This book presents biodegradable depressants, delving deep into their performance, intricate structures, and adsorption mechanisms. The book presents diverse minerals and materials where these depressants have been used for their upgrading. Encompassing the entirety of current research, it is an indispensable read for both industry professionals and researchers in the field, especially on courses centered around froth flotation and recycling. From the starch-based solutions in Chapter 1 to the diverse array of gums explored in Chapters 7 to 10, and the intriguing polyaspartate and tripolyphosphate in Chapters 11 and 12 respectively, each section unfolds a rich tapestry of knowledge, providing a holistic understanding of biodegradable depressants and their pivotal role in mineral processing.