(北京科技大學(xué) 冶金與生態(tài)工程學(xué)院 生態(tài)與循環(huán)冶金教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083)
摘 要: 依據(jù)化學(xué)中廣泛應(yīng)用的同系線性規(guī)律，擬合鈣、鎂復(fù)合化合物標(biāo)準(zhǔn)反應(yīng)吉布斯自由能之間的線性關(guān)系式，然后由3CaO·B2O3和2CaO·B2O3的標(biāo)準(zhǔn)反應(yīng)吉布斯自由能求得3MgO·B2O3和2MgO·B2O3的標(biāo)準(zhǔn)反應(yīng)吉布斯自由能，進(jìn)而基于爐渣結(jié)構(gòu)的共存理論和相圖，推導(dǎo)MgO-B2O3二元渣系的熱力學(xué)計(jì)算模型。結(jié)果表明：1 460 ℃時(shí)，在濃度為0.45＜x(MgO)＜0.80的范圍內(nèi)，理論計(jì)算的MgO-B2O3渣系的作用濃度N(B2O3)的變化規(guī)律與實(shí)測活度α(B2O3)是相同的，且擬合較好。
關(guān)鍵字: 爐渣；共存理論；質(zhì)量作用濃度；活度；同系線性規(guī)律
MgO-B2O3 slag melt
（Key Laboratory of Ecological and Recycle Metallurgy, Ministry of Education,
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:According to the homologous linear rule, which was applied widely in the chemistry area, the linear equation between the standard reaction Gibbs free energy of calcium and magnesium composite compounds was fitted out. The standard reaction Gibbs free energy of 3MgO∙B2O3 and 2MgO∙B2O3 were obtained from the reaction of 3CaO·B2O3 and 2CaO·B2O3. And then, the thermodynamic calculation model was deduced for MgO-B2O3 slag melt based on the coexistence theory of slag structure and phase diagram. The calculated results indicate that the variation trend of theoretically calculated mass action concentrations of B2O3 agrees well with the measured activities in the reference at 1 460 ℃ in the concentration range of 0.45＜x(MgO)＜0.80. Therefore, this above mentioned model has a certain extent of instruction meaning for actual work.
Key words: slag; coexistence theory; mass action concentration; activity; homologous linear rule
