不同螯合剂对褐煤常量金属离子浸出效应的实验研究

IF 3.4 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Reaction Chemistry & Engineering Pub Date : 2024-07-08 DOI:10.1039/D4RE00257A
Dawei Chen, Jun Xie, Jingyi Zhang, Yi Wang and Faquan Wang
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摘要

螯合剂可以通过沥滤煤炭中的金属离子来增加煤炭的孔隙率。因此,在应用螯合剂时,根据煤炭类型的特点选择最合适的螯合剂至关重要。本研究选择了中国西南地区的褐煤作为样本。评估了四种螯合剂,即亚胺二琥珀酸四钠(IDS)、二乙烯三胺五乙酸(DTPA)、天冬氨酸二乙酸钠(ASDA)和谷氨酸二乙酸钠(GLDA)对常量金属离子(CMIs)浸出的影响。使用电感耦合等离子体、扫描电子显微镜和布鲁瑙尔-艾美特-泰勒测量法对 CMIs 的浸出效应进行了表征和分析。结果表明,ASDA 螯合剂对 Ca2+、Mg2+、Fe2+/3+ 和 Al3+ 的浸出效果最好。在 2500 mg L-1 的最佳浓度条件下,不同螯合剂对 CMIs 的浸出效果可分为以下几个等级:ASDA;DTPA;IDS;GLDA。ASDA螯合剂与煤样的接触角从1 s时的48.2°下降到20 s时的26.5°,煤样表面的金属矿物在ASDA螯合剂的作用下溶解,煤样表面的微孔过渡到中孔和大孔。煤样的孔隙体积从 0.0254 cm3 g-1 增加到 0.0276 cm3 g-1,孔径从 3.26 nm 增加到 4.06 nm。随着煤的孔径增大,透气性也显著增加。
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Experimental study on the leaching effect of different chelating agents on the constant metal ions of lignite

Chelating agents can increase the porosity of coal by leaching metal ions from it. Therefore, selecting the most suitable chelating agent based on the characteristics of the coal type is crucial when applying chelating agents. In this study, lignite from southwest China was chosen as the sample. Four chelating agents, namely tetrasodium iminodisuccinate (IDS), diethylenetriaminepentaacetic acid (DTPA), tetrasodium aspartate diacetate (ASDA), and tetrasodium glutamate diacetate (GLDA), were evaluated for their impact on the leaching of constant metal ions (CMIs). The leaching effect of CMIs was characterized and analyzed using inductively coupled plasma, scanning electron microscopy, and Brunauer–Emmett–Teller measurements. The results indicated that the ASDA chelating agent was the most effective in leaching Ca2+, Mg2+, Fe2+/3+, and Al3+. Under the optimal concentration condition of 2500 mg L−1, the leaching effect of CMIs from different chelating agents could be ranked as: ASDA > DTPA > IDS > GLDA. The contact angle of the ASDA chelating agent with the coal sample decreased from 48.2° at 1 s to 26.5° at 20 s. The metal minerals on the surface of the coal dissolved under the action of the ASDA chelating agent, and the micropores on the coal surface transitioned to mesopores and macropores. The pore volume of coal samples increased from 0.0254 cm3 g−1 to 0.0276 cm3 g−1, and the pore size increased from 3.26 nm to 4.06 nm. As the pore size of the coal increased, the permeability also significantly increased.

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来源期刊
Reaction Chemistry & Engineering
Reaction Chemistry & Engineering Chemistry-Chemistry (miscellaneous)
CiteScore
6.60
自引率
7.70%
发文量
227
期刊介绍: Reaction Chemistry & Engineering is a new journal reporting cutting edge research into all aspects of making molecules for the benefit of fundamental research, applied processes and wider society. From fundamental, molecular-level chemistry to large scale chemical production, Reaction Chemistry & Engineering brings together communities of chemists and chemical engineers working to ensure the crucial role of reaction chemistry in today’s world.
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