LIU Chao, HONG Qiu-yang^*, CHEN Zhi-qiang, LIU Yong, LIU Mu-dan, LYU Hao-zi

(Guangdong Institute of Resource Comprehensive Utilization, State Key Laboratory of Rare Metals Separation and Comprehensive Utilization Guangzhou, Guangdong Province key Laboratory of Mineral Resource and Comprehensive Utilization, Guangzhou 510650, China）

Abstract: Multiple analytical techniques, including mineral liberation analyzer (MLA), energy dispersive spectrometer (EDS) of scanning electron microscope, and X-ray fluorescence spectrometer (Axiosm AX), and optical microscope (OM) have been used to systematically study the process mineralogy of deeply oxidized ores from an oversea V-Ti iron deposit in this paper. The results show that the ore which is deeply oxidized contains a series of minerals from primary to oxidized zones; The iron minerals, in which vanadium is mainly contained, include dominant hematite, and minor magnetite and maghemite. The titanium minerals are mainly ilmenite and altered ilmenite. Iron minerals and titanium minerals are closely embedded in each other, thus they are hardly liberated by the grinding of ores. The magnetic separation recovery process test for recovering Fe, V2O5 and TiO2 from ores were conducted on the basis of the study of process mineralogy. The V-bearing iron concentrate recovered from ores by using the weak magnetic separation process has Fe, V2O5, and TiO2 grades of 60.28%, 1.06%, and 9.85%, respectively, with the recovery rates of 7.98% for Fe, 8.32% for V2O5, 4.05% for TiO2, respectively.. Meanwhile, the Ti-Fe concentrate recovered from tailings of the weak magnetic separation process by using the strong magnetic separation process has Fe grade of 49.42%, V2O5 grade of 0.82%, and TiO2 grade of 16.46%, respectively, with the recovery rates of 78.52% for Fe, 77.23% for V2O5 , and 81.19% for TiO2, respectively. This Ti-Fe concentrate could be used as crude material for the further extraction of vanadium, titanium, and iron.

Keywords: V-Ti iron ore; deeply altered and oxidized; process mineralogy; Magnetic separation for recovering

ACTA MINERALOGICA SINICA Vol. 41, No.3, 2021, page 277-286