What Is a Rotary Furnace for Melting Aluminum?


Rotary melting furnaces are cylindrical furnaces with two holes in both ends, which are used for melting non-ferrous metals. These furnaces are also suitable for metals such as cast iron, lead, zinc, and copper. If the melting temperature of the metals is close to each other, a rotary furnace can be used for them. However, aluminum has a different rotary furnace due to its characteristics. Aluminum rotary melting furnace is mainly used for recycled aluminum, from which high productivity can be obtained.

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Aluminum Melting Furnace Structure

According to an expert providing furnace installation near Toronto, aluminum rotary melting furnace is made of several layers. The outer layer is made of steel, and the inner layer is made of alumina and silica, which are resistant to heat. These layers have a large diameter and cause the inner and outer diameter of the furnace to be different.

The aluminum rotary furnace consists of three parts: slow melting layer, combustion, and melting. The slow melting layer in other furnaces, such as lead and copper, is made of refractory bricks. But the combustion and melting parts are the same in all furnaces. In the combustion section, oxygen gas and fuel react together and produce heat. This heat causes the aluminum to melt in the lower part of the furnace. The advantage of the aluminum rotary furnace is the smooth and regular movement of the furnace, which makes all raw materials melt well.

Aluminum rotary melting furnaces rotate at a speed of 1.1 meters per minute. The melting time of aluminum in these furnaces is determined based on experience, but 4 to 5 hours can be predicted for them with calculations. The furnace is open at the end, which removes the gases from combustion and melting.

Energy Consumption in an Aluminum Rotary Furnace

Industrial smelting furnaces, like iron smelting furnaces, consume a lot of energy, which is more of a problem in induction furnaces and crucibles with a small volume and high energy consumption, making factories look for energy optimization. In general, the volume of induction and crucible furnaces cannot be very high, and because the furnace is fixed, it takes a long time to melt all the materials.

This problem and the optimization of energy and time have been solved using a rotary kiln. Firstly, the capacity of the rotary kiln is high, and it can be made in large dimensions. Also, the refractory layer inside the aluminum rotary furnace reduces energy consumption. In this way, the slow melting layer can keep the heat in itself, and when it comes in contact with the molten material, it can transfer its heat to this material. This action prevents heat loss in the space inside the oven.

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Classification of Aluminum Melting Furnaces

Aluminum furnace is divided into three groups based on the type of use:

  • Furnaces that recycle and melt waste
  • Furnaces that make alloys from different metals
  • Furnaces that prepare molten metal for casting.

What Are the Types of Metal Melting Furnaces?

The iron and steel melting furnaces used in most factories are Bush furnaces, cupolas, induction, and electric furnaces. Each of these furnaces has its own technology, making it suitable for different conditions and production capacities.