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Crystallization of iron fluoride trihydrate from mixed acid solutions
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena.ORCID iD: 0000-0002-3239-5188
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , x, 51 p.
Series
Trita-KET, ISSN 1104-3466 ; 216
Keyword [en]
Physical chemistry
Keyword [sv]
Fysikalisk kemi
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-347ISBN: 91-7178-079-3 (print)OAI: oai:DiVA.org:kth-347DiVA: diva2:9272
Presentation
2005-06-02, K2, Teknikringen 28, Stockholm, 10:00
Supervisors
Note
QC 20110114Available from: 2005-08-01 Created: 2005-08-01 Last updated: 2011-01-14Bibliographically approved
List of papers
1. Solubility of beta-FeF3 center dot 3H(2)O in mixtures of nitric and hydrofluoric acid
Open this publication in new window or tab >>Solubility of beta-FeF3 center dot 3H(2)O in mixtures of nitric and hydrofluoric acid
2006 (English)In: Journal of Chemical and Engineering Data, ISSN 0021-9568, E-ISSN 1520-5134, Vol. 51, no 1, 223-229 p.Article in journal (Refereed) Published
Abstract [en]

The solubility of beta-FeF(3) center dot 3H(2)O has been measured in solutions with different concentrations of nitric acid (0 to 7 in) and hydrofluoric acid (1 to 6 m) at the temperatures of (30, 40, and 50) degrees C. The total iron concentration at equilibrium was measured with inductively coupled plasma (ICP) spectroscopy. The solubility was evaluated in terms of the stepwise complexation of iron by fluoride ions at different ionic strength and temperature. The solubility of beta-FeF3-3H(2)O increases with decreasing concentration of HF and HNO3 and increasing temperature.

Place, publisher, year, edition, pages
Royal Inst Technol, Dept Chem Engn & Technol, SE-10044 Stockholm, Sweden.: , 2006
Keyword
STRONG ELECTROLYTES, CRYSTAL-STRUCTURE, FLUORIDE, MOSSBAUER, FE(III), BETA-FEF3.3H2O, THERMODYNAMICS, 25-DEGREES-C, TRIHYDRATE, FEF3.3H2O
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-14093 (URN)10.1021/je050347n (DOI)000234671500042 ()2-s2.0-31444431895 (Scopus ID)
Note
QC 20100713Available from: 2010-07-13 Created: 2010-07-13 Last updated: 2017-12-12Bibliographically approved
2. Crystal growth kinetics of iron fluoride trihydrate
Open this publication in new window or tab >>Crystal growth kinetics of iron fluoride trihydrate
2006 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 296, no 2, 213-220 p.Article in journal (Refereed) Published
Abstract [en]

Crystal growth of beta-FeF3 • 3H(2)O has been investigated in mixtures of 3 mol kg(-1) hydrofluoric acid and 3 mol kg(-1) nitric acid at 30, 40 and 50 degrees C. Seeded isothermal desupersaturation experiments have been performed in the range: 1.3 < S < 3.6. Solution samples were analysed for total iron concentration with inductively coupled plasma atomic emission spectroscopy. The true supersaturation driving force was estimated by a proper speciation using the software SSPEC using appropriate stability constants. Growth rate parameters of the BCF surface diffusion growth rate equation and the empirical power-law equation have been estimated by fitting the supersaturation balance equation using a nonlinear optimization procedure. The results show that the growth rate is surface integration controlled. The growth rate at a supersaturation ratio of 2 was found to be 3.5 x 10(-12) m s(-1) at 30 degrees C, 7.4 x 10(-12) m s(-1) at 40 degrees C and 16 x 10(-12) m s(-1) at 50 degrees C. The activation energy of the rate constant of crystal growth was found to be 61 kJ mol(-1). .

Place, publisher, year, edition, pages
Royal Inst Technol, Dept Chem Engn & Technol, KTH, S-10044 Stockholm, Sweden.: , 2006
Keyword
growth from solutions, acids, inorganic compounds, WATER EXCHANGE, BETA-FEF3.3H2O, DISSOLUTION, FEF3.3H2O, MOSSBAUER, IRON(III), MIXTURES
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-14094 (URN)10.1016/j.jcrysgro.2006.08.035 (DOI)000242325300014 ()2-s2.0-33750515216 (Scopus ID)
Note
QC 20100713Available from: 2010-07-13 Created: 2010-07-13 Last updated: 2017-12-12Bibliographically approved
3. Crystallization of beta-FEF3.3H2O in mixtures of nitric and hydrofluoric acid
Open this publication in new window or tab >>Crystallization of beta-FEF3.3H2O in mixtures of nitric and hydrofluoric acid
2005 (English)In: VDI-Berichte 1901, V D I Verlag GmbH , 2005, 17-22 p.Conference paper, Published paper (Refereed)
Abstract [en]

The solubility of β-heh 3·3H 2U has been measured in solutions with a range of different hydrofluoric acid concentrations (2, 4 and 6 mol/kg) and constant nitric acid concentration (3 mol/kg) in order to calculate a solubility constant applicable at the present ionic strength and temperature. Crystal growth of β-FeF 3·3H 2O has been measured in 3molal hydrofluoric acid and 3molal nitric acid solutions at 50°C by performing seeded isothermal desupersaturation experiments (1 < S < 3). The supersaturation was recorded by taking out solution samples which were analysed for total iron concentration with inductively coupled plasma atomic emission spectrometry (ICP-AES). The true supersaturation driving force was estimated by a proper speciation to account for the complexation, using the software SSPEC and relevant stability constants. Parameters of a desired growth rate equation were estimated by fitting the supersaturation balance equation directly to the supersaturation measurements. The results show that growth of β-FeF 3·3H 2O follows a parabolic rate law (g= 2,0 ±0,2). The growth rate at S= 2 was found to be 4,6×10- 11 m/s (50°C). The growth order and the low value of the growth rate suggest that the rate is surface integration controlled.

Place, publisher, year, edition, pages
V D I Verlag GmbH, 2005
Series
VDI - Berichte, ISSN 0083-5560 ; 1901
Keyword
Atomic emission spectrometry, Isothermal desupersaturation, Solution samples, Supersaturation balance
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-28455 (URN)2-s2.0-27344433300 (Scopus ID)
Conference
16th International Symposium on Industrial Crystallization 11th - 14th September 2005, International Congress Center dresden/Germany
Note

QC 20110114

Available from: 2011-01-14 Created: 2011-01-14 Last updated: 2014-04-07Bibliographically approved

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