JP4739566B2 - Reduction melting accelerator for electric furnace and method of operating electric furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel that is a safe fuel that can replace fossil fuels and the like and that can suppress the consumption of earth resources, that is, a new reduction melting accelerator for electric furnaces and an electric furnace operating method using the same.
[0002]
[Prior art]
FIG. 8 is a principle diagram of a conventional electric furnace. An electric furnace 100 is a facility for melting scrap by arc discharge, and is a cup-shaped furnace body in which a refractory 103 is lined on a frame 102 standing on a foundation 101. 104 is mounted so as to be tiltable in the direction of the front and back of the drawing, and the upper opening of the furnace body 104 is closed with a furnace lid 106, and three electrodes 107... , The cable 108 is connected to the electrodes 107..., And power is supplied to the electrodes 107.
[0003]
The furnace cover 106 can be opened by being raised and turned by the furnace cover raising / lowering turning mechanism 110, and scrap can be put into the furnace when the cover is opened. The electrodes 107 can be moved up and down by the electrode lifting mechanism 111 and can be held at an arbitrary height. Thereby, an arc discharge can be generated between the electrodes 107... And the scrap and the furnace body 104.
[0004]
[Problems to be solved by the invention]
9 is a cross-sectional view taken along the line 9-9 in FIG. 8, and the area around the three electrodes 107... Disposed in the center of the furnace body 104 is directly exposed to arc discharge to become a high temperature region A. Since the vicinity of 103 is away from the arc discharge, it becomes a low temperature region B. In this low temperature region B, the melting of the scrap is delayed, so that the operation time of the electric furnace is extended and the production rate of the electric furnace is lowered.
[0005]
FIG. 10 is a principle diagram of a conventional low temperature region elimination method. Conventionally, oxygen gas and coke are passed through the lances 111 and 11 through heat-resistant pipes called lances 111 and 111 from the furnace lid or the furnace body opening. Attempts have been made to eliminate the low temperature region by blowing powder or heavy oil into a low temperature portion in the furnace body 104. However, oxygen gas is easy to explode and difficult to handle. In addition, since coke powder is made from coal, fossil fuel is consumed. Similarly, heavy oil will consume fossil fuels. From the viewpoint of suppressing global environmental problems in recent years and the consumption of valuable resources, it is not preferable to consume a large amount of coke powder or heavy oil.
Accordingly, an object of the present invention is to provide a fuel that is a safe fuel that can replace fossil fuels and the like and that can suppress the consumption of earth resources, that is, a new reducing dissolution accelerator for an electric furnace.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a reduction melting accelerator for an electric furnace that promotes melting of the scrap by mixing with scrap put into the electric furnace and exerts a reducing action. agent, waste paper, heat-softenable waste plastics, thermosetting plastic waste, the multiple of the variable fuel waste and incombustible waste, mixed and compacted by compressing, one side or diameter of 8~40mm Ri Ah in pieces, blending ratio of the electric furnace for reducing the dissolution enhancer, and 1-10 wt% of the paper, and a heat-softenable plastic to a lower limit of 10 wt%, the weight of the thermosetting plastic waste was added the weight of the heat-softenable plastic, waste plastic aggregate is characterized 80-99 wt% der Rukoto.
[0007]
The piece is mainly composed of waste plastic, which is rich in carbon, which is linked to the oxygen bound to the iron elements of the scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the heat quantity of the piece is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with the piece, it is possible to save power supplied to the electric furnace.
[0008]
Waste plastic has conventionally been landfilled or incinerated, but in the present invention, it is used as a reducing dissolution accelerator for electric furnaces, so that effective use of earth resources can be promoted.
Therefore, according to the first aspect, it is possible to improve the productivity of the electric furnace and save the electricity bill while promoting the effective use of the earth resources.
[0009]
If the piece size is less than 8 mm, the combustion duration is too short. Moreover, if the size of the piece exceeds 40 mm, a gap is formed between the pieces, and it is difficult to increase the filling density of the pieces. Therefore, the size of the piece was decided to be 8 to 40 mm.
