(长沙矿冶研究院， 长沙 410012)
摘 要: 在In-C-O体系中存在C(graphite)， CO(g)，CO2(g)，O2(g)，In(l)， In(g)，In2O(g)和In2O3(s)等物种，反应体系的独立反应数为5。用Mathematica程序求得部分反应的ΔG0，热力学计算得到773～2000K各气相分压与温度的关系，In2O3还原挥发的最低温度是1030K，当T＞974K时，In2O3更容易被C还原，还原为In比还原为In2O容易。结果表明：In2O3还原挥发物的主要成分是In(g)和In2O(g)，当773K＜T＜1529K时，p(In)＞p(In2O)；升高温度对氧化铟的还原挥发有利，p(O2)对p(eff)的影响并不显著。
关键字: 氧化铟；碳；还原挥发；热力学
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
