Recovery of noble metal, especially gold, from production residue, e.g. sludge, dross or polishing dust, involves dissolution in aqueous thiocyanate solution by adding strong oxidant, e.g. sodium peroxydisulfate or peroxide

摘要

In the recovery of noble metal (I) from production residue (II) with a process stage in which (I) present in (II) are transferred in ionic form into an aqueous solution containing active reagents for this, the active reagents are thiocyanate and strong oxidant(s).