STUDY ON IMPROVING DEGASSING EFFICIENCY OF IRON MELT WITH VACUUM SUCTION DEGASSING METHOD

真空抽吸脱气法提高铁水脱气效率的研究

基本信息

批准号：
06555221
负责人：
SANO Masamichi
金额：
$ 4.74万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

Experimental studies on decarburization, dehydrogenization and dcoxidation have been performed for improving the efficiency of degassing of iron melt with applying the vacuum suction degassing method. This degassing method is based on using a porous refractory material, which separates the melt from the outer space under a vacuum condition. The degassing reaction takes place at the melt-porous material interface and the gascous products are easily removed from the interface by permeating the porous material. The necessary condition is that the melt should not permeate the material. Since the area of the melt-porous material interface can be arbitrarily increased, it is possible to increase the degassing rate optionally.As for decarburization of iron melt, with using solid oxide, an attempt was made to obtain a high decarburization rate by immersing an Al_2O_3-2-30%Fe_2O_3 porous tube in the melt. The decarburization proceeded by the reaction between C and Fe_2O_3 (amd/or O). The decarb … More urization increased with increasing Fe_2O_3 content of the tube, but the oxygen content of the melt also increased. In addition, since the hot strength of the tube of high Fe_2O_3 content was not sufficient, deformation of the tube took place during the experiment at lower internal pressure of the tube, and the gas permeability of the tube decreased. In this case, the decarburization rate also decreased. Hence, the Al_2O_3-Fe_2O_3 tube was not superior in the decarburization rate to the Al_2O_3-SiO_2 tube used in our previous experiments.Experiments on dehydrogenization of iron melt were made with blowing Ar gas onto the melt surface and with or without immersing an Al_2O_3 prorous tube. It is shown that the dehydrogenization rate is controlled by gas-and liquid-phase mass transfers. The mass transfer coefficients for the tube-melt interface and obtained by applying a mixed control model. The gas-phase mass transfer coefficients is larger for the tube of higher gas permeability.Dcoxidation experiments of iron melt were made with immersing MgO-10-30%C porous tube. Oxygen in the melt reacted with C of the tube to form CO and/or with Mg vapor produced by the MgO-C reaction to form MgO,and the dcoxidation proceeded effectively. Dcoxidation experiments were also made with immersing a MgO prorous tube filled with MgO-C powder. In this case, oxygen in the melt could react only with Mg vapor, and contribution of the Mg vapor to the dcoxidation is made clear. Less

已经进行了有关脱氧，脱氢和二氧化剂的实验研究，以通过应用真空任务脱气法提高铁熔体脱气的效率。这种脱气方法基于使用多孔难治材料，该材料在真空条件下将熔体与外太空分开。脱气反应发生在熔体材料界面上，并通过渗透到多孔材料来轻松从界面中除去气味产物。必要的条件是熔体不应渗透材料。由于可以任意增加熔体材料界面的面积，因此可以选择提高脱气速率。用使用固体氧化物进行铁熔体的脱氧化速率，尝试通过浸入AL_2O_2O_3-2-30％FE_2O_2O_2O_3 POOL TUBE中的AL_2O_2O_3-2-30％FE_2O_3 PORTUBE进行高脱氧化率。脱氧是由C和Fe_2O_3（AMD/或O）之间的反应进行的。脱砂…随着Fe_2O_3的增加而增加，但熔体的氧含量也增加了。此外，由于高Fe_2O_3含量的管的热强度不够，因此在试管较低的内部压力下进行了试管的变形，并且管的气体渗透性降低。在这种情况下，脱氧率也下降。因此，AL_2O_3-FE_2O_3管的脱螺旋速率并不优于我们以前实验中使用的Al_2O_3-SIO_2管。对铁熔体脱氢熔融的脱氢作用是用吹出AR气体在熔体表面上且无需浸入Al_2O_2O_3 PrOUF FOROUF FOROUF FOROUF FOROUF FORFOUF FORFOREFOUS。结果表明，脱氢速率由气体和液相转移控制。管熔体界面的传质系数，并通过应用混合控制模型获得。对于较高的气体渗透性管，气相传质系数较大。用浸入MGO-10-30％C多孔管进行铁熔体的二氧化实验。熔体中与管子C的氧气形成CO和/或由MGO-C反应产生的MGO形成MGO的MG蒸气，并有效地进行了二氧化剂。DCOXIDATION实验还通过浸入填充MGO-C-C粉末的MGO PROOL TUBE进行。在这种情况下，熔体中的氧气只能与MG蒸气反应，并且MG蒸气对二氧化的贡献清晰。较少的