DMS technology, or Dense Media Separation is considered by many operators as the de facto standard for diamond recovery. DMS plants offer a small mass pull ( 1 to 2% ) of the head feed with an accurate cut between concentrate and waste material minimizing the presence of gangue material.
DMS feed requires a pre- preparation of the feed material with removal of all fines, to avoid contamination of the dense media used to separate diamonds from lower SG material. Typically a wash plant precedes a DMS to ensure all sand and fine sediment is removed.
Size range of ore to be fed to the DMS will dictate a DMS plant design and the bottom size and top size become important considerations for cyclone selection. A low tph DMS, for example 10 tph, has a typical top size of 15mm and a bottom size of around 0.5mm. If the mine has a need to recover diamonds of 30mm in size, then a more suitable DMS would be a 65 tph DMS with a 510mm diameter cyclone.
Manhattan offers customized DMS plants where lower solids tph are possible with larger diamond recovery.
Unlike XRT, high capacity X-Rays and Jigs, a DMS can receive its full range of feed from bottom size to top size so no pre-classification is necessary.
Recovery efficiency is high with up to 98% recovery on well run plants being sustainable.
Ferro Silicon is required as the dense media with sufficient stock on hand to cover production requirements, as there are inherent losses to the residue circuit.