{"title":"促进粉煤灰中铝溶解行为的助熔剂研究","authors":"H. M. Cui, K. X. Li, L. Y. Sun, Y. Deng, Y. Xu","doi":"10.1007/s11837-024-06764-3","DOIUrl":null,"url":null,"abstract":"<div><p>Aluminum recycling is an important step to achieve high value-added utilization of fly ash to improve the leaching efficiency of Al. In this paper, Na<sub>2</sub>CO<sub>3</sub> was used as the flux and HCl as the leaching solution to extract Al from CFA by using the roasting activation-acid leaching process to investigate the influencing factors of the leaching rate of Al to analyze the mineral composition of the roasting products explore the activation process of CFA roasting. The experimental results showed that compared with NaF, CaO, and NaOH, the highest Al leaching rate was achieved when Na<sub>2</sub>CO<sub>3</sub> was used as a flux, at which time the leaching rate could reach up to 81.62%, and it was about 63% higher than that of extracting Al from the fly ash using direct roasting-acid leaching method. When the roasting time is 90 min, the roasting temperature is 850°C, the CFA/Na<sub>2</sub>CO<sub>3</sub> is 1.5, the hydrochloric acid concentration is 4 mol/L, the acid leaching temperature is 90°C, the S/L is 1:4, and the maximum leaching rate of Al is 81.62%. According to the thermodynamic theory, Na<sub>2</sub>CO<sub>3</sub> and mullite gradually reacted with each other above 800 K to form chalcopyrite, and Na<sub>2</sub>CO<sub>3</sub> reacted with mullite and quartz in CFA to form chalcopyrite more easily. According to the reaction kinetic model, the acid leaching process of CFA is mainly controlled by diffusion, and a semi-empirical equation is proposed to describe the whole leaching process.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"76 10","pages":"5816 - 5827"},"PeriodicalIF":2.1000,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study of Fluxes to Promote the Dissolution Behavior of Al in Fly Ash\",\"authors\":\"H. M. Cui, K. X. Li, L. Y. Sun, Y. Deng, Y. Xu\",\"doi\":\"10.1007/s11837-024-06764-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Aluminum recycling is an important step to achieve high value-added utilization of fly ash to improve the leaching efficiency of Al. In this paper, Na<sub>2</sub>CO<sub>3</sub> was used as the flux and HCl as the leaching solution to extract Al from CFA by using the roasting activation-acid leaching process to investigate the influencing factors of the leaching rate of Al to analyze the mineral composition of the roasting products explore the activation process of CFA roasting. The experimental results showed that compared with NaF, CaO, and NaOH, the highest Al leaching rate was achieved when Na<sub>2</sub>CO<sub>3</sub> was used as a flux, at which time the leaching rate could reach up to 81.62%, and it was about 63% higher than that of extracting Al from the fly ash using direct roasting-acid leaching method. When the roasting time is 90 min, the roasting temperature is 850°C, the CFA/Na<sub>2</sub>CO<sub>3</sub> is 1.5, the hydrochloric acid concentration is 4 mol/L, the acid leaching temperature is 90°C, the S/L is 1:4, and the maximum leaching rate of Al is 81.62%. According to the thermodynamic theory, Na<sub>2</sub>CO<sub>3</sub> and mullite gradually reacted with each other above 800 K to form chalcopyrite, and Na<sub>2</sub>CO<sub>3</sub> reacted with mullite and quartz in CFA to form chalcopyrite more easily. According to the reaction kinetic model, the acid leaching process of CFA is mainly controlled by diffusion, and a semi-empirical equation is proposed to describe the whole leaching process.</p></div>\",\"PeriodicalId\":605,\"journal\":{\"name\":\"JOM\",\"volume\":\"76 10\",\"pages\":\"5816 - 5827\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2024-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"JOM\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11837-024-06764-3\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JOM","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11837-024-06764-3","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
铝的回收利用是实现粉煤灰高附加值利用的重要步骤，以提高铝的浸出效率。本文以 Na2CO3 为助熔剂，HCl 为浸出液，采用焙烧活化-酸浸出工艺从 CFA 中提取 Al，研究 Al 浸出率的影响因素，分析焙烧产物的矿物组成，探索 CFA 焙烧活化过程。实验结果表明，与 NaF、CaO 和 NaOH 相比，以 Na2CO3 作为助熔剂时的铝浸出率最高，可达 81.62%，比直接焙烧-酸浸法从粉煤灰中提取铝的浸出率高出约 63%。当焙烧时间为 90 分钟、焙烧温度为 850℃、CFA/Na2CO3 为 1.5、盐酸浓度为 4 mol/L、酸浸温度为 90℃、S/L 为 1:4 时，铝的最大浸出率为 81.62%。根据热力学理论，Na2CO3 与莫来石在 800 K 以上逐渐反应生成黄铜矿，Na2CO3 与 CFA 中的莫来石和石英更容易反应生成黄铜矿。根据反应动力学模型，CFA 的酸浸过程主要由扩散控制，并提出了一个半经验方程来描述整个浸出过程。
Study of Fluxes to Promote the Dissolution Behavior of Al in Fly Ash
Aluminum recycling is an important step to achieve high value-added utilization of fly ash to improve the leaching efficiency of Al. In this paper, Na2CO3 was used as the flux and HCl as the leaching solution to extract Al from CFA by using the roasting activation-acid leaching process to investigate the influencing factors of the leaching rate of Al to analyze the mineral composition of the roasting products explore the activation process of CFA roasting. The experimental results showed that compared with NaF, CaO, and NaOH, the highest Al leaching rate was achieved when Na2CO3 was used as a flux, at which time the leaching rate could reach up to 81.62%, and it was about 63% higher than that of extracting Al from the fly ash using direct roasting-acid leaching method. When the roasting time is 90 min, the roasting temperature is 850°C, the CFA/Na2CO3 is 1.5, the hydrochloric acid concentration is 4 mol/L, the acid leaching temperature is 90°C, the S/L is 1:4, and the maximum leaching rate of Al is 81.62%. According to the thermodynamic theory, Na2CO3 and mullite gradually reacted with each other above 800 K to form chalcopyrite, and Na2CO3 reacted with mullite and quartz in CFA to form chalcopyrite more easily. According to the reaction kinetic model, the acid leaching process of CFA is mainly controlled by diffusion, and a semi-empirical equation is proposed to describe the whole leaching process.
期刊介绍：
JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.
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