METHOD OF PRODUCTION OF THE MAGNETIC LIQUID Russian patent published in 2007 - IPC C09G1/04 C01G49/02 H01F1/32 

FIELD: chemical industry; mechanical engineering; etching and galvanic production branches; methods of production of the magnetic liquids.

SUBSTANCE: the invention is pertaining to the field of production of the magnetic liquids from the wastes of the etching and galvanic productions. The invention problem is production of the magnetic liquids on the basis of the water using the waste etching solution of the engineering plants as the source of the bivalent iron and the sediment-waste after purification of the waste waters of the galvanic manufacture by electrocoagulation - as the source for production of the trivalent iron. The problem is settled due to the fact, that the method provides for co-sedimentation of the salts of the bivalent and trivalent iron by the surplus of the ammonia concentrated solution, coating of the surface of the particles with the adsorbed layer of the stabilizing substance - sodium oleate, heating of the suspension and bringing it up to boiling at the constant hashing, centrifuging of the mixture after its cooling for separation of the large- dispersed particles be notable for the fact, that as salts of the bivalent and trivalent iron using the mixture of the waste etching solution of the engineering plants containing FeSO₄ and the muriatic sediment-waste containing Fe(OH)₃ in the ratio of 2:3 after purification of the sewage of the galvanic production by electrocoagulation.

EFFECT: the invention ensures production of the magnetic liquids on the basis of the water using the waste etching solution of the engineering plants as the source of the bivalent iron and the sediment-waste after purification of the waste waters of the galvanic manufacture by electrocoagulation - as the source for production of the trivalent iron.

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