Quartz Grinding Project (18 TPH, 150 Mesh)
Quartz (SiO₂) is a versatile non-metallic mineral with high hardness, excellent thermal stability, and good chemical inertness, making it an essential raw material in the glass and foundry industries. This project, located in Anhui Province, China—a major quartz-producing region with abundant deposits—produces 150-mesh quartz powder at 18 TPH, supplying local glass factories and foundries with high-quality raw materials. The powder is used as a raw material for ordinary glass production and as foundry sand in metal casting, meeting the industrial demand for high-SiO₂ content and uniform particle size.
The raw quartz used in the project is medium-purity quartz with a SiO₂ content of ≥98%, sourced from a local mine with a proven reserve of over 10 million tons. The raw quartz contains impurities such as SiO₂ (98-98.5%), Al₂O₃ (1-1.5%), and Fe₂O₃ (0.3-0.5%), which are acceptable for ordinary glass and foundry applications. The raw quartz arrives at the project site as 100-200mm lumps, which undergo a two-stage crushing process to reduce the particle size to 10-20mm. First, a jaw crusher (PE500×750) crushes the blocks to 50-80mm, then a cone crusher (CSB220) further crushes them to 10-20mm, ensuring the feed size is suitable for the grinding mill.
After crushing, the 10-20mm quartz particles are conveyed to a 300-ton silo, which maintains a continuous and stable feed to the grinding system. The project uses a ball mill (Φ2.4×8m), which is widely used in quartz grinding due to its ability to handle hard materials and produce uniform powder. The ball mill is filled with high-chromium steel balls at a 33% filling rate, operating at 21 rpm, creating a cascading motion that grinds the quartz particles into fine powder.
Hot air (150-170°C) is blown into the ball mill to dry the quartz powder, reducing the moisture content from 5-7% to less than 0.8%, preventing agglomeration and ensuring uniform particle size. An air classifier, installed at the mill’s discharge end, separates particles finer than 150 mesh (106 μm) from coarser particles; the coarser particles are recycled back to the ball mill for regrinding, forming a closed-loop system that guarantees consistent fineness. The 150-mesh powder is collected by a pulse bag filter with a dust collection efficiency of 99.9%, ensuring dust emission ≤10 mg/m³, which complies with China’s environmental standards.
In the glass industry, the 150-mesh quartz powder is a key raw material for ordinary float glass and container glass, accounting for 60-70% of the raw material mix. It provides the necessary SiO₂ to improve glass hardness and transparency. In the foundry industry, the powder is used as foundry sand, which has high refractoriness and good permeability, ensuring the metal casting has a smooth surface and no defects. The project has a daily output of 432 tons of quartz powder, meeting the demand of nearby glass and foundry enterprises. With a total investment of 7.5 million yuan and a service life of 18 years, this project is a reliable supplier of quartz powder for the glass and foundry industries, promoting local industrial development.
