Pyrolysis magnetization of low-rank coal and distribution characteristics of sulfur and heavy metals in char products

Q3 Energy

燃料化学学报 Pub Date : 2023-10-01 DOI:10.1016/S1872-5813(23)60359-7

Mo CHU , Min GAO , Yan-bo YANG , Jia-bao HU , Fei-yong LV , Hao-yang WANG , Liang-liang WANG

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引用次数: 1

Abstract

The distribution of sulfur and heavy metals in char of Gansu lignite and Shanxi subbituminous coal was studied by means of pyrolysis and magnetic separation at different pyrolysis temperatures. The contents of sulfur and heavy metal elements in char were analyzed and determined by ICP-OES and ICP-MS, and the mineral composition and apparent morphology of char were characterized by XRD and SEM-EDS. The results show that the highest desulfurization rates of Gansu lignite and Shanxi Subbituminous coal can reach 52.37% and 17.54% respectively under optimal conditions. This is related to the phase transition behavior of pyrite during pyrolysis. The desulphurization rate of Shanxi subbituminous char is lower than that of Gansu lignite char mainly because the occurrence and inclusion of associated minerals and the organic matter influence the transformation of pyrite during pyrolysis. Ni and Cr have a strong affinity with Fe−S minerals, which are enriched into magnetic char with sulfur. At 800 °C, Cr content in magnetic char of Gansu coal and Shanxi coal is 8698.25 and 32327.47 μg/g higher than that in non-magnetic char, respectively. The pyrolytic magnetization of low-rank coal and the distribution of sulfur and heavy metals in its char products provide data support and a new idea for removal of sulfur and heavy metals from coal.

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低阶煤的热解磁化特性及焦产物中硫和重金属的分布特征

采用热解和磁选的方法，研究了甘肃褐煤和山西次烟煤在不同热解温度下煤焦中硫和重金属的分布。采用ICP-OES和ICP-MS对煤焦中硫和重金属元素的含量进行了分析测定，并用XRD和SEM-EDS对煤焦的矿物组成和表观形貌进行了表征。结果表明，在最佳条件下，甘肃褐煤和山西次烟煤的脱硫率最高，分别达到52.37%和17.54%。这与黄铁矿在热解过程中的相变行为有关。山西亚褐煤焦的脱硫率低于甘肃褐煤焦，主要是由于伴生矿物和有机质的存在和包裹体影响了热解过程中黄铁矿的转化。Ni和Cr与Fe−S矿物具有很强的亲和力，这些矿物与硫一起富集成磁性炭。在800°C时，甘肃煤和山西煤的磁焦中Cr含量分别比非磁焦高8698.25和32327.47μg/g。低阶煤的热解磁化及其焦产物中硫和重金属的分布为煤中硫和金属的脱除提供了数据支持和新思路。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.