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Manufacturing carbon storage sintered body using microwave-selective and high-speed heating techniques
K Kashimura1, A Oshita2, T Miyata2
1Faculty of Engineering, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi, 487-8501, Japan. kashimura@isc.chubu.ac.jp.
Scientific Reports
|March 29, 2023
Summary
Microwave sintering effectively sinters calcium carbonate (CaCO3) in fly ash by leveraging selective heating of carbides and controlled water addition. This method prevents CaCO3 decomposition, enabling efficient CO2 fixation during the sintering process.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Fly ash utilization is crucial for sustainable waste management.
- Calcium carbonate (CaCO3) can be used to fix CO2, but its sintering is challenging with conventional methods.
- Unburned carbon in fly ash can interfere with sintering processes.
Purpose of the Study:
- To investigate microwave sintering of fly ash with high unburned carbon and CaCO3 content.
- To explore methods for preventing CaCO3 decomposition during microwave sintering.
- To achieve efficient CO2 fixation within a sintered fly ash matrix.
Main Methods:
- Microwave irradiation was used to sinter fly ash mixed with CaCO3.
- Experiments were conducted at 1000°C with and without added water.
- Selective heating of carbides by controlling microwave irradiation was employed.
- Gas-phase water storage was utilized before spreading the material.
Main Results:
- CaCO3 decomposed at 1000°C without water, but aragonite was obtained with added water.
- Microwave irradiation created localized temperature gradients, suppressing CaCO3 decomposition.
- Selective heating of carbides allowed for controlled sintering.
- CaCO3 was successfully sintered without decomposition using the developed method.
Conclusions:
- Microwave sintering offers a viable route for consolidating fly ash with CaCO3.
- Controlled addition of water and selective microwave heating are key to preventing CaCO3 decomposition.
- This technique enhances the potential for CO2 sequestration in sintered fly ash materials.
