METHOD OF MAGNETIC LIQUID PRODUCTION Russian patent published in 2008 - IPC C02F1/28 C01G49/08 C02F1/72 

FIELD: physics.

SUBSTANCE: invention refers to production of liquid magnetised environments on various bases containing magnetite or ferrite particles and can be used for sealing devices, flaw inspection, control devices, and density separation of nonmagnetic material. Method of magnetic liquid production includes magnetite particles deposition by mixing bivalent iron aqueous solution with hydrogen peroxide alkaline solution, stabilisation and peptisation of processed magnetite particles in dispersion medium. Magnetite particles are deposited in the process of sputtering of bivalent iron solution in hydrogen peroxide alkaline solution, hydrogen peroxide alkaline solution being produced using 5-10% ammonia solution with hydrogen peroxide content of 0.3-0.4 H₂O₂ moles / FeSO₄ moles. Magnetite particles stabilisation and peptisation in dispersion medium is carried out at room temperature, with magnetite particles stabilisation followed by dispersion of stabilised particles in hydrocarbon solvent. After that reaction mixture residual of mother solution decantation is heated up.

EFFECT: production of liquid stable in gradient magnetic field and applicable for density separation of nonmagnetic material.

2 cl, 2 ex