Method for preparing magnetite nanoparticle from low-grade iron ore and magnetite nanoparticle prepared by the same

摘要

PURPOSE: A method for manufacturing magnetite nano-particles based on lower iron ore and the magnetite nano-particles are provided to reduce silicon components and magnesium components disturbing the formation of magnetite nano-particles and to increase iron components contained in the magnetite nano-particles without the intermediate synthesizing process of iron salt. CONSTITUTION: A method for manufacturing magnetite nano-particles based on lower iron ore and the magnetite nano-particles includes the following: iron ore powder is applied to an acid solution; leachate is obtained by a stirring process at a temperature between 90 and 110 degrees Celsius for 1 to 3 hours; the leachate is diluted with distilled water, and remaining powder is separated; silica components are eliminated from the leachate, and supernatant is obtained; an oxidizer is applied to the supernatant to oxidize ferrous ions into ferric ions; an alkali aqueous solution is applied to the ferric ions to obtain iron hydroxide; the iron hydroxide is applied to an acid solution to obtain ferric ion-containing aqueous solution; a reducing agent is applied to 1/3 of the ferric ion-containing aqueous solution obtain ferrous ion-containing solution; the ferrous ion-containing solution is applied to remaining ferric aqueous solution to obtain iron salt mixed solution; and the iron salt mixed solution is applied to an alkali aqueous solution to obtain magnetite nano-particles through a reaction at a temperature between 30-50 degrees Celsius for 5-20 minutes.