[0010]
Claim 2 is a reduction melting accelerator for an electric furnace that promotes melting of scrap by blowing into the electric furnace and exerts a reducing action. The reducing dissolution accelerator for electric furnace is used paper, heat softening waste plastic, thermosetting plastic waste, the multiple of the variable fuel waste and incombustible waste, mixed, into pieces harden by compressing, in 0.01~3.0mm by further crushing the piece Ri powder der size, blending ratio of the electric furnace for reducing the dissolution enhancer, and 1-10 wt% of the paper, and a heat-softenable plastic to a lower limit of 10 wt%, a thermosetting waste weight of plastic plus the weight of the heat-softenable plastic, waste plastic aggregate is characterized 80-99 wt% der Rukoto.
[0011]
The difference from claim 1 is that the pieces are further crushed. It is possible with the prior art to directly crush waste plastic and the like into powder. However, according to this prior art, only a light powder containing many voids can be obtained. On the other hand, according to the second aspect, the density is increased by volume reduction processing, that is, pressing and solidifying at the stage of making into pieces, so that the powder obtained by crushing this is also dense and becomes a heavy powder. Because it is a heavy powder, the blowing direction is determined and there is no fear of scattering.
[0012]
The powder contains waste plastic as a main component, and the waste plastic contains abundant carbon, which is connected to oxygen that binds to iron elements of scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the amount of heat of the powder is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with powder, the power supplied to the electric furnace can be saved.
[0013]
Waste plastic has conventionally been landfilled or incinerated, but in the present invention, it is used as a reducing dissolution accelerator for electric furnaces, so that effective use of earth resources can be promoted.
Therefore, according to the second aspect, it is possible to improve the productivity of the electric furnace and save the electricity bill while promoting the effective use of the earth resources.
[0014]
In addition, when the particle size of the powder is less than 0.01 mm, it is too fine and difficult to manufacture, and the manufacturing cost increases. Further, if the particle size of the powder is more than 3.0 mm, the combustion time becomes long and it is difficult to burn at the target location. Therefore, the powder has a size of 0.01 to 3.0 mm.
[0015]
The method for operating an electric furnace according to claim 3 is characterized in that a scrap layer and piece layers made of the reduction melting accelerator for electric furnace according to claim 1 are alternately laminated in the electric furnace and then melted by arc discharge. It is characterized by starting.
[0016]
The piece is mainly composed of waste plastic, which is rich in carbon, which is linked to the oxygen bound to the iron elements of the scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the heat quantity of the piece is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with the piece, it is possible to save power supplied to the electric furnace.
[0017]
If the piece size is less than 8 mm, the combustion duration is too short. Moreover, if the size of the piece exceeds 40 mm, a gap is formed between the pieces, and it is difficult to increase the filling density of the pieces. Therefore, the size of the piece was decided to be 8 to 40 mm.
[0018]
Operation method of the electric furnace according to claim 4, during the dissolution of the scrap inside the furnace low temperature region away from the electrodes, viewing window, tapping nozzle, towards the at least one tapping opening, claim using the lance The reduction melting accelerator for electric furnaces described in 2 is injected.
[0019]
The powder contains waste plastic as a main component, and the waste plastic contains abundant carbon, which is linked to oxygen that binds to iron elements in scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting.
[0020]
Such powder is blown with a lance toward at least one of the low temperature range in the furnace, the observation window, the steel outlet, and the tapping port away from the electrode, thereby eliminating the low temperature range and producing time. Can be shortened. And by supplying a part of the necessary heat with powder, the power supplied to the electric furnace can be saved.
[0021]
In addition, when the particle size of the powder is less than 0.01 mm, it is too fine and difficult to manufacture, and the manufacturing cost increases. Further, if the particle size of the powder is more than 3.0 mm, the combustion time becomes long and it is difficult to burn at the target location. Therefore, the powder has a size of 0.01 to 3.0 mm.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 (a) and 1 (b) are production flow diagrams of a reducing dissolution accelerator for an electric furnace according to the present invention. STxx indicates a step number. In addition, the example of the apparatus for implementing each process is demonstrated in FIGS.
[0023]
Since there are two forms of reduction melting accelerators for electric furnaces, pieces and powders, the manufacturing process of pieces and powders will be described.
(A) on the left of the figure is a manufacturing process diagram of the piece according to the present invention.
