We propose a new cement recycling process via carbonic acid treatment. The dependencies of the extraction reaction rate on the ratio of waste cement to water, CO2 pressure, and the particle size of the raw waste cement particles were investigated experimentally with a laboratory-scale setup. Calcium carbonate with about 97 % purity was obtained in the precipitation process. A process simulation was conducted based on the experimental results, and energy consumption and the cost for a model process were estimated. The cost for the production of 1 metric-ton of CaCO3 for desulfurization of the 500 MW thermal power plant is estimated to be about 120 USD.
|Number of pages||8|
|Publication status||Published - 2004|
|Event||2004 AIChE Annual Meeting - Austin, TX, United States|
Duration: 2004 Nov 7 → 2004 Nov 12
|Conference||2004 AIChE Annual Meeting|
|Period||04/11/7 → 04/11/12|