Gupta A.D.,University of Kolkata |
Mukhopadhyay B.C.,SAIL Bokaro Steel Plant
InterCeram: International Ceramic Review | Year: 2013
The Bokaro Steel Plant of the Bokaro Steel Authority of India Ltd. (BSL-SAIL) is India's largest flat steel producer. It has five 2000-2500 m 3 capacity (useful volume) blast furnaces for production of hot metal. These furnaces are currently producing 11,550 mt of processed metal on a daily basis. The five furnaces are operated at a top pressure of 1.0-1.65 kg/cm2, with average productivity of 1.55 mt/m3/day of hot metal at a temperature of 1480-1510°C. In the Bokaro Steel Plant, each blast furnace (BF) has twin cast houses offset from each other by 180°. To increase the productivity of the BFs, there is continual demand for ever higher throughput of hot metal tonnage from the cast house through the main trough, metal runners and other parts of the plant, and a desire to move to hotter metal temperatures. The throughput and operational life of BF troughs and runners depends on the characteristics of their refractory components, lining design, installation, and maintenance and operating regimes. The paper describes the details of refractory-related operating parameters, product (Al 2O3-SiC-C) characteristics, trough/ runner material reactions in contact with iron, slag and air/slag interfaces, installation techniques, and causes of lining wear and other critical issues. New generation Al2O3-SiC-C low moisture castables with varied SiC content were also created and tested for strength and slag resistance.