ST01 (mixing step): Mix one or more of waste paper, heat softening waste plastic, thermosetting waste plastic, other combustible waste and nonflammable waste.
[0024]
Typical examples of used paper are cardboard, magazines, and used paper that does not become papermaking materials.
Thermosetting waste plastics are fluids that temporarily rise when the temperature is raised, but gradually become solid due to a chemical change and change into a hard substance, such as phenolic resin, urea resin, and epoxy resin. .
[0025]
Other combustible waste refers to waste such as cloth, paper, wood, FRP (fiber reinforced plastic), and laminated paper.
Other non-combustible wastes refer to wastes such as glass wool, lime and slag.
[0026]
A heat-softening waste plastic is solid at room temperature, but melts and softens when heated, becomes a fluid, and solidifies when cooled, such as polyethylene, polystyrene, and polypropylene.
[0027]
As a blending example (% is all weight%), waste paper is 10%, thermosetting waste plastic is 70%, other combustible waste is 5%, and thermosoftening waste plastic is 10%. Alternatively, waste paper is 1 to 5%, and the remaining 95 to 99% is the total amount of waste plastic (thermosetting waste plastic + thermosoftening waste plastic). Since it is a blending example, it is safe to change the type and blending ratio as appropriate.
[0028]
It is desirable to mix waste paper in order to improve moldability. However, as the ratio of used paper increases, the calorific value decreases, and the value as a reducing dissolution accelerator for electric furnaces decreases. Therefore, waste paper is mixed within a range where the value does not decrease in consideration of the heat generation amount and the like.
[0029]
The heat-softening waste plastic has both a fuel function and an adhesive function. Accordingly, the blending ratio of the heat softening waste plastic can be large.
[0030]
ST02 (crushing step): The obtained mixture is crushed to a size of 8 to 80 mm.
This is because if the size of the crushed material exceeds 80 mm, the piece granulation is affected and it becomes difficult to produce pieces of 8 to 40 mm. Therefore, the smaller the size of the crushed material, the better. However, the smaller the size, the higher the manufacturing cost. What is necessary is just to crush to the magnitude | size of 8-80 mm, However, Preferably it shall be about 40 mm. This is because both the granulation (sizing) and the crushing cost are sufficiently satisfied.
[0031]
ST03 (compression step): The obtained crushed material is compressed until the heat-softening waste plastic is softened. When heat-softening waste plastics are compressed at high pressure, frictional heat is generated, and the heat softens and becomes viscous, so that an adhesive action is generated. In particular, when the crushed material is extruded through a die hole described later, a large frictional heat is generated due to the extrusion resistance of the die hole.
[0032]
ST04 (Sizing process): The obtained compressed product is made into pieces of 8 to 40 mm. If the piece size is less than 8 mm, the combustion duration is too short. Moreover, if the size of the piece exceeds 40 mm, a gap is formed between the pieces, and it is difficult to increase the filling density of the pieces. Therefore, the size of the piece was decided to be 8 to 40 mm.
[0033]
As is clear from the above steps, it is characterized in that it does not require a special drying step and is easily available because the raw material is waste.
[0034]
FIG. 2 is a principle view of a crushing apparatus suitable for producing the reducing dissolution accelerator for an electric furnace according to the present invention. The crushing apparatus 10 is a mixture of a mixture 11 introduced from above with a fixed blade 12 and a rotary blade 13. It is a device that cuts and drops through a screen 14 of eyes of 8 mm to 80 mm. By changing the screen 14, the size of the crushed material 21 can be changed. A pusher 15 extrudes the mixture 11 in accordance with the rotation speed of the rotary blade 13. Reference numeral 16 denotes a discharge conveyor.
With this crushing apparatus 10, the mixture 11 can be made into a crushed material 21 of 8 to 80 mm. In addition, the structure of the crushing apparatus 10 shows an example, and if the 8 to 80 mm crushing material 21 is obtained, another structure may be used.
