Blast Furnace Cast House and its Operation Jun06

Blast Furnace Cast House and its Operation...

Blast Furnace Cast House and its Operation  The blast furnace (BF) cast house is the working area where hot metal and liquid slag are tapped from the blast furnace and either poured into ladles (torpedo car or open top ladle) or led off for solidification (pig casting and slag granulation) or treatment (cast house desulphurization). A good trouble free cast house operation is an important requirement in a high productivity blast furnace for low cost operation. The cast house functional design, operational practice, refractory technology, automation and environmental requirements are important issues which are required to be looked into to meet the demands for greater reliability and output from the cast house. In any blast furnace cast house is the most labour intensive area in the entire BF operation. Its design must be fully integrated with the expected hot metal production, hearth volume, and tapping practice whilst minimizing use of labour, maintenance, materials and improving working environment. The prime objective is to remove the liquid iron from the blast furnace at a casting rate and through a number of casts per day that is determined by the smelting rate, effective hearth volume, and the desire to maintain the hearth in a ‘dry’ condition rather than by the availability of the cast house troughs, runners and cast house equipment. Typical lay out of a BF cast house is shown in Fig 1 Fig 1 Typical layout of a BF cast house  The design and operation of the cast house must improve the efficiency of BF operation with respect to the following parameters. Improvement in the working conditions for workmen engaged in tapping of the hot metal and liquid slag Reduction in the losses of heat from the hot metal by maintaining its temperature Reduction in...