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

被引：5

作者：

Li C. ^{[1
]}

Han R. ^{[1
]}

Zhou A. ^{[1
,2
]}

Zhang N. ^{[1
]}

Guo K. ^{[1
]}

Chen H. ^{[1
]}

Chen X. ^{[1
]}

Li Z. ^{[1
,2
]}

Wang J. ^{[1
,3
]}

机构：

[1] School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an

[2] Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, MNR, Xi’an

[3] Shaanxi Coal Chemical New Energy Co. Ltd, Xi’an

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2024年 / 52卷 / 05期

基金：

中国国家自然科学基金;

关键词：

acid leaching; coal gasification fine slag; porous material; residue carbon; ultrasound;

D O I：

10.1016/S1872-5813(23)60402-5

中图分类号：

学科分类号：

摘要：

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 FTIR. 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 ℃, 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. © 2024 Science Press. All rights reserved.

引用

页码：630 / 646

页数：16

共 34 条

[1]

MENG J, LIAO W, ZHANG G., Emerging CO2-mineralization technologies for co-utilization of industrial solid waste and carbon resources in China[J], Minerals, 11, 3, (2021)

[2]

LV Feiyong, CHU Mo, YI Haoran, Et al., Distribution characteristics of magnetic ash particles in gasification slag of different particle sizes[J], Chem Ind Eng Prog, 41, 5, pp. 2372-2378, (2022)

[3]

HAN R, ZHOU A N, ZHANG N N, Et al., Structural properties of residual carbon in coal gasification fine slag and their influence on flotation separation and resource utilization: A review[J], Int J Min Met Mater, 31, (2024)

[4]

WU S, HUANG S, WU Y, Et al., Characteristics and catalytic actions of inorganic constituents from entrained-flow coal gasification slag[J], J Energy Inst, 88, 1, (2015)

[5]

GAO Ying, ZHAO Wei, ZHOU Anning, Et al., Study on the composition and structure characteristics and dry decarbonization separation of coal water slurry gasification fine slag[J], J Fuel Chem Technol, 50, 8, pp. 954-965, (2022)

[6]

WAGNER N J, MATJIE R H, SLAGHUIS J H, Et al., Characterization of unburned carbon present in coarse gasification ash[J], Fuel, 87, 6, pp. 683-691, (2008)

[7]

GU Y, QIAO X., A carbon silica composite prepared from water slurry coal gasification slag[J], Microporous Mesoporous Mater, 276, pp. 303-307, (2019)

[8]

REN L, DING L, GUO Q, Et al., Characterization, carbon-ash separation and resource utilization of coal gasification fine slag: A comprehensive review, J Clean Prod, (2023)

[9]

LIU S, CHEN X, AI W, Et al., A new method to prepare mesoporous silica from coal gasification fine slag and its application in methylene blue adsorption[J], J Clean Prod, 212, pp. 1062-1071, (2019)

[10]

DU M, HUANG J, LIU Z, Et al., Reaction characteristics and evolution of constituents and structure of a gasification slag during acid treatment[J], Fuel, 224, (2018)

← 1 2 3 4 →