| 摘要 |
<p>A metal (e.g. Ag) may be removed from solution (e.g. photographic fixer) by passing the solution through a packing containing one or more zones (40) of metal, preferably cast iron chips, the metal being lower/more active in the emf series than the metal to be removed. The solution flows from inlet (35) to outlet (36) in a flow path which extends adjacent to zones (40) and preferably extends through an open cell foam (39). A minor portion of the solution is able to permeate from foam (39) into the permeable zone (40).</p> |
