摘要
对联还原锆英石中SiO2进行了温度、配碳量、时间和粒度的实验研究，得到相应的脱硅率的影响规律．建立了Si-C－O系中C－CO型优势图，讨论了SiO分压和StO2活度等对脱硅率的影响，得到温度与StO2最低含量的理论关系．配碳量为7．5％时的脱硅率达到极大值97．22％，在1873～2273K温度范围内的化学反应表现活化能为282．0kJ／mol。
The influences aboat temperature, carbon content, reduction time, particle size and form of samples on SiO2 reduction in zircon have been studied and the changing patterns of desilicating rate has been deduced. The C-CO predominance diagram theory established is qulte well in explaining the experiment results, which the partial pressure of the SiO[P(sio)] and the activity of SiO2 influence the desilicating rate, and the lowest content of SiO2 is related to temperature. When carbon content of samples is 7.5%, the desilicating rate reaches the highest value (97.22%), the apparent reactive energy of zircon reduction is 282.0 kJ/mol in temperature between 1 873 K and 2 273 K, the determining step of reduction is heat decomposition of zircon,
出处
《化工冶金》
CSCD
北大核心
1996年第3期189-195,共7页
基金
国家科委"八五"科技攻关课题
