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Titolo:
Dissolution mechanism of ulexite in H2SO4 solution
Autore:
Tunc, M; Kocakerim, MM; Yapici, S; Bayrakceken, S;
Indirizzi:
Ataturk Univ, Muhendislik Fak, Kimya Muhendisligi Bolumu, TR-25240 Erzurum, Ataturk Univ Erzurum Turkey TR-25240 endisligi Bolumu, TR-25240 Erzurum, Yuzuncu Yil Univ, Fen Edebiyat Fak, Kimya Bolumu, Van, Turkey Yuzuncu Yil Univ Van Turkey Fen Edebiyat Fak, Kimya Bolumu, Van, Turkey Ataturk Univ, KK Egitim Fak, Kimya Bolumu, TR-25240 Erzurum, Turkey Ataturk Univ Erzurum Turkey TR-25240 ya Bolumu, TR-25240 Erzurum, Turkey
Titolo Testata:
HYDROMETALLURGY
fascicolo: 3, volume: 51, anno: 1999,
pagine: 359 - 370
SICI:
0304-386X(199903)51:3<359:DMOUIH>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
KINETICS; WATER;
Keywords:
H2SO4; ulexite; dissolution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Yapici, S Ataturk Univ, Muhendislik Fak, Kimya Muhendisligi Bolumu, TR-25240 Erzurum, Ataturk Univ Erzurum Turkey TR-25240 Bolumu, TR-25240 Erzurum,
Citazione:
M. Tunc et al., "Dissolution mechanism of ulexite in H2SO4 solution", HYDROMETALL, 51(3), 1999, pp. 359-370

Abstract

This work comprises an investigation of the dissolution mechanism of ulexite in H2SO4 solution and the effect of SO42- ions and acid concentration onthe dissolution process, using H2SO4, HCL + H2SO4 and H2SO4 + Na2SO4 solutions. From the experimental observations, it can be suggested that the overall dissolution reaction can be written asNa2O . 2CaO . 5B(2)O(3) . 16H(2)O((s)) + 3H(2)SO(4(aq))--> 2Na((aq))(+) + 2CaSO(4) + + 10H(3)BO(3(aq)) + SO4(aq)(2-) + 4H(2)O((1))orNa2O . 2CaO . 5B(2)O(3) . 16H(2)O((s)) + 3H(2)SO(4(aq))--> 2Na<INF>(aq</INF>)<SUP>+</SUP> + 2CaSO<INF>4</INF> . 2H<INF>2</INF>O<INF>(s</INF>) + 10H<INF>3</INF>BO<INF>3(aq</INF>) + SO<INF>4(aq</INF>)<SUP>2-</SUP>depending upon the experimental conditions. It was observed that, increasing H3O+ acid concentration increased the dissolution rate, but increasing SO42- concentration reduced dissolution rate due to the precipitation of a solid film of CaSO4 and/or CaSO4 . 2H(2)O, determined by X-ray and SEMmeasurement. (C) 1999 Elsevier Science B.V, All rights reserved.

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Documento generato il 07/07/20 alle ore 14:02:33