DE2121071A1 - Device for carrying out continuous melt-metallurgical reactions in connection with an electromagnetic countercurrent trough and method for operating the device - Google Patents

Description

PATENT LAWYERS
Dipl.-Ing. WERNER COHAUSZ ■ Dipl.-lng. WlLHELM FLORACK. Dipl.-ing. RUDOLF KNAUF

4 Düsseldorf, Schumannstrasse 97

Pried. Krupp. Ironworks April 28, 1971

Aktiengesellschaft

463 ν '

Device for carrying out continuous smelting metallurgy Electromagnetic countercurrent trough reactions and methods of operating the apparatus

The invention relates to an apparatus for performing continuous Smelt metallurgical reactions in connection with an electromagnetic countercurrent trough, the countercurrent trough between the deeper metal inlet or slag outlet and a higher-lying reactor, which is used for feeding the slag phase and / or for prischarging, opposite the countercurrent channel greater bath depth is arranged and a method for operating the device.

It is known that metallurgical reactions on the electromagnetic Countercurrent trough compared to discontinuous or cocurrent processes far lower amounts of slag for the need the same success (Archiv Eisenhüttenwesen 39, 1968, page 421/32; Stahl und Eisen 89, 1969, page 1185/90). How in particular The practical tests carried out on the basis of the theoretical discussions in the work Archive showed are significantly better results can only be achieved with large channel systems

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wait, since on the one hand the proportion of mixing is limited and on the other hand the influence of the start-up period can be eliminated (see Stahl und Eisen, loc. cit., page 190, left column, Paragraph 5).

The space requirements of such large-scale systems are the economic ones Contrary to interests.

It is an object of the invention to be carried out continuously Melt-metallurgical reactions in connection with an electromagnetic counter-current channel, more space-saving channel dimensions to specify.

This object is achieved in that within the total length of the countercurrent channel in a cascade shape at least another reactor is interposed.

The following considerations led to the device according to the invention:

The aforementioned savings in slag when using the The countercurrent process can only refer to additives that are used to remove the undesired accompanying elements in the iietall solve these undesirable accompanying elements in itself. If «tie undesirable Accompanying elements, on the other hand, are chemically bound by a partner, so this is a certain stoichiometric Amount required. This amount can go with the counter flow: p.ve <. · are not reduced, since they are based on the content of the ui undesirablei Accompanying elements in the starting metal is dependent. A lot more, stoichiometrically required reactant in a certain amount is, for example, oxygen or sulfur when refining pig iron when setting copper to remove it from lead. For the sake of simplicity the invention is hereinafter for the refining of Pig iron described; but it is also used for any other reaction between metal and slag or other phases (stones, dishes, Gas phases) can be used.

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With phosphorus-rich pig iron, which is usually according to the Thomasoder LDAC process is processed, larger amounts of oxygen are required than with low-phosphorus pig iron. Accordingly In the case of pig iron rich in phosphorus, the quantities of slag are also considerably larger. The intermediate slagging in the LDAC process requires a lot of time, a process step that does not occur in the countercurrent process on the electromagnetic countercurrent trough. However, in the device mentioned at the beginning, the stoichiometric to bring the required amount of oxygen to the site of the reaction at the right time and at the same time lower the advantage To maintain slag quantities, it is necessary to add oxygen or ores or both to the total distance of the reacting phase on the countercurrent trough. There is a risk that it would disturb the currents and attack the refractory Lining the countercurrent trough comes.

The device according to the invention avoids these difficulties within the total length of the countercurrent trough in cascade form at least interconnects another reactor. Preferably up to five, but especially three reactors are connected in between.

In a preferred embodiment, the individual sections of the countercurrent trough divided by the reactors are arranged at an angle to one another, the reactors forming the corner point.

In a further preferred embodiment, the countercurrent channel has within their total length openings for the withdrawal or the task of metal and / or slag phase.

Preferably that is used to withdraw the slag phase Opening in each case arranged shortly before the interposed reactor.

Reactors that are used as inflation converters are of particular advantage are trained. Preferably each inflation converter has one

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Capacity for the metal phase, that of an average residence time from 5 to 30 minutes.

The device according to the invention is particularly suitable for a method in which substances which form slag in the reactors (Inorganic compounds in the form of slag, stone, food or the like) and optionally reactive and / or inert Gases are blown in.

Partial amounts of the metal and / or the slag phase are preferred or the entire slag phase is withdrawn within the entire length of the countercurrent trough and in certain amounts after recirculation added again in the manner of a circulating material.

Embodiments of the invention are shown in the figures and are described in more detail below.

Show it:

1 shows a diagram of the device according to the invention

an intermediate reactor;

FIG. 2 shows a diagram according to FIG. 1 with two interposed ones Reactors and

Fig. U 3. ■ in the diagram k plan views of preferred arrangements

the device according to the invention.

In FIG. 1, the reactor designed as an inflation converter is denoted by 1. The countercurrent channel 5 * 10 is through another. Inflation converter 2 divided into two sections. The lances 7 * 8 are immersed in the converters I, 2. The metal phase is denoted by 4 and the slag phase by 6. The finished, refined metal is removed from the converter via a siphon or another electromagnetic trough 3 2.

