Title:
Enhancing Reactivity of Calcined Clays for Sustainable Cement Production through Optimization of Rotary Kiln Parameters
Author(s):
Abdelmoujib Bahhou, Yassine Taha, Yasmine Rhaouti, Mohamed El Amal, Rachid Hakkou, Mostafa Benzaazoua, and Arezki Tagnit-Hamou
Publication:
Symposium Paper
Volume:
362
Issue:
Appears on pages(s):
738-762
Keywords:
reactivity; clay; thermal treatment; rotary kiln; life cycle assessment; strength activity index
DOI:
10.14359/51742006
Date:
6/17/2024
Abstract:
The use of calcined clays as a substitute for traditional cement materials has the potential to significantly reduce the carbon emissions of the cement industry. However, for their widespread adoption and urgent need to feed the cement industry, it is essential to have a comprehensive understanding of the methods involved in processing these clays to ensure maximum reactivity. Thermal treatment of these clays induces chemical reactions that transform the combined materials into reactive pozzolan by eliminating hydroxyl groups from the clay structure, resulting in the activation of alumina and silica oxides. A commonly employed industrial method for activating these clays is through the use of a rotary kiln. With an optimal temperature profile and material retention time, rotary kilns play a crucial role in ensuring the production of high-quality calcined clays. This study aims to enhance control performance and achieve a highly reactive marl by optimizing the preparation process through three steps: (1) characterizing the raw materials, (2) optimizing the kiln parameters, and (3) conducting the life cycle assessment of the process. The reactivity of the calcined marl will be evaluated using the ASTM C1897 Standard Test Methods and the strength activity index.
Related References:
1. IEA, “Direct CO2 Intensity of Cement in the Sustainable Development Scenario 2014–2030. IEA, Paris,” 2019.
2. W. B. Ellis, “Books: Ullmann’s Encyclopedia of Industrial Chemistry.” Wiley Online Library, 1999.
3. G. Moumin et al., “CO2 emission reduction in the cement industry by using a solar calciner,” Renew. Energy, vol. 145, pp. 1578–1596, 2020.
4. M. Tomatis, H. K. Jeswani, L. Stamford, and A. Azapagic, “Assessing the environmental sustainability of an emerging energy technology: Solar thermal calcination for cement production,” Sci. Total Environ., vol. 742, p. 140510, 2020.
5. A. Meier, N. Gremaud, and A. Steinfeld, “Economic evaluation of the industrial solar production of lime,” Energy Convers. Manag., vol. 46, no. 6, pp. 905–926, 2005.
6. R. L. Frost and A. M. Vassallo, “The dehydroxylation of the kaolinite clay minerals using infrared emission spectroscopy,” Clays Clay Miner., vol. 44, pp. 635–651, 1996.
7. R. Fernandez, F. Martirena, and K. L. Scrivener, “The origin of the pozzolanic activity of calcined clay minerals: A comparison between kaolinite, illite and montmorillonite,” Cem. Concr. Res., vol. 41, no. 1, pp. 113–122, 2011.
8. E. Gasparini et al., “Thermal dehydroxylation of kaolinite under isothermal conditions,” Appl. Clay Sci., vol. 80, pp. 417–425, 2013.
9. A. Alujas, R. Fernández, R. Quintana, K. L. Scrivener, and F. Martirena, “Pozzolanic reactivity of low grade kaolinitic clays: Influence of calcination temperature and impact of calcination products on OPC hydration,” Appl. Clay Sci., vol. 108, pp. 94–101, 2015.
10. A. Bahhou et al., “Use of phosphate mine by-products as supplementary cementitious materials,” Mater. Today Proc., vol. 37, pp. 3781–3788, 2020.
11. A. el Mahdi Safhi, Y. Taha, M. El Ghorfi, R. Hakkou, and M. Benzaazoua, “Elaboration of a blended binder based on marls from phosphate mines waste rocks,” Constr. Build. Mater., vol. 347, p. 128539, 2022.
12. A. Bahhou, Y. Taha, Y. El Khessaimi, R. Hakkou, A. Tagnit-Hamou, and M. Benzaazoua, “Using Calcined Marls as Non-Common Supplementary Cementitious Materials—A Critical Review,” Miner. 2021, Vol. 11, Page 517, vol. 11, no. 5, p. 517, May 2021.
13. S. Zhang, K. Wang, X. Zhang, and Y. Jiang, “Preparing new supplementary cementitious materials with co-calcined waste glass-dolomite and environmental assessment,” Constr. Build. Mater., vol. 389, no. October 2022, p. 131770, 2023.
14. T. Hanein et al., “Clay calcination technology: state-of-the-art review by the RILEM TC 282-CCL,” Mater. Struct. Constr., vol. 55, no. 1, 2022.
15. ASTM, “C 1897-20 Standard Test Methods for Measuring the Reactivity of Supplementary Cementitious Materials by Isothermal Calorimetry and Bound Water Measurements,” vol. 04, pp. 7–11, 2021.
16. N. E. 196-1, “Méthodes d’essais des ciments,” 2016.
17. S. L. C. Ferreira, W. N. L. Dos Santos, C. M. Quintella, B. B. Neto, and J. M. Bosque-Sendra, “Doehlert matrix: A chemometric tool for analytical chemistry - Review,” Talanta, vol. 63, no. 4, pp. 1061–1067, 2004.
18. I. 14040:2006, Environmental management — Life cycle assessment —— Principles and framework. 2006.
19. “ecoinvent Version 3.8.,” 2024. Online.. Available: https://support.ecoinvent.org/ecoinventversion-3.8.
20. C. Bulle, “IMPACT World+: a globally regionalized life cycle impact assessment method. The International Journal of Life Cycle Assessment,” no. 24, pp. 1653–1674, 2019.
21. D. M. Worrall, Clays and ceramic raw materials. Springer Science & Business Media, 1986.
22. J. Madejová, “FTIR techniques in clay mineral studies,” Vib. Spectrosc., vol. 31, no. 1, pp. 1–10, 2003.
23. M. Maier, N. Beuntner, and K. C. Thienel, “Mineralogical characterization and reactivity test of common clays suitable as supplementary cementitious material,” Appl. Clay Sci., vol. 202, no. January, p. 105990, 2021.
24. D. Londono-Zuluaga et al., “Report of RILEM TC 267-TRM phase 3: validation of the R3 reactivity test across a wide range of materials,” Mater. Struct. Constr., vol. 55, no. 5, 2022.
25. M. J. Mccarthy and T. D. Dyer, Pozzolanas and Pozzolanic Materials, 5th ed. Elsevier Ltd., 2019.
26. G. Marchetti, V. Rahhal, Z. Pavlík, M. Pavlíková, and E. F. Irassar, “Assessment of packing, flowability, hydration kinetics, and strength of blended cements with illitic calcined shale,” Constr. Build. Mater., vol. 254, p. 119042, 2020.
27. C. Bich, J. Ambroise, and J. Péra, “Influence of degree of dehydroxylation on the pozzolanic activity of metakaolin,” Appl. Clay Sci., vol. 44, no. 3–4, pp. 194–200, 2009.