FI66912B - FOER REFRIGERATION CONTAINER REFINING COVER FOR WHEEL FREES - Google Patents

Description

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FINLAND - FINLAND (21) NMMtUiikemMi —P * «** wöknli» | 761 m9 (22) HtlMBil ^ Ovt — AmBkn1m »d» | 20.05.76 (23) AMmHM — GIMgM «ta | 20.05.76 (41) Τ «Μκ |« ΜΜΐαΙ —23.11.76.

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Federal Republic of Germany-Förbundsrepubli ken Tyskland (DE) P 2522662.A Proof-Styrkt (71) K1öckner-Humboldt-Deutz Aktiengesellschaft, Deutz-Mulheimer-Str. Ill, 5 Köln 80, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Wolfgang Wuth, Berlin, Horst Wiegel, Cologne, Gerhard Melcher, Cologne,

The present invention relates to a process for the continuous refining of molten copper to a process for the continuous refinery through reduction and oxidation zones, where it reacts with gases and thereby releases contaminants, and wherein fuel and oxygen-containing primary gas are introduced into said reduction zone as a countercurrent to the molten copper stream in a substoichiometric ratio. , wherein this secondary gas is first contacted with said molten copper as a reaction stream before coming into contact with said unburned fuel.

The technical and economic progress brought about by this method stimulates the method specifically for continuous improvement by means of optimization towards fully automatic control of the process. However, this even more far-reaching improvement in the copper refining process has hitherto been hampered by difficulties in accurately and at least quantitatively controlling heat and mass transfer events in the reaction mechanism between the gas phase and the metal melt.

6691 2

In order to control the reaction mechanisms in a quantitative manner in this way, it is necessary to establish and maintain reproducible, but in any case forced, convection and mass transfer relationships between the reaction gas and the molten copper / slag phase.

The object of the present invention is to improve the above-mentioned copper refining process according to German patent 2,061,388 by means of both qualitatively and quantitatively controllable reaction events.

This is achieved according to the invention by blowing said second gas approximately perpendicularly as a centered high power powerful jet of metal bath jet slag to expose a clear surface through an acceleration nozzle which provides a concave fast and controllable mass transfer.

In this case, the gas jet 21 is brought into contact with the metal bath 11 by forced displacement of the floating slag layer 12 in a forced and adjustable current density, whereby the conveying field of the molten metal 11 forcibly generated at the dam jet of the gas jet 21 is quite fast and thus controllable.

The secondary gas is blown as a jet so strong that the layered flow 2 of the rotating melt 24 of the puff depression 24 located at the dam point 26 of the jet 21 is substantially tubular. together with the gas jet 21 results in a reaction unit with a predetermined mass transfer, limited by the convection conditions of the system.

These measures result in optimal, predictable, particularly fast reaction events which, due to their prescribed power according to the forced order of magnitude, are suitable for method-saving measures.

Since the reaction between the molten copper and the reaction gases now substantially takes place in the region of the indentation point in the bath caused by the gas entrapment, and the surface area of this indentation point is measurable and thus adjustable and determinable, it is possible to quantitatively control the transfer conditions. Here is another advantage of the invention compared to the prior art, namely the possibility of programmably controlling the refining process of copper. In order to prevent disturbances, which could occur, for example, due to excessive movements of the bath, care must be taken to ensure that the bath does not enter the splashing space. In this case, firstly, you will see the adjusted equilibrium of the reaction and thus the controlled situation would be disturbed, and secondly, at least locally, excessive oxidation could occur, so that copper oxide is formed. Both of these disorders are harmful.

The last step of the method according to the invention is thus that the jet force and the distance of the nozzle opening (25) from the bath surface (11) are adjusted according to the nature of the reaction gases used so that the metal bath does not explode.

Other details, features and advantages of the invention will be explained in more detail below with reference to the accompanying drawing, which shows a furnace apparatus used for the continuous refining of contaminated copper.

