RecyCoal management has developed the Dual Density Natural Medium (DDNM) process.

RecyCoal has developed, operated and proved its own highly efficient hybrid Dual Density Natural Medium (DDNM) process.

The system removes coal from variable feed contaminated with high proportions of dirt and clay. This is achieved by constantly changing the natural medium density and is well suited to recover coal from difficult materials such as:

• Re-processing old derelict colliery spoil tips
• Heat affected coal
• Rejects from dense medium processes
• Run-of mine (ROM) feed direct from the mine, both underground and open cut
• Clay contaminated coal seams
• Top of seam coal cleanings and remnant floor coal from seam interfaces

Unlike other systems, the RecyCoal DDNM process does not use an additive such as magnetite in the liquid circuit to form density. Instead, it uses the fine dirt, shale and clay within the feed to achieve the medium.

In the normal operation of the system the mixing of the feed with water results in fine particles within the feed going into suspension creating a suitable medium to facilitate coal recovery. The separation process includes three stages utilising a primary separator and a two stage natural medium cyclone system working on two different densities.

RecyCoal has designed and installed DDNM systems to process tonnages ranging from 300 tph up to 2000 tph and coal yields ranging from as low as 4% to over 60%.

Please click on the flow diagram to enlarge!