JPH1089639A - Disposal of shredder dust from end-of-life vehicles and home appliances in a vertical furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably blow shredder dust having a low bulk density in a form close to cotton dust into a blast furnace while preventing blockage in a pneumatic facility and hanging on a shelf in a tank. SOLUTION: A pretreatment is performed in which the material is semi-melted or melted by frictional heat and / or heating 4c of cutting or crushing 1, and is allowed to cool or quench to be shrunk and solidified 4 into particles. Further pulverize as appropriate. The granulated dust (a) subjected to the above treatment is pneumatically blown into a vertical furnace such as the blast furnace 12. EFFECT can be disposed while large quantities Moreover effectively utilized without generation of dioxin and NO _X hazardous gas components, contributes to environmental improvement, and contribute to the operating cost of the shaft furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying and processing shredder dust generated when disposing of automobiles and home electric appliances in a vertical furnace such as a blast furnace.

[0002]

2. Description of the Related Art When dismantling automobiles and home appliances, iron and copper and other metals, various synthetic resin scraps, etc. can be effectively used as recycled materials or fuels. A so-called shredder dust having a form close to cotton dust which is difficult to form is generated. Shredder dust contains various kinds of substances and is generated in Japan at about 1.2 million tons per year. In particular, the ratio of shredder dust generated from end-of-life vehicles is about 85% of all shredder dust
It is overwhelmingly overwhelming, and the amount of generation is increasing rapidly year by year as the number of vehicles owned increases.

According to the results of industrial analysis, such shredder dust components contain a large amount of volatile matter and fixed carbon in addition to moisture and ash, and have relatively large heat of combustion.
Therefore, there is a possibility of heat recovery by incineration, but when treated in an ordinary incinerator for waste disposal, harmful components caused by Cl, N and S contained in a part of plastics are generated as gas. . Therefore, shredder dust is currently to be landfilled at landfill sites.
However, available landfills have been decreasing year by year and have become a major problem. Also, since shredder dust contains a considerable amount of ash, incineration in a regular incinerator does not provide a fundamental solution to landfill shortage.

In recent years, a method has been proposed for effectively utilizing shredder dust by blowing it into a blast furnace. For example, JP-A-6-254530
The publication discloses a method of injecting shredder dust into a blast furnace through tuyere, entraining shredder dust as it accompanies the injected gas, injecting it with heavy oil such as heavy oil or coal tar, and spraying as a water slurry. (Hereinafter referred to as prior art). According to the prior art,
Since dioxin is said to be caused by Cl is heated rapidly to 1400 to 1600 ° C. After blowing not occur in the blast furnace, NO _X due to N are reduced to N while passing through the blast furnace red hot coke layer Therefore, S does not occur, and S reacts with limestone as a blast furnace auxiliary material and shifts to slag as CaS.

[0005]

According to the prior art [SUMMARY invented], it is possible to effectively handle the shredder dust without affecting the blast furnace operating conditions, to and generate harmful components such as dioxin and NO _X It can be processed harmlessly without any problem. In addition, shredder dust is iron powder, non-ferrous metal powder, inorganic powder, plastic flakes, rubber waste,
Since it contains many kinds of substances such as paint powder and cloth dust, and contains a large amount of combustibles, it can be an energy resource.

However, since the shredder dust is in a form close to cotton dust, its bulk density is as small as about 0.15 g / cm ³ , and the lumps are easily entangled with each other. It was difficult to handle during transportation. Furthermore, due to the nature of such shredder dust, when it is blown into a blast furnace by a conventional method such as the prior art, it is stored in a service hopper and blown by pneumatic as it is, or heavy oil is mixed in a mixing tank. If water is mixed with water and blown in, it will not be possible to perform stable continuous operation due to blockage in pipes, especially in distributors, curved parts and valve parts, and suspension in tanks. there were.

