Purification of waste waters charged with metal salts, especially heavy metal salts, by treating with magnetic adsorption agent, e.g. magnetic fly ash, then separating adsorbent using magnetic field

摘要

Purification of waste waters charged with metal salts (I) involves mixing the waste water with a magnetic adsorption agent (A), then separating (A) (plus the adsorbed (I)) from the water using a magnetic field. An Independent claim is included for inorganic magnetic adsorption agents (A') containing magnetic particles.