三氯化铬溶液中铁的分离研究

doi:10.19964/j.issn.1006-4990.2022-0614

Abstract

Abstract:

Iron-chromium redox flow batteries have long cycle life，high stability and low cost，and are increasingly used in the field of large-scale electrical energy storage.The research was carried out on the recovery and utilization of failure electrolyte of iron-chromium flow battery.Fe was separated from a mixed solution of CrCl₃ and FeCl₃，and Cr and Fe were both recovered.The removal of iron ions from chromium trivalent system by oxalic acid precipitation method was studied，and the effects of oxalic acid addition amount，solution pH，reaction temperature and stirring rate on the removal rate of iron were investigated.The results showed that when the oxalic acid dosage was 1.2 times of the theoretical value，the solution pH was 3.0 and the reaction temperature was 25 ℃，the iron removal rate could reach more than 97%.The obtained solid phase was ferrous oxalate dihydrate with good crystal morphology and purity greater over 98%.The research could provide an effective way for the comprehensive utilization of the electrolyte of iron-chromium redox flow batteries.

Key words: chromium trichloride, ferric trichloride, oxalic acid, ferrous oxalate dehydrate

CLC Number:

TQ443.1

LI Shuqi, LI Xinqian, FENG Haitao, LI Bo, NIU Zhengrong, DONG Yaping. Study on separation of iron from chromium trichloride solution[J]. Inorganic Chemicals Industry, 2023, 55(8): 91-94.

Figures/Tables 10

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Study on separation of iron from chromium trichloride solution

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