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Relationship between Thermodynamic Parameters for Mn-Fe Melt and Temperature

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Journal of Iron and Steel Research International 2004年第3期11卷 5-10页

作者： CHEN Er-bao dong yuan-chi GUO Shang-xing WU Bao-guo Anhui University of Technology

The carbon solubility in Mn-Fe melts were measured at 1350℃,1375℃,1425℃and 1450 ℃,and accordingly the calculated equations were *** thermodynamic derivation and calculation,some relationships between thermodynamic... 详细信息

关键词： Mn-Fe melt thermodynamic parameter temperature activity interaction coefficient

Performance of Low Fluoride Dephosphorization Slag of Hot Metal

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Journal of Iron and Steel Research International 2011年第1期18卷 11-15页

作者： LIU Li-xia WANG Shi-jun dong yuan chi JIA Xiao-hui School of Material and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China School of Metallurgy and Resource Anhui University of Technology Ma'anshan 243002 Anhui China School of Materials Science and Engineering Central South University Changsha 410083 Hunan China

The purpose of the study is to decrease content of CaF2 in dephosphorization slag. The dephosphorization effects of CaF2 replaced by B2O3 were investigated. The dephosphorization experiments were carried out at 1 450 ℃ in air atmosphere. The results show that the melting points and dephosphorization ratios change little when CaF2 was replaced by B2O3. The dephosphorization ratios are all greater than 80% and melting points can meet the requirement of hot metal pretreatment. Because of the change of alkalinity caused by B2 03, the oxidation of slag increases with increasing of B2 Oa contents. It is beneficial to pre-dephosphorization. As a result, for decreasing its pollution, CaF2 can be replaced by B2Oa to dispose fluoride-free pre-dephosphorization slag.

关键词： low fluoride slag hot metal pretreatment dephosphorization phosphate capacity

Vacuum Treatment for Simultaneous Desulphurization and Dephosphorization of Hot Metal and Molten Steel

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Journal of Iron and Steel Research International 2004年第2期11卷 14-17页

作者： WANG Hai-chuan WANG Shi-jun ZHOU Yun WU Bao-guo dong yuan-chi Anhui University of Technology

The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried *** pre-treatment of hot metal,both desulphurization and dephosphorization are improved with the increase of CaO in slag,but deteriorated with the increase of CaF2 in *** average desulphurization and dephosphorization rate is 68.83 % and 78.46 %,*** molten steel,the substitution of BaO for CaO in slag has minor effect on simultaneous desulphurization and *** desulphurization and dephosphorization rate is higher than 90% and 50% respectively with the lowest final sulfur and phosphorus mass percent being 0.001 2% and 0.010%,*** overall effect of simultaneous desulphurization and dephosphorization of molten steel is better than that of hot metal.

关键词： hot metal molten steel desulphurization dephosphorization CaO-based slag vacuum treatment

Effect of Top Slag Basicity on Quality of Steel Treated by Exothermic Agent SiFe and SiCaBa during Chemical Heating

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Journal of Iron and Steel Research International 2002年第1期9卷 12-15页

作者： WANG Hai-chuan ZHOU Yun WANG Shi-jun YUE Ke-xiang dong yuan-chi Anhui University of Technology

The effect of top slag basicity on quality of steel treated with SiFe and SiCaBa alloy as exothermic agent in chemical heating was *** experiments were carried out in MoSi_2 laboratory furnace with 0.2 kg molten steel for equilibrium test and 2 kg molten steel for simulation test *** results showed that the adjusting basicity of top slag with CaO is effective to prevent rephosphorization and resulphurization,and it is possible to dephosphorize and desulphurize and remove the inclusions from molten steel when basicity R of the top slag is adjusted to 2.0 — 3.10,and SiCaBa alloy is better than SiFe alloy in this relation.

关键词： chemical heating top slag basicity SiFe SiCaBa exothermic agent

Mathematical Simulation of Flow Phenomena in CAS-OB Refining Ladle

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Journal of Iron and Steel Research International 2003年第4期10卷 8-12页

作者： ZHOU Yun dong yuan-chi WANG Hai-chuan WANG Shi-jun LIU Yong-bing Anhui University of Technology

The deoxidation behaviors of alloys bearing barium in pipe steel were researched with MgO crucible under argon atmosphere in MoSi 2 furnace at 1 873 K. The total oxygen contents of molten steel, the distribution, size and morphology of deoxidation products in the steel were surveyed. The metamorphic mechanism for deoxidation products of alloy bearing barium was also discussed. The results show that applying alloy bearing barium to the pipe steel, very low total oxygen contents can be obtained, and deoxidation products, which easily float up from molten steel, can be changed into globular shape and uniformly distributed in steel. The equilibrium time of total oxygen is about 25 min, and the terminal total oxygen contents range from 0 002 0 % to 0 002 2 % after treating with SiCa wire. The best deoxidizers are SiAlBaCa and SiAlBaCaSr.

