Étude de l’effet d’un polyacrylate et d’un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

Ahmed, Samia ben; Tlili, Mohamed; Amor, Mohamed Ben; Joiret, S.

doi:10.1051/jp4:2004122022

Cited by 2 publications

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References 6 publications

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“…In the second case, it was shown by Raman analysis that RPI affected the precipitated phase. It inhibits gypsum nucleation in favour of bassanite then anhydrite by increasing RPI quantity [21].…”

Section: Introductionmentioning

confidence: 99%

Influence of a polyacrylate antiscalant on gypsum nucleation and growth

Ahmed

Tlili²,

Amor

2008

Cryst. Res. Technol.

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Calcium sulphate dihydrate (gypsum) crystallization was studied under conditions, of supersaturation and temperature, simulating a brackish water desalination unit using solar energy. The effect of an commercial sodium salt of poly(acrylic acid), based compound known as RPI, on homogeneous nucleation and growth of gypsum was also examined. Gypsum was precipitated by mixing aqueous CaCl 2 and Na 2 SO 4 solutions. It was found that, with increasing temperature or supersaturation, the induction time decreases and the growth rate increases. By using classical nucleation theory, the interfacial tension and the nucleation rate values were estimated. It was shown that the interfacial tension is temperature dependent. The addition of increasing quantities of RPI, in the same conditions of temperature and supersaturation, prolongs the induction time, decreases the nucleation rate and increases the interfacial tension. The addition mode of RPI (in calcium or in sulphate solution) was found as an important parameter in controlling the inhibition process of gypsum crystallization. XRD and SEM analysis showed that RPI antiscalant strongly affected the texture and the morphology of the deposit gypsum.

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Section: Introductionmentioning

confidence: 99%