Dawei Chen, Jun Xie, Jingyi Zhang, Yi Wang and Faquan Wang
{"title":"不同螯合剂对褐煤常量金属离子浸出效应的实验研究","authors":"Dawei Chen, Jun Xie, Jingyi Zhang, Yi Wang and Faquan Wang","doi":"10.1039/D4RE00257A","DOIUrl":null,"url":null,"abstract":"<p >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 Ca<small><sup>2+</sup></small>, Mg<small><sup>2+</sup></small>, Fe<small><sup>2+/3+</sup></small>, and Al<small><sup>3+</sup></small>. Under the optimal concentration condition of 2500 mg L<small><sup>−1</sup></small>, 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 cm<small><sup>3</sup></small> g<small><sup>−1</sup></small> to 0.0276 cm<small><sup>3</sup></small> g<small><sup>−1</sup></small>, 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.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":null,"pages":null},"PeriodicalIF":3.4000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental study on the leaching effect of different chelating agents on the constant metal ions of lignite\",\"authors\":\"Dawei Chen, Jun Xie, Jingyi Zhang, Yi Wang and Faquan Wang\",\"doi\":\"10.1039/D4RE00257A\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >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 Ca<small><sup>2+</sup></small>, Mg<small><sup>2+</sup></small>, Fe<small><sup>2+/3+</sup></small>, and Al<small><sup>3+</sup></small>. Under the optimal concentration condition of 2500 mg L<small><sup>−1</sup></small>, 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 cm<small><sup>3</sup></small> g<small><sup>−1</sup></small> to 0.0276 cm<small><sup>3</sup></small> g<small><sup>−1</sup></small>, and the pore size increased from 3.26 nm to 4.06 nm. 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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.
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.