Resource-Saving Technology for Nepheline Concentrate Production from High-Silica Raw Material
V. V. Marchevskaya, T. N. Mukhina
Mining Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
Keywords: Alumina, nepheline-bearing rocks, slimes, magnetic separation, flotation, nepheline concentrate, magnetic flotation technology
Abstract
The article describes the lab-scale tests aimed at development of an efficient technology for nepheline concentrate production from high-silica nepheline-bearing raw material to be a non-bauxite import-substituting feedstock for the aluminum industry in Russia and in the other countries with limited or totally unavailable high-quality bauxite reserves. The improved process flowchart ensures production of nepheline concentrate which satisfies requirements of subsequent processing by sintering with lime and contains not less than 26.4% of alumina and not more than 2.3% of total iron, with alumina recovery of not less than 90% at the silica modulus of 0.6 and alkali modulus of 0.5.
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