JP2934828B2 - How to treat shredder dust - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residual residue obtained by crushing used automobiles, household electric appliances and the like with a shredder and recovering a main part of iron and non-ferrous metal, and generated in the above-mentioned processing step. The present invention relates to a method for treating shredder dust such as dust collected.

[0002]

2. Description of the Related Art Conventionally, waste such as used automobiles and home electric appliances is shredded by a shredder, iron contained in a magnetic separator is recovered, and further, a non-ferrous metal separator using a manual or moving magnetic field. Separated and recovered most of the non-ferrous metals. Then, it is usual that the residual residue and the shredder dust which is dust collected in the above-mentioned process are landfilled. However, if the shredder dust such as the residue and dust collected is landfilled as it is, there is a risk that heavy metals such as lead contained in the shredder dust may be eluted. Therefore, a managed landfill that completely prevents elution of harmful components. It is obliged to process in.

[0003]

[Problems to be solved by the invention]
Since the management standards for heavy metals such as lead have become stricter since 1998, there has been a problem that landfill disposal at the above-mentioned managed landfill site is very costly. Therefore, the present inventors have devised a method of treating shredder dust in which cement, water, and the like are added to shredder dust, mixed and solidified, and elution of contained harmful components is prevented. However, in this process, when the present inventors put shredder dust, an appropriate amount of cement and water, etc. in a pug mill and mix them, fine wires of copper, stainless steel, etc. contained in the shredder dust are wound around the blade and used for a long time. As a result, there arises a problem that the blade is swollen by the wrapped thin wire, and the stirring process cannot be performed. Here, if the above-mentioned pug mill is used for an appropriate period of time and the blades are cleaned to remove the attached fine lines, repeated use is possible, but the attached fine lines are strongly wound around the blades, and the cement is hardened inside. Therefore, the work of removing the wrapped fine wire was extremely labor-intensive.

[0004] The present invention has been made in view of such circumstances, and less harmful substances are eluted, and it is easy to treat shredder dust containing fine wires.
An object of the present invention is to provide a method for treating shredder dust that does not need to be disposed of and can be used for other purposes such as building materials.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The method for treating shredder dust described in the above is a method of shredding waste such as used automobiles and home electric appliances with a shredder, and recovering the remaining residue of main parts of ferrous and non-ferrous metals and / or collection generated in the above-mentioned treatment process. A method for treating shredder dust comprising dust dust, wherein a first step of charging the shredder dust with a carbonating agent such as lime, sodium carbonate, and sodium hydrogen carbonate and cement and kneading the mixture in a kneading vessel; A second step of adding and mixing aluminum sulfate and water in the shredder dust in which the carbonating agent and cement are kneaded, and further comprising the carbonating agent, cement, aluminum sulfate, and water in the shredder dust. 1 to 4 parts by weight, 3 to 20 parts by weight, 1 to 4 parts by weight, 10 to 100 parts by weight
It is in the range of 30 parts by weight.

Further, in the method for treating shredder dust according to claim 2, in the method for treating shredder dust according to claim 1, a hydroxylating agent such as aluminum hydroxide or slaked lime is further added in the first step. The carbonating agent is added in an amount of 1 to 4 parts by weight based on 100 parts by weight of the shredder dust. According to a third aspect of the present invention, in the processing method of the first or second aspect, the kneading container is a tiltable or fixed rotary mixer having a stirring blade therein.

Here, when a carbonating agent such as lime, sodium carbonate, sodium hydrogencarbonate or the like is added to the shredder dust, the amount of addition is preferably 1 to 4 parts by weight based on 100 parts by weight of the shredder dust. It is desirable.
This is because if the amount is less than 1 part by weight with respect to 100 parts by weight of the shredder dust, it becomes difficult to form a complex salt, and the elution of heavy metals tends to be prevented. On the other hand, when the addition amount is shredder dust 100
If the amount is more than 4 parts by weight with respect to part by weight, the effect will not be exhibited as compared with the added amount, and the processing cost will rise.

