Study on the shielding of harmful components in spent FCC catalyst tailings

The sodium roasting-water leaching process, the primary method for recycling valuable metals in spent FCC catalysts, has been industrialized and has good economic benefits. However, it also presents a significant challenge. Every ton of waste processed by the FCC catalyst will produce 0.75 tons of tailings, mainly containing silicon-aluminum-based substances, residual valuable metals, and other harmful components. These spent FCC catalyst tailings are listed as hazardous in the 'National List of Hazardous Wastes.' The need for harmless tailings disposal is crucial for its resource utilization and to mitigate its environmental impact. This study, which focuses on the resource characteristics of silicon-aluminum-based substances in spent FCC catalyst tailings, develops a method to shield harmful components and solve the resource utilization problem, which can significantly impact the waste management field. The research has laid a theoretical foundation for hazardous waste's harmless disposal and resource utilization.