Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite

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Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite. / Shen, Leiting; Li, Xiaobin; Zhou, Qiusheng; Peng, Zhihong; Liu, Guihua; Qi, Tiangui; Taskinen, Pekka.

julkaisussa: Journal of Cleaner Production, Vuosikerta 197, 01.10.2018, s. 690-698.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Shen, Leiting ; Li, Xiaobin ; Zhou, Qiusheng ; Peng, Zhihong ; Liu, Guihua ; Qi, Tiangui ; Taskinen, Pekka. / Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite. Julkaisussa: Journal of Cleaner Production. 2018 ; Vuosikerta 197. Sivut 690-698.

Bibtex - Lataa

@article{51d5ae1daeeb438dae8f607203fdcefd,
title = "Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite",
abstract = "To directly obtain solution of (NH4)2WO4 instead of Na2WO4 is the key for developing a cleaner technology of ammonium paratungstate production. In this paper, ammoniacal ammonium carbonate solution was adopted for leaching tungsten from the converted product, a mixture of H2WO4 and CaSO4 obtained by treating scheelite with sulfuric acid. The research indicates that tungsten can be efficiently extracted in form of ammonium tungstate solution with WO3 leaching yield of >99.5{\%} under moderate leaching conditions. The WO3 leaching yield is influenced by the transformation of calcium sulfate to calcium carbonate due to forming CaWO4 through the secondary reaction between CaSO4 and (NH4)2WO4, whereas an excess (NH4)2CO3 (≥0.64 mol/L) can suppress the secondary reaction by facilitating the transformation. Additionally, the consumed ammonium carbonate can be recovered by treating the leaching residue with ammonium sulfate solution at above 70 °C. This work presents a cleaner and sustainable technique for producing ammonium paratungstate, with circulating the leaching reagents and bypassing the conversion of Na2WO4 to (NH4)2WO4.",
keywords = "Ammonium paratungstate, Calcium carbonate, Calcium sulfate, Leaching mechanism, Tungstic acid",
author = "Leiting Shen and Xiaobin Li and Qiusheng Zhou and Zhihong Peng and Guihua Liu and Tiangui Qi and Pekka Taskinen",
year = "2018",
month = "10",
day = "1",
doi = "10.1016/j.jclepro.2018.06.256",
language = "English",
volume = "197",
pages = "690--698",
journal = "Journal of Cleaner Production",
issn = "0959-6526",

}

RIS - Lataa

TY - JOUR

T1 - Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite

AU - Shen, Leiting

AU - Li, Xiaobin

AU - Zhou, Qiusheng

AU - Peng, Zhihong

AU - Liu, Guihua

AU - Qi, Tiangui

AU - Taskinen, Pekka

PY - 2018/10/1

Y1 - 2018/10/1

N2 - To directly obtain solution of (NH4)2WO4 instead of Na2WO4 is the key for developing a cleaner technology of ammonium paratungstate production. In this paper, ammoniacal ammonium carbonate solution was adopted for leaching tungsten from the converted product, a mixture of H2WO4 and CaSO4 obtained by treating scheelite with sulfuric acid. The research indicates that tungsten can be efficiently extracted in form of ammonium tungstate solution with WO3 leaching yield of >99.5% under moderate leaching conditions. The WO3 leaching yield is influenced by the transformation of calcium sulfate to calcium carbonate due to forming CaWO4 through the secondary reaction between CaSO4 and (NH4)2WO4, whereas an excess (NH4)2CO3 (≥0.64 mol/L) can suppress the secondary reaction by facilitating the transformation. Additionally, the consumed ammonium carbonate can be recovered by treating the leaching residue with ammonium sulfate solution at above 70 °C. This work presents a cleaner and sustainable technique for producing ammonium paratungstate, with circulating the leaching reagents and bypassing the conversion of Na2WO4 to (NH4)2WO4.

AB - To directly obtain solution of (NH4)2WO4 instead of Na2WO4 is the key for developing a cleaner technology of ammonium paratungstate production. In this paper, ammoniacal ammonium carbonate solution was adopted for leaching tungsten from the converted product, a mixture of H2WO4 and CaSO4 obtained by treating scheelite with sulfuric acid. The research indicates that tungsten can be efficiently extracted in form of ammonium tungstate solution with WO3 leaching yield of >99.5% under moderate leaching conditions. The WO3 leaching yield is influenced by the transformation of calcium sulfate to calcium carbonate due to forming CaWO4 through the secondary reaction between CaSO4 and (NH4)2WO4, whereas an excess (NH4)2CO3 (≥0.64 mol/L) can suppress the secondary reaction by facilitating the transformation. Additionally, the consumed ammonium carbonate can be recovered by treating the leaching residue with ammonium sulfate solution at above 70 °C. This work presents a cleaner and sustainable technique for producing ammonium paratungstate, with circulating the leaching reagents and bypassing the conversion of Na2WO4 to (NH4)2WO4.

KW - Ammonium paratungstate

KW - Calcium carbonate

KW - Calcium sulfate

KW - Leaching mechanism

KW - Tungstic acid

UR - http://www.scopus.com/inward/record.url?scp=85049895388&partnerID=8YFLogxK

U2 - 10.1016/j.jclepro.2018.06.256

DO - 10.1016/j.jclepro.2018.06.256

M3 - Article

VL - 197

SP - 690

EP - 698

JO - Journal of Cleaner Production

JF - Journal of Cleaner Production

SN - 0959-6526

ER -

ID: 26678637