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

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Utilizing mixed-mineralogy ferroan magnesite tailings as the source of magnesium oxide in magnesium potassium phosphate cement. / Ismailov, Arnold ; Merilaita, Niina; Solismaa, Soili; Karhu, Marjaana; Levänen, Erkki.

julkaisussa: Construction and building materials, Vuosikerta 231, 117098, 20.01.2020.

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Bibtex - Lataa

@article{c560fed8cf344b969a8204c9cb68c5a7,

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",

note = "EXT={"}Karhu, Marjaana{"}",

year = "2020",

month = "1",

day = "20",

doi = "10.1016/j.conbuildmat.2019.117098",

language = "English",

volume = "231",

journal = "Construction and building materials",

issn = "0950-0618",

publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Utilizing mixed-mineralogy ferroan magnesite tailings as the source of magnesium oxide in magnesium potassium phosphate cement

AU - Ismailov, Arnold

AU - Merilaita, Niina

AU - Solismaa, Soili

AU - Karhu, Marjaana

AU - Levänen, Erkki

N1 - EXT="Karhu, Marjaana"

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

U2 - 10.1016/j.conbuildmat.2019.117098

DO - 10.1016/j.conbuildmat.2019.117098

M3 - Article

VL - 231

JO - Construction and building materials

JF - Construction and building materials

SN - 0950-0618

M1 - 117098

ER -

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