Study on the Kinetics of Zinc Leaching Residue Smelting Reduction

This study investigates the desulfurization and smelting reduction processes of zinc leaching residue and analyzes the kinetics of the desulfurization and smelting reduction processes of zinc leaching residue. The results showed that, when the desulfurization temperature was 1623 K and the desulfurization time was 27 min, the desulfurization rate of zinc leaching residue was over 95%. When the melting reduction temperature is 1773 K and the melting reduction time is 40 min, the zinc reduction rate is over 98%, and when the melting reduction time is 100 min, the iron reduction rate is over 98%. The desulfurization process of zinc leaching residue is jointly controlled by mass transfer diffusion and interfacial chemical reactions (1373~1623 K), and the kinetic equation is [1 − (1 − x)1/3]2 = 21,897.11 × exp[−202.881/RT]t. The smelting reduction process of desulfurization slag is jointly controlled by interfacial chemical reactions and mass transfer diffusion (1673~1773 K). The kinetic equation of the zinc smelting reduction process is 1 − 2R/3 − (1 − R)2/3 = 4185.03 × exp[−194.78/RT]t. The kinetic equation of the iron smelting reduction process is 1 − (1 − R)1/3 = 8672.22 × exp[−207.13/RT]t.