How is sulfur dioxide (SO2) formed in a mining environment?

The formation of sulfur dioxide (SO2) in a mining environment primarily occurs through the burning of coal that contains pyrites. Pyrites, also known as iron disulfide (FeS2), are commonly found in coal deposits. When coal is burned, the sulfur contained in the pyrite reacts with oxygen to form sulfur dioxide. This process is significant in mining operations, especially in areas where coal is mined and burnt for energy, as it can lead to the release of sulfur dioxide, contributing to air pollution and acid rain.

Other processes such as the combustion of pure sulfur or burning natural gas do produce sulfur dioxide as well, but they are not typical sources within the context of a mining environment. Additionally, the reaction of sulfuric acid does not generate sulfur dioxide; rather, it may involve different reactions depending on the context. Thus, the formation of sulfur dioxide through the combustion of coal with pyrites is the most relevant and accurate explanation for its occurrence in mining scenarios.