【摘要】 在实验室用15 kW碳管炉进行碳粉、硅铁粉(75％Si)、碳化硅粉对白钨矿粉(67．25％WO3)还原动力学影响的研究。结果表明,碳还原白钨矿的反应级数为二级,反应表观活化能为234．6 kJ／mol;碳在较低温度下,反应性能差,当温度达到1 400℃时,反应剧烈;随温度升高,硅铁的还原性能比较平稳,反应产生SiO2,使渣量增加;碳化硅高温反应性能好(≥1 400℃);碳和硅铁适合较低合金化率(3％W),碳化硅适宜用于较高的合金化率(≥5％W)。更多还原

【Abstract】 The research of effect of carbon powder, ferrosilicon (75% Si) powder and silicon carbide powder on scheelite (67. 25% WO3) powder reduction kinetics has been carried out by 15 kW carbon tube furnace in laboratory. The results showed that scheelite reduced by carbon was second order reaction and the apparent activation energy was 234. 6 kJ/mol; the reactivity of carbon was poor at low temperature but its reaction rate increased obviously at temperature up to 1 400℃. The reactivity of ferrosilicon was steady with increasing temperature, and reaction product was SiO2 to increase slag amount. The reactivity of silicon carbide was good at temperature≥1 400℃. Carbon and ferrosilicon are available for low alloying ratio (3%W) and silicon carbide is suitable for higher alloying ratio (≥5%W).更多还原