<報文>電子ビーム溶解によるジルコニウム合金からの脱すず, 脱鉄

概要

論文の詳細を見る
Removal of tin and iron from the melts of Zr-Sn, Zr-Fe alloys and a zircaloy scrap, which is generated in the fabrication processes of zircaloy tubes for nuclear reactors, has been investigated using a laboratory-scale electron beam furnace working in a vacuum of around 1×(10)^<-3> Pa. Zirconium metal purer than 99.5 mass%Zr (Sn=0.18,Fe=0.011,Ni=0.018,Cr<0.002 mass%) could be obtained by electron beam melting of the zircaloy scrap (Sn=1.42,Fe=0.17,Ni=0.06,Cr=0.10 mass%) for 300 min. It is found that the tin and iron contents in the zirconium alloy melts reduce steadily according to a first order rate law down to about 0.5 mass% and 0.2 mass%, respectively, and further melting causes their removal rates to decrease. The decreases in the removal rates, despite of tin and iron more volatile than zirconium, are considered to be attributed to their low activities in the zirconium alloy melts.electron beam meltingzirconium alloyzircaloyscrapzirconiumrefiningvacuum metallurgyrecovery
1993-03-30