METHOD OF SUSPENSION PREPARATION FOR MINERAL RESOURCES SEPARATION BY DENSITY IN INHOMOGENEOUS MAGNETIC FIELD Russian patent published in 1997 - IPC

FIELD: suspensions production for mineral resources separation by benefication methods, in particular for gold separation from placers slick concentrate. SUBSTANCE: method to prepare suspension for mineral resources separation by density in inhomogeneous magnetic field provides addition of alkali to water solution of bivalent and trivalent iron salts to form ferromagnetic particles, that are settled, stabilized by introduction of surface-active substances and are dispersed in kerosene medium. Solution of bivalent and trivalent iron salts is prepared by dissolving of magnetite particles separated as by--product from itching solutions or at first stage of placers slick concentrates separation in hydrochloric acid with concentration of no less than 20 % under temperature 50 - 85 C. As surface-active substances fatty acids they use separated during alkaline hydrolysis technical vegetable oils or synthetic or natural naphthene acids, or synthetic fatty acids of different structure, or olein acid taken as individual surface-active substance of as mixture of above substances. Rape oil or coriander oil is used as technical vegetable oil. EFFECT: increased output. 2 cl, 1 tbl