Bangladesh has a rapidly expanding rubber manufacturing sector, producing tires, hoses, belts, footwear, and various molded goods. To reduce costs and improve performance, manufacturers increasingly use mineral fillers. Phosphate rock, primarily composed of calcium phosphate, is an attractive filler due to its availability, low cost, and ability to enhance certain mechanical properties. However, raw phosphate rock must be finely ground to be suitable as a rubber filler. This article focuses on selecting the right grinding mill for processing phosphate rock into rubber filler at a capacity of 20-30 tons per hour (tph) in Bangladesh. Shanghai Zenith Machinery Co., Ltd., a leading Chinese manufacturer of ore grinding equipment, offers robust solutions for this application.
Phosphate rock is a sedimentary rock containing high levels of phosphate minerals. When used as a filler in rubber, it can improve tensile strength, tear resistance, and abrasion resistance, while reducing the amount of expensive carbon black or silica. For optimal performance, the phosphate rock must be ground to a fine powder. The typical particle size required for rubber filler ranges from 200 to 400 mesh (about 74 to 38 microns), with some applications requiring even finer sizes. The grinding process must also be efficient, energy-saving, and environmentally friendly, as fine powders can cause dust pollution.
In Bangladesh, the rubber industry often operates in humid and hot conditions. Therefore, the grinding mill should be capable of handling materials with some moisture content and be resistant to corrosion. A capacity of 20-30 tph is considered medium-scale, suitable for a dedicated filler production line or a large rubber factory. Key factors when selecting a mill include: capacity, final fineness, energy consumption, maintenance cost, and footprint.
When choosing a grinding mill for phosphate rock, several technical aspects must be evaluated. First, the hardness of phosphate rock is typically 3-5 on the Mohs scale, which is medium-hard. This means the mill’s grinding elements must be wear-resistant. Second, the required fineness determines the type of mill: for 200-400 mesh, both trapezium mills and vertical mills are suitable. Third, the capacity of 20-30 tph narrows the selection to models with appropriate grinding area and motor power. Fourth, energy efficiency is crucial for reducing operational costs. Finally, the mill should have a compact design and low noise/vibration to comply with environmental regulations.
Shanghai Zenith offers several mills that meet these criteria, including the MTW Trapezium Grinding Mill and the LM Vertical Grinding Mill. Below, we recommend two specific models that perfectly match the 20-30 tph requirement.
The MTW Trapezium Grinding Mill is a patented product known for its compact structure, long service life, and eco-friendly design. It is ideal for grinding phosphate rock into rubber filler. With a maximum input size of 50mm and a final product fineness as fine as 0.038mm (400 mesh), the MTW mill ensures uniform particle size distribution. The mill features a bevel gear transmission, internal lubrication system, and curved blade design for higher efficiency. For the 20-30 tph capacity, the MTW215G model is the best choice. Its capacity ranges from 15 to 45 t/h, easily covering the required 20-30 tph. The main motor power is 280 kW, and the fan motor is 315 kW. The final size can be adjusted between 1.6 and 0.045 mm, meeting the fineness requirements for rubber filler.
Table 1 shows the technical parameters of the MTW215G model.
| Model | Max. Feed Size (mm) | Final size (mm) | Capacity (t/h) | Main motor (kW) | Fan motor (kW) |
|---|---|---|---|---|---|
| MTW215G | <50 | 1.6-0.045 | 15-45 | 280 | 315 |
With the MTW215G, phosphate rock is fed into the mill and ground between the rollers and ring. The powder classifier ensures precise fineness. The mill is equipped with a pulse dust collector, ensuring a clean working environment.
The LM Vertical Grinding Mill integrates crushing, grinding, powder selection, drying, and material conveying into one machine. It occupies a small area and produces a fine final powder. For phosphate rock grinding at 20-30 tph, the LM190K model is highly recommended. Its capacity ranges from 23 to 68 t/h, which covers the target capacity. The plate diameter is 1900 mm, and the output fineness can be adjusted between 170 and 40 μm (about 80-325 mesh). The maximum feed size is less than 45 mm. The main motor power is 500 kW. This vertical mill is known for its high grinding efficiency and low energy consumption. The material stays in the mill for a short time, reducing repeated grinding and improving product consistency.
Table 2 presents the technical parameters of the LM190K model.
| Model | Plate diameter (mm) | Capacity (t/h) | Output fineness (μm) | Max feed size (mm) | Main motor (kW) |
|---|---|---|---|---|---|
| LM190K | 1900 | 23-68 | 170-40 | <45 | 500 |
The LM vertical mill uses a grinding roller and table to crush and grind the material. Hot air enters the mill to dry the material while grinding. The classifier on top selects the fine powder. The coarse particles fall back to the table for further grinding. This design makes the LM mill particularly suitable for materials with moisture content up to 15%. In Bangladesh, where humidity can be high, this drying capability is a significant advantage.
Both the MTW215G and LM190K can achieve 20-30 tph for phosphate rock grinding. However, they have different strengths. The MTW215G is a traditional trapezium mill with a proven design, lower initial cost, and simpler operation. It is ideal for customers who prefer a classic grinding solution and have limited space. The LM190K, on the other hand, is more advanced, with integrated drying and classifying. It has higher capacity per unit area, lower power consumption per ton, and better environmental performance. The LM mill also produces a more uniform product shape. For a new rubber filler production line in Bangladesh, the LM190K is recommended if the budget allows, as it offers lower long-term operating costs and better adaptability to humid raw materials. If the phosphate rock is dry and the budget is tight, the MTW215G is an excellent alternative.
It is also possible to use a combination of both mills: the MTW215G for coarse grinding and the LM190K for fine grinding, but for 20-30 tph, a single mill is sufficient.
Shanghai Zenith Machinery Co., Ltd. is an excellent manufacturer of ore grinding equipment in China. The company specializes in the research, development, and production of industrial powder grinding equipment. Its products include MTW Trapezium Grinding Mill, Ball Mill, MTM Medium-Speed Grinding Mill, Raymond Mill, LM Vertical Grinding Mill, LUM Ultrafine Vertical Mill, XZM Ultrafine Grinding Mill, and Hammer Mill. With years of experience in the mining and construction industries, Zenith has provided grinding solutions to customers in over 130 countries. In Bangladesh, Zenith has a local service team to ensure quick installation, commissioning, and after-sales support.
Zenith’s mills are CE and ISO certified. The company offers customized solutions based on the specific properties of the phosphate rock and the required rubber filler specifications. From site assessment to equipment selection, installation, and training, Zenith provides full support.
Processing phosphate rock into rubber filler in Bangladesh at 20-30 tph is a viable and profitable project. Selecting the right grinding mill is critical for success. The MTW215G Trapezium Grinding Mill and the LM190K Vertical Grinding Mill from Shanghai Zenith are both excellent choices. They offer reliable performance, high efficiency, and compliance with environmental standards. By choosing Zenith, Bangladesh rubber manufacturers can secure a stable supply of high-quality phosphate rock filler, reduce production costs, and improve product quality. For more information or a customized proposal, please contact Shanghai Zenith Machinery Co., Ltd.
