Shaoxiang Yang, Jiayu Feng
Zinc-containing solid wastes (ZCSW) from the steel industry pose significant environmental risks due to hazardous heavy metals like zinc, iron, and lead. This study proposes a synergistic ammonia-acid leaching strategy for co-processing blast furnace dust (BFD) and secondary zinc oxide (SZO) to achieve resource recovery and pollution mitigation. The ammonia leaching selectively extracted 70.62–88.08% of Zn while suppressing Fe and Pb dissolution, facilitated by optimized (NH 3·H2O]/[NH4HCO3] ratios (1:1) and pH (9.84). Subsequent acid leaching (3.24 mol ·L-1 HCl, 50 °C) effectively dissolved residual Zn (95.7%) and Pb by leveraging BFD’s reducibility to oxidize refractory ZnS in SZO. Selective metal recovery was achieved through pH-controlled precipitation: Fe³⁺ was removed as Fe2O3 at pH 5, Pb via Zn displacement, and ZnCO3 via ammonium bicarbonate addition. The integration of BFD enhanced ZnS leaching efficiency, while mixed waste ratios (e.g., 3:1 BFD/SZO) optimized elemental separation, converting residues into Fe-enriched (73.42%) materials. This waste-to-waste approach enables simultaneous Zn, Fe, and Pb recovery with <1% residuals, offering a sustainable solution for ZCSW management by bridging resource scarcity and environmental challenges.
@article{0a86e1fa-0b26-4610-b02b-aa1c6b4f9f45,
title={New strategy for recovering Pb, Fe, and Zn from blast furnace dust and zinc oxide via ammonia-acid co-leaching},
author={Shaoxiang Yang and Jiayu Feng},
year={2026},
language={en}
}TY - JOUR TI - New strategy for recovering Pb, Fe, and Zn from blast furnace dust and zinc oxide via ammonia-acid co-leaching AU - Shaoxiang Yang AU - Jiayu Feng PY - 2026 LA - en ER -
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