Experimental and modeling study of flash calcination of kaolinite rich clay particles in a gas suspension calciner
Source abstract
Abstract
Calcination of kaolinite particles under appropriate conditions to produce materials that can replace part of the CO2 intensive clinker is gaining an increasing interest in cement industry worldwide. This paper presents a study of flash calcination of kaolinite rich clay particles in a pilot scale gas suspension calciner, with the aim to derive useful guidelines on smart calcination for obtaining products of the best pozzolanic properties. Calcination tests are performed in the calciner under six different operation conditions. The raw feed and the calcined clay samples are all characterized experimentally and a mathematical model is also developed to predict the conversion of the clay particles. The model properly accounts for the particle–ambient flow interaction and numerically solves all the processes occurring within the clay particles. The model predictions are compared against the experimental results. A good agreement is achieved. Finally, a model-based sensitivity analysis is conducted.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · CO2 Sequestration and Geologic Interactions · Zeolite Catalysis and Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. Gas temperature and radiative heat transfer in oxy-fuel flames
2. Bapat · 2012 · 91
3. Quantitative mineralogical analysis using the Rietveld full-pattern fitting method
4. Bolz · 1976
5. Properties of flash-calcined kaolinite10.1346/CCMN.1985.0330313 ↗
6. A new concept of the transformation sequence of kaolinite to mullite10.1038/1811333a0 ↗
7. Modeling the combined impact of moisture and char shrinkage on the pyrolysis of a biomass particle10.1016/S0016-2361(03)00108-X ↗
8. Metakaolin, a solution for the precast industry to limit the clinker content in concrete: mechanical aspects10.1016/j.conbuildmat.2009.12.032 ↗
9. DTA study of preheated kaolinite in the mullite formation region10.1016/S0040-6031(02)00367-2 ↗
10. Chung · 1999 · 389
11. Flash dehydroxylation of kaolinite: the effect of heating rate on the properties of the calcine10.1007/BF01672044 ↗
12. Structural investigation and energetics of mullite formation from sol–gel precursors10.1021/cm00038a011 ↗
13. Increasing concrete durability with high-reactivity metakaolin10.1016/S0958-9465(00)00097-4 ↗
14. Thermal stability and pozzolanic activity of calcined kaolin10.1016/0169-1317(94)90018-3 ↗
15. Thermodynamics of polymorphic transformations in silica. Thermal properties from 5 to 1070K and pressure–temperature stability fields for coesite and stishovite10.1016/0016-7037(67)90003-8 ↗
16. Thermal behavior of the kaolin minerals10.6028/jres.014.037 ↗
17. Decomposition of limestone: the influence of CO2 and particle size on the reaction rate10.1016/0009-2509(95)00302-9 ↗
18. The sequence of phases in 900–1,050 C transformation of metakaoinite
19. Thermal conductivity and specific heat of kaolinite: evolution with thermal treatment10.1016/j.jeurceramsoc.2008.04.007 ↗
20. The kinetic analysis of the thermal decomposition of kaolinite by DTG technique10.1016/j.powtec.2010.11.035 ↗
21. The kinetics and mechanism of kaolin powder sintering I. The dilatometric CRH study of sinter-crystallization of mullite and cristobalite10.1016/j.powtec.2012.07.060 ↗
22. Metakaolin as cementitious material: history, scours, production and composition — a comprehensive overview10.1016/j.conbuildmat.2012.12.001 ↗
23. Robie · 1979
24. Metakaolin and calcined clays as pozzolans for concrete: a review10.1016/S0958-9465(00)00092-5 ↗
25. Pozzolanic properties of flash-calcined kaolinite: a comparative study with soak-calcined products10.1016/0008-8846(94)00118-I ↗
26. Modeling of combined heating and dehydroxylation of kaolinite particles during flash calcination; production of metakaolinite
27. Characteristics and applications of flash metakaolins10.1016/j.clay.2013.08.036 ↗
28. The effect of dehydroxylation/amorphization degree on pozzolanic activity of kaolinite10.1016/S0008-8846(02)00975-4 ↗
29. Evolution of structural changes during flash calcination of kaolinite10.1039/jm9910100361 ↗
30. Flash calcination of kaolinite: mechanistic information from thermogravimetry10.1039/JM9910100751 ↗
31. Flash calcines of kaolinite: effect of process variables on physical characteristics10.1007/BF01105062 ↗
32. Dehydroxylation of kaolinite to metakaolin—a molecular dynamics study10.1039/C0JM01748E ↗
33. Calcination of kaolinite clay particles for cement production: a modeling study10.1016/j.cemconres.2014.04.002 ↗
34. The mineral and locality database
35. Dehydroxylation of kaolinite, dickite and halloysite: heats of reaction and kinetics of dehydration at PH2O=15psi
36. Density functional modeling of the local structure of kaolinite subjected to thermal dehydroxylation10.1021/jp911108d ↗