Potassium extraction from the silicate rock Verdete using organic acids

Abstract

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 K 2 O, 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.

Chemical properties of soils submitted to the application of a bioactivator and basalt and serpentinite powders

“…Other authors have also reported the benefits of the gradual availability of nutrients over time by remineralizers (Grecco et al, 2013;Anda et al, 2015). (Duarte et al, 2022). These results suggest different times of addition of remineralizers, depending on the purpose (acidity corrector or fertilizer).…”

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Intelligent System for Monitoring Water Content and Solute Concentrations in Soil Cultivated with Fertigated Lisianthus

“…In modern cultivation under protected conditions, plants are supplied with nutrient solutions rather than simply irrigation water. However, the excess nutrient solution draining below the root zone contains considerable levels of nutrients that may be considered to be pollutants [4,11] as well as a waste of financial resources.…”