[0007] Accordingly, an object of the present invention is to solve the above-mentioned problems, and to occur when disposing of automobiles and home electric appliances without affecting the operation of the vertical furnace and without generating harmful components. It is an object of the present invention to provide a method for supplying and treating shredder dust in a vertical furnace such as a blast furnace.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and have obtained the following findings. As described above, the shredder dust initially has a fluffy appearance and a bulk density as small as about 0.15 g / cm ³ , but is allowed to cool after being semi-molten, or is rapidly cooled after being semi-molten. If it is granulated by this and made into a state where the bulk density is increased, then it is blown into the vertical furnace by air,
It is possible to prevent clogging in the piping and occurrence of hanging on the shelf in the storage tank.

On the other hand, while the shredder dust is stored in an outdoor yard or the like, it becomes wet and clumps and sticks to rainwater,
The transfer process and handling are difficult. Therefore, pretreatment such as cutting or crushing is required before blowing air into the vertical furnace. The shredder dust is semi-melted by the frictional heat generated at this time. Further, depending on the properties of the shredder dust at the time of receiving, the shredder dust may be completely melted during the above treatment. By causing the shredder dust to be semi-molten or melted in this way, the shredder dust can be easily reduced in volume and solidified. By performing such pre-processing, it is possible to prevent pipe clogging when shredder dust is blown into the vertical furnace.

[0010] The present invention has been made based on the above findings, and the invention according to claim 1 is based on friction generated when cutting or crushing shredder dust generated when disposing of automobiles and home electric appliances. It is semi-molten or melted by heat, and the semi-molten or molten shredder dust is shrunk and solidified into particles,
Then, the shredder dust compacted and solidified into particles is pneumatically blown into a vertical furnace.

According to a second aspect of the present invention, shredder dust generated when disposing of automobiles and home electric appliances is semi-molten or melted by heating after cutting or crushing the shredder dust. The present invention is characterized in that the shredder dust that has been melted or melted is shrunk and solidified into granules, and then the shredder dust shrunk and solidified into granules is pneumatically blown into a vertical furnace.

The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, when the semi-molten or molten shredder dust is shrunk and solidified into granules, it is rapidly cooled and formed into granules. is there.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, when the semi-molten or molten shredder dust is shrunk and solidified into granules, it is rapidly cooled and formed into granules. It is characterized in that the granular shredder dust is further pulverized to be granulated.

The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the shredder dust compacted and solidified in a granular form is charged from the furnace top of a vertical furnace. Have

[0015]

Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a process diagram illustrating an example of a method for supplying shredder dust to a vertical furnace according to the present invention, in which shredder dust received is reduced in volume and solidified to a predetermined particle size (hereinafter, referred to as “particle size”).
2 shows equipment and an operation flow for supplying a vertical furnace with pneumatic equipment after pre-processing to “granulated dust”. In the figure, shredder dust (A) is carried in from a storage yard (not shown) and crushed by a crushing device 1,
When the temperature of the material to be crushed is increased, it is appropriately cooled. Depending on the form of the shredder dust (A), the crushing device 1
Before extrusion, the mixture is extruded into a rod by an extruder (not shown) and cooled appropriately. Next, shredder dust (hereinafter referred to as “shredder dust”), which has been loosened by the separator 2 and iron scrap has been removed by the magnetic separator 3.
After being turned into "small dust (A ')"), it is temporarily stored in the storage tank 13 and charged into the melting and solidifying granulation apparatus 4 by a conveyor or the like. However, if the crushing process is only loosened, the separator 2 is not passed.

The melting and solidifying granulator 4 is for granulating the fine dust (A '), and separates into two routes P or Q depending on the form of the fine dust (A'). The route P includes a crushing / quenching device 4a and a crushing device 4c, and the route Q includes a heating / quenching device 4a.
b and a crusher 4c. The melting and solidifying granulation device 4 is a central device for reducing and solidifying the shredder dust to increase the bulk density and to form particles to a predetermined particle size.
Therefore, the processing route and the method of using the apparatus are determined according to the properties of the fine dust (A ') and the desired shape and size of the granulated dust (a), which are intermediate stages. A typical method of using the melting and solidifying granulation apparatus 4 will be described.

