Marble Grinding Project (8 TPH, 180 Mesh)
Marble is a high-value non-metallic mineral renowned for its elegant texture, high whiteness, and chemical stability, making it a popular raw material in architectural coatings, artificial marble production, and decorative materials. This project, located in Henan Province, China—a major marble-producing region with abundant high-quality marble deposits—focuses on processing natural marble into 180-mesh powder with a production capacity of 8 tons per hour (TPH). The powder is primarily used to manufacture high-gloss architectural coatings and artificial marble slabs, catering to the growing demand for eco-friendly and aesthetically pleasing building materials in the domestic and international markets.
The raw marble used in this project is sourced from a local quarry, known for its pure white marble with a whiteness value of ≥85%, calcium carbonate (CaCO₃) content of 95-98%, and minimal impurities (SiO₂ ≤1.5%). The raw marble arrives at the project site as large blocks with a maximum particle size of 300-500mm, which first undergo primary crushing using a jaw crusher (PE600×900) to reduce their size to 50-100mm. A cone crusher (CSB220) then further crushes the marble to 15-25mm, an optimal feed size for the grinding mill, ensuring efficient and uniform grinding.
After crushing, the 15-25mm marble particles are conveyed to a surge bin, which maintains a continuous and stable feed to the core grinding equipment: a ball mill (Φ2.2×7m). The ball mill is filled with high-chromium steel balls at a 30% filling rate, operating at a rotational speed of 22 rpm. The cascading motion of the steel balls grinds the marble particles into fine powder, while hot air (120-140°C) is blown into the mill to dry the powder and prevent agglomeration, reducing the moisture content to less than 0.8%.
An air classifier, installed at the discharge end of the ball mill, is set to separate particles based on size, ensuring only particles finer than 180 mesh (approximately 83 μm) are collected. The classifier’s variable-speed impeller (1500-1700 rpm) guarantees consistent fineness, with a uniformity coefficient (d90/d10) of less than 2.8. The 180-mesh marble powder is captured by a high-efficiency pulse bag filter with a dust collection efficiency of 99.9%, ensuring dust emission concentrations are below 10 mg/m³, which complies with China’s national environmental standards.
To enhance energy efficiency and reduce operational costs, the project incorporates a waste heat recovery system, which recycles heat from the ball mill’s exhaust gas to preheat the raw marble particles before grinding. This system reduces energy consumption by 20% compared to traditional marble grinding projects, translating to annual energy savings of approximately 120,000 kWh. The powder is stored in a 200-ton silo, directly supplied to nearby coating and artificial marble manufacturers. In architectural coatings, the marble powder improves gloss, adhesion, and weather resistance, while in artificial marble production, it provides a natural texture and high hardness, replacing 30-40% of natural marble and reducing resource consumption. With a total investment of 5 million yuan and a designed service life of 18 years, this project balances economic benefits with environmental protection, setting a model for sustainable marble processing.
