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Super High Cleaning of Steel and Miniaturization of Inclusions by Deoxidation of Molten Iron with Magnesium Vapor In Situ Produced

原位产生镁蒸气铁水脱氧对钢的超高洁净度和夹杂物的微细化

基本信息

批准号：
16360372
负责人：
KUWABARA Mamoru
金额：
$ 8.45万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

Desulfurization and deoxidation of molten iron with magnesium vapor produced in situ by aluminothermic reduction of magnesium oxide were studied by combining high temperature and water model experiments. Removal and miniaturization results and formation mechanism of deoxidation product MgO were investigated. Furthermore, resulfurization in desulfurization process with Mg vapor and mechanism of aluminothermic reduction of MgO were also studied.1. High temperature experiment of deoxidation of molten steel with Mg vapor was conducted. Behavior of deoxidation product was studied. The inclusions formed after present dioxidation process was in spherical shape with a diameter of only about 1μm. Most of the deoxidation products were removed by rising Ar+Mg bubbles. The effects of various operating parameters on deoxidation rate and inclusion behavior were clarified. The composition and distribution of inclusion in steel were made clear by observation and analysis of inclusions remained in the … More steel.2. The combining deoxidation of molten steel with Al and in situ, produced Mg vapor was carried out. Most of the inclusions had the composition of Al_2O_3 in their core and the composition of MgO or MgO・Al_2O_3 on their exterior shell. These kinds of inclusions are difficult to aggregate and the formation of Al_2O_3 cluster is therefore prevented.3. The water model experiment was conducted to study collision and attachment of inclusions to rising bubbles and absorption of inclusions by slag with the aid of high speed camera. Effects of various operating parameters on collision and attachment of inclusions to the rising bubbles were clarified.4. Resulfurization in desulfurization process with in situ produced Mg vapor was studied. The mechanism of resulfurization was elucidated. And addition of CaO and the activated charcoal powders onto the melt surface were proposed to prevent resulfurization.5. Microscopic observation of aluminothermic reduction of MgO showed that the reduction proceeded along with penetration of molten aluminum into MgO phase after breakup of the Al_2O_3 film on Al particles. Less

采用高温和水模型实验相结合的方法，研究了氧化镁铝热还原原位生成的镁蒸气对铁液的脱硫脱氧作用。研究了脱氧产物MgO的脱除、细化效果及形成机理。此外，还研究了镁蒸气脱硫过程中的回硫作用和铝热还原MgO的机理.进行了镁蒸气对钢液脱氧的高温试验。研究了脱氧产物的行为。二次氧化后形成的夹杂物呈球形，直径仅1μm左右。大部分脱氧产物通过上升的Ar+Mg气泡去除。阐明了各种操作参数对脱氧速率和夹杂物行为的影响。通过对钢中残留夹杂物的观察和分析， ...更多信息钢铁2.研究了钢液加铝和原位生成镁蒸气联合脱氧的工艺。夹杂物的核心成分主要为Al_2O_3，外壳成分主要为MgO或MgO·Al_2O_3。这类夹杂物不易聚集，从而防止了Al_2O_3团簇的形成.通过水模型实验，借助高速摄像机研究了夹杂物与上升气泡的碰撞、附着以及炉渣对夹杂物的吸收。研究了各操作参数对夹杂物与上升气泡碰撞和附着的影响.研究了原位生成镁蒸气脱硫过程中的回硫作用。阐明了硫化机理。并提出了在熔体表面添加CaO和活性炭粉来防止回硫的方法.对MgO铝热还原过程的微观观察表明，在Al颗粒表面的Al_2O_3膜破裂后，还原过程沿着铝液向MgO相的渗透。少