| Texto completo | |
| Autor(es): |
Machaca, Darwin Michell Cheje
;
Salazar, Rosario Belen Juyo
;
de Carvalho, Thamyres Cardoso
;
Espinosa, Denise Crocce Romano
;
Tenorio, Jorge Alberto Soares
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MINERALS ENGINEERING; v. 232, p. 11-pg., 2025-10-01. |
| Resumo | |
An alternative approach for extracting Nb and Ta was investigated, based on the acid roasting of tin slags using the KHSO4-H2SO4 system, followed by oxalic leaching. Roasting experiments demonstrated the formation of soluble sulfated products, optimized through thermodynamic modeling: mineral grain size fraction -75 mu m, Slag-KHSO4-H2SO4 ratio 1:0.5:0.5 (g:g:ml), roasting temperature 300 degrees C, and roasting time 2 h. Under these conditions, the material conversion rate was maximized, characterized by mineralogical and morphological analyses that showed the chemical changes occurring during roasting helped explain the mechanisms at work during the process. After optimizing the treatment parameters by varying process conditions, it was found that approximately 94 % of Nb and 75 % of Ta were dissolved during the oxalic leaching stage, under the following conditions: concentration 0.5 mol L- 1, S/L ratio 50 g L- 1, reaction temperature 60 degrees C for 60 min. Consequently, this innovative alternative could reduce reagent and energy consumption, promoting a sustainable approach with a lower environmental footprint. (AU) | |
| Processo FAPESP: | 21/14842-0 - Elucidação do mecanismo de complexação de organometálicos entre extratantes orgânicos e elementos terras raras |
| Beneficiário: | Amilton Barbosa Botelho Junior |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 12/51871-9 - Estudo de novas tecnologias e rotas de processamento para o tratamento e reciclagem de resíduos sólidos |
| Beneficiário: | Jorge Alberto Soares Tenório |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/11866-5 - Desenvolvimento de processos inovadores para recuperação de metais críticos |
| Beneficiário: | Denise Crocce Romano Espinosa |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |