Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Abstract

This article aims to investigate the corrosion resistance of novel fly ash–based forsterite–spinel (Mg2SiO4-MgAl2O4) refractory ceramics to various corrosive media in comparison with reactive alumina–based ceramics. Because fly ash is produced in enormous quantities as a byproduct of coal-burning power stations, it could be utilized as an affordable source of aluminum oxide and silicon oxide. Corrosion resistance to iron, clinker, alumina, and copper was observed by scanning electron microscope with an elemental probe. The influence on the properties after firing was also investigated. Fly ash–based and reactive alumina–based mixtures were designed to contain 10%, 15% and 20% of spinel after firing. Raw material mixtures were sintered at 1550 °C for two hours. X-ray diffraction analysis and scanning electron microscopy were used to analyze sintered samples. The apparent porosity, bulk density, modulus of rupture, and refractory and thermo–mechanical properties were also investigated. The experimental results disclosed that the modulus of rupture, thermal shock resistance and microstructure were improved with increasing amounts of spinel in the fired samples. An analysis of the transition zones between corrosive media and ceramics revealed that all mixtures have good resistance against corrosion to iron, clinker, aluminum and copper.

Investigation of Mechanochemically Treated Municipal Solid Waste Incineration Fly Ash as Replacement for Cement

“…Due to the high concentrations of CaO, SiO 2 , Al 2 O 3 , Fe 2 O 3 , MgO, etc., in fly ash, several researchers have studied the utilization and recovery of MSWI fly ash to prevent adverse environmental risks, including its utilization as a raw material for tile manufacturing and as a substitute for ordinary sand in concrete [11][12][13][14]. In previous studies, coal-fired fly ash and MWSI bottom ash have been studied for their potential use in concrete, road pavement, ceramics, and so on [15][16][17][18][19][20]. When MSWI fly ash is added to cement-based products, to meet the technical and environmental requirements, such as enough strength, durability performance, and leaching limits of heavy metals from the products, pre-treatment is necessary to reduce the leaching of hazardous components [21,22].…”

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

“…Forsterite melts at 1905 °C, which is suitable for the manufacturing of refractory products [17][18][19]. Also, some characteristics of forsterite are low thermal conductivity, good volume stability, low expansion, and better resistance to high-iron slags compared to magnesia.…”

Получение стеклокерамики системы MgO-SiO-=SUB=-2-=/SUB=- методом плазменной плавки

“…DOI: 10.21883/PJTF.2022. 24.54017.19278 Синтез стеклокристаллических материалов системы MgO−SiO 2 является актуальной задачей ввиду широкой сферы их применения во многих высокотехнологичных производствах [1][2][3]. В данной системе существуют два бинарных соединения: ортосиликат магния Mg 4 SiO 2 (форстерит) и метасиликат магния MgSiO 3 , имеющий три полиморфные модификации (энстатит, клиноэнстатит и протоэнстатит) [4].…”