Abstract:  The relationship between the main geological background and mineral genes of sedimentary metamorphic magnetite is studied. It is considered that the information of mineral composition，structure，mineral distribution characteristics and symbiosis relationship are the intrinsic expression of mineral genes；the mechanical properties，dissociation characteristics and sorting characteristics of ore are the extrinsic expression of mineral genes；and the interactive effects of various geological processes are the main reasons for the great difference in separation of different types of ore or even the same types of ore.Based on the MLA，a super-poor superfine magnetite in Benxi was studied. The relationship between the pre-deposition and post-metamorphism in the formation of this type of sedimentary metamorphic magnetite and the expression of mineral gene in this ore was explained. In view of the mineral genetic characteristics of the ore，a new technology and equip? ment with dissociating controlled grinding by HPGR and precised separation were designed. Compared with the traditional HPGR-wet screening process，the sorting index has obvious advantages. After the new system equipment in 10 million t/a of new projects was successfully up to the standard，achieved considerable economic benefits. Based on mineral genetic characteristics the HPGR dry systematic solution of dissociation control and separation is of great value for the large-scale and low-cost development and utilization of other Anshan sedimentary metamorphic magnetite，and provides a strong technical support for the rational development and utilization of low-grade refractory iron ore resources in China′s iron and steel industry to ensure the domestic supply of iron ore.

Key words: Gene mineral processing, Metasediment, Anshan type magnetite, MLA, High pressure roller, Magnetic grading dry separator, Middling circulation dissociation