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Hydrometallurgical Processing and Recovery of Nickel from Spent Catalyst with HCl and Aqua Regia

[ Ahmad Jamshidi Bonab ] - M.Sc Student, Applied Chemistry
[ S. Aahmad Hosseini ] - Ph.D. Chemical Engineering
[ M.Ali Khalilzadeh ] - Ph.D. Organic Chemistry

خلاصه مقاله:

The nickel based catalysts are conventionally used in process of refinery. After
periodical use of the catalysts, due to poisoning effect of foreign material and impurities,
which deposit on the surface of the catalyst, they will become inactive. In such cases,
fresh catalysts have to be substituted and the spent catalyst will be discarded as waste
material. Spent catalysts are harmful for the environment and the nickel is a precious
element, so the particular attention is paid to the recycling of spent catalyst. This study
investigates the possibility of recovering nickel from the spent catalyst (NiO/Al2O3)
resulting from the steam reforming in Tabriz refinery. In the extraction process, nickel is
recovered using hydrochloric acid and aqua regia as a solvent. The considered
parameters effecting nickel recovery were acid concentration, temperature and time of
reaction, solid : liquid ratio, particle size and stirring rate, then experimental was
performed and determined optimum condition. The results obtained show that extraction
of about 87.41% and 81% for HCl and aqua regia is achieved, respectively.

Spent catalyst - Leaching - Nickel recovery - Hydrometallurgy