When a pH adjuster such as aluminum sulfate is added to the shredder dust, the amount of the pH adjuster is preferably 1 to 4 parts by weight based on 100 parts by weight of the shredder dust. This is because if the amount of addition is less than 1 part by weight with respect to 100 parts by weight of shredder dust, there is a tendency that the complex salt cannot be stabilized in a wide pH range. On the other hand, if the added amount exceeds 4 parts by weight with respect to 100 parts by weight of the shredder dust, the effect will not be exhibited as compared with the added amount, and the processing cost will increase. is there. In addition, when adding a pH adjuster to shredder dust, one or two of a carbonating agent or a hydroxylating agent is used.
The amount of addition of the species or more is the same as described above.

When cement and water are added to solidify shredder dust, the amount of cement added is 3 to 20 parts by weight per 100 parts by weight of shredder dust, and the amount of water depends on the amount of cement added. Is preferably 10 to 30 parts by weight with respect to 100 parts by weight of shredder dust. If the amount of cement is less than 3 parts by weight with respect to 100 parts by weight of the shredder dust, it becomes difficult to make the shredder dust alkaline, it becomes difficult to prevent the elution of heavy metals, and the strength of the solidified material tends to be insufficient. Because it appears. If the amount of cement exceeds 20 parts by weight based on 100 parts by weight of shredder dust, the processing cost increases.

Further, the amount of water added is shredder dust 1
If the amount is less than 10 parts by weight with respect to 00 parts by weight, it is difficult to sufficiently mix the cement, the cement cannot be spread over the entire shredder dust, and the elution of heavy metals becomes difficult. On the other hand, if the added amount of water exceeds 30 parts by weight with respect to 100 parts by weight of shredder dust, the amount of water is too large compared to the amount of cement, and the time until the solidification becomes longer, or the solidified solid is soft and difficult to carry. This is because a tendency appears. In the method for treating shredder dust according to the present invention, for example, when adding a powdery substance and a liquid substance, it is preferable to add the powdery substance first, knead it sufficiently, and then add the liquid substance.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. First, processing equipment used for a method for processing shredder dust according to an embodiment of the present invention will be described. Here, FIGS. 1A and 1B are a plan view and a side view of a main part of a processing facility used for a method for processing shredder dust according to an embodiment of the present invention, respectively. As shown in FIGS. 1 (a) and 1 (b), a processing facility 10 used in a method for processing shredder dust according to an embodiment of the present invention includes a raw material storage yard 13 for storing shredder dust, and a raw material storage yard. Passage 1 to the left of 13
9, a tiltable rotary mixer 11 to be described later.
And a kneaded material storage yard 18 for storing the kneaded material discharged from the slag, and furthermore, a shredder dust, sodium carbonate, which is an example of a carbonating agent, is installed on a raised floor 22 adjacent to the near side of the kneaded material storage yard 18. And a kneading means 33 for kneading aluminum sulfate as an example of a pH adjuster, blast furnace cement as an example of cement as a solidifying material for solidification, and water. Hereinafter, these will be described in detail.

The kneading means 33 kneads the shredder dust and the like, and after the kneading, discharges the kneaded material to the kneaded material storage yard 18; Granular sodium carbonate (or sodium carbonate (Na ₂ CO ₃ )) is supplied to the cement supply means 14 for supplying the blast furnace cement and the tiltable rotary mixer 11.
, A sulfuric acid band supply means 16 for supplying liquid aluminum sulfate (or a sulfuric acid band (Al ₂ (SO ₄ ) ₃ )) to the tiltable rotary mixer 11. And a water supply means 17 for supplying water to the rotary mixer 11.

The tiltable rotary mixer 11 includes a kneading container 11a having a screw blade (not shown) as one example of one or more stirring blades on the inner surface thereof, and a kneading container 11a.
a supporting leg 11b that tiltably and rotatably supports a;
Power transmission means 1 such as a belt or a chain
1d, a rotary drive unit 11c composed of an electric motor or the like, and a tilt drive unit (not shown) composed of an electric motor or the like for tilting the kneading container 11a via a power transmission unit (not shown) such as a speed reducer. ). In addition, a funnel-shaped hopper that prevents the shredder dust or the like from overflowing when the shredder dust or the like is put into the kneading container 11a is provided on a stand 23 that is assembled with a steel frame or the like upright before the tiltable rotary mixer 11. 25 is supported at the upper opening end of the kneading container 11a so as to be detachable and retractable when the kneaded material is discharged.

