MMIJ Annual Meeting

In this study, an in-depth investigation of flotation processing technology for the extraction of cobalt from mine tailings is examined. A variety of parameters including pulp density, stirring speed, aeration, pH and reagent type and dosage was carried out. The research utilizes three distinct types of tailing feed, sourced from Australian mining operation and tailing dams. The mineralogical analysis carried out by MLA reveals that cobalt is primarily hosted in either pyrite or cobaltite, with these minerals presenting as fine particles. Given these findings, a novel carrier flotation technology is introduced to enhance the flotation of fine cobalt particles. Preliminary tests using this small-large size particle attachment technology indicate that recovery of cobalt increased to more than 70% albeit a decline in grade. Conversely, the investigation of flotation parameters suggests that cobalt recovery of more than 65% is achievable, with a slightly higher grade than that observed with carrier flotation. This paper provides valuable insights into the optimization of cobalt extraction from tailings, contributing to a step towards the diversification of cobalt supply sources for a carbon-neutral society.