关键词: 萤石矿, 预先除砷, 浮选工艺, 伴生金回收, 药剂制度

Abstract: For a low-grade fluorite ore from Jiangxi，the raw ore contains 23.13% CaF₂，0.057 g/t Au，and 65.7 g/t As. Arsenic minerals tend to float along with sulfides during flotation，severely affecting the quality of the fluorite concentrate. Meanwhile，the associated gold resources possess comprehensive re⁃ covery value. To achieve fluorite purification，arsenic reduction to meet standards，and comprehensive uti⁃ lization of associated gold，exploratory tests on grinding fineness，optimization of the reagent scheme，and full-circuit closed flotation experiments were conducted. The results show that under a grinding fineness of 50% passing 0.075 mm，using a pre-arsenic removal flotation process consisting of one roughing，four cleaning，and one scavenging stages，an arsenic flotation concentrate with an Au grade of 5.05 g/t was ob⁃ tained，with only a 0.01% loss in CaF₂ recovery. Closed-circuit flotation tests on the pre-arsenic removal tailings，comprising one roughing，six cleaning，and one scavenging stages for fluorite，ultimately yielded a fluorite concentrate with a CaF₂ grade of 97.35% and a recovery rate of 90.54%. The As content was re⁃ duced to 2.56 g/t，meeting the industrial application standards for fluorite concentrate. The research find⁃ ings provide technical reference for the industrial production of similar types of low-grade fluorite ores.

Key words: fluorite ore, pre-arsenic removal, flotation process, associated gold recovery, reagent re? gime