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The influence of hydrofluoric acid and nitric acid on the growth kinetics of iron(III) fluoride trihydrate
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.ORCID iD: 0000-0002-3239-5188
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena.
2015 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 423, 16-21 p.Article in journal (Refereed) Published
Abstract [en]

The influence of hydrofluoric acid and nitric acid concentration on the growth rate of beta-FeF3 center dot 3H(2)O crystals has been studied in different hydrofluoric acid (4.7-10.7 mol/(kg H2O)) and nitric acid (2.1-4.6 mol/(kg H2O)) mixtures at 50 degrees C. Seeded desupersaturation experiments were performed and the results were evaluated by considering the chemical speciation using two different speciation programs. The growth rate at 50 degrees C at a supersaturation ratio of 2, expressed in terms of free FeF3, was found to be in the range of (0.4-3.8) x 10(-11) m/s. The growth rate order was found to be two or higher in all experiments. The low growth rate and high growth rate order indicate that the growth rate is governed by the surface integration step. The growth rate was found to be independent of variations in acid concentrations: this is in accordance with the assumption of a surface integration controlled growth rate.

Place, publisher, year, edition, pages
2015. Vol. 423, 16-21 p.
Keyword [en]
Growth from solutions, Acids, Inorganic compounds
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-172218DOI: 10.1016/j.jcrysgro.2015.04.023ISI: 000355199500003OAI: oai:DiVA.org:kth-172218DiVA: diva2:848485
Funder
Swedish Energy Agency
Note

QC 20150825

Available from: 2015-08-25 Created: 2015-08-14 Last updated: 2017-12-04Bibliographically approved

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Forsberg, Kerstin M.

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