In addition, a limit switch LS ₁ (not shown) that stops the kneading container 11a at a position inclined by about 20 ° from the upright state in order to put aluminum sulfate or water into the kneading container 11a, In order to discharge the kneaded material kneaded in the kneading container 11a to the kneaded material storage yard 18, a limit switch LS ₂ (not shown) is stopped at a position further inclined by about 50 ° from the above inclined state, and further,
At the end of kneaded material discharge, the kneading container 11a is set upright.
A limit switch LS ₃ (not shown) for stopping at the position where the above-described tilted state is changed to the upright state is attached. In FIG. 1, reference numeral 22 a denotes an installation floor for installing the tiltable rotary mixer 11 arranged on the side edge of the kneaded material storage yard 18 of the base 22.

The cement supply means 14 includes a cement hopper 14a installed in front of the tiltable rotary mixer 11 for storing blast furnace cement, and a cement feed pipe 14b from the cement hopper 14a to the tiltable rotary mixer 11. And a feeding means (not shown) such as a blower for feeding blast furnace cement. On the other hand, the sodium carbonate supply means 15
Like the cement supply means 14, the tiltable rotary mixer 11
Carbonated hopper 15 for storing sodium carbonate, which is installed immediately before and right next to the cement hopper 14a.
and a supply means (not shown) such as a blower for supplying sodium carbonate from the sodium carbonate hopper 15a to the tiltable rotary mixer 11 via the sodium carbonate supply pipe 15b. Each hopper 14a, 15a or each supply pipe 14b, 15b has an openable and closable gate (not shown) for adjusting the amount of cement and the amount of sodium carbonate fed to the tiltable rotary mixer 11. Installed.

The sulfuric acid band supply means 16 includes a sulfuric acid band storing tank 16a for storing aluminum sulfate, which is installed on an installation floor 22b on the left side of the cement hopper 14a.
The tiltable rotary mixer 11 is installed in the middle of a sulfate band supply pipe 16b that is piped from the lower part of the sulfate band storage tank 16a to the vicinity of the tiltable rotary mixer 11.
And a metering pump (not shown) for adjusting the amount of aluminum sulfate to be fed. On the other hand, the water supply means 17 is provided in the water storage tank 1 for storing water, which is provided on the right of the sulfuric acid band storage tank 16a.
7a, an auxiliary tank 24 installed on the gantry 23 and storing one batch of water to be fed from the water storage tank 17a to the tiltable rotary mixer 11, and a retractable water installed on the tilting side of the kneading vessel 11a. A nozzle (not shown).

The upstream water supply pipe 17b, which is connected from the lower part of the water storage tank 17a to the auxiliary tank 24, has
A supply valve (not shown) such as a solenoid valve for adjusting the amount of water to be supplied to the auxiliary tank 24 is attached, while a downstream water supply pipe (not shown) provided from the auxiliary tank 24 to the water nozzle. A discharge valve (not shown) such as a solenoid valve for adjusting the amount of water to be supplied to the tiltable rotary mixer 11 is attached to. In the raw material storage yard 13,
A wheel loader 20 for collecting the shredder dust in one place is provided, while a passage 19 is provided while scooping up the shredder dust in the raw material storage yard 13,
A hydraulic excavator 21 is provided for putting the mixture in the kneading container 11a. Further, an uphill path 19 a for allowing the hydraulic shovel 21 to ascend to the passage 19 is formed in front of the passage 19. Although not shown, a control panel for controlling the kneading means 33 is provided on the base 22.

Next, a method for treating shredder dust according to an embodiment of the present invention will be described. here,
FIG. 3 is an explanatory view of the process of generating shredder dust used in the method for treating shredder dust according to one embodiment of the present invention, and FIGS. 4 (a) to 4 (d), 5 (a) to 5 (c), and FIG.
(A), (b) is a flowchart of the shredder dust processing method. As shown in FIG. 4A, in the method for treating shredder dust according to one embodiment of the present invention, a step (S1) of charging shredder dust into a kneading vessel 11a, and a step of mixing blast furnace cement and sodium carbonate in a kneading vessel 11a. (S2), kneading shredder dust, blast furnace cement and sodium carbonate (S3), and kneading vessel 11a with aluminum sulfate and water.
(S4), a step of kneading shredder dust, blast furnace cement, sodium carbonate, aluminum sulfate and water (S5), and a step of discharging the kneaded material from the kneading vessel 11a (S6). Hereinafter, these will be described in detail.

