MXPA06002143A - Industrial oven - Google Patents

Abstract

The invention relates to an industrial oven which is used to melt non-ferrous metals and for gas treating non-ferrous metals.

Description

INDUSTRIAL OVEN DESCRIPTION OF THE INVENTION The invention relates to an industrial furnace for melting and treating non-ferrous metals with gas. By the state of the art it. know different types of furnaces for the primary and secondary metallurgical treatment of non-ferrous metals, for example, copper (in this case, for example, to produce anodic copper or blister), lead, zinc, tin, nickel or aluminum or alloys of these. One of these types of kilns is the so-called rotary kiln, which is used in particular to refine (that is, to oxidize and reduce) copper. As another type of furnace is known, for example, the oscillating furnace that is used in particular to melt scrap copper but also to refine the metal broth that is obtained from it. Analogous furnace types are also known for melting, treating and processing other non-ferrous metals. The rotary kilns are used in particular to refine melts of non-ferrous metals in the liquid state which are fed to the rotary kiln from a melting furnace. In part, solid return material is also charged into the furnace. A rotary kiln substantially resembles a steel tube that rotates about its horizontal longitudinal axis and is closed at both ends of its axial sections. In its inner part the tube is covered with a refractory material, so that a circular cylindrical interior space is free. This circular cylindrical inner space forms in its lower part a channel for the non-ferrous metal melt in which the molten mass of non-ferrous metal is treated, that is to say, in particular, for example, refined (oxidized and reduced), alloyed or homogenized. . . This treatment process (i.e., in particular refining, alloying and homogenization) takes place substantially by the fact that gas is injected into the melt from nozzles which are below the bath of the non-ferrous metal melt, the called lower nozzles or from lances that are submerged from above in the melt. Co or gas to oxidize the copper or other non-ferrous metal melt is used in particular oxygen, air or any reactive gas, eg, chlorine gas, with the gas flowing through the mass " molten non-ferrous metal reacts with the foreign substances found in it and either deposits as slag on the surface of the melt as the corresponding reaction product or leaves the unit as a volatile powder or gas lost from the The volatile dust and the gas lost from the process can leave the unit, for example, through the chimney for the combustion gas.To homogenize the molten mass of non-ferrous metal it is possible that in the melt it is injected through of the nozzles, in accumulated or alternative form, an inert gas, for example, nitrogen or argon, being that when flowing through the molten mass of non-ferrous metal the inert gas mixes it and homogenizes it. a molten mass of non-ferrous metal is injected into this a reducing gas, for example, natural gas, LP gas, ammonia, hydrogen or liquid hydrocarbons (oils / diesel). Efficient treatment of the melt can only be carried out if the gas flows for a sufficient period of time through the melt. By virtue of the fact that the time required for the gas to rise from its injection point in the lower part of the melt bath to its surface is substantially defined by the height of the bath, a minimum bath height is required in which it is ensured a sufficient flow time of the gas injected through the bath. In order to drive the non-ferrous metal melt out of the rotary kiln, it has openings through which the molten mass of non-ferrous metal can flow out after having rotated the furnace about its longitudinal axis by such a wide angle of rotation. that allows the molten mass of non-ferrous metal to reach these openings. While rotary kilns are well suited for the previously mentioned treatment of non-ferrous metal melts by gas injection, they are not for melting non-ferrous scrap or solid cargo material. And it is that a fast and efficient melting / dissolution of non-ferrous scrap would only be possible efficiently in the upper regions of the non-ferrous melt bath that are reached by the flames of the burners that flow into the free interior space directly above the - non-ferrous melt bath. However, by virtue of the minimum bath height required, the non-ferrous scrap is immersed at least partially in the melt of non-ferrous metal, so that it is not possible to melt quickly and efficiently, or to dissolve, the total of non-ferrous scrap. Therefore, an additional furnace is preferably required to melt non-ferrous scrap. As a suitable furnace for melting non-ferrous scrap or solid loads, in addition to the shaft furnace, in particular the so-called reverberatory furnace (stationary) or the oscillating (tilting) furnace is used. In the latter, non-ferrous scrap is melted with a comparatively small bath height and a large bath surface of the non-ferrous metal melt. While it is true that by rocking the furnace sufficient refining or other treatment of the non-ferrous metal melt by means of nozzles under the bath is possible, these are relatively