An overview of the most actual methods of pyrite ash valorization

Abstract

The obtaining process of sulfuric acid, that involves roasted of pyrite ores, leads to accumulation of a significant amount of secondary matter known as pyrite ash. This waste, that is found worldwide in quantities of millions of tons, it is highlighted by his chemical composition, based on the presence of high concentrations of hematite and magnetite. By implementing worldwide of the concept of circular economy, the use of pyritic ash as an alternative source of iron is a topic of current interest. This study is proposing to present the latest trends in the methods of valorization of pyritic ash that are presented in the specialty literature, which can be implemented in various branches of industry.

Alternative adsorbent materials used to remove phosphates from water

“…Pyritic ashes can also have negative effects for human health, producing cancer, anemia, fatigue or cardiovascular diseases, because they can enter into the human body through inhalation, dermal adsorption or dietary intake [28,29]. Starting from the chemical composition of this waste, research has focused by valorization of this waste through different methods based on the circular economy principles [30]. The most current methods for pyritic ash valorization include: metals recovery [31÷37], chemical lopping combustion [38÷40] or valorization in order to obtain value added products (pigments, catalysts, adsorbent materials) [41÷44].…”