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Sustainable recycling of titanium from TiO2 in spent SCR denitration catalyst via molten salt electrolysis
Journal of Energy Chemistry ( IF 14.0 ) Pub Date : 2020-11-06 , DOI: 10.1016/j.jechem.2020.11.002
Xuyang Bai , Xiaojia Shang , Heli Wan , Yusi Che , Bin Yang , Jilin He , Jianxun Song

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 TiO2 (∼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 (TiO2) was firstly obtained from spent SCR denitration catalysts after removing the impurities by hydrometallurgy process. Then, TiO2 is converted to Ti2CO by carbothermic reduction method, and Ti2CO was further purified by oleic acid capture. Finally, by utilizing the as-prepared Ti2CO 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 TiO2 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.



中文翻译:

通过熔融盐电解可持续地将废SCR脱硝催化剂中的TiO 2中的钛可持续回收

通过选择性催化还原脱硝的废催化剂(废SCR脱硝催化剂)由于TiO 2含量高(约85 wt%)和大量堆积(超过100,000吨)而成为城市的重要矿山之一。因此,废SCR催化剂中钛的增值再利用意义重大。本文提出了一种将废SCR脱硝催化剂中的氧化钛转化为金属钛的新方法。具体地,在通过湿法冶金法去除杂质之后,首先从废SCR脱硝催化剂中获得二氧化钛(TiO 2)。然后,通过碳热还原法将TiO 2转化为Ti 2 CO,并将Ti 2通过油酸捕获进一步纯化CO。最后,通过将制得的Ti 2 CO用作NaCl-KCl熔融盐中的消耗阳极,高纯度金属钛沉积在阴极上,所有这些都证实了在废催化剂中转化低级TiO 2的可行性。从60 wt%到高纯度金属Ti(99.5 wt%),此外,此过程的能耗为3950 kWh吨-1 Ti,低于大多数传统的钛冶金方法。本文的方法可以为城市矿山中钛资源的增值回收提供新的见解。

更新日期:2020-11-06
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