Incorporation of impurities in tridymites from a used silica brick
Incorporation of impurities in tridymites from a used silica brick
复制标题
废硅砖中鳞石英中杂质的掺入
作者：
H. Schneider;K. Wohlleben;A. Majdič
摘要通过高分辨率微探针、X射线荧光、X射线衍射和光学显微镜研究了从用过的硅砖中提取的鳞石英中的杂质。砖的本体杂质含量从热区（4.7重量%）到砖的较冷部分（7.6重量%）强烈变化，表明材料沿沿着温度梯度传输。迁移过程的传输介质可能是高温下在大鳞石英晶体之间的狭窄脉中发生的熔体。均质鳞石英单晶的平均杂质含量在砖的热区为0.49重量%，在冷区为0.81重量%。Al 2 O3、TiO 2和Na 2 O是主要杂质成分;鳞石英不含显著量的Fe 2 O3或CaO。从砖的热区到冷区，鳞石英的a参数从4.9837 μ m减小到4.9709 μ m，减小了约0.26%，c尺寸从8.2023 μ m减小到8.1933 μ m，减小幅度较小（0.11%）。
Summary The incorporation of impurities in tridymites taken from a used silica brick have been studied by means of a high-resolution microprobe, X-ray fluorescence, X-ray diffractometry, and optical microscopy. The bulk impurity content of the brick changes strongly from the hot zone (4.7 wt%) to the colder part of the brick (7.6 wt%), indicating material transport along the temperature gradient. The transport medium for migration processes is probably a melt occurring in narrow veins between large tridymite crystals at high temperatures. The average impurity contents of homogeneous tridymite single crystals are 0.49 wt% in the hot zone of the brick and 0.81 wt% in the cold zone. Al2O3, TiO2, and Na2O are main impurity constituents; the tridymites do not contain significant amounts of Fe2O3 or CaO. The a parameters of tridymites decrease by about 0.26% from 4.9837 Å to 4.9709 Å from the hot zone to the cold zone of the brick and the c dimension shows a smaller decrease (0.11 %) from 8.2023 Å to 8.1933 Å.