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2011 | 13 | 2 | 23-28
Tytuł artykułu

The effect of reaction conditions on the precipitation of sodium hexafluorosilicate produced from waste hexafluorosilicic acid

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The purpose of the study is to investigate the optimum conditions for the precipitation of sodium hexafluorosilicate (Na2SiF6) from waste hexafluorosilicic acid, an effluent from the phosphoric acid industry. Sodium chloride and sodium hydroxide were used as reactants to produce Na2SiF6. The effect of various parameters on the precipitation was investigated and includes; the molar ratio of the reactants, contact time, the temperature and the effect of seeding.The optimum reaction conditions were found to be as follows; excess sodium chloride or sodium hydroxide to hexafluorosilicic acid of 25%, contact time 40 minutes and a reaction temperature of 40°C.The reaction of hexafluorosilicic acid with an aqueous solution of sodium chloride at optimum conditions gave a maximum yield of 94.26% Na2SiF6 while the reaction of hexafluorosilicic acid with the aqueous solution of sodium hydroxide at optimum conditions gave a maximum yield of 97.3% Na2SiF6. The X-Ray diffraction (XRD) analysis reveals that the only crystals present in the precipitate are Na2SiF6. Also, Scanning Electron Microscope (SEM) analysis shows that the different morphology of these crystals depend on the precipitation conditions.
Wydawca

Rocznik
Tom
13
Numer
2
Strony
23-28
Opis fizyczny
Daty
wydano
2011-01-01
online
2011-06-16
Twórcy
  • Faculty of Engineering, Department of Chemical Engineering, Al-Hussein Bin Talal University, Ma'an, Jordan
  • Faculty of Engineering, Department of Mining Engineering, Al-Hussein Bin Talal University, Ma'an, Jordan
Bibliografia
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  • Bulanov, A.D., Pryakhin, D.A. & Balabanov, V.V. (2003). Preparation of High-Purity Silicon Tetrafluoride by Thermal Dissociation of Na2SiF6. Russ. J. Appl. Chem. 76(9), 1393-1395. DOI: 10.1023/B:RJAC.0000012654.22326.e5.[Crossref]
  • Carleton, K.L., Olson, J.M., & Kibbler, A. (1983). Electrochemical Nucleation and Growth of Silicon in Molten Fluorides. J. Electrocheml. Soc., 130(4), 782-786 DOI: 10.1149/1.2119803.[Crossref]
  • Wang, L., Tomura, S., Ohashi, S.M.F., Inukai, K. & Maeda M. (2001). Synthesis of mesoporous silica material with sodium hexafluorosilicate as silicon source under ultra-low surfactant concentration. J. Mater. Sci. Lett. 20, 277-280. DOI: 10.1023/A:1006761926695.[Crossref]
  • Leal-Cruz, A.L. & Pech-Canul, M.I. (2006). In situ synthesis of Si3N4 from Na2SiF6 as a silicon solid precursor. Mater. Chem. Phys. 98(1), 27-33. DOI: 10.1016/j.matchemphys.2005.08.057.[Crossref]
  • Frayret, J., Castetbon, A., Trouve, G. & Potin-Gautier, M. (2006). Solubility of (NH4)2SiF6, K2SiF6 and Na2SiF6 in acidic solutions. Chem. Phys. Lett. 427, 356-364. DOI:10.1016/j.cplett.2006.06.044.[Crossref]
  • JPMC (2009). 56th Annual Report & Financial Statments for the year 2009. Amman/Jordan: Jordan Phosphate Mines Co. PLC. 1-43.
  • Ghuge, K.D. & R.R. Angadi (1987). Indian Journal of Technolology, 25, 187.
  • Pozin, M.E. (1989). Mineral Fertilizers Technology (in Russian). Leningrad: Khimia.
  • Sikdar, S.K. & Moore, J.H. (1980). Recovery of hydrofluoric acid from fluosilicic acid with high pH hydrolysis. Patent No. 4,213,951 USA.
  • Lide, D.R. (2010). ed. ^eds. CRC Handbook of Chemistry and Physics. 90th Edition ed. CRC.
  • Schroder, F. (1992). in Gmelin Handbook of inorganic and Organometallic Chemistry: Si, Suppl. Springer-Verlag: Berlin. 300.
  • Park, H.C., Ryu, B.K., Park, S.S., Shin, H.G., Lee, S.H. & You, Y.W. (1997). Recycling of waste HF solution by Na2CO3 treatment for use in cleaning of TV panel glass. J. Mater. Sci. Lett. 17(1), 11-13. DOI: 10.1023/A:1006525204074.[Crossref]
  • Ruixiang, Z. (2005). Process optimization in batch crystallization of sodium fluosilicate. Cryst. Res. Technol. 40(3), 243-247. DOI: 10.1002/crat.200410332.[Crossref]
  • Bulko, J.B. & Smyser, B.M. (2000). Method for producing silicon tetraflouride from uranium oxyflouride. Patent No. WO 00/58212.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_v10026-011-0019-4
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