Abstract:
The refractory amphibole type magnetite in Yuanjiacun iron ore deposit has the characteristics of high content of iron-bearing silicate, complex mineral composition, and extremely fine dissemination sizes. Based on process mineralogy study, the purpose of reducing the cost of grinding was achieved through the process of preconcentration (early loss) and reverse flotation or elutriation magnetic separation of the low intensity magnetic separation (LIMS) concentrate to obtain most of the high-grade iron concentrate under relatively coarse grain conditions. Finally, the ore dressing process suitable for amphibole type magnetite ore in yuanjiacun was developed, which contained a wet preconcentration of -3 mm grains, two stages of grinding, four times of low intensity magnetic separation, a reverse flotation, and a regrinding of flotation tailings with the LIMS. With this process, an iron concentrate with a yield of 29.42%, a TFe grade of 68.18%, and a TFe recovery of 66.55% could be obtained. This study solves the problem of the economic exploitation and utilization of the amphibole type magnetite ore in Yuanjiacun.