Abstract：The determination of magnetic iron content is one of basic analysis items in iron ore prospecting. In the past, the magnetic iron is usually separated by manual magnetic separation method followed by determination. However, this method has some disadvantages, for example, the cleaning is incomplete or the water velocity is hardly controlled to cause loss of magnetic iron. Moreover, the specification of permanent magnets used in different laboratories is not unified, which also cause the bad repeatability of determination results. The magnetic iron separation apparatus was self-designed in experiments, which was composed of three parts, i.e., frame, transmission and elution system. It not only improved the separation efficiency, but also realized the simultaneous operation of several samples by one person. The single factor and orthogonal experiments for magnetic iron separation conditions using this apparatus were investigated, and it was applied for the determination of magnetic iron content in iron ores. The results showed that the optimum conditions of this apparatus for the magnetic iron separation were as follows: the magnetic field intensity was 80Gs, the water velocity was 30mL/min, the overturn speed was 70r/min, and the elution time was 3min. The content of magnetic iron in sample had little influence on the determination results. The proposed method was applied for the determination of magnetic iron content in certified reference material for composition analysis of phases in iron ores. The relative standard deviations (RSD, n=8) of determination results were 0.80% and 1.0%. Two actual iron ore samples were determined according to the experimental method, and the found results were basically consistent with those obtained by standard method YS/T 1047-2015.
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