熔渣CaO-SiO2-Al2O3与铁液Fe-Si-C间相平衡的预测

来源期刊:中南大学学报(自然科学版)2015年第3期

论文作者:陶东平 刘振楠 李亚育

文章页码:794 - 804

关键词:渣-铁相平衡;高炉冶炼;分子相互作用体积模型;预测

Key words:phase equilibrium of slag-metal; blast furnace smelting; molecular interaction volume model; prediction

摘    要:应用分子相互作用体积模型(MIVM)对熔渣CaO-SiO2-Al2O3与铁液Fe-Si-C体系之间的相平衡进行预测。研究结果表明:铁液中Si活度及其平衡浓度、熔渣中SiO2活度的预测值均与实验数据较符合,并且在1 693 K和 1 773 K下Fe-Si-C熔体中Si活度的MIVM预测平均相对误差为9%,而Wagner公式的平均相对误差为56%;采用MIVM及其伪多元法预测在1 873 K下铁液中Si平衡浓度的平均相对误差为17%,而采用Wagner公式及SiO2的实验活度所计算的平均相对误差为41%,这表明MIVM的预测效果具有较强的稳定性和可靠性;该模型仅通过拟合子二元系活度或者直接由无限稀活度系数,就能够预测三元液态合金和氧化物熔体的热力学性质。

Abstract: Phase equilibrium between the CaO-SiO2-Al2O3 molten slag and the Fe-Si-C iron melt was predicted based on the molecular interaction volume model (MIVM).The results indicate that the predicted activities and equilibrium contents of Si in the iron melt and the predicted activities of SiO2 in the slag are in good agreement with experimental results. The average relative error of activity of Si in the Fe-Si-C melt predicted by MIVM is 9% at 1 693 K and 1 773 K, while the average relative error of activity of Si calculated by Wagner formula is 56%.The average relative error of the equilibrium contents of Si in the iron melt predicted by both MIVM and its pseudo-multicomponent approach is 17% at 1 873 K, while the average relative error of equilibrium contents of Si calculated by using both the Wagner formalism and the experimental activities of SiO2 is 41%, which shows that the prediction effect of the proposed method is of better stability and reliability. A significant advantage of the model lies in its ability to predict thermodynamic properties of ternary liquid alloys and molten slags by only using the experimental results of component activities or infinite activity coefficients in their sub-binary systems.

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