Abstract
This paper proposes an innovative approach for co-processing zinc-bearing dust with biological sludge, using the organic matter in the sludge as a reducing agent to replace traditional fossil fuels (coal/coke). The results show that the reduction process of biological sludge-zinc-bearing dust pellets (BZP) is divided into two stages. In the first stage (25–620 °C), the breakdown of C = C, C-O-C, and C-O bonds present in biological sludge produced carbon oxide (CO) and hydrogen (H2), facilitating the conversion of zinc ferrite (ZnFe2O4) to magnetite (Fe3O4). The second stage (620–1300 ℃), the cleavage of C = C, C–C and C–H bonds and carbon gasification generate more CO and H2, further reducing magnetite (Fe3O4) to metallic iron (Fe) and zinc oxide (ZnO) to zinc monomers (Zn). The activation energy of BZP in the two stages was 32.86 kJ·mol−1 and 73.88 kJ·mol−1, respectively. The metallization rate and the zinc removal rate of BZP achieved 58.47 % and 86.74 %, respectively, indicating the effectiveness and feasibility of the propose of approach. This approach provides a clean and comprehensive utilization way out for zinc-bearing dust and biological sludge.
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