Surface Magnetization of Hematite by Metal Ions

Abstract:

In an open hematite pulp with Fe²⁺ or Fe³⁺, Mn²⁺ and Zn²⁺, the surface magnetization of mineral hematite was accomplished by mechanical stirring. The both systems of Fe²⁺ or Fe³⁺, Mn²⁺ and Zn²⁺ magnetized the hematite surface to improve the recovery of hematite by magnetic separation. In the presence of Fe²⁺, the recovery of hematite increased from 69.0% to 85.7% after magnetization when the pulp temperature was 65°C, the concentration of Fe²⁺ 1.8x10^-2mol/L, the concentration of OH^- 0.1mol/L, the stirring speed 400r/min and the reaction time 5min respectively, and the saturation magnetization of hematite also increased from 0.62emu/g to 1.07emu/g, while in the presence of Fe³⁺, Mn²⁺ and Zn²⁺ ions, the saturation magnetization increased to 0.79emu/g. So, the magnetization and the magnetic recovery of hematite in the case of Fe²⁺ is better than that of Fe³⁺, Mn²⁺ and Zn²⁺. The surface magnetization of hematite occurs due to the adsorption of ultra-fine particles with strong magnetism on the hematite surface in the form of aggregates in the case of Fe²⁺ while in the form of flakes in the case of Fe³⁺, Mn²⁺ and Zn²⁺.

• Periodical: Advanced Materials Research (Volumes 785-786)
• Pages: 1104-1110
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.785-786.1104
• Online since: September 2013
• Authors: Xi Qing Wu*, Ping Wei Yang, Zheng Cheng, Liang Dai
• Keywords: Hematite, Magnetic Separation, Magnetization Intensity, Metal Ions, Surface Magnetization

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