Preparation, properties and phase transition of mesoporous hydromagnesite with various morphologies from natural magnesite

Hydromagnesite with different morphologies has been synthesized using magnesite as raw materials. The influences of pyrolysis temperature, the pH value of the magnesium bicarbonate solution and pyrolysis time on the preparation process of hydromagnesite were investigated. The synthesized samples wer...

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Veröffentlicht in:Powder technology 2020-03, Vol.364, p.822-830
Hauptverfasser: Wang, Yulian, Liu, Jiayi, Shi, Tianjiao, Yang, Bin, Li, Chuang, Xu, Hao, Yin, Wanzhong
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Sprache:eng
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Zusammenfassung:Hydromagnesite with different morphologies has been synthesized using magnesite as raw materials. The influences of pyrolysis temperature, the pH value of the magnesium bicarbonate solution and pyrolysis time on the preparation process of hydromagnesite were investigated. The synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fully automatic specific surface meter (BET). The phase transition process and mechanism of hydrated magnesium carbonate with different crystal structures were further explored. The results showed that porous rod-like, porous flower-like and lamellar hydromagnesite was prepared at above 70 °C, 90 min and different pH values. The specific surface area of porous rod-like, porous follower-like and lamellar hydromagnesite is 59.292m2/g, 34.568m2/g and 27.973m2/g, respectively. While the average pore sizes of the corresponding hydromagnesite are 15.172 nm, 15.368 nm and 17.132 nm, respectively. Based on the crystal assembly method, the structural stability of hydromagnesite is the highest compared with lansfordite and nesquehonite. [Display omitted] Typical SEM micrographs of porous rod-like, porous flower-like and lamellar hydromagnesite; Triangular plot of compositional characters of magnesite carbonates; Crystal structure of landsfordite, nesquehonite and hydromagnesite. •Porous rod-like, porous flower-like and lamellar hydromagnesite was prepared using natural magnesite.•The texture properties and shape features of hydromagnesite were characterized.•Hydromagnesite morphology has a significant effect on the texture properties.•Hydromagnesite owns the best structural stability compared with landfordite and nesquehonite.•The phase transformation mechanism of hydrated magnesium carbonate was investigated.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.01.090