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Exploration on the mechanism of enhancing low-rank coal flotation with cationic surfactant in the presence of oily collector

机译：集油剂存在下阳离子表面活性剂增强低阶煤浮选机理的探索

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摘要

It is difficult to yield a high combustible matter recovery in the flotation of low rank coal with common oily collectors. This study focuses on the enhancement in flotation performance of low rank coal by combining diesel oil with didodecyldimethylammonium bromide (DDAB), as well as its corresponding intensifying mechanism. The adsorption of DDAB and/or diesel oil on the pure coal and quartz surfaces was investigated based on the zeta potential and FTIR analyses, while the floatability of the coal and quartz samples before and after pretreatment was evaluated by the attachment time and flotation results. The results indicated that DDAB had great effects on the zeta potentials of coal and quartz, and the isoelectric points of these two samples were observed at the DDAB concentrations of about 0.007 and 0.006 g/L, respectively. Additionally, according to the FTIR analyses, the physical and chemical adsorptions were proposed to interpret the adsorption of DDAB, and diesel oil and mixed diesel oil/DDAB on the coal surface, respectively. Meanwhile, the diesel oil's adsorption of on the coal surface was enhanced by the conditioning process with the mixed DDAB/diesel oil. In contrast, diesel oil adsorption on the quartz was very little in quantity. As a result, a great difference in surface hydrophobicity between the coal and the quartz was attained, and an excellent flotation performance was obtained by using the mixed DDAB/diesel oil. However, a too low surface tension of flotation pulp caused by the excessive DDAB seems to be unfavorable to the flotation of coal samples. In this case, water with less surface tension was readier to spread on the coal surface than diesel oil, thereby making the coal hydrophilic and meanwhile hindering the diesel oil's spreading on its surface.
机译：在使用普通的含油收集器进行低等级煤浮选时，很难获得较高的可燃物回收率。这项研究的重点是通过结合柴油和十二烷基二甲基溴化铵（DDAB）来提高低等级煤的浮选性能，以及其相应的强化机理。基于zeta电位和FTIR分析，研究了DDAB和/或柴油在纯煤和石英表面的吸附，并通过附着时间和浮选结果评估了预处理前后煤和石英样品的漂浮性。结果表明，DDAB对煤和石英的zeta电位有很大的影响，并且在DDAB浓度分别为0.007和0.006 g / L时观察到这两个样品的等电点。此外，根据FTIR分析，提出了物理和化学吸附来解释DDAB的吸附，以及柴油和混合柴油/ DDAB在煤表面的吸附。同时，通过混合使用DDAB /柴油的调理过程可以增强柴油对煤表面的吸附。相反，柴油在石英上的吸附量很少。结果，在煤和石英之间获得了很大的表面疏水性差异，并且通过使用混合的DDAB /柴油获得了优异的浮选性能。然而，由过量的DDAB引起的浮选浆的表面张力太低似乎不利于煤样品的浮选。在这种情况下，表面张力较小的水比柴油更易于在煤表面上扩散，从而使煤具有亲水性，同时阻碍了柴油在其表面上的扩散。

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  • 来源
    《Fuel》 |2018年第1期|190-198|共9页
  • 作者

    Chen Songjiang; Wang Shiwei; Li Lulu; Qu Jinzhou; Tao Xiuxiang; He Huan;

  • 作者单位

    China Univ Min & Technol, Sch Chem Engn & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    Xian Univ Sci & Technol, Sch Chem & Chem Engn, Xian 710054, Shaanxi, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Low rank coal; DDAB; Adsorption; Flotation; Zeta potential; FTIR;

    机译：低等级煤DDAB吸附浮选ζ电位FTIR;

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