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首頁> 外文學(xué)位 >A comparison of freshly ground crystalline quartz and naturally occurring crystalline quartz in ball clays.
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A comparison of freshly ground crystalline quartz and naturally occurring crystalline quartz in ball clays.

機譯：球形粘土中新近研磨的晶體石英和天然存在的晶體石英的比較。

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摘要

The physical characteristics of crystalline quartz presented in a variety of as mined ball clay and freshly ground quartz have been investigated. Microstructures of ground quartz and geologically aged quartz in ball clay have been examined to understand morphological differences of quartz. Scanning electron micrograph showed that freshly ground quartz (Min-U-Sil) particles have sharp edges. In contrast, much of quartz found in ball clay appeared, under microscope, as well rounded and subangular grains typical of sedimentary deposit. Semi-quantitative x-ray diffraction method for measuring quartz crystallinity was carried out on ground quartz and ball clays. It was found that the average crystallinity index (CI) value of freshly ground quartz was 9.6 in the range of 1–10, whereas, CI of ball clays were varying between 7.5 and 9.0 in terms of types of ball clays.; The index of crystallinity was examined to observe the effect of processing conditions including grinding, various temperature, and size fraction on crystallinity of different types of ball clays. It was shown that the CI value of quartz was changed in the presence of physical absorbed water and amount of surface hydroxyl. When the crude ball clays were fired up to 200°C for 2 hours, the CI values were diminished. However, the airfloated ball clays' crystallinity increased with the temperature. The relation between particle size and CI was observed by collecting samples in the range of +44 μm, −44 μm, and 5 μm size. CI of −44 μm particles was greater than +44 μm particles. Grinding and aging effects on index of quartz crystallinity was determined. The result showed that crystallinity of quartz decreased with aging after grinding.; A new semi-quantitative method was proposed by using diffuse reflectance infrared spectroscopy to obtain crystallinity index value of quartz. The ratio of bands at 800–780 cm−1 was used to measure crystallinity of quartz. A correlation (R2 = 0.82) between CI results from x-ray diffraction and results from diffuse reflectance infrared spectroscopy was found.
機譯：研究了各種礦山球粘土和剛研磨的石英中所呈現(xiàn)的晶體石英的物理特性。為了了解石英的形態(tài)差異，對球狀粘土中的地面石英和經(jīng)過地質(zhì)處理的石英的微觀結(jié)構(gòu)進行了檢查。掃描電子顯微鏡照片顯示，剛研磨的石英（Min-U-Sil）顆粒具有鋒利的邊緣。相反，在顯微鏡下，球形黏土中發(fā)現(xiàn)的許多石英以及沉積沉積物中典型的圓形和亞角粒出現(xiàn)。在磨碎的石英和球粘土上進行了用于測量石英結(jié)晶度的半定量x射線衍射方法。研究發(fā)現(xiàn)，剛磨碎的石英的平均結(jié)晶度指數(shù)（CI）在1-10范圍內(nèi)為9.6，而球形黏土的CI在球形黏土類型方面介于7.5和9.0之間。檢查結(jié)晶度指數(shù)以觀察包括研磨，各種溫度和尺寸分數(shù)的加工條件對不同類型的球狀粘土的結(jié)晶度的影響。結(jié)果表明，在物理吸收水和表面羥基含量存在的情況下，石英的CI值會發(fā)生變化。當將粗制球形粘土在200°C下燒成2小時后，CI值降低。但是，氣浮球粘土的結(jié)晶度隨溫度升高而增加。通過收集大小在+44μm，-44μm和5μm范圍內(nèi)的樣品，觀察到了粒徑與CI的關(guān)系。 -44μm顆粒的CI大于+44μm顆粒。確定了研磨和時效對石英結(jié)晶度指標的影響。結(jié)果表明，石英的結(jié)晶度隨著研磨后的時效而降低。提出了一種利用漫反射紅外光譜法獲得石英結(jié)晶度指數(shù)的新半定量方法。使用800–780 cm -1 處的能帶比來測量石英的結(jié)晶度。發(fā)現(xiàn)X射線衍射的CI結(jié)果與漫反射紅外光譜的CI結(jié)果之間具有相關(guān)性（R 2 = 0.82）。

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  • 作者

    Gocmez, Hasan.;

  • 作者單位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予單位 Rutgers The State University of New Jersey - New Brunswick.;
  • 學(xué)科 Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2001
  • 頁碼 137 p.
  • 總頁數(shù) 137
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 工程材料學(xué);
  • 關(guān)鍵詞

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