The blast furnace is a steel stack lined with refractory brick, where raw materials require 6/8 hours to descend to the bottom to become the final product of liquid iron and slag at a temperature of about 1550 °C. The liquid products trickle down to collect in the base of the furnace, or hearth, where they are extracted at regular intervals. The slag is the non-metallic output. This paper attempts to provide an overview of BF slag in general and puts forward a proposal for using its sensible heat by an indigenous technology. A schematic diagram given below shows the major components of a BF.
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