On June 22, 2026, Anhui Hongyi New Material Technology Co., Ltd. made public the environmental assessment for its project to produce 100,000 tons per year of ultra-fine heavy calcium carbonate powder. The project is based in Wuhu City, with a total investment of 120 million yuan and a construction period of 3 months.

The project is designed to produce 100,000 tons per year of ultra-fine heavy calcium carbonate powder with particle sizes ≤5μm, using coarse calcium carbonate as raw material throughout the production process, without involving any mining. The project adopts a combination process of 'ring roller mill for coarse grinding, fluidized bed jet mill for ultra-fine grinding, and multi-stage air classification,' and the products are widely applicable to downstream uses such as high-end coatings, engineering plastics, papermaking, and functional new materials.

Wet grind heavy calcium carbonate to D90=2μm. It’s recommended to use Φ0.6-0.8mm yttria-stabilized zirconia beads (95% zirconia). If you need single-stage high-efficiency, you can combine with Φ0.4-0.6mm nano zirconia beads.

- Equipment type: must use a vertical or horizontal sand mill (bar/plate type); ordinary ball mills are hard to consistently reach D90=2μm