Recovery of cobalt as mesoporous Co3O4 from ammonia leaching solution of spent lithium battery cathode material via reductive ammonia distillation and thermal decomposition

无机化学 化学 热分解 浸出(土壤学) 阴极 蒸馏 介孔材料 分解 电池(电) 材料科学 催化作用 有机化学 土壤水分 土壤科学 环境科学 量子力学 物理化学 物理 功率(物理)
作者
Jiancheng Yu,Baozhong Ma,Chengyan Wang,Yongqiang Chen
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:306: 122614-122614 被引量:4
标识
DOI:10.1016/j.seppur.2022.122614
摘要

• A sustainable process for recovering Co 3+ from NH 3 –(NH 4 ) 2 CO 3 solution was studied. • More than 99% 97% of cobalt could be precipitated by reductive ammonia distillation. • The mesoporous Co 3 O 4 product was obtained at 300 °C for 3 h. • The phase transform during the thermal decomposition process was revealed. • The average particle size of Co 3 O 4 increased with rising roasting temperature. Ammoniacal leaching system is widely applied to cobalt extraction due to its selectivity and mild leaching conditions. However, in ammonia leach liquor, the complexation of Co 3+ and ammonia is stable ( K [Co(NH 3 ) 6 3+ ]=4.5×10 33 ), which brings difficulties to cobalt recovery. In this work, a clean and sustainable process for recovering Co 3+ as mesoporous Co 3 O 4 product was proposed from NH 3 –(NH 4 ) 2 CO 3 system, which included reductive ammonia distillation and thermal decomposition. Firstly, through ammonia distillation with simultaneous addition of hydrazine hydrate as a reducing agent, more than 97% of cobalt can be precipitated in the form of (NH 4 ) 1.89 Co 7.88 (CO 3 ) 6 (OH) 6 (H 2 O) 4.27 under the optimal conditions. Mechanism analysis shows that the addition of hydrazine hydrate can reduce part of Co 3+ to Co 2+ , which is beneficial to the precipitation of cobalt. Subsequently, the Co 3 O 4 products were prepared at 300 °C for 3 h via thermal decomposition of the precipitation. Meanwhile, the phase transformation and morphology changes of the product were investigated in-depth via relevant characterization methods. This process not only achieves efficient recovery of cobalt from the ammoniacal solutions but also the evaporated ammonia and residual solution can be returned to ammonia leaching.
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