Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1994-01-06
1995-05-02
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75549, 75655, C21C 538
Patent
active
054115728
ABSTRACT:
The invention relates to a method for utilizing zinciferous waste from metal smelters, such as steel smelters, so that the transmission of fluorides to the highly zinciferous secondary dusts is prevented during the treatment of the gas obtained from the waste smelting furnace. Fluorides are extremely harmful for the zinc process, and therefore it is important to prevent them from entering the process. By adjusting, according to the invention, the temperature and composition of the exhaust gases created in the smelting treatment of zinciferous dusts and other waste, the fluorides and the highly zinciferous fraction are obtained in different end products. Other valuable metals are recovered from the metal layer created on the bottom of the furnace.
REFERENCES:
patent: 3769000 (1973-10-01), Glassman
patent: 4741770 (1988-05-01), Andrews
patent: 5139567 (1992-08-01), Matsuoka
Metsarinta Maija-Leena
Tuovinen Frans H.
Outokumpu Research Oy
Rosenberg Peter D.
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