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Nickel metal extraction from hydrotreating catalyst waste is an attempt to recover purer Ni metal using extraction process. Emulsion liquid membrane with double surfactant was chosen because this extraction method has the highest separation efficiency, shorter time of process, and simple process steps. The double surfactant that was varied in this study was a mixture of Span 80 with Tween 20 and Span 80 with Tween 80. The experimental results showed that the best nickel extraction was obtained using Cyanex 272 extract with a concentration of 0.06 M, 8% (w / v) surfactant double Span 80 with Tween 20, with an internal phase ratio and organic phase of 1: 1. The extraction process lasts for 15 minutes with a stirring speed of 250 rpm.

In aligning to the rapid industrial development, the needs of catalyst nowadays are increasing. Oil and gas industry is one of the example especially in Continuous Catalytic Cracking Platforming Unit, in which the process produces Pt/Al2O3 catalyst waste approximately 2000-3000 kg/year and contains of 3200 ppm platinum metals. It becomes the reason why organic acid leaching and aqua regia leaching is needed to recover the platinum metals to save cost because its price is very expensive and spent catalyst waste is also considered as hazardous and toxic materials. In this experiment, there are two different methods used to obtain the recovery of platinum metals from spent Pt/Al2O3 catalyst. The methods used are leaching with oxalic acid and leaching with aqua regia. The experiment showed that leaching with aqua regia results in higher leaching efficiency percentage with the number of 19.917%. The result is obtained with operation temperature of 300oC and solid-liquid ratio of 20 g/L