Abstract:  In order to provide theoretical support for the efficient utilization of Qidashan carbonated iron ore， the chemical components， the mineral composition， production form and dissemination characteristics of iron ore were studied in detail. The results show that the iron in the ore mainly occurs in siderite， hematite and magnetite. Main gangue minerals are quartz and dolomite. Magnetite and hematite have a close associated relationship with each other. Most hematite is formed by magnetite oxidation alteration， and hematite has a fine-grained dissemination. Siderite is closely associated with dolomite and quartz， it is mainly composition coarse particles aggregate with self form and semi-self form. Siderite and hematite-magnetite were 92.90% and 15.00% respectively in the grain size above 0.1 mm. The liberation degree of iron ore is more than 60% in particle size below 0.053 mm. The process mineralogy analysis of the ore shows that the ore belongs to refractory iron ore.

Key words: Carbonated iron ore, Mineralogy, Mineral composition, Dissemination characteristics, Size distribution