Kinetic investigation of reaction between ulexite ore and phosphoric acid

Doğan, H. Tuba; Yartaşı, Ahmet

doi:10.1016/j.hydromet.2008.11.006

Cited by 30 publications

(16 citation statements)

References 10 publications

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“…As a result, solid particles dissolve very well. 15 The non-catalytic reactions between solid and liquid have two ideal models: a) Progressive conversion, b) Unreacted shrinking-core models. 37,38 Shrinking-core consists of three models: a) Film diffusion, b) Surface chemical reaction, c) Diffusion through the ash or product layer.…”

Section: Resultsmentioning

confidence: 99%

“…If the rate is very sensitive to temperature variation, the rate-controlling step is the surface chemical model. 15 However, the results indicated that the variation of 1-(1-X) 1/3 versus time (t) had low linearity and the regression coefficient R 2 was smaller than 0.9999. Briefly, the dissolution did not fit the heterogeneous reaction models.…”

Section: Models Equations K Valuesmentioning

confidence: 88%

“…[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%

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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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Section: Resultsmentioning

confidence: 99%

Section: Models Equations K Valuesmentioning

confidence: 88%

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Investigation of Leaching Kinetics of Ulexite Waste in Oxalic Acid Solutions

Bayça¹

2014

Chem.Biochem.Eng.Q.

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“…Boric acid is used in two opposite locations as micronutrients in low concentrations fertilizers and as plant killers in high concentrations (Roskill, 1999;Smith, 1992). Studies have been made of the dissolution of ulexite in ammonium nitrate (Demirkiran et al 2009), phosphoric acid (Dogan and Yartasi, 2009), citric acid (Ekmekyapar et al, 2012), water saturated SO2 (Alkan and kocakerim, 1987), ammonia solutions saturated with CO2 , EDTA (Alkan et al, 2000), sulphuric acid (Tunc et al, 1999), thermally dehydrated ulexite in sulphuric acid solution and acetic acid (Kunkul et al 1999) were studied.…”

Section: Introductionmentioning

confidence: 99%

Production of boric acid from microwave-dehydrated ulexite waste by oxalic acid solution leaching

Koçan

Bayça

2020

Uluslararası Muhendislik Arastirma Ve Gelistirme Dergisi

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An investigation was made of the production of boric acid from microwave-dehydrated ulexite waste by leaching with oxalic acid solution. An ulexite waste sample was dehydrated in a domestic microwave oven, and then dissolved in oxalic solution at temperatures of between 25 and 70°C. The experimental data from this dissolution process were analyzed using homogeneous and heterogeneous kinetic models, and the leaching kinetics of the microwave-dehydrated ulexite waste were defined. The activation energy of the oxalic acid solution of the microwave-dehydrated ulexite waste was also calculated.

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“…Many studies concerning leaching of rocks with a variety of leaching solutions have been carried out (Awe et al, 2010;Demirkıran, 2009;Dogan and Yartasi, 2009;Mergen and Demirhan, 2009;Zhang and Nicol, 2010). Leaching of magnesite ore is generally done on industrial scale using hydrometallurgical reactors (Kennedy, 1996).…”

Section: Introductionmentioning

confidence: 99%