新脱ガス法(真空吸引脱ガス法)による融体の高純度化に関する研究

新型脱气方法（真空抽吸脱气法）熔体高纯度研究

• 批准号: 04555158
• 负责人: SANO Masamichi
• 金额: $ 11.58万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555158/
• 关键词: MOLTEN METAL; HIGH PURITY METAL; VACUUM DEGASSING; DEHYDROGENATION; DENITROGENATION; DEOXIDATION; DECARBURIZATION; POROUS MATERIAL; 融体; 脱ガス

A vacuum suction degassing method (VSD method) has been proposed and applied to remove gas-forming impurities in molten metal. The melt is separated from the outside by means of a porous partition wall permeable to gas and impermeable to the melt, and outside is kept at a reduced pressure. Then, the gas-forming impurities gasify at the partition wall-melt interface and the formed gas is sucked through the wall to the outside. Thus, the removal of the impurities from the molten metal is enhanced.Experiments of decarburization, denitrogenation of molten iron have been performed in the ranges of low concentrations by immersing a porous refractory tube into the melt. The decarburization proceeds by a reaction between the carbon in the melt and the refractory oxide, such as Al_2O_3, SiO_2, etc. The carbon concentration of the melt decreases down to a very low value of a few ppm, while the oxygen concentration is kept below 50ppm. The rate of decarburization with an Al_2O_3-SiO_2 tube is muc … More h higher than that with an Al_2O_3 tube. In crease in gas permeability of the porous tube makes the decarburization rate larger. It is shown that the vacuum suction degassing method can greatly increase the decarburization rate of molten iron. The VSD method has been applied to denitrogenate molten iron. The rate of denitrogenation increases by the simultaneous decarburization. The chemical reaction rate constant for the denitrogenation at the porous tube-molten iron interface is almost equal to that obtained previously by gas blowing onto the melt surface.The deoxidation of molten copper with graphite has been studied by applying the VSD method. The deoxidation rate decreases due to suction of CO gas and hence lack of stirring by the CO bubbles. However, the minimum oxygen concentration decreases to a lower value than that obtained without using the VSD method.The VSD method is also shown to be effective in dehydrogenating molten iron and molten aluminum. It is found that the dehydrogenation of molten iron is controlled by the liquid phase and the gas phase mass transfer and that of molten aluminum by the liquid phase mass transfer.A test of practical application could not have been carried out and is the subject of a future study. Less

提出了一种真空抽吸除气法（VSD法），并将其应用于去除金属液中的造气杂质。熔体通过可渗透气体而不可渗透熔体的多孔隔壁与外部隔离，并且外部保持在减压下。然后，形成气体的杂质在分隔壁-熔体界面处气化，并且形成的气体通过壁被抽吸到外部。在低浓度范围内，用多孔耐火材料管浸入铁水中进行了铁水脱碳、脱氮试验。脱碳是通过熔体中的碳与Al_2O_3、SiO_2等难熔氧化物反应进行的，熔体中的碳浓度降至几ppm，而氧浓度保持在50 ppm以下。用Al_2O_3-SiO_2管脱碳，脱碳速度快，脱碳率高，且有良好的经济效益。 ...更多信息 h高于Al_2O_3管。多孔管透气性的增加使脱碳速率增大。结果表明，真空抽吸脱气法可大幅度提高铁液的脱碳率。采用VSD法对铁水进行脱氮处理。脱氮速率因同时脱碳而增加。多孔管-铁液界面脱氮的化学反应速率常数与以前用吹气法测得的速率常数几乎相等。脱氧速率由于CO气体的吸入而降低，因此缺乏CO气泡的搅拌。但是，最低氧浓度降低到低于不使用VSD方法所获得的值。VSD方法也被证明是有效的，在净化铁水和铝液。结果表明，铁液的脱氢受液相和气相传质控制，铝液的脱氢受液相传质控制，目前尚不能进行实际应用试验，有待进一步研究。少

项目成果

佐野 正道,他: "真空吸引脱ガス法による溶鉄の脱ガス速度に対する多孔質浸漬管のガス透過性の影響" 材料とプロセス. 6. 191 (1993)

Masamichi Sano 等人：“多孔浸没管的透气性对真空抽吸脱气法铁水脱气速率的影响”材料与工艺 6. 191 (1993)。

Masamichi Sano et al.: "Removal of Hydrogen from Molten Iron by Ar Gas Blowing" CAMP. vol.7-No.1. 269 (1994)

Masamichi Sano 等人：“通过吹氩气从铁水中去除氢气”CAMP。

佐野正道ら: "アルゴン吹付けによる溶鉄の脱水素速度" 材料とプロセス. 7(発表予定). (1994)

Masamichi Sano 等人：“氩气喷射对铁水的脱氢率”材料和工艺 7（待提交）。

M.Sano et al.: "Vacuum Suction Degassing-Application to Degassing of Molten Metals" Aluminum Cast House Technology,ed.by M.Nilmani,TMS. 125-136 (1993)

M.Sano 等人：“真空抽吸脱气 - 在熔融金属脱气中的应用”铝铸造厂技术，M.Nilmani 编，TMS。

佐野正道ら: "真空吸引脱ガス法による溶鉄の脱水素速度" 鉄と鋼. 80(発表予定). (1994)

Masamichi Sano 等人：“真空抽吸脱气法的铁水脱氢率”Tetsu-to-Hagane 80（待提交）。