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한반도 옥천대 탄질이암층중의 저품위 우라늄광의 부존상태 및 우라늄, 바나듐, 몰리브데늄 회수공정개발연구(II) -염배소공정개발-

Uranium Occurrences, and Process Development for Recovering Uranium, Vanadium and Molybdenum from Uranium Ore in Coaly Meta-Pelites in Ogcheon Terrain, Korea(II): - Development of Salt-Roasting Process -

HWAHAK KONGHAK, February 1986, 24(1), 63-72(10), NONE
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Abstract

한국산 저품위 우라늄광의 광물학적 연구는 제1보에서 수행하였고 이를 근간으로 새로운 정련공정을 개발하였다.
유동층 염-배소로에서 10 %의 용융염이 결합액으로 작용하여 미세입자(dp<0.097 cm)들이 집괴-입상화하여 그 크기를 성장시킴으로서 고체입자들의 평균 체류 시간을 30분 까지 연장시킬 수 있었다. 이로 인하여 우라늄 광물내의 탄질물 제거율이 약 95 %이고 동시에 우라늄광의 낮은 발열량(약 1,900 Kcal/Kg)을 최대로 활용활 수 있어 자체 발열량으로 침출 과정에서 유가물질(U, V, Mo)을 분리하기 위한 최적 온도인 850 ℃로 유지시킬 수 있었다.
염-배소 공정은 재래 공정에 비하여 침출 및 고-액 분리 효과가 우수할 뿐만 아니라 우라늄과 함께 부산물로 고가의 바나듐과 몰리브데늄을 동시에 분리 회수할 수 있는 효율적인 정련 공정이다.
A new ore processing is developed based on the mineralogical study of Korean low-grade uranium ore discussed in part I.
The mean residence time of solid particles in a fluidized bed salt-roaster could be increased about 30 minutes as a result of granule formation by agglomeration and growth of fines (dp<0.097 cm) with molten salt of 10 % as binding liquid. In this case the carbon removal efficiency from uranium ore was about 95 % and then the temperature of the roaster could be sustained at 850 ℃, which is optimum to separate valuable materials such as uranium, vanadium, and molybdenum from the roasted ore, with low grade uranium bearing graphitic coal ore. The heating value was found about 1,900 Kcal/Kg of ore.
When compared with conventional processes, the new fluidized salt roasting process is proven as one of the most efficient ore processing technique in aspects of improved leaching and solid-liquid separation efficiency as well as simultaneous recovery of uranium with valuable by-products such as vanadium and molybdenum in low-grade ores.

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