Ran Tian, Zhiwei Peng, Wanlong Fan, Guanwen Luo, Mingjun Rao
{"title":"微波辐射下磁铁矿球团预热特性研究","authors":"Ran Tian, Zhiwei Peng, Wanlong Fan, Guanwen Luo, Mingjun Rao","doi":"10.1007/s11837-024-06955-y","DOIUrl":null,"url":null,"abstract":"<div><p>The microwave preheating characteristics of magnetite pellets were investigated based on the microwave absorption capability analysis. With increasing microwave power from 1100 W to 1500 W, the initial heating rate of the pellets increased from 134.9°C/min to 233.0°C/min and then decreased because of the decrease in microwave magnetic loss induced by the oxidation of Fe<sub>3</sub>O<sub>4</sub> to Fe<sub>2</sub>O<sub>3</sub> and more heat loss from the pellets to the surroundings. With the same terminal temperature, the pellets after microwave preheating (MP pellets) obtained higher oxidation fraction and compressive strength and lower porosity than those produced by conventional preheating (CP pellets), associated with the variations of content and crystallite size of Fe<sub>2</sub>O<sub>3</sub>. Moreover, MP pellets had larger and more concentrated Fe<sub>2</sub>O<sub>3</sub> particles in their cores than their shells and the corresponding areas in CP pellets, demonstrating the advantages of microwave which intensified the oxidation of the pellets in the preheating process.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"77 1","pages":"133 - 143"},"PeriodicalIF":2.1000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Preheating Characteristics of Magnetite Pellets Under Microwave Irradiation\",\"authors\":\"Ran Tian, Zhiwei Peng, Wanlong Fan, Guanwen Luo, Mingjun Rao\",\"doi\":\"10.1007/s11837-024-06955-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The microwave preheating characteristics of magnetite pellets were investigated based on the microwave absorption capability analysis. With increasing microwave power from 1100 W to 1500 W, the initial heating rate of the pellets increased from 134.9°C/min to 233.0°C/min and then decreased because of the decrease in microwave magnetic loss induced by the oxidation of Fe<sub>3</sub>O<sub>4</sub> to Fe<sub>2</sub>O<sub>3</sub> and more heat loss from the pellets to the surroundings. With the same terminal temperature, the pellets after microwave preheating (MP pellets) obtained higher oxidation fraction and compressive strength and lower porosity than those produced by conventional preheating (CP pellets), associated with the variations of content and crystallite size of Fe<sub>2</sub>O<sub>3</sub>. Moreover, MP pellets had larger and more concentrated Fe<sub>2</sub>O<sub>3</sub> particles in their cores than their shells and the corresponding areas in CP pellets, demonstrating the advantages of microwave which intensified the oxidation of the pellets in the preheating process.</p></div>\",\"PeriodicalId\":605,\"journal\":{\"name\":\"JOM\",\"volume\":\"77 1\",\"pages\":\"133 - 143\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2024-10-30\",\"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/s11837-024-06955-y\",\"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/s11837-024-06955-y","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}
Preheating Characteristics of Magnetite Pellets Under Microwave Irradiation
The microwave preheating characteristics of magnetite pellets were investigated based on the microwave absorption capability analysis. With increasing microwave power from 1100 W to 1500 W, the initial heating rate of the pellets increased from 134.9°C/min to 233.0°C/min and then decreased because of the decrease in microwave magnetic loss induced by the oxidation of Fe3O4 to Fe2O3 and more heat loss from the pellets to the surroundings. With the same terminal temperature, the pellets after microwave preheating (MP pellets) obtained higher oxidation fraction and compressive strength and lower porosity than those produced by conventional preheating (CP pellets), associated with the variations of content and crystallite size of Fe2O3. Moreover, MP pellets had larger and more concentrated Fe2O3 particles in their cores than their shells and the corresponding areas in CP pellets, demonstrating the advantages of microwave which intensified the oxidation of the pellets in the preheating 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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