First, the shredder dust collected at one place of the raw material storage yard 13 by the wheel loader 20 is scooped up by a hydraulic shovel 21 and charged into the kneading container 11a (S1). The shredder dust used here is, for example, as shown in FIG. 3, after crushing waste 28 such as automobiles and home electric appliances with a pre-shredder 29,
The dust obtained by crushing with the shredder 30 and further removing the nonferrous metal from the dust from which the iron swarf has been removed with the magnetic force sorter 31 and the dust generated in the above-mentioned processing process with the nonferrous metal removed by the dust collector 34. Dust.

Next, after the shredder dust has been charged, as shown in FIG. 4B, the start button of the control panel (not shown) is turned on (S7), and the subsequent processing is started. . First, when it is confirmed whether the kneading vessel 11a is in an upright state (S8), the introduction of blast furnace cement and sodium carbonate is started (S2). Here, as shown in FIG. 4C, each hopper gate of the cement hopper 14a and the sodium carbonate hopper 15a is opened, and each blower is turned on, so that the blast furnace cement and the sodium carbonate are discharged. Input is started. At the same time, the timer T ₁ of the to define the input of one batch of blast furnace cement and sodium carbonate is started (S9), the time-up is started to be confirmed (S10). And the timer T
_When the time-up of ₁ is confirmed (S10), each hopper gate is closed and each blower is turned off.
Then (S11), the charging of the blast furnace cement and the sodium carbonate is completed.

Next, kneading of shredder dust, blast furnace cement and sodium carbonate is started (S3). Here, as shown in FIG. 4 (d), simultaneously with the time preset by the timer T ₁ (S10), rotary drive means 11c of the tilting rotary mixer 11 is "on". At the same time, the timer T ₂ is started for defining the shredder dust, kneading time of blast furnace cement and sodium carbonate (S1
2), the time-up starts to be confirmed (S13).
Then, the time-up of the timer T ₂ is confirmed (S
13), the rotation driving means 11c is turned off (S1).
4) Then, the first kneading is completed.

Next, charging of aluminum sulfate and water is started (S4). Here, as shown in FIG.
Simultaneously with time up of the timer T ₂ (S13), the tilting drive means tilting rotary mixer 11 is "on" (S15). Then, kneading container 11a of the tilting rotary mixer 11 is tilted to the water nozzle side, the limit switch LS ₁ to be stopped at a position where the kneading container 11a from the upright state inclined about 20 ° to "on" ( At S16), the tilt drive unit is turned off (S17). At the same time, the water nozzle is advanced toward the tiltable rotary mixer 11 by the reciprocating means (not shown) (S18), and then the discharge valve attached to the downstream water supply pipe is opened (S1).
9) Water is supplied from the auxiliary tank 24 to the tiltable rotary mixer 11. Then, when it is confirmed that the level meter of the auxiliary tank 24 is "Low" (S20), the discharge valve is closed (S21), and thereafter, the water nozzle is retracted to the original position (S22). Then, the introduction of water is completed.

On the other hand, the timer T ₂ times out (S 1
3) At the same time, as shown in FIG. 5 (c), together with the metering pump is turned "on", and start timer T ₃ for defining the supply amount of aluminum sulfate (S26), the time-up is confirmed Is started (S27). And
Time up of the timer T ₃ is confirmed (S27)
Then, the metering pump is turned off (S28), and the charging of the aluminum sulfate is completed. In addition, in the empty auxiliary tank 24, as shown in FIG. 5B, the supply valve of the upstream water supply pipe 17b is set to "open" (S23).
After it is confirmed that the level meter of the auxiliary tank 24 is “High” (S24), the supply valve is closed (S2).
5) Water supply is completed. Next, kneading is started again (S5). Here, as shown in FIG. 6 (a), simultaneously with the time preset by the timer T ₃ (S27), the rotation drive means 11c of the tilting rotary mixer 11 is "on", the second time of the kneading time and timer T ₄ start for defining (S29), the time-up starts to be confirmed (S30). The timeout of the timer T ₄ is confirmed (S30), rotation driving means 11c is "off" Te (S31), all the kneading is completed.

