Amphoteric polyacrylamide contains cationic and anionic groups in its molecule. It possesses the characteristics of common cationic flocculants and exhibits more excellent properties. Such flocculants can be used in a wide range of PH values, with higher water filtration capacity, lower cake moisture content, and can also be used for strong acid leaching of ores or recovering valuable metals from acidic catalysts containing metals. Amphoteric polyacrylamide is by no means a mixture of anionic and cationic polyacrylamide.