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首页> 外文学位 >Development of advanced techniques for evaluating fine coal cleanability and froth flotation technologies.
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Development of advanced techniques for evaluating fine coal cleanability and froth flotation technologies.

机译：开发用于评估细煤清洁性和泡沫浮选技术的先进技术。

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摘要

Separation performances obtained from column flotation technologies have been found to be superior to the characteristic flotation response curve generated from the traditional flotation washability procedures such as release and tree analysis. This phenomenon clearly indicates the inadequacy of the traditional flotation washability procedures. Thus, the main objective of this study was to develop a suitable process to characterize the ultimate flotation response of a fine coal sample, which can be utilized for a precise assessment of the cleaning potential of a coal and for an appropriate evaluation of the advanced flotation technologies.; A novel automated device using a batch-operated flotation column has been developed to obtain the ultimate separation performance and is referred to as Advanced Flotation Washability (AFW) analysis. The separation performances obtained from the AFW procedure were found to be superior to those obtained from the traditional flotation washability procedures such as release and tree analyses. To verify the maximum selectivity achieved by AFW analysis, an experimental program was conducted to obtain an enhanced flotation performance from multiple stage cleaning using continuously operating flotation columns. The resulting enhanced separation performances were found not to surpass the cleaning performance predicted from the AFW analysis, which is evidence that the AFW curve may represent the optimum flotation cleaning performance.; Based on this optimum performance, a new characteristic Flotation Index was derived, which provides a quantitative assessment of the ash and sulfur cleaning potential of a coal.; Utilizing the flotation index conception a comparative evaluation was conducted using three leading column flotation technologies, which utilize different types of bubble-particle attachment environments. One of the counter-current systems, which provides a near plug-flow flotation environment due to the presence of corrugated packing material in the cell, produced the best separation performance because of its ability to support an extremely deep froth zone. However, because of the absence of an air sparging system and, consequently, larger bubbles, the froth carrying capacity was the minimum. On the other hand, the carrying capacity achieved by a self air-inducing co-current system, which provides an intimate bubble-particle attachment environment characterized by an extremely high air fraction and ultrafine bubbles, was found to be the maximum.
机译：已经发现，通过柱浮选技术获得的分离性能优于通过传统浮选可洗性程序（如释放和树木分析）生成的特征浮选响应曲线。这种现象清楚地表明了传统浮选可洗性程序的不足。因此，本研究的主要目的是开发一种表征细煤样品最终浮选响应的合适方法，该方法可用于精确评估煤的清洁潜力并适当评估晚期浮选。技术。已经开发出一种使用批处理浮选柱的新型自动化设备，以获得最终的分离性能，并被称为高级浮选可洗性（AFW）分析。发现从AFW方法获得的分离性能优于从传统浮选可洗性方法如释放和树分析获得的分离性能。为了验证通过AFW分析获得的最大选择性，进行了一个实验程序，以使用连续操作的浮选柱从多级清洗中获得增强的浮选性能。所发现的增强的分离性能未超过AFW分析所预测的清洁性能，这证明AFW曲线可代表最佳浮选清洁性能。基于这种最佳性能，得出了新的特征浮选指数，该指数可定量评估煤的灰分和硫磺清除潜力。利用浮选指数概念，​​使用三种领先的柱浮选技术进行了比较评估，这些技术利用了不同类型的气泡-颗粒附着环境。一种逆流系统（由于池中存在波纹状填充材料而提供了接近活塞流的浮选环境）由于具有支撑极深泡沫区域的能力而产生了最佳的分离性能。但是，由于没有空气喷射系统，因此气泡较大，泡沫的承载能力最小。另一方面，发现通过自导风的并流系统实现的承载能力最大，该系统提供了以极高的空气分数和超细气泡为特征的紧密的气泡-颗粒附着环境。

著录项

  • 作者

    Mohanty, Manoj Kumar.;

  • 作者单位

    Southern Illinois University at Carbondale.;

  • 授予单位 Southern Illinois University at Carbondale.;
  • 学科 Engineering Mining.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 178 p.
  • 总页数 178
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 矿业工程;
  • 关键词

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