Utilizing mixed-mineralogy ferroan magnesite tailings as the source of magnesium oxide in magnesium potassium phosphate cement

Arnold Ismailov (Corresponding Author), Niina Merilaita, Soili Solismaa, Marjaana Karhu, Erkki Levänen

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    A mixed-mineralogy talc mine tailing (MT) fraction consisting of 80% ferroan magnesite (MgCO3) was studied for utilization as the source of magnesium oxide (MgO) in magnesium potassium phosphate cement (MKPC). The effects of calcination temperature of this low-grade magnesite on the composition, BET surface area and phosphate reactivity of the resulting magnesia powder were studied. The 4-point flexural strength of resulting MKPC was measured for all calcined raw material fractions that produced a solid. Based on the strength measurement results, the optimal range for calcination resided between 700 °C and 1150 °C, which is drastically lower than commonly recommended for finer magnesia sources in MKPCs. Accelerated reactivity assessment showed that phosphate reactivity behavior could not be entirely predicted by BET surface area. The presence of impurity silicates and high iron content in all the constituent minerals was posed as the reason for densification and loss of reactivity at higher calcination temperatures.

    Original languageEnglish
    Article number117098
    JournalConstruction and Building Materials
    Volume231
    DOIs
    Publication statusPublished - 20 Jan 2020
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Magnesium Oxide
    Magnesite
    Mineralogy
    Magnesia
    Tailings
    Calcination
    Magnesium
    Potassium
    Cements
    Phosphates
    Talc mines
    Silicates
    Densification
    Surface structure
    Bending strength
    Powders
    Minerals
    Raw materials
    Iron
    Impurities

    Keywords

    • Bending strength
    • Chemically bonded ceramics
    • MgO
    • Mixed-mineralogy
    • pH
    • Phosphate cement
    • Surface area

    Cite this

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    title = "Utilizing mixed-mineralogy ferroan magnesite tailings as the source of magnesium oxide in magnesium potassium phosphate cement",
    abstract = "A mixed-mineralogy talc mine tailing (MT) fraction consisting of 80{\%} ferroan magnesite (MgCO3) was studied for utilization as the source of magnesium oxide (MgO) in magnesium potassium phosphate cement (MKPC). The effects of calcination temperature of this low-grade magnesite on the composition, BET surface area and phosphate reactivity of the resulting magnesia powder were studied. The 4-point flexural strength of resulting MKPC was measured for all calcined raw material fractions that produced a solid. Based on the strength measurement results, the optimal range for calcination resided between 700 °C and 1150 °C, which is drastically lower than commonly recommended for finer magnesia sources in MKPCs. Accelerated reactivity assessment showed that phosphate reactivity behavior could not be entirely predicted by BET surface area. The presence of impurity silicates and high iron content in all the constituent minerals was posed as the reason for densification and loss of reactivity at higher calcination temperatures.",
    keywords = "Bending strength, Chemically bonded ceramics, MgO, Mixed-mineralogy, pH, Phosphate cement, Surface area",
    author = "Arnold Ismailov and Niina Merilaita and Soili Solismaa and Marjaana Karhu and Erkki Lev{\"a}nen",
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    Utilizing mixed-mineralogy ferroan magnesite tailings as the source of magnesium oxide in magnesium potassium phosphate cement. / Ismailov, Arnold (Corresponding Author); Merilaita, Niina; Solismaa, Soili; Karhu, Marjaana; Levänen, Erkki.

    In: Construction and Building Materials, Vol. 231, 117098, 20.01.2020.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Ismailov, Arnold

    AU - Merilaita, Niina

    AU - Solismaa, Soili

    AU - Karhu, Marjaana

    AU - Levänen, Erkki

    PY - 2020/1/20

    Y1 - 2020/1/20

    N2 - A mixed-mineralogy talc mine tailing (MT) fraction consisting of 80% ferroan magnesite (MgCO3) was studied for utilization as the source of magnesium oxide (MgO) in magnesium potassium phosphate cement (MKPC). The effects of calcination temperature of this low-grade magnesite on the composition, BET surface area and phosphate reactivity of the resulting magnesia powder were studied. The 4-point flexural strength of resulting MKPC was measured for all calcined raw material fractions that produced a solid. Based on the strength measurement results, the optimal range for calcination resided between 700 °C and 1150 °C, which is drastically lower than commonly recommended for finer magnesia sources in MKPCs. Accelerated reactivity assessment showed that phosphate reactivity behavior could not be entirely predicted by BET surface area. The presence of impurity silicates and high iron content in all the constituent minerals was posed as the reason for densification and loss of reactivity at higher calcination temperatures.

    AB - A mixed-mineralogy talc mine tailing (MT) fraction consisting of 80% ferroan magnesite (MgCO3) was studied for utilization as the source of magnesium oxide (MgO) in magnesium potassium phosphate cement (MKPC). The effects of calcination temperature of this low-grade magnesite on the composition, BET surface area and phosphate reactivity of the resulting magnesia powder were studied. The 4-point flexural strength of resulting MKPC was measured for all calcined raw material fractions that produced a solid. Based on the strength measurement results, the optimal range for calcination resided between 700 °C and 1150 °C, which is drastically lower than commonly recommended for finer magnesia sources in MKPCs. Accelerated reactivity assessment showed that phosphate reactivity behavior could not be entirely predicted by BET surface area. The presence of impurity silicates and high iron content in all the constituent minerals was posed as the reason for densification and loss of reactivity at higher calcination temperatures.

    KW - Bending strength

    KW - Chemically bonded ceramics

    KW - MgO

    KW - Mixed-mineralogy

    KW - pH

    KW - Phosphate cement

    KW - Surface area

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