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Chromium-zirconium corundum refractory castable becomes a new-generation melting furnace high-temperature zone environmentally friendly furnace lining
Dec 17, 2018

Foreword


In the oxidizing atmosphere melting furnace, the lining mainly consists of chrome corundum refractory castables. However, the high temperature zone in the furnace has a temperature of up to 2000 °C. With the recognition of environmental hazards caused by the high temperature of Cr2O3, and the traditional chrome corundum Refractory castables cannot meet the longevity requirements of kiln because of their poor thermal shock resistance. Therefore, there is an urgent need for a refractory castable product with low chrome and thermal shock resistance.


Chromium zirconium refractory castable


1. Performance characteristics of chrome-zirconium corundum refractory castable


The chromium zirconium corundum refractory castable is a proportion of zirconia fine powder added to the chrome corundum refractory castable. Although the chromium content of this refractory castable is greatly reduced, the addition of zirconia does not affect the slag corrosion resistance of the material.


On the contrary, since the melting point temperature of zirconium is very high, it is 2700 °C. At the same time, the zirconia material itself is not oxidized and has a high density. The cost is also much lower than that of chrome corundum refractory castables. Therefore, the chrome-zirconium corundum refractory castable has the characteristics of high temperature chemical stability, high load softening temperature, slag corrosion resistance, oxidation resistance, thermal shock resistance and no pollution.


 


2. Application of chrome-zirconium corundum refractory castable


The chromium zirconium corundum refractory castable is mainly used in the high temperature region of the oxidizing atmosphere melting furnace because of its excellent high temperature corrosion resistance and thermal shock resistance, for example, the slag portion of the gasification melting furnace.


Conclusion


The chrome-zirconium corundum refractory castable has become the low-chromium refractory castable with the highest application rate in the high temperature region of the domestic oxidizing atmosphere melting furnace. The application of the refractory castable not only has superiority in high temperature performance, but also relatively high cost performance. Industrial change ideas for low chrome in high temperature furnaces. It is a green economy high temperature refractory castable.


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