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Lithium leaching recovery and mechanisms from density fractions of an Illinois Basin bituminous coal

机译：羊水沥青沥青煤密度分数的锂浸出回收和机制

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摘要

Lithium recovery from the density fractions of Baker (namely West Kentucky No. 13) seam coal was investigated in this study. Proximate and elemental analyses showed that lithium contents in the 1.8-2.2 SG and 2.2 SG sink fractions were 185 ppm and 150 ppm, respectively, which are significantly higher than the average content of coal sources (12 ppm) and coal ashes (66 ppm) worldwide. Moreover, due to the high lithium contents and mass distribution, nearly 90% of the lithium present in the Baker coal sample was distributed in the two density fractions. Direct leaching using a HCl solution resulted in less than 10% lithium recovery, which was due to nearly 90% of the lithium being associated with insoluble solids as determined by the results from sequential extraction tests. Calcination of both density fractions under 600 degrees C for two hours followed by leaching resulted in recovery increases in the range of 70% to 80%. The pyro-metallurgical pretreatment step converted most of the associated lithium minerals to more easy-to-leach forms such as carbonate and metal oxide. Based on mineralogy characterization and leaching test results, it was concluded that the positive effects of calcination on lithium leachability resulted from the dehydration and disintegration of kaolinite as well as dehydroxylation and expansion of muscovite/illite. An analysis of the leaching kinetics revealed that the leaching rate of lithium was controlled by interface transfer and diffusion across the product layer and was negatively impacted when the calcination temperature exceeded 600 degrees C due to sintering of the kaolinite.
机译：本研究研究了贝克密度分数（即西肯塔基州No.13）煤层的锂恢复。近似和元素分析表明，1.8-2.2SG和2.2SG水槽级分的锂含量分别为185ppm和150ppm，显着高于煤源（12ppm）和煤炭（66ppm）的平均含量全世界。此外，由于高锂含量和质量分布，贝克煤样品中存在的近90％的锂分布在两个密度级分中。使用HCl溶液的直接浸出导致锂恢复小于10％，这是由于近90％的锂与不溶性固体相关的锂，如通过顺序提取试验的结果测定。煅烧600℃下的密度级分2小时，然后浸出导致恢复的速度增加70％至80％。热冶金预处理步骤将大部分相关的锂矿物转化为更易浸出的形式，例如碳酸盐和金属氧化物。基于矿物学特性和浸出测试结果，得出结论是，煅烧对锂透明性的正效应是高沥青石的脱水和崩解，以及脱羟基化和脱羟滴水/伊雷米石的膨胀。浸出动力学的分析表明，锂浸出率通过界面转移和扩散来控制产物层，当由于高岭石烧结时煅烧温度超过600℃时受到负面影响。

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  • 来源
    《Fuel》 |2020年第may15期|117319.1-117319.11|共11页
  • 作者

    Zhang Wencai; Noble Aaron; Yang Xinbo; Honaker Rick;

  • 作者单位

    Virginia Polytech Inst & State Univ Dept Min & Minerals Engn Blacksburg VA 24061 USA;

    Virginia Polytech Inst & State Univ Dept Min & Minerals Engn Blacksburg VA 24061 USA;

    Univ Kentucky Dept Min Engn Lexington KY 40506 USA;

    Univ Kentucky Dept Min Engn Lexington KY 40506 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lithium; Coal; Calcination; Acid leaching; Kinetic analysis; Sequential chemical extraction;

    机译：锂;煤;煅烧;酸浸出;动力学分析;顺序化学提取;

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