Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers
Ash and slag waste (ASW) from coal combustion creates significant environmental and economic challenges. A promising method of ASW recycling is alkali activation with geopolymer material formation. This study investigates the influence of activating solution components (sodium hydroxide and sodium s...
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MDPI AG
2023-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/22/7535 |
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| author | Elena A. Yatsenko Boris M. Goltsman Andrey I. Izvarin Viktor M. Kurdashov Victoria A. Smoliy Anna V. Ryabova Lyudmila V. Klimova |
| author_facet | Elena A. Yatsenko Boris M. Goltsman Andrey I. Izvarin Viktor M. Kurdashov Victoria A. Smoliy Anna V. Ryabova Lyudmila V. Klimova |
| author_sort | Elena A. Yatsenko |
| collection | DOAJ |
| description | Ash and slag waste (ASW) from coal combustion creates significant environmental and economic challenges. A promising method of ASW recycling is alkali activation with geopolymer material formation. This study investigates the influence of activating solution components (sodium hydroxide and sodium silicate) on the formation of porous geopolymers using ASW of different origins. The sodium hydroxide content of 0–4 wt.% and the sodium silicate content of 17–25 wt.% were studied. An increase in sodium hydroxide resulted in decreased density, but it adversely affected the strength. An increase in sodium silicate led to a compromised porous structure with relatively high density and compressive strength. An optimal composition, S19N3, comprising 3 wt.% of sodium hydroxide and 19 wt.% of sodium silicate obtained porous geopolymers with uniformly distributed 1.4–2 mm pores and a corresponding density of 335 kg/m<sup>3</sup>, a compressive strength of 0.55 MPa, a porosity value of 85.6%, and a thermal conductivity value of 0.075 W/(m·K). A mechanism for porous geopolymer formation was developed, including the interaction of alkaline components with ASW and a foaming agent, foaming, curing, and densification. The mechanism was examined using ASW from the Severodvinsk CHPP-1. This study allows for the optimization of geopolymer mixtures with various waste sources and the utilization of waste materials in the construction industry. |
| first_indexed | 2024-03-09T16:51:46Z |
| format | Article |
| id | doaj.art-7110bfb2c5d34c878b2b8ff0a7fd2e2e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T16:51:46Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7110bfb2c5d34c878b2b8ff0a7fd2e2e2023-11-24T14:40:10ZengMDPI AGEnergies1996-10732023-11-011622753510.3390/en16227535Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed GeopolymersElena A. Yatsenko0Boris M. Goltsman1Andrey I. Izvarin2Viktor M. Kurdashov3Victoria A. Smoliy4Anna V. Ryabova5Lyudmila V. Klimova6Department “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaDepartment “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaDepartment “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaDepartment “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaDepartment “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaDepartment “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaDepartment “General Chemistry and Technology Silicates”, Platov South-Russian State Polytechnic University (NPI), Prosveshcheniya Street 132, Rostov Region, 346428 Novocherkassk, RussiaAsh and slag waste (ASW) from coal combustion creates significant environmental and economic challenges. A promising method of ASW recycling is alkali activation with geopolymer material formation. This study investigates the influence of activating solution components (sodium hydroxide and sodium silicate) on the formation of porous geopolymers using ASW of different origins. The sodium hydroxide content of 0–4 wt.% and the sodium silicate content of 17–25 wt.% were studied. An increase in sodium hydroxide resulted in decreased density, but it adversely affected the strength. An increase in sodium silicate led to a compromised porous structure with relatively high density and compressive strength. An optimal composition, S19N3, comprising 3 wt.% of sodium hydroxide and 19 wt.% of sodium silicate obtained porous geopolymers with uniformly distributed 1.4–2 mm pores and a corresponding density of 335 kg/m<sup>3</sup>, a compressive strength of 0.55 MPa, a porosity value of 85.6%, and a thermal conductivity value of 0.075 W/(m·K). A mechanism for porous geopolymer formation was developed, including the interaction of alkaline components with ASW and a foaming agent, foaming, curing, and densification. The mechanism was examined using ASW from the Severodvinsk CHPP-1. This study allows for the optimization of geopolymer mixtures with various waste sources and the utilization of waste materials in the construction industry.https://www.mdpi.com/1996-1073/16/22/7535geopolymer materialsash and slag wastealkaline activatorporous structure formation |
| spellingShingle | Elena A. Yatsenko Boris M. Goltsman Andrey I. Izvarin Viktor M. Kurdashov Victoria A. Smoliy Anna V. Ryabova Lyudmila V. Klimova Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers Energies geopolymer materials ash and slag waste alkaline activator porous structure formation |
| title | Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers |
| title_full | Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers |
| title_fullStr | Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers |
| title_full_unstemmed | Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers |
| title_short | Recycling Ash and Slag Waste from Thermal Power Plants to Produce Foamed Geopolymers |
| title_sort | recycling ash and slag waste from thermal power plants to produce foamed geopolymers |
| topic | geopolymer materials ash and slag waste alkaline activator porous structure formation |
| url | https://www.mdpi.com/1996-1073/16/22/7535 |
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