FIELD: process engineering.
SUBSTANCE: invention relates to treatment of siderite ores containing large amounts of magnesium oxide (over 9 wt %) and intended for production of two reconnaissance device with high content of iron and high-purity magnesium oxide. Proposed method comprises crushing and sizing of initial ore, magnetising annealing, dry magnetic separation of annealed product and leaching of magnesium oxide from magnetic fraction by acid solution. Magnetising annealing is carried out in conditions inhibiting oxygen entry at 480-650°C for time interval sufficient for decomposition of iron and magnesium decomposition. After magnetic separation, extracted magnetic fraction is additionally crushed to leach magnesium oxide therefrom by carbonic acid solution and to extract magnesium carbonate on heating to 75-100°C to be decomposed to magnesium oxide at 600-750°C.
EFFECT: higher ecological safety.
3 cl, 2 tbl
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