Study on Mechanism of Composite Collectors and Combined Inhibitors in Flotation Separation Experiments of Micro-fine Monaziteand Fluorite
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摘要:
为提高微细粒(-15 μm)独居石和萤石的浮选分离效果, 通过浮选试验、XPS测试和显微聚团分析, 对组合抑制剂水玻璃+乙二胺四乙酸(EDTA)和复合捕收剂辛基羟肟酸(OHA)+辛基酚聚氧乙烯醚(OP)在独居石和萤石浮选分离试验中的应用效果和作用机理进行了分析。结果表明, 针对-15 μm独居石和萤石质量比1 GA6FA 1的人工混合矿, 联合使用组合抑制剂和复合捕收剂, 可以得到独居石回收率80%、萤石回收率24.4%的浮选精矿, 相比于仅使用单一抑制剂或单一捕收剂时, 独居石的浮选回收率及独居石与萤石的浮选分离效果明显提高; EDTA能够络合清除独居石表面的Ca2+离子, 提高抑制剂对萤石的选择性抑制作用; OP和OHA可以协同吸附在独居石表面, 促使微细粒独居石疏水聚团, 从而提高其浮选回收。
Abstract:To improve the flotation separation of micro-fine (-15 μm) monazite and fluorite, the flotation test, XPS test, and microaggregation analysis were used to investigate the application effect and mechanism of the combined inhibitors sodium silicate + ethylenediamine tetraacetic acid (EDTA) and composite collectors octyl hydroxamic acid (OHA) + octylphenol ethoxylate (OP) in flotation tests. The results showed that employing the combined inhibitors and composite collectors for the artificial mixed ores of -15 μm monazite and fluorite with a mass ratio of 1 GA6FA 1, a flotation concentrate with a recovery of 80% monazite and 24.4% fluorite was obtained. Furthermore, as compared to results obtained with only a single inhibitor or collector, both the flotation recovery of monazite and the flotation separation of monazite from fluorite were significantly improved. Additionally, EDTA was able to complex and remove Ca2+ ions from the surface of monazite, as well as facilitate the selective inhibition of fluorite by inhibitors. OP and OHA could synergistically adsorb on monazite surface, promoting hydrophobic agglomeration of micro-fine monazite and thereby improving the flotation recovery of monazite.
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Key words:
- combined inhibitors /
- composite collectors /
- hydrophobic agglomeration /
- monazite /
- fluorite /
- micro-fine particle /
- rare earth
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表 1 经Ca2+、EDTA及水玻璃单独或联合处理前后独居石表面相对原子浓度
Table 1. Atomic concentration for elements on monazite surfaces in the absence and presence of Ca2+、EDTA and sodium silicate individually or in combination
/% 样品 相对原子浓度 Ce La C O P Th Ca Si 独居石 4.19 1.75 35.35 48.42 9.56 0.73 - - 独居石+水玻璃 2.64 1.7 33.51 51.64 7.48 0.8 - 2.23 独居石+Ca2+ +水玻璃 2.04 1.26 38 45.01 7.31 0.7 1.73 3.95 独居石+Ca2++ EDTA+水玻璃 2.38 1.2 34.59 52.48 7.44 0.86 - 1.05 
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