碳还原锆英石分离SiO_2和ZrO_2

Separation of SiO_2, and ZrO_2 from Zircon by Carbon-Reduction

进行了配碳量、温度、时间和颗粒大小及试样形式对碳还原锆英石中ＳｉＯ２的实验研究，得到相应脱硅率的影响规律。理论上，脱硅率的极大值可达到９７．２２％。碳还原锆英石的表现反应活化能，在１６００～２０００℃温度范围内为２８２．０４ｋＪ／ｍｏｌ。锆英石被碳还原的限制环节是锆英石的热分解，而不是它裂解成ＳｉＯ２之后再与碳的反应。

The influence of carbon content, temperature, time, particle size and from of samples on the reduction of SiO2 by carbon in zircon were studied. The effects of these factors on the ratio of desilica from zircon were obtained. The maximum value of this ratio could reach to 97.22% theoritically. The apparent activation energy for the reaction of zircon with carbon was 282.04 kJ/mol (1600～2000℃) .Besides, the limiting step of reduction of SiO2 in zircon was the heat decomposition of zircon, not the reaction of SiO2 with carbon after decompostion of zircon.