What is phosphorus in coal generally considered?

Phosphorus in coal is generally considered an undesirable element even in small quantities. This is primarily because phosphorus can lead to several negative effects during the combustion process and the subsequent handling of the byproducts. When coal containing phosphorus is burned, it can form ash that has a higher fluidity at lower temperatures, which can cause operational issues in furnaces and boilers. Additionally, phosphorus can contribute to the formation of pollutants such as phosphorus oxides, which are harmful to the environment.

The presence of phosphorus in coal may also affect the quality of energy produced, leading to inefficiencies in power generation. Therefore, while some minerals in coal can be beneficial for burning, phosphorus is typically viewed as a nuisance that should be minimized in coal supply. Understanding these implications helps in evaluating coal quality and making informed decisions about its use in energy production.