Bangladesh’s glass manufacturing sector has experienced steady growth over the past decade, driven by increasing demand for container glass, flat glass, and specialty glass products. While traditional raw materials such as silica sand, soda ash, and limestone dominate the batch composition, phosphate rock (typically in the form of apatite or phosphorite) plays a critical role in certain glass formulations. It acts as a fluxing agent, improves melting behavior, and imparts desirable optical properties—particularly in colored glasses, opal glasses, and phosphate-based specialty glasses. For glass producers in Bangladesh, locally sourced or imported phosphate rock must be ground to a specific fineness to ensure uniform distribution and optimal reaction kinetics in the melt. The target of 150 mesh (approximately 100 microns) is widely accepted as the standard for glass-making applications, balancing energy efficiency in grinding with adequate surface area for homogeneous melting.
However, achieving consistent 150-mesh powder from phosphate rock—which is typically a medium-hard material with Mohs hardness around 5–6 and a specific gravity of 3.0–3.2—requires robust, energy-efficient grinding equipment. Traditional ball mills, while common, often suffer from high power consumption, excessive wear, and inconsistent particle size distribution. This article explores the technical requirements for phosphate rock grinding in Bangladesh’s glass industry and presents state-of-the-art solutions from Shanghai Zenith Machinery Co., Ltd., a leading Chinese manufacturer of ore grinding equipment with extensive expertise in ultra-fine and medium-fine powder processing.
The selection of 150 mesh (D90 passing 100 µm) for phosphate rock in glass manufacturing is not arbitrary. At this fineness, the powder provides a balance between the following factors:
In Bangladesh, where humidity can be high during monsoon seasons, achieving a stable moisture content below 2% in the final powder is also a critical parameter, as excessive moisture can cause clumping and uneven melting. Modern grinding mills with integrated drying capabilities offer a distinct advantage in this climate.
While 150 mesh is a relatively coarse target compared to ultra-fine applications, several challenges must be addressed to ensure reliable, cost-effective production:
To address these challenges, Shanghai Zenith Machinery offers a range of grinding mills specifically designed for medium-hard materials like phosphate rock. Below we examine two highly suitable models: the MTW Trapezium Grinding Mill and the LM Vertical Grinding Mill.
Based on our extensive experience in the mineral processing industry and the specific requirements of glass-making in Bangladesh, we recommend two flagship products: the MTW Trapezium Grinding Mill for its proven reliability and ease of operation, and the LM Vertical Grinding Mill for its superior drying capability and compact footprint. Both mills can consistently produce phosphate rock powder at 100% passing 150 mesh with high throughput and low energy consumption.
The MTW series is a multi-patented, eco-friendly mill that integrates crushing, grinding, and classification into one unit. Its trapezoidal grinding ring and roller design increase the grinding efficiency by 40% compared to traditional Raymond mills. Key features include:
Table 1: Technical Parameters of MTW Trapezium Grinding Mill (Recommended Models for Phosphate Rock at 150 Mesh)
| Model | Max Feed Size (mm) | Final Size (mm) | Capacity (t/h) | Main Motor Power (kW) | Fan Motor Power (kW) |
|---|---|---|---|---|---|
| MTW110 | <30 | 1.6–0.045 | 3–9 | 55 | 55 |
| MTW138 | <35 | 1.6–0.045 | 6–17 | 90 | 110 |
| MTW175G | <40 | 1.6–0.045 | 9.5–25 | 160 | 200 |
| MTW215G | <50 | 1.6–0.045 | 15–45 | 280 | 315 |
For a typical glass plant requiring 10–15 t/h of 150-mesh phosphate rock, the MTW138 or MTW175G would be ideal selections, offering excellent cost-per-ton performance.
The LM series vertical mill integrates grinding, drying, and classification in a single system. Its vertical roller design allows for high grinding efficiency and low energy consumption. For phosphate rock with moisture content up to 10%, the built-in hot air drying system can reduce the moisture to below 1% in the final product. Advantages for glass manufacture:
Table 2: Technical Parameters of LM Vertical Grinding Mill (Vertical Mineral Mill Series)
| Model | Plate Diameter (mm) | Capacity (t/h) | Output Fineness (µm) | Max Feed Size (mm) | Main Motor Power (kW) |
|---|---|---|---|---|---|
| LM130K | 1300 | 10–28 | 170–40 | <38 | 200 |
| LM190K | 1900 | 23–68 | 170–40 | <45 | 500 |
| LM280K | 2800 | 50–170 | 170–45 | <50 | 1250 |
For a production scale of 20–30 t/h, the LM190K delivers high capacity with precise 150‑mesh control, making it a top choice for larger glass manufacturing facilities in Bangladesh.
Both the MTW and LM mills offer distinct benefits that align with the operational realities of Bangladeshi glass manufacturers:
Phosphate rock grinding to 150 mesh is a well-established process that demands reliability, efficiency, and precision. For glass manufacturers in Bangladesh aiming to optimize their raw material preparation, Shanghai Zenith Machinery Co., Ltd. provides world-class solutions backed by decades of expertise in industrial milling. The MTW Trapezium Grinding Mill offers a cost-effective, easy-to-operate option for small to medium throughputs, while the LM Vertical Grinding Mill excels in large-scale operations with integrated drying capabilities. By investing in Zenith’s advanced grinding technology, glass producers can achieve consistent 150-mesh powder quality, lower energy bills, and higher overall production efficiency. Contact us today to discuss your specific requirements and arrange a site survey or trial run.
Shanghai Zenith Machinery Co., Ltd. – Your partner in powder processing excellence.
