Abstract:
A method and an apparatus for the production of a melt (42) from minerals and/or raw materials preferably for mineral wool. The method is performed in a process furnace (10, 26) that at a first place is equipped with an adjustable feed opening (24) for the lumped raw material (18) and at a second place (26) with an inlet opening for a process gas that is heated by a plasma in a plasma generator (32) to a high temperature. A mixing chamber (38) is arranged to receive the process gas before it is let into the furnace. To the mixing chamber (38) a number of feed devices (45, 46, 48) are conducted and through which a fine particle fraction of the material, solid fuel resp. waste material can be introduced into the mixing chamber. Further there is a recirculation pipe (50) for the recovery of process exhaust gases from the upper part of the process furnace (16) to the plasma generator (32).
Abstract:
An apparatus and method of operating the apparatus, wherein a waste feed material is vitrified for subsequent use or disposal, particularly for disposal of hazardous or noxious waste material which can be difficult or expensive to dispose of. The apparatus copmrises a melt zone constructed in an apparatus above ground (200, 217, 214, 216) and the melt zone lined with a backfill material (226) if refractory properties are needed. The feed material is fed (218) into the melt zone through a cover (216) and, if necessary combusted to an ash, whereupon the heat of combustion is used to melt the ash to a molten condition. Electrodes (220) may be used to maintain the molten feed material in a molten condition, and to maintain homogeneity of the molten materials. The molten material is withdrawn, e.g. via a weir (222) cooled or quenched and then disposed of or further processed (224).
Abstract:
Proposed is a reactor (1) for smelting combustion residues, the reactor having a vertical dividing wall (4) with return-flow openings (7) and an overflow (6). Foamed slag is produced in a chamber (3) by blowing gases in through floor-mounted nozzles (10) and the foamed slag collapsed in a second chamber (5) or in the return-flow channel. After the required degree of transformation, the fluid slag is discharged through the slag run-off outlet (11).
Abstract:
The method, from a base material with an important amount of combustible material, to which there may be added additives, comprises the use as a base material of ordinary wastes (refuse), industrial wastes, evacuation slurries from the preparation of paper, channel slurries, coil and/or oil residues. Optionally and prior to gazeification, the product from the combustion of agricultural and/or industrial wastes in a boiler may be used, and use is made of the gaseous product from the uncombustible fusion obtained from 1100 to 1500 C during one to four hours. Additions before and/or during the formation of the uncombustible residue from the base material are effected in a manner known per se. In the case where use is made of coal alone as base material, at least a portion is added before and/or during the formation of the uncombustible residue of the base material. When implementing such method, there is obtained a relatively low temperature of the melted and castable material as well as an important quantity of the combustible material thus allowing to procede to the melting and casting at a lower temperature hence resulting in a corresponding energy saving.