May . 27, 2025 16:25
Wollastonite powder is a versatile industrial mineral derived from the calcium metasilicate mineral wollastonite (CaSiO₃). This naturally occurring, white to off-white crystalline mineral is found in metamorphic and sedimentary rocks, primarily in regions such as the United States, China, India, and Mexico.
The extraction process begins with mining raw wollastonite ore, which is then crushed and ground into fine particles using specialized machinery like jaw crushers, ball mills, and air classifiers. Further purification steps may include magnetic separation and flotation to remove impurities, ensuring high - quality powder. The final product ranges in particle size, with ultra-fine grades reaching sub - micron sizes for advanced applications.
Wollastonite powder’s unique properties—such as high aspect ratio (needle-like crystals), low moisture absorption, and excellent chemical stability—make it invaluable across industries. In ceramics, it reduces firing shrinkage and improves thermal shock resistance, enhancing the durability of tiles, tableware, and refractories. In paints and coatings, it acts as a reinforcing filler, increasing opacity, weather resistance, and scratch resistance. In plastics, it strengthens polymers, reduces warping, and improves dimensional stability, while also lowering production costs as a partial replacement for more expensive additives. Additionally, it is used in paper manufacturing to boost brightness and printability, and in welding rods to enhance arc stability.
