Tanzania’s plastics industry is expanding rapidly, driven by urbanization, packaging needs, and infrastructure development. One key raw material for producing high-quality plastic filler is dolomite powder. Dolomite, a calcium magnesium carbonate mineral, is widely used as a functional filler in plastics to improve rigidity, heat resistance, and opacity while reducing production costs. To meet this demand, local processors require reliable, energy-efficient grinding mills capable of producing fine dolomite powder with a capacity of 1 to 3 tons per hour (tph). Shanghai Zenith Machinery Co., Ltd., a leading manufacturer of ore grinding equipment in China, offers a range of advanced mills perfectly suited for this application. This article explores the technical considerations for dolomite grinding in Tanzania and recommends two proven solutions from Zenith.
Plastic fillers enhance mechanical properties and reduce the amount of expensive resin needed. Dolomite powder offers several advantages: it is chemically inert, has high brightness, and provides excellent dispersion. In Tanzania, locally sourced dolomite is abundant, making it a cost-effective choice for manufacturers of PVC pipes, profiles, masterbatch, and other plastic products. The target fineness for plastic filler is typically 325 mesh (44 microns) to 800 mesh (18 microns), with a capacity of 1–3 tph for small-to-medium scale operations.
Dolomite has a Mohs hardness of 3.5–4, making it moderately hard. However, its brittle nature can cause excessive wear on grinding components if the mill is not designed properly. Additionally, moisture content (usually below 6%) and feed size (up to 30 mm) must be controlled to maintain stable operation and product quality. For Tanzanian processors, reliable after-sales service, spare parts availability, and energy efficiency are critical factors. Zenith’s mills address these challenges with robust construction, patented technologies, and a global service network.
Based on Zenith’s product portfolio and the target capacity range, two mills stand out: the MTW110 Trapezium Grinding Mill and the MTM100 Medium-Speed Grinding Mill. Both are engineered for fine powder production, offer easy maintenance, and can achieve the desired fineness for plastic filler.
The MTW series is a flagship product with multiple patents. Its trapezium-shaped roller and ring design improve grinding efficiency by 30% compared to traditional Raymond mills. The MTW110 model is ideal for capacities between 3–9 t/h (easily covering the 1–3 tph requirement at lower throughput settings). It accommodates feed sizes up to 30 mm and produces final fineness from 1.6 mm down to 0.045 mm (325 mesh). The mill features a compact structure, low noise, and a dust-free operation, making it suitable for environmentally conscious plants in Tanzania.
The MTM100 is a medium-speed mill that adopts world-leading powder processing technology. With a ring roll count of 4 and a capacity of 3–8 t/h, it is an excellent choice for 1–3 tph dolomite grinding. Its main motor power is only 37 kW, offering excellent energy efficiency. The MTM100 can produce fineness down to 0.045 mm (325 mesh) and is designed for easy replacement of wear parts. It is an ideal upgrade from traditional Raymond mills, with higher output and lower maintenance costs.
| Parameter | MTW110 Trapezium Mill | MTM100 Medium-Speed Mill |
|---|---|---|
| Max Feed Size (mm) | <30 | <25 |
| Final Product Size (mm) | 1.6 – 0.045 | 1.6 – 0.045 |
| Capacity (t/h) | 3 – 9 | 3 – 8 |
| Main Motor Power (kW) | 55 | 37 |
| Fan Motor Power (kW) | 55 | N/A (integrated) |
| Ring Roll Number (pcs) | 4 (trapezium) | 4 |
| Application for Dolomite | Excellent for fine powder (325 mesh) | Ideal for medium-fine (325 mesh) |
A typical grinding plant for plastic filler includes a jaw crusher for primary crushing, a bucket elevator, a vibrating feeder, the grinding mill, a classifier, a cyclone collector, and a bag filter. Dolomite blocks are first crushed to below 30 mm, then fed into the MTW110 or MTM100 mill. The ground powder is classified by the internal classifier: oversized particles return to the grinding chamber, while fine powder is collected by the cyclone and bag filter. The final product is stored in a silo and packed for shipment to plastic factories. Zenith offers complete turnkey solutions, including design, installation, and commissioning.
Shanghai Zenith Machinery has decades of experience in the ore grinding field. Our mills are exported to over 170 countries, including Tanzania, where we have established strong partnerships. Key benefits include:
In a neighboring East African country, a plastic masterbatch manufacturer installed an MTM100 mill to produce 2 tph of dolomite powder (325 mesh, 99% passing). After 18 months of operation, the mill maintained stable performance with minimal wear. The customer reported a 15% reduction in electricity cost per ton compared to their previous Raymond mill, and the product quality met international standards for plastic filler. This success underscores the reliability of Zenith’s technology for Tanzanian applications.
For plastic filler producers in Tanzania who require a capacity of 1 to 3 tons per hour, the MTW110 Trapezium Grinding Mill and MTM100 Medium-Speed Grinding Mill from Shanghai Zenith Machinery offer the perfect balance of efficiency, durability, and cost-effectiveness. With their compact design, fine powder output, and proven track record, these mills will help Tanzanian manufacturers reduce production costs and improve product quality. Contact Zenith today for a customized proposal and take your dolomite processing to the next level.
