recuperação de metais de catalisadores de hidrorrefino usados via fusão com khso4 recovery of elements from spent hydrorefining catalysts after fusion with khso4
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recuperação de metais de catalisadores de hidrorrefino usados via fusão com khso4 recovery of elements from spent hydrorefining catalysts after fusion with khso4

;Julio Carlos Afonso;Neocir da Silva;Gustavo Nascimento Salvato;Roberto Giovanini Busnardo
greece and rome 2006 Vol. 29 pp. 856-861
107
afonso2006qumicarecuperao

Abstract

This work describes a process for metal recovery from spent NiMo and CoMo/Al2O3 commercial hydrorefining catalysts. The samples were treated by fusion with potassium hydrogen sulfate (5 h, 600 ºC) with a KHSO4/catalyst mass ratio of 10:1. After fusion the solid was solubilized in water (100 ºC), leaving silicon compounds as residue. Losses of nickel and cobalt may reach 16 wt% of the amount present in the sample, depending on the silicon content. Soluble metals were isolated by selective precipitation techniques (nickel, cobalt, aluminum) or by solvent extraction with methyl-isobutyl ketone (molybdenum) in a hydrochloric acid medium. All metals were recovered in very good yields except for nickel and cobalt in the presence of considerable amounts of silicon. Soluble wastes consist of potassium/sodium sulfates/chlorides. Solid wastes correspond to about 4 wt% of the catalyst and can be discarded in industrial dumps.

Keywords

metal recovery spent catalysts

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DOI:
10.1590/S0100-40422006000400038
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http://www.scielo.br/scielo.php?script=sci_arttext...

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