초록 ▼

In a method for processing solid residues from refuse incineration plants the slag is melted and heavy metals from the melt (16) are separated for reutilization. The slag is directly transferred from the refuse incineration plant into a first heating chamber (2) and melted there under oxidizing cond

In a method for processing solid residues from refuse incineration plants the slag is melted and heavy metals from the melt (16) are separated for reutilization. The slag is directly transferred from the refuse incineration plant into a first heating chamber (2) and melted there under oxidizing conditions. The melt (16) produced therefrom is transferred to a second heating chamber (3), in which the heavy metal compounds are reduced to their metallic form. Furthermore, additional finely divided residues, such as fly ash, boiler ash and filter dust, are introduced into the second heating chamber (3) via a hollow graphite electrode (19). The melt (16) is then passed on to a third heating chamber (4), in which the residual readily volatile metals are vaporized and the residual non-volatile metals are sedimented. The essentially heavy-metal-free melt is then cooled to form vitreous granules.

대표청구항 ▼

[ We claim:] [1.] Method for processing solid residues from a refuse incineration plant, wherein the solid residues contain a slag and heavy metals, comprising:(a) transferring the solid residues into a first heating chamber having oxidizing conditions and melting the residues to a melt wherein at l

[ We claim:] [1.] Method for processing solid residues from a refuse incineration plant, wherein the solid residues contain a slag and heavy metals, comprising:(a) transferring the solid residues into a first heating chamber having oxidizing conditions and melting the residues to a melt wherein at least a part of the residues are oxidized;(b) transferring the melt into a second heating chamber having reducing conditions and reducing the melt wherein at least a part of the oxidized residues are oxidized heavy metals and are reduced to metallic heavy metals;(c) transferring the melt into a third heating chamber wherein the metallic heavy metals are sedimented in the second heating chamber and the third heating chamber;(d) removing the sedimented metallic heavy metals from the second heating chamber and the third heating chamber; and(e) removing the melt from the third heating chamber. [13.] An apparatus, comprisinga first heating chamber having a heating device,a second, electrically heatable heating chamber, anda third, electrically heatable heating chamber,wherein the first and the second heating chambers are connected to one another via a first throat, and the second and the third heating chambers are connected to one another via a second throat,wherein said first heating chamber comprises an upper furnace in an upper area of said first heating chamber, the upper area of said first heating chamber being with respect to an interface between a metal melt and a vapor phase within the apparatus, wherein said upper furnace of said first heating chamber comprises at least one downwards pointing oxygen burner,wherein the second heating chamber comprises a tapping port for removing said metal melt in a lower area of the second heating chamber, the lower area of said second heating chamber being with respect to an interface between said metal melt and a vapor phase within the apparatus, andwherein the third heating chamber comprises aside outlet for removing an essentially heavy-metal-free melt. Apparatus according to claim 10, further comprising a collection shaft for a heavy metal melt in a lower area of said first heating chamber, the lower area of said first heating chamber being with respect to an interface between said metal melt and a vapor phase within the apparatus. The apparatus according to claim 14, wherein said first heating chamber comprises at least one oxygen feed element within said collection shaft. Apparatus according to claim 13, characterized in that the second heating chamber comprises an upper furnace in an upper area of said second heating chamber, the upper area of said second heating chamber being with respect to an interface between said metal melt and a vapor phase within the apparatus,wherein said upper furnace in said second heating chamber comprises at least one heating electrode that projects from said upper furnace into said melt. Apparatus according to claim 16, characterized in that said at least one heating electrode is a graphite electrode. Apparatus according to claim 16, characterized in that a closed conveyor screw opens into the second heating chamber and is gas-tight. Apparatus according to claim 10, characterized in that said heating electrode is a hollow cylinder and forms a feed duct for introducing finely divided residues.