Preparation of porous materials by ultrasound-intensified acid leaching of high-carbon component in coal gasification fine slag

Q3 Energy 燃料化学学报 Pub Date : 2024-05-01 DOI:10.1016/S1872-5813(23)60402-5

LI Cuicui , HAN Rui , ZHOU Anning , ZHANG Ningning , GUO Kaiqiang , CHEN Heng , CHEN Xiaoyi , LI Zhen , WANG Junzhe

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Abstract

Coal gasification fine slag is one of the by-products from clean and efficient utilization of coal, and its resource utilization is extremely urgent. In this work, a high carbon fraction with a fixed carbon content higher than 60% was obtained by simple sieving of gasification fine slag, from which a porous material was prepared by ultrasonic acid leaching method. The adsorption performance of porous materials, being used as treatment of radioactive iodine in nuclear wastewater, is characterized by iodine adsorption value. The effects of ultrasound time, ultrasound power, acid concentration, and temperature on the iodine adsorption performance and compositional structure of the porous materials were systematically investigated by combining the results of SEM, BET, XRD, and FT-IR. The mechanisms of ultrasound-enhanced acid leaching on compositional structure of residual carbon and migration and transformation laws of the ash constituents were explored and summarized. The results show that the porous material prepared under conditions of acid concentration of 4 mol/L, acid immersion temperature of 50 °C, ultrasonic power of 210 W, and ultrasonic time of 1.5 h has the best iodine adsorption performance of 468.53 mg/g, with a specific surface area of 474.97 m²/g, and possesses a rich pore structure with predominant mesopores. The order of each factor on the iodine adsorption performance is: sonication time > acid concentration > sonication power > acid immersion temperature. The mechanism of ultrasonic enhanced acid leaching is that ultrasonic cavitation and mechanical wave action firstly enhance dissociation of carbon-ash adherent particles, thus making desorption of ash particles blocked in pore channels of the gasification slag to increase its connectivity; secondly, lead to generation of cracks on surface of the carbon and ash particles to enhance accessibility of inorganic components inside the carbon particles; and thirdly, enhance the acid leaching process by increasing mass transfer rate to strengthen leaching effect of inorganic components in the gasification slag.

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通过超声波强化酸浸煤气化细渣中的高碳成分制备多孔材料

煤气化细渣是煤炭清洁高效利用的副产品之一，其资源化利用极为迫切。本研究通过对煤气化细渣进行简单筛分，获得了固定碳含量高于 60% 的高碳组分，并用超声酸浸法制备了多孔材料。多孔材料用于处理核废水中的放射性碘，其吸附性能以碘吸附值为特征。结合扫描电镜、BET、X射线衍射和傅立叶变换红外光谱的结果，系统研究了超声时间、超声功率、酸浓度和温度对多孔材料碘吸附性能和组成结构的影响。探索并总结了超声增强酸浸出对残碳组成结构的影响机理以及灰分成分的迁移转化规律。结果表明，在酸浓度为 4 mol/L、酸浸温度为 50 ℃、超声功率为 210 W、超声时间为 1.5 h 的条件下制备的多孔材料碘吸附性能最好，吸附量为 468.53 mg/g，比表面积为 474.97 m2/g，具有以中孔为主的丰富孔隙结构。各因素对碘吸附性能的影响顺序为：超声时间；酸浓度；超声功率；浸酸温度。超声波强化酸浸出的机理是超声空化和机械波作用首先促进了碳灰粘附颗粒的解离，从而使堵塞在气化渣孔道中的灰颗粒解吸，增加了其连通性；其次，导致碳和灰颗粒表面产生裂纹，提高了碳颗粒内部无机组分的可及性；第三，通过提高传质速率来强化酸浸出过程，从而加强了气化渣中无机组分的浸出效果。

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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.