[0035]
FIG. 3 is a principle diagram of a compression / granulation apparatus suitable for producing the reducing dissolution accelerator for an electric furnace according to the present invention. This compression / granulation apparatus 30 converts a crushed material 21 into a rotary drum-shaped die 31. A charging duct 32 to be inserted into the roller, rollers 33 and 34 for supporting and rotating the die 31, a number of die holes 35 opened in the die 31 (... indicates a plurality, the same applies hereinafter), The crushed material 21 which is composed of a cutter 36 and a casing 37 arranged along the outer peripheral surface of the die 31 and is introduced into the die 31 through the introduction duct 32 is strongly pressed by the roller 33, and as a result, enters the die hole 35. enter in. After that, by cutting with a cutter 36, pieces 41 are formed. This effect is difficult to understand and will be described in detail in the next figure.
[0036]
FIG. 4 is an operation principle diagram of the compression / granulation apparatus shown in FIG. 3. For convenience, the cylindrical die 31 is developed into a flat plate shape.
In the die hole 35, the previous crushed material 21 is contained, and when another crushed material 21 is pushed into the die hole 35 with the roller 33, the crushed material 21A from the die 31 is equivalent to the thickness of the die 31 like "Tokoten". Starts out. Therefore, if this crushed crushed material 21A is cut with a cutter 36, a piece 41 having a fixed diameter and a fixed length can be cut out.
[0037]
(B) of FIG. 1 is obtained by adding ST05, and description of ST01 to ST04 is omitted.
That is, the pieces having a size of 8 to 40 mm obtained in the sizing step (ST04) are crushed in ST05 to obtain a powder having a size of 0.01 to 3.0 mm. The description of the apparatus used in this powdering step is omitted, but it is only necessary to finely pulverize by any one of a crusher, a cutting machine, a crusher, or a combination thereof, and classify the particles with a classification sieve.
[0038]
(B) is characterized by further crushing the pieces. It is possible with the prior art to directly crush waste plastic and the like into powder. However, according to this prior art, only a light powder containing many voids can be obtained. On the other hand, according to (b), since the density was increased by volume reduction processing, that is, pressing and solidifying at the stage of making into pieces, the powder obtained by crushing it becomes dense and becomes a heavy powder.
[0039]
Next, the operation method of the electric furnace performed using the piece or powder produced by the above method will be described.
FIG. 5 is a cross-sectional view of an electric furnace using the piece of the present invention. In the electric furnace 50, a scrap layer 51... And a piece layer 52 having a side or diameter of 8 to 40 mm and using waste plastic as a main raw material. .., And are alternately stacked and then melting by arc discharge is started.
[0040]
It is possible to achieve the object of the present invention by mixing pieces made mainly of waste plastic with scrap. However, when a mixture of scrap and pieces is used for charging an electric furnace with a scrap conveyor, the sizes of the scrap and the pieces are remarkably different from each other, so that problems such as spilling of the pieces from the scrap conveyor occur. Therefore, in FIG. 5, the scraps and pieces are charged separately to prevent the pieces from scattering.
That is, the piece can be blown into the furnace with a tube or hose. Therefore, the scrap charging operation can be simplified by charging the scrap and the piece separately, like charging the scrap using a conventional conveyor or bucket as it is and charging the piece with a tube or a hose.
[0041]
The pieces constituting the piece layer 52 are mainly composed of waste plastics, and the waste plastics are rich in carbon, and this carbon is bound to oxygen that binds to iron elements of scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. By supplying a part of the necessary heat with the piece, the power supplied to the electric furnace can be saved.
[0042]
If the piece size is less than 8 mm, the combustion duration is too short. Moreover, if the size of the piece exceeds 40 mm, a gap is formed between the pieces, and it is difficult to increase the filling density of the pieces. Therefore, the size of the piece was decided to be 8 to 40 mm.
[0043]
FIG. 6 is a first explanatory view of the operation method of the electric furnace using the powder of the present invention. By passing the lid 54 on the furnace body 53, the tip of the lance 55. Since the low temperature region in the furnace away from the furnace, specifically, the vicinity of the refractory wall 57 is a low temperature region, a powder having a size of 0.01 to 3.0 mm and using waste plastic as a main raw material toward this region Inject 59 ... Since the density of the powder 59... Is increased by previously reducing the volume of the waste plastic, that is, by pressing and compacting, the powder obtained by crushing the waste plastic becomes dense and becomes a heavy powder. Because it is a heavy powder, the blowing direction is determined and there is no fear of scattering.
