The final result of processing of primary aluminum is aluminum ingots of various standards. Later on the cylindrical columns are made from the obtained ingots, from which for instancealuminum extrusioncan be produced.
The production process of aluminum ingots consists of 3 technologic processes, in particular:
- 1. Smelting of aluminum ingots.
- 2. Direct aluminum column casting.
- 3. Soaking of final product.
The very casting process is carried out in the smelting furnace of a continuous cycle, which is a combination of wall and base construction made of qualitative refractory materials and solutions. In the melting furnace the charge (mixture) is loaded which consists of the combination of aluminum ingots and additional materials and alloys providing the necessary composition of the final product. The melting takes place under the temperature of about 750 degrees C and after melting it is transferred into the curing chamber, where it undergoes purifying, mixing and degassing of the alloy.
After that the prepared mixture enters the casting machine, where it is converted into aluminum columns. The resulting poles during the day undergo a process of soaking. At this stage, the elimination of microscopic inhomogenuities formed earlier as a result of fusion of the original aluminum and its supplements takes place, which provides a more uniform and therefore, more robust structure of the ingot.