inefficient by virtue of the low height of the bath. To conduct the non-ferrous metal melt out of the oscillating furnace, it can oscillate by a few degrees of angle. The object of the invention is to provide an industrial furnace in which on the one hand it is possible to treat, that is, in particular to refine and homogenize a non-ferrous metal, for example copper by means of a gas, and on the other hand to melt it at the same time. Of scrap metal. For the solution of this problem, according to the invention, an industrial furnace for the melting and gas treatment of non-ferrous metals having the following characteristics is provided: a steel jacket; - a refractory lining surrounding a free interior space is disposed on the inner surface of the steel jacket; at least one device for feeding gas into the interior space; - at least one burner to heat the interior space; the furnace is mounted to rotate at an angle of rotation of at least 40 ° about a horizontally extending pivot axis; - the interior space has a non-circular section area. The invention is based on the knowledge that the rotary kilns that until now are mainly used for the treatment with non-ferrous metal gas can be optimized in the sense of carrying out in each case with greater efficiency both the stage of the casting process and also refining and gas treatment if the interior space of the oven has a non-circular cross section. Whereas during the rotary movement of a rotary kiln according to the state of the art - by virtue of the circular section area of the interior space - the ratio of the bath surface of the metal casting bath always remains the same with respect to its depth, even in the case of a rotation of the furnace around its longitudinal axis, this ratio can be varied by turning the furnace around its axis of rotation in a furnace whose interior space has a non-circular sectional area. In particular it is possible that the dimensions of the sectional area of such a furnace are, for example, such that the furnace can be rotated to a first position in which the proportion of the bath surface of a nonferrous metal melt present in the interior space (hereinafter also referred to as "metal broth") is greater than its depth (hereinafter referred to as "melting position") as in the second position of the furnace (hereinafter also referred to as "gas treatment position") ") to which the oven can also be turned. Accordingly, the melting position is characterized in that with an invariable volume of the melt the proportion of the bath surface of the melt with respect to the height of the bath (or bath volume) is greater than at the position of gas treatment. By turning the furnace around its axis of rotation it is possible to turn the furnace from its melting position to its gas treatment position. It is preferably proposed that the furnace can rotate back and forth from a melting position to a gas treatment position by a 90 ° turn around its axis of rotation; but in accordance with the invention it was found that from a rotation of 40 ° a sufficient variation of the proportion of the bath surface of a metal broth present in the interior space can be obtained with respect to its depth (or volume) , so that in the fusion position it is possible to efficiently melt a non-ferrous and after metal. a 40 ° turn to treat it in the gas treatment position. Therefore, according to the application it is proposed that the industrial furnace according to the invention be mounted so that it can be rotated by an angle of rotation of at least 40 ° around the longitudinally extending axis of rotation. Correspondingly, the furnace can also rotate through an angle of rotation of at least 50 °, 70 °, 90 °, 120 °, 160 ° or 180 °. By virtue of the fact that it is also necessary for the furnace to be able to rotate in order to be able to bring the furnace to a position in which the metal broth can be led out through an opening (emptying position), the furnace can rotate, for example, by an angle between 40 ° and 120 ° or between 70 ° and 120 ° to be able to swing back and forth between the fusion position and the gas treatment position, and by an angle between 40 ° and 180 ° or between 90 ° and 180 ° to be able to swing back and forth between the fusion position and the emptying position. The furnace comprises at least one device for feeding gas to the interior space, for example, nozzles under the bath by means of which it is possible to treat the non-ferrous metal broth present in the interior space in the gas treatment position. Cumulatively the furnace may comprise at least one additional device for feeding gas into the interior space by which it is possible to treat the melt of non-ferrous metal also in the melting position. With an invariable volume of the metal broth bath it is possible that the dimensions of the section area of the furnace be such that the metal broth in the melting position of the furnace has such a large bath surface and such a small bath depth that it is possible to melt non-ferrous metal scrap, and - in the gas treatment position has a bath height so large that in this position the gas that is injected into the interior space through the metal broth bath