Global annual production of niobium is only around 100,000 tonnes; however, it is a critical metal for modern industry and is mined in only a limited number of regions. This study reviews the current status of niobium smelting and recycling technologies. Approximately 90% of niobium is produced as ferroniobium (FeNb) for use in steel alloys, although niobium is also utilized in superalloys, superconductors, capacitors, semiconductors, and other applications. Niobium coexists with tantalum in columbite and tantalite ores. These ores are decomposed by hydrofluoric acid digestion or alkali fusion, followed by solvent extraction to separate Nb2O5 and Ta2O5. Niobium metal and FeNb are produced from Nb2O5 primarily via aluminothermic reduction, although metallic niobium can also be manufactured by thermal reduction using Mg, Ca, or C, as well as by molten salt electrolysis. Crude niobium is subsequently refined into high-purity niobium through molten salt electrolytic refining, high-temperature vacuum treatment, and electron beam melting. Because most niobium is used as an alloying element in stainless steel and high-strength low-alloy steel, recycling practices for niobium remain poorly documented.

1. Introduction 
2. 나이오븀의 생산량과 용도 
3. 나이오븀의 제련 
    3.1 나이오븀의 원료 
    3.2 광석의 분해 및 Nb2O5와 Ta2O5의 분리 
    3.3 Nb 산화물의 환원 
    3.4 Nb 할로겐화물의 환원 
    3.5 페로나이오븀(FeNb)의 제조 
    3.6 금속 나이오븀의 정제 
4. 나이오븀의 리사이클링 
5. Conclusion 
Funding
Conflict of Interest 
Data Availability Statement 
Author Information and Contribution 
Acknowledgments
References

• 손호상(경북대학교 금속재료공학과) | Ho-Sang Sohn (Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu 41566, Korea) Corresponding author