Crystal Research and Technology
Cryst. Res. Technol. 43, 616 (2008) - Abstract -

Behavior of LiOH.H2O crystals obtained by evaporation and by drowning out

N. T. A. Graber, J. W. Morales, P. A. Robles, H. R. Galleguillos, and M. E. Taboada

Centro de Investigación Científica y Tecnológica para la Minería (CICITEM), Departamento de Ingeniería Química, Universidad de Antofagasta, Av. Angamos 601, Antofagasta, Chile

Keywords lithium hydroxide, crystallization, crystal polymorphism
PACS 81.10.-h
DOI 10.1002/crat.200711110

In the present work, the behavior of crystals derived from two different crystallization methods applied in a concentrated aqueous lithium salt solution was studied. The LiOH.H2O crystals obtained by a simple evaporation (Crystal I) differed in terms of morphology and solubility from those precipitated from lithium hydroxide solutions by addition of ethanol as a co-solvent (Crystal II). Solubility of Crystal II at different temperatures (15 to 35°C) and mass ratios of ethanol to water (0 to 0.1) was determined. Polymorphic like behavior of these crystals was evidenced from X-ray diffraction patterns. Measurement of density, refractive index, absolute viscosity and electrical conductivity of saturated solutions are reported. A thermodynamic analysis in terms of the Chen model for the calculation of activity coefficients, indicate that the polymorphic system in water and in water + ethanol (ethanol/water ratio 0.1) is enantiotropic.




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