Precipitation of potassium as hazenite from washing water of spent alkaline batteries
Lapinkangas, Suvi; Rautio, Lasse; Kauppinen, Toni; Hu, Tao; Pesonen, Janne; Lassi, Ulla (2022-11-18)
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, 100426. https://doi.org/10.1016/j.ceja.2022.100426
© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2023062863004
Tiivistelmä
Abstract
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.
Kokoelmat
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