Managing final concentrate and tailingsIn the eleventh episode of the Mineralogy Matters series, Dr. Chris Greet, Global Minerals Processing Expert, discusses how mineralogy affects both the final concentrate and the tailings. |
An understanding of the mineralogy provides guidance on equipment selection for concentrate dewatering. For example, concentrates containing a high proportion of fine particles—due to the fine grind required to liberate the valuable mineral from the gangue—will require different dewatering equipment than concentrates dominated by coarse particles.
The mineralogy of the concentrate also indicates how easily the material can be processed at the smelter and provides an estimate of any treatment charges that may apply to remove penalty elements.
Similarly, the mineralogy of the tailings provides insight into the design of the tailings storage facility and the ease with which process water can be reclaimed. The mineralogy of both the concentrate and the tailings process streams also influences the quality of reclaimed water. If the ore contains minerals that are soluble in water, the dissolved species can affect flotation performance. For instance, dolomite dissolves in water, releasing calcium and magnesium ions; at an operating pH of around 10, magnesium hydroxide may precipitate on particle surfaces, impeding flotation.
Finally, the mineralogy of the solids in the tailings storage facility provides an indication of potential environmental impacts. Tailings containing high proportions of pyrite or pyrrhotite, if not managed properly, can lead to acid mine drainage.
Key Takeaways – The Impact of Mineralogy on Final Concentrate and Tailings