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This research aims to evaluate hydrazine as a selective reductant for zinc cake processing and optimize recovery parameters.

Hydrazine-Assisted Reductive Leaching of Zinc Cake: Thermodynamic Assessment, RSM Optimization, and Microstructural Evolution of Refractory Residues

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Randomized trial explores hydrazine use for zinc recovery in hydrometallurgical wastes, suggesting an effective recycling method.

This research aims to evaluate hydrazine as a selective reductant for zinc cake processing and optimize recovery parameters.
Systematic thermodynamic assessments were conducted at 25–120 °C to analyze hydrazine's effectiveness.
Four leaching variables were evaluated using central composite design (CCD) and response surface methodology (RSM).
Post-leaching analysis included X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) to examine solid residues.
Under optimized conditions, zinc extraction efficiencies of 91.7%, 98.1% for copper, and 91.2% for cadmium were achieved.
Solid residue mass was reduced by 55–60%, indicating significant material recovery efficiency.
Thermodynamic calculations confirmed effective Fe(III) to Fe(II) conversion, disrupting zinc ferrite stability.

Rakhmataliev et al. (2026) studied this question.

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