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Keysino's acid-tolerant purification system enables direct recovery of 98.5%-purity sulfuric acid and copper sulfate from stripping bath effluents (containing CuSO₄, H₂SO₄, Zn/Fe/Pb/Co/Ni impurities, and Ag/Au/Pt-rich anode slime) without neutralization, reducing sludge by 80% and operational costs by 40%. The purified CuSO₄ solution is processed into industrial-grade copper hydroxide sludge and nickel sulfate hexahydrate crystals (<50 ppm impurities), while ion-exchange extraction recovers >99.9%-pure precious metals from slime. This closed-loop system achieves 99% process liquid reuse and 70% fresh acid reduction, establishing a cost-effective model for strategic metal recovery and acid regeneration in electroplating industries.