Patent ID: 9700867
Date: 2017-07-11
CPC Classifications: B01J,G11B

Claim:
1. A method for chemical destroying of magnetic data carriers, wherein the magnetic data carriers comprising aluminium or its alloys and ferromagnetic materials are subjected to a digestion reaction in a reactor with an aqueous solution of a digesting mixture that comprises: a) hydrochloric acid and (V)nitrate of one or more alkali metals, alkaline earth metals, rare earth metals and/or ammonium; or b) nitric(V) acid and chloride of one or more alkali metals, alkaline earth metals, rare earth metals and/or ammonium; the product of the digestion reaction is an aqueous solution comprising aluminium hydroxide and chlorides and (V)nitrates of metals contained in the ferromagnetic materials as well as gaseous products of the reaction, whereas the magnetic data carriers, before being subjected to the digestion reaction, are fragmented into stripes with a width of 0.1 to 5 mm.