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首页> 外文期刊>Journal of Crystal Growth >An in situ synchrotron X-ray diffraction investigation of lepidocrocite and ferrihydrite-seeded A1(OH)_3 crystallisation from supersaturated sodium aluminate liquor
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An in situ synchrotron X-ray diffraction investigation of lepidocrocite and ferrihydrite-seeded A1(OH)_3 crystallisation from supersaturated sodium aluminate liquor

机译：过饱和铝酸钠溶液中纤铁矿和水铁矿晶种的A1（OH）_3结晶的原位同步X射线衍射研究

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摘要

Lepidocrocite and ferrihydrite-seeded Al(OH)_3 crystallisation from supersaturated sodium aluminate liquor at 70℃ was investigated using in situ synchrotron X-ray diffraction. The presence of iron oxides and oxyhydroxides in the Bayer process has implications for the nucleation and growth of scale on process equipment, and a greater understanding of the effect they have on Al(OH)_3 crystallisation may allow for development of methods for Al(OH)_3 scale prevention. The early stages of both crystallisation reactions were characterised by nucleation of gibbsite on the seed material. This was followed by a rapid increase in gibbsite concentration, which coincided with the appearance of the bayerite and nordstrandite polymorphs of Al(OH)_3. The lepidocrocite-seeded reaction then proceeded via a mechanism similar to that which has been observed previously for goethite, hematite and magnetite-seeded A1(OH)_3 crystallisation. Different behaviour was observed in the ferrihydrite-seeded experiment, with nucleation as well as growth occurring during the period of rapid increase in gibbsite concentration, followed by a period of diffusion controlled growth.
机译：利用原位同步加速器X射线衍射仪研究了70℃下过饱和铝酸钠溶液中纤铁矿和水铁矿晶种的Al（OH）_3的结晶。拜耳法中氧化铁和羟基氧化铁的存在对工艺设备上的水垢成核和水垢生长有影响，对它们对Al（OH）_3结晶的影响有更深入的了解可能有助于开发Al（OH）方法）_3预防结垢。两种结晶反应的早期阶段都以晶种材料上的菱镁矿成核为特征。随后是三水铝铁矿浓度的快速增加，这与Al（OH）_3的三羟铝石和钠锰矿多晶型物的出现相吻合。然后，通过与先前针铁矿，赤铁矿和磁铁矿播种的Al（OH）_3结晶相似的机理，进行了针铁云母播种的反应。在水铁矿播种的实验中观察到不同的行为，在三水铝石浓度快速增加的时期内发生了成核和生长，随后是扩散控制的生长时期。

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  • 来源
    《Journal of Crystal Growth》 |2012年第1期|p.112-117|共6页
  • 作者

    Nathan A.S. Webster; Melissa J. Loan; Ian C. Madsen; Robert B. Knott; Greta M. Brodie; Justin A. Kimpton;

  • 作者单位

    CSIRO Process Science and Engineering, Box 312, Clayton South, VIC, 3169, Australia,Bragg Institute, ANSTO, Locked Bag 2001, Kirrawee DC, NSW, 2234, Australia;

    CSIRO Light Metals Flagship (CSIRO Process Science and Engineering/Parker Centre), Conlon St. Waterford, WA, 6152, Australia;

    CSIRO Process Science and Engineering, Box 312, Clayton South, VIC, 3169, Australia;

    Bragg Institute, ANSTO, Locked Bag 2001, Kirrawee DC, NSW, 2234, Australia;

    CSIRO Light Metals Flagship (CSIRO Process Science and Engineering/Parker Centre), Conlon St. Waterford, WA, 6152, Australia;

    Australian Synchrotron, 800 Blackburn Rd, Clayton, VIC, 3168, Australia;

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

    A1. supersaturated solutions; A1. X-ray diffraction; A2. industrial crystallisation; B1. minerals;

    机译：A1。过饱和溶液;A1。 X射线衍射;A2。工业结晶;B1。矿物质;

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