Leaching kinetics of colemanite in ammonium hydrogen sulphate solutions

Guliyev, Rövşen; Kuşlu, Soner; Çalban, Turan; Çolak, Sabri

doi:10.1016/j.jiec.2012.01.044

Cited by 16 publications

(10 citation statements)

References 18 publications

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“…For a leaching system, it is recognized that the rate constant k can be expressed as eq , where k 0 is the pre-exponential factor, E a is the activation energy, M is the reaction order to the acid concentration, and N is the reaction order to the solid/liquid ratio S / L . ,− The natural logarithm of eq yields eq , which shows that the plot of ln k vs 1/ T is a straight line with a slope − E a / R if the sulfuric acid concentration and the solid/liquid ratio are kept constant. On the basis of the values of k determined in Figure , at a sulfuric acid concentration of 0.5 M and a solid/liquid ratio of 1/20 g/mL, a straight line is obtained in Figure with a correlation coefficient of 0.988.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of Vanadium Leaching from a Spent Industrial V₂O₅/TiO₂ Catalyst by Sulfuric Acid

Liu

2014

Ind. Eng. Chem. Res.

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Recovery of vanadium from various sources is important to the environment and industry. This work investigates vanadium leaching from a spent selective catalytic reduction catalyst by sulfuric acid at atmospheric pressure. It includes the effects of stirring speed, solid to liquid ratio, temperature, and sulfuric acid concentration on the vanadium recovery yield. The results show that the vanadium recovery yield increases with increases in temperature, sulfuric acid concentration, and leaching time and decreases with an increase in solid to liquid ratio. The leaching data can not be described well by kinetic models commonly adopted for similar processes in the literature. The Avrami equation, originally developed for crystallization, is found to be most suitable. The leaching is controlled by diffusion in the solid with an activation energy of 5.90 kJ/mol.

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Section: Resultsmentioning

confidence: 99%

Kinetics of Vanadium Leaching from a Spent Industrial V₂O₅/TiO₂ Catalyst by Sulfuric Acid

Liu

2014

Ind. Eng. Chem. Res.

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“…Bu sorunların bertaraf edilebilmesi için literatürde çeşitli çözücülerle yapılan birçok çalışma mevcuttur. Guliyev ve arkadaşları çözücü olarak amonyum hidrojen sülfat çözeltisi kullanmış ve aktivasyon enerjisini 32,66 kJ.mol -1 olarak belirlemişlerdir [11]. Çavuş ve Kuşlu tarafından yapılan çalışmada kolemanit sitrik asit çözeltisi ile çözülmüş, reaksiyon modelinin ürün film boyunca difüzyon modeline uyduğu tespit edilmiş ve aktivasyon enerjisi 28,66 kJ.mol -1 olarak hesaplanmıştır [12].…”

Section: Investigation Of Dissolution Kinetics Of Colemanite In Sodiu...unclassified

Investigation of Kinetic Mechanism of Colemanite in Sodiumbisulfate Solution

Şimşek¹,

Yeşilyurt²

2021

Journal of Boron

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Bu çalışmada kolemanitin sodyum bisülfat çözeltisi içerisindeki çözünme kinetiğine; katı/sıvı oranı, sodyum bisülfat (NaHSO 4 ) konsantrasyonu, tane boyutu, karıştırma hızı ve reaksiyon sıcaklığı parametrelerinin etkisi incelenmiştir. Deneysel sonuçlara göre, kolemanitin çözünürlüğünün sıcaklığın ve konsantrasyonun artması ile arttığı, tane boyutunun ve katı/sıvı oranının artması ile azaldığı tespit edilmiştir. Karıştırma hızının çözünme kinetiği üzerine etkisi, 350 devir.dakika -1 değerine kadar olumlu, yaklaşık 350 devir.dakika -1 'den sonraki değerlerde ise olumsuz olduğu bulunmuştur. Deneysel veriler sabit boyutlu parçacıklar için reaksiyona girmemiş çekirdek modeline göre analiz edilmiştir. Çözünmenin kül filminden iki aşamalı difüzyon kontrollü olduğu bulunmuştur. Aktivasyon enerjileri bir ve ikinci aşamalarda sırasıyla 3,4 ve 6,1 kJ.mol -1 olarak bulunmuştur.

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“…Boron minerals are mainly compounds which consist of boron oxide with alkaline and/or alkaline earth metal oxides, and they exist in more than 230 forms in nature. Boron and its compounds are potentially valuable products for industry and have strategic importance (Elcicek et al, 2014;Guliyev et al, 2012). It is the most widely used element in engineering applications and in industry, such as nuclear engineering, manufacturing of high-quality steel, ceramics, textiles; in the production of heat resistant polymers, cosmetics; processing of leather, rubber, paint; and in agriculture, or used as catalyst (Guliyev et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Leaching kinetics of ulexite ore in aqueous medium at different CO 2 partial pressures

Elçiçek

Kocakerìm

2018

Braz. J. Chem. Eng.

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This manuscript presents a study regarding the leaching kinetics of ulexite (Na 2 O.2CaO.5B 2 O 3 .16H 2 O) under different CO 2 partial pressures in aqueous media. The effects of the reaction temperature, particle size, CO 2 partial pressure, solid-liquid ratio, and agitation speed were investigated in the boron extraction from the ore. As a result of the experimental studies, it was found that the leaching rate increased with the rise in the reaction temperature and CO 2 partial pressure, and decreased with the increase in the particle size and solid-liquid ratio. The reaction temperature was found to be a significant parameter affecting the leaching rate, which varied from 13% to 97% between 303 and 393 K. Agitation speed appears to have no significant effect on the leaching rate. By using several empirical kinetic models to correlate the experimental data, it was found that the leaching rate fits to the Avrami Model. The activation energy of the process is found to be 21.1 kJ.mol-1 .

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Leaching kinetics of colemanite in ammonium hydrogen sulphate solutions

Cited by 16 publications

References 18 publications

Kinetics of Vanadium Leaching from a Spent Industrial V₂O₅/TiO₂ Catalyst by Sulfuric Acid

Kinetics of Vanadium Leaching from a Spent Industrial V₂O₅/TiO₂ Catalyst by Sulfuric Acid

Investigation of Kinetic Mechanism of Colemanite in Sodiumbisulfate Solution

Leaching kinetics of ulexite ore in aqueous medium at different CO 2 partial pressures

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Leaching kinetics of colemanite in ammonium hydrogen sulphate solutions

Cited by 16 publications

References 18 publications

Kinetics of Vanadium Leaching from a Spent Industrial V2O5/TiO2 Catalyst by Sulfuric Acid

Kinetics of Vanadium Leaching from a Spent Industrial V2O5/TiO2 Catalyst by Sulfuric Acid

Investigation of Kinetic Mechanism of Colemanite in Sodiumbisulfate Solution

Leaching kinetics of ulexite ore in aqueous medium at different CO 2 partial pressures

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Kinetics of Vanadium Leaching from a Spent Industrial V₂O₅/TiO₂ Catalyst by Sulfuric Acid

Kinetics of Vanadium Leaching from a Spent Industrial V₂O₅/TiO₂ Catalyst by Sulfuric Acid