著者

南條 道夫 金井 俊治 伊藤 良雅 谷内 研太郎

出版者

一般社団法人 軽金属学会

雑誌

軽金属 (ISSN:04515994)

巻号頁・発行日

vol.34, no.7, pp.382-388, 1984-07-30 (Released:2008-07-23)

参考文献数

25

---

Bauxite was chlorinated in molten salts using chlorine gas and carbon to produce Alcoa Electrolyte such as AlCl3-NaCl-KCl melt. Chlorine gas was mildly introduced at 820°C into the suspension of bauxite and carbon powder in NaCl-KCl eutectics. AlCl3-FeCl3-NaCl-KCl melts are obtained without significant loss of AlCl3, carbon and chlorine gas. Hematite in bauxite dissolves in molten NaCl-KCl salt. Chlorination of alumina is enhanced by ferric chloride. Selective chlorination of bauxite is performed with hydrogen chloride gas and carbon in NaCl-KCl salt bath to give FeCl2 not FeCl3. The selective chlorination to remove hematite as FeCl3 is also achieved when a large amount of bauxite is introduced in a small amount of molten salt.

著者

伊藤 富士隆 菅原 尚生 五十嵐 章 町澤 忠一 神足 俊彦 富樫 三男 佐藤 修彰 南條 道夫

出版者

東北大学

雑誌

東北大学素材工学研究所彙報 (ISSN:09194827)

巻号頁・発行日

vol.50, no.1, pp.27-37, 1994-12

---

Niobium penta-butoxide (Nb(OBu^n)_5) was synthesized from NbCl_5 in a plant scaleoperation. The content of Ta (OBu^n)_5 in Nb (OBu^n)_5 was decreased by the distillation of Nb (OBu^n)_5 using thin film down flow type molecular distillator. But the distillation method was not effective for obtaining the 4N purity Nb (OBu^n)_5 because the Nb (OBu^n)_5 was thermally unstable. Ultra fine Nb_2O_5 powder was produced by the hydrolysis of Nb (OBu^n)_5. Some physical properties of the Nb_2O_5 fine particle, such as specific surface area, mean particle size, apparant density condensation, were measured. The purity of the obtained Nb (OBu^n)_5 and the yield of niobium in the plant operation were 99.996% and 82.3%, respectively.niobiumtitaniumscrapchlorinationalkoxidationultra fine powderrecylingplant operation