METHOD OF ALUMINOTHERMIC REFINING OF DUST-LIKE ZINC DROSS FRACTION

• Main Authors: CHERNOVA L.A, SHARSHIN V.N, SKITOVICH S.V, TRIKHAEV S.V, KECHIN V.A
• Format: Patent
• Language: English
• Published: 10.06.2000
• Edition: 7
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

nonferrous metallurgy. SUBSTANCE: aluminum is melted in melting unit crucible at aluminum-to-dross ratio 1:(4-5), after which flux with melting point by 210-280 C superior to melting point of zinc is scattered (poured) onto its surface to form a layer with height 0.2-0.3 that of crucible height. Introduction of dust-like zinc dross fraction is accomplished by admixing it to flux at 720-760 C. As working space of crucible is filled with metal and flux melts, temperature is lowered to 430-500 C and the total is allowed to stand for 0.4 to 12 h. Before settling, a portion of aluminum cuttings is added to flux in quantity corresponding to 1-3% of the metal melt weight in order to reduce residual zinc in flux. EFFECT: increased yield of valuable product at lower cost. 3 cl, 1 tbl