[0044]
The powder contains waste plastic as a main component, and the waste plastic contains abundant carbon, which is connected to oxygen that binds to iron elements of scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the amount of heat of the powder is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with powder, the power supplied to the electric furnace can be saved.
[0045]
FIG. 7 is a second explanatory view of the operation method of the electric furnace using the powder of the present invention, and the tip of the lance 55... The powder 59 ... which uses waste plastic as the main raw material is blown in.
Since the powders 59... Are fine particles, they are burned quickly, and the heat is used to warm the vicinity of the steel outlet 61 and the steel outlet 62. In general, the steel outlet 61 and the ferrule 62 are difficult to insulate and are likely to be colder than other parts. Therefore, if such a low temperature region is heated, the low temperature region can be eliminated and the production time can be shortened. And by supplying a part of the necessary heat with powder, the power supplied to the electric furnace can be saved.
[0046]
Although not shown in the drawing, the vicinity of the viewing window that looks into the furnace from the outside of the furnace is also in a low temperature range. Therefore, it is desirable to spray the powder 59 of the present invention onto the viewing window with a lance. Therefore, the powder 59... May be blown into a low-temperature region in the furnace (the steel outlet 61, the tap outlet 62, the observation window or the like), and the place to blow is not limited to the illustrated place. Absent.
[0047]
The electric furnace is exemplified by an AC electric furnace having three electrodes, but the present invention can be applied to a DC electric furnace having one electrode.
[0048]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
Claim 1 is a reduction dissolution accelerator for an electric furnace mixed with one or more of waste paper, thermosoftening waste plastic, thermosetting waste plastic, other combustible waste and nonflammable waste. A hardened piece having a side or diameter of 8 to 40 mm was obtained.
The piece is mainly composed of waste plastic, which is rich in carbon, which is linked to the oxygen bound to the iron elements of the scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the heat quantity of the piece is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with the piece, it is possible to save power supplied to the electric furnace.
[0049]
Waste plastic has conventionally been landfilled or incinerated, but in the present invention, it is used as a reducing dissolution accelerator for electric furnaces, so that effective use of earth resources can be promoted.
Therefore, according to the first aspect, it is possible to improve the productivity of the electric furnace and save the electricity bill while promoting the effective use of the earth resources.
[0050]
Claim 2 is a mixture of one or more of waste reduction paper, thermosoftening waste plastic, thermosetting waste plastic, other combustible wastes and nonflammable wastes. The pieces were hardened into pieces, and the pieces were further made into a powder having a size of 0.01 to 3.0 mm by crushing treatment.
[0051]
The difference from claim 1 is that the pieces are further crushed. It is possible with the prior art to directly crush waste plastic and the like into powder. However, according to this prior art, only a light powder containing many voids can be obtained. On the other hand, according to the second aspect, the density is increased by volume reduction processing, that is, pressing and solidifying at the stage of making into pieces, so that the powder obtained by crushing this is also dense and becomes a heavy powder. Because it is a heavy powder, the blowing direction is determined and there is no fear of scattering.
[0052]
The powder is mainly composed of waste plastic, and scrap can be reduced in the same manner as in the first aspect. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the amount of heat of the powder is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with powder, the power supplied to the electric furnace can be saved.
[0053]
Waste plastic has conventionally been landfilled or incinerated, but in the present invention, it is used as a reducing dissolution accelerator for electric furnaces, so that effective use of earth resources can be promoted.
Therefore, according to the second aspect, it is possible to improve the productivity of the electric furnace and save the electricity bill while promoting the effective use of the earth resources.
[0054]
The method for operating an electric furnace according to claim 3 is characterized in that a scrap layer and piece layers made of the reduction melting accelerator for electric furnace according to claim 1 are alternately laminated in the electric furnace and then melted by arc discharge. It is characterized by starting.
The piece is mainly composed of waste plastic, which is rich in carbon, which is linked to the oxygen bound to the iron elements of the scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting. In particular, the heat quantity of the piece is useful in a region where the temperature tends to be low, and contributes to the elimination of the low temperature region.
If the low temperature range can be eliminated, the production time can be shortened. And by supplying a part of the necessary heat with the piece, it is possible to save power supplied to the electric furnace.
