Purification of Refractory Metals

Suri, A.K.; Gupta, Chandni; Tekin, Ahmet

doi:10.1080/08827509808962493

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The data for hydrogen solubility in pure vanadium and V-O solid solution followed the Sieverts' law, as shown in Equation (1). The temperature dependence of the Sieverts constant KH is represented by H ln B KA T  (14) where T(K) is the temperature, and A and B are constants. The values of A and B with various oxygen contents at 600-800 °C were measured by Yamanaka et al [26][27], and the relationship of ln pH2 (atm) with x (H/V atomic ratio) and T is listed in the following equations:…”

Section: V-h Binary System (δG1) and V-h-o Ternary System (δG4)mentioning

confidence: 99%

“…As a valuable metal, vanadium and its compounds are widely used in the steel, chemical, vanadium battery, aerospace, and nuclear power industries because of their excellent material performance [5][6][7][8][9]. At present, metal vanadium or V-bearing alloy was prepared using aluminum with an aluminothermic reduction process at high temperature due to its high melting point, which necessitates a significant amount of energy for the heating and holding process [1,[10][11][12][13][14]. Moreover, the addition of CaO flux not only removes a lot of heat, but also leads to a large amount of vanadium loss [15].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic behavior of dissolved oxygen and hydrogen in pure vanadium

Zhong

Pei

Xiang

et al. 2021

J min metall B Metall

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The mechanism governing the deoxidation of vanadium metal is regarded as fundamental knowledge; however, it has not been elucidated in existing literature. In this paper, the thermodynamic data of V-H-O systems were summarized, and the Gibbs free energies of the main compounds were calculated. Consequently, the deoxidation limits of different reductants in a V-O system were evaluated, namely: Si, Al, and Mg. It was observed that Si cannot remove an O content of less than 7.27 wt% from V. However, Al was the stronger reducing agent; it could remove O contents of up to 0.01 and 0.1 wt% at 800 and 1050 ?C, respectively. Nevertheless, Mg exhibited the best reducing properties as it could remove less than 0.01 wt% of O at 1100 ?C. The addition of H2 renders the V-O solid solution unstable to a certain extent, thereby indicating that H2 facilitates deoxygenation. Furthermore, the results obtained by analyzing the equilibrium conditions were in accordance with the results of the deoxidation limit in the V-O system. In other words, this study demonstrates that the oxygen in vanadium can be effectively controlled by changing the reductant dosage and temperature.

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Section: V-h Binary System (δG1) and V-h-o Ternary System (δG4)mentioning

confidence: 99%