Effects of Aging Time on The Formation of Calcium Carbonate Polymorphs

Abstract

In this work, effects of aging time, initial reactant concentration, reactant feeding rate and a polymeric

additive on calcium carbonate crystallization were investigated by wet precipitation. The precipitated phase

was aged at specified times. Then the obtained crystal forms were characterized by Fourier Transform Infrared

Spectroscopy (FT-IR) and X-Ray Powder Diffraction (XRD) methods. Results showed that the polymorph of the

calcium carbonate crystals was affected by aging time and additive used.

Keywords

• Calcium carbonate,calcit,crystallization,polymorph,vaterite

Kalsiyum Karbonat Polimorflarının Oluşumuna Yaşlandırma Süresinin Etkisi

Abstract

Bu çalışmada, yaşlandırma süresinin, başlangıç reaktan konsantrasyonunun, reaktan besleme hızının

ve katkı maddesinin kalsiyum karbonat kristalizasyonuna etkisi ıslak çöktürme yöntemi ile incelenmiştir.

Kristalizasyon deneylerinde çöken faza belirlenen sürelerde yaşlandırma işlemi uygulanmış ve elde edilen kristaller

Fourier Dönüşümlü Kızılötesi Spektroskopi (FT-IR) ve X-Işınları Toz Difraksiyon (XRD) metotları ile karakterize

edilmiştir. CaCO3 kristallerinin polimorflarının oluşumunda yaşlandırma süresinin ve kullanılan polimerik katkı

maddesinin etkili olduğu görülmüştür.

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