FIELD: chemistry.
SUBSTANCE: invention relates to field of chemistry. Magnesium oxide is obtained by milling of initial raw material - brucite. Mother liquor is added into milled raw material, after which it is leached by nitric acid with addition of barite. Nitrate pulp is neutralised by dust of electrofilters. Sediment is separated by filtering and washed with obtaining washing waters, directed to stage of leaching. Filtrate, formed after sediment separation, is cooled to temperature of crystallisation of magnesium nitrate hexahydrate, crystals of magnesium nitrate hexahydrate are separated from mother liquor, which is directed into evaporator for separation of calcium and obtaining fertilisers. Crystals of magnesium nitrate hexahydrate are subjected to thermal hydrolysis by superheated vapour of water with obtaining magnesium oxide and vapour-nitrous gases, directed into absorber for regeneration of nitric acid. Obtained nitric acid is directed to leaching of initial raw material.
EFFECT: invention makes it possible to increase quality of product and reduce its loss.
10 cl, 1 dwg, 2 ex
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