Case 1: Granulated dust (a) obtained by cutting the fine dust (A ') cut out from the storage tank 13 through the route P
And there is the following route. (1-1) The powder is processed by the pulverizing / quenching device 4a, and is shrunk and solidified into the granular dust (a). FIG. 2 shows a crushing / quenching device 4a.
FIG. 4 is a view for explaining a method for shrinking and solidifying the fine particle dust (A ′) into particles. Loading of small dust (A ') 41
Is supplied to a rotary pulverizer 43 provided in a pulverizing chamber 42, and the fine dust (A ') is pulverized into small pieces and becomes a semi-molten or completely molten state by frictional heat. The granulated dust discharged from the rotary crusher 43 is rapidly cooled by a cooling medium (for example, water spray) discharged from a nozzle 44, contracted and solidified into particles, and discharged from a discharge port 45.

(1-2) Even when the above-mentioned crushing and quenching device 4a does not quench and only crushes and discharges and shrinks and solidifies, the shrinkage-solidified dust 46 is crushed to a predetermined size by the crushing device 4b. Good. FIG. 3 is a principle diagram of a method of granulating the shrinkage-hardened dust 46 by the crusher 4b. The shrinkage-solidified dust 46 is cut and crushed by the rotating blade 47 rotating at a high speed, and is cooled in an air stream to obtain granulated dust (a). FIG. 2A shows the case where the temperature of the granulated dust rises due to frictional heat during pulverization but does not melt at all. FIG. This is the case where granulated dust (a) is obtained.

(1-3) After the treatment as described in the above (1-1), the granulated dust (a) may be further treated by the pulverizer 4b. Case 2: Small dust (A ′) cut out of the storage tank 13 is converted into granulated dust (a) by the route Q, and there is the following route.

(2-1) Treating with heating / quenching device 4c,
The granulated dust (a) is contracted and solidified. Figure 4 shows the heating
It is a figure explaining the method of shrinking and solidifying a small piece dust (A ') by the quenching device 4c. Strip dust (A ')
Is supplied from a charging inlet 48 onto a heating transfer belt 50 provided in a heating chamber 49, and the heated and semi-molten or completely molten dust is transported to an adjacent quenching chamber 51, where it is ejected from a nozzle 52. Cooled by a cooling medium (for example, water spray) and dispersed, the particles are shrunk and solidified into granules, and the granulated dust (a) is discharged from the discharge port 53.

(2-2) The heating and quenching device 4c of (2-1) does not rapidly cool, but only heats and discharges, and shrinks and solidifies. The shrink and solidified dust 54 is as shown in FIG. May be crushed to a predetermined size by the crushing device 4b.

(2-3) After the treatment as described in (2-1) above to obtain the granulated dust (a), it may be further treated by the pulverizer 4b. The decision on which of the above routes to select is based on the following concept.

The most cost-effective method is generally the method (1-1) of Case 1 described above, and therefore, the aim is to apply this method. First, the target particle size of the granulated dust (a) is determined to be a predetermined value: D ₀ mm or less. Now, as the rotation speed of the rotary crusher 43 and the processing time increase, the temperature of the shredder dust increases and melts, while the particle size of the crushed dust decreases as the rotation speed and the processing time increase. In such a course, the pulverization conditions are adjusted so that the particle diameter reaches the target value D ₀ mm or less, and the dust temperature at that time is a temperature T ₀ lower by a predetermined value than the melting point, and the particle diameter of the dust is adjusted. When both of the temperatures meet this condition, the dust is quenched.

If the dust temperature does not reach T ₀ even though the particle size has reached D ₀ mm or less, the rate of increase in the dust temperature is increased while suppressing the rate of increase in the pulverization rate. Conversely, if the particle size does not reach D ₀ mm or less despite the fact that the dust temperature has reached T ₀ , the rate of increase in the pulverization rate is increased while suppressing the rate of increase in the dust temperature. Adjust to

The heating / quenching device 4c of the case 2 is basically used when the material composition of the flake dust (A ') is large and the difference in melting temperature is large, or when crushing / quenching is performed. It is limited to an emergency such as when the device 4a cannot be used for repair or other reasons.

