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首页> 外文学位 >Metal losses, emissions of hazardous gases, and impurities removal from aluminum by chlorine fluxing.
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Metal losses, emissions of hazardous gases, and impurities removal from aluminum by chlorine fluxing.

机译：金属损失，有害气体排放以及通过氯气助焊剂去除铝中的杂质。

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摘要

Secondary aluminum contains much more impurities such as magnesium, sodium, calcium, lithium, etc., than primary aluminum so that a metal cleaning process is needed in order to recycle it. For this purpose, "chlorine fluxing" is the most frequently employed technique. Such in-line treatment has some qualitative problems such as metal loss due to the formation of Al and Al-Mg droplets in salt fluxes during gas injection, emissions of hazardous gas, and impurities removal from metal. Hence, these problems were studied in four separate parts to reduce the adverse effects and improve the efficiency of the process.; In Part I, metal loss due to the formation of Al and Al-Mg droplets in salt fluxes during gas injection was examined by studying the effects of oxidation of metal surface and contents of chlorine in gas mixtures.; In Part II, bubbling in aluminum and Al-Mg alloys were compared based on the results obtained by measuring bubble frequency and bubble residence time.; In Part III, the efficiency of NaCl-KCl capturing AlCl{dollar}sb3{dollar} was studied to reduce the hazardous gas emissions.; In Part IV, the effect of MgCl{dollar}sb2{dollar} top salt addition on Na and Ca removal from Al-Mg alloys was examined by varying the concentration of MgCl{dollar}sb2{dollar} in salts. (Abstract shortened by UMI.)
机译：次级铝比初级铝包含更多的杂质，例如镁，钠，钙，锂等，因此需要金属清洁工艺以使其循环利用。为此，“氯气通量”是最常用的技术。这种在线处理具有一些定性问题，例如由于在注气期间在盐通量中形成Al和Al-Mg液滴而导致金属损失，有害气体的排放以及从金属中去除杂质。因此，在四个单独的部分中研究了这些问题，以减少不利影响并提高过程效率。在第一部分中，通过研究金属表面的氧化作用和气体混合物中氯含量的影响，研究了在注气过程中由于盐通量中的Al和Al-Mg液滴的形成而导致的金属损失。在第二部分中，根据测量气泡频率和气泡停留时间的结果，比较了铝和铝镁合金中的气泡。在第三部分中，研究了NaCl-KCl捕获AlCl {dollar} sb3 {dollar}的效率，以减少有害气体的排放。在第四部分中，通过改变盐中MgCl {sb2 {sdol} sb2 {dollar}的浓度，研究了MgCl {slb2s {sb2 {dollar}}顶部盐的添加对Al-Mg合金中Na和Ca去除的影响。 （摘要由UMI缩短。）

著录项

  • 作者

    Lim, Jae-Won.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Metallurgy.
  • 学位 M.A.Sc.
  • 年度 1998
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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