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[October 2002]
New Brick Offers Resistance to Highly Basic Slags
A range of heavily matrix enhanced products with specific applications to soda rich slags has recently been introduced by Dyson Refractories.Dybond 80 KF is a high fired, direct bonded magnesite chrome brick based upon fused grain raw materials with textural modification. Typical applications are processes which are primarily basic in nature but where some tolerance of acidic process stages or atmospheres is required.
Over the last decade, Dyson Refractories' Dybond and Dymax magnesite chrome product ranges are said, whilst operating in the most severe environments, to have gained an excellent reputation within the melting point of non-ferrous and precious metals.
Post mortem examinations of used refractories from these applications identified the need for a material with enhanced resistance to highly basic slags (specifically soda) and alkaline metals, whilst maintaining a degree of tolerance to acidic components from either the slag or atmosphere. Secondary requirements were to enhance the texture of the refractory matrix, thereby reducing impregnation by low viscosity liquid phases into the matrix. Limitation of impregnation prevents structural spalling resulting from redox reactions or densification mechanisms.
The textural enhancement of the brick has been achieved by matrix modification techniques and has given a fine pore distribution network while maintaining an overall porosity of 16.5% to ensure thermal shock resistance is high.
The product offers good cold compressive strength with very high hot strength and low modulus of elasticity.
ENDS