| Journal: | Quimica nova |
| Database: | PERIÓDICA |
| System number: | 000313204 |
| ISSN: | 0100-4042 |
| Authors: | Afonso, Julio Carlos1 Silva, Neocir da Salvato, Gustavo Nascimento Busnardo, Roberto Giovanini |
| Institutions: | 1Universidade Federal do Rio de Janeiro, Instituto de Quimica, Rio de Janeiro. Brasil |
| Year: | 2006 |
| Season: | Jul |
| Volumen: | 29 |
| Number: | 4 |
| Pages: | 856-861 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English 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 |
| Disciplines: | Química |
| Keyword: | Ingeniería metalúrgica, Química ambiental, Catalizadores agotados, Reciclaje, Recuperación de metales, Manejo de residuos |
| Keyword: | Chemistry, Metallurgical engineering, Environmental chemistry, Spent catalysts, Recycling, Metal recovery, Waste management |
| Full text: | Texto completo (Ver HTML) |