关键词： alloy bearing barium deoxidation complex deoxidizer inclusion

Thermodynamic Properties of Fe-C-N and Fe-C-B-N Melts

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Journal of Iron and Steel Research International 2007年第1期14卷 21-24页

作者： CHEN Er-bac WANG Shi-jun dong yuan-chi WU Bao-guo ZHOU Yun School of Metallurgy and Materials Anhui University of Technology Ma＇anshan 243002 Anhui China

The saturated solubility of carbon and nitrogen in Fe-C-N and Fe-C-B-N melts was measured experimentally at 1 485℃ to obtain the activity interaction coefficients between components in these melts. A new method was used to treat experimental results. Using thermodynamic derivation and calculation, some important interac- tion coefficients between components in these melts were obtained.

关键词： Fe-C-N melt Fe-C-B-N melt Fe-C-B melt interaction coefficient thermodynamic property

Model of Calculating Activity of Nitrogen and Vanadium in Fe-C-V-N Molten Metal

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Journal of Iron and Steel Research International 2008年第5期15卷 19-23页

作者： PENG Jun WANG Shi-jun dong yuan-chi LIU Li-xia ZHOU Yun CHEN Er-bao School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 Beijing China School of Metallurgy and Resource Anhui University of Technology Ma＇anshan 243002 Anhui China

The solubility of nitrogen in the Fe-C-V-N system was measured at 1 708 K and the model of calculating activity （action concentration） of nitrogen （N） and vanadium （V） was derived according to the phase diagram and the coexistence theory of the metal melt structure. The solubility expression of nitrogen in the Fe-C-V-N system at 1 708 K was ωN =0. 058 194-0. 010 367ωc＋0. 005 543 4ωv. Comparing the computing results with the experimental resuits, a satisfactory conclusion could be obtained. The analysis of the Fe-C-V-N system using this model showed that VN was present in a high temperature metal melt, which would reduce the action concentration of nitrogen obviously. It was consequently disadvantageous to the removal of nitrogen from hot metal.

关键词： metal melt coexistence theory action concentration activity

Thermodynamic Model for Calculating Activity of Nitrogen and Boron in Fe-C-B-N Molten Metal

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Journal of Iron and Steel Research International 2009年第3期16卷 15-19页

作者： WANG Shi-jun PENG Jun dong yuan-chi LIU Li-xia ZHOU Yun CHEN Er-bao School of Metallurgy and Resource Anhui University of Technology Maranshan 243002 Anhui China School ofMetallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The solubility of nitrogen in Fe-C-B-N system was measured at 1 758 K,and the computational model on activity （action concentration） of nitrogen and boron was established based on phase diagram and the coexistence theory about metal melt structure model. Comparing the computed results with the experimental results,satisfactory conclusion can be obtained. The result shows that BN and B4C can exist in Fe-C-B-N molten metal at high temperature,which consequently restrains the nitrogen removal from the melt. However,B4C content is extremely low. Before graphite is precipitated,the influence of carbon on activity of nitrogen in melt is higher in ternary system than in binary system; however,this effect is contrary to that after graphite is precipitated.

关键词： molten metal coexistence theory action concentration activity

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纳米硅酸铝粉体制备及影响因素分析

过程工程学报 2007年第3期7卷 546-550页

作者：李辽沙李洪花王梅朱静董元篪安徽工业大学安徽省冶金工程与资源综合利用重点实验室安徽马鞍山243002

以含铝工业废液为原料,通过控制反应条件与添加适当的表面修饰剂制备得到纳米级硅酸铝粉体.采用化学分析、SEM、比表面积测定、分光光度测定等手段对样品的理化特性进行了表征.结果表明,加料与混合方式是影响目标产品性质的关键因素.以... 详细信息

以含铝工业废液为原料,通过控制反应条件与添加适当的表面修饰剂制备得到纳米级硅酸铝粉体.采用化学分析、SEM、比表面积测定、分光光度测定等手段对样品的理化特性进行了表征.结果表明,加料与混合方式是影响目标产品性质的关键因素.以向水玻璃中滴加废液的方式进行反应,并控制陈化pH值为4.5左右,所得的样品颗粒粒径分布均匀,且各项化学指标均符合中国企业通用标准.修饰剂PEG和Tween-80通过空间位阻作用都能防止颗粒的团聚,但添加Tween-80更佳,其用量为0.9%(占最终干燥样品的质量百分数).终极样品的平均粒径为40～50nm,比表面积约达330m2/g.

关键词：纳米硅酸铝含铝废液制备影响因素