A major feature of the present invention is that a predetermined dust reduction, solidification and granulation are performed by applying the above-mentioned proper pre-processing to a dusty dust having a small bulk density such as a shredder dust. The above operation is performed by blowing the tuyere into a vertical furnace such as a blast furnace from the tuyere, so that continuous operation of the vertical furnace can be performed without any trouble without clogging of the pipes and shelf fishing in the storage tank.

The granulated dust (a) obtained as described above is charged into a sieving and separating machine 5 and one having a particle size smaller than a predetermined particle size (under a sieve) is primarily stored as shown in a route R. Store in tank 6. The granulated dust (a) having a predetermined particle size stored in the primary storage tank 6 is pneumatically transported from the service tank 7 and sent to the pneumatic device 8. The pneumatic device 8 includes a secondary storage tank 8b for preparing the supply of the granulated dust (a), a pressure equalizing tank 8c, a blowing tank 8d, and a pneumatic accumulator 8a. It is blown into the inside of the blast furnace 12 from a blowing pipe 10 installed in the blast furnace tuyere 11.

On the other hand, those having a predetermined particle size or more indicated by the route S on the sieve in the sieving and separating machine 5 are further divided into small lumps having a particle size smaller than the predetermined particle size and large lumps having a larger particle size. The lump dust is stored in the storage tank 13, the coarse crushing / cooling device 1
Alternatively, it is returned to the melting and solidifying granulation device 4 for use. on the other hand,
The lump dust is combined with a raw material charging line (not shown), which is an auxiliary equipment of the blast furnace 12, and charged together with coke from the furnace top of the blast furnace 12, or charged into a coke oven, blended in a raw material yard, Alternatively, it is provided for charging into a sintering furnace.

[0029]

Next, the present invention will be described in more detail with reference to examples. Based on the flow chart showing the method of the present invention shown in FIG. 1, after a shredder dust was preprocessed in a commercial blast furnace, a test operation of blowing from tuyere and a test operation of charging from a furnace top were performed for 7 days. Table 1 shows the operating conditions of the blast furnace.

[0030]

[Table 1]

The shredder dust (A) was treated by the crusher 1 according to the process diagram of FIG. Shredder dust (A) was heated to about 120 ° C. due to frictional heat due to crushing and was semi-melted, and thus was cooled with water. Next, this was processed by the separator 2 and the magnetic separator 3 and then charged into the melting / solidifying granulation device 4. The melting and solidifying granulation method is performed by route P,
The pulverized dust that was semi-molten by the treatment in the quenching device 4a was rapidly cooled and shrunk and solidified into granules, and the granulated and solidified dust was crushed by the crushing device 4c to obtain granulated dust (a). Then, it is treated by a sieving / separator 5, and the particle size is 6 mm.
The following items were stored in the primary storage tank 6. Next, the dust was sent from the service tank 7 to the pneumatic device 8 by pneumatic transportation, and the dust (a) was blown into the blast furnace 12 from the tuyere 11 by the blowing pipe 10. The bulk density of the granulated dust blown was 0.35 to 0.45 g / cm ³ .

Table 2 shows the blowing conditions of the granulated dust (a).

[0033]

[Table 2]

On the other hand, among the particles having a particle diameter of more than 6 mm and obtained by the treatment of the sieving / separating machine 5, lump dust having a particle diameter of 50 mm or more is stored in a predetermined amount, and then placed on a raw material charging line of the blast furnace 12 to be blasted. Charged together with coke from the furnace top of No. 12. The lump dust having a particle size of more than 6 mm to less than 50 mm was recycled to the coarse crushing / cooling apparatus 1.

The calorific value of the shredder dust blown was about 3000 kcal / kg, and the blown amount was 2.2% by weight to coke. Due to the granulation of shredder dust and increase in bulk density, no operation troubles such as clogging of pneumatic tubes due to shredder dust and shelf fishing of storage tanks occur during the continuous operation period of 7 days. There was no change in operating results as compared to normal times. Also, dioxin in blast furnace gas was converted to GC-M
In the S method, NO _X was analyzed by a chemiluminescence method, but was not detected.

