Abstract: Separation process condition test on deep reduction clinker was conducted，in order to determine high effective separation process to deal with the deep reduction products from a fine refractory hematite.Through condition experiments by using basal process from exploratory tests.Optimal grinding fineness and magnetic separation process was obtained，stage grinding-stage separation process can used to deal with the deep reduction products from a fine refractory hematite.High quality deep reduction iron powder products with iron grade and recovery higher than 87% was achieved by dealing with reduction clinker of iron grade 57.09% at conditions of first stage grinding fineness of 11% passing 0.074 mm，second stage grinding fineness of 77%~93% passing 0.074 mm，magnetic field intensity for magnetic separation column concentration of 7.3 kA/m,water flow rate at 70 mL/s.The research provides theoretical and practice basis for industrial application of deep reduction-high efficiency separation.

Key words: Hematite, Deep reduction, Technological process, Grinding fineness, Magnetic field intensity