Do you know all uses of wollastonite?-3 BY:Danny

What are the main types of wollastonite The main types of wollastonite include the following:

5. As a filler for paint coatings
Wollastonite has a bright color and high reflectivity, making it suitable for producing high-quality white paint and clear and transparent colored paint. The quality requirements for paint coatings on wollastonite are: SiO2≥49%，CaO≥45%，Fe2O3≤0.2%， The oil absorption of 325 mesh mineral powder is 20-25g/100g, the water-soluble content is ≤ 0.5%, and the pH value of water extraction is 7-9325 mesh mineral powder with a whiteness of ≥ 90%. Needle shaped wollastonite is an excellent leveling agent with high color coverage and uniform distribution; It has the characteristic of UV resistance and is widely used in interior wall coatings, exterior wall coatings, special coatings (especially fireproof coatings), and latex paints. Replacing titanium dioxide with wollastonite powder in the production of paint and coatings can not only improve the color of products, enhance the smoothness of paints, increase the tensile strength of coatings, reduce cracks, but also reduce oil absorption and enhance corrosion resistance. The finer the particle size, the higher the whiteness and pH value, and the better the color and coating properties of the paint. Moreover, the paint appears alkaline and can be used as an anti-corrosion coating for metal equipment such as steel parts. Wollastonite can also be used as a filler for paint coatings, which can improve the physical and chemical properties, durability, and weather resistance of products, and reduce paint breakage and aging.

6. Used for metallurgical casting materials
The basic requirements for mold casting of protective slag are low density, low melting point, alkalinity (CaO/SiO2) ratio less than 1, appropriate melting rate, and good spreading properties. Wollastonite has low-temperature melting characteristics, stable chemical composition, high purity, and a neutral alkalinity (CaO/SiO2). This excellent characteristic provides an ideal raw material for protective casting materials in metallurgical steelmaking, especially for wollastonite which contains very little Al2O3. Therefore, the metallurgical protective slag produced has a strong ability to adsorb harmful Al2O3 inclusions in steel water, and is widely used in the metallurgical industry. The raw materials for metallurgical additives require wollastonite to be ≥ 50%, calcite to be ≤ 50%, and quartz to be ≤ 5%, S≤0.01%，P≤0.01%。 Every year, 12% to 15% of the world's wollastonite is consumed in this field. Nowadays, from ordinary carbon steel and manganese steel to stainless steel continuous casting, slag types such as small billets, large billets, large plate billets, and external refining have widely used protective slag based on wollastonite, which quickly replaced expensive imported protective slag and promoted the development of the metallurgical steelmaking industry.

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