以白云石为原料氨碱法制备球霰石及其生成机理研究

doi:10.11962/1006-4990.2020-0339

Abstract

Abstract:

Calcium carbonate with high content of vaterite was prepared by imitating Solvay ammonia-alkali method with dolomite as starting material in alkaline environment.The results of XRD and SEM showed that the product with carbonization temperature of 20~40 ℃ was vaterite,40~60 ℃ was calcite and 60~90 ℃ was aragonite.The high magnification SEM of vaterite showed that the product had many microporous structures.The specific surface area of the product was determined to be 32.653 m²/g and the pore size was 2.972 nm.It provides a good space for the loading of biomolecules.The analysis of the formation mechanism of vaterite showed that the NH₄⁺-NH₃ buffer system could not only increase the supersaturation of calcium carbonate in the solution,but also improve the solution environment and provide a good solution environment for the growth of vaterite.The trace amount of Mg²⁺ in the solution played a role in promoting the formation of intact crystal forms.

Key words: dolomite, buffer system, vaterite, calcium carbonate

CLC Number:

TQ132.32

Fan Tianbo,Jia Xiaohui,Han Dongxue,Chen Si,Jiang Yu,Hu Tingting,Guo Hongfan,Li Li,Liu Yunyi. Study on preparation of vaterite from dolomite by ammonia-alkali method and its mechanism[J]. Inorganic Chemicals Industry, 2021, 53(5): 56-60.

Figures/Tables 9

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Study on preparation of vaterite from dolomite by ammonia-alkali method and its mechanism

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