Abstract: In order to provide evidence for the subsequent development and utilization of a magmatic rocks type iron deposits in Hebei province and determine the reasonable mineral processing technology， the process mineralogical characteristics of the ore， such as chemical composition， minerals composition， structure construction， dissemination characteristics， mineral particle size composition， mineral liberation characteristics and occurrence state of useful elements were studied by means of chemical analysis， optical microscope observation， XRD analysis， electron microprobe analysis and MLA (Mineral Liberation Analyser) analysis. The results indicated that the ore is extremely poor vanadium-titanium magnetite of magmatic rocks type， and useful elements are iron and titanium with the content of 21.65% and 5.22%， respectively， followed by phosphorus and vanadium. The major recoverable mineral of magnetite series associated simply with other minerals thus is easy to be liberated and recycled. Only few appear tiny crystals and are encapsulated in the dark minerals or distribute between the gangue mineral， which are difficult to liberated and recycled. The main minerals containing recoverable titanium in ilmenite series are in the form of single particle or aggregate， which is easy to be liberated and recovered. However， minerals in the form of lamellar behaves oppositely and may enter into the iron concentrate. Recoverable phosphorus mineral in apatite series can be recovered after full dissociation. Vanadium is mainly distributed in magnetite in dispersed state， which is difficult to be liberate and can be recovered and utilized together with magnetite.

Key words: Magmatic rock type iron deposits, Minerals composition, Dissemination characteristics, Process mineralogy