Needle shaped wollastonite powder for papermaking industry building materials industry rubber plastic metallurgical products

1. Welding and Metallurgy

• Welding Rods:
  Wollastonite is a key component in flux coatings for arc welding rods. Its low iron content and stable melting point (1,540°C) ensure consistent arc stability and slag detachability. A welding equipment manufacturer improved weld bead quality by 30% using a flux formula with 18% wollastonite.
• Foundry Mold Coatings:
  In metal casting, wollastonite-based coatings (sprayed onto sand molds) reduce friction between molten metal and the mold, minimizing surface defects. This application is critical in producing high-precision parts for aerospace and medical devices.

2. Environmental and Sustainable Applications

• Soil Remediation:
  Wollastonite’s alkaline properties are used to neutralize acidic soils (pH < 5.5) in agricultural reclamation projects. In a case in Southeast Asia, adding 2–3% wollastonite powder to degraded farmland increased crop yields by 15% within one growing season.
• Recycled Plastics:
  In post-consumer plastic recycling, wollastonite reinforces recycled polymers (e.g., rPET, rHDPE) to restore mechanical properties. A recycling facility in Japan achieved a 25% improvement in impact strength for recycled plastic pallets by blending 12% wollastonite.

• 3. Paper and Packaging

  • High-Brightness Paper:
    In premium paper grades (e.g., glossy magazines), wollastonite (10–15% filler) boosts brightness (up to 92% ISO) and smoothness, replacing costly kaolin clay. A paper mill in North America achieved a 10% reduction in coating costs while maintaining print quality.
  • Corrugated Board:
    Adding 5–8% wollastonite to paper pulp enhances stiffness and reduces moisture absorption in corrugated sheets, improving load-bearing capacity for heavy packaging (e.g., electronics, machinery).