Except for some parts (such as magnesia brick furnace bottom), most of the refractory brick masonry is built with refractory mortar. High-quality refractory mortar should have certain working properties, and during the subsequent baking and heating machine operation periods, the refractory bricks should be firmly bonded to each other, the brick seams should be dense, and they should be resistant to high temperature and the erosion of furnace gas and slag.
refractory mortar is the dry component of refractory mortar, and its chemical composition, chemical resistance, thermal expansion rate, etc. should be close to the corresponding properties of the masonry refractory bricks. As a slurry, it should have certain cohesiveness, air permeability, refractoriness and mechanical strength.
Refractory clay is generally composed of clinker and bound clay. Clinker is the basic component, and bound clay is a binder, which can be dispersed in water and increase the plasticity of refractory clay. The larger the clinker particle size, the more bound clay content: the more clinker content, the higher the mechanical strength: the more bound clay content, the lower the air permeability.
The consistency of refractory mortar is related to the thickness of brick joints. Thick mud is used for masonry 4~6mm brick joints; semi-dense mud is used for masonry 2~3mm brick joints. The following are clay refractory mortar (GB/T 14982-2008)
Clay refractory mortar is suitable for clay products, and is divided into two categories and 5 grades according to AL2O3 content and bonding strength. Ordinary clay refractory mortar: NN-30, NN-38, NN-42, NN-45A: phosphate-bonded clay refractory mortar NN-45B.
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