Inorganic Chemicals Industry >
Study on preparation of vaterite from dolomite by ammonia-alkali method and its mechanism
Received date: 2020-08-11
Online published: 2021-05-12
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
Tianbo Fan , Xiaohui Jia , Dongxue Han , Si Chen , Yu Jiang , Tingting Hu , Hongfan Guo , Li Li , Yunyi Liu . Study on preparation of vaterite from dolomite by ammonia-alkali method and its mechanism[J]. Inorganic Chemicals Industry, 2021 , 53(5) : 56 -60 . DOI: 10.11962/1006-4990.2020-0339
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