Process for the production of iron oxide fine powder

摘要

A process for producing iron oxide fine powder of high purity from an oxide iron ore such as hematite or magnetite by only physical processing is disclosed, which comprises the steps of: providing a preliminarily ground raw material powder of an oxide iron ore or a mixture thereof having the impurity content in a specific range; classifying the raw material iron ore powder under such conditions that fine particles smaller than 10 mu m in diameter are removed from the ore powder; optionally treating the classified powder with an acid solution; refining the classified, optionally acid-treated iron ore powder by means of gravity concentration; and finish grinding the refined powder to reduce the particle size to a desired level.