Reaction kinetics of lithium extraction and a recycling process for lithium meta-titanate pebbles
Reaction kinetics of lithium extraction and a recycling process for lithium meta-titanate pebbles
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DOI：
10.1080/00223131.2022.2113163
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发表时间：
2022-08
影响因子：
1.2
通讯作者：
Jae-Hwan Kim;Yoshiaki Akatsu;T. Hwang;Yutaka Sugimoto;Suguru Nakano;M. Nakamichi
中科院分区：
文献类型：
--
作者：
Jae-Hwan Kim;Yoshiaki Akatsu;T. Hwang;Yutaka Sugimoto;Suguru Nakano;M. Nakamichi
摘要日本核聚变堆水冷固体增殖包层需要大量的偏钛酸锂（Li 2 TiO 3）小球作为氚增殖材料。发展氚增殖材料的再循环过程对于早日实现聚变反应堆至关重要。本研究旨在了解通过诱导化学反应和应用微波加热从Li 2 TiO 3中提取Li的动力学，并建立一种高效的废Li 2 TiO 3卵石回收工艺。在各种条件下进行的Li提取实验的结果表明，该提取反应可以通过kct = 1-（1-f）1/3的表面化学反应来应用。萃取反应的表观活化能为52.78 kJ/mol，与化学反应控制机理一致。此外，Li 2 TiO 3在HCl溶液中的溶解反应级数为一级。提出了一种高效回收Li 2 TiO 3小球的工艺。图形摘要
ABSTRACT Fusion reactors require large amounts of lithium meta-titanate (Li2TiO3) pebbles as tritium breeding materials for Japanese water-cooled solid breeder blanket. The development of a recycling process for tritium-breeding materials is essential for the early realization of fusion reactors. This study was proposed to understand the kinetics of Li extraction from Li2TiO3 by inducing chemical reactions and applying microwave heating and establish a highly efficient recycling process for spent Li2TiO3 pebbles. The results of Li extraction experiments performed under various conditions clarified that this extraction reaction could be applied via a surface chemical reaction with kct = 1 − (1 − f)1/3. The apparent activation energy associated with this extraction reaction was evaluated to be 52.78 kJ/mol, which is in agreement with that of the chemical reaction-controlled mechanism. Additionally, the reaction order for the dissolution of Li2TiO3 in the HCl solution was first-order. The highly efficient recycling process of Li2TiO3 pebbles was suggested. Graphical Abstract