by the gas supply devices that are in the lower part of the bath flows for long enough through the bath of metal broth as to be able to treat it (that is, in particular to refine, alloy and homogenize). Because it is possible to rotate the furnace from the melting position back and forth to the gas treatment position, the furnace according to the invention can be used simultaneously both as a furnace for melting and also for the gas treatment of metals non-ferrous The furnace according to the request can have, basically, any non-circular section area at discretion - being that the sectional area is in a geometric plane perpendicular to the axis of rotation. The section area can be identical or also different from. along the entire length of the interior space of the oven. For example, it is possible for the section area to be configured in different cases in different places of the interior space, since these different section areas can be transformed one into another, for example, along straight or curved lines. According to one embodiment it can be proposed that the interior space of the furnace - for example, in one or both of its axial end regions - has an area of circular section that towards the center of the furnace is transformed in each case into a non-circular section area. Correspondingly, the interior space of the furnace may comprise only a non-circular sectional area by sections. By virtue of its non-circular section area, the interior space of the furnace has (necessarily) different diameters. In this aspect it can be proposed that the section area has precisely a maximum diameter and precisely a minimum diameter that can be transformed one into another, for example, along straight or curved lines. If the maximum diameter and minimum diameter are transformed into one another along a straight line, this section area corresponds to a rhombus. If the maximum diameter and minimum diameter are transformed into one another along curved lines (continuously), the section area corresponds to an ellipse or an oval. According to a preferred embodiment, the maximum diameter and the minimum diameter of the section area can be extended orthogonal to one another; however, it is fundamentally possible that both diameters are extended relative to each other by enclosing any angle at discretion, for example, an angle between 30 ° and 90 °, between 60 ° and 90 ° or between 80 ° and 90 ° (the angular specifications mentioned above refer in each case to the smallest angle enclosed between both diameters). In addition to the area of elliptical, oval or rhomboid section already referred to in the foregoing which may have the interior space of the oven, it may also have, for example, a sectional area in the shape of a pear or polygonal. As an area of polygonal section, the interior space may have, for example, an area of triangular, quadrangular, pentagonal or hexagonal section. However, it is preferable that the interior space of the furnace according to the application has an elliptical or oval cross-sectional area. In the case of an area of elliptical or oval section of the interior space, the longest of both main axes of the ellipse or the oval can, for example, be longer by between 1.2 and 3 times or between 1.6 and 2.4 times that the shortest of both main axes. According to a preferred embodiment it is proposed that the maximum diameter of the sectional area of the interior space be arranged horizontally in the melting position of the furnace. In other words: in the melting position the bath surface of a metal broth extends parallel to the maximum diameter in the interior space of the furnace. But it is also possible to adopt any other favorable position for smelting or refining. Similarly, according to another preferred embodiment, it can be proposed that the minimum diameter of the section area of the interior space be arranged horizontally in the gas treatment position of the furnace. In other words: in the gas treatment position the bath surface of a metal broth extends parallel to the minimum diameter in the interior space of the furnace. Similarly, in an interior space with an elliptical or oval section area, the longest of both main axes extends horizontally in the melting position of the furnace, since the shortest of the main axes extends horizontally in the gas treatment position of the furnace. The interior space of the furnace can have, for example, the shape of a cylinder with an area of non-circular section at its discretion. Preferably the interior space of the furnace has the shape of a cylinder, with an elliptical or oval sectional area. In the case of the shape of the interior space mentioned last, the axis of the cylinder can extend parallel to the axis of rotation of the furnace. According to one embodiment, it is proposed that the interior space be in the form of an ellipsoid. The furnace comprises at least one device for supplying gas to the interior space (hereinafter only referred to as the "gas supply device"). The gas is used for the treatment of the metal broth, or in particular for its refining, alloying or homogenization. A gas feeding device of this type can consist in each case of one or more