Modeling precipitation from concentrated solutions with the EQ3/6 chemical speciation codes

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One of the more important uncertainties of using chemical speciation codes to study dissolution and precipitation of compounds is the results of modeling which depends on the particular thermodynamic database being used. The authors goal is to investigate the effects of different thermodynamic databases on modeling precipitation from concentrated solutions. They used the EQ3/6 codes and the supplied databases to model precipitation in this paper. One aspect of this goal is to compare predictions of precipitation from ideal solutions to similar predictions from nonideal solutions. The largest thermodynamic databases available for use by EQ3/6 assume that solutions behave ideally. However, ... continued below

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Brown, L. F. & Ebinger, M. H. January 13, 1995.

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One of the more important uncertainties of using chemical speciation codes to study dissolution and precipitation of compounds is the results of modeling which depends on the particular thermodynamic database being used. The authors goal is to investigate the effects of different thermodynamic databases on modeling precipitation from concentrated solutions. They used the EQ3/6 codes and the supplied databases to model precipitation in this paper. One aspect of this goal is to compare predictions of precipitation from ideal solutions to similar predictions from nonideal solutions. The largest thermodynamic databases available for use by EQ3/6 assume that solutions behave ideally. However, two databases exist that allow modeling nonideal solutions. The two databases are much less extensive than the ideal solution data, and they investigated the comparability of modeling ideal solutions and nonideal solutions. They defined four fundamental problems to test the EQ3/6 codes in concentrated solutions. Two problems precipitate Ca(OH){sub 2} from solutions concentrated in Ca{sup ++}. One problem tests the precipitation of Ca(OH){sub 2} from high ionic strength (high concentration) solutions that are low in the concentrations of precipitating species (Ca{sup ++} in this case). The fourth problem evaporates the supernatant of the problem with low concentrations of precipitating species. The specific problems are discussed.

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Medium: P; Size: 12 p.

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OSTI; NTIS; GPO Dep.

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  • Waste management `95,Tucson, AZ (United States),26 Feb - 2 Mar 1995

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  • Other: DE95006264
  • Report No.: LA-UR--95-201
  • Report No.: CONF-950216--46
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 10118678
  • Archival Resource Key: ark:/67531/metadc1274904

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  • January 13, 1995

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  • Oct. 12, 2018, 6:44 a.m.

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  • Nov. 13, 2018, 1:20 p.m.

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Brown, L. F. & Ebinger, M. H. Modeling precipitation from concentrated solutions with the EQ3/6 chemical speciation codes, article, January 13, 1995; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1274904/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.