The behaviour of tannic acid adsorption on fluorite surface: isotherm, kinetic and thermodynamic studies

• Autorzy: Tangarfa Mariam , Semlali Aouragh Hassan Naoul

Identyfikatory

DOI

10.37190/ppmp/144288

• Języki publikacji: EN

Abstrakty

EN

Fluorite is an important mineral to produce hydrofluoric acid. As fluorite resources contain calcite as a gangue mineral, the separation between these two calcium containing minerals is difficult. Tannic acid is the most commonly used reagent as a depressant to separate fluorite from calcite by flotation. To enhance this separation, it is so primordial to understand tannic acid physicochemical reactivity via these minerals. Therefore, the aim of this work is to investigate the mechanism of tannic acid adsorption on the fluorite surface by experimental study using isotherm, kinetic and thermodynamic. Adsorption isotherm modelling results showed that the adsorption process is well described by Sips model. On the other hand, the kinetic and thermodynamic require firstly the adsorption study as a function of three main reactional parameters including initial tannic acid concentration, solution pH and temperature. This study showed that acidic pH as well as initial tannic acid concentration increase and temperature decrease promote the studied adsorption. These finding were then exploited to determine the adsorption mechanism by pseudo n order kinetic model adjustment to experimental kinetic data using nonlinear regression method. Obtained high correlation coefficient and low mean absolute error at 95 % confidence level showed good agreement of experimental kinetic data with the tested model. These results revealed that the mechanism of tannic acid adsorption onto fluorite was attributed to a chemical reaction. In addition, the thermodynamic study showed that the studied adsorption process was exothermic.

Słowa kluczowe

EN

fluorite; tannic acid; adsorption; kinetic; modelling; isotherm; thermodynamics; reactional parameters

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2022
• Tom: Vol. 58, iss. 1
• Strony: 77--87
• Opis fizyczny: Bibliogr. 44 poz., rys., tab., wykr.

Twórcy

autor

Tangarfa Mariam

• Mohammadia School of Engineering, Mohamed V University in Rabat, Department of Industrial Process, B.P 765, 10090 Agdal Rabat, Morocco

autor

Semlali Aouragh Hassan Naoul

• Mohammadia School of Engineering, Mohamed V University in Rabat, Department of Industrial Process, B.P 765, 10090 Agdal Rabat, Morocco
• Mohammadia School of Engineering, Mohamed V University in Rabat, Department of Industrial Process and Civil Engineering, B.P 765, 10090 Agdal Rabat, Morocco

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