镁基脱硫剂铁水预脱硫综述

对目前几种铁水预脱硫工艺进行了详细比较，对镁粒脱硫工艺的特点及各工艺之间的关系进行了探讨，介绍了该工艺设备及关键的技术问题。     

铁水用金属镁脱硫的热力学分析

计算了分析了镁在铁液中汽化、溶解的热力学行为的镁一硫反应的平衡及其影响因素。     

铁水预脱硫与钢水深脱硫

评述了铁水预脱硫和钢水深脱硫技术及发展,并分析了各种脱硫剂、脱硫工艺,提出了提高脱硫效率的措施。     

铁水预脱硫过程的新概念分析

铁水炉外脱硫是炼钢过程中的一个重要工序，它不仅是产品质量品种要求基本保证，也是生产流程物流调控的“柔性”活套之一，从新的角度讨论了现代钢铁制造流程的铁水脱硫问题，对降低入炉铁水铁含水量，脱硫剂组成，脱硫处理时间，脱硫率和物流调控以及它们之间的相互关系的一些新的概念进行了分析，着重强调了铁水炉外预处理的“柔性”活套功能。     

钙基、镁基脱硫剂的脱硫极限

对喷吹各种钙基，镁基脱硫剂的铁水炉外脱硫体系进行了系统的热力学分析，并通过理论计算得到了各喷吹体系的脱硫极限，理论分析认为，各喷吹体系都有很强的脱硫能力。喷吹Mg/CaO和Mg/CaC2的铁水炉外脱硫体系具有相同的脱硫能力，其脱硫极限可达到10^-7%，从技术经济性及工艺方面考虑，工业生产中喷吹Mg/CaO进行铁水炉外脱硫更合理。     

用铝渣和石灰对铁水预脱硫的热力学

通过热力学计算分析了Al在铁水中与氧和硫反应的平衡活度,当CaO和Al同时加入铁水中,适量的Al会提高CaO的脱硫能力.探讨了在Al的参与下,CaO作为脱硫剂时的脱硫热力学反应机理,以及Al₂O₃和CaF₂对铁水脱硫的作用.     

铁水脱硫的热力学与动力学浅析

叙述了常用铁水脱硫剂的反应及其特点，比较了其脱硫能力；分析了使用不同铁水脱硫剂时影响其反应速度的动力学因素；和添加各类促进剂的作用；提出了提高铁水脱硫效率的措施。籍供铁水炉外喷吹脱硫厂家参考。     

管线钢用铁水预脱硫效果研究

通过试验对管线铜用铁水预脱硫后的效果进行分析,得出了回硫是转炉冶炼管线钢中硫的重要影响因素;铁水包中出铁前加入固硫剂,喷吹镁颗粒完后加入聚渣剂,使得预处理后的顶渣渣系具备了固硫吸硫条件,并且扒渣效果良好,可以有效防止回硫.     

用镁和石灰对铁水脱硫预处理的热力学

由热力学数据计算与MgS、MgO和镁蒸气平衡的铁水中的硫和氧的活度。在Mg和CaO同时喷入铁水时,镁的脱硫能力会增大。以氮作载气,它会与镁生成Mg3N2,但是Mg3N2在高温下也能参与脱硫和脱氧反应。     

铝渣复合脱硫剂在KR铁水脱硫过程中的应用

KR脱硫反应过程中使用纯石灰脱硫剂会生成高熔点硅酸钙覆盖在CaO颗粒表面阻碍脱硫反应进行,以往采用加萤石方法生成低熔点的共晶化合物来解决该问题,但会侵蚀炉衬,且污染环境。使用铝渣后,Al可以和CaO中被置换出的O结合生成Al_2O_3,促进脱硫反应进行,并且可以减少高熔点硅酸钙的生成量。利用工业试验研究加入铝渣对铁水脱硫反应的影响,并利用热力学计算阐述其作用机理。结果表明:加入铝渣后,脱硫反应开始阶段生成Al_2O_3和CaS,随着反应深入,生成的Al_2O_3与CaO结合生成钙铝酸盐,反应产物按照"Al_2O_3→CA6(CaAl_(12)O_(19))→CA_2(CaAl_4O_7)→CA(CaAl_2O_4)→C_3A(Ca_3Al_2O_6)"路径依次生成转变。铝渣中的金属铝可以降低铁水氧势,促进脱硫反应进行,并且铝渣中的Al_2O_3会和CaO反应生成低熔点的钙铝酸盐。使用铝渣后铁水硫质量分数均值可降至4.6×10~(-6),硫质量分数低于10×10~(-6)的比例提升至81.9%。     

