Holderbank Financiere Glarus Ag

Von Roll Umwelttechnik Ag

Theo Rey

Alfred Edlinger

Hans Ruegg

Ruedi Frey

Norbert Kiethe

Anton Mayer

Ernst Hugentobler

Karl Heinz Pflugl

Karl-Heinz Pflugl

Process and apparatus for the 3-stage treatment of solid residues from

A process for the treatment of solid residue from a refuse incineration plant, involving:

Process for the treatment of solid residue from refuse incineration

In a process for the preparation of cement from metallurgical slags, in which liquid slags from reduction processes and steelworks processes, e.g. blast furnace and converter slag, are mixed together and mixed with lime the procedure is such that in a first cooling phase at temperatures above 1000.degree. C., and preferably above 1200.degree. C., the cooling is slower than in a subsequent second cooling phase and that the solidified product obtained is granulated and/or ground in order to obtain directly cement with improved hydraulic properties, in particular increased final strength.

Process for producing cement from metallurgical slag

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.

Method for treatment and conversion of refuse incineration residues into

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Aarau, Switzerland

Theo Rey