Enhanced Flotation of Coal Slime with ST-diesel Microemulsion
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摘要:
柴油作为煤泥浮选的捕收剂，分散及捕收效果差、用量大。为提高柴油的分散及捕收性能，采用Span80和Tween80两种表面活性剂对煤泥浮选柴油捕收剂进行乳化，配制出液滴粒径小于100 nm的新型捕收剂ST-柴油微乳液。通过单元浮选试验研究了煤泥浮选指标的提升效果；通过接触角测试、Zeta电位分析、红外光谱分析、EDLVO理论计算等手段探讨了微乳液在煤泥表面的作用机理。ST−柴油微乳液作煤泥捕收剂时浮选效果较好，可燃体回收率可达68.13%，比柴油作捕收剂时高9.23百分点。与柴油相比，ST−柴油微乳液处理后纯煤表面接触角提高17.3°；表面Zeta电位绝对值减小；煤颗粒间相互作用总能VT的能垒降低，有利于颗粒间凝聚；表面活性剂与煤泥表面含氧官能团发生物理吸附，提高了煤粒表面疏水性。ST−柴油微乳液可作为一种新型高效的煤泥浮选捕收剂。
Abstract:As a collector for coal slime flotation, diesel oil has poor dispersion and collection effect and large dosage. In order to improve the dispersion and collection performance of diesel oil. Two surfactants, Span80 and Tween80, are used to emulsify diesel collector for coal slime flotation. A new collector ST-diesel microemulsion with droplet size less than 100 nm is being prepared. The improvement effect of slime flotation index is studied by unit flotation test. The mechanism of microemulsion on the surface of coal slime is discussed by means of contact angle test, Zeta potential analysis, infrared spectrum analysis and EDLVO theoretical calculation. When ST-diesel microemulsion is used as coal slime collector, the flotation effect is better, and the recovery rate of combustible body can reach 68.13% which is 9.23 percent higher than diesel collector. The contact angle of pure coal surface increased by 17.3° after ST-diesel microemulsion treatment compared with diesel. The absolute value of surface Zeta potential decreases. The energy barrier of the total energy VT of the interaction between coal particles is reduced, which is beneficial to the agglomeration between particles. The physical adsorption of surfactant and oxygen-containing functional groups on the surface of coal slime improves the surface hydrophobicity of coal particles. The ST-diesel microemulsion can be used as a new and efficient collector for coal slime flotation.
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Key words:
- coal slime /
- flotation /
- diesel oil /
- surfactant /
- microemulsion
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表 1 煤泥的工业分析和元素分析
Table 1. Industrial analysis and elemental analysis of coal slime
工业分析/% 元素分析/% Mad Aad Vad FCad Cad Had Oad Nad Sad 1.66 56.91 15.84 25.59 32.27 2.59 9.21 0.92 0.23 
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表 2 不同HLB值的ST−柴油微乳液三元相图微乳区面积
Table 2. Microemulsion area of ST microemulsion ternary phase diagram with different HLB values
HLB值 6 7 8 9 微乳区面积 635 819 1013 773
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