Influence of magnesia in the infiltration of magnesia-spinel refractory bricks by different clinkers

Abstract

In cement production, which involves the production of cement clinker in rotary kilns, the main refractories used are magnesia-spinel bricks. These bricks may suffer infiltration by the clinker liquid phase, resulting in the corrosion of the spinel and the formation of low refractoriness mineralogical phases, such as the Q phase (C 20 A 13 M 3 S 3 ), which compromises refractory performance. Thus, the aim of this work is to correlate the infiltration resistance of magnesia-spinel bricks made from different grades of magnesia by clinker collected in three different cement plants (A, B and C). The purity of magnesia, besides its physical properties, strongly influences the properties and the infiltration resistance of magnesia-spinel bricks; as such the use of high grade magnesia is essential for producing high performance refractories.

Qualitative and quantitative investigation of post–mortem cement refractory: The case of magnesia–spinel bricks

“…Indeed, the dissolution of alite and spinel lead to the mayenite formation between 1000°C and 1350°C [24], probably, following the reaction (I) [4].…”

Influence of B2O3 doping on synthesis of MgTiO3 ceramics from recycled magnesia-hercynite materials

“…To address this concern, recycling and reusing these spent refractories has attracted significant attention [4][5][6][7]. Magnesiahercynite (MH) bricks have excellent performance and are widely used refractories in firing zone of cement kilns [8][9][10]. However, the MH bricks contain a certain amount of Fe 2 O 3 (abou 5%)and CaO (about 2%), which limits their reuse [1].…”