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Calcination parameters on phosphogypsum waste recycling
https://orcid.org/0000-0002-4549-8848
https://orcid.org/0000-0003-4536-9699
Highlights Phosphogypsum (PG) was used to obtain β-hemihydrate. PG calcination conditions affect the β-hemihydrate content. β-Hemihydrate with low energy consumption can be obtained. Calcined PG as binder can be an eco-friendly material.
Abstract The calcination at low temperatures transforms phosphogypsum (PG) waste in a material with binder properties. This study evaluated two parameters of PG calcination: kiln residence time (1 h, 2 h, and 5 h) and temperature (120 °C, 150 °C, and 200 °C). The main objective was to find adequate calcination conditions considering PG transformation into β-hemihydrate gypsum, with minimum energy spent. Physical properties, thermal analysis, chemical and mineralogical compositions, and microstructure were analysed. The increase in residence time and temperature showed to result in higher β-hemihydrate content; however, there is an increase in energy spent. A temperature of 150 °C with residence times on the kiln of 1 h and 2 h were found as adequate parameters to obtain considerable β-hemihydrate content with lower energy consumption.
Calcination parameters on phosphogypsum waste recycling
https://orcid.org/0000-0002-4549-8848
https://orcid.org/0000-0003-4536-9699
Highlights Phosphogypsum (PG) was used to obtain β-hemihydrate. PG calcination conditions affect the β-hemihydrate content. β-Hemihydrate with low energy consumption can be obtained. Calcined PG as binder can be an eco-friendly material.
Abstract The calcination at low temperatures transforms phosphogypsum (PG) waste in a material with binder properties. This study evaluated two parameters of PG calcination: kiln residence time (1 h, 2 h, and 5 h) and temperature (120 °C, 150 °C, and 200 °C). The main objective was to find adequate calcination conditions considering PG transformation into β-hemihydrate gypsum, with minimum energy spent. Physical properties, thermal analysis, chemical and mineralogical compositions, and microstructure were analysed. The increase in residence time and temperature showed to result in higher β-hemihydrate content; however, there is an increase in energy spent. A temperature of 150 °C with residence times on the kiln of 1 h and 2 h were found as adequate parameters to obtain considerable β-hemihydrate content with lower energy consumption.
Calcination parameters on phosphogypsum waste recycling
https://orcid.org/0000-0002-4549-8848
https://orcid.org/0000-0003-4536-9699
Highlights Phosphogypsum (PG) was used to obtain β-hemihydrate. PG calcination conditions affect the β-hemihydrate content. β-Hemihydrate with low energy consumption can be obtained. Calcined PG as binder can be an eco-friendly material.
Abstract The calcination at low temperatures transforms phosphogypsum (PG) waste in a material with binder properties. This study evaluated two parameters of PG calcination: kiln residence time (1 h, 2 h, and 5 h) and temperature (120 °C, 150 °C, and 200 °C). The main objective was to find adequate calcination conditions considering PG transformation into β-hemihydrate gypsum, with minimum energy spent. Physical properties, thermal analysis, chemical and mineralogical compositions, and microstructure were analysed. The increase in residence time and temperature showed to result in higher β-hemihydrate content; however, there is an increase in energy spent. A temperature of 150 °C with residence times on the kiln of 1 h and 2 h were found as adequate parameters to obtain considerable β-hemihydrate content with lower energy consumption.
Calcination parameters on phosphogypsum waste recycling
Geraldo, Rodrigo H. (author) / Costa, Ana Rita D. (author) / Kanai, Julia (author) / Silva, Jefferson S. (author) / Souza, Janaína D. (author) / Andrade, Heloysa M.C. (author) / Gonçalves, Jardel P. (author) / Fontanini, Patricia S.P. (author) / Camarini, Gladis (author)
2020-04-29
Article (Journal)
Electronic Resource
English
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