Crecimiento de cristales de celestina en gel de sílice. Transferencia de masa y criterios de cristalización
- Lourdes Fernández Díaz
- Carmen Zavala 1
- Ángeles San Miguel 1
- Sol López Andrés
- Manuel Prieto 1
- 1 Universidad Complutense de Madrid (Facultad de Ciencias Geológicas. Departamento de Cristalografía y Mineralogía)
ISSN: 0210-6558
Year of publication: 1990
Volume: 13
Issue: 0
Pages: 11-18
Type: Article
More publications in: Boletín de la Sociedad Española de Mineralogía
Abstract
The crystallization of celestine (SrS04) by silica gel technique has been studied. The experimental set up is a double diffussion-reaction system. Solutions of SiCl2 and Na2S 0 4 (0.5,0.3 y 0.1M) were used as reactives. The mass-transfer and the pH evolution along the gel column has been experimentally studied. Using these data, supersaturation values and ions concentration at nucleation time were calculated. Both parameters give the key to explain the first precipitate position and the nucleation kinetics. The crystallization technique used can be described as an “open system” whose physico-chemical characteristics change both along time and space. Their evolution leads to changes in crystal growth mechanisms that are reflected by the morphological evolution of the crystals.