Direct Extraction of CaCO3 Whiskers from Limestone Powders by a Combined Method of Carbonation and Thermal Decomposition
TONG Yu1, ZHAO Li1, LI Wanhong1, LI Xiao1, WANG Qing1, ZENG You2
1 School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168; 2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
Abstract: With a purpose of realizing the low-cost production of CaCO3 whiskers, a feasible way was proposed in this work by making use of natural limestone powders as the starting material, which was transferred partly into Ca(HCO3)2 due to the contribution of CO2 dissolved in water. Once the soluble Ca(HCO3)2 decomposed under elevated temperature ranged from 60 ℃ to 90 ℃, CaCO3 whiskers with a uniform morphology of short needle were obtained. According to the observations under scanning electron microscope (SEM), along with the analysis based on X-ray diffraction (XRD), the great contribution of decomposition temperature was revealed, and as a result, both the length and aspect ratio of such CaCO3 whiskers increased evidently with the increase of decomposition temperature. Further increase of the decomposition temperature above 80 ℃ gave rise of the transformation of aragonite to calcite. The experimental results suggested the most promising conditions for the production of CaCO3 whisker, i. e., 80 ℃, 2 h, which was effective to obtained CaCO3 whisker with an average length of 14.61 μm and an aspect ratio about 8.10.
佟钰, 赵立, 李宛鸿, 李晓, 王晴, 曾尤. 自石灰石矿粉中直接提取CaCO3晶须的碳化-分解法研究*[J]. 《材料导报》期刊社, 2017, 31(16): 134-137.
TONG Yu, ZHAO Li, LI Wanhong, LI Xiao, WANG Qing, ZENG You. Direct Extraction of CaCO3 Whiskers from Limestone Powders by a Combined Method of Carbonation and Thermal Decomposition. Materials Reports, 2017, 31(16): 134-137.
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2017, Vol. 31 
