Kinetics and mechanism of one-step reductive leaching of manganese oxide ores by EDTA/EDTA-2Na

Zhang, C.; Wang, S.; Cao, Z.; Zhong, H.

doi:https://doi.org/10.5277/ppmp1887

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Tytuł artykułu

Kinetics and mechanism of one-step reductive leaching of manganese oxide ores by EDTA/EDTA-2Na

Autorzy

Zhang C. , Wang S. , Cao Z. , Zhong H.

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DOI

https://doi.org/10.5277/ppmp1887

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Abstrakty

In this research, the kinetics and mechanism of one-step reductive leaching of manganese oxide ores by ethylenediaminetetraacetic acid (EDTA) or its disodium salt (EDTA-2Na) in an aqueous medium have been investigated. The kinetic data of this reductive leaching process may be described by the Avrami model, and the apparent activation energy was determined to be 15.8 kJ·mol-1/7.9 kJ·mol-1 for leaching by EDTA/EDTA-2Na with a reaction order of -1.7/2.0. The EDTA/EDTA-2Na leach liquor characterized and analyzed by X-ray photoelectron spectra (XPS), Fourier transform infrared spectra (FTIR), and total organic carbon (TOC) determination denoted that the oxidation-reduction reaction happened between manganese(IV) and EDTA/EDTA-2Na, and a coordination complex, EDTA-manganese(II/III) formed. This new process can be easily used to leach manganese from manganese oxide ores in a moderate environment with the pH range of 5–8.

Słowa kluczowe

kinetics EDTA reductive leaching manganese oxide ores EDTA-2Na

Wydawca

Oficyna Wydawnicza Politechniki Wrocławskiej

Czasopismo

Physicochemical Problems of Mineral Processing

Rocznik

2018

Tom

Vol. 54, iss. 3

Strony

858--867

Opis fizyczny

Bibliogr. 38 poz.

Twórcy

autor

Zhang C.

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China
Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, China

autor

Wang S.

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China
Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, China

autor

Cao Z.

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China
Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, China

autor

Zhong H.

zhongh@csu.edu.cn

Central South University, College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China
Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, China

Bibliografia

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