Enhanced Purification of Mixed Hydroxide Precipitate Leachates via P₂₀₄: A Study on Process Efficiency

Abstract:

The purification of mixed hydroxide precipitate leaching solution from impurities was conducted via solvent extraction using the commercial extractant di(2-ethylhexyl) phosphoric acid (P₂₀₄ or D2EHPA). The impurities that were removed are Mn²⁺, Cu²⁺, Ca²⁺, Mg²⁺, and Zn²⁺, while the desired metals remained in aqueous phase which are Co²⁺ and Ni²⁺. Solvent extractions were studied on a batch scale to improve the effect of organic-to-aqueous phase ratio, extractant concentration, saponification rate, and feed solution pH to the removal of impurities. High selectivity of impurities was obtained at a phase ratio organic to aqueous of 1.6:1, extractant concentration of 30 vol%, with saponification rate of 40%, and feed solution pH of 5. The extraction rate achieved for Mn²⁺, Cu²⁺, Ca²⁺, Mg²⁺, and Zn²⁺ are 88.46%, 82.24%, 95.21%, 38.10%, and 99.99% respectively while the co-extracted of Co²⁺ and Ni²⁺ are 17.76%, and 12.52%.

• Periodical: Key Engineering Materials (Volume 1014)
• Pages: 77-84
• DOI: https://doi.org/10.4028/p-X0J0tP
• Online since: June 2025
• Authors: Ramadhani Kemal Fariz*, Yi Hu, Xi Zhi Dong
• Keywords: Mixed Hydroxide Precipitate Leaching Solution, P₂₀₄, Purification, Solvent Extraction

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