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US 5,108,496 AGranted
Method for the concentration of dusts in a cupola furnace with metal particles
AssigneeGeorg Fischer Aktiengesellschaft
InventorsKarl Gut, Rolf Rietzscher, Hans-Ludwig Roes, Ivo Henych
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Abstract
A process for the econimic recovery of metallic fractions generated during operation of a cupola furnace comprises the steps of the separating filter dust containing metal fractions from an off-gas stream and recirculating the metal fraction back to the cupola furnace for combustion with additional feedstock so as to enrich the metallic concentration of the filter dust to a level where economic recovery of the metallic fraction can occur.
Claims3
A process for the economic recovery of metallic fractions generated during operation of a cupola furnace comprising:
- a) feeding a metallic furnace feedstock to a cupola furnace;
- b) combusting said metallic furnace feedstock in said furnace so as to produce an off-gas stream;
- c) passing said off-gas stream to a filter means downstream of said furnace;
- d) filtering said off-gas stream in said filter means so as to separate filter dust having a metal fraction concentration from said off-gases;
- e) recycling said separated filter dust having said metal fraction concentration to said furnace for combustion with said metallic furnace feedstock so as to produce a gas stream having a dust enriched in metal fraction concentration;
- f) separating said filter dust having an enriched metal concentration from said gas stream;
- g) repeating steps (e) and (f) so as to further enrich the metal concentration in said filter;
- and
- h) thereafter recovering said metal from said filter dust.
6 more elements
Dependencies are inferred from the claim text.