The different steps involved in cupola furnace operation process are : 1. Preparation Of Cupola . The First Operation in preparing a cupola is to clean out the slag and refuse on the lining and around the tuyeres from the previous run. Any bad spots or broken bricks are repaired with a daubing mixture of fire clay and silica sand or ganister . The preparation of the sand bottom in cupola is begun as soon as the patching of the lining has been completed. The bottom doors are raised and held in this position by metal props. The bottom sand is introduced through the charging door and is rammed well around the lining and across the intersection of the bottom doors. This layer of sand is built up to a height of 100 to 200 mm above the cast iron door. The surface of the sand bottom is sloped from all direction towards the tapping hole so that the molten metal can be drained completely from the cupola at any time. An opening about 35 mm diameter is provided for the removal of the slag, a
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