Recovery of elements from spent hydrorefining catalysts after fusion with KHSO4

Química Nova

Afonso, Julio Carlos¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹  Salvato, Gustavo Nascimento¹  Silva, Neocir da¹  Busnardo, Roberto Giovanini¹ 

关键词: spent catalysts;    metal recovery;    waste management.;   

DOI  :  10.1590/S0100-40422006000400038

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown