During flotation, what is added to help create froth?

In flotation processes, particularly in mining and mineral processing, the creation of froth is essential for the separation of valuable minerals from unwanted materials. The correct answer indicates that air and chemical flotation agents are added to facilitate this process.

Air is introduced into the mixture, which helps to create bubbles. These bubbles attach themselves to the hydrophobic particles—particles that resist water—and bring them to the surface, forming a froth layer. This froth, which contains the desired materials, can then be removed and processed further.

Chemical flotation agents, often referred to as collectors, are added to selectively alter the surface properties of the minerals. By enhancing the hydrophobic qualities of specific particles, these agents increase the efficiency of froth formation and the overall effectiveness of the separation process.

In contrast, while solid particulate matter can be part of the mixture, it does not contribute to froth creation in the same way that air and chemicals do. High temperatures can affect the properties of the substances being processed but are typically not a standard method for froth generation. Electric currents are used in various electrochemical processes but are not relevant to the basic mechanics of flotation froth formation.