{"title":"氧对低品位复杂铌资源冷却过程中相重构的影响","authors":"Wensheng Han, Mengjie Ran, Xiang Lu, Chuling Jiang, Yulin Zhou, Wen Chen","doi":"10.1007/s11837-025-07541-6","DOIUrl":null,"url":null,"abstract":"<div><p>Aiming at the low-grade complicated niobium (Nb) resources in Bayan Obo with complex mineral paragenesis, the phase reconstruction method through high-temperature melting–cooling technology is a promising strategy for changing the occurrence mode of niobium. However, the effects of oxygen on phase reconstruction are still unclear. In this study, the effects of oxygen on the Nb-bearing phase reconstruction were investigated by turning the oxygen concentration from 0% to 100%. Through adjusting the atmosphere from argon (Ar) into oxygen (O<sub>2</sub>), the enriched phase of Nb was transformed into calciobetafite (Ca<sub>2</sub>(Ti,Nb)<sub>2</sub>O<sub>7</sub>) from loparite ((Ce,Na,Ca)(Nb,Ti)O<sub>3</sub>). In addition, oxygen is beneficial in reducing the content of impurity elements in the pyrochlore-type Ca<sub>2</sub>(Ti,Nb)<sub>2</sub>O<sub>7</sub> phase and improving the co-enrichment of Nb and cerium (Ce). The mechanism of phase transformation under different atmospheres has been discussed through the process of crystallization. In addition, the crystallization of Fe<sub>2</sub>O<sub>3</sub> under a high oxygen concentration provides a clean recovery of iron from tailings. This study found that adjusting the oxygen concentration of the crystallization process is a controllable method of niobium-bearing phase reconstruction. In addition, this study provides useful information for the phase reconstruction of low-grade complicated niobium and rare earth resources.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"77 9","pages":"6443 - 6453"},"PeriodicalIF":2.3000,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of Oxygen on the Phase Reconstruction of Low-Grade Complicated Niobium Resources During Cooling Process\",\"authors\":\"Wensheng Han, Mengjie Ran, Xiang Lu, Chuling Jiang, Yulin Zhou, Wen Chen\",\"doi\":\"10.1007/s11837-025-07541-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Aiming at the low-grade complicated niobium (Nb) resources in Bayan Obo with complex mineral paragenesis, the phase reconstruction method through high-temperature melting–cooling technology is a promising strategy for changing the occurrence mode of niobium. However, the effects of oxygen on phase reconstruction are still unclear. In this study, the effects of oxygen on the Nb-bearing phase reconstruction were investigated by turning the oxygen concentration from 0% to 100%. Through adjusting the atmosphere from argon (Ar) into oxygen (O<sub>2</sub>), the enriched phase of Nb was transformed into calciobetafite (Ca<sub>2</sub>(Ti,Nb)<sub>2</sub>O<sub>7</sub>) from loparite ((Ce,Na,Ca)(Nb,Ti)O<sub>3</sub>). In addition, oxygen is beneficial in reducing the content of impurity elements in the pyrochlore-type Ca<sub>2</sub>(Ti,Nb)<sub>2</sub>O<sub>7</sub> phase and improving the co-enrichment of Nb and cerium (Ce). The mechanism of phase transformation under different atmospheres has been discussed through the process of crystallization. In addition, the crystallization of Fe<sub>2</sub>O<sub>3</sub> under a high oxygen concentration provides a clean recovery of iron from tailings. This study found that adjusting the oxygen concentration of the crystallization process is a controllable method of niobium-bearing phase reconstruction. In addition, this study provides useful information for the phase reconstruction of low-grade complicated niobium and rare earth resources.</p></div>\",\"PeriodicalId\":605,\"journal\":{\"name\":\"JOM\",\"volume\":\"77 9\",\"pages\":\"6443 - 6453\"},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2025-07-18\",\"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/s11837-025-07541-6\",\"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/s11837-025-07541-6","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}
Effects of Oxygen on the Phase Reconstruction of Low-Grade Complicated Niobium Resources During Cooling Process
Aiming at the low-grade complicated niobium (Nb) resources in Bayan Obo with complex mineral paragenesis, the phase reconstruction method through high-temperature melting–cooling technology is a promising strategy for changing the occurrence mode of niobium. However, the effects of oxygen on phase reconstruction are still unclear. In this study, the effects of oxygen on the Nb-bearing phase reconstruction were investigated by turning the oxygen concentration from 0% to 100%. Through adjusting the atmosphere from argon (Ar) into oxygen (O2), the enriched phase of Nb was transformed into calciobetafite (Ca2(Ti,Nb)2O7) from loparite ((Ce,Na,Ca)(Nb,Ti)O3). In addition, oxygen is beneficial in reducing the content of impurity elements in the pyrochlore-type Ca2(Ti,Nb)2O7 phase and improving the co-enrichment of Nb and cerium (Ce). The mechanism of phase transformation under different atmospheres has been discussed through the process of crystallization. In addition, the crystallization of Fe2O3 under a high oxygen concentration provides a clean recovery of iron from tailings. This study found that adjusting the oxygen concentration of the crystallization process is a controllable method of niobium-bearing phase reconstruction. In addition, this study provides useful information for the phase reconstruction of low-grade complicated niobium and rare earth resources.
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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