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Precipitation of Calcium Carbonate with Different Morphologies in the Resourcization of Distiller Waste

Yunzhao Li ,  Xingfu Song ,  Jianguo Yu 

East China University of Science and Technology, Shanghai 200237, China

Abstract

    Combined with circular economy and comprehensive utilization, a new method was put forward in this paper for the treatment of distiller waste produced in soda industry. Calcium chloride was changed into precipitated calcium carbonate through a reaction-extraction-crystallization process. The reaction equation was as follows:

 CaCl2 + CO2 + H2O + 2S → CaCO3↓+ 2S·HCl

      The effects of the concentration of extractant, phase ratio, the initial concentration of calcium chloride, partial pressure of carbon dioxide, stirring rate, reaction temperature and time on the conversion rate of calcium chloride and the size distribution and morphology of calcium carbonate were investigated with regard to the gas-liquid-liquid-solid system. The optimal operating variables were found and results showed that calcium carbonate particles with different morphologies could be prepared in the presence of different additives. The solid products were characterized with scanning electron microscopy, partial size analyzer and X-ray diffraction. The mass transfer mechanism was demonstrated simultaneously.
 

Auxiliary resources (full texts, presentations, posters, etc.)
  1. PRESENTATION: Precipitation of Calcium Carbonate with Different Morphologies in the Resourcization of Distiller Waste, Microsoft Office Document, 0MB
 

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Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, General Session 4, by Yunzhao Li
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-03-29 03:04
Revised:   2013-03-29 03:17