Next, discharge of the kneaded material is started (S
6). Here, as shown in FIG. 6 (b), first, at the same time as the time preset by the timer T ₄ (S30), the tilting drive means tilting rotary mixer 11 is "on" (S3
2). Then, the kneading vessel 11a further tilted in water nozzle side, and the limit switch LS ₂ to "ON" (S33) for stopping at a position further to about 50 ° inclined from the inclined state of the tilting drive means "off" is with the, and the timer T ₅ is started for defining the discharge time of the kneaded material (S34), the time-up is started to be confirmed (S35). The timeout of the timer T ₅ is verified to (S35), the tilting drive unit is turned "on", and homing in the upright state (S36). next,
The "on" the limit switch LS ₃ for tilting rotation mixer 11 is stopped at a position upright (S3
7), the tilt drive unit is turned off (S38), and all the processes are completed.

As described above, in the method for treating shredder dust according to one embodiment of the present invention, the engine oil, the battery, the fuel tank and the like are contained in the shredder dust by shredding the waste 28 such as an automobile. Even if a substance containing a large amount of lead such as lead is contained, heavy metals such as lead are hardly eluted by placing the shredder dust in an alkaline atmosphere. Further, aluminum sulfate and sodium carbonate react with the heavy metal to form a complex salt (take in the heavy metal), so that the elution of the heavy metal is further prevented. Further, the shredder dust can be solidified with cement and water, so that transportability and handleability when transporting from the kneaded material storage yard 18 to a managed landfill site or the like can be improved. Also, a tiltable rotary mixer 11 having a screw blade inside for shredder dust or the like.
Even if the shredder dust contains a wire such as a copper wire or a stainless steel wire, it can prevent entanglement with the conventional blades and improve workability, while the wire material is contained in the kneaded material. By containing, a more solidified product can be formed, and in addition to disposal, it can be used for other purposes such as building materials.

[0026]

Next, the results of confirmation tests of the method for treating shredder dust of the present invention will be described. First, as shown in Table 1, with respect to 100 parts by weight of shredder dust, 1.67 parts by weight and 1.11 parts by weight of sodium carbonate as an example of a carbonating agent and slaked lime as an example of a hydroxylating agent were added.
1. parts by weight of aluminum sulfate which is an example of a pH adjuster
78 parts by weight, 5.56 parts by weight of blast furnace cement as an example of cement as a solidifying material, and 10 parts by weight of water were added and kneaded. As a result, in the shredder dust which was not subjected to the method for treating shredder dust of the present invention, the dissolved ion concentration of lead as high as 1.36 ppm was detected in the shredder dust as it was, but the method for treating shredder dust of the present invention was applied. The resulting kneaded material has an extremely low eluted ion concentration of 0.062 ppm, which is the control standard value (0.3
ppm) can be sufficiently cleared.

[0027]

[Table 1]

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments, and all changes in conditions without departing from the gist are within the scope of the present invention. For example, in the present embodiment, blast furnace cement was used as an example of cement as a solidifying material,
In addition, ordinary cement or the like can be used. Further, a fixing agent may be added. Further, if necessary, ferrous sulfate can be added and kneaded. Further, in the present embodiment, the solidification is performed using the cement and the water, but the solidification is not necessary.

It is also possible to use a tiltable rotary mixer 35 as shown in FIG. In FIG. 2, reference numeral 36 denotes a pot-shaped kneading container having a screw blade (not shown) as an example of one or more stirring blades on its inner surface, and reference numeral 37 denotes a U which rotatably supports the kneading container 36. Reference numeral 37a denotes a tilting axis of the support 37,
Reference numeral 8 denotes an electric motor attached to the side of the support 37 and is an example of a rotation driving means for driving the kneading container 36 to rotate. Reference numeral 39 denotes a pair of supports for tiltably supporting the kneading container 36 via the support 37. The leg 40 is the tilting axis 3 of the support 37.
An electric motor, which is an example of a tilt drive source that transmits a tilt drive force to a gear 37b attached to 7a via a speed reducer 41, reference numeral 42 denotes a connecting body connecting the pair of support legs 39, and reference numeral 43 denotes a pair of support members. A pair of bases respectively disposed below the legs 39, reference numeral 44 is a stopper. Although not shown, sprockets are attached to the lower peripheral wall of the kneading container 36 and the main shaft of the electric motor 38, respectively.
They are linked by a chain (not shown).

