Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1993-05-12
1995-04-11
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
588201, C21B 1100
Patent
active
054054290
ABSTRACT:
In the processing of mainly inorganic refuse incineration products polluted by heavy metals and/or heavy metal compounds, and/or analogues of such products, to give environmentally acceptable products by melt-thermal treatment, an iron-containing melt is used whose iron content can be adjusted by addition of iron or an iron compound. The melt is first melted above 1300.degree. C. in a reactor. The melt is then oxidized with vigorous agitation by blowing in oxygen-containing gas until all the metals and metal compounds present in the reactor have been converted to the oxide form, the melt being kept above 1450.degree. C. and preferably at about 1500.degree. C., at least at the end of the oxidation. Subsequently, the melt is reduced, preferably by means of a part fraction of the refuse incineration product and/or iron, preferably in the form of scrap, and/or hydrogen. The reduction can then be continued by means of added aluminum and/or calcium and/or ferrosilicon. If appropriate, metal melt is fractionated in a lower part of the reactor and slag melt is separately collected as a supernatant layer. Heating energy can be saved by heat exchange and recirculation of fluid.
REFERENCES:
patent: 3779182 (1973-12-01), Camacho
J. J. J. M. Goumans et al., "Waste Materials in Construction"; Proceedings of the International Conference on Environmental Implications of Construction with Waste Materials, 1991, Elsevier, Amsterdam, NL; pp. 513-522.
Edlinger Alfred
Rey Theo
"Holderbank" Financiere Glarus AG
Andrews Melvyn J.
Hildebrand C.
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