Experimental Study on Separation of Fluorite and Rare Earth from a REO-CaF2 Middlings in Sichuan
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摘要:
四川某萤石与稀土的混合中矿里稀土氧化物(REO)含量为5.85%、萤石含量为85.69%,并有少量的石英、方解石等脉石矿物。为实现两种有用矿物的有效分离以及综合回收,基于两种矿物的性质差异,采用稀土磁选—萤石浮选的选矿工艺,给矿经过“一次粗选一次精选一次扫选”的磁选流程,可获得REO含量为66.32%、稀土回收率为80.01%的稀土精矿,稀土磁选尾矿在调整剂碳酸钠用量为200 g/t、组合抑制剂改性水玻璃+腐殖酸钠用量为300+100 g/t、改性脂肪酸类捕收剂YK−6用量为400 g/t的条件下,经过一次浮选作业可获得CaF2含量为98.29%、CaF2回收率为91.69%的萤石精矿,各项指标均良好。
Abstract:The rare earth oxide (REO) content of a fluorite and rare earth mixed ore from Sichuan is 5.85%, the fluorite content is 85.69%, and there are a small amount of quartz, calcite, and other gangue minerals. To achieve effective separation and comprehensive recovery of two valuable minerals, based on their differences in properties, the rare earth magnetic separation−fluorite flotation process was implemented. Following the magnetic separation process of "one stage roughing, one stage cleaning, and one stage scavenging" a rare earth concentrate with a REO content of 66.32% and a rare earth recovery of 80.01% was obtained. The rare earth magnetic separation tailings were treated with 200 g/t of sodium carbonate, a combined inhibitor consisting of modified water glass and sodium humate at 300 and 100 g/t, respectively, and 100 g/t of modified fatty acid collector YK−6. Through a single−stage flotation operation, a fluorite concentrate with CaF2 content of 98.29% and CaF2 recovery of 91.69% was obtained, with all indices meeting satisfactory levels.
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Key words:
- rare earth /
- magnetic separation /
- fluorite /
- flotation /
- comprehensive recovery
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表 1 样品化学成分含量(质量分数)
Table 1. Chemical composition content (mass fraction) of sample
/% 成分 CaF2 REO SiO2 CaCO3 Al2O3 其他 含量 85.69 5.85 3.41 2.93 1.56 0.56 表 2 两个不同方案的实验结果
Table 2. Test results of two different schemes
方案 产品名称 产率/% 品位/% 回收率/% CaF2 REO CaF2 REO 方案一 稀土精矿 8.26 30.14 45.23 2.92 63.54 萤石精矿 80.21 97.23 2.23 91.47 30.42 尾矿 11.53 76.23 3.08 10.31 6.04 给矿 100.00 85.26 5.88 100.00 100.00 方案二 稀土精矿 3.25 44.47 61.77 1.68 31.39 萤石精矿 87.98 92.39 4.79 94.56 65.89 尾矿 8.77 36.83 1.98 3.76 2.72 给矿 100.00 85.96 6.40 100.00 100.00 表 3 闭路实验结果
Table 3. Closed-circuit test results
/% 产品名称 产率 品位 回收率 REO CaF2 REO CaF2 稀土精矿 6.85 66.32 7.99 80.01 0.60 萤石精矿 84.81 1.23 98.29 18.37 91.69 尾矿 8.34 1.10 84.04 1.62 7.71 给矿 100.00 5.68 86.92 100.00 100.00 -
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