pH measurements in high-temperature hydrometallurgical systems

V. G. Papangelakis, D. S. Seneviratne, Z. Jankovic, Xiangyang Zhou, S. N. Lvov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The implementation of a flow-through yttria-stabilized zirconia (YSZ) sensor for pH measurements in high temperature and concentrated electrolyte systems relevant to hydrometallurgical processing of nickeliferous laterites is discussed. Instrumentation involved the use of a custom made flow-through titanium electrochemical cell. Accuracy and validity of the pH measurements at temperatures up to 250°C were assessed using concentrated sulphate process solutions ranging from synthetic binary sulphuric acid water solutions to progressively multicomponent metal - sulphate solutions simulating laterite Pressure Acid Leach conditions. The measurements were also compared with theoretical models using recently obtained thermodynamic data. A difference of ±0.25 pH units was observed between measured and calculated pH values at temperatures. This is an acceptable difference given that these are the first direct high temperature pH measurements ever on the concentrated acidic sulphate solutions. This result is encouraging more research for the development of industrial electrochemical systems for direct pH measurements in autoclaves.

Original languageEnglish
Title of host publicationProceedings of the TMS Fall Extraction and Processing Conference
EditorsC. Young, A. Alfantazi, C. Anderson, A. James
Pages645-656
Number of pages12
Volume1
StatePublished - Dec 1 2003
Externally publishedYes
EventHydrometallurgy 2003: Proceedings of the 5th International Symposium - Vancouver, BC, Canada
Duration: Aug 24 2003Aug 27 2003

Other

OtherHydrometallurgy 2003: Proceedings of the 5th International Symposium
CountryCanada
CityVancouver, BC
Period8/24/038/27/03

Fingerprint

Sulfates
Temperature
Acids
Electrochemical cells
Yttria stabilized zirconia
Autoclaves
Titanium
Electrolytes
Metals
Thermodynamics
Water
Sensors
Processing

ASJC Scopus subject areas

  • Filtration and Separation

Cite this

Papangelakis, V. G., Seneviratne, D. S., Jankovic, Z., Zhou, X., & Lvov, S. N. (2003). pH measurements in high-temperature hydrometallurgical systems. In C. Young, A. Alfantazi, C. Anderson, & A. James (Eds.), Proceedings of the TMS Fall Extraction and Processing Conference (Vol. 1, pp. 645-656)

pH measurements in high-temperature hydrometallurgical systems. / Papangelakis, V. G.; Seneviratne, D. S.; Jankovic, Z.; Zhou, Xiangyang; Lvov, S. N.

Proceedings of the TMS Fall Extraction and Processing Conference. ed. / C. Young; A. Alfantazi; C. Anderson; A. James. Vol. 1 2003. p. 645-656.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Papangelakis, VG, Seneviratne, DS, Jankovic, Z, Zhou, X & Lvov, SN 2003, pH measurements in high-temperature hydrometallurgical systems. in C Young, A Alfantazi, C Anderson & A James (eds), Proceedings of the TMS Fall Extraction and Processing Conference. vol. 1, pp. 645-656, Hydrometallurgy 2003: Proceedings of the 5th International Symposium, Vancouver, BC, Canada, 8/24/03.
Papangelakis VG, Seneviratne DS, Jankovic Z, Zhou X, Lvov SN. pH measurements in high-temperature hydrometallurgical systems. In Young C, Alfantazi A, Anderson C, James A, editors, Proceedings of the TMS Fall Extraction and Processing Conference. Vol. 1. 2003. p. 645-656
Papangelakis, V. G. ; Seneviratne, D. S. ; Jankovic, Z. ; Zhou, Xiangyang ; Lvov, S. N. / pH measurements in high-temperature hydrometallurgical systems. Proceedings of the TMS Fall Extraction and Processing Conference. editor / C. Young ; A. Alfantazi ; C. Anderson ; A. James. Vol. 1 2003. pp. 645-656
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