Characterization of verdete rock as a potential source of potassium
Potassium is a nutrient found at low levels in Brazilian soils, requiring large inputs of fertilizers to achieve satisfactory crop yields. Brazil has high external dependence and limited reserves of soluble K mineral, which is traditionally exploited for the production of fertilizers. On the other hand, it is common the occurrence in the country of potassium-rich silicate minerals which are not commercially exploited. This study aimed to characterize mineralogically and chemically samples of verdete rock separated into size fractions and evaluate its potential as potassium fertilizer. The mineral composition of verdete rock is based on glauconite, quartz and feldspar. The total K2O content in verdete rock ranged from 5.18 to 9.0 dag/kg. The K content extracted in water or 2% citric acid was 2.4% below the total of K, indicating low reactivity of verdete rock and limitations for direct use as K source. The processes of physical fractionation and sedimentation in water are inefficient to promote the concentration of K in the different verdete rock fractions. The total K content in some samples are considerable and may enable the use of this rock as raw material for production of more reactive potassium fertilizers.
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Universidade Federal de Viçosa
2015
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oai:scielo:S0034-737X20150004003922015-09-04Characterization of verdete rock as a potential source of potassiumSantos,Wedisson OliveiraMattiello,Edson MarcioCosta,Liovando Marciano daAbrahão,Walter Antônio Pereira glauconite K fertilizer Potassium is a nutrient found at low levels in Brazilian soils, requiring large inputs of fertilizers to achieve satisfactory crop yields. Brazil has high external dependence and limited reserves of soluble K mineral, which is traditionally exploited for the production of fertilizers. On the other hand, it is common the occurrence in the country of potassium-rich silicate minerals which are not commercially exploited. This study aimed to characterize mineralogically and chemically samples of verdete rock separated into size fractions and evaluate its potential as potassium fertilizer. The mineral composition of verdete rock is based on glauconite, quartz and feldspar. The total K2O content in verdete rock ranged from 5.18 to 9.0 dag/kg. The K content extracted in water or 2% citric acid was 2.4% below the total of K, indicating low reactivity of verdete rock and limitations for direct use as K source. The processes of physical fractionation and sedimentation in water are inefficient to promote the concentration of K in the different verdete rock fractions. The total K content in some samples are considerable and may enable the use of this rock as raw material for production of more reactive potassium fertilizers.info:eu-repo/semantics/openAccessUniversidade Federal de ViçosaRevista Ceres v.62 n.4 20152015-08-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2015000400392en10.1590/0034-737X201562040009 |
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Santos,Wedisson Oliveira Mattiello,Edson Marcio Costa,Liovando Marciano da Abrahão,Walter Antônio Pereira |
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Santos,Wedisson Oliveira Mattiello,Edson Marcio Costa,Liovando Marciano da Abrahão,Walter Antônio Pereira Characterization of verdete rock as a potential source of potassium |
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Santos,Wedisson Oliveira Mattiello,Edson Marcio Costa,Liovando Marciano da Abrahão,Walter Antônio Pereira |
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Santos,Wedisson Oliveira |
title |
Characterization of verdete rock as a potential source of potassium |
title_short |
Characterization of verdete rock as a potential source of potassium |
title_full |
Characterization of verdete rock as a potential source of potassium |
title_fullStr |
Characterization of verdete rock as a potential source of potassium |
title_full_unstemmed |
Characterization of verdete rock as a potential source of potassium |
title_sort |
characterization of verdete rock as a potential source of potassium |
description |
Potassium is a nutrient found at low levels in Brazilian soils, requiring large inputs of fertilizers to achieve satisfactory crop yields. Brazil has high external dependence and limited reserves of soluble K mineral, which is traditionally exploited for the production of fertilizers. On the other hand, it is common the occurrence in the country of potassium-rich silicate minerals which are not commercially exploited. This study aimed to characterize mineralogically and chemically samples of verdete rock separated into size fractions and evaluate its potential as potassium fertilizer. The mineral composition of verdete rock is based on glauconite, quartz and feldspar. The total K2O content in verdete rock ranged from 5.18 to 9.0 dag/kg. The K content extracted in water or 2% citric acid was 2.4% below the total of K, indicating low reactivity of verdete rock and limitations for direct use as K source. The processes of physical fractionation and sedimentation in water are inefficient to promote the concentration of K in the different verdete rock fractions. The total K content in some samples are considerable and may enable the use of this rock as raw material for production of more reactive potassium fertilizers. |
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Universidade Federal de Viçosa |
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2015 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2015000400392 |
work_keys_str_mv |
AT santoswedissonoliveira characterizationofverdeterockasapotentialsourceofpotassium AT mattielloedsonmarcio characterizationofverdeterockasapotentialsourceofpotassium AT costaliovandomarcianoda characterizationofverdeterockasapotentialsourceofpotassium AT abrahaowalterantoniopereira characterizationofverdeterockasapotentialsourceofpotassium |
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