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.Tutkimustuotos › › vertaisarvioitu
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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 -