| Texto completo | |
| Autor(es): |
Zamengo, Fernanda Gusman Garreta
;
Botelho, Amilton Barbosa
;
Seckler, Marcelo Martins
;
Espinosa, Denise Crocce Romano
;
Tenorio, Jorge Alberto Soares
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | METALS; v. 15, n. 7, p. 13-pg., 2025-06-26. |
| Resumo | |
This study aims to increase the particle size of the precipitate, aiming for an increasing settling speed. The effluent contains 21.88 g/L of sulfate, 526.5 mg/L of calcium, 2.9 mg/L of cadmium, 4.73 g/L of magnesium, 332.8 mg/L of manganese, and 205.8 mg/L of zinc. Based on thermodynamic simulations, evaluating the pH increase up to 9.0, it was possible to determine that the main species are CaSO4<middle dot>2H2O(s), Mg(OH)2(s), MnO2(s), ZnO(s), and Cd(OH)2(s). In the precipitation tests, it was determined that a concentration of 2.0 mol/L of Ca(OH)2 resulted in a particle size of 12.2 mu m. The increase of temperature has an opposite effect, decreasing 40% of the particle size at 80 degrees C in comparison to 25 degrees C. On the other hand, the reaction time increases particle size, reaching 300% of an increase from 10 min to 3 h. In the seed tests, it was found that a seed ratio of 10 g/L to 100 g/L with the CaSO4 (2) seed had the greatest impact on particle size growth, resulting in a 700% increase in particle size compared to the test without seeds. In the settling tests, a sedimentation rate of 177 mL/min was achieved using seeds and flocculants, compared to 50 mL/min in the test without reagents. (AU) | |
| 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 |