nozzles, for example, nozzles under the bath, or sink-like formations, which respectively are known from the state of the art for the treatment of a broth. metal. It is possible to incite the gas in the nozzles or in the sink-type formations in each case individually or in groups. For the oxidation of the metal broth in the interior space of the furnace it is possible for a reactive gas, in particular, for example, air, oxygen, chlorine gas or mixtures of gases, to be supplied to the metal broth through the gas supply device. these. In order to improve the intermixing (homogenization) or to uniformize the metal broth, it is possible that a gas which is inert or inert, for example, nitrogen or gas, is insufflated through the gas supply devices into the metal broth. argon. Additionally, for a reduction of the metal broth it is possible to blow into the metal broth a suitable reducing gas at discretion, for example, natural gas, LP gas, • ammonia, hydrogen or fluid hydrocarbons (oils). In particular, the gas supply devices can open into the interior space in two areas: On the one hand it is possible that the gas supply devices (hereinafter also only referred to as "gas supply devices for the treatment position by gas ") opens into an area of the interior space which, in the gas treatment position, is below the bath surface of the melt bath. These gas supply devices for the gas treatment position are provided to supply gas to the metal broth in the gas treatment position. Preferably it is proposed that in the fusion position the gas supply devices for the gas treatment position are above the bath surface of the melt bath. - On the other hand it is possible that the gas feeding devices (hereinafter also referred to only as "gas feed devices for the melting position") open into an area of the interior space which in the melting position is below the bath surface of the melt bath. These gas feed devices for the melting position are provided to supply gas to the metal melt in the melting position. It is preferably proposed that in the gas treatment position the gas supply devices for the melting position are located above the bath surface of the melt bath. By means of the gas feeding devices for the melting position it is possible to obtain a pre-refining or pre-homogenization of the metal broth already in the melting position of the furnace.

The gas supply devices can open into the interior space in each case along a straight line, that is, along a line. Preferably the devices for the gas supply are arranged along. of several straights. These straight lines can extend, for example, substantially parallel to each other, and, for example, in each case, substantially parallel to the axis of rotation. Both the gas supply devices for the melting position as well as the gas supply devices for the gas treatment position can each end in the. interior space along one or more lines. The gas feed devices for the gas treatment can be arranged, for example, along several straight lines so that they open into the internal space displaced relative to each other relative to the adjacent straight lines; by this it is possible to introduce the gas distributed very uniformly in. the molten mass of non-ferrous metal. The same applies analogously to the arrangement of the gas supply devices for the fusion position. It is preferably proposed that the area in which the gas supply devices for the gas treatment position open into the interior space, and the area in which the gas supply devices for the fusion position open into the interior space they are arranged transposed with respect to each other by a defined angle of rotation (as a reference point to determine the angle of rotation is defined in a zone its central axis that extends parallel to the axis of rotation). In this regard, it is proposed that both these zones be disposed transposed to one another, for example, by an angle of rotation of between 5 ° and 180 °, that is, for example, also by an angle of rotation of between 30 ° and 170 °. ° or by an angle of rotation between 70 ° and 150 °. In other words: if the furnace is, for example, in the melting position (and therefore the gas feeding devices for the melting position in a position where they are located below the metal broth bath so that the treatment liquid can be supplied to the metal broth optimally), then it is necessary to rotate the furnace around its axis of rotation by an angle of rotation as indicated above until it is in the position for gas treatment (and consequently the gas supply devices for the gas treatment position in a position in which they are located under the metal broth bath so that the treatment gas can be supplied to the metal broth in an optimum manner). The gas supply devices for the gas treatment position can be located on or adjacent to one or both of the points of intersection of the maximum diameter of the sectional area of the interior space with the wall of the interior space consisting of a refractory lining. oriented towards the interior space. By this it is possible for the metal broth to be supplied with the treatment gas in the region of the greatest depth of the bath in the gas treatment position. In the