Leaching assessment of cemented bauxite tailings through wetting and drying cycles of durability test

Autor: Giovani Jordi Bruschi, Carolina Pereira dos Santos, William Mateus Kubiaki Levandoski, Suéllen Tonatto Ferrazzo, Eduardo Pavan Korf, Rodrigo Beck Saldanha, Nilo Cesar Consoli
Rok vydání: 2022
Předmět:
Zdroj: Environmental Science and Pollution Research. 29:59247-59262
ISSN: 1614-7499
0944-1344
DOI: 10.1007/s11356-022-20031-5
Popis: Disposal of mine tailings can cause negative environmental effects by releasing contaminants to surface and underground water. Alkali activation is a promising technique for immobilizing metals in stabilization/solidification of these wastes. This study evaluates the leaching behavior of cemented bauxite tailings (BT) submitted to weathering conditions. The alkali-activated binder was composed of sugar cane bagasse ash, carbide lime, and sodium hydroxide solution. Comparisons of the durability and leaching behavior of BT stabilized with alkali-activated binder and high initial strength Portland cement were performed. The durability results for alkali-activated were similar to the Portland cement, showing an average difference of 16%. Portland cement showed favorable results in the encapsulation of heavy metals like Cd and Hg, while the alkali-activated cement on Al, Cr, and Se. For Ba, Fe, Mn, and Zn immobilization, both types of cement presented an equal performance. The durability and leaching behavior of stabilized bauxite tailings is governed by the cement content and porosity of the blends, as well as their pH.
Databáze: OpenAIRE
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