Verfahren zur Aufbereitung von Schwermetallsalze und Primaerflockungsmittel enthaltenden Wasserschlaemmen
The invention relates to a process for the processing of heavy metal salts and primary flocculating agents containing water slurry, whereby acrylamide oxime acrylhydroxam acid copolymers are used as flocculating agent. The heavy metal salts are first separated and then the flocculating agent can be dissolved from the remaining slurry in known ways. According to the invention, the water slurry is mixed with sulphuric acid to obtain a pH of > 1.3 to < 3.5 at a proportion by volume of sulphuric acid to slurry of 1 : 1 to 2 : 1. It was unexpectedly discovered that the flocculating agent remained undissolved in the slurry whereas the heavy metal ions were agglutinated by the acids and can thus be separated from the slurry. Formula 1.
DE 1990-4020016 A: 19900620