Patent ID: 8337805
Filing Date: 2012-12-25
Classification: B01J,B82Y,C01G,C01P

Abstract:
1. 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 at 90 to 110° C. for 1 to 3 hours to obtain iron ore leachate; (2) diluting the iron ore leachate with distilled water, separating and discharging residual undissolved powder by centrifuging, removing silica from the iron ore leachate by coprecipitation or polymer adsorption, thereby obtaining a supernatant; (3) adding an oxidant to the supernatant to oxidize all Fe (4) adding the iron hydroxide to an acidic solution to prepare a solution containing Fe (5) adding the mixed iron solution to an alkaline solution, and reacting at 30 to 50° C. for 5 to 20 minutes, to prepare magnetite nanoparticles.