Factors controlling the kinetics of crystallization: supersaturation evolution in a porous medium. Application to barite crystallization

Geological Magazine - Tập 127 Số 6 - Trang 485-495 - 1990
Manuel Prieto Rubio1, Andrew Putnis2, Lurdes Fernández-Dı́az3
1Univ. Complut. Madrid, Dep. Crist. y Mineral., Madrid, Spain
2Department of Earth Sciences, University of#N# Cambridge, Cambridge, CB2 3EQ, England <>
3Departamento de Cristalografı́a y Mineralogı́a, Universidad Complutense de Madrid, 28040 Madrid, Spain

Tóm tắt

AbstractThe nucleation of barite has been studied in a system involving the doublediffusion of Ba2+and SO42-in an Na-rich aqueoussolution, through a porous medium. The evolution of the concentration profiles in the medium, which is a column of porous silica gel, has been determined as a function of time by direct chemical analysis of the diffusion-controlled mass transfer. By measuring the pH evolution, a Debye–Huckel treatment of ionic complexing has enabled the supersaturation evolution to be determined. The location of barite precipitation in the column is controlled both by the need to exceed a threshold supersaturation, as well as achieve an ‘equality range’ in which [Ba2+]/[SO42−] is close to unity. The value of the threshold supersaturation is a kinetic parameter and depends on the rate at which supersaturation increases. The experimental system described here has wide application to the study of crystallization phenomena in rocks. Experiments on the effect of additives designed to inhibit nucleation of barite in North Sea oil wells are used to quantify the resultant increase in supersaturation threshold.

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Tài liệu tham khảo

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Geological Magazine

Tập 127 Số 6

485-495

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