JP2003064423A - Combustion improving agent containing raw metal, and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a combustion improving agent containing a raw metal and a manufacturing method therefor in which the shredder dust produced by shredding the remainder generated by removing components to be recycled from cars, household appliances and office appliances can be disposed, and effectively used, the running cost of an iron melting furnace can be reduced by using the shredder dust therein, the recycling ratio can be improved and the cost can be reduced. SOLUTION: Metal pieces 1 such as ferrous chips are solidified with the remainder of the shredder dust 4 removing unnecessary metal composition therefrom as a binder, and the binder of 10-60 wt.% is blended therein. This solidified stuff can be used for the raw metal which is also used for the combustion improving agent in an iron melting step using an electric furnace, or the like. The shredder dust can be effectively utilized, and the recycling ratio of iron chips is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary combustion material suitable for use in an iron melting process using, for example, an electric furnace,
The manufacturing method is related.

[0002]

2. Description of the Related Art In recent years, with the increase of waste waste, the increase in the amount of incineration has become a problem, and at the same time as solving the problem, the waste waste is effectively utilized. Attention has been focused on so-called solid waste fuel, which is made into a solid fuel by solidifying and shaping it into a rod shape of an appropriate size.

This solid waste fuel is obtained by crushing combustible waste including raw waste, drying it, selecting it, and then molding it. It is a heat source for cooling and heating, hot water supply or hot water pools, and heat source for power generation. Moreover, it is being used for fuels for various industries.

[0004]

By the way, from shredder dust generated from the industrial world, that is, from wastes such as automobiles, home appliances, and office equipment, the residue after removing the parts used for recycling the raw materials is crushed. Things are
The main component is various plastics, but other various materials such as iron, various non-ferrous metals, and wood-based materials are mixed, and such shredder dust is a so-called management type of industrial waste. It belongs to waste, and its disposal method must be landfilled or incinerated at a designated place.In recent years, compared to ordinary combustible waste, the location of the disposal site has become better. It's getting harder.

The object of the present invention is to solve the problem of the disposal of such shredder dust and to make effective use of it, and also to reduce the running cost by using it in an iron melting furnace, and thus the recycling rate. It is to provide an auxiliary combustion material containing a metal raw material and a method for producing the same, which can contribute to the improvement of fuel consumption and cost reduction.

[0006]

In the auxiliary burner containing a metal raw material of the present invention, iron-based metal flakes are solidified by a binder containing plastic as a main component, and the binder is an automobile, an electric appliance, an office work. Unnecessary metal components are removed from shredder dust obtained by crushing the residue after removing the parts to be recycled from the waste such as equipment, and the mixing ratio of the binder is the metal-containing auxiliary combustion material. It is characterized by being in the range of 10 to 60 parts by weight out of 100 parts by weight (claim 1).

Here, in the auxiliary burner containing a metal raw material of the present invention, it is desirable that the metal flakes are made of iron scrap as a raw material and have a size equal to or smaller than a size capable of passing through a 50 mm sieve (claim 2).

Further, the method for producing a metal-containing auxiliary combustion material of the present invention is the method for producing a metal-containing auxiliary combustion material according to claim 1 or 2, which is recycled from wastes such as automobiles, home appliances and office equipment. After crushing the residue after removing the parts to be used in the process to a size that allows it to pass through a 16 mm sieve, (more preferably, passing through an 8 mm sieve and
After crushing to a size that does not pass through the sieve, and then removing unnecessary metal components, mix and stir the iron-based metal strips at the required ratio and pressurize in the mold to form the desired shape. It is characterized by (claim 3).

In the manufacturing method according to the present invention, it is preferable that the mixture is heated when being pressurized in the mold (claim 4).

The present invention reuses shredder dust, which is difficult to locate in the repository, as an energy source without providing it for disposal such as incineration, and at the same time, uses it as an auxiliary combustion material for the melting process of metal in an electric furnace or the like. Further, the present invention aims to achieve the intended purpose by containing iron metal particles to be melted therein.

That is, the metal-containing raw material auxiliary combustion material of the present invention is made into an auxiliary combustion material and a metallic raw material by solidifying the iron-based metal pieces using shredder dust, which requires disposal, as a binder. By adopting cutting scraps and the like, it is possible to contribute not only to energy cost but also to material cost reduction. In addition, since the raw material of the binder in the present invention removes unnecessary metal components from the shredder dust, it is possible to suppress the influence on the quality of the iron that is melted and commercialized.

The shredder dust has a lower heating value of 17,000, as is clear from the analysis results described later.
It is stable with a high calorific value of about J / g or more and can be a fuel with excellent combustibility. Further, the metal-containing auxiliary combustion material according to the present invention in which iron pieces are bound can be conveyed using a magnet, and is permanently installed in an electric furnace or the like in the iron melting step without separately providing a dedicated conveying means. There is an advantage that it can be easily transported by a transporting means using a magnet.

