首页> 外文期刊>The Science of the Total Environment >A two-step flocculation process on oil sands tailings treatment using oppositely charged polymer flocculants
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A two-step flocculation process on oil sands tailings treatment using oppositely charged polymer flocculants

机译:使用带相反电荷的聚合物絮凝剂对油砂尾矿进行两步絮凝处理

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摘要

Water management and treatment of mineral tailings and oil sands tailings are becoming critical challenges for the sustainable development of natural resources. Polymeric flocculants have been widely employed to facilitate the flocculation and settling of suspended fine solid particles in tailings, resulting in the separation of released water and solid sediments. In this study, a new flocculation process was developed for the treatment of oil sands tailings by using two oppositely charged polymers, i.e. an anionic polyacrylamide and a natural cationic biopolymer, chitosan. The new process was able to not only improve the clarity of supernatant after settling but also achieve a high settling efficiency. Treatment of the oil sands tailings using pure anionic polyacrylamide showed relatively high initial settling rate (ISR) of ~ 10.3 m/h but with poor supernatant clarity (>1000 NTU); while the treatment using pure cationic polymer resulted in clear supernatant (turbidity as low as 22 NTU) but relatively low ISR of >2 m/h. In the new flocculation process, the addition of anionic polyacrylamide to the tailings was followed by a cationic polymer, which showed both a high ISR (~7.7 m/h) and a low turbidity (71 NTU) of the supernatant The flocculation mechanism was further investigated via the measurements of floc size, zeta potential and surface forces. The new flocculation process was revealed to include two steps: (1) bridging of fine solids by anionic polyacrylamide, and (2) further aggregation and flocculation mediated by charge neutralisation of the cationic polymer, which significantly eliminated the fine solids in the supernatants as well as increases floc size. Our results provide insights into the basic understanding of the interactions between polymer flocculants and solid particles in tailings treatment, as well as the development of novel tailings treatment technologies.
机译:水资源管理以及矿物尾矿和油砂尾矿的处理正成为可持续发展自然资源的关键挑战。聚合絮凝剂已被广泛用于促进尾矿中悬浮的固体细颗粒的絮凝和沉降,从而将释放出的水和固体沉积物分离。在这项研究中,通过使用两种带相反电荷的聚合物,即阴离子聚丙烯酰胺和天然阳离子生物聚合物壳聚糖,开发了一种新的絮凝工艺来处理油砂尾矿。该新工艺不仅可以提高沉降后上清液的透明度,而且还可以达到很高的沉降效率。使用纯阴离子聚丙烯酰胺处理油砂尾矿显示出相对较高的初始沉降速率(ISR)〜10.3 m / h,但上清液清澈度较差(> 1000 NTU);而使用纯阳离子聚合物处理可得到澄清的上清液(浊度低至22 NTU),但ISR相对较低,> 2 m / h。在新的絮凝过程中,向尾矿中添加阴离子聚丙烯酰胺后是阳离子聚合物,该阳离子聚合物显示出较高的ISR(〜7.7 m / h)和较低的浊度(71 NTU)。通过测量絮状物尺寸,ζ电位和表面力进行了研究。揭示了新的絮凝过程包括两个步骤:(1)通过阴离子聚丙烯酰胺桥接细小固体;(2)阳离子聚合物的电荷中和介导的进一步聚集和絮凝,这也大大消除了上清液中的细小固体。随着絮团尺寸的增加。我们的结果提供了对尾矿处理中聚合物絮凝剂与固体颗粒之间相互作用的基本理解的见识,以及新型尾矿处理技术的发展。

著录项

  • 来源
    《The Science of the Total Environment》 |2016年第15期|369-375|共7页
  • 作者单位

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada;

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada;

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada;

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada;

    Civil and Environmental Engineering University of Alberta, Edmonton, AB T6G 2W2, Canada;

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oil sands tailings; Flocculation; Bridging; Charge neutralisation; Chitosan; surface forces;

    机译:油砂尾矿;絮凝;桥接;电荷中和;壳聚糖表面力;

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