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Effect of B[sub.2]O[sub.3] Addition and CaO/Al[sub.2]O[sub.3] Ratios on Melt Structure and Viscosity of CaO–Al[sub.2]O[sub.3]-Based Slags

Metals (Basel ), 2022-07, Vol.12 (8) [Peer Reviewed Journal]

COPYRIGHT 2022 MDPI AG ;ISSN: 2075-4701 ;EISSN: 2075-4701 ;DOI: 10.3390/met12081255

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  • Title:
    Effect of B[sub.2]O[sub.3] Addition and CaO/Al[sub.2]O[sub.3] Ratios on Melt Structure and Viscosity of CaO–Al[sub.2]O[sub.3]-Based Slags
  • Author: Zhang, Xiaobo ; Liu, Chengjun ; Jiang, Maofa
  • Subjects: Lime
  • Is Part Of: Metals (Basel ), 2022-07, Vol.12 (8)
  • Description: The effect of the addition of B[sub.2]O[sub.3] and the CaO/Al[sub.2]O[sub.3] ratios on the CaO–Al[sub.2]O[sub.3]–B[sub.2]O[sub.3] melts’ structure was fully analyzed by molecular dynamics (MD) simulations. The results show that, with the increase in CaO/Al[sub.2]O[sub.3] ratios, the charge compensation for [AlO[sub.4]][sup.5−] tetrahedron changed from the oxygen tricluster structure to the charge provided by Ca[sup.2+], and the structure of [AlO[sub.4]][sup.5−] tetrahedron was stabilized. The addition of B[sub.2]O[sub.3] reduced the degree of polymerization of the aluminate melt, which, in turn, lowered the melt viscosity; in the systems with CaO/Al[sub.2]O[sub.3] mole ratio less than 1, the added B[sub.2]O[sub.3] mainly existed in the form of [BO[sub.3]][sup.3−], which reduced the symmetry and the strength of the melt network structures; in the higher CaO/Al[sub.2]O[sub.3] ratio systems, the depolymerization ability of the addition of B[sub.2]O[sub.3] on aluminate network structures was enhanced with the increase in CaO/Al[sub.2]O[sub.3] ratios, and the overall degree of polymerization of the melt decreased. The viscosity measurement shows that B[sub.2]O[sub.3] lowers the viscosity of CaO–Al[sub.2]O[sub.3] melts, which was consistent with the results predicted by MD simulations.
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 2075-4701
    EISSN: 2075-4701
    DOI: 10.3390/met12081255
  • Source: AUTh Library subscriptions: ProQuest Central
    ROAD: Directory of Open Access Scholarly Resources
    DOAJ Directory of Open Access Journals
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