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Effect of ions on particle size and morphology in calcium carbonate((CaCO3) crystallization için kapak resmi
Effect of ions on particle size and morphology in calcium carbonate((CaCO3) crystallization
Osman Adam Osman, Ahmed, author.
Fiziksel Tanımlama:
xiii, 90 leaves: charts;+ 1 computer laser optical disc.
The particle sizes of calcium carbonate (CaCO3) produced by the chemical crystallization method were reported to be almost always larger than 3 µm. An experimental setup was developed to crystalize CaCO3 from sodium carbonate (Na2CO3) and calcium chloride (CaCl2) solutions in a plug flow reactor (PFR) with a retention time of 9 seconds and added into a stabilizing solution of calcium hydroxide. The CaCO3 particles were produced with a size larger than 13 µm in the PFR tubular reactor. Effect of cations such as hydroxide form of sodium (Na+), potassium (K+), calcium (Ca++), and barium (Ba++) as well as anions such as the sodium form sulfate (SO4=), nitrate (NO3-), carbonate (CO3=) and bisphosphate (HPO4=) were investigated. While cations produced calcite particles at sizes larger than 2 μm in the presence of Na+and K+ ions, nano-calcite particles in the presence of Ca++ ions. A new crystalline form, Barytocalcite (BaCa(CO3)2), and whitherite (BaCO3) particles were produced in solution containing Ba++ ions. The size and morphology of vaterite and calcite particles did not change as particles in the PFR tubular reactor in the presence of SO4=, NO3-, and CO3=ions. Different crystal forms were synthesized in the presence of HPO4=ion. These formations clearly indicated the dissolution and recrystallization of CaCO3 particles. A novel technique was devised for the continuous production of nano-CaCO3. It was demonstrated that nano-calcite particles of about 350 nm were produced by the chemical method not previously reported in the literature.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Master)--İzmir Institute of Technology:Chemical Engineering.

İzmir Institute of Technology: Chemical Engineering --Thesis (Master).
Elektronik Erişim:
Access to Electronic Versiyon.


Materyal Türü
Demirbaş Numarası
Yer Numarası
Durumu/İade Tarihi
Tez T002451 TP156.C7 O83 2021

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