Thermodynamics of Tungsten Ores Decomposition Process Options

Leiting Shen; Xiaobin Li; Pekka Taskinen

doi:10.1007/978-3-319-95022-8_206

Thermodynamics of Tungsten Ores Decomposition Process Options

Leiting Shen, Xiaobin Li, Pekka Taskinen

Department of Chemical and Metallurgical Engineering

Central South University

Research output: Chapter in Book/Report/Conference proceeding › Chapter › Scientific › peer-review

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Abstract

The thermodynamics of tungsten ore decomposition in mineral acid and alkaline solutions were studied. The published thermodynamic data of tungsten minerals were collected and assessed. The Gibbs energies of CaWO4 (−1538.43 kJ/mol), FeWO4 (−1053.91 kJ/mol), MnWO4 (−1206.08 kJ/mol), H2WO4 (−1003.92 kJ/mol), and Na2WO4 (−1455.58 kJ/mol, aq) at 25 °C were adopted in the calculation using HSC software. The results show that CaWO4 is decomposed more readily in Na2CO3 solution than in NaOH, while FeWO4 and MnWO4 are more reactive in NaOH solutions. From a thermodynamic point of view, tungsten ore decomposes easily in acid solutions despite most ΔG o T ΔGTo increasing slightly with temperature. Oxidizing Fe2+ to Fe3+ in acidic solutions facilitates decomposition of FeWO4, and the reaction of CaWO4 in H2SO4 solution occurs more easily than in other mineral acids, due to the formation of sparsely soluble CaSO4. The results fit well with the experimental data and industrial experience previously reported in the literature.

Original language	English
Title of host publication	Extraction 2018
Subtitle of host publication	Proceedings of the First Global Conference on Extractive Metallurgy
Editors	Boyd Davis, M Moats, S Wang
Publisher	Springer
Pages	2441-2453
Number of pages	13
ISBN (Electronic)	978-3-319-95022-8
ISBN (Print)	978-3-319-95021-1
DOIs	https://doi.org/10.1007/978-3-319-95022-8_206
Publication status	Published - 2018
MoE publication type	A3 Book section, Chapters in research books
Event	Global Conference on Extractive Metallurgy - Ottawa, Canada Duration: 26 Aug 2018 → 29 Aug 2018 Conference number: 1 http://www.extractionmeeting.org/Extraction/Home/Extraction/Default.aspx?hkey=7b5c7a17-4f49-4312-a245-8178042aab43

Publication series

Name	The Minerals, Metals & Materials Series
Publisher	The Minerals, Metals & Materials Society
ISSN (Electronic)	2367-1696

Conference

Conference	Global Conference on Extractive Metallurgy
Country/Territory	Canada
City	Ottawa
Period	26/08/2018 → 29/08/2018
Internet address	http://www.extractionmeeting.org/Extraction/Home/Extraction/Default.aspx?hkey=7b5c7a17-4f49-4312-a245-8178042aab43

Keywords

Scheelite
Wolframite
Mineral acid
Alkaline media
Gibbs energy

Access to Document

10.1007/978-3-319-95022-8_206

CHEM-Shen-et al-Thermodynamics of Tungsten-2018-ExtractionAccepted author manuscript, 857 KBLicence: Unspecified

Raw Materials Research Infrastructure
Karppinen, M. (Manager)
School of Chemical Engineering
Facility/equipment: Facility

Cite this

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title = "Thermodynamics of Tungsten Ores Decomposition Process Options",

abstract = "The thermodynamics of tungsten ore decomposition in mineral acid and alkaline solutions were studied. The published thermodynamic data of tungsten minerals were collected and assessed. The Gibbs energies of CaWO4 (−1538.43 kJ/mol), FeWO4 (−1053.91 kJ/mol), MnWO4 (−1206.08 kJ/mol), H2WO4 (−1003.92 kJ/mol), and Na2WO4 (−1455.58 kJ/mol, aq) at 25 °C were adopted in the calculation using HSC software. The results show that CaWO4 is decomposed more readily in Na2CO3 solution than in NaOH, while FeWO4 and MnWO4 are more reactive in NaOH solutions. From a thermodynamic point of view, tungsten ore decomposes easily in acid solutions despite most ΔG o T ΔGTo increasing slightly with temperature. Oxidizing Fe2+ to Fe3+ in acidic solutions facilitates decomposition of FeWO4, and the reaction of CaWO4 in H2SO4 solution occurs more easily than in other mineral acids, due to the formation of sparsely soluble CaSO4. The results fit well with the experimental data and industrial experience previously reported in the literature.",

keywords = "Scheelite, Wolframite, Mineral acid, Alkaline media, Gibbs energy",

author = "Leiting Shen and Xiaobin Li and Pekka Taskinen",

year = "2018",

doi = "10.1007/978-3-319-95022-8_206",

language = "English",

isbn = "978-3-319-95021-1",

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publisher = "Springer",

pages = "2441--2453",

editor = "Boyd Davis and M Moats and S Wang",

booktitle = "Extraction 2018",

address = "Germany",

note = "Global Conference on Extractive Metallurgy ; Conference date: 26-08-2018 Through 29-08-2018",

url = "http://www.extractionmeeting.org/Extraction/Home/Extraction/Default.aspx?hkey=7b5c7a17-4f49-4312-a245-8178042aab43",