Here, in the present invention, the mixing ratio of the binder is 10 out of 100 parts by weight of the metal-containing raw material combustion-supporting material.
If it is less than the weight part, it becomes difficult to bind the metal strip,
On the other hand, when it exceeds 90 parts by weight, the role as a metal raw material becomes weak, and it is difficult to convey by a magnet, which is not preferable.

Further, as in the invention according to claim 2, the size of the metal strip to be bound is such that the size which passes through the 50 mm sieve, that is, the particle size of 50 mm is the upper limit, so that the handling property at the time of production can be improved. In addition, dispersibility in the binder and easiness of binding are preferable, and if the metal strip is larger than that, binding with the binder becomes difficult, or damage after solidification is not preferable.

The metal-containing raw material-assisted combustion material according to the present invention can be easily manufactured by employing the manufacturing method of the present invention described below.

That is, in the method for producing an auxiliary combustion material containing a metal raw material of the present invention, by crushing waste materials such as automobiles, home electric appliances and office equipment, which are binder raw materials,
After shredder dust having a size less than that which can pass through a 16 mm sieve, unnecessary metal components are removed, and then the binder raw material and metal strips are mixed in the above-mentioned mixing ratio and pressurized in a mold to a predetermined size. Shape to shape. The pressurization may be performed cold as in the invention according to claim 3, or may be performed while heating as in the invention according to claim 4.

When pressurizing cold, the required pressure is 2 t / cm ² or more. When pressurizing while heating, the heating temperature is 220 to 255 ° C. to melt the plastic component. By that, 5-10kg
It becomes possible to mold at a pressure of / cm ² .

A more preferable range of the size of the shredder dust before removing the unnecessary metal components is such a size that the shredder dust passes through the 8 mm sieve and does not pass through the 6 mm sieve as described above. By crushing and subjecting to wind sorting, specific gravity sorting and magnetic sorting, metal components can be separated and collected very efficiently.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. FIG. 1 is a process chart showing an example of a process for producing a metal-containing auxiliary combustion material according to the present invention by applying the method of the present invention.

In this example, an example of a process for producing an auxiliary combustor to be charged into the furnace in a step of melting iron in an electric furnace or the like, the auxiliary combustor containing a metal raw material containing iron flakes is shown. And the cutting scraps 1 are used as the iron pieces.

The shredder dust raw material 2 is obtained by removing recyclable parts from waste materials such as automobiles, home electric appliances, office equipment, etc., and is supplied to the shredding treatment step 3 using a shredder. In this crushing treatment step 3, if necessary, re-crushing treatment is carried out, and crushing is performed to a size of not more than a size of passing through a 16 mm sieve, more preferably of a size of passing through an 8 mm sieve and not passing through a 6 mm sieve. Generates shredder dust 4.

The shredder dust 4 is then sent to the sorting process 5, and by combining the sorting processes by the wind sorter, the specific gravity sorter and the magnetic sorter,
Iron and non-ferrous metal components are removed. The size of the shredder dust 4 is in the above-mentioned preferable range, that is, 8 mm.
By passing through a sieve and not passing through a 6 mm sieve, it is possible to efficiently separate metal components such as copper and aluminum during specific gravity sorting, especially in the case of shredder dust that contains a relatively large number of electrical components.・ Can be collected.

Then, the shredder dust 4'after the selection is mixed with the above-mentioned iron cutting dust 1 in a mixing treatment step 6
Sent to. The mixing ratio of both components at this time is the cutting waste:
Shredder dust = 9: 1 to 4: 6, preferably a ratio of cutting waste: shredder dust = 7: 3,
Stir and mix with a stirrer substantially uniformly. In addition, cutting waste 1
Depending on the state (size), the particles may be crushed to an appropriate size by the crushing process 10 if necessary.

Next, the mixture 7 consisting of the cutting waste 1 and the shredder dust 4'after selection is sent to the compression solidification treatment step 8. In the compression solidification treatment step 8, the mixture 7 is inserted into a mold having a heating function, and the mixture 7 is compressed from above and below by a hot plate to heat and pressurize the mixture 7. By setting the heating temperature of the mold and the hot plate to 220 to 255 ° C., the plastic which is the main component of the shredder dust 4 ′ is melted, and the pressing force required for molding is 5 to 5.
10 kg / cm ² is sufficient. By cooling and solidifying, 70% by weight of iron cutting dust 1 and 30% by weight of shredder dust 4 ′ are used as binder raw materials to obtain the iron flakes-containing auxiliary combustion material 9.

