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On the effect of carbonate on barite growth at elevated temperatures

Nuria Sanchez-Pastor, Melanie Kaliwoda, Sabino Veintemillas-Verdaguer and Guntram Jordan
On the effect of carbonate on barite growth at elevated temperatures
American Mineralogist (July 2013) 98 (7): 1235-1240

Abstract

The effect of carbonate on the growth of barite {001} surfaces from aqueous solutions supersaturated with respect to barite (Omega (sub barite) approximately 12) was studied by hydrothermal atomic force microscopy (HAFM) and Raman spectroscopy at temperatures ranging from 25 to 70 degrees C. The experiments showed that the effects of carbonate depend on the specific location of growth. For mono-layers growing on pristine barite, the carbonate-additive promotes growth and the spreading rate of two-dimensional islands increases with temperature. However, growth is inhibited in layers growing on surfaces, which grew in carbonate-containing solution. The threshold carbonate concentration necessary to completely inhibit growth is inversely correlated with temperature. Raman spectroscopy revealed the presence of carbonate within crystals, which grew in carbonate-containing solution. Judging by these findings, incorporation of carbonate into the structure of growing barite as a thermally activated process likely is a controlling factor, which inhibits barite growth. Thus the study shows that additives can exert opposing effects on growth not only depending on additive concentration but also depending on the specific growth location. The implication of this work, therefore, is that bimodal effects of additives on crystal growth occur more frequently than generally recognized. The insights into the mechanisms of such bimodal effects of additives can significantly contribute to the understanding and predictability of the kinetics of macro-scale processes such as barite scale formation or the behavior of barium sulfate in CO (sub 2) -sequestration fluids.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 98
Serial Issue: 7
Title: On the effect of carbonate on barite growth at elevated temperatures
Affiliation: Universidad Complutense de Madrid, Departamento de Cristalografia y Mineralogia, Madrid, Spain
Pages: 1235-1240
Published: 201307
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 46
Accession Number: 2013-061395
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Mineralogische Staatssammlung Muenchen, DEU, GermanyInstituto de Ciencia de Materiales de Madrid, ESP, SpainLudwig-Maximilians-Universitaet, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201337
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