(1. 重慶大學(xué) 國家鎂合金材料工程技術(shù)研究中心，重慶 400030；
2. 重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400045)
摘 要: 采用熱力學(xué)方法計算并分析真空硅熱法煉鍶的反應(yīng)自由能和臨界還原溫度。結(jié)果表明，造渣反應(yīng)和真空工藝可有效降低反應(yīng)自由能，并可將反應(yīng)臨界溫度由標準狀態(tài)下的2 876 K降低到1 100 K以下。通過真空硅熱法煉鍶實驗獲得純度(質(zhì)量分數(shù))為98.53%的金屬鍶，鍶的收得率為55%。經(jīng)XRD技術(shù)分析，反應(yīng)后殘留渣團的主要成分為2SrO∙SiO2，并摻有少量的SrO∙SiO2。
關(guān)鍵字: Sr；真空硅熱法；熱力學(xué)；造渣反應(yīng)；應(yīng)用性
（1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, China;
2. College of Material Science and Engineering, Chongqing University, Chongqing 400045, China）
Abstract:The Gibbs free energy and critical reduction temperature of vacuum silicothermic reduction producing metallic strontium were calculated and analyzed by thermodynamics. The results show that the slagging reactions and vacuum technique can lower the Gibbs free energy of the reduction reactions obviously and the critical temperature decreases from 2 876 K to below 1 100 K. Through the experiment of vacuum silicothermic reduction producing metallic strontium, the pure metallic Sr (98.53%, mass fraction) is obtained and the metal yield is 55%. Through XRD analysis, the main compound in the reaction slag is 2SrO∙SiO2, accompanied by a little amount of SrO∙SiO2.
Key words: Sr; vacuum silicothermic reduction; thermodynamics; slagging reaction; applicability
