A comprehensive investigation of the interaction mechanism between the rubber seed oil and copper slag: Pyrolysis kinetic, product release and phase transition of copper slag

The interaction mechanism between copper slag and rubber seed oil throughout the reaction process, including pyrolysis characteristics, pyrolysis kinetics, evolution of gaseous and liquid products and evolution of copper slag fractions are investigated. The "rubber seed oil + copper slag" pyrolysis temperature range from 562.89 K to 768.47 K. According to the results of online monitoring of gaseous products, the ability to release C = O and C-O is significantly reduced. This indicates that copper slag can promote the transformation of phenols, alcohols, and ethers. Besides, a redox reaction between the H2 and CH4, C2H2 and CO from rubber seed oil and the metal oxides in the copper slag. This causes a reduction in the spectral intensity of the H2 and CH4, C2H2 and CO that from the pyrolysis process. The OCs content of pyrolysis oil at high temperatures increases significantly under the effect of copper slag, while the hydrocarbon content decreases. According to the XPS and EPMA of copper slag, Fe3O4 and divalent copper compounds in the copper dregs are reduced. Cu (II) and Fe (III) are transformed to Cu (I) and Fe (II). This study provides insights into co-processing of copper slag and rubber seed oil to promote integrated and clean utilization of resources.