Leaching of nickel from spent catalysts in hydrochloric acid solutions
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Wrocław University of Technology
Publication date: 2008-01-01
Physicochem. Probl. Miner. Process. 2008;42(1):177–184
The results of hydrochloric acid leaching of nickel from spent catalysts used for methanation of small quantities of carbon oxide from hydrogen and ammonia synthesis gases (RANG-19), as well as for hydrogenation of benzene to cyclohexane (KUB-3) are reported. The effects of acid concentration, temperature, solid-to-liquid ratio and reaction time on nickel and aluminium leaching were examined. The leaching of nickel is more affected by temperature in the case of KUB-3 catalyst than RANG-19. After one hour leaching at 60oC in 3.0M HCl solution the extraction of nickel from RANG-19 catalyst amounts to 74%, whereas for KUB-3 after 45 min of leaching extraction of nickel is 99%. The highest leaching efficiency of nickel from both the catalysts are found to be: 3.0M HCl solution, tem- perature 60oC, solid to liquid ratio of 1/10, particle size 3-8 mm. In these conditions 99% of nickel is extracted from KUB-3 catalyst after 3 hours of leaching, and 98% of nickel from RANG-19 after 4 hours of leaching, respectively.