Production of niobium powder by electronically mediated reaction (EMR) using calcium as a reductant

被引：67

作者：

Okabe, TH ^{[1
]}

Park, I ^{[1
]}

Jacob, KT ^{[1
]}

Waseda, Y ^{[1
]}

机构：

[1] Tohoku Univ, Inst Adv Mat Proc, Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 288卷 / 1-2期

关键词：

niobium; metallothermic reduction; thermodynamics; electrochemistry; reduction process;

D O I：

10.1016/S0925-8388(99)00130-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Explored in this study is an electronically mediated reaction (EMR) route for the production of niobium powder using calcium as a reductant for niobium oxide (Nb2O5). Feed material, Nb2O5, and reductant calcium alloy containing aluminum and nickel were charged into electronically isolated locations in a molten salt (e.g. CaCl2) at 1173 K. The current flow through an external path between the feed and reductant locations was monitored. A current approximately 0.4 A was measured during the reaction in the external circuit connecting cathode and anode location. Niobium powder with low aluminum and nickel content was obtained although liquid Ca-Al-Ni alloy was used as the reductant. This clearly demonstrates that niobium metal powder can be produced by an electronically mediated reaction (EMR), without direct physical contact between feed (Nb2O5) and reductant (calcium). Mechanism of calciothermic reduction of Nb2O5 in the molten salt is discussed using an isothermal chemical potential diagram. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：200 / 210

页数：11

共 19 条

[1]

Barin I.P.D., 1989, Thermochemical Data of Pure Substances

[2]

DNEPROVA VG, 1968, DOKL AKAD NAUK SSSR+, V178, P135

[3]

Eastman E.D., 1950, CHEM METALLURGY MISC, P10

[4]

Gupta C.K., 1984, INT MET REV, V29, P405

[5]

GUPTA CK, 1964, T METALL SOC AIME, V230, P1433

[6] BOMB REDUCTION OF TANTALUM PENTOXIDE BY CALCIUM METAL [J].

GUPTA, CK ;

JENA, PK .

JOURNAL OF THE LESS-COMMON METALS, 1965, 8 (02) :90-&

[7]

Kroll W.J., 1940, T ELECTROCHEM SOC, V78, P35, DOI DOI 10.1149/1.3071290

[8]

Massalski T.B., 1996, Binary Alloy Phase Diagrams, V2nd

[9]

Okabe T.H., 1998, SHIGEN TO SOZAI, V114, P573

[10] Phase equilibria and reaction pathways during TiCl4 reduction by magnesium and sodium involving electronically mediated reaction [J].

Okabe, TH ;

Uda, T ;

Kasai, E ;

Waseda, Y .

JOURNAL OF THE JAPAN INSTITUTE OF METALS, 1997, 61 (07) :610-618

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