Sustainable recovery of high-purity nickel from real electroplating sludge <i>via</i> optimized leaching-precipitation process.

ABSTRACT: This study presents an integrated process combining inorganic acid leaching and metal precipitation to recover nickel from real electroplating sludge, offering a sustainable approach suitable for direct application in production facilities in Vietnam. The leaching step was optimized using 5% H₂SO₄ at a solid/liquid (S/L) ratio of 1 : 10, a temperature of 55 °C, and a duration of 40 min, achieving a Ni leaching efficiency of 99.70% while also enabling the effective dissolution of Fe and other coexisting metals, thus demonstrating the high overall leaching efficiency of the process. The resulting leachate was subsequently treated with NaOH to precipitate nickel, with key parameters including pH (2-11), and initial [Ni]₀ concentration (500-4000 mg L^-1

SUBMITTER: Luu TA 

PROVIDER: S-EPMC12697556 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature