Stage grinding--magnetic separation--flotation combined beneficiation processing technology for a complex refractory iron ore.

Taking a complex and difficult-to-process iron ore from western Yunnan as the research object, X-ray fluorescence spectroscopy (XRF), chemical multi-element analysis, X-ray diffraction (XRD) and other methods were used to analyze the ore. The results show that the most valuable metal element in the ore is iron, which is mainly present in the form of magnetite. The sulfide minerals primarily include magnetite, pyrite and sphalerite, and the gangue minerals mainly include serpentine and talc. Based on the ore properties of the mine, a combined beneficiation process involving stage grinding and separation, magnetic separation, and flotation desulfurization was adopted to process the iron ore. By studying the effect of process parameters such as magnetic field strength, grinding fineness, types of activators, collectors and foaming agents on the quality improvement of iron ore by magnetic separation and flotation desulfurization, the optimal process parameters were obtained and closed-circuit tests were carried out according to the obtained best process conditions. Finally, a sulfur concentrate with an S grade of 21.90% and an S recovery rate of 68.52%, as well as an iron concentrate with a TFe grade of 61.56%, a TFe recovery rate of 67. 41%, and an S content of 0.67%, were obtained. The results could provide support for the efficient utilization of the iron ore resources. [ABSTRACT FROM AUTHOR]