Analysis of the effect of syenite alkali aluminium concentrate (SAAC) on the properties of ceramic products containing the centrifugation waste of a mineral wool melt

Effect of Mechanically Activated Nepheline-Syenite Additive on the Physical–Mechanical Properties and Frost Resistance of Ceramic Materials Composed of Illite Clay and Mineral Wool Waste

“…With the increasing amount of NS to 20 and 25%, when the SiO 2 /Na 2 O + K 2 O ratio decreases to 7.92 and 6.88, the compressive strength after firing at a temperature of 1000 • C increases by 61.5 and 41.0%, after firing at a temperature of 1020 • C by 53.5 and 32.6%, and after firing at a temperature of 1040 • C by 38.8 and 24.5% compared to the compressive strength of the reference C W sample. The development of mechanical properties in the samples is confirmed by previous studies [10], where it was concluded that NS additive affected the crystallisation of the minerals in the ceramic body, since during firing, NS melted and active K + and Na + ions diffused into the ceramic body. During the diffusion of Na + ions into the ceramic body, the mineral labradorite is formed, and in the case of K + ions, the mineral leucite is crystallised.…”

“…This study used the mineral wool melt waste (MWMW) and the fluxing additive mechanically activated nepheline-syenite (NS) to investigate the low-melting illite clay obtained from the factory of ceramic products. The clay mineral composition presents illite, chlorite, calcite, silica, dolomite, and feldspar minerals, as pointed out in previous research [10]. Before using the clay, it was dried at 100 (±5 • C), and then ground in a laboratory ball mill.…”

“…In the research [9][10][11], the use of waste from the production of mineral wool as a substitute for sand in the composition of ceramics has been proposed. This is due to the fact that mineral wool waste melts at temperatures above 1100 • C. The use of mineral wool can lead to an increase in the compressive strength of ceramic samples.…”

“…This is due to the fact that mineral wool waste melts at temperatures above 1100 • C. The use of mineral wool can lead to an increase in the compressive strength of ceramic samples. However, it significantly increases the water absorption of the samples, which could negatively affect their functional properties, particularly their frost resistance [10,12].…”

“…The addition of ground nepheline-syenite influences the porosity of the ceramic body by modifying the pore size [37,53]. These changes in pore size within the ceramic body [10,34] improve the physical and mechanical properties of the ceramic body. However, more detailed studies on how nepheline-syenite changes the structure of the ceramic body as well as the distribution of pores by size, and thereby manages the physical and mechanical properties have not been sufficiently carried out.…”