오산화바나듐(V2O5)의 건식 정제에 관한 기초 연구
Fundamental Study on the Pyrometallurgical Purification of Vanadium Pentoxide (V2O5)
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초록
본 연구에서는 오산화바나듐(V2O5)로부터 불순물을 제거하기 위한 건식정제 공정법 중의 하나인휘발정제 방법에 대한 기초연구를 수행하였다. 열역학적 분석결과 오산화바나듐에 함유된 P2O5 불순물은 300°C 이상에서 NaOH와 KOH 같은 불순물은 600°C 이상에서 증기압이 높아 기상으로 휘발 제거가 가능할 것으로 분석되었다. 실험은 대기 분위기와 감압 분위기에서 휘발온도 600 – 1000°C, 유지시간 15 – 60분으로 변화시키면서 수행되었다. 감압은 아르곤 분위기에서 7.9×10 -2 – 1.1×10 -1 기압으로 조절하였다. 열역학적 분석결과와 실험 결과를 비교함으로써 SO3, P2O5, NaOH, KOH 같은 불순물이 로내 압력 조건에 상관없이 효과적으로 오산화바나듐으로부터 제거된다는 것이 확인되었다. 최적 조건에서 99.6 wt% 순도를 갖는 오산화바나듐이 99.2 wt% 순도를 갖는 오산화바나듐으로부터 제조되었다.
Abstract
A fundamental study on the volatilization purification method, a pyrometallurgical purification technology, was carried out to examine the removal of impurities from vanadium pentoxide (V2O5). From the thermodynamic analysis, it was expected that impurities contained in V2O5 could be removed into the gas phase while holding it at temperatures over 300°C for P2O5 and at over 600°C for NaOH and KOH, because of their high vapor pressures. Experiments were carried out in the temperature range of 600–1,100°C and a holding time range of 15–60 min under atmospheric and reduced pressures. The range of reduced pressure was 7.9×10 -2 –1.1×10 -1 atm under an argon atmosphere. By comparing the thermodynamic analysis with the experimental results, it was verified that impurities such as SO3, P2O5, NaOH, and KOH were effectively removed from V2O5 regardless of the pressure conditions of the furnace. At the optimum conditions, V2O5 with a purity of 99.6 wt% was manufactured from V2O5 with a purity of 99.2 wt%.
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