same way it is possible that the feeding devices. of gas for the fusion position are located in or adjacent to one of both points of intersection of the minimum diameter of the sectional area of the interior space with the wall of the interior space consisting of a refractory lining oriented towards the interior space. By means of this it is possible to supply the treatment liquid in the deeper zone of the bath in the melting position to the metal broth. The axis of rotation can extend through the interior space of the furnace. As soon as the interior space has the shape of a cylinder, the axis of rotation of the furnace can extend coaxially to the axis of the cylinder. According to another embodiment, it is proposed that the axis of rotation extends offset with respect to the cylinder axis of the interior space. To heat the interior space of the oven, this comprises at least one burner. The or respectively the burners can open into the interior space on an extreme axial lateral surface of the interior space (side wall burners) or in an axial end region of the steel sleeve (top burners). The upper burners may open into the interior space in an area adjacent to the lateral surface of the interior space. As soon as the axis of rotation of the furnace extends through the internal space of the furnace, it is proposed that the or respectively the side wall gums flow into the interior space on one of both extreme axial side surfaces in which the axis of rotation intersects the coating. In this aspect, it is proposed that the or respectively the side or top wall burners be provided only in one of both extreme axial zones and in the other extreme axial zone of the interior space a device be provided for evacuating the combustion gases from the interior space. . This gas evacuation device can suitably open, either on the lateral surface of the interior space or on the surface of the interior space. In this embodiment, the combustion gases are introduced correspondingly to the interior space of the furnace in an extreme axial zone and are evacuated at the opposite end. As burners, any suitable burners known from the state of the art can be used. Alternatively it is possible to use a device for the inductive casting of a non-ferrous metal instead of a burner. The furnace according to the application may comprise at least one opening opening from the outside into the interior space for feeding a non-ferrous metal into the interior space. The dimensions of this opening can be such that it is possible to feed into the interior space through this opening both a metal stock and also scrap metal. The industrial furnace may comprise at least one of the following additional openings opening from the outside into the interior space: an opening for conducting a liquid non-ferrous metal outside the interior space, or a slag opening through which the scum of the interior space. It is also proposed that it is possible both to feed non-ferrous metal as well as to conduct off-ferrous non-ferrous metal to / from the furnace through a single opening. These openings can be closed by means of a closing element so that the liquid metallic broth of the interior space can not escape through to the outside when the metal broth weighs on this closing element in the interior space, for example when the element of . closure or respectively the opening is below the surface of the bath. The industrial furnace according to the application is held together by an external steel jacket. The steel jacket may have a section area at its discretion, for example, an area of elliptical, oval, circular or polygonal section (ie, quadrangular or octagonal). In order for the furnace according to the application to rotate about its longitudinal axis, it is possible to resort essentially to the known state of the art for turning or tilting a furnace for the treatment of non-ferrous metals. As soon as the steel jacket - at least in its lower region - has a circular section area, it can be mounted on a roller bed and rotated about its axis of rotation by means of a roller bearing. According to another embodiment, the furnace can be mounted to oscillate, and rotate around the mounting point by means of a tilting device, for example, a hydraulic tilting device. A refractory lining enclosing the free interior space is disposed on the inner surface of the steel jacket. For the choice of the refractory material of this refractory lining it is possible to resort to the known state of the art for the coating of furnaces for the treatment of non-ferrous metals. For example, it is possible to use magnesium-chrome bricks, aluminum silicate bricks or silicon carbide bricks. Preferably the refractory lining is disposed self-supporting in the steel jacket. A suitable self-supporting assembly of the refractory material is known, for example, from the prior art for preparing rotary furnaces or rotary tubular furnaces (for calcining cement clinker). The bricks do not need to be fixed by means of possible fasteners to the steel jacket that surrounds them, but they rest on each other in the form of a 360 ° arc. By this it would be possible for the furnace to rotate 360 ° around its longitudinal axis.

