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Benefication of Collie fly ash for synthesis of geopolymer: Part 1-Beneficiation

机译：Collie粉煤灰的选矿以合成地聚合物：第1部分：选矿

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摘要

Beneficiation of the fly ash was conducted in a three stage procedure using sieving, milling and magnetic separation to improve fly ash homogeneity and reactivity. Sieving was effective in reducing large carbon particles and free primary quartz content. Most of the carbon was found to be small and finely dispersed throughout the material, making it unfeasible to remove by sieving. Sieving in conjunction with milling increased surface area from 9.83 m~2/g to 10.7 m~2/g. Magnetic separation revealed that amorphous iron was not magnetic and the complete removal of crystalline iron phases is not possible without a robust separation technique. The removal of magnetic phases increased the surface area of the sieved and milled fly ash to 12.9 m~2/g. The proportion of reactive amorphous material increased at each stage of beneficiation, resulting in increased reactivity. The increase in reactivity necessitated changes in solids:liquids ratio in order to maintain a workable geopolymer mixture which will be discussed in Part 2 of this set of papers. The outcomes from this research clearly identifies that different levels of fly ash beneficiation leads to different geopolymer properties, which in turn extend the range of applications for which geopolymers can be used.
机译：粉煤灰的选矿过程分三步进行：使用筛分，研磨和磁选以提高粉煤灰的均质性和反应性。筛分可有效减少大颗粒碳和游离初级石英含量。发现大多数碳很小，并且细小地分散在整个材料中，使其难以通过筛分除去。与研磨一起进行筛分的表面积从9.83 m〜2 / g增加到10.7 m〜2 / g。磁分离表明，非晶铁不是磁性的，如果没有可靠的分离技术，就不可能完全去除结晶铁相。磁性相的去除使经筛分和研磨的粉煤灰的表面积增加至12.9m〜2 / g。在选矿的每个阶段，反应性非晶态材料的比例都会增加，从而导致反应性提高。为了保持反应性的增加，必须改变固/液比，以保持可行的地质聚合物混合物，这将在本文第二部分中讨论。这项研究的结果清楚地表明，粉煤灰选矿的不同程度会导致不同的地质聚合物特性，进而扩展了可使用地质聚合物的应用范围。

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  • 来源
    《Fuel》 |2013年第4期|569-575|共7页
  • 作者

    Arie van Riessen; Nigel Chen-Tan;

  • 作者单位

    Centre for Materials Research, Curtin University, CPO Box U1987, Perth, Western Australia, Australia;

    Centre for Materials Research, Curtin University, CPO Box U1987, Perth, Western Australia, Australia;

  • 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

    fly ash; beneficiation; sieving; milling; magnetic separation;

    机译：粉煤灰选矿筛分铣削磁选;

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