Viscoelasticity of Quartz and Kaolin Slurries in Seawater: Importance of Magnesium Precipitates
Author
Jeldres, Matías; Piceros Fuentes, Eder Cristóball; Robles Vásquez, Pedro Adrián; Toro Villarroel, Norman Rodrigo; Jeldres Valenzuela, Ricardo IvánKnowledge Area
Química-FísicaTecnologías del Medio AmbienteSponsors
Ricardo I. Jeldres thanks Conicyt Fondecyt 11171036 and Centro CRHIAM Project Conicyt/Fondap/15130015. The authors are grateful for the contribution of the Scientific Equipment Unit—MAINI of the Universidad Católica del Norte for facilitating the XRD analysis. Pedro Robles thanks the Pontificia Universidad Católica de Valparaíso for the support provided. This research was funded by Conicyt Fondecyt 11171036 and Centro CRHIAM Project Conicyt/Fondap/15130015Realizado en/con
Universidad Politécnica de Cartagena; Universidad Católica del NortePublication date
2019-10-19Publisher
MDPIBibliographic Citation
Jeldres M, Piceros E, Robles PA, Toro N, Jeldres RI. Viscoelasticity of Quartz and Kaolin Slurries in Seawater: Importance of Magnesium Precipitates. Metals. 2019; 9(10):1120. https://doi.org/10.3390/met9101120Peer review
SiKeywords
ViscoelasticityQuartz
Kaolin
Seawater
Magnesium precipitates
Abstract
In this study, the viscoelastic properties of quartz and kaolin suspensions in seawater were analysed considering two distinct conditions: pH 8 and 10.7. Creep and oscillatory sweep tests provided the rheological parameters. An Anton Paar MCR 102 rheometer (ANAMIN Group, Santiago, Chile) was used with a vane-in-cup configuration, and the data were processed with RheoCompass (TM) Light software (ANAMIN Group, Santiago, Chile). The outcomes were associated with the formation of solid species principally composed of magnesium precipitates. The magnesium in solution reduced in the presence of quartz (68 wt %), from 1380 to 1280 mg/L. Since the difference was not large regarding the solid-free seawater, the disposition of solid complexes at pH 10.7 was expected to be similar. The jump in pH caused both yield stress and viscoelastic moduli to drop, suggesting that the solid precipitates diminished the strength of the particle networks that made up the suspension. For the kaolin slurries (37 ...
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