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2025 Vol.34, Issue 6 Preview Page

Research Paper

Magnetizing Roasting Characteristics to Enhance the Magnetic Separation Efficiency of Titanium Ore from the Taebaek Myeon-san Layer Titanium Deposit

태백 면산층 타이타늄 광석의 자력선별 효율 향상을 위한 자화배소 특성 연구

Fausto Moscoso Pinto1
,
Seongho Lee1
,
Hyung-Seok Kim1*
모스코소 핀토 파우스토1
,
이 성호1
,
김 형석1*
1Korea Institute of Geoscience and Mineral Resources
1한국지질자원연구원
*Corresponding Author
31 December 2025. pp. 94-107
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Abstract

This study aimed to enhance the grade and yield of titanium oxide through magnetic separation of titanium ore from the Taebaek Myeon-San Layer titanium deposit, which contains non-magnetic rutile. The magnetizing roasting characteristics of the ore and the magnetic separation properties of the roasted product were investigated. The titanium ore in the Myeon-San Layer deposit is a sedimentary rock in which the target mineral, rutile (TiO2), is intergrown with hematite (Fe2O3) and gangue minerals, including quartz (SiO2) and clay minerals. Consequently, there are limitations to improving the grade and yield of titanium oxide using conventional beneficiation methods. When graphite, a reducing agent, was added to the titanium ore at levels of 10-30 % and the mixture was roasted at temperatures between 900 and 1,100 °C, the rutile reacts with hematite in the 925 to 975 °C range, transforming them into titanomagnetite (a solid solution of Fe2TiO3 and Fe3O4), a weakly magnetic mineral, and ilmenite (FeTiO3), a paramagnetic mineral. The excess hematite was reduced to magnetite (Fe3O4), a ferromagnetic mineral. However, at temperatures above 1,000 °C, these minerals were reduced again to rutile and metallic iron (Fe). Magnetic separation during synthesis indicated that rutile was not recovered because it is nonmagnetic. Nevertheless, magnetite was recovered at over 90 % using a magnetic field of 0.1 T, titanomagnetite at 1.0 T, and ilmenite at 1.2 T, confirming that titanomagnetite and ilmenite, as roasted products, exhibit high magnetic sensitivity. During magnetic separation at 0.8 T for products roasted at 900-1,050 °C, titanomagnetite and ilmenite, which are titanium-bearing minerals, were recovered as magnetic concentrates. Therefore, when titanium ore from the Myeon-San Layer deposit is mixed with a reducing agent, roasted, and separated by magnetic separation, the non-magnetic rutile reacts with hematite to form titanomagnetite and ilmenite with high magnetic sensitivity. This demonstrates that the yield of titanium oxide can be increased.

Keywords
Myeon-San Layer Titanium Deposit
magnetizing roasting
rutile
magnetic separation
mineral processing

본 연구는 비자성인 금홍석을 함유한 태백지역 면산층 타이타늄 광석으로부터 자력선별에 의해 산화티탄의 품위 및 실수율을 향상시키는 목적으로 타이타늄 광석의 자화배소(Magnetizing roasting) 및 자화배소 산물의 자력선별 특성을 알아보았다. 왜냐하면 면산층 타이타늄 원광은 목적광물인 금홍석(TiO2)이 수반광물인 적철석(Fe2O3), 그리고 맥석광물인 석영(SiO2) 및 점토광물 등이 미세한 입자로 혼합된 퇴적암이기 때문에 전통적인 선광방법으로는 산화티탄 성분의 품위 및 실수율을 향상시키는데 한계성이 있기 때문이다. 타이타늄 광석에 환원제인 흑연을 10~30 % 범위로 혼합하여 900~1,100 °C의 온도범위에서 자화배소한 결과, 925~975 °C의 온도범위에서 타이타늄 광석 내 금홍석은 적철석과 상호반응하여 약자성체인 티타노마그네타이트(Titanomagnetite; Fe2TiO3와 Fe3O4의 고용체)와 상자성체인 티탄철석(ilmenite; FeTiO3)으로 변질되었고, 잉여의 적철석은 강자성체인 자철석(Magnetite; Fe3O4)로 환원되었다. 그러나 1,000 °C 이상에서 이들 광물은 다시 금홍석과 금속철(Metallic Fe)로 환원되었다. 자화배소 산물들을 합성하여 자력선별한 결과, 금홍석은 자력감응도가 전혀 없어 회수되지 않지만, 자철석은 0.1 T 이상에서 티타노마그네타이트는 1.0 T 이상에서 티탄철석은 1.2 T 이상에서 90 % 이상 회수되어 자화배소 산물인 티타노마그네타이트 및 티탄철석의 자력감응도는 높은 것으로 확인되었다. 면산층 타이타늄 광석을 900~1,050 °C의 온도범위에서 자화배소한 결과, 함 티탄광물인 티타노마그네타이트와 티탄철석이 생성되었고, 이들 자화배소 산물을 0.8 T로 자력선별한 결과, 티타노마그네타이트와 티탄철석이 자선정광으로 효율적으로 회수되었다. 따라서 면산층 타이타늄 광석에 환원제를 혼합하여 자화배소하면 광석 내 비자성의 금홍석이 적철석과 반응하여 자력감응도가 높은 티타노마그네타이트와 티탄철석으로 변질되기 때문에 자력선별만으로 산화티탄의 품위 및 실수율을 향상시킬 수 있는 가능성을 확인할 수 있었다.

키워드
태백 면산층 타이타늄 광상
자화배소
금홍석
자력선별
선광공정
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Information
  • Publisher :The Korean Institute of Resources Recycling
  • Publisher(Ko) :한국자원리싸이클링학회
  • Journal Title :Resources Recycling
  • Journal Title(Ko) :자원리싸이클링
  • Volume : 34
  • No :6
  • Pages :94-107
  • Received Date : 2025-11-20
  • Revised Date : 2025-12-17
  • Accepted Date : 2025-12-19
  • DOI :https://doi.org/10.7844/kirr.2025.34.6.94
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