In Fig. ' 2 1st through the interposition of three converters 2, 3,

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the countercurrent trough into four sections. 10, 5, 15, 16 subdivided. A lance 7, 8, 9 is guided into each converter 2, 3, 11.

As Fig. 3 and Fig. 4 show, is in an angled arrangement of the individual subdivided channel sections a particularly space-saving one Arrangement of the device according to the invention given. The inflation converters are located at the corner points of the angled arrangement 1, 2, 3 * 11 * through the channel sections 10, 5> 15 are connected. .

The operation of the device according to the invention is as follows:

As stated at the beginning, for example, is from an economic point of view from the point of view of the continuous processing of Thomas pig iron an interesting task for the iron and steel works. In this case, larger amounts of oxygen must be available for the slagging be asked. In order to bring the oxygen to the place of the reaction at the right time and at the same time reduce the advantage To maintain slag levels, it would be necessary in the known art to add oxygen and ore or both to the To give gutter. There is a risk that the already thin layer of liquid pig iron of about 1 to 3 cm will pierce becomes, so that it comes to disturbances of the currents and the attack of the refractory material. To get these difficulties out of the To go ways, one or, if necessary, several converters 2, 3, 11 are interposed in the method according to the invention, in to which most of the gaseous oxygen is inflated and ore and lime are added. This also has the advantage that on these places metal and slag are intensely swirled together.

In Fig. 1 is shown a two-stage device. Oxygen, lime, ore and possibly other additives are stored in converter 1 given up. The steel is refined in the converter 1 itself. In the upper channel section 5, the slag performs oxidation work,

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where it loses some of its iron oxides. In the intermediary Converter 2, the oxygen potential is raised again by oxygen bubbles and ore addition. Here is the iron too strongly refreshed. On the lower channel section 10, the slag again loses its oxygen potential as a result of the slag running off Fresh reactions.

As Fig. 3 shows, are also in the individual channel sections 10, 5 * 15 openings 14, 15 provided for pulling off a Part or all of the slag from the upstream channel reaction section are intended. These slags can be added again in the area of the higher converter (arrows), at the same time a new or only partially new slag is generated in the respective converter.

As FIG. 4 shows, through openings 16, 17 in individual Channel sections are also branched off partial amounts of metal. Depending on their concentrations, these metal sub-quantities can be the desired finished metal, or they can be in lower lying converters (arrows) to dilute the metal located there be admitted.

After the intensive swirling of slag and metal in the converter and the associated intense reaction between slag and metal leaves the emulsion-like mixture of slag and a part of the metal the converter and reacts on the gutter welter.

The meball droplets sink from the slag into the uphill flowing Metal stream into it, whereby they have previously reacted with the iron oxide and the oxygen of the slag.

The particular advantages of the invention are:

that the total length of the countercurrent channel is greatly reduced,

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that the space requirement is reduced by an angled arrangement of the individual channel sections

and that the wear and tear of the refractory material is lower, since the highest temperatures occur in the reactors (converters), It must be taken into account that in the reactors, in addition to a greater bath depth, the distance to those subject to wear Sidewalls is larger.

Patent claims:

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Claims (9)

Patent claims 1. Device for carrying out continuous smelting metallurgy Reactions in connection with an electromagnetic countercurrent trough, with the countercurrent trough between the deeper lying metal inlet, or, Schiacken outlet and a higher located, for abandoning the slag phase and / or serving for Prischen reactor with compared to the countercurrent trough larger Bath depth is arranged, characterized in that within the total length of the countercurrent channel (5 * 10) at least one further Reactor (2) is interposed. 2. Apparatus according to claim 1, characterized in that up to to five, preferably three reactors (2, 3 * H) interposed are. 3. Apparatus according to claim 1 or 2, characterized in that the individual sections (5, 10) of the countercurrent channel divided by the reactors (2, 3, 11) are arranged at an angle to one another are, with the reactors (2, 3 * Π) forming the corner points. 4. Device according to one of claims 1 to 3 * characterized in that that the countercurrent channel (5> 10) within its total length openings (13, 14) for the withdrawal or the task of Has metal and / or slag phase. 5. Apparatus according to claim 4, characterized in that the opening (14, 13) serving to withdraw the tube phase is arranged shortly before the interposed reactor (11, 18). 6. Device according to one of claims 1 to 5 * characterized * that the reactors (1 * 2 _S 3 * H) are designed as inflation converters. 7. Apparatus according to claim 6, characterized in that each 209847/0250 Inflation converter (1, 2, 3 * H) a capacity for the Has metal phase, which corresponds to an average residence time of 5 to JX) min. 8. A method for operating the device according to one of the claims 1 to 7, characterized in that slag-forming substances (inorganic compounds in the form of slag, stone, food or the like. ) and if necessary reacting and / or inert gases are blown in. 9. The method according to claim 8, characterized in that subsets the metal and / or slag phase or the entire slag phase within the total length of the countercurrent trough withdrawn and added again in certain amounts after recycling in the manner of a circulating material. 9 Π Q fi /, 7 / η 9 ς η