邓明瑞,刘红娜. 煤岩有机显微组分分离富集的意义及其研究现状[J]. 选煤技术,2023,51(6):54 − 65. DOI: 10.16447/j.cnki.cpt.2023.06.007
    引用本文: 邓明瑞,刘红娜. 煤岩有机显微组分分离富集的意义及其研究现状[J]. 选煤技术,2023,51(6):54 − 65. DOI: 10.16447/j.cnki.cpt.2023.06.007
    DENG Mingrui, LIU Hongna. Significance of separation and enrichment of organic coal macerals and status quo of related research work[J]. Coal Preparation Technology, 2023, 51(6): 54 − 65. DOI: 10.16447/j.cnki.cpt.2023.06.007
    Citation: DENG Mingrui, LIU Hongna. Significance of separation and enrichment of organic coal macerals and status quo of related research work[J]. Coal Preparation Technology, 2023, 51(6): 54 − 65. DOI: 10.16447/j.cnki.cpt.2023.06.007

    煤岩有机显微组分分离富集的意义及其研究现状

    Significance of separation and enrichment of organic coal macerals and status quo of related research work

    • 摘要: 传统选煤,主要关注煤炭的脱硫降灰,目前技术已十分成熟。为寻找煤炭洗选新的技术经济增长点,基于煤岩有机显微组分在颜色、形态、元素组成、分子结构、硬度和脆度、密度、表面性质等方面的差异,综述了煤岩有机组分在不同用途中性能的差异以及分离、富集的意义:炼焦方面,若将大量赋存的低阶烟煤中的镜质组分离、富集后做配煤炼焦,将大大扩展炼焦煤原料的来源,有效降低对外部的依赖;液化方面,镜质组和壳质组的转化速率和油收率明显高于惰质组,若能将其有效富集,无疑将对煤的直接液化以及整个煤炭液化行业起到促进作用;其他方面,如燃烧、制作碳素材料等等,显微组分间的分离、富集也意义较大,是精细分质利用的前提。因而,煤岩有机显微组分分离、富集方面的研究尤为重要,常用方法包括手选、图像识别分选、重选、浮选、电选等,其中重选、浮选相对而言更加成熟;但目前分离、富集方法的研究,解离时过于注重解离度,导致后续分选环节的入料粒度偏细、分选难度大、成本高,且不利于后续产品利用。分析认为,应重视图像识别分选和分选原料选择,提出了阶段解离、阶段富集的整体分选思路,可在保证效果的同时降低生产成本,进一步促进有机显微组分分离、富集的发展。

       

      Abstract: Traditional coal cleaning operations are proceeded with the stress centered on sulfur removal and ash reduction, and the technologies applied are quite mature in the current stage. With an aim to explore the new techno-economical growth point in coal preparation, the paper presents general survey of the different properties of macerals required by different sectors to illustrate the significance in making separation and enrichment of coal macerals. The technical survey is made based on the difference of macerals in color, form, elementary composition, molecular structure, hardness, frangibility, density, surface property, etc. It is noted that for the coking sector, the use of the separated and enriched tellinite, which is in mass occurrence in low-rank bituminous coal, as a coking blend can greatly expanded the sources of coking coal materials, and hence reduce the reliance on supply of the materials from external sources; for the coal liquefaction sector, the effective enrichment of the tellinite and liptinite which can yield a higher conversion rate and oil recovery than tellinite can undoubtedly play a significant role in promoting the direct liquefaction of coal and the whole coal liquefaction sector; and in the case of using macerals as fuel or for making carbon, the separation and enrichment of macerals is also of vital importance because it is prerequisite for utilization of the macerals according to well-defined quality standards. The research and development of the macerals separation and enrichment technologies is of particularly paramount importance. The methods commonly used include handpicking, image identification, heavy-medium separation, flotation and electrical concentration, out of which the heavy-medium separation and flotation methods are more matured in technology. The research work is currently made, however, with excessive stress on degree of liberation of intergrown constituents, causing as a result the difficulty and high cost of the subsequent processing links in treating a material with a much reduced size, which is unfavorable for the utilization of the products of the follow-up processes. Analysis shows importance needs to be placed on the right way of using the image identification method and the selection of the material to be separated. An overall maceral separation idea of making stepwise liberation and stepwise enrichment is proposed. While ensuring the separation efficiency, the use of the proposed method can lead to reduction of operating cost and help promote the development of the organic macerals separation and enrichment undertakings.

       

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