Industrial applications and properties of magnesia-spinel materials

6 Industrial applications and properties of magnesia-spinel materials 

1 Type and effect of the additives in magnesia-spinel refractories (CaO, Si02 and Fe203) 

CaO/SiC 2 (C/S) ratio (wt%) 1. C/S 1.87 CaOfree + MgAI204 — calcium aluminates CaOfree + SO3 — CaS04 Decrease of refractoriness, abrasion4 Infiltration  

Service conditions, selection and installation of refractories, quality of raw materials and refractory materials are important parameters in increasing the 

Stress begins to build near the hot face at low temperatures. The Young s modulus of a brick is lower at the maximum hot face temperature of 1450°C. Thus the stress is reduced near the hot face. The maximum stress is transferred towards the interior of the brick as the hot face temperature rises. High stress is developed towards the hot face of the brick. The lower the thermal conductivity, the higher the rate of thermal expansion, and the higher the Young s modulus, the greater the stress.67 

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