What is cupola furnace?

A cupola furnace is a tall, cylindrical furnace used for melting scrap metal and producing cast iron and steel. It is a traditional method of melting metal that has been used for centuries in foundries.

The cupola furnace is made of a steel shell lined with refractory material, and it is mounted on a concrete base. It typically ranges in height from 3 to 10 meters and has a diameter of 1 to 3 meters.

The furnace works by burning coke (a form of carbon) as fuel, which generates intense heat. The metal scrap is loaded into the top of the furnace, along with limestone and other fluxing agents to help remove impurities. As the metal melts, it collects at the bottom of the furnace and is tapped out through a tap hole at regular intervals.

Cupola furnaces are known for their high melting rates and energy efficiency, making them popular for small to medium-sized foundries. However, they can be noisy, dirty, and produce a lot of emissions, so they are not as commonly used in modern industrial settings.

Overall, cupola furnaces are a cost-effective and versatile method of melting metal for casting, but they require careful maintenance and operation to ensure safety and efficiency.