Recovery of elements from spent hydrorefining catalysts after fusion with KHSO4

Quimica nova

Afonso, Julio Carlos¹  Salvato, Gustavo Nascimento¹  Silva, Neocir da¹  Busnardo, Roberto Giovanini¹ 

[1] Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil

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 describesa process for metal recovery from spent NiMo and CoMo/Al2O3commercial hydrorefining catalysts. The samples were treated by fusion withpotassium hydrogen sulfate (5 h, 600 ºC) with a KHSO4/catalystmass 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 reach16 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 yieldsexcept for nickel and cobalt in the presence of considerable amounts of silicon.Soluble wastes consist of potassium/sodium sulfates/chlorides. Solid wastescorrespond to about 4 wt% of the catalyst and can be discarded in industrialdumps.

【 授权许可】

CC BY