Experimental Study on Benefication of Silicate-type Iron Ore in Yunnan

As the ever-increasing shrinking of rich ore resource,the importance of utilizing lean ore becomes more and more significant. A typical silicate-type low grade iron ore from Yunnan province was taken for beneficiation study in this paper. Detailed process mineralogy research and mineral processing experiments have been carried out,which included low intensity magnetic separation for raw ore,and high intensity magnetic separation,shaking table separation and reduction roasting-low intensity magnetic separation for the tailing of low intensity magnetic separation for raw ore. As a result,the benefication process of extracting magnetite from raw ore by low intensity magnetic separation and scavanging limonite or hematite by reducing roasting-low intensity magnetic separation was adopted. Through the two-step magnetic separation,the concentrate with iron content of 60. 07% and iron recovery of 74. 35% was obtained.