Preparation of High Purity Vanadium Metal for Hydrogen Storage Using the Direct Reduction and Simultaneous Molten Salt Electrolysis

直接还原同步熔盐电解制备储氢用高纯钒金属

• 批准号: 18360367
• 负责人: SUZUKI Ryosuke
• 金额: $ 7.92万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360367/
• 关键词: Vanadium; Oxide; Direct Reduction; Electrolysis; Calcium Chloride; Oxygen Concentration; OS法

A New process was developed that the metallic vanadium (V) was prepared by the direct reduction from the molten vanadium oxide melt (V_2O_5). Two steps (A) and (B) were combined: (A) The solid oxides was directly reduced by calcium dissolved in the molten salt, and (B) the by-product CaO was electrochemically decomposed into the metallic calcium. This combination is hereafter called as OS process, which is extended to the molten oxide V_2O_5, in addition to the solid lower oxides.By applying OS process in the molten CaCl_2, the optimization of electrodes arrangement was studied in order to react efficiently with the molten oxide V_2O_5 and Ca existing near the cathode. Mo or V was taken for the cathodic material. The current efficiency decreased when the crucible-type electrode was used. The anodic carbon was set more closely to the cathode, such as in a few mm, and we obtained the excellent quality of vanadium metal containing only 2000 ppm oxygen. The phase transformation during the reduction was studied in addition to the analysis of electrochemical behavior and current efficiency at the various electrode arrangements. The reduction rate corresponded well to the supplied current. A high current efficiency could be achieved at the initial stage of reaction. At the later stage of reduction, however, the deoxidation from the obtained vanadium metal was dominant, and both the current and the current efficiency decreased. The decreasing rate of oxygen content could be expressed in an unique formula against the supplied electric charge over the whole experimental time. This implies that the rate-determining step in OS process is the diffusion of Ca or CaO into the molten CaCl_2 bulk.

开发了一个新的过程，即通过从氧化钒熔体的直接减少（V_2O_5）来制备金属钒（V）。组合了两个步骤（a）和（b）：（a）溶解在熔融盐中的钙直接降低固体氧化物，（b）（b）将副产物CAO电化学分解为金属钙。此组合被称为OS工艺，除了固体下部氧化物外，还将其扩展到熔融氧化物V_2O_5。通过在熔融CACL_2中应用OS过程，研究了电极布置的优化，以便与熔融有效地反应。氧化物V_2O_5和CA在阴极附近存在。 MO或V用于阴极材料。当使用坩埚型电极时，电流效率降低。阳极碳的设置与阴极更接近，例如几毫米，我们获得了仅包含2000 ppm氧的钒金属的优质质量。除了分析各种电极布置下的电化学行为和电流效率外，还研究了还原过程中的相变。降低率与所提供的电流很好。在反应的初始阶段，可以实现高电流效率。然而，在还原的后期，所获得的钒金属的脱氧化是主要的，电流和电流效率都降低。在整个实验时间内，氧含量的降低速率可以用独特的公式与所提供的电荷表示。这意味着OS过程中的速率确定步骤是CA或CAO扩散到Molten CACL_2块中。

项目成果

溶融塩化カルシウム中でのカルシウム還元

熔融氯化钙中的钙还原

• 发表时间: 2006
• 期刊: 溶融塩および高温化学 No.1(印刷中)
• 作者: Kuwamura;H.;Tanaka;N.;Sugimoto;H.;Kohno;A;鈴木亮輔
• 通讯作者: 鈴木亮輔

Reduction of V_20_5 by the Molten Salt Electrolysis of (CaCl_2+CaO)

(CaCl_2 CaO)熔盐电解还原V_20_5

• 发表时间: 2007
• 作者: H. Sakai;Y. Oka and R.O. Suzuki;岡佑一;岡佑一;Y. Oka and R.O.Suzuki
• 通讯作者: Y. Oka and R.O.Suzuki

Preparation of Hydrogen Storage Ti-V-Cr Alloy from the Oxide Mixture in CaCl_2Molten CaCl_2

CaCl_2熔融CaCl_2氧化物混合物制备储氢Ti-V-Cr合金

• 发表时间: 2007
• 作者: 岡佑一;鈴木亮輔;R. O. Suzuki;R. O. Suzuki;R.O.Suzuki
• 通讯作者: R.O.Suzuki

溶融塩化カルシウム浴を用いた酸化バナジウムの直接還元

使用熔融氯化钙浴直接还原氧化钒

• 发表时间: 2008
• 期刊: 日本金属学会誌
• 作者: 岡佑一;鈴木亮輔
• 通讯作者: 鈴木亮輔

金属バナジウムの製造

金属钒的制造

• 发表时间: 2006
• 作者: R.O. Suzuki;K. Kanoh and Y. Matsuoka;鈴木亮輔
• 通讯作者: 鈴木亮輔