Potassium extraction from the silicate rock Verdete using organic acids
| Autor: | Lorrane Marques Duarte, Laura Vieira Xavier, Kamila Fernanda Rossati, Vinícius Amaral de Oliveira, Raquel Stavale Schimicoscki, Cícero Naves de Ávila Neto, Gilberto de Oliveira Mendes |
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| Rok vydání: | 2022 |
| Předmět: |
0106 biological sciences
Agriculture (General) Potassium Oxalic acid chemistry.chemical_element glauconite 01 natural sciences Oxalate S1-972 law.invention chemistry.chemical_compound Erlenmeyer flask law Bioleaching oxalate Extraction (chemistry) 04 agricultural and veterinary sciences fertilizer Silicate chemistry 040103 agronomy & agriculture bioleaching 0401 agriculture forestry and fisheries Citric acid 010606 plant biology & botany Nuclear chemistry |
| Zdroj: | Scientia Agricola, Volume: 79, Issue: 2, Article number: e20200164, Published: 17 MAY 2021 Scientia Agricola, Vol 79, Iss 2 (2021) Scientia Agricola v.79 n.2 2022 Scientia Agrícola Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1678-992X |
| DOI: | 10.1590/1678-992x-2020-0164 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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