, the theoretical composition: CaO 48.25%, SiO2 51.75%.

Wollastonite has three types of crystals. with density 2.87~3.09 and hardness 4.5~5.0, a single crystal looks like a slim board, while combined ones is like fiber, piece or radiation. In ceramic Industry, being as a good substitute for limestone and quartz, High purity wollastonite can be used for glazed tile, polished tile, usual tile and glaze. Also, it has great fluxing power when used with nepheline syenite. In addition, It can reduce the firing temperature and improve body sintering capacity. Followings are wollastonite¡¯s main features.

Not containing organic compound, hydroscopic water or water crystal. It does not give out gases when being fired. It can replace limestone and quartz to make glaze without causing glaze bubbles or openings, which improves the product quality. The shrinking in drying up and firing can also be small because of the homogeneity in change, as a result of relatively small swelling coefficient.

Crystal appears being like needle shape, which is good for product molding and can make quick drying up.

It has great fluxing power, which can reduce the body sintering temperature, shorten the firing period, save energy and producing cost as well as improve producing capability.

It improves the products¡¯ mechanical strength and reduces the moisture expansion.
5¡¢ It can improve the gloss when used in mat glaze.

component (%)
SiO2: 50±1 CaO:42±1 Al2O3:≤1  Fe2O3:≤0.2 LOI:≤1.5

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