Leaching of valuable metals from a spent nickel–tungsten-based hydrocracking catalyst and investigation of leaching kinetics

Aslan C., Zorağa M., Kalpaklı A. O., İlhan S.

CANADIAN METALLURGICAL QUARTERLY, sa.1, ss.1-11, 2025 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1080/00084433.2025.2580815
  • Dergi Adı: CANADIAN METALLURGICAL QUARTERLY
  • Derginin Tarandığı İndeksler: Scopus, Aerospace Database, Science Citation Index Expanded (SCI-EXPANDED), Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1-11
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Ni-W/Al2O3/SiO2 is a hydrocracking catalyst used in the petroleum industry. It can be used as a secondary resource for the production of Ni and W when discarded as waste. The leaching behaviour and kinetics of the spent Ni-W/Al2O3/SiO2 catalyst in a H2SO4 solution were investigated in this work. The effect of stirring speed, grinding, H2SO4 concentration, temperature and the solid/liquid ratio on the leaching was determined. The leaching rate of NiO and Al2O3 increased with increasing acid concentration and temperature, while a significant decrease occurred in the leaching rate of WO3 due to the formation of tungstic acid. Kinetic analysis on the experimental data showed that the Avrami Kinetic Model fits best to the results. Apparent activation energy, reaction rate constant and order of reaction values were calculated for the leaching of NiO and Al2O3. Model kinetic equations that give the fraction of compound leached as a function of time were derived.