Regarding the shape of the auxiliary combustion material 9 after molding,
Although not particularly limited, as shown in the perspective view of FIG. 2, a disk shape has a good stacking property during storage, and is conveyed by using a magnet as described later. In this case, the workability becomes good, and further, the efficiency at the time of charging into an electric furnace or the like for combustion becomes good, which is desirable. Regarding the dimensions in the case of such a disc shape, the diameter D is about 100 to 1000 mm, and the height (thickness)
H is about 50 to 100 mm, diameter D and height (thickness)
It is preferable that the H and the H are changed so as to have a substantially proportional relationship with each other within the above range.

According to the iron flakes-containing auxiliary combustion material 9 in this embodiment, since it contains 70% by weight of iron, it can be carried by a carrying means using a magnet, and an electric furnace or the like can be used. By using it as an auxiliary combustion material in the iron melting process, its handleability is good,
It is possible to reduce energy costs and raw material costs at the same time.

[Table 1] shows the results of analysis of the components and the amount of heat generation of the two randomly selected shredder dusts. The analysis method of each analysis item in [Table 1] is as follows.
The CHN coder method was used for the carbon content, hydrogen content and nitrogen content, the constant weight at 105 ° C. was used for the water content, and JIS M8814 was used for the higher heating value.

As is clear from [Table 1], the carbon content is around 50%, the calorific value is low and stable at about 17,000 J / g, and therefore the combustion improver of the present invention has excellent flammability. In addition to the above, there is also an advantage that a suitable amount of carbon is supplied by being adopted in the iron melting process.

[0029]

[Table 1]

Here, in the above-mentioned embodiments, the example in which the cutting scraps are adopted as the iron pieces is shown, but it goes without saying that the iron scraps of other forms can be used, and the cutting scraps having a relatively large size are used. When using large iron scraps, it is preferable to use a crushed product that is smaller than the size that can pass through a 50 mm sieve in order to prevent dispersibility and handling in the mixing step with the binder raw material, and to prevent damage to the post-combustion material after solidification. It is desirable for planning.

Further, in the above-mentioned embodiment, the material was pressed while being heated in the compression solidification treatment step.
It can be solidified by pressing cold without heating.
However, in that case, the pressure required for solidification is 2 t / cm ²
That is all.

[0032]

Industrial Applicability As described above, according to the present invention, unnecessary metal components are removed from shredder dust obtained by crushing a residue obtained by removing parts to be recycled from wastes of automobiles, home appliances, and office equipment. As a binder raw material, iron-based metal pieces are bound, and the blending ratio of the binder is set to 10 to 60% by weight of the whole. By using it as a material and a raw material, both energy cost reduction and raw material cost reduction can be achieved, and at the same time, shredder dust, which is difficult to dispose of, can be effectively utilized.

Further, by using iron scraps such as cutting scraps as the metal strips, the effect of reducing the raw material cost is further enhanced.

[Brief description of drawings]

FIG. 1 is a process chart showing an example of a process of producing a metal-containing auxiliary combustion material according to the present invention by applying the method of the present invention.

FIG. 2 is a perspective view showing an example of a metal raw material-containing auxiliary combustion material according to an embodiment of the present invention formed by the process of FIG.

[Explanation of symbols]

1 cutting waste 2 Shredder dust raw materials 3 crushing process 4 shredder dust 4'shredder dust from which unnecessary metal components are removed 5 Sorting process 6 Mixing process 7 mixture 8 Compression and solidification process 9 Iron flakes-supporting material 10 Crushing process (for metal)

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Claims (4)

[Claims] 1. An iron-based metal strip is hardened by a binder containing plastic as a main component, and the binder raw material removes parts to be recycled from wastes such as automobiles, electric appliances and office equipment. The unnecessary metal component is removed from the shredder dust obtained by crushing the residue after the crushing, and the mixing ratio of the binder is in the range of 10 to 60 parts by weight based on 100 parts by weight of the metal-containing auxiliary combustion material. An auxiliary combustion material containing a metal raw material characterized by being present. 2. The metal strip is made of iron scrap as a raw material, and is 50 m in length.
The auxiliary combustion material containing a metal raw material according to claim 1, which has a size equal to or smaller than a size of passing through an m sieve. 3. The method for producing an auxiliary combustion material containing a metal raw material according to claim 1 or 2, wherein the residue after removing parts to be recycled from wastes such as automobiles, home appliances and office equipment, Mixing and stirring iron-based metal strips at a required ratio into a product that has been crushed to a size that can pass through a 16 mm sieve and then removed unnecessary metal components, and pressed in a mold to form the desired shape. A method for producing an auxiliary combustion material containing a metal raw material. 4. The method for producing a metal-containing auxiliary combustion material according to claim 3, wherein heating is performed when pressure is applied in the mold.