FOERFARANDE FOER RENING AV JAERNOXID.

摘要

The invention relates to a process for purifying iron oxide, for example in the form of magnetite ore concentrate or hematite ore concentrate, which contains mainly quartz as an impurity. The process comprises calcining the iron oxide together with alkali metal carbonate, after which leaching-out is performed using a weak aqueous solution of an acid or a mixture of acids.