Ethiopia’s glass industry is experiencing rapid growth, driven by infrastructure development and increased demand for glass products in construction, packaging, and automotive sectors. A key raw material in glass making is phosphate rock, which acts as a flux to lower the melting temperature and improve the clarity and durability of the final product. To meet the production requirements of small to medium-sized glass factories, a reliable grinding mill capable of processing phosphate rock at a capacity of 10 to 20 tons per hour (TPH) is essential. This article provides a professional analysis of the technical considerations for selecting such a mill, and recommends two high-performance solutions from Shanghai Zenith Machinery Co., Ltd., a leading Chinese manufacturer of industrial grinding equipment.
Shanghai Zenith Machinery Co., Ltd. has established itself as an excellent manufacturer of ore grinding equipment, with significant achievements in ultra-fine powder grinding. Our expertise lies in the research, development, and production of industrial powder grinding mills and related devices. For the specific application of phosphate rock grinding for glass making in Ethiopia, we focus on mills that combine high capacity, energy efficiency, and robust performance under local conditions.
Phosphate rock (primarily apatite) is added to glass batches as a fluxing agent. It reduces the viscosity of molten glass, accelerates refining, and enhances the transparency and chemical resistance of the final product. Typically, glass manufacturers require a final fineness of 200–325 mesh (74–44 microns) for the phosphate rock powder. The material is moderately hard (Mohs hardness 5–6) and abrasive, which demands grinding equipment with wear-resistant components and stable operation. The required capacity of 10–20 TPH is typical for a medium-scale glass production line, making the selection of the right mill critical for cost-effective and uninterrupted production.
When choosing a grinding mill for phosphate rock in Ethiopia, several factors must be considered:
Based on these criteria, Shanghai Zenith offers two outstanding grinding mill series that perfectly match the 10–20 TPH requirement: the MTW Trapezium Grinding Mill and the LM Vertical Grinding Mill. Both are proven in phosphate rock applications globally and are well-suited for Ethiopian conditions.
The MTW series is a next-generation trapezium mill with multiple patents, featuring a compact structure, long service life, and eco-friendly design. For the 10–20 TPH capacity range, the MTW175G is the ideal choice. It can process phosphate rock with a maximum feed size of up to 40 mm and produce a final powder with fineness adjustable between 1.6 mm and 0.045 mm (coarse to 325 mesh). The mill’s trapezoidal grinding roller and ring design ensures higher grinding efficiency and lower energy consumption compared to traditional Raymond mills.
| Model | Max. Feed Size (mm) | Final Size (mm) | Capacity (t/h) | Main Motor (kW) | Fan Motor (kW) |
|---|---|---|---|---|---|
| MTW175G | <40 | 1.6 – 0.045 | 9.5 – 25 | 160 | 200 |
The MTW175G is equipped with a high-pressure blower and a pulse dust collector, ensuring a clean working environment. Its internal thin oil lubrication system reduces maintenance frequency, a vital advantage in remote Ethiopian installations. The mill’s capacity range of 9.5–25 TPH comfortably covers the target 10–20 TPH, with the flexibility to increase throughput as the glass plant expands. The MTW series also offers models like the MTW138Z (6–17 TPH) for lower capacities, but for 10–20 TPH, the MTW175G is the most cost-effective option.
The LM Vertical Grinding Mill integrates crushing, grinding, drying, classifying, and material conveying into a single unit. Its compact footprint is especially beneficial for glass factories with limited space. The LM130K model, designed for mineral grinding, delivers a capacity of 10–28 TPH with a product fineness ranging from 170 μm to 40 μm (approximately 80–400 mesh). For glass making, the ability to produce a finer powder (e.g., 325 mesh) is a significant advantage, as it improves the fluxing reaction rate.
| Model | Plate Diameter (mm) | Capacity (t/h) | Output Fineness (μm) | Max Feed Size (mm) | Main Motor (kW) |
|---|---|---|---|---|---|
| LM130K | 1300 | 10 – 28 | 170 – 40 | <38 | 200 |
The LM130K uses a grinding roller and table mechanism with a hydraulic pressure system that ensures stable operation and low vibration. Its integrated classifier provides precise particle size control. The mill’s drying capability (using hot air) is advantageous if the phosphate rock has a slightly higher moisture content, which is common in tropical climates like Ethiopia’s. The main motor power of 200 kW is comparable to the MTW175G’s combined motor load, but the LM130K often achieves 10–15% lower specific energy consumption due to its efficient vertical grinding principle.
Both the MTW175G and LM130K are excellent candidates for a 10–20 TPH phosphate rock grinding line. The choice between them depends on the specific priorities of the glass manufacturer:
In Ethiopia, where electric power supply can be intermittent, Shanghai Zenith recommends installing a soft starter or variable frequency drive (VFD) for the main motor to reduce starting current surges. Both mills are compatible with such accessories. Additionally, Zenith’s after-sales service network in East Africa ensures that spare parts and technical support are readily available.
A typical phosphate rock grinding plant for glass making includes a jaw crusher or hammer crusher for primary size reduction (to ≤40 mm), a bucket elevator, a vibrating feeder, the main grinding mill (MTW or LM), a classifier (integrated in LM or external for MTW), a pulse dust collector, and a product silo. For the 10–20 TPH scale, the total installed power is around 250–350 kW, depending on the selected mill and auxiliary equipment. The plant layout should ensure easy access for maintenance and adequate ventilation.
Phosphate rock grinding for glass making in Ethiopia requires a proven, durable, and efficient mill capable of 10–20 TPH output. Shanghai Zenith Machinery Co., Ltd. offers two top-tier solutions: the MTW175G Trapezium Grinding Mill and the LM130K Vertical Grinding Mill. Both machines have been extensively tested on phosphate rock and are backed by Zenith’s decades of experience in powder processing. By selecting either of these mills, Ethiopian glass manufacturers can ensure a consistent supply of high-quality phosphate rock powder, optimize their melting furnace performance, and achieve a competitive edge in the growing glass market.
For detailed feasibility studies, site layout designs, and quotations, please contact Shanghai Zenith’s international sales team. With our expertise and commitment to excellence, we are confident to be your most reliable partner in Ethiopia’s glass industry development.