The industrial furnace according to the application can be used for the treatment of any non-ferrous metal at discretion, for example, copper, lead, nickel, aluminum, tin or zinc or alloys thereof. However, it is preferably used for the treatment of copper. All the characteristics of the industrial furnace in accordance with the application disclosed in this application can be combined with each other in any way, and this in each case individually or in combination with each other. Additional characteristics of the furnace in accordance with -. the invention are derived from the documents of the application, in particular also from the figures. An embodiment of the furnace according to the application is explained in more detail in the following description of the figures. They show in each case in very schematic representation, Figure 1 a view of the furnace in side elevation along a section along the axis of rotation; Figure 2 a view of the furnace in plan along a section in the line B-B according to figure 1, parallel to the axis of rotation; 3 shows a side elevational view of the furnace along a section in line AA according to FIG. 1, perpendicular to the axis of rotation; FIG. 4 shows a view of the furnace according to FIG. 3, but rotated through an angle; of 90 ° rotation; Figure 5 a view of the furnace according to figure 3, but rotated by a turning angle of 147 °. The furnace which in Figure 1 is characterized in its entirety by the reference symbol 1 has substantially the external shape of a cylinder with an oval section area, the axis of the cylinder extending coaxially to the axis D of rotation of the furnace 1 In Figure 1 the furnace 1 is in the fusion position. The furnace 1 has an outer steel jacket 3 on whose inner surface a refractory lining 5 of a magnesium-chromium material enclosing a free inner space I is arranged. The interior space I also has the shape of a cylinder with an oval section area, the axis of the cylinder extending coaxially to the axis D of rotation of the furnace 1. On one of its two axially extreme side faces 7r (in the figure 1 on the right) two side wall burners 9, 11 open (in FIG. 1 only the burner 11 is visible) in the interior space I. On the opposite side surface 71, an opening 13 opens into the interior space I. which the gases lost from combustion are evacuated from the interior space I as well as the reaction products such as volatile dust and waste gas from the process. The interior space I forms in its lower part a gutter in which there is a molten mass of copper, indicated by a scratch. The jacket surface of the furnace 1 comprises several openings 171, 17r, 19 which in each case open into the interior space I through the steel jacket 3 and the covering 5. In the fusion position according to FIG. , the openings 13, 171, 17r, 19 and the burners 9, 11 open into the interior space I above the surface 15o of the melt bath 15. Through the openings 171, 17r it is possible to charge the furnace 1 with a copper melt and / or with copper scrap. The openings 171, 17r are located in the lateral region of the jacket surface. The opening 19 serves to conduct the molten copper mass 15 out of the interior space I of the furnace 1. The opening 19 is in the upper region of the jacket surface.

Figure 2 shows the furnace 1 according to figure 1 in top plan view, and this along the line of section BB according to figure 1. It can be recognized that both burners 9, 11 open at the inner space I displaced laterally with respect to the axis D of rotation. In figure 3 showing a view of furnace 1 in a section along line A-A according to figure 1 the area can be recognized of oval section of the interior space I. The shortest main axis (minimum diameter) of the section area of the interior space 1 is characterized with the reference symbol dmin and its longest main axis (maximum diameter) with the reference symbol dmax.- The axis. The longer main dmax and the shorter main dmin axis are found by enclosing a 90 ° angle between them. The turning axis D of furnace 1 is perpendicular to the plane of the drawing and intersects it at the point of section of both main axes dmin, dmax of the section area. As stated in the foregoing, in the - figure 3 the furnace 1 is in its fusion position.

