HIGH ALUMINA BRICKS FOR REFRACTORY LINING OF ROOF OF ROTARY HEARTH FURNACE AND PROCESS FOR ITS PRODUCTION.

摘要

The present invention relates to providing High Alumina Bricks for refractory lining of roof in Rotary Hearth Furnace having high Thermal shock Resistance combined with high Refractoriness under load(RUL) as well as high volume stability suitable for use as refractory lining of roof in Rotary hearth furnace of sprung arch type such as in Wheel & Axle plant and a method of manufacturing said High Alumina brick. The High Alumina Bricks according to the invention are having minimum thermal shock resistance of 30 cycles (as per small prism test under IS: 1528 Part III) coupled with Refractoriness under load (RUL) of minimum 1550 OC ( ta , as per IS: 1528 Part II) and high volume stability by way of Repeat Permanent linear change (Repeat PLC) comprising: Repeat PLC, %, At 1500 0C of 1st PLC: ± 0.20; 2nd PLC: - 0.15 to + 0.10; 3rd PLC: ± 0.10.