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Chemical demineralization of high ash Indian coal by using alkali and acid solutions

机译：使用碱和酸溶液对高灰分印度煤进行化学脱盐

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摘要

In the present work an attempt have been made to upgrade the low grade Indian coal to high grade coal by using caustic (NaOH) leaching followed by acid (H2SO4) treatment. The experimental works aimed at a selective attack on in situ MCL (Mahanadi Coal Limited) coal, Odisha, India with some fluxing agents like NaOH and H2SO4. The leaching experiments were carried out in a stainless steel batch reactor of 2.5 L capacity with controlled heating facility. Initially, the coal sample with-16+100 mesh particle size was leached with 50-150 g/L of NaOH solution at 100 degrees C for one hour and then subjected to leach further with 20% sulfuric acid. The maximum demineralization from the level of 26% ash with NaOH (100 g/L) leaching 27.5% is achieved and with combined chemical treatment method (100 g/L NaOH followed by 20% H2SO4) was obtained 48% effectively. In addition, the results showed that the percent of demineralization improved adequately by decreasing the particle size also with rise of the leaching time and temperature. Coal characterization of raw and treated coal was done by Scanning Electron Microscopy (SEM)/ Energy Dispersive Spectroscopy (EDS) analysis and also showed that the calorific value of coal was increased with increase the percent of demineralization of coal. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在当前的工作中，已经尝试通过使用苛性碱（NaOH）浸提然后进行酸（H2SO4）处理将低品位印度煤炭升级为高品位煤炭。实验工作旨在通过使用一些助熔剂（如NaOH和H2SO4）有选择地攻击印度奥里萨邦的MCL（马哈纳迪煤炭有限公司）煤。浸出实验在容量为2.5 L的不锈钢间歇式反应器中进行，加热装置受控。首先，将粒度为16 + 100目的煤样品在100℃下用50-150 g / L的NaOH溶液浸提1小时，然后再用20％的硫酸浸提。用NaOH（100 g / L）浸出27.5％的灰分达到了26％的最大脱盐率，并采用联合化学处理方法（100 g / L NaOH，然后用20％H2SO4）有效地脱灰了48％。另外，结果表明，随着浸出时间和温度的升高，通过减小粒径也可以充分提高脱盐率。通过扫描电子显微镜（SEM）/能量色散谱（EDS）分析完成了原煤和经处理煤的煤表征，并且还表明煤的热值随煤脱矿率的增加而增加。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第may15期|102-109|共8页
  • 作者

    Behera Sushanta K.; Chakraborty Sudipto; Meikap B. C.;

  • 作者单位

    Ind Technol Inst, Dept Chem Engn, Kharagpur 721302, W Bengal, India;

    Ind Technol Inst, Dept Chem Engn, Kharagpur 721302, W Bengal, India;

    Ind Technol Inst, Dept Chem Engn, Kharagpur 721302, W Bengal, India|Univ Kwazulu Natal, Sch Engn, Howard Coll, Chem Engn, Durban, South Africa;

  • 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

    Coal; Leaching; Demineralization; Particle size; SEM; EDS;

    机译：煤;浸出;脱盐;颗粒尺寸;SEM;EDS;

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