Specialized metallurgical processes – compositions for use therei – Processes – Consolidating metalliferous material by agglomerating,...
Patent
1991-04-02
1992-05-19
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Consolidating metalliferous material by agglomerating,...
65 19, 266157, 423DIG20, C21C 538
Patent
active
051144743
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an arrangement for introducing waste material into a molten slag which occurs in a cupola furnace.
Under the environmental protection decrees, which are becoming ever more stringent, particularly high demands are made on the operation of cupola furnaces.
During the smelting process various metals evaporate in the cupola furnace, which metals are contained in the scrap portion, such as, for example, zinc, cadmium, lead, etc., and may no longer be carried away into the open air on account of pollution abatement regulations of the air, but are caught with the aid of a filter unit.
In particular a method is known by which the dust particles as waste material are introduced into a molten furnace slag such that they are fed underneath the slag surface in the slag overflow with the aid of a worm conveyor and are vitrified.
The disadvantage of this method is above all the fact that as a result of the high scrap content during the smelting process the filter dust contains dangerously high zinc values. As the filter dust is now introduced into the slag in the direct vicinity of the slag overflow, as a result of the high zinc contents the lining is attacked and wears. This results in a changed siphon geometry, this being linked with disadvantages for the cupola furnace operation, as with a non-tight siphon the air blast escapes.
Basing considerations upon this prior art, it is the object of the present invention to put forward an arrangement for introducing waste material into a molten slag which occurs in a cupola furnace, with the aid of which arrangement economical, process-reliable and reproducible waste disposal is possible in order to avoid dumping which loads the environment and gives rise to costs.
SUMMARY OF THE INVENTION
The foregoing object is achieved according to the invention in that there is arranged outside the cupola furnace between the slag overflow and a slag-collecting arrangement at least one reaction vessel in which the addition of the waste material to the slag takes place.
BRIEF DESCRIPTION OF THE DRAWING
A preferred exemplary embodiment of the invention is explained in greater detail with the aid of the Figures.
DETAILED DESCRIPTION
FIG. 1 is a schematic illustration of a first embodiment of the method and device in accordance with the present invention.
FIG. 2 is a schematic illustration of a second embodiment of the method and device in accordance with the present invention.
A cupola furnace, which is not represented in greater detail, has a slag channel 1 in the siphon 2. The slag 4, which flows off from the tapping channel 1, flows off freely and is collected by a reaction vessel 5. The reaction vessel 5 has a pouring-in opening 5a and a discharge opening 5b from which the slag flows off further into a collecting container 7. The dust-like waste material is introduced into the slag present in the reaction vessel 5 with the aid of a worm conveyor 6. The turbulence present in the reaction vessel ensures that there is good mixing. The vitrification occurs in the reaction vessel 5. The slag which flows off through the exit opening 5b is caught in a container 7.
The slag solidifies in the container 7 to form a compact piece. It is also possible to connect on the output side thereof a granulating plant which is operated with water. Dry granulation of the slag can also occur according to FIG. 2. In this connection, the slag 4 is directed onto a plate 9. The slag portions which have sprayed away from the plate 9 are collected by a deflecting plate 8 and deflected and collected in a vessel, which is not shown, as granulated material 10. The plate 9 can also be arranged so that it rotates in the manner of a centrifuge.
1. A method for the economic and environmentally safe disposal of waste material and molten slag from a cupola furnace comprising the steps of: produce a substantially homogeneous mixture of waste material in said slag; and collection container.
2. A method according to claim 1 including feeding molten siphoned sl
REFERENCES:
patent: 1947487 (1934-02-01), Newhouse
patent: 3054139 (1962-09-01), Bartholomew et al.
patent: 4822388 (1989-04-01), Gee
Schmidt Hans
Wilhelm Ludwig
Andrews Melvyn J.
Georg Fischer AG
LandOfFree
Arrangement and method for introducing waste material into a mol does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arrangement and method for introducing waste material into a mol, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arrangement and method for introducing waste material into a mol will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2415432