Precipitation of potassium as hazenite from washing water of spent alkaline batteries
Lapinkangas, S., Rautio, L., Kauppinen, T., Hu, T., Pesonen, J., & Lassi, U. (2022). Precipitation of potassium as hazenite from washing water of spent alkaline batteries. Chemical Engineering Journal Advances, 12, Article 100426. https://doi.org/10.1016/j.ceja.2022.100426
Published inChemical Engineering Journal Advances
Hu, Tao |
© 2022 The Authors. Published by Elsevier B.V.
Hazenite (KNaMg2(PO4)2 × 14 H2O), a new type of struvite mineral, was precipitated from the potassium-rich washing water of spent alkaline battery black mass. Hazenite can be used as a fertilizer, which would be an additional benefit derived from the sustainable recovery of battery materials. Precipitation experiments were performed using different pH values (9.5–12), Mg:K:PO4 ratios ((1.0–1.5):1:(1.0–1.5)) and temperatures (10–40 °C). Based on the results, hazenite precipitated in a wide pH range under alkaline conditions. The precipitation kinetics were fast, and the purity of the hazenite was high. Overall, hazenite can be precipitated at room temperature without the addition of excess chemicals, which minimizes the consumption of chemicals and energy.
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Additional information about fundingThis research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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