Figure 1 shows a section of a raffin furnace for carrying out the method according to the invention.

Figure 2 shows a perspective view of the mouthpiece of the nozzle tube and the gas jet flowing therefrom, which is directed to the copper melt bath below and its slag layer.

Figure 1 shows a rectangular melting furnace 1, which is divided by means of partitions 2, 3> 4 into three pool-like reaction zones 5, 6, 7. The partition wall 2 has a flow-through trough 9 for molten copper. The reaction zone 6 has a bath surface 10, below this a liquid copper bath 11, and above the surface a slag layer 12. The slag 12 is removed from the oxidizing refining reaction zone 6 through an opening 13 in the furnace wall. The liquid in the flow direction of the purified copper fed to the furnace 1 at point 14 and leaving the furnace 1 at point 15 retains a threshold at the outlet end of the slag reaction zone 6. Liquid copper passes this threshold 8 through a flow opening 16 below the bath surface 10. Maintenance operations can be performed through the closable opening 17 in the furnace wall of the reaction zone, and solids, e.g. copper ore concentrate and / or fuel, can also be fed. The exhaust gas leaves the furnace 1 through the flue 19. A burner 36 for heating is arranged in the outlet end wall 18. In use, liquid crude copper is fed to furnace 1 at 14 and / or copper ore concentrate and fuel at 17. The substances to be treated in zone 5 are heated to a suitable processing temperature of “66912” for the next refining. In zone 6, oxygen-containing reaction gas is blown through the nozzle tube 20 as a concentrated high-power gas jet 21 on the surface 10 of the bath of molten flowing copper 11. The blowing and thus jet power is controlled by a throttle valve 22 at the end 23 of the nozzle tube 20. The copper bath 11 surface is in the shape of a concave bowl. The pitting pressure of the reversed gas jet 21 compresses the slag layer 20 to the sides of the copper bath 11 at the edges of the jet. This phenomenon is shown enlarged in Figure 2 as drawn from experimental observations. A nozzle tube orifice 25 is seen from which the gas jet 21 flows and strikes the slag layer 12 on top of the copper bath 11. As the gas jet 21 pans in the deflection region 26, the slag layer 12 is compressed as depression 24, illustrated by lines A-B. The deviated gas flows at 29 to the surrounding space. In contact with the gas jet 21 and moved by this traction and by the buoyancy at the edge of the blown depression 24 of the copper bath 11, a tubular flow zone is created with strong turbulence of the bath, which is represented by vectors 27 indicating the direction of flow.

Figure 1 further shows a second nozzle tube 30 located in the reaction space 7 for blowing the reaction gas into the cup bath. The end 31 of this guide tube 30 has two connections 32 and 33, one of which, i.e. connection 32, is for transport gas and the other connection 33 is for supplying fuel, e.g. diesel oil, natural gas, propane, coal dust, etc. The throttle valves 3 and 35 can be used to control the pressure and thus the current density and power of the gas jet.

Claims (3)

6691 2 5 A process for the continuous refining of molten copper from impurities, wherein the molten copper is passed to flow through the reduction head oxidation zones, where it reacts with gases and is then released from the impurities, and wherein , and the still unburned fuel is introduced into said oxidation zone, where it reacts with an oxygen-containing secondary gas, said secondary gas being first contacted with said molten copper as a reaction stream before coming into contact with said unburned fuel, characterized in that said secondary gas is blown approximately perpendicularly (21) a metal bath (11) from the jet slag (12) to expose the clear to the gas surface (10) via an accelerating fuse (20) which provides a concave blow-shaped blowing press (24) on the surface of the bath and a tubular rotating flow in the bath, whereby a rapid and controllable mass transfer takes place in the convection field. Method according to Claim 1, characterized in that the blowing of the secondary gas is adjustable. Method according to Claim 1 or 2, characterized in that the force of the jet and the distance of the nozzle opening (25) from the bath surface (11) are adjusted according to the nature of the reaction gases used so that the metal bath does not enter the splash state.