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摘要:
褐煤极为亲水，很难通过常规浮选进行提质。本实验以吡啶类离子液体氯代十六烷基吡啶一水合物（cetylpyridinium chloride monohydrate, CCM）为石英捕收剂，采用不同调浆方式，考察了CCM的用量对蒙东胜利褐煤的反浮选效果。通过表面张力仪和FTIR，探究了CCM的溶解性质与其捕收石英的机理。浮选结果表明，由于胜利褐煤亲水性较强，正浮选效果较差，采用反浮选后，精煤产率及浮选完善度明显提高，采用零调浆方式反浮选比常规调浆方式效率更高。FTIR结果表明，CCM的吸附基本不改变石英的官能团种类，说明CCM通过静电吸附的方式吸附在石英表面从而捕收石英，同时CCM的吸附明显降低了石英羟基类含氧官能团的含量，增加了长链烷基等疏水官能团的含量，提高了石英的疏水性，促进了褐煤反浮选。
Abstract:Lignite is extremely hydrophilic; thus it is difficult to upgrade its quality by conventional flotation. In this study, cetylpyridinium chloride monohydrate (CCM) was used as the collector for quartz. The effect of CCM dosage on reverse flotation of Shengli lignite was investigated by different slurry mixing methods. And the dissolution properties of CCM and its mechanism of collecting quartz were studied via surface tensitometer and FTIR. The flotation results show that, due to the strong hydrophilicity of Shengli lignite, the performance of direct flotation is poor. With reverse flotation, the yield of clean coal and the flotation perfection are obviously improved. Besides, the reverse flotation with the zero-conditioning is more efficient than the conventional one. FTIR results show that the adsorption of CCM barely change the functional groups of quartz, indicating that CCM was adsorbed on the surface of quartz through electrostatic adsorption to collect quartz. Meanwhile, CCM adsorption significantly reduces the content of hydroxyl oxygen-containing functional groups of quartz, leading to an increase of the content of hydrophobic groups such as long-chain alkyl. As a result, the hydrophobicity of quartz was improved, and the reverse flotation of lignite was promoted.
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Key words:
- Lignite /
- Quartz /
- Reverse flotation /
- Ionic liquids /
- Infrared spectroscopy
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表 1 胜利褐煤的工业分析/%
Table 1. Proximate analysis of test samples
水分
Mad灰分
Aad挥发分
Vad固定碳
FCad19.79 10.08 28.26 41.87 
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表 2 浮选入料粒度分布
Table 2. Particle size distribution of flotation feed
粒度/mm -0.5+0.25 -0.25
+0.125-0.125+
0.074-0.074+
0.045-0.045 占比/% 37.89 26.89 14.49 9.52 11.21
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