Dolomite milling line for Thailand glass production

Introduction to Dolomite in Glass Manufacturing

Thailand has emerged as a significant player in the global glass industry, with a growing demand for high-quality flat glass, container glass, and specialty glass. One of the key raw materials for glass production is dolomite (CaMg(CO₃)₂), which provides both calcium oxide (CaO) and magnesium oxide (MgO) to the glass batch. These oxides act as stabilizers, improving the chemical durability, mechanical strength, and thermal resistance of the final glass product. In Thailand, dolomite is abundantly available, but to meet the strict specifications of glass manufacturers, it must be finely ground to a consistent particle size, typically between 200 and 325 mesh (74–45 microns). This requires a reliable, efficient, and energy-saving milling line. Shanghai Zenith Machinery Co., Ltd., a leading Chinese manufacturer of ore grinding equipment with extensive experience in ultra-fine powder grinding, offers tailored solutions for the Thai glass industry.

Why a Dedicated Dolomite Milling Line Is Essential

Raw dolomite as mined contains impurities and a wide range of particle sizes. Direct use without processing leads to poor melting, segregation in the batch, and defects in the glass. A dedicated milling line ensures:

• Uniform particle size distribution (D97 typically < 150 μm for glass grade)
• Low iron content to avoid discoloration
• High throughput to meet industrial-scale production
• Energy efficiency to reduce operational costs in Thailand’s competitive market

Shanghai Zenith Machinery has been at the forefront of developing advanced milling technologies that address these exact challenges, with equipment widely used in Thailand and Southeast Asia.

Recommended Solutions: MTW Trapezium Grinding Mill & LM Vertical Grinding Mill

Based on the specific requirements of dolomite grinding for glass production, we highly recommend the MTW Trapezium Grinding Mill and the LM Vertical Grinding Mill from Shanghai Zenith. Both machines excel in producing fine powders with narrow particle size distribution, low energy consumption, and high operational stability.

1. MTW Trapezium Grinding Mill

The MTW series is a patented grinding mill with a compact structure and an eco-friendly design. It is specifically suitable for processing materials with a maximum feed size of 50 mm, producing a final product as fine as 0.038 mm (400 mesh). For glass-grade dolomite (typically 200–325 mesh), the MTW110, MTW138, and MTW175 models are ideal choices. Key parameters from our product catalogue:

The trapezoidal grinding ring and roller design increase the grinding efficiency by 30% compared to traditional Raymond mills, while the built-in separator ensures a consistent product fineness. This mill is particularly advantageous for Thai glass plants that require medium to high capacity with low maintenance.

2. LM Vertical Grinding Mill

For larger-scale operations or when a single machine integrating crushing, grinding, drying, and classifying is preferred, the LM Vertical Grinding Mill is unbeatable. The LM series features a vertical roller design with a small footprint, making it easy to install in existing glass production facilities. The LM130K, LM190K, and LM280K models are well-suited for dolomite milling:

The LM mill’s integrated drying function allows processing of dolomite with up to 6% moisture without a separate dryer. Its intelligent control system automatically adjusts the grinding pressure and separator speed, ensuring stable product quality even with variations in feed material. For a typical Thai glass plant requiring 20 t/h of 200-mesh dolomite powder, the LM190K offers an excellent balance of capacity and energy efficiency.

Complete Dolomite Milling Line Configuration

A typical dolomite milling line for Thai glass production includes the following stages:

1. Primary Crushing: A jaw crusher reduces run-of-mine dolomite (up to 300 mm) to <50 mm.
2. Secondary Crushing: A hammer mill or cone crusher further reduces to <30 mm for feeding into the mill.
3. Grinding: The core unit – choose either the MTW Trapezium Mill or LM Vertical Mill – grinds the dolomite to the required fineness (e.g., 200 mesh).
4. Classifying: An integral classifier (or external classifier) ensures that oversize particles are returned to the mill.
5. Dust Collection: A bag filter or cyclone collector captures the fine powder, with a fan providing the necessary airflow.
6. Product Storage: The finished dolomite powder is conveyed to silos and then packed or directly fed into the glass batch mixer.

Shanghai Zenith provides comprehensive engineering support, from site survey to installation and commissioning, ensuring the line meets Thailand’s local electrical standards and environmental regulations.

Key Advantages of Zenith Equipment for Thai Glass Producers

• High Purity Protection: The grinding chamber is designed to minimize iron contamination, which is critical for white glass production.
• Energy Savings: Both the MTW and LM mills consume 20–30% less power than traditional ball mills, delivering lower cost per ton.
• Automatic Operation: PLC control reduces labor dependency – a major advantage in Thailand’s evolving industrial landscape.
• Proven Performance: Many installations across Southeast Asia, including in Thailand, have demonstrated over 95% availability with routine maintenance.

Conclusion

Thailand’s glass industry is set for further expansion, and the quality of dolomite powder directly impacts the competitiveness of glass products. Shanghai Zenith Machinery Co., Ltd., with its world-class portfolio of grinding mills and deep expertise in ultra-fine powder grinding, offers the ideal solution. The MTW Trapezium Grinding Mill provides high-efficiency medium-capacity grinding, while the LM Vertical Grinding Mill delivers large-scale integrated processing. Both machines are built to withstand the rigorous demands of 24/7 operation, ensuring Thai glass producers achieve consistent quality, lower costs, and sustainable growth. For a customized dolomite milling line, contact our team for a detailed feasibility study and quotation.