(東北大學(xué) 材料與冶金學(xué)院冶金與材料化學(xué)系,
沈陽(yáng) 110006)
摘 要: 用熱重法研究了高鈦渣在空氣中的等溫和非等溫氧化動(dòng)力學(xué)。實(shí)驗(yàn)結(jié)果表明，高鈦渣氧化動(dòng)力學(xué)可用縮核模型來(lái)描述。利用等溫動(dòng)力學(xué)模型公式確定等溫氧化初期為化學(xué)反應(yīng)控制，后期為擴(kuò)散控制，計(jì)算得到相應(yīng)的表觀活化能分別為19.62, 30.05kJ/mol；通過(guò)非等溫動(dòng)力學(xué)模型公式確定高鈦渣的非等溫氧化階段Ⅰ為界面化學(xué)反應(yīng)控制，階段Ⅱ?yàn)榻缑婊瘜W(xué)反應(yīng)和擴(kuò)散綜合控制，階段Ⅲ為擴(kuò)散控制，并得到相應(yīng)的表觀活化能。
關(guān)鍵字: 高鈦渣; 氧化; 動(dòng)力學(xué); 熱重分析
titaniferous slag
（School of Materials and Metallurgy,
Northeastern University, Shenyang 110006, China）
Abstract:The isothermal and non-isothermal kinetics of the oxidation of titaniferous slag in air were investigated by the thermal gravimetric technique. The un-reacted-core shrinking model can be used to describe the oxidation process of titaniferous slag. The controlling steps for isothermal oxidation at initial and later stages are judged as chemical reaction controlled and diffusin-controlled step respectively.The apparent activation energies are obtained to be 19.62 kJ/mol and 30.05 kJ/mol by isothermal kinetics model formula. Non-isothermal oxidation stage Ⅰ is chemical reaction controlled, stage Ⅱ is both of chemical reaction controlled and diffiusion controlled, and stage Ⅲ is diffusion controlled.
Key words: titaniferous slag; oxidation; kinetics; thermal gravimetric analysis
