Abstract: Miaogou iron ore has complex properties and extremely fine dissemination size. Its original beneficiation process was long and consumed large amount of energy, with the iron concentrate containing 60%~63% iron and as high as 8.75% SiO₂. A full magnetic separation process with equipment such as magnetic field screen, elutriating machine for cleaning and high frequency vibration mesh screen was adopted to transform the original process, which achieved an iron concentrate having an iron grade as high as above 65.00% and a reduced SiO₂ content of 6.83%. As a result, the objective of iron increase and silica reduction was achieved, improving the comprehensive economic benefit of the concentrator.

Key words: Iron ore, Iron increase and silica reduction, Process transformation