Sustainable recycling of titanium from TiO_(2) in spent SCR denitration catalyst via molten salt electrolysis  

作　　者：Xuyang Bai Xiaojia Shang Heli Wan Yusi Che Bin Yang Jilin He Jianxun Song 

机构地区：[1]Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,450001 Zhengzhou,Henan,China [2]National Engineering Laboratory of Vacuum Metallurgy,Kunming University of Science and Technology,650093 Kunming,Yunnan,China [3]State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,650093 Kunming,Yunnan,China

出　　处：《Journal of Energy Chemistry》2021年第7期557-563,共7页能源化学（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.51804277);supported by the State Key Laboratory of Special Rare Metal Materials(No.SKL2020K004);Northwest Rare Metal Materials Research Institute;supported by the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization(No.CNMRCUKF2008)。

摘　　要：Spent catalyst used for denitration by selective catalytic reduction(spent SCR denitration catalysts) is one of the important urban mines due to the high content of TiO_(2)(~85 wt%) and the massive accumulation amount(over 100,000 tons),therefore,value-added reutilization of titanium in spent SCR catalysts is considerably meaningful.In this paper,a novel method is proposed for converting the titanium oxide in spent SCR denitration catalysts to metallic titanium.Specifically,titanium dioxide(TiO_(2)) was firstly obtained from spent SCR denitration catalysts after removing the impurities by hydrometallurgy process.Then,TiO_(2) is converted to Ti_(2)CO by carbothermic reduction method,and Ti_(2)CO was further purified by oleic acid capture.Finally,by utilizing the as-prepared Ti_(2)CO as the consumable anode in the NaCl-KCl molten salt,high-purity metallic titanium was deposited at cathode,all confirming the feasibility for the conversion of low-grade TiO_(2) in the spent catalysts,from 60 wt% to high-purity metallic Ti(99.5 wt%), furthermore,the energy consumption of this process is 3950 kWh tonne-1 Ti,which is lower than that of most traditional titanium metallurgy methods.The method herein can provide new insights for the value-added recycling of titanium resources in urban mines.

关 键 词：Spent SCR denitration catalyst HYDROMETALLURGY IMPURITY Ti_(2)CO Molten salt 

分 类 号：TQ426[化学工程] X773[环境科学与工程—环境工程]