ANS:B - Xanthaies

It seems there might be a typographical error in the term "Xanthaies." It's possible that you meant "xanthates," which are indeed used as frothers in froth flotation processes for ore beneficiation. Xanthates are chemical compounds derived from xanthic acid and are commonly used as collectors in mineral processing. They have the ability to selectively float certain minerals by forming hydrophobic complexes with them, which allows them to be carried to the surface of the flotation cell in the form of a froth. In the context of froth flotation, xanthates act as surfactants, reducing the surface tension of the water and promoting the formation and stability of air bubbles in the flotation cell. This aids in the attachment of mineral particles to the bubbles, enabling their separation from the aqueous phase during the flotation process.