Refractory bricks for firing zone are the key to the production and operation of new dry process cement rotary kiln. At present, the refractory bricks available for selection and application include magnesium dolomite brick, magnesium aluminum spinel brick, magnesium zirconium brick and magnesium chromium brick, and magnesium chromium brick is sometimes the material with the best adaptability and the highest cost performance. However, hexavalent chromium is a highly toxic heavy metal pollutant, which has been banned by relevant international institutions. However, because dolomite brick is very easy to hydrate, the thermal conductivity of magnesium zirconium brick is too high, the kiln skin adhesion of magnesium aluminum spinel brick is poor, and its application effect is not ideal. Therefore, magnesium iron aluminum spinel brick is suitable for chromium free application in cement rotary kiln firing belt, because magnesium iron aluminum spinel brick has the following remarkable characteristics.
1) The thermal conductivity is not high, lower than that of magnesium zirconium brick
2) The hanging kiln skin has good performance and is easy to form. The hanging kiln skin has good performance and stability, which is better than that of magnesium chromium brick
3) Good thermal shock stability
4) Good alkali corrosion resistance, no alkali crack and looseness
At present and in the future, magnesia iron aluminum spinel brick is a very suitable refractory brick for the firing belt of dry process cement rotary kiln, which realizes chromium free, eliminates environmental pollution and meets the use requirements. The magnesia iron aluminum spinel brick supplied by our company has low thermal conductivity, superior hanging kiln skin performance and good stability, excellent alkali corrosion resistance and service life of more than 12 months, Well received by users at home and abroad
