Relationship Between Microstructure and Properties of Limestone Calcined Rapidly at High Temperatures
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The relationship between microstructure and physicochemical properties of limestone including, porosity, bulk density, pore size distribution, specific surface area and activity were studied under the condition of rapid heating from room temperature to 1350–1550 °C. The results showed that complete decomposition of limestone (diameter 12.5–15 mm) at 1350 °C, 1450 °C and 1550 °C took 11.7 min, 9.2 min and 6.9 min, respectively. With the prolongation of calcination, lime porosity first increased and then decreased. The peak value of lime porosity was found roughly at the end of limestone decomposition. The variation of bulk density, however, was just the opposite compared to porosity. When calcination temperature increased, the pore size of lime became larger, and the number of micropores decreased correspondingly; furthermore, while calcination time increased, micropores disappeared fast, and macropores increased rapidly. The specific surface area of lime decreased with prolonged calcination time. The best activity of lime could be obtained with high porosity and high specific surface area at the same time. The maximum activity values of lime were 379 mL, 365 mL and 267 mL at the temperatures of 1350 °C, 1450 °C and 1550 °C, respectively.
KeywordsLimestone High-temperature calcination Microstructure Physicochemical property Activity of lime
The authors gratefully acknowledge the National Natural Science Foundation of China for financially supporting this work (No. 51374160).
ZX conceived and designed the experiments, JC did SEM and the EDS analyses, and BH assisted the experiment. LW contributed to the experimental part, analyzed the data and wrote the paper.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
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