Dense Media Separation
Magnetite Solutions for Coal Preparation
Dense Media Separation (DMS), also known as Heavy Medium Separation (HMS), is the most efficient gravity separation technology in modern coal preparation plants. UMI’s core technical focus is DMS, and it is the foundation of our long-term partnerships with some of the industry’s most respected coal processors.
What Is Dense Media Separation?
In a DMS circuit, magnetite suspension is maintained at a controlled density in cyclones or heavy-media baths; clean coal floats while rock, shale, and pyrite sink, delivering superior ash reduction and higher calorific value at high throughput. Medium stability, rheology, and rapid magnetic recovery are critical, and that’s where UMI’s specialized expertise makes the difference.
Why Magnetite Is the Industry Standard
Magnetite (Fe₃O₄) remains the only economically viable dense-medium material, combining high specific gravity, ferrimagnetic properties, and chemical inertness. Properly sized and cleaned, it forms stable, low-viscosity suspensions that are easily recovered with magnetic separators, minimizing medium losses.
UMI’s Optimized Magnetite for DMS
We supply two industry-proven grades specifically engineered for coal-preparation circuits:
83 Grade Magnetite
- Ideal for plants requiring tight density control and maximum recovery
- Optimized particle-size distribution for superior suspension stability
- Excellent low-viscosity rheology even at higher solids concentrations
- Minimal contaminants for cleaner coal and reduced fouling
80 Grade Magnetite
- Proven performer in standard DMS cyclones and baths
- Slightly broader PSD for plants with variable feed characteristics
- Outstanding magnetic recoverability and cost-effectiveness
- Trusted choice for both metallurgical and thermal coal operations
Reach Out
Contact UMI Today
Whether supporting your current operations, upcoming projects, or specific material needs, UMI is ready to help.
Contact us today to discuss your requirements or arrange a technical consultation.