Why are refractory linings important in copper converters?

Refractory linings are essential in copper converters because they protect the steel shell of the vessel from the extreme heat and highly corrosive environment inherent in the conversion process.12

In a copper converter, molten matte is subjected to intense exothermic reactions as air or oxygen is blown through the bath to oxidize iron and sulfur. These reactions generate significant heat, which must be contained to maintain the liquid state of the bath and ensure the efficiency of the metallurgical process.13

Because the converter operates at high temperatures and involves contact with corrosive molten materials and gases, the refractory brick lining must possess several critical properties:

• High melting point: To withstand the intense heat of the molten bath.2
• Chemical inertness: To resist corrosion from the reactive slag and gases produced during oxidation.2
• Thermal shock resistance: To prevent the lining from cracking when subjected to the rapid temperature changes that occur during batch operations, such as charging, skimming, and pouring.23

By providing this protective barrier, the refractory lining ensures the structural integrity of the converter while facilitating the transformation of matte into blister copper.12