Correspondingly the longest main axis dmax of the sectional area of the interior space I extends horizontally and the main axis dmin shorter extends vertically. Adjacent to the lower intersection point 21 of the shortest main axis with the wall of the inner space I facing the interior space I formed by the refractory lining 5 extends an area S into which they open into the interior space I several gas feed devices for the melting position in the form of nozzles 23, 25. The gas feed devices 23, 25 for the melting position are arranged so that a part of them flow into the interior space I with their points .23m of mouth along a first section and the other part of them with its points 25m of mouth along a second section. The points 23m, 25m of outlet are arranged offset with respect to others from section to section. In Figure 3 both sections extend in each case perpendicular to the plane of the drawing through the opening point 23m and respectively the point 25m of outlet. Both sections extend correspondingly parallel to the axis D of rotation. To clarify, in figure 2 is indicated the extension of the points 23m, 25m of mouth - being that in figure 2 the mouth points are below the plane of the drawing. Adjacent to a point 27 of lateral intersection (in this case the left one) of the main axis dmax longer with the wall of the interior space I oriented towards the interior space I extends the zone R where several devices open into the interior space I of gas supply for the gas treatment position in the form of nozzles 29, 31 in a manner analogous to the gas supply devices 23, 25 for the melting position. Both sections along which the points 29m, 31m of outlet of the gas supply devices 29, 31 for the gas treatment position are arranged, similarly extend parallel to the axis D of rotation. As long as the outlet points 29m, 31m of the gas supply devices 29, 31 for the gas treatment position open into the interior space I above the surface 15o of the melt bath 15 in the melting position according to FIG. 3, the opening points 23m, 25m of the gas supply devices 23, 25 for the fusion position naturally flow into the interior space I below the surface 15o of the melt bath 15 in the melting position in accordance with Figure 3. The area in which the gas supply devices 23, 25 for the fusion position open into the interior space I, and the area in which the gas supply devices 29, 31 gas for the treatment position by gas flowing into the interior space I are transposed relative to each other by a rotation angle of 130 ° in figure 3. For clarification, in figure 2 is represented in the gas supply devices 29, 31 for the gas treatment position. A first part of the gas supply devices for the gas treatment position - with the reference symbol 29 - is in a plane slightly above the drawing plane, another part of the gas supply devices for the position of gas treatment - with reference symbol 31 - is displaced with respect to that in another plane that is above the above-mentioned plane. The position of the burners 9, 11 and of the opening 13 is indicated by circles. In FIG. 3 it can be clearly seen that in the case of a large bath surface 15o oriented towards the interior space I the metal broth 15 has at the same time only a reduced bath depth. By this the combustion gases existing in the free part of the interior space I are directly in contact with the comparatively large bath surface 15o of the metal broth 15 in the melting position. Correspondingly it is possible to heat the broth. 15 very fast metallic and. efficiently, and thereby melt copper scrap quickly and efficiently. Simultaneously it is possible to supply gas to the metal broth by the gas supply devices 23, 25 for the melting position in order to be able to treat the metal broth. By virtue of which, however, the metallic broth only has a comparatively low bath height, the gases which are injected into the metal broth flow comparatively fast up to the surface 15 of the bath of the metal broth 15 and therefore remain only during a comparatively short time in the metallic broth 15, so that efficient treatment of the metal broth can not take place.To be able to treat the metal broth 15 efficiently the kiln 1 is moved to the gas treatment position. purpose the furnace 1 is rotated counter-clockwise by 90 ° about its axis D of rotation from its melting position according to figure 3 until it is in its gas treatment position shown in FIG. Figure 4. In the gas treatment position according to Figure 4, the main axis dmin shorter extends horizontally, and the points 29m, 31m outflow d e the gas supply devices 29, 31 for the gas treatment position are below the surface 15o of the bath, while the points 23m, 25m for the opening of the gas supply devices 23, 25 for the position of fusion are above the 15th surface of the bath. In the gas treatment position it is now possible to feed the treatment liquid broth 15 via the gas supply devices 29, 31 for the gas treatment position, with effective refining and homogenization being carried out due to the fact that the height of the bath is comparatively high and the gas travels a comparatively long distance through the metallic broth 15 from the points 29m, 31m of gas injection to the 15th surface of the bath, and therefore has a comparatively long time to effectively treat the metallic broth 15 With a rotation of the furnace 1 around the axis of rotation by another 57 ° counterclockwise (that is, by a turning angle of 147 ° in total with respect to the fusion position) the furnace 1 In this position, the opening point 19m of the opening 19 for unloading the metal broth the inner space I as well as its exit on the outer side of the furnace 1 is located under the bath surface of the metal broth, so that it is possible to conduct the metal broth out of the interior space I of the furnace.

