| Texto completo | |
| Autor(es): |
Costa, Raquel H.
;
Vinhal, Jonathan T.
;
Scarazzato, Tatiana
;
Espinosa, Denise C. R.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF SUSTAINABLE MINING; v. 24, n. 4, p. 22-pg., 2025-01-01. |
| Resumo | |
Resource recovery is a process that has been used to obtain products from industrial waste. Mining tailings can be used as an alternative through ore beneficiation to create by-products for this type of waste. The work herein investigated the recovery of two products from a real tailing generated in the Zn beneficiation route in the flotation step. A non-magnetic fraction was submitted to a hydrometallurgical route to produce MgSO4 and CaSO4. Thermodynamic simulations using FactSage software were performed to evaluate the optimal leaching conditions varying the S:L ratio, the sulfuric acid concentration, and temperature. The best modeled conditions for pure dolomite were established in 1.2 mol L-1 H2SO4, S:L ratio 1:10, at room temperature, showing 100% Mg extraction. The simulation with the real composition showed 100% Mg extraction using 1.0 mol L-1 H2SO4, S:L ratio 1:10, at room temperature. Experimental leaching tests led to Mg and Ca extraction yields of 72% +/- 5 and 2%, respectively, obtained at 50 degrees C in 35 min. The cementation step resulted in 92.3% of Cd removal from the leach liquor with Zn:Cd ratio of 100:1 in 5 min at 25 degrees C. The obtained by-products were CaSO4 and solubilized MgSO4. Both are potentially usable for agriculture purposes, being magnesium sulfate a secondary macronutrient as fertilizer, and CaSO4 as a soil conditioner. (AU) | |
| 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 |