PROCEDURE FOR EXTRACTION OF BRASS, ZINC OXIDE AND COPPER OXIDE FROM SLAG OF BRASS FOUNDRY Russian patent published in 2011 - IPC C22B19/34 C22B13/00 C04B5/00 

FIELD: metallurgy.

SUBSTANCE: procedure consists in preliminary crumbling slag, in its mechanical purification from compounds of iron and in skimming oxide films of brass off it. There is prepared solution containing solution of ammonia salt and surface active substance; solution is then heated to temperature close to boiling temperature. Further there is prepared water suspension by supplying slag into prepared solution with continuous mixing and maintaining said temperature; produced suspension is heated above 101°C at continuous mixing during 15-22 min to purify particles of brass from oxides. Fine dispersed brass is separated; left solution is separated from zinc oxide and copper oxide by mixing during 35-45 min and cooled; by filtering copper oxide and crystallisation of zinc oxide they are separated in cooled solution; the solution is washed with cold flushing water of temperature below 10-24°C to stop chemical reactions. Further, undesirable impurities are turned into solution by washing with hot flushing water at temperature close to boiling; and zinc oxide is separated by filtering.

EFFECT: continuous waste-less production of brass, zinc oxide and copper oxide at reduced expenditures.

5 cl, 1 dwg