Abstract
High-sulphur petroleum coke (HSPC), a significant byproduct of petroleum refining, has limited applications except as fuel for combustion. This study aims to expand its utility by investigating its efficacy as a reductant for disposing of Zn-containing dust, thereby substituting traditional coal-based reductants. The pyrolysis results showed that the gases generated from the pyrolysis of HSPC primarily comprised hydrogen gas (H2), carbon monoxide (CO), methane and carbon dioxide. The reductant gases H2 and CO accounted for above 90% of the total pyrolysis gas at 1200 °C. The reduction reaction mechanism was elucidated by thermodynamic calculations and carbothermal experiments. At 800 °C, ZnFe2O4 is gradually decomposed into Fe3O4, FeO and ZnO, and Fe2O3 is completely reduced to Fe3O4. At 900–1000 °C, iron oxides are basically reduced to Fe, and ZnO is also reduced to Zn. Above 1100 °C, CaMgSiO4 as a slag phase is generated due to the combination of CaO, MgO and SiO2. At 1200 °C, the roasting product with a metallic material is obtained, and the sulphur removal rate reaches 58%. This study provides valuable insights into the clean and efficient recovery and reuse of petroleum coke–coal, offering a promising avenue for sustainable resource management.
Published Version
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