【作者】 曹余良；

【导师】 袁守谦； 梁德安；

【作者基本信息】 西安建筑科技大学 ， 钢铁冶金， 2009， 硕士

【摘要】 随着纯净钢冶炼技术的不断进步和对钢水纯净度要求的提高,用户对超低硫钢需求量的不断增大,采用优质精炼渣进行炉外脱硫处理已成为目前国内外许多钢铁厂关注的工艺。根据不同的炉外精炼工艺选择合适的精炼渣成为人们研究精炼渣的热点之一。本研究对脱硫的热力学和动力学进行了分析,在总结前人工作和理论分析的基础上,通过在井式电阻炉的实验,对LF炉用12CaO·7Al₂O₃预熔精炼渣的预熔工艺、脱硫以及吸附非金属夹杂物能力进行了研究。并通过正交实验设计,对12CaO·7Al₂O₃-BaO-MgO-Li₂O-SiO₂无氟精炼渣的脱硫能力进行了实验。在本实验条件下,12CaO·7Al₂O₃具有较强的脱硫能力,钢中初始硫含量为0.030%～0.031%,终点硫含量为0.016%～0.023%,脱硫率为23.33%～48.391%。12CAO·7Al₂O₃-SiO₂-BaO-Li₂O-MgO无氟精炼渣具有更强的脱硫能力,将钢样中0.030%的硫脱除到0.006%,脱硫率高达80.00%,已达到无氟精炼渣脱硫的较高水平。最后,通过正交实验设计,得出LF用12CaO·7Al₂O₃基无氟精炼渣最佳渣系组成:12CAO·7Al₂O₃（%）/SiO₂（%）为9～10,BaO含量15%～20%,MgO含量4%,Li₂O含量3%。LF炉用12CAO·7Al₂O₃基无氟精炼渣,满足无氟的要求,具有良好的环保效果,同时,该渣系原料来源广泛、对炉衬侵蚀小、便于加工和储运。另外,12CaO·7Al₂O₃具有较高含量的CaO和Al₂O₃,能够吸附大量的铝脱氧产物-Al₂O₃,而且在吸附钢液中Al₂O₃夹杂物后,不会造成精炼渣成分波动太大,比较适用于铝脱氧钢。更多还原

【Abstract】 With the progress of the clean steel smelting technique,the requirement increase of the steel with ultralow sulphur content,desulphurization in the secondary refining process with fine refining stags has become a focal problem concerned all over the world.The main purpose is how to choose proper refining slag in accordance to different facility of second refining.According with the study of desulphurization dynamics and thermodynamics, With summarizing research work of the predecessor,through experiments on resistance furnace,there study sintering technology and desulphurization ability and removal non-metallic inclusion ability of refining slag of 12CaO·7Al₂O₃ in ladle furnace.With theoretical analysis,this paper deals with desulphurization ability of free-fluoride refining slag of 12CaO·7Al₂O₃-BaO-MgO-Li₂O-SiO₂.Under the experimental conditions,12CaO·7Al₂O₃ premelted refining slag has high desulphurization ability,the initial sulfur content in steel was in the range of 0.030%～0.031%,the final sulfur content in steel was decreased to the range of 0.016%～0.023%,and the desulpurizaiton ratio was in the range of 23.33%～48.391%.Free-fluoride refining slag of 12CaO·7Al₂O₃-SiO₂-BaO-Li₂O-MgO has perfect desulphurization ability.Under the experimental conditions,the initial sulfur content in steel was 0.030%,the final sulfur content in steel was decreased to 0.006%,and the desulpurizaiton ratio was 80.00%. Under theoretical analysis,the optimal slag composition attained from the experiment was 12CaO·7Al₂O₃（%）/SiO₂（%） 9～10,（BaO%） 15%～20%,（MgO%） 4%,（Li₂O%） 3%.12CaO·7Al₂O₃ base free-fluoride refining slag in ladle furnace has satisfied the requirement of free-fluoride,and which is harmless to the environment.Which we researched has wide resource and low weathering for furnace firebrick lining,its easy to process and transport.12CaO·7Al₂O₃ free-fluoride refining slag high content of CaO and Al₂O₃,can absorb a large number of aluminum deoxidation product of-Al₂O₃,and Al₂O₃ inclusions adsorbed,the composition will not cause substantial fluctuations in refining slag. Comparison of aluminum for deoxidation of steel.更多还原