Claims (18)

1. CLAIMS 1. Industrial furnace for melting and treating non-ferrous metals with gas, characterized by comprising: a) a steel jacket; b) a refractory lining disposed on the inner surface of the steel jacket, which encloses a free interior space; c.) at least one device for feeding gas to the interior space; d) at least one burner to heat the interior space; e) the furnace is mounted to rotate at an angle of rotation of at least 40 ° about a horizontal extension pivot axis; f) the interior space has a non-circular section area.
2. 2. Industrial furnace according to claim 1, characterized in that it has an elliptical section area, oval, with. Pear shape, rhomboid or polygonal. Industrial furnace according to claim 1 having an elliptical or oval cross-sectional area, characterized in that the longest of both main axes of the ellipse or oval is longer by 1.2 to 3 times than the shortest of both axes main. 4. Industrial furnace according to claim 1, characterized in that its interior space has the shape of a cylinder with an elliptical or oval section area. Industrial furnace according to claim 4, characterized in that its cylinder axis extends parallel to the axis of rotation. 6. Industrial furnace according to claim 1, characterized in that its axis of rotation extends through the interior space. 7- Industrial furnace according to claim 4, characterized in that its axis of rotation is on the axis of the cylinder. 8. Industrial furnace, according to claim 4, characterized in that its axis of rotation extends offset with respect to the axis of the cylinder. "9. Industrial furnace according to claim 1, characterized in that the burner (s) opens into the interior space on an extreme axial lateral surface of the interior space or in an axial end region of the steel jacket, for example, also as top gemadores 10. Industrial furnace according to claim 9, characterized in that to evacuate the combustion gases from the interior space, a device is located on the other extreme axial side surface of the interior space or in the other axial region. end of the steel jacket 11. Industrial furnace according to claim 1, characterized in that the devices for feeding gas into the interior space open into the interior space arranged in two areas that are displaced relative to each other by an angle of rotation with respect to the axis of rotation 12. Industrial furnace according to claim 11, characterized in that the two zones They are transposed to one another by an angle of rotation between 5o and 180 °. 13. Industrial furnace according to claim 11, characterized in that the two zones are transposed with respect to each other by an angle of rotation of between. 30 ° and 170 °. An industrial furnace according to claim 1, characterized in that it comprises at least one opening opening from outside in the interior space for feeding a non-ferrous metal to the interior space. Industrial furnace according to claim 1, characterized in that it comprises at least one opening opening from outside in the interior space for conducting a liquid non-ferrous metal outside the interior space. An industrial furnace according to claim 1, characterized in that the external surface of its steel jacket has substantially the shape of the jacket surface of a circular cylinder, of a cylinder with an elliptical section area or of a cylinder with a oval section area. 17. Industrial furnace according to claim 1, characterized in that the refractory lining is disposed self-supporting in the steel jacket. 18. Industrial furnace according to claim 1, characterized in that it can be rotated by an angle of rotation of al. less 50 ° or at least 70 ° around the axis of rotation.