四川某稀土尾矿综合回收利用的选矿试验研究

四川某稀土尾矿中含萤石27.58%,重晶石45.25%,氟碳铈矿1.25%,由于长期堆存,其综合回收利用难度大。试验通过磨矿—萤石浮选—萤石精矿磁选分离稀土—萤石尾矿重选回收重晶石的选矿流程,可综合回收利用萤石、重晶石及稀土矿物。试验结果表明,以YS-1#为萤石捕收剂,EM326为重晶石抑制剂,通过一次粗选、一次扫选、六次精选的浮选流程,可获得萤石精矿品位大于95%的指标,对浮选萤石精矿进一步强磁分离稀土矿物,可获得萤石精矿CaF2品位97.63%、回收率73.57%、稀土精矿REO品位38.57%、回收率45.27%的指标;萤石浮选尾矿通过分级—重选流程可获得重晶石精矿BaSO4品位90.35%,BaSO4回收率75.48%的指标。

Study on Beneficiation Test of Comprehensive Recovery and Utilization of a Rare Earth Tailings in Sichuan ProvinceYAN Weiping1,2 ZENG Xiaobo1,2 YANG Yaohui1,2

A rare earth tailings in Sichuan contains 27.58% fluorite, 45.25% barite and 1.25% cerium fluoride. Due to long-term stockpiling, it is difficult to recover and utilize. Through grinding-fluorite flotation-fluorite concentrate magnetic separation rare earth-fluorite tailings gravity separation recovery barite beneficiation process, can be comprehensive recovery and utilization of fluorite, barite and rare earth minerals. The results show that YS-1 is used as fluorite collector, EM326 is used as barite depressant, and the grade of fluorite concentrate is more than 95% through the flotation process of one roughing, one sweeping and six refining. For further magnetic separation of rare earth minerals from flotation fluorite concentrate, the grade of fluorite concentrate CaF₂ is 97.63%, the recovery rate is 73.57%, the REO grade of rare earth concentrate is 38.57%, and the recovery rate is 45.27%. The grade of barite concentrate BaSO4 is 90.35% and the recovery of BaSO4 is 75.48%.