Solubilization of Potassium From Alternative Rocks by Humic and Citric Acids and Coffee Husk

Pessoa, Rodrigo Souza; Silva, Carlos Alberto; Moretti, Bruno Silva; Neto, Antônio Eduardo Furtini; Inda, Alberto Vasconcellos; Curi, Nilton

doi:10.1590/s1413-70542015000600002

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…In these circumstances, Brazil has pioneered investigations of novel sources of K from silicate rocks. Recent work has focused on Ôverdete,Õ a glauconite and feldspar-bearing metamorphic rock that contains 5-15% K 2 O (www.verdefertilizantes.com.br; Santos et al 2015), and syenite (12-14% K 2 O; Pessoa et al 2015;Ciceri et al 2017). Laboratory studies show that K release from silicates is very slow (verdete: Silva et al 2012;syenite: Ciceri et al 2017), although innovative approaches to measuring dissolution (Ciceri and Allanore 2015) have shown rates 10-100 times greater than achieved in batch leaching experiments.…”

Section: Novel Sources Of K As a Crop Nutrientmentioning

confidence: 99%

“…Laboratory studies show that K release from silicates is very slow (verdete: Silva et al 2012;syenite: Ciceri et al 2017), although innovative approaches to measuring dissolution (Ciceri and Allanore 2015) have shown rates 10-100 times greater than achieved in batch leaching experiments. A number of approaches have been taken to compensate for slow reaction rates by milling, or by liberating K from the mined silicate through calcining with fluxes or acid leaching (verdete: Santos et al 2015;nepheline syenite: Jena et al 2014;Pessoa et al 2015;feldspar: Wang et al 2014). These add to manufacturing processes the cost of reagent and energy inputs.…”

Section: Novel Sources Of K As a Crop Nutrientmentioning

confidence: 99%

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Innovation in Resourcing Geological Materials as Crop Nutrients

Manning

2017

Nat Resour Res

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Mineral resources are fundamental to the growth and development of human society. Extraction of metal ores has risen very slightly as a proportion of all resources, while construction and industrial mineral extraction has grown much more rapidly. This reflects growth in GDP, which is much faster than population growth, in turn reflecting improved standards of living, growth in urban housing/infrastructure and growth in the consumer society. Fertilizer minerals in particular are essential resources for production of the food needed by an increasing global population. Nitrogen fertilizer manufacture requires fossil fuels-especially natural gas (methane) as a source of the hydrogen needed for the HaberBosch process. Phosphate fertilizers are predominantly manufactured using phosphate rock as a source of phosphoric acid, and there is scope to recover phosphorus from contaminated waters. Potassium fertilizers are produced from evaporite deposits, mainly in the global north. It is difficult for poorer countries with deeply leached soils to access and make efficient use of existing conventional products. Globally, while N and P fertilizer application replaces the nutrient removed by crops and so is in balance, twice as much K is being removed from soils as is being replaced. This leads to the need for innovation in developing novel sources of K, especially to support agricultural production in the global south. Rocks containing K silicate minerals (such as feldspar and nepheline) occur widely as potential sources of K for use in soils where these minerals weather rapidly. Observations of surface corrosion in feldspars taken from soils after 10 years exposure to soil microbial systems demonstrates rates of dissolution 4 orders of magnitude greater than determined in the laboratory. Innovation in use of these minerals depends on an understanding of the role of microbial processes in silicate mineral decomposition.

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Section: Novel Sources Of K As a Crop Nutrientmentioning

confidence: 99%

Section: Novel Sources Of K As a Crop Nutrientmentioning

confidence: 99%

Innovation in Resourcing Geological Materials as Crop Nutrients

Manning

2017

Nat Resour Res

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“…These organic acids can weaken the mineral structure and release rock components through acidulation and complexation of cations (Gadd, 2017a;Stumm, 1986). There are reports on citric acid as a K extractor from K-bearing silicate rocks (Pessoa et al, 2015;Santos et al, 2015a); however, information on oxalic acid effectiveness is scarce. Citric and oxalic acid could possibly dissolve minerals in Verdete rock and thus release K. This research evaluated K extraction from Verdete rock using organic acids involved in mineral solubilization.…”

Section: Introductionmentioning

confidence: 99%

Potassium extraction from the silicate rock Verdete using organic acids

Duarte

Xavier

Rossati

et al. 2022

Sci. agric. (Piracicaba, Braz.)

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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.

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“…Thus, in the growing seasons of 2017, the production of 44,970,000 bags of processed coffee in Brazil (CONAB, 2017) may have generated approximately 2.7 million tons of coffee husk, of which approximately 820 thousand tons in the South and Midwest regions of Minas Gerais. Accordingly, there is a need to find alternative uses for this organic waste, to prevent environmental pollution problems (ZOCA et al, 2014;PESSOA et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Early Growth of Coffee Plants and Soil Fertility Properties in Response to Coffee Husk Application

Mantovani

Paula

Rezende

et al. 2018

C.Sci.

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Coffee processing generates large amounts of husk, which can be used as organic fertilizer if technical criteria are considered. This study investigated the effect of coffee husk, applied to or incorporated into the soil, on soil fertility properties, early crop growth and nutrient accumulation in coffee plants. The experiment analyzed coffee plants in a greenhouse in pots, in randomized blocks, in a 5x2 factorial arrangement plus a control treatment, with four replicates. The treatments consisted of the combination of five coffee husk rates (3.5; 7; 14; 28, and 56 t ha-1), applied in two forms: spread on the surface or incorporated into the soil, plus the control treatment, without husk application. Portions of 7 dm 3 soil were blended with lime, phosphate fertilizer, as well as coffee husk rates in the treatments with residue incorporation, and incubated for 30 days. Thereafter, one coffee seedling per plot was planted, the coffee husk rates were applied on the soil surface for the treatments without residue incorporation, and the plants were left to grow for 180 days. Coffee husk applied to or incorporated into the soil surface increases the K and organic matter contents of the soil, intensifies the early growth of coffee plants and accelerates N and K accumulation in the plant shoots. The application of coffee husk on the surface is more indicated than its incorporation into the soil, and the best rate at coffee planting is equivalent to 20 t ha-1 .

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Solubilization of Potassium From Alternative Rocks by Humic and Citric Acids and Coffee Husk

Cited by 11 publications

References 15 publications

Innovation in Resourcing Geological Materials as Crop Nutrients

Innovation in Resourcing Geological Materials as Crop Nutrients

Potassium extraction from the silicate rock Verdete using organic acids

Early Growth of Coffee Plants and Soil Fertility Properties in Response to Coffee Husk Application

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