Abstract: A low-grade iron tin ore in Myanmar contains iron of 29. 79% and tin of 0. 495%,and the gangue composition is mainly SiO2. The main valuable minerals are magnetite and cassite,which are closely symbiosis,and the grain size is fine. In order to determine the efficient development and utilization process of the ore,based on the study of raw ore properties,the process flow of wet low-intensity magnetic separation (LIMS) for iron selection,cassiterite recovery (shaking table gravity separation (STGS),high gradient magnetic separation (HGMS) after middle ore regrinding for iron removal and STGS),flotation desulphurization,magnetic separation for iron removal with tin comprehensive roughing concentrate(LIMS+HGMS) process was obtained for beneficiation experimental research. The results showed that the whole process closed-circuit test finally obtained tin concentrate with a tin grade of 57. 956% and recovery rate of 69. 08%,iron concentrate with an iron grade of 65. 21% and recovery rate of 48. 22%,sulfur concentrate with sulfur grade of 46. 35% and recovery rate of 38. 31%. The impurities contained in three kinds of concentrate products,such as iron,tin and sulfur,are not exceeded,and the tin grade of the total tailings is reduced to 0. 153%,which realizes the comprehensive recovery and utilization of iron tin ore resources.

Key words: refractory iron-tin ore,low-intensity magnetic separation,high gradient magnetic separation,shaker reselection, regrinding and reselection