自石灰石矿粉中直接提取CaCO<sub>3</sub>晶须的碳化-分解法研究<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.016.028

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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.

Key words： CaCO₃ whisker limestone carbonation-decomposition

Published: 07 May 2018

CLC number:

TQ177

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	Articles by authors
	TONG Yu
	ZHAO Li
	LI Wanhong
	LI Xiao
	WANG Qing
	ZENG You

Cite this article:

TONG Yu,ZHAO Li,LI Wanhong, et al. Direct Extraction of CaCO₃ Whiskers from Limestone Powders by a Combined Method of Carbonation and Thermal Decomposition[J]. Materials Reports, 2017, 31(16): 134-137.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.016.028 OR http://www.mater-rep.com/EN/Y2017/V31/I16/134

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