关键词: 膏相铁尾砂, 磁化焙烧, 红矿回收, 石膏基建材, 固废综合利用

Abstract: In order to comprehensively utilize the tailings resources of iron mine，aiming at the prob⁃ lem that the tailings with low silicon，high iron and high gypsum content in Luohe Iron Mine should not be directly used as fine aggregate in building materials，through the analysis of the physical and chemical characteristics of tailings，and according to the building materials industry standard，the technology re⁃ search and exploration test of using gypsum iron tailings as the main raw material to extend and process gyp⁃ sum based dry powder mortar were carried out. The complete process technology of tailings-pipeline trans⁃ portation-ceramic filtration dehydration-heat drying-anhydrite medium temperature flash burning and red ore magnetization roasting integration-high pressure roller mill grinding-mixing-sedimentation-intelligent packaging was obtained. The gypsum based dry powder mortar sample produced by semi-industrial test has passed the test and identification of building materials industry，and can recover high quality magnetite concentrate with yield of 8.57% from tailings. The market capacity of gypsum-based ecological building ma⁃ terials prepared by gypsum-phase iron tailings is huge，and the comprehensive utilization of mine solid waste has broad prospects.

Key words: gypsum iron tailings, magnetized roasting, red ore recovery, gypsum basic building materi? als, comprehensive utilization of solid waste