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

Arnold Ismailov; Niina Merilaita; Soili Solismaa; Marjaana Karhu; Erkki Levänen

doi:10.1016/j.conbuildmat.2019.117098

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

BA5501 Industrial circular economy

Research output: Contribution to journal › Article › Scientific › peer-review

17 Citations (Scopus)

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 language	English
Article number	117098
Journal	Construction and Building Materials
Volume	231
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.117098
Publication status	Published - 20 Jan 2020
MoE publication type	A1 Journal article-refereed

Keywords

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

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10.1016/j.conbuildmat.2019.117098

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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",

note = "Funding Information: This work was done within the CeraTAIL project as part of MISU-program financed by the Academy of Finland. We thank the Academy of Finland (grant number 292564) for financial support. We sincerely thank Dr. Marja-Liisa R{\"a}is{\"a}nen at Geological Survey of Finland (GTK) Kuopio for contribution to mineralogical characterization. We would also like to extend our gratitude to Miss Nelli Palmu at Tampere University (TAU) for accommodating prolonged pH measurements and MSc Leo Hyv{\"a}rinen at Tampere University (TAU) for help with XRD analysis. Publisher Copyright: {\textcopyright} 2019 The Authors Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

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

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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 - Funding Information: This work was done within the CeraTAIL project as part of MISU-program financed by the Academy of Finland. We thank the Academy of Finland (grant number 292564) for financial support. We sincerely thank Dr. Marja-Liisa Räisänen at Geological Survey of Finland (GTK) Kuopio for contribution to mineralogical characterization. We would also like to extend our gratitude to Miss Nelli Palmu at Tampere University (TAU) for accommodating prolonged pH measurements and MSc Leo Hyvärinen at Tampere University (TAU) for help with XRD analysis. Publisher Copyright: © 2019 The Authors Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

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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JO - Construction and Building Materials

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ER -

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

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Keywords

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