Calcium Carbonate Grinding Project (20 TPH, 200 Mesh)
Calcium carbonate (CaCO₃) is one of the most widely used non-metallic minerals in the paint and coating industry, acting as a filler to reduce production costs, improve paint coverage, and enhance coating performance. This project, located in Guangdong Province, China—a major paint production hub—produces 200-mesh high-purity calcium carbonate powder at 20 TPH, supplying local and national paint manufacturers with high-quality raw materials. The project is designed to meet the strict quality requirements of the paint industry, ensuring uniform particle size, high whiteness, and low impurity content.
The raw calcium carbonate used in the project is high-purity heavy calcium carbonate (CaCO₃ ≥95%), sourced from Henan Province, known for its high-quality calcium carbonate deposits with a whiteness value of ≥90% and impurity content (SiO₂, Fe₂O₃) ≤1%. The raw calcium carbonate arrives at the project site as 100-200mm blocks, which undergo a two-stage crushing process to reduce the particle size to 10-15mm. First, a jaw crusher (PE600×900) crushes the blocks to 50-80mm, then an impact crusher (PC1315) further crushes them to 10-15mm, ensuring the feed size is optimal for the grinding mill.
After crushing, the 10-15mm calcium carbonate particles are conveyed to a 400-ton silo, which maintains a continuous and stable feed to the core grinding equipment: a vertical roller mill (LM4500). The vertical roller mill is selected for its high efficiency, uniform product fineness, and low energy consumption, making it ideal for large-scale calcium carbonate grinding. The mill features a grinding table and four hydraulic rollers, operating at a rotational speed of 27 rpm, which grinds the calcium carbonate particles into fine powder efficiently.
Hot air (140-160°C) is blown into the vertical roller mill to dry the powder, reducing the moisture content from 4-6% to less than 0.5%, preventing agglomeration and ensuring uniform particle size. An integrated air classifier separates particles finer than 200 mesh (75 μm) from coarser particles; the coarser particles are recycled back to the grinding table for regrinding, forming a closed-loop system that guarantees consistent fineness. The 200-mesh powder is collected by a high-efficiency pulse bag filter with a dust collection efficiency of 99.9%, complying with China’s national environmental standards (dust emission ≤10 mg/m³).
The project has strict quality control measures, with particle size uniformity ≥95% and whiteness ≥90%, meeting the standards of the paint industry. In paint production, the 200-mesh calcium carbonate powder acts as a filler, reducing the amount of expensive binders (such as resin) by 20-30%, significantly lowering production costs. It also improves paint coverage, opacity, and weather resistance, ensuring the coating has a smooth surface and long service life. The powder is stored in a 800-ton silo, directly supplied to nearby paint manufacturers, with a stable market demand. The project has a total investment of 9 million yuan and a payback period of 2 years, incorporating energy-saving measures such as frequency converters and waste heat recovery, making it a cost-effective and environmentally friendly solution for calcium carbonate processing in the paint industry.
