Ammonium Carbonate And Calcium Chloride

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Materials Chemistry and Physics

Highlights

•: Calcium carbonate was precipitated from calcium chloride solution via carbonation.
•: The characteristics of CaCO_iii depended on used CO₂ absorption promoters.
•: Fast CO₂ absorption in NH₃ or MEA solutions favored vaterite germination.
•: Slower carbonation in the presence of TEtA or TEA resulted in calcite atmospheric precipitation.

Abstract

The atmospheric precipitation of calcium carbonate was carried out by passing a gaseous mixture of carbon dioxide and air into a calcium chloride solution. The selected compounds enhancing carbon dioxide absorption were used equally additives which promote the formation of carbonate ions in the solution. The additives were ammonia, monoethanolamine, triethylamine and triethanolamine. The resulting calcium carbonate particles varied in polymorphic limerick and the particle size depending on the used assimilation promoter. When assimilation occurred speedily in ammonia or monoethanolamine solutions, the obtained calcium carbonate particles were mainly vaterite. Calcium carbonate particles were precipitated equally calcite in triethylamine or triethanolamine solutions, while the charge per unit of carbon dioxide mass transfer from gas to liquid phase was much slower. All precipitated calcium carbonate particles had monomodal particle size distributions. Smaller particles of vaterite were produced in the monoethanolamine solution and of calcite in the triethylamine solution.

Keywords

Calcium carbonate

Carbon dioxide

Atmospheric precipitation

Carbonation

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