Abstract: The iron concentrate of magnetic separation of a mining company's concentrator in Wugang City, Henan, has a low iron grade of about 63.5% while high silica content of about 10%. In order to improve the product quality, laboratory tests on several beneficiation processes for this magnetic separation concentrate were carried out. Based on this, pilot test using a process of fine screening, regrinding and low intensity magnetic separation of the oversize fraction of screening was made. As a result, an iron concentrate with a yield of 91.94%, iron grade of 68.20%, SiO₂ content of 3.44% and iron recovery of 97.81% was obtained, attaining the goal of making the concentrate grade above 68%. The test results can be used as the technical basis for the transformation for optimizing the production process of the concentrator.

Key words: Concentrate of magnetic separation, Quality improvement and impurity reduction, Classification by fine screening, Regrinding, Low intensity magnetic separation