Geometallurgical Modeling of Complex Fe-Ti-V-Mn Oxide Mineralization: A Processing Strategy for the Gambella-Dembidollo Deposit, Western Ethiopia

A groundbreaking geometallurgical reevaluation of a complex Iron-Titanium-Vanadium-Manganese (Fe-Ti-V-Mn) oxide mineralization located in the Gambella-Dembidollo region of Western Ethiopia has been carried out through this research. The research is substantiated by comprehensive archival mineralogical and geochemical data from a primary technical work done by Stern Lapajne (1985). The principal mineral resource assemblage which consists of iron (Fe₂O₃), iron (Fe₃O₄), and titanium (FeTiO₃) has a close relationship with manganese (Mn₃O₄) that is very difficult to process and that was the major reason of its earlier classification as sub-economic. This research presents four geometallurgical constraints that stem from the mineralogy: (1) the fine-grained, solid-solution texture of ilmenite within haematite, which makes titanium liberation difficult; (2) the complete incorporation of vanadium within the magnetite crystal lattice, hence its recovery being dependent on magnetic separation efficiency; (3) the complicated association of the manganese-rich phase (hausmannite) with the iron oxide fraction; and (4) the overall low grade of the mineral deposit, which necessitates the implementation of an efficient pre-concentration scheme to secure the project’s economic feasibility. A predictive processing flowsheet is built upon these constraining factors, along with a multi-stage recovery process. The process starts with Low-Intensity Magnetic Separation (LIMS) to capture the V-bearing magnetite, and then the non-magnetic fraction is subject to an intensive liberation step with ultrafine grinding. The next step is to use High-Intensity Magnetic Separation (HIMS) or differential flotation to get ready-to-sell ilmenite and hausmannite concentrates. The analysis done in the study brings to light that despite the deposit being intermittent and complex in mineralogy, such a geometallurgy-enabled, sequential recovery process could make the metal yield of multiple elements the highest possible. The research presents a useful model for evaluation of such complicated oxide systems worldwide, and it clearly shows that the combination of mineralogical and process analysis can be a powerful tool in making a profit out of difficult mineral resources.