Dissolution Modeling and Experimental Measurement of CaS-H2O Binary System
CaS formed during the retorting process of oil shale has a hazardous influence on surface water quality. Interaction of retorted oil shale with water generates highly alkaline leachate with a high content of sulfur due to the CaS component. A theoretical model describing the behavior of solid calciu...
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Published in | Chinese journal of chemistry Vol. 29; no. 11; pp. 2327 - 2336 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.11.2011
WILEY‐VCH Verlag Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | CaS formed during the retorting process of oil shale has a hazardous influence on surface water quality. Interaction of retorted oil shale with water generates highly alkaline leachate with a high content of sulfur due to the CaS component. A theoretical model describing the behavior of solid calcium sulfide in contact with water was developed. The model was consistent with the measurements showing change in dissolution behavior when solid CaS remained in the solution. Experimental measurements of pH and concentrations of ions were carried out in oxygen‐free water at 25°C using CaS concentrations from 24.2–131.5 mg·L−1 (0.335–1.823 mmol/L). Analysis of pH and concentrations of ions in the solution and calculations by the developed model showed that the solubility of CaS was estimated as 125.0 mg·L−1 (1.733 mmol/L), and therefore the solubility product of CaS is 3.41×10−10 (mo·L−1)2 at a temperature of 25°C.
The scheme of the system of solid CaS in equilibrium with water. |
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Bibliography: | istex:0F7578C86660C5CF4841061034097BF223B632E2 ArticleID:CJOC201180399 the Ministry of Education and Research of the Republic of Estonia - No. SF0180135s08 ark:/67375/WNG-2LDZZ7TB-S |
ISSN: | 1001-604X 1614-7065 |
DOI: | 10.1002/cjoc.201180399 |