Method for preparing magnetic iron oxide

摘要

A method for preparing magnetic iron oxide Fe21.333O32, comprising the following steps: (1) preparing a ferrous salt solution with solid soluble ferrous salt; (2) preparing a hydroxide solution; (3) mixing said hydroxide solution and said ferrous salt solution in a co-current manner for reaction at an alkali ratio of 0.6-0.8 and a reaction temperature not exceeding 30° C.; (4) after the reaction in step (3) is finished, yielding a first mixture, then charging said first mixture with a gas containing oxygen for oxidation, and controlling the first mixture at a pH value of 6-8 until the oxidation is finished to yield a second mixture; (5) filtering, washing with water and drying said second mixture obtained in step (4) to yield a precursor; and (6) calcining the precursor obtained in step (5) at 250-400° C.

主权项

1. A method for preparing magnetic iron oxide Fe21.333 O32, comprising the following steps:
(1) preparing a ferrous salt solution with solid soluble ferrous salt; (2) preparing a hydroxide solution; (3) mixing said hydroxide solution and said ferrous salt solution in a co-current manner for reaction, controlling said hydroxide solution and said ferrous salt solution at an alkali ratio of 0.6-0.8, controlling said ferrous salt solution at a feeding speed of 200-300 ml/min, and said hydroxide solution at a feeding speed of 50-60 ml/min, and controlling the reaction temperature not exceeding 30° C.; (4) after the reaction in step (3) is finished, yielding a first mixture, charging the first mixture with a gas containing oxygen for oxidation, and controlling the first mixture at a pH value of 6-8 until the oxidation is finished to yield a second mixture; (5) filtering, washing with water and drying said second mixture to yield a precursor; and (6) calcining the precursor obtained in step (5) at 250-400° C.