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Pyro processing cement kiln bypass dust: Enhancing clinker phase formation
Highlights Cement clinker phases are produced through the pyro processing of cement kiln bypass dust. Clinker phase formation is enhanced by the intrinsic constituents within CBPD. Alite is formed at 1200 °C which is much lower than conventional. The chloride salt is removed from the clinker through heating.
Abstract The valorisation of cement kiln bypass dust (CBPD) is explored for sustainable production of cementitious clinker phases. CBPD can replace the calcareous component in cement manufacture and allow for a reduction in CO2 emissions, as the calcium component in CBPD is mostly decarbonised. CBPD was heated with/out the addition of alumina or silica at temperatures of 900 – 1100 °C to produce clinker phases. Belite and mayenite formed at temperatures as low as 900 °C, while alite formation was achieved at 1200 °C, which is significantly lower than is conventional (~1450 °C). Alite is thermodynamically stable only above 1250 °C; thus, the reduced temperature is potentially owing to the presence of chloride found in the CBPD (as KCl) which was also simultaneously removed through pyro processing at 1100 – 1200 °C. The investigation also confirmed that the formation of belite is enhanced in the presence of molten KCl.
Pyro processing cement kiln bypass dust: Enhancing clinker phase formation
Highlights Cement clinker phases are produced through the pyro processing of cement kiln bypass dust. Clinker phase formation is enhanced by the intrinsic constituents within CBPD. Alite is formed at 1200 °C which is much lower than conventional. The chloride salt is removed from the clinker through heating.
Abstract The valorisation of cement kiln bypass dust (CBPD) is explored for sustainable production of cementitious clinker phases. CBPD can replace the calcareous component in cement manufacture and allow for a reduction in CO2 emissions, as the calcium component in CBPD is mostly decarbonised. CBPD was heated with/out the addition of alumina or silica at temperatures of 900 – 1100 °C to produce clinker phases. Belite and mayenite formed at temperatures as low as 900 °C, while alite formation was achieved at 1200 °C, which is significantly lower than is conventional (~1450 °C). Alite is thermodynamically stable only above 1250 °C; thus, the reduced temperature is potentially owing to the presence of chloride found in the CBPD (as KCl) which was also simultaneously removed through pyro processing at 1100 – 1200 °C. The investigation also confirmed that the formation of belite is enhanced in the presence of molten KCl.
Pyro processing cement kiln bypass dust: Enhancing clinker phase formation
Hanein, Theodore (author) / Hayashi, Yuki (author) / Utton, Claire (author) / Nyberg, Magnus (author) / Martinez, Juan-Carlos (author) / Quintero-Mora, Nestor-Isaias (author) / Kinoshita, Hajime (author)
2020-07-28
Article (Journal)
Electronic Resource
English
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