Abstract: In a process for vitrifying heavy-metal-containing residues having a chlorine content above 10% by mass, in particular from flue gas cleaning, which are melted in a melting furnace, the constituents which cannot be incorporated into the melt are separated in the main furnace into two fractions, the first fraction comprising the readily volatile components and the second fraction comprising the salt-like less volatile components, and the first fraction is evaporated off, conducted out of the furnace together with the exhaust gas and collected as condensate, and the second fraction is separated from the surface of the melt as liquid salt and is discharged.

Abstract: An apparatus for vitrifying heavy-metal-containing residues having a chlorine content above 10% by mass, in particular from flue gas cleaning, which are melted in a melting furnace, the constituents which cannot be incorporated into the melt are separated in the main furnace into two fractions, the first fraction comprising the readily volatile components and the second fraction comprising the salt-like less volatile components, and the first fraction is evaporated off, conducted out of the furnace together with the exhaust gas and collected as condensate, and the second fraction is separated from the surface of the melt as liquid salt and is discharged.

Abstract: A melting furnace for the thermal treatment of special waste materials containing heavy metal and dioxin is provided. The melting furnace includes a main furnace vessel, the main furnace vessel having a melting end for receiving a melt, and a gas chamber above the melt. The melting furnace further includes at least one charging device for supplying a product to be treated, at least one gas outlet, and at least one discharge chamber, the at least one discharge chamber being separated from the main furnace vessel by a separating wall and being connected to the melting end by a siphon, the at least one discharge chamber having a gas chamber above the melt. At least one first heater projects into an interior of the main furnace vessel, and at least one second heater is provided in the at least one discharge chamber.

Abstract: To vitrify chlorine-containing residues from flue gas cleaning, in particular filter dust and residues from the flue gas scrubber, the residues are melted in a melting furnace (8) and then discharged. To condition the melt, alkali-containing fluxes are added in the form of an oxide, hydroxide or carbonate, the stoichiometric ratio between the total alkalis and the chlorine being greater than 0.75, preferably greater than 1. Particularly suitable compounds in this process are oxides, hydroxides or carbonates of sodium or of potassium, or a mixture of such substances.

Abstract: A high-power radiator for UV light comprises a quartz tube or glass tube (1) with electrodes (3, 4), which are arranged in pairs and are separated from one another in the circumferential direction. Together with the electrodes, the tube is partially embedded in a molding compound (2), and forms a module (6). A plurality of these modules can be assembled to form arbitrary radiator geometries.

Abstract: In an ozone generator of modular design, glass tubes (3) are installed, tightly packed, in a housing (2) and cast therein by a casting compound (4) of good thermal and/or electric conductivity. Double helixes (5) of steel wire are placed in the glass tubes. Only the spaces between the tube inside wall and the steel wires act as discharge spaces (6).

Abstract: In an ozone generator with enamel dielectric, to increase the ozone yield, the latter is built up on at least two enamel layers, the layer (4) facing the discharge space (5) having a smaller dielectric constant (.ltoreq.6) than the layer (3) lying underneath.

Abstract: In order to enhance the efficiency of an ozone generator it is proposed that its outer electrodes (1,2) are formed essentially as metal plates arranged and separated from one another in pairs, between which a tube (3) or a layer of closely-spaced tubes (3) with a diameter corresponding to the separation of the metal plates lies. The tubes (3) have an outer coating of dielectric material, or themselves consist of such, and possess in each case an inner electrode (4) of an electrically conductive material.Despite a comparatively inhomogeneous discharge gap (6), such an ozone generator has a high efficiency of ozone generation because the heat arising in the discharge space can be dissipated optimally.