[0036]

Since the present invention is constructed as described above, there is no clogging of pipes due to shredder dust or occurrence of shelf fishing in the tank, and it is transferred into the furnace without affecting the operating conditions of the blast furnace. it can be blown, moreover can be processed shredder dust without generation of dioxin and NO _X hazardous gas components. As described above, the method for treating shredder dust of waste automobiles and household electrical appliances in the vertical furnace according to the present invention has an extremely useful effect in industry.

[Brief description of the drawings]

FIG. 1 is a process diagram illustrating an example of a method for treating shredder dust in a vertical furnace according to the present invention.

FIG. 2 is a view for explaining a method of shrinking and solidifying fine particle dust into particles by a pulverizing / quenching device.

FIG. 3 is a principle diagram of a method of granulating shrinkage-solidified dust by a pulverizer.

FIG. 4 is a view for explaining a method of shrinking and solidifying fine dust into particles by a heating / quenching device 4c.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crushing apparatus 2 Separator 3 Magnetic separator 4 Melting / solidification granulation apparatus 4a Pulverizing / quenching apparatus 4b Pulverizing apparatus 4c Heating / quenching apparatus 41 Loading port 42 Pulverizing chamber 43 Rotating pulverizer 44 Nozzle 45 Discharge port 46 Shrinkage solidified dust 47 Rotation Blade 48 Loading inlet 49 Heating chamber 50 Heat transfer belt 51 Rapid cooling chamber 52 Nozzle 53 Discharge port 54 Shrinkage-solidified dust 5 Sieving / separating device 6 Primary storage tank 7 Service tank 8 Pneumatic device 8a Accumulator 8b Secondary storage tank 8c Pressure tank 8d Blow tank 9 Accumulator 10 Blow pipe 11 Tuyere 12 Blast furnace 13 Storage tank

──────────────────────────────────────────────────の Continuation of front page (51) Int.Cl. ⁶ Identification code FIF23G 5/44 ZAB B09B 3/00 ZAB 7/00 ZAB 303L (72) Inventor Minoru Asanuma 1-2-1 Marunouchi, Chiyoda-ku, Tokyo No. Nippon Kokan Co., Ltd. (72) Inventor Hiroshi Yamada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Nippon Kokan Co., Ltd. (72) Inventor Masuhiro Fujii 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun Inside Honko Co., Ltd. (72) Inventor Kazuma Wakimoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd.

Claims (5)

[Claims] 1. Shredder dust generated when disposing of automobiles and home electric appliances is semi-molten or melted by frictional heat generated when cutting or crushing, and thus semi-molten or molten. A method for treating shredder dust from waste automobiles and household electrical appliances in a vertical furnace, comprising shrinking and shrinking the shredder dust into granules, and then pneumatically blowing the shredder dust into the vertical furnace. 2. Shredder dust generated when disposing of automobiles and home electric appliances is cut or crushed and then heated or semi-molten or melted. A method for treating shredder dust from waste automobiles and household electrical appliances in a vertical furnace, comprising shrinking and solidifying the shredder dust into granules, and then pneumatically blowing the shredder dust into the vertical furnace. 3. The shredder dust treatment according to claim 1 or 2, wherein when the semi-molten or molten shredder dust is shrunk and solidified into granules, it is rapidly cooled and formed into granules. Method. 4. A method for shrinking and solidifying the semi-molten or molten shredder dust into particles, wherein the particles are rapidly cooled and formed into granules, and the granulated shredder dusts thus formed are granulated by further pulverization. 3. A method for treating shredder dust from waste automobiles and household electric appliances in a vertical furnace according to claim 1 or 2. 5. The waste vehicle and household electrical appliance according to claim 1, wherein the shredder dust compacted and solidified in a granular form is charged from the top of the vertical furnace. A method of treating product shredder dust in a vertical furnace.