scholarly journals Plasma Dissociated Zircon (PDZ) Processing; Influence of the Zr:Si Ratio in the Composition, Microstructure and Thermal Re-Crystallization

2012 ◽  
Vol 1 ◽  
pp. 337-342 ◽  
Author(s):  
N.M. Rendtorff ◽  
G. Suárez ◽  
M.S. Conconi ◽  
S.K. Singh ◽  
E.F. Aglietti
Keyword(s):  
Dissociated Zircon

The effect of milling and percentage dissociation of plasma dissociated zircon on the colour of Pr-yellow and V-blue zircon pigments

2006 ◽  
Vol 26 (9) ◽  
pp. 1599-1603 ◽  
Author(s):  
E. Snyders ◽  
J.H. Potgieter ◽  
J.T. Nel
Keyword(s):  
Dissociated Zircon

Zircon-Zirconia Ceramics Prepared from Plasma Dissociated Zircon

1982 ◽  
Vol 65 (4) ◽  
pp. c57-c58 ◽  
Author(s):  
R. Mcpherson ◽  
B. V. Shafer ◽  
Ai Ming Wong
Keyword(s):  
Zirconia Ceramics ◽  
Dissociated Zircon

Optimisation of performance of dispersants in aqueous plasma dissociated zircon suspension

2002 ◽  
Vol 28 (4) ◽  
pp. 413-417 ◽  
Author(s):  
Bimal P. Singh ◽  
Sarama Bhattacharjee ◽  
Laxmidhar Besra
Keyword(s):  
Dissociated Zircon ◽  
Zircon Suspension

scholarly journals PHASE FORMATION PROCESSES AT LOW-TEMPERATURE FLUORINATION OF ZIRCONIUM SILICATE

2021 ◽  
Vol 64 (4) ◽  
pp. 67-72
Author(s):  
Sharif M. Sharafeev ◽  
Vladimir I. Vereshchagin
Keyword(s):  
Low Temperature ◽  
Solid Phase ◽  
Thermal Dissociation ◽  
Actual Problem ◽  
Zirconium Fluoride ◽  
Ammonium Hexafluorosilicate ◽  
Zirconium Silicate ◽  
Natural Zircon ◽  
Composition Of Minerals ◽  
Dissociated Zircon

Zirconium silicate ceramics is widely used in different fields of engineering. One of the most actual problem of zircon ceramics is the requiring of high temperatures for its sintering. Perspective method for activation of silicate materials with the aim of intensification of synthesis and sintering processes is the low-temperature fluoridation with the ammonium hydrofluoride. In accordance with that, processes occurring during the interaction of plasma dissociated zircon and natural zircon with ammonium hydrodifluoride were studied. It was established that plasma dissociated zircon actively interacts with ammonium hydrofluoride in the solid phase. Natural zircon because of its chemical inertness reacts with ammonium hydrofluoride only when latter melts. The main product of fluorinating is ammonium hexafluorosilicate. By-products are ammonium hexafluorozirconate and ammonium heptafluorozirconate. Their quantity increases with the content of ammonium hydrofluoride in mixtures. Kinetic equation of reaction between zircon and ammonium hydrofluoride is k×τ = 1-(1-α)1/n. Activation energy of plasma dissociated zircon and natural zircon fluorinating reactions are 13.9 and 32.7 kJ/mol, respectively. Order of reactions (n) are 2.0 and 1.5, respectively. Thermal treatment of fluorinated materials at 400 °C leads to ammonium hexafluorosilicate sublimation and thermal dissociation of ammonium fluorozirconates to zirconium fluoride and fluorozirconate intermediates. It was established that low-temperature fluoridation of zircon makes possible to regulate chemical composition of minerals. Materials obtained by ammonium hydrofluoride treatment of plasma dissociated and natural zircon can be potentialy used in the functional zircon and zirconia-zircon ceramics technology.

scholarly journals Effect of the value of x in NH4F·xHF on the digestion of plasma-dissociated zircon

2016 ◽  
Vol 147 ◽  
pp. 43-47 ◽  
Author(s):  
W. du Plessis ◽  
A.D. Pienaar ◽  
C.J. Postma ◽  
P.L. Crouse
Keyword(s):  
Dissociated Zircon

Microstructure of plasma dissociated zircon and liquid immiscibility in the ZrO2-SiO2 system

1980 ◽  
Vol 15 (9) ◽  
pp. 2325-2330 ◽  
Author(s):  
A. M. Evans ◽  
J. P. H. Williamson ◽  
F. P. Glasser
Keyword(s):  
Liquid Immiscibility ◽  
Sio2 System ◽  
Dissociated Zircon

Improved thermal shock resistant refractories from plasma-dissociated zircon

1979 ◽  
Vol 14 (4) ◽  
pp. 817-822 ◽  
Author(s):  
R. C. Garvie
Keyword(s):  
Thermal Shock ◽  
Dissociated Zircon

The reassociation of plasma dissociated zircon

1985 ◽  
Vol 20 (7) ◽  
pp. 2597-2602 ◽  
Author(s):  
R. McPherson ◽  
R. Rao ◽  
B. V. Shafer
Keyword(s):  
Dissociated Zircon

The determination of percentage dissociation of zircon (ZrSiO4 ) to plasma-dissociated zircon (ZrO2 . SiO2 ) by Raman spectroscopy

2011 ◽  
Vol 43 (6) ◽  
pp. 769-773 ◽  
Author(s):  
L. D. Kock ◽  
M. D. S. Lekgoathi ◽  
E. Snyders ◽  
J. B. Wagener ◽  
J. T. Nel ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Dissociated Zircon

The structure of plasma dissociated zircon

1981 ◽  
Vol 16 (6) ◽  
pp. 1732-1735 ◽  
Author(s):  
Ai Ming Wong ◽  
R. McPherson
Keyword(s):  
Dissociated Zircon
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