关键词: 赤铁矿, 磁化焙烧, 弱磁选

Abstract: The iron grade of iron ores in Hainan Shilu is 40.21%，and the content of sulfur of the main harmful ingredient is 1.32%. The iron mainly exists in the form of hematite，and the iron distribution rate is 73.56%. Beneficiation tests were carried out to determine the rational development and utilization process of the ore. The results showed that the samples were treated by preconcentration，magnetization roasting and low intensity magnetic separation when the grinding fineness of - 0.074 mm accounts for 62.18%. The ore was desulfurized by the reverse flotation process of one roughing，one cleaning，one scav⁃ enging and middling return in sequence，and then enriched by one medium magnetic separation and one high intensity magnetic separation. The amount of ore entering the magnetic roasting and low intensity mag⁃ netic separation process is reduced by 16.50%，and the preconcentration concentrate with iron grade of 45.61% and sulfur content of 0.54% was achieved. The iron concentrate with iron grade of 66.86% and re⁃ covery rate of 92.27% was obtained under the conditions of reduction temperature of 520 ℃，reducing agent concentration of 30%，reduction time of 20 min and feeding fineness of low intensity magnetic separa⁃ tion of -0.038 mm accounting for 90%.

Key words: hematite, magnetization roasting, low intensity magnetic separation