| Revista: | Scientia Agricola |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000455481 |
| ISSN: | 0103-9016 |
| Autors: | Duarte, Lorrane Marques1 Xavier, Laura Vieira1 Rossati, Kamila Fernanda1 Oliveira, Vinícius Amaral de1 Schimicoscki, Raquel Stavale2 Avila-Neto, Cícero Naves de2 Mendes, Gilberto de Oliveira1 |
| Institucions: | 1Universidade Federal de Uberlandia, Instituto de Ciencias Agrarias, Monte Carmelo, Minas Gerais. Brasil 2Universidade Federal de Uberlandia, Faculdade de Engenharia Quimica, Uberlandia, Minas Gerais. Brasil |
| Any: | 2022 |
| Volum: | 79 |
| Número: | 2 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | Although Brazil is one of the world's leading exporter of agricultural products, the country is highly dependent on the importation of potassic fertilizers. K-bearing silicate rocks are reported as potential solutions to reduce external K dependency. This work evaluated K extraction from silicate Verdete rock, a glauconite-bearing rock containing 10 % of K2O, by solubilization with organic acids. Firstly, Verdete rock was reacted during 3-120 h with solutions of citric or oxalic acid at 2 % (m/v) in Erlenmeyer flasks by shaking. Oxalic acid extracted 6.5 % of K in Verdete, while citric acid extracted 2.3 %. Another experiment was performed to evaluate the effect of various oxalic acid concentrations (2, 4, 6, 8, and 10 %) and differing reaction times (12, 24, 48, and 72 h) on K extraction from Verdete rock. Soluble K concentration nearly doubled with the increase of reaction time from 12 to 72 h, rising from 20 to 37 mg L–1. Increments in K extraction were obtained by increasing oxalic acid concentrations up to 6 % and above this concentration, no significant gain was observed. The X-ray diffraction data showed that K extraction resulted from the formation of oxalate-metal complexes with metals in Verdete rock |
| Disciplines | Agrociencias, Geociencias |
| Paraules clau: | Fertilización, Mineralogía, petrología y geoquímica, Glauconita, Biolixiviación, Oxalatos |
| Keyword: | Fertilization, Mineralogy, petrology and geochemistry, Glauconite, Bioleaching, Oxalate |
| Text complet: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
