A novel recycling process of waste cement

Akihiro Yamasaki, Atsushi Iizuka, Yasuro Katsuyama, Minoru Fujii, Yukio Yanagisawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A recycling process of waste cement by carbonation reaction with pressurized CO2 is discussed. It is found that the proposed process consists of two main reactions. The first is the extraction of calcium ions from waste cement particles in water slurry by pressurized carbon dioxide. The second is the precipitation of calcium carbonate (CaCO3) by reducing the pressure of CO2. The product, CaCO3 can be recycled as a raw material for cement production. The results show that the extraction process can be proceeded with relatively high rates in the initial 10 minutes of the reaction time, where the concentration of calcium ions exceeded thermodynamic solubility.

Original languageEnglish
Title of host publication2004 AIChE Spring National Meeting, Conference Proceedings
Pages2440-2448
Number of pages9
Publication statusPublished - 2004 Aug 30
Externally publishedYes
Event2004 AIChE Spring National Meeting, Conference Proceedings - New Orleans, LA, United States
Duration: 2004 Apr 252004 Apr 29

Publication series

Name2004 AIChE Spring National Meeting, Conference Proceedings

Other

Other2004 AIChE Spring National Meeting, Conference Proceedings
CountryUnited States
CityNew Orleans, LA
Period04/4/2504/4/29

ASJC Scopus subject areas

  • Engineering(all)
  • Energy(all)

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