Effects of Different Ions in Dolomite Refining Solution on Calcium Carbonate Whiskers

Abstract

Abstract: Dolomite mineral deposits are abundant and widely distributed in our country.Calcium carbonate whiskers were prepared by gas-liquid contact method using dolomite refining solution and carbon dioxide as experimental raw materials. The effects of impurity ions Mg²⁺, NH⁺₄ and NO^-₃ on the aspect ratio and morphology of calcium carbonate whiskers were studied. Morphology and phase structure of the products were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the morphology and aspect ratio of calcium carbonate whiskers are the best when the concentration of NH⁺₄ is 0.3 mol/L, the concentration of Mg²⁺ is 0.05 mol/L, and the concentration of NO^-₃is 0.2 mol/L, the aspect ratio reaches above 25 at the highest. Finally, the crystallization process and growth mechanism of calcium carbonate whiskers are explained by combining with crystal growth theory.

Key words: dolomite, carbon dioxide, impurity ion, gas-liquid contact method, calcium carbonate whisker, morphology, aspect ratio

CLC Number:

WANG Dongyi, ZHENG Qiang, YU Yajie, XU Shaowei, WANG Yubo, DENG Xiaoyang, CAO Xiaoning, YUE Yan, LI Xue, LIU Yunyi. Effects of Different Ions in Dolomite Refining Solution on Calcium Carbonate Whiskers[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(5): 908-914.

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