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| OPERATING PRACTICE FOR LONG LINING LIFE: |
| Temperature control: |
| For safe furnace operation and long lining life it is essential that the maximum temperature is not unduly exceeded beyond the safe temperature. In fact by paying more attention to metal temperature control by raising it not more than what is necessary, one can considerably increase the lining life.
At low metal temperature there is a tendency to oxidize silicon form the metal and produce a highly siliceous slag which may build up on the furnace walls. Si + 02 = Si02 With increase in metal temperature, silicon oxidation becomes less and at some temperature the melt remains under equilibrium. At still higher temperatures, the carbon in the melt reacts with silica lining to reduce it is silicon and liberates gaseous carbon monoxide. Si01 +2C = Si + 2 CO This carbon monoxide can be seen bubbling near furnace walls when metal is held at high temperature. Slag attack on lining also increases with increases in temperature. Thus at higher temperatures the lining is under server attack both form metal as well as from slag. In addition, the following practices also help increasing the lining life. |
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