Abstract: This paper studies on refining iron and reducing impurity of some other metallic minerals suchas magnetite, hematite, limonite and goethite in an iron ore in Thailand. The combined process ofgrinding-weak magnetic separation-high intensiy magnetic separation” can be adopted for the medium.5 mm particle size of the original ore. The final iron concentrate yield is 73. 59% , the iron grade is56.77% ，and the recovery is 81.31%

Key words: magnetite, combined process, grade, recoveryrate