Study of MgO-Based Desulfurizer in Hot Metal Desulfurization

This paper has investigated a new desulfurizer for iron and steel industry to make up the lackness of magnesium-based desulfurizer. In order to explore the desulfurization process of hot metal by the new desulfurizer, both the thermodynamics and experiments have been studied.. The results of thermodynamics indicated that, under the standard condition,the lowest reaction temperatures of MgO + C and MgO +Si were 1846℃ and 2132℃ and the pressure of Mg vapor at the hot metal temperature were 0.2-0.5kPa and 0.005-0.01kPa, respectively. In the case of reaction between MgO and Al, the calculated starting reaction temperature under standard condition was 1475 ℃, and the pressure of Mg vapor was distributed from 27 kPa to 45kPa at the hot metal temperature, showing that it was easy to happen the reaction of MgO+Al. The experimental results displayed that the desulfurization efficiency was only 42.31% by the desulfurizer of MgO and C, while the effect of MgO+ Al and MgO+ Al-Si was good, since the desulfurization efficiencies were above 85%, and the lowest sulfur content was below 40×10-6.     

高硫铁水脱硫工艺及高效脱硫剂试验研究

煤基直接还原钒钛磁铁矿新工艺流程得到的含钒铁水,其硫含量高,铁水脱硫负荷大。采用Kr法处理铁水,选用镁钙基材料为脱硫剂,辅以多种添加剂作为脱硫组元,优化机械搅拌工艺,使铁水脱硫效率、脱硫合格率均达到90%以上。     

无氟型KR铁水脱硫剂脱硫效果实验分析

为开发无氟型KR铁水脱硫剂,对铁水脱硫反应进行了机理分析,得知脱硫剂中加入Al后能够促进脱硫反应进行.在此基础上配制了无氟型KR脱硫剂,并对搅拌时间、脱硫剂加入量、铝配比、石灰粒度及铁水温度对脱硫率的影响进行了实验研究,为工业无氟型KR脱硫剂的开发应用提供参考.     

Study of New Hot Metal Desulfurization Process on 1t Desulfurization Experiments

For the lack of the present hot metal desulfurization processes in iron and steel industry, our group has proposed the in-situ mechanical stirring method for external desulfurization of molten iron and researched this new method. This paper investigated this new in-situ mechanical stirring hot metal desulphurization process on desulphurization experiments of one-ton scale by using the new desulfurizer. The experimental results indicated that the desulfurization efficiency of in-situ mechanical stirring desulfurization process is 90% and the lowest sulfur content in the treated hot metal is 23ppm. By comparing with the methods of direct throwing desulfurizer and in-situ injecting desulfurization, in-situ mechanical stirring desulfurization process is the suitable desulfurizaton method.     

Development of Slag Recycling Process in Hot Metal Desulfurization with Mechanical Stirring

In order to develop an environment‐friendly steelmaking process, a slag recycling process for hot metal desulfurization by mechanical stirring was designed. The process was developed with 70 kg‐scale hot metal experiments and actual plant tests. The recycled slag has a 70% desulfurization ability compared with that of virgin flux (CaO‐5%CaF₂). The lower efficiency of the recycled slag was caused by SiO₂ contamination carried over from the previous process. There is no particular size requirement for the recycled slag, as the effect of the recycled slag size on the desulfurization ability is small. The ratio of CaO in the recycled slag to total CaO should be less than 60% in order to prevent an increase in the amount of slag. Slag recycling operation can be repeated more than twice when the optimum conditions are applied. The slag recycling process was established in an industrial operation, and consumption of desulfurization flux decreased by 40% with the process compared with that without slag recycling. Slag hot recycling was adopted at another plant where consumption of desulfurization flux decreased by 50% compared to operation without slag recycling. The positive effect of hot slag recycling is estimated to be a result of the temperature of the recycled slag.     

铁水纯镁脱硫工艺研究及应用

对120t铁水罐喷吹纯镁脱硫工艺进行了优化研究,结合实验室石灰石脱硫结果,确定了工业生产脱硫应采取的措施,如提高钝化镁粉纯度、控制喷枪插入深度、连续少量投放石灰石及喷枪气化室维护等。结果表明,镁利用率提高了8％,一次扒渣后硫含量范围为0．005％～O．010％。     

钙基脱硫剂盛钢桶内脱硫的应用

通过对盛钢桶加入钙基脱硫剂后钢水和钢水渣中的硫含量分析,总结出加入钙基脱硫剂的实用性.实践证明,无论在硫含量高低的情况下加入钙基脱硫剂都对钢水减少硫含量和抑制回硫有显著的效果.     

铁水脱硫用钙镁系粉剂的研究

论述了钙镁系粉剂在铁水脱硫过程中的反应机理及其优点,并提出了提高脱硫效率的途径。