Which type of furnace is specifically used for melting non-ferrous metals?

The crucible furnace is specifically designed for melting non-ferrous metals, making it the correct answer. This type of furnace utilizes a ceramic or metal crucible that can withstand high temperatures, allowing various non-ferrous materials such as aluminum, copper, and brass to be melted efficiently.

Crucible furnaces are particularly advantageous for small-scale operations or when dealing with specific alloy compositions because they offer excellent temperature control and minimize contamination of the molten metal. The capability to achieve high temperatures and maintain consistent heating is crucial for the precise melting of non-ferrous metals, which often have lower melting points than ferrous metals.

In contrast, the cupola furnace is generally used for melting cast iron and not specifically designed for non-ferrous metals. The induction furnace, although versatile and capable of melting non-ferrous metals as well, is typically associated with higher operational costs and complexity. The tempering furnace is utilized for heat treating steel and does not serve the purpose of melting metals at all. Thus, the crucible furnace stands out as the most suitable option for melting non-ferrous materials.