A foundry typically burns various types of fuel to melt and refine metals. The primary fuels used in foundries include coal, natural gas, and oil. Coal is the most common fuel due to its high energy content and availability in many regions. Natural gas is favored for its efficiency and lower emissions compared to coal. Oil is used in some foundries, particularly for smaller operations or when other fuels are not readily available.

The choice of fuel in a foundry depends on several factors, including cost, availability, and environmental regulations. For instance, natural gas is often preferred in areas where it is abundant and environmentally friendly. Coal, on the other hand, is more commonly used in regions where it is readily available and cost-effective. The type of fuel also influences the efficiency and emissions profile of the foundry.

According to the U.S. Energy Information Administration (EIA), coal accounted for about 70% of the energy used in U.S. foundries in 2020. Natural gas accounted for approximately 25%, while oil made up the remaining 5%. These figures highlight the significant role of coal in the foundry industry, although the trend is shifting towards cleaner fuels like natural gas due to environmental concerns and technological advancements.

The shift towards cleaner fuels is driven by the need to reduce greenhouse gas emissions and comply with environmental regulations. For example, the U.S. Environmental Protection Agency (EPA) has implemented regulations that limit emissions from industrial facilities, including foundries. As a result, many foundries are investing in technologies that allow them to use cleaner fuels or improve their energy efficiency.

In conclusion, foundries in the United States typically burn coal, natural gas, and oil as fuels for melting and refining metals. The choice of fuel depends on factors such as cost, availability, and environmental regulations. The trend is shifting towards cleaner fuels like natural gas due to environmental concerns and technological advancements.