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Comparison of Some Methods on Prediction of Activity Interaction Coefficient

International Journal of Minerals,Metallurgy and Materials 1998年第1期12卷 13-15页

作者： changxiang xiang Ningxin Zhang (Applied Science School, University of Science and Technology Beijing, Beijing 100083, China) Applied Science School University of Science and Technology Beijing Beijing 100083 China

Based on Miedema's semiempirical formation enthalpy model for binary alloys, free volume theory and ageneral solution model, a new model for prediction of activity interaction coefficient ε is proposed. The calculatedresults are better in agreement with the experimental values than the two previous models. The related theories andmodels are discussed according to the degree of agreement with experimental values.

关键词： Miedema's semiempirical formation enthalpy model activity interaction coefficient free volume theory similarity coefficient

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Copper Removal from Molten Steel by Gasification

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Journal of Iron and Steel Research International 1999年第2期6卷 10-13页

作者： Li Liansheng Li Shiqi xiang changxiang Cao Jie Liu Keming Li Suqin University of Science and Technology Beijing

A novel method is proposed to enhance the gasification and removal of copper from molten steel by adding ammonium salts or urea into molten steel under normal *** decopperization experiments were conducted in a molybdenum-wire resistance furnace at 1 873 *** copper content of about 400 g of a mild steel was reduced from 0.49%(mass fraction,the same below) and 0.51% to 0.31% and 0.38% using 0.7 g of NHC1 and 0.5 g of(NH)COrespectively,while the copper content of the molten steel was reduced from 0.61%to 0.56% using 2.00 g of NHCONH.

关键词： molten steel copper removal ammonium salt

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Copper Elimination from the Molten Steel by Addition of Hydronitrogens

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International Journal of Minerals,Metallurgy and Materials 1998年第2期12卷 93-96页

作者： Liansheng Li~(1)) changxiang xiang~(1)) Jie Cao~(1)) Shiqi Ii~(1)) Eiji Ichise~(2)) 1)Applied Science School, UST Beijing, Beijing 100083, China 2) The Kyoto University, Kyoto, Japan Applied Science School UST Beijing Beijing 100083 China Kyoto University Kyoto Japan

A novel method has been proposed to remove copper from molten steel by adding the compounds of hydrogen and nitrogen into the melt at normal pressure. Feasibility experiments were carried out in Mo-wire resistance furnace at 1600℃. The copper content of about 400 g 45 steel were reduced from 0.60% and 0.57% to 0.41% and 0.51% with 3.25g and 1.20 g NH_4Cl respectively, while the copper contents of about 300 g steel melt were reduced from 1.15% and 0.61% to 0.90% and 0.56% with 4.10 g and 2.00 g NH_2CONH_2. These results indicate that the proposed method is very promising to be put into practical and worthwhile of further study.

关键词： molten steel copper removal hydronitrogens

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Fe-La-O-S系平衡的研究

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金属学报 1986年第2期22卷 68-74页

作者：陈冬韩其勇王涛项长祥北京钢铁学院

本实验采用ZrO2（MgO）固体电解质氧浓差电池直接测定氧的活度,用放射性测量技术及低温无水电解分离夹杂的方法,考察了电解分离过程中La2O2S的稳定性并测定了铁液中溶解态的La含量,对实验数据用平衡值外推法处理得到: 1550℃ KLa2O2S=3... 详细信息

本实验采用ZrO2（MgO）固体电解质氧浓差电池直接测定氧的活度,用放射性测量技术及低温无水电解分离夹杂的方法,考察了电解分离过程中La2O2S的稳定性并测定了铁液中溶解态的La含量,对实验数据用平衡值外推法处理得到: 1550℃ KLa2O2S=3.81×10-19 eSLa=-4.1 1600℃ KLi2O2S=6.45×10-19 eSLa=-4.8 1650℃ KLi2O2S=7.41×10-19 eSLa=-4.2 La（1）=[La] △Gsol0=-136700+59.82T,γLa0=0.33（1873K）实验结果表明La具有比Ce,Nd,Y更强的脱硫氧能力。

关键词：平衡常数 MgO Fe-La-O-S 脱硫化工单元操作铁液稀土元素 ⅢB族元素 La 固体电解质

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