Dissolution kinetics of ulexite in acetic acid solutions

Ekmekyapar, Ahmet; Demirkıran, Nizamettin; Künkül, Asım

doi:10.1016/j.cherd.2008.04.005

Cited by 54 publications

(35 citation statements)

References 38 publications

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“…(6)) (Alkan and Dogan, 2004;ZareNezhad, 2003), acetic acid (Eq. (7)) (Ekmekyapar et al, 2008;Ozmetin et al, 1996) and citric acid (Eq. (8)) (Ciftci, 2012), was investigated in terms of their B 2 O 3 extraction conditions.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Production of crystalline boric acid and sodium citrate from borax decahydrate

Elbeyli

2015

Hydrometallurgy

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Production of crystalline boric acid and sodium citrate from borax decahydrate

Elbeyli

2015

Hydrometallurgy

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“…The straight lines showed that ulexite waste dissolved adequately in oxalic acid. 12 Because ulexite waste was taken from a tailing pond in Bigadic, Balikesir, the particle size was not considered as a variable and was kept constant in this study. Calcium and sodium oxalates precipitated during the reaction.…”

Section: Models Equations K Valuesmentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15] During the leaching of ulexite in acid solutions, boric acid, B(OH) 3 , forms as a product, and sodium or calcium salts as a by-product. The boric acid remains in the liquid phase, and these insoluble salts are separated by filtration from the pregnant solution containing boric acid.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Leaching Kinetics of Ulexite Waste in Oxalic Acid Solutions

Bayça¹

2014

Chem.Biochem.Eng.Q.

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The dissolution of ulexite waste in oxalic acid solutions was studied in a batch reactor after characterization of the waste by X-ray diffraction (XRD) analysis and X-ray fluorescence (XRF) analysis. The dissolution parameters in this study were acid concentration, stirring rate, and reaction temperature. The experimental data were examined using homogeneous and heterogeneous kinetic models, and the dissolution kinetics of the waste was determined to be a first-order reaction control model. The activation energy of ulexite waste in oxalic acid solution was also calculated. It was observed that the dissolution rate increased with increasing reaction temperature, stirring rate and acid concentration. The kinetic model of the dissolution process was determined to be a first-order reaction control model. The activation energy was found to be 41.09 kJ mol -1 .

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“…Determinó que, en ambos casos, la reacción ocurre con control químico. Ekmekyapar et al (2008) estudiaron la cinética de disolución de ulexita en soluciones de ácido acético demostrando que la misma obedece al modelo del frente móvil. Tuba y Yartasi (2009) investigaron la cinética de reacción entre ulexita y ácido fosfórico demostrando que la velocidad de disolución es controlada por el proceso difusivo en la capa de producto que rodea al mineral.…”

Section: Introductionunclassified

Modelado Cinético de la Disolución de Hidroboracita en Soluciones de Ácido Nítrico

Morales

Quiroga

2012

Inf. tecnol.

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ResumenSe estudia la cinética de disolución de hidroboracita en soluciones de ácido nítrico, cuyos subproductos, nitrato de calcio y nitrato de magnesio, tienen una importante aplicabilidad comercial como fertilizantes. La disolución se realiza en un reactor tanque agitado discontinuo a presión atmosférica. Se investigan los efectos que tienen los factores temperatura, tamaño de partícula, relación sólido/líquido y concentración de ácido, sobre la velocidad de disolución; y se evalúan los parámetros cinéticos: factor de frecuencia y energía de activación. Se observa que la velocidad de disolución crece con el aumento de la temperatura, la disminución del tamaño de partícula, y con la disminución de la relación sólido/líquido. Se observa, también, que un aumento en la concentración del ácido nítrico hace aumentar, siempre, el grado de disolución. Se determina que la energía de activación aparente es del orden de 13 kJ/mol, siendo la disolución de la hidroboracita en ácido nítrico controlada por mecanismos difusivos. Palabras clave: hidroboracita, ácido nítrico, disolución, cinética, modelado Kinetics Modeling of Hydroboracite Dissolution in Nitric Acid Solutions AbstractThe dissolution kinetics of hydroboracite in nitric acid solutions, whose products, calcium nitrate and magnesium nitrate have important commercial applications as fertilizer was studied. The dissolution was carried out in a batch reactor at atmospheric pressure. The effects of the temperature, particle size, solid/liquid ratio and concentration of solution on the dissolution rate were investigated, and the kinetic parameters: frequency factor and activation energy were evaluated. It was found that the dissolution rate increased when the reaction temperature increased and when the particle size decreases. The dissolution rate decreases when the solid/liquid ratio increases. It was also found that an increasing in the acid concentration always increases the dissolution mineral rate. It was determined that the dissolution rate fit well to the diffusive control model and the activation energy of this dissolution process was found to be 13 KJ/mol.

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Dissolution kinetics of ulexite in acetic acid solutions

Cited by 54 publications

References 38 publications

Production of crystalline boric acid and sodium citrate from borax decahydrate

Production of crystalline boric acid and sodium citrate from borax decahydrate

Investigation of Leaching Kinetics of Ulexite Waste in Oxalic Acid Solutions

Modelado Cinético de la Disolución de Hidroboracita en Soluciones de Ácido Nítrico

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