US 8,940,179 B2 · Method for preparing magnetite nanoparticles from low-grade iron ore using solvent extraction and magnetite nanoparticles prepared by the same

Abstract

The present invention relates to a method for preparing magnetite nanoparticles from low-grade iron ore using solvent extraction and magnetite nanoparticles prepared by the same. According to the method for magnetite nanoparticles from low-grade iron ore of the present invention, it is possible to prepare high-purity magnetite nanoparticles having a purity of 99% or higher by solvent extraction using low-grade iron ore as a starting material, and thus it is possible to reduce the processing cost and the amount of energy used, thus supplying a high-efficiency magnetite nanoparticle adsorbent, which can be industrially applied to wastewater treatment or desalination plant, in large quantities at low cost. In particular, it is possible to effectively treat livestock wastewater, heavy metal wastewater, oil discharged into rivers, etc. at low cost, thus significantly contributing to the prevention of environmental pollution. Moreover, the magnetite nanoparticles prepared by the present invention has a purity of 99.5% and thus can be used as raw materials for high-tech products such as nanoparticle catalysts, magnetic fluids, MRI contrast agents, etc.

Claims12

Dependent claims

A method for preparing magnetite nanoparticles from low-grade iron ore, comprising:

(1) adding iron ore powder to an acidic solution and stirring the mixture to obtain iron ore leachate;
(2) centrifuging the iron ore leachate and separating and discharging residual powder to obtain a supernatant;
(3) adding an oxidant to the supernatant to oxidize all Fe2+ ions to Fe3+ ions, adding a solvent extractant thereto to form an iron-solvent extractant complex, separating the iron-solvent extractant complex from the solution, and adding distilled water to the separated iron-solvent extractant complex to obtain an aqueous solution containing Fe3+ ions;
(4) preparing an aqueous solution containing Fe2+ ions by adding a reducing agent to a volume of one-third to one-half of the aqueous solution containing Fe3+ ions obtained in step (3) such that Fe3+ ions are reduced to Fe2+ ions, and preparing an iron salt mixed solution by adding the aqueous solution containing Fe2+ ions to the remaining aqueous solution containing Fe3+ ions;
and
(5) adding the iron salt mixed solution to an alkaline aqueous solution to prepare magnetite nanoparticles.

3 more elements

Dependencies are inferred from the claim text.

Method for preparing magnetite nanoparticles from low-grade iron ore using solvent extraction and magnetite nanoparticles prepared by the same

Life of this patent

Method for preparing magnetite nanoparticles from low-grade iron ore using solvent extraction and magnetite nanoparticles prepared by the same

Life of this patent

Abstract

Claims12