<報文>都市廃棄物の処理と資源化に関する基礎的研究(VII) : Nb・Ti, Nb_3Sn超電導線材スクラップからのNbリサイクリング工程における脱銅過程

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Throughout human history, we have faced the problems of scarcity. It is well known that many of key raw materials needed for high technology today fall into this category sufficiently. Supply of these metals is one of the essential condition to dovelop new devices such as superconductors. The development of recycling technology offers a possible solution to this problem. In this report, we discuss the recycling of niobium metal from superconductor scraps such as Nb・Ti alloy and Nb_3Sn compound wires. The establishment of recycling processes to recover niobium metal and other valuables is found to depend on the abundance of each elements and the structure of the scraps. The EPMA technique has been adopted to characterize the scraps and the results obtained are given below. 1) Ni・Ti alloy superconductor wires are first electrolytically treated to remove clad copper since other methods to remove copper such as pyrometallurgical means are not useful. 2) Clad, interstitial and center copper is stepweisely dissolved and its dissolution behavior is observed by EPMA. 3) Nb_3Sn compound wire is characterized by EPMA and the distribution of Nb, Sn and Cu is determined. 4) The electrolysis of Nb_3Sn compound wire results in tth dissolution of bronze but not Sn from Nb_3Sn. The EPMA method is essential for the characterization of scraps such as Nb-Ti and Nb_3Sn alloys with complicated structures and compositions.niobiumNb・TiNb_3Snsuperconductor wirerecyclingelectrolysisEPMA
東北大学の論文
1988-03-25

<報文>都市廃棄物の処理と資源化に関する基礎的研究(VII) : Nb・Ti, Nb_3Sn超電導線材スクラップからのNbリサイクリング工程における脱銅過程

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