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首页> 外文期刊>Proceedings of the institution of mechanical engineers >The influence of surface roughness on gibbsite scale development on steel
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The influence of surface roughness on gibbsite scale development on steel

机译:表面粗糙度对三水铝石鳞片发展的影响

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摘要

Gibbsite scaling on surfaces such as tanks, pipe-work or measuring equipment is the source of many difficulties in the Bayer process. The study presented here investigates the role of surface roughness of steel in aiding gibbsite scale build-up. Steel surfaces of different roughnesses (r_a = 0.01-1.44 μm) were prepared and tested for gibbsite scaling rates in real Bayer process conditions in pregnant liquor in a filtrate tank. The roughness of the steel samples influenced the scale nucleation time and the strength of adhesion of the scale. The smoother the steel sample, the longer it took to form a complete layer of scale and the lower the adhesion strength. Once a complete layer of scale had formed then the rate of scale-on-scale growth was similar for all samples, as expected. The scale growth rate under the conditions tested was found to be an average of 22.63 mm/year.
机译:拜耳法过程中许多困难的根源是水箱,管道或测量设备等表面上的菱铁矿结垢。此处进行的研究调查了钢的表面粗糙度在协助三水铝矿垢形成中的作用。制备了具有不同粗糙度(r_a = 0.01-1.44μm)的钢表面,并在实际拜耳法条件下在滤液罐中的母液中测试了三水铝石水垢率。钢样品的粗糙度会影响氧化皮的成核时间和氧化皮的附着强度。钢样品越光滑,形成完整的氧化皮层所需的时间越长,粘合强度越低。一旦形成了完整的水垢层,则所有样品的水垢按比例生长速率均与预期的相似。发现在测试条件下的水垢生长速率平均为22.63mm /年。

著录项

  • 来源
  • 作者单位

    Department of Materials Science and Technology, University of Limerick, Limerick, Ireland,Materials and Surface Science Institute, University of Limerick, Limerick, Ireland;

    Materials and Surface Science Institute, University of Limerick, Limerick, Ireland,Chemical and Environmental Science Department, University of Limerick, Limerick, Ireland;

    Aughinish Alumina, Askeaton, Ireland;

    Materials and Surface Science Institute, University of Limerick, Limerick, Ireland,School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland;

  • 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

    gibbsite; steel; surface crystallization; bayer process;

    机译:硅藻土钢;表面结晶;拜耳法;

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