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Effects and Mechanism Research of the Desilication Pretreatment for High-Aluminum Fly Ash

机译：高铝粉煤灰脱硅预处理的效果及机理研究

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摘要

The chemical composition and morphology properties of high-aluminum fly ash were studied by means of XRF, XRD, SEM, and EDS. It was found that silicon in high-aluminum fly ash mainly existed as mullite and amorphous SiO_2 with hardly any quartz, and both the surface of fly ash particles and the smaller fly ash particles attached on the larger ones were enriched in silica. The desilication process was used to remove the amorphous SiO_2 from high-aluminum fly ash. The desilication process was carried out using a low concentration of sodium hydroxide at a relatively low temperature. In order to improve the desilication efficiency, pretreatment was added before the desilication reaction. After comparing results of pretreatment reactions under different temperatures, the sample treated at 65 ℃ was analyzed in detail because its desilication effect was the best After additional pretreatment using the desilication process, the ratio of Al/Si in desilication fly ash was increased from 1.92 to 2.51. The silica content of the nitrate was increased by 33.58%. The reaction mechanism can be explained by the formation of zeolite P, which consumed the unstable mullite of high-aluminum fly ash and blocked the formation of hydroxy sodalite in the reaction during treatment at 95 ℃.
机译：利用XRF，XRD，SEM和EDS研究了高铝粉煤灰的化学成分和形貌特性。研究发现，高铝粉煤灰中的硅主要以莫来石和无定形SiO_2的形式存在，几乎没有石英，并且粉煤灰颗粒的表面和附着在较大粉煤灰颗粒上的较小粉煤灰颗粒均富含二氧化硅。脱硅过程用于从高铝粉煤灰中去除非晶态SiO_2。脱硅过程是在相对较低的温度下使用低浓度的氢氧化钠进行的。为了提高脱硅效率，在脱硅反应之前进行了预处理。比较不同温度下的预处理反应结果后，详细分析了在65℃处理的样品，因为其脱硅效果最好。在使用脱硅工艺进行了额外的预处理之后，脱硅粉煤灰中Al / Si的比例从1.92增加到2.51。硝酸盐的二氧化硅含量增加了33.58％。反应机理可以通过形成沸石P来解释，该沸石消耗了高铝粉煤灰中不稳定的莫来石，并在95℃处理过程中阻止了反应中羟基方钠石的形成。

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  • 来源
    《Energy & fuels》 |2013年第novaadeca期|6948-6954|共7页
  • 作者

    Guorui Zhu; Wei Tan; Junmin Sun; Yanbing Gong; Sheng Zhang; Zhanjun Zhang; Liyan Liu;

  • 作者单位

    School of Chemical Engineering &Technology, Tianjin University, Tianjin 300072, Peopled Republic China;

    School of Chemical Engineering &Technology, Tianjin University, Tianjin 300072, Peopled Republic China;

    Datang International Power Generation Co., LTD., High Alumina Coal Resources Development and Utilization of R&D Center, Hohhot 010206, People's Republic of China;

    Datang International Power Generation Co., LTD., High Alumina Coal Resources Development and Utilization of R&D Center, Hohhot 010206, People's Republic of China;

    Datang International Power Generation Co., LTD., High Alumina Coal Resources Development and Utilization of R&D Center, Hohhot 010206, People's Republic of China;

    Datang International Power Generation Co., LTD., High Alumina Coal Resources Development and Utilization of R&D Center, Hohhot 010206, People's Republic of China;

    School of Chemical Engineering &Technology, Tianjin University, Tianjin 300072, Peopled Republic China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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