[0055]
Operation method of the electric furnace according to claim 4, during the dissolution of the scrap inside the furnace low temperature region away from the electrodes, viewing window, tapping nozzle, towards the at least one tapping opening, claim using the lance The reduction melting accelerator for electric furnaces described in 2 is injected.
The powder contains waste plastic as a main component, and the waste plastic contains abundant carbon, which is linked to oxygen that binds to iron elements in scrap. As a result, scrap can be reduced. In addition, waste plastic is a good quality fuel rich in carbon and hydrogen, so it provides some of the heat required for scrap melting.
Such powder is blown with a lance toward at least one of the low temperature range in the furnace, the observation window, the steel outlet, and the tapping port away from the electrode, thereby eliminating the low temperature range and producing time. Can be shortened. And by supplying a part of the necessary heat with powder, the power supplied to the electric furnace can be saved.
[Brief description of the drawings]
FIG. 1 is a production flow diagram of a reduction dissolution accelerator for an electric furnace according to the present invention. FIG. 2 is a principle diagram of a crushing apparatus suitable for manufacturing the reduction dissolution accelerator for an electric furnace of the present invention. Fig. 4 is a diagram showing the principle of a compression / granulation device suitable for producing the reducing dissolution accelerator for an electric furnace of the invention. Fig. 4 is a diagram showing the principle of operation of the compression / granulation device shown in Fig. 3. FIG. 6 is a first explanatory diagram of an electric furnace operating method using the powder of the present invention. FIG. 7 is a second explanatory diagram of an electric furnace operating method using the powder of the present invention. 8 is a diagram showing the principle of a conventional electric furnace. FIG. 9 is a sectional view taken along line 9-9 in FIG. 8. FIG. 10 is a diagram showing the principle of a conventional low temperature region elimination method.
41 ... Electric furnace reducing dissolution promoter (piece), 50 ... Electric furnace, 51 ... Scrap layer, 52 ... Piece layer, 55 ... Lance, 56 ... Electrode, 57 ... Fire wall, 59 ... Electric furnace reducing dissolution accelerator (Powder), 61 ... steel outlet, 62 ... iron outlet, B ... low temperature region.

Claims (4)

In the reduction melting accelerator for electric furnaces that promotes the dissolution of scraps by mixing with the scraps to be put into the electric furnaces and exerts a reducing action,
The electric furnace for reducing the dissolution enhancer, waste paper, heat-softenable waste plastics, thermosetting plastic waste, the multiple of the variable fuel waste and incombustible waste, mixed and solidified by compression, one side or diameter Ri Oh in the piece of 8~40mm,
The blending ratio of the electric furnace reducing dissolution accelerator includes 1 to 10% by weight of the waste paper and the thermosoftening plastic having a lower limit of 10% by weight,
It said heat softenable the weight of plastic plus, electric furnace for reducing dissolution promoter waste plastics aggregate is characterized by 80 to 99 wt% der Rukoto on the weight of the thermosetting plastic waste. In a reduction melting accelerator for an electric furnace that promotes melting of scrap by blowing into the electric furnace and exerts a reducing action,
The electric furnace for reducing the dissolution enhancer, waste paper, heat-softenable waste plastics, thermosetting plastic waste, the multiple of the variable fuel waste and incombustible waste, mixed, into pieces harden by compressing , Ri powder der you the size of 0.01~3.0mm by further crushing the piece,
The blending ratio of the electric furnace reducing dissolution accelerator includes 1 to 10% by weight of the waste paper and the thermosoftening plastic having a lower limit of 10% by weight,
It said heat softenable the weight of plastic plus, electric furnace for reducing dissolution promoter waste plastics aggregate is characterized by 80 to 99 wt% der Rukoto on the weight of the thermosetting plastic waste. Electric furnace operation characterized in that melting by arc discharge is started after alternately laminating scrap layers and piece layers made of the reduction melting accelerator for electric furnaces according to claim 1 in the electric furnace. Method. The reduction melting accelerator for an electric furnace according to claim 2 , wherein a lance is used for at least one of a low temperature area in the furnace, an observation window, a steel outlet, and a tap outlet during melting of the scrap. A method of operating an electric furnace, characterized by blowing air.

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