[0030]

As is apparent from the above description, claim 1
In the method for treating shredder dust according to
By adding a carbonating agent to the shredder dust, heavy metals such as lead contained in the shredder dust can be converted into complex salts such as carbonate minerals, whereby elution of harmful substances can be prevented. Then, since cement is added to the shredder dust in addition to the carbonating agent, the shredder dust can be kept in an alkaline atmosphere, thereby preventing elution of heavy metals and the like. In both cases, the shredder dust can be solidified into an appropriate shape, thereby improving the transportability and the handling property and facilitating the disposal. In addition, since it is solidified while preventing elution of heavy metals and the like, it can be used for other uses such as building materials.

In particular, in the method for treating shredder dust according to the third aspect, when the shredder dust contains an irregular material such as a wire rod, it can be fixed or tilted with a stirring blade such as a screw blade inside the kneading vessel. Since the kneading is performed by a simple rotary mixer, it is possible to prevent an irregular-shaped object such as a wire rod from being entangled with the stirring blade when kneading with a pug mill. In addition, since the solid includes an amorphous material such as a wire, the solid becomes a stronger solid and can be used as a good building material.

[Brief description of the drawings]

FIG. 1A is a plan view of a main part of processing equipment used for a method for processing shredder dust according to an embodiment of the present invention. (B) is a principal part side view of the processing equipment used for the processing method of the same shredder dust.

FIG. 2 is an explanatory view of another tiltable rotary mixer used for processing equipment used in the shredder dust processing method.

FIG. 3 is an explanatory diagram showing a process of generating shredder dust used in the shredder dust treatment method.

FIG. 4A is a flowchart of a method for treating the shredder dust. (B) is a flow chart of the method for treating shredder dust before the injection of cement and sodium carbonate. (C) is a flowchart at the time of charging cement and sodium carbonate in the method for treating shredder dust. (D) is a flowchart at the time of kneading shredder dust, cement and sodium carbonate in the method for treating shredder dust.

FIG. 5 (a) is a flowchart at the time of supplying water in the method for treating shredder dust. (B) is a flowchart at the time of supplying water to the auxiliary tank in the method for treating shredder dust. (C) is a flowchart at the time of charging aluminum sulfate in the method for treating shredder dust.

FIG. 6A is a flowchart of the method for treating shredder dust when aluminum sulfate and water are added and kneaded. (B) is a flowchart at the time of kneaded material discharge of the shredder dust treatment method.

[Explanation of symbols]

10: processing equipment, 11: tiltable rotary mixer, 11a:
Kneading container, 11b: support leg, 11c: rotation driving means, 1
1d: power transmission means, 13: raw material storage yard, 14:
Cement supply means, 14a: cement hopper, 14
b: pipe for supplying cement, 15: means for supplying sodium carbonate, 1
5a: sodium carbonate hopper, 15b: sodium carbonate supply tube, 16: sulfate band supply means, 16a: sulfate band storage tank, 16b: sulfate band supply pipe, 17: water supply means, 17a: water storage tank, 17b: upstream Side water supply pipe, 18: kneaded material storage yard, 19: passage, 19a:
Uphill road, 20: Wheel loader, 21: Hydraulic excavator, 22: Base, 22a: Installation floor, 22b: Installation floor, 2
3: Stand, 24: auxiliary tank, 25: hopper, 28:
Waste, 29: Pre-shredder, 30: Shredder, 31: Magnetic separator, 32: Non-ferrous metal separator, 33:
Kneading means, 34: dust collector, 35: tiltable rotary mixer,
36: kneading container, 37: support, 37a: tilt axis, 37
b: gear, 38: rotary drive means (electric motor), 39:
Support leg