METHOD OF PREPARING MAGNETIC LIQUID Russian patent published in 2010 - IPC H01F1/28 H01F1/44 

FIELD: chemistry.

SUBSTANCE: invention relates to preparation of magnetic liquids. The method involves mixing solutions containing tri- and bivalent iron in ratio Fe³⁺/Fe²⁺ = 3:2, precipitation of magnetic particles by adding 28% ammonium hydroxide to the mixture of solutions, coating the precipitated magnetic particles in the aqueous medium with a stabilising substance which forms a soluble ammonium salt in excess ammonium hydroxide, heating the suspension of magnetic particles to convert the stabilising substance, separation of the aqueous phase and addition of a non-aqueous liquid carrier, having limited solubility relative the stabilising substance. The source of trivalent iron used is wastes from purifying flue gas on a metallurgical plant, and the source of bivalent iron is iron sulphate - wastes from production of titanium white using sulphuric acid.

EFFECT: method enables to obtain magnetic liquids with good magnetic properties using wastes from metallurgical production and wastes from production of titanium white.

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