Recovery of nickel oxide from spent catalyst of palm oil mill indsutrial waste by leaching treatment
2008
J. Idris | K.H. Ku Hamid
Malaysia is the world's largest palm oil producer which estimated about 50% of world production. One of the industrial processes in palm oil refinery is the hydrogenation process, which nickel is used as a catalyst. A bench scale study was performed to treat nickel recovery from the spent catalyst resulting from the hydrogenation process in palm oil mill industrial waste by leaching treatment. The characteristic of the waste, performed by ICP-OES, XRD and chemical analysis showed a high recovery of nickel beside others heavy metal contents in the sludge, such as TiO, MgNiO, CuNiO and LiO. In the leaching process, nickel is recovered using H2S04 and few parameters affecting nickel recovery has been considered such as H2S04 acid concentration, solid: liquid ratio, temperature and time of digestion. The result obtained showed that maximum extraction of about 98% of nickel was achieved by leaching process using < 500 micron particle size of spent catalyst with 11 M (61%) H2S04 concentration at a ratio 1: 14 solid liquid by weight at a reaction temperature of 100°C for 160 minute reaction time.
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