Valency Study of Vanadium in Stone Coal Ash of Jiangxi Province

作     者：Xu Guozhen Ge Naie Li JiguiDepartment of Basic Courses, China University of Geosciences, Beijing 100083 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：1990年第9卷第1期

页      面：126-134页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This project is supported by the National Natural Science Foundation of China 

主　　题：coal ash NaCl / oxidation roasting leaching and extraction the soluble vanadate recovery Jiangxi Province. 

摘      要：Vanadium-bearing stone coal is a new vanadium resource; recovery of V2O5 from the coal has been investigated. It has been found that a satisfactory extraction of V2O5 depends on both the oxidation of V and its reaction with sodium salt. V in the coal ash of Yushan mainly exists in two oxidation states; 98% V (Ⅲ) and 2% V(Ⅳ). The distribution of valency of V shows that organic matter determines V valency at low temperatures, at about 470℃ , V(Ⅲ) is completely oxidized to V (Ⅳ); above 500 ℃, the temperature is the most important factor for the oxidation of V At higher temperatures no more V is oxidized to V(Ⅴ); an equilibrium is established after 92% of V is oxidized to V(Ⅴ). The roles of NaCl in the recovery of V2O5 from the coal ash were discussed. The best conditions for roasting are temperature 750-800℃ for 1 h. under the oxidation-chlorination atmosphere. When the ore : NaCl = 100 :10 by weight, ηroast reaches 85.5%. According to the results, a flowsheet for V2O5 extraction from coal ash has been proposed.