(長沙礦冶研究院， 長沙 410012)
摘 要: 在In-C-O體系中存在C(graphite)， CO(g)，CO2(g)，O2(g)，In(l)， In(g)，In2O(g)和In2O3(s)等物種，反應體系的獨立反應數為5。用Mathematica程序求得部分反應的ΔG0，熱力學計算得到773～2000K各氣相分壓與溫度的關系，In2O3還原揮發(fā)的最低溫度是1030K，當T＞974K時，In2O3更容易被C還原，還原為In比還原為In2O容易。結果表明：In2O3還原揮發(fā)物的主要成分是In(g)和In2O(g)，當773K＜T＜1529K時，p(In)＞p(In2O)；升高溫度對氧化銦的還原揮發(fā)有利，p(O2)對p(eff)的影響并不顯著。
關鍵字: 氧化銦；碳；還原揮發(fā)；熱力學
deoxidization and volatilization
of In2O3
（Changsha Research Institute of Mining and Metallurgy，
Changsha 410012，China）
Abstract:There are eight species in the system In-C-O. The number of the independent reactions is five. The Gibbs' free energy changes of partial reactions were gained by Mathematica program designed. The relations between the partial pressure of each gas and temperature were achieved. The deoxidization and volatilization of In2O3 can't occur spontaneously until the temperature reaches 1030K. Beyond 974K，In2O3 can be deoxidized by Ceasilier than by CO and deoxidized to In easilier than In2O. The results show that In(g) and In2O(g) are the main gaseous species over In2O3. The volatilization rate of In2O3 rises along with the temperature. p(eff) is affected by p(O2) is not so markedly.
Key words: In2O3；C；deoxidization and volatilization；thermodynamic
