关键词: 低品位菱铁矿, 磁化焙烧, 磁选, 工艺优化

Abstract: In order to efficiently develop and utilize low-grade siderite resources，the characteristics， beneficiation difficulties and application status of roasting-magnetic separation process of low-grade sider⁃ ite are analyzed. Taking a low-grade siderite ore as the research object，the roasting-magnetic separation process is studied，and the process is compared with single magnetic separation，gravity separation and flo⁃ tation process.The effects of various factors on the grade of iron concentrate and iron recovery rate are ana⁃ lyzed by experiments on siderite at different roasting temperatures，time，atmosphere and magnetic separa⁃ tion conditions.The test results show that under the optimum process conditions determined by the test，the ideal iron concentrate with iron grade of 53.09% and iron recovery of 88.65% is obtained by roasting-mag⁃ netic separation process. Compared with other single processes，the roasting-magnetic separation process has obvious advantages in iron concentrate grade and recovery rate，which can realize the effective enrich⁃ ment of low-grade siderite and provide technical support and theoretical basis for the effective development and utilization of low-grade siderite.

Key words: low-grade siderite ore, magnetization roasting, magnetic separation, process optimization