Heavy Media Separation (aka HMS or DMS) & X Ray Transmission (aka XRT) are both effective ore sorting technologies, but they have distinct advantages, depending on the application.
The Benefits of Heavy Media Separation
Cost Effectiveness
HMS can be more cost effective for certain types of ores, especially when dealing with large volumes of material. HMS is more economical as the volume of the material increases, as XRT is still a way off being a bulk sorting tool. The HMS process uses a heavy medium to separate minerals based on their density, which can also be less expensive than the hi-tec equipment required for XRT.
Simplicity
HMS is a relatively straightforward process that doesn’t require sophisticated sensors and software needed for XRT. This simplicity can translate to lower setup costs in addition to cheaper maintenance and operational costs.
Proven technology
HMS has been used in the mining industry for many years and is a well understood and reliable method of ore sorting. Its long history of use means that there is a wealth of knowledge and experience available for optimising the process. The different grades of the heavy medium used can target the specific cutting density, usually within a range of 2.4-3.8g/cm³. Milled Ferro Silicon grades typically 2.4-3g/cm³ and Atomised Ferro Silicon typically 2.9-3.8g/cm³. We can advise on the most suitable grade to achieve precise cutting densities within those ranges.
Efficiency with Certain Ores
For coarser or denser ores that have a significant density difference between the valuable minerals and the waste rock, HMS is highly efficient.
That said, XRT can provide more precise separation, where the densities of the materials to be separated have a narrower bandwidth and on finer materials. (-6mm etc)
Conclusion
It should be noted that both process methods continue to develop and are becoming more efficient. Both are contemporary processes selected based on their suitability for each project.
HMS is usually selected when a new start needs to quickly establish a high volume of throughput of a higher density, coarser ore, and is as relevant today as it ever has been.
Westbrook Resources Ltd’s forte is assisting new mining projects (or non-ferrous scrap recycling) get established. Using our many decades of technical experience, we work with customers to find solutions including finding the most suitable grades, the use of consignment stocks, payment terms, managing price fluctuations and accurate logistics forecasting. In addition, we can offer Carbon offsetting where appropriate.
Contact us today for more information.
Mark Allsop, September 2024