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Shen, L, Li, X & Taskinen, P 2018, Thermodynamics of Tungsten Ores Decomposition Process Options. in B Davis, M Moats & S Wang (eds), Extraction 2018: Proceedings of the First Global Conference on Extractive Metallurgy. The Minerals, Metals & Materials Series, Springer, pp. 2441-2453, Global Conference on Extractive Metallurgy, Ottawa, Ontario, Canada, 26/08/2018. https://doi.org/10.1007/978-3-319-95022-8_206

Thermodynamics of Tungsten Ores Decomposition Process Options. / Shen, Leiting; Li, Xiaobin; Taskinen, Pekka.
Extraction 2018: Proceedings of the First Global Conference on Extractive Metallurgy. ed. / Boyd Davis; M Moats; S Wang. Springer, 2018. p. 2441-2453 (The Minerals, Metals & Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Chapter › Scientific › peer-review

TY - CHAP

T1 - Thermodynamics of Tungsten Ores Decomposition Process Options

AU - Shen, Leiting

AU - Li, Xiaobin

AU - Taskinen, Pekka

N1 - Conference code: 1

PY - 2018

Y1 - 2018

N2 - The thermodynamics of tungsten ore decomposition in mineral acid and alkaline solutions were studied. The published thermodynamic data of tungsten minerals were collected and assessed. The Gibbs energies of CaWO4 (−1538.43 kJ/mol), FeWO4 (−1053.91 kJ/mol), MnWO4 (−1206.08 kJ/mol), H2WO4 (−1003.92 kJ/mol), and Na2WO4 (−1455.58 kJ/mol, aq) at 25 °C were adopted in the calculation using HSC software. The results show that CaWO4 is decomposed more readily in Na2CO3 solution than in NaOH, while FeWO4 and MnWO4 are more reactive in NaOH solutions. From a thermodynamic point of view, tungsten ore decomposes easily in acid solutions despite most ΔG o T ΔGTo increasing slightly with temperature. Oxidizing Fe2+ to Fe3+ in acidic solutions facilitates decomposition of FeWO4, and the reaction of CaWO4 in H2SO4 solution occurs more easily than in other mineral acids, due to the formation of sparsely soluble CaSO4. The results fit well with the experimental data and industrial experience previously reported in the literature.

AB - The thermodynamics of tungsten ore decomposition in mineral acid and alkaline solutions were studied. The published thermodynamic data of tungsten minerals were collected and assessed. The Gibbs energies of CaWO4 (−1538.43 kJ/mol), FeWO4 (−1053.91 kJ/mol), MnWO4 (−1206.08 kJ/mol), H2WO4 (−1003.92 kJ/mol), and Na2WO4 (−1455.58 kJ/mol, aq) at 25 °C were adopted in the calculation using HSC software. The results show that CaWO4 is decomposed more readily in Na2CO3 solution than in NaOH, while FeWO4 and MnWO4 are more reactive in NaOH solutions. From a thermodynamic point of view, tungsten ore decomposes easily in acid solutions despite most ΔG o T ΔGTo increasing slightly with temperature. Oxidizing Fe2+ to Fe3+ in acidic solutions facilitates decomposition of FeWO4, and the reaction of CaWO4 in H2SO4 solution occurs more easily than in other mineral acids, due to the formation of sparsely soluble CaSO4. The results fit well with the experimental data and industrial experience previously reported in the literature.

KW - Scheelite

KW - Wolframite

KW - Mineral acid

KW - Alkaline media

KW - Gibbs energy

U2 - 10.1007/978-3-319-95022-8_206

DO - 10.1007/978-3-319-95022-8_206

M3 - Chapter

SN - 978-3-319-95021-1

T3 - The Minerals, Metals & Materials Series

SP - 2441

EP - 2453

BT - Extraction 2018

A2 - Davis, Boyd

A2 - Moats, M

A2 - Wang, S

PB - Springer

T2 - Global Conference on Extractive Metallurgy

Y2 - 26 August 2018 through 29 August 2018

ER -

Thermodynamics of Tungsten Ores Decomposition Process Options

Abstract

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Keywords

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