| 摘要 |
FIELD: physics. ^ SUBSTANCE: method of preparing magnetic liquid involves formation of a suspension of magnetite nanoparticles, coating the surface of magnetite nanoparticles with an adsorbed layer of oleinic acid as a stabilising substance. The suspension of magnetite nanoparticles is then heated with the adsorbed layer of stabilising substance. A fraction containing the stabilised magnetite particles is separated from the suspension in kerosene as carrier liquid. The source of bi- or trivalent iron for obtaining the suspension of magnetite nanoparticles used is natural magnetite - wastes from Olenogorsk mining and concentration complex having the following chemical composition: Fetotal=65.6%, FeO=26.7%, Fe2O3=63.4, MnOmax=0.11%, CaOmax=0.60%, MgOmax=0.8%, Al2O3max=0.40%, Smax= 0.15%, P2O5max=0.025%, SiO2max=7.75%, Na2Omax=0.063%, K2Omax=0.063%. Natural magnetite is preliminarily dissolved in hydrochloric acid and re-precipitated with 28% ammonium hydroxide. ^ EFFECT: obtaining cheaper magnetic liquid and wider area of using the said liquid. ^ 2 tbl, 5 ex |
