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Advances towards adoption of ultra-fines recovery in coal mines .

机译：煤矿采用超细粉回收的进展。

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摘要

Maximizing the recovery of combustible values from mined coal is essential for increasing energy availability, improving coal mining profitability and reducing environmental impacts of coal mining. Hence, very efficient heavy medium separation technologies are utilized in coal preparation to treat the +1 mm size fractions. Research over the past two decades has focused on improving the efficiency of cleaning the -1 mm size fraction. For treating the 1 mm x 149 mum size fraction, spirals have become commonplace with a host of other enhanced gravity technologies available for use. Recovery of the ultra-fine 149 mum x 0 size fraction still remains a challenge. Development of column flotation in the 1980s provided major advantages over the conventional flotation cells. Despite the improvement, the application of column flotation in coal preparation has been limited due to lack of efficient dewatering technologies that can dewater the flotation product to acceptably low moisture contents such that the product can be blended with coarse clean coal without impacting the overall product quality. Hence, even where column flotation has been used, it has been applied for cleaning primarily the 149 x 44 mum size fraction with the -44 mum size fraction still being discarded in refuse ponds which are a significant environmental liability.; Through this research on existing commercial technologies, the author has developed, demonstrated and presented a comprehensive technology here that can maximize the recovery of combustible values in the ultra-fines. For the application of this comprehensive technology, a methodology is devised and demonstrated which not only overcomes the limitations related to dewatering on the product quality but in fact enables the new technology to enhance the overall product quality while still maximizing the energy recovery. This dissertation compiles the author's work in the areas of developing mathematical models to improve the predictability of flotation column carrying capacities, ultra-fines dewatering, circuit optimization, coal quality enhancement through the application of fine coal cleaning, and development of innovative coarse coal circuits for improving efficiency. The original dissertation work has led to the evolution of a technology and an approach which can maximize the energy recovery from mined coal and make ultra-fines recovery a universally applicable technology. In the marketplace of the future with increasing emphasis on reducing the environmental footprint of coal mining, ultra-fines recovery will further enable improved product qualities - higher heating value and lower pollutants (sulfur, mercury and other trace elements) without impacting recovery or economics.
机译：最大限度地从开采的煤中回收可燃物，对于提高能源利用率，提高煤矿的盈利能力和减少煤矿对环境的影响至关重要。因此，在选煤中使用了非常有效的重介质分离技术来处理+1毫米大小的馏分。在过去的二十年中，研究集中在提高清洗-1毫米大小部分的效率上。为了处理1毫米x 149毫米的颗粒，螺旋与许多其他可使用的增强重力技术变得司空见惯。 149毫米x 0尺寸超细颗粒的回收仍然是一个挑战。与传统的浮选池相比，1980年代浮选柱的发展提供了主要优势。尽管有所改进，但由于缺乏有效的脱水技术，无法将浮选产品脱水至可接受的低水分含量，因此在煤制备中的柱浮选应用受到了限制，因此该产品可以与粗净煤混合，而不会影响整体产品质量。因此，即使在使用柱浮选的情况下，它也主要用于清洁149 x 44微米级的馏分，而-44微米级的馏分仍被丢弃在垃圾塘中，这对环境造成了重大影响。通过对现有商业技术的研究，作者在此处开发，演示并提出了一种综合技术，该技术可以最大程度地回收超细物中的可燃物。对于这种综合技术的应用，设计并演示了一种方法，该方法不仅克服了与脱水有关的产品质量限制，而且实际上使新技术能够提高总体产品质量，同时仍能最大程度地提高能量回收率。本文在开发数学模型以提高浮选柱承载能力的可预测性，超细颗粒脱水，回路优化，通过应用精煤清洗提高煤炭质量以及开发创新的粗煤回路方面，对作者的工作进行了汇编。提高效率。最初的论文工作导致了技术和方法的发展，该技术和方法可以最大程度地提高开采煤的能量回收并使超细粉回收成为普遍适用的技术。在未来的市场中，越来越重视减少煤炭开采的环境足迹，超细粉回收将进一步提高产品质量-更高的热值和更低的污染物（硫，汞和其他微量元素），而不会影响回收或经济性。

著录项

  • 作者

    Patwardhan, Amit.;

  • 作者单位

    Southern Illinois University at Carbondale.$bEngineering Science.;

  • 授予单位 Southern Illinois University at Carbondale.$bEngineering Science.;
  • 学科 Engineering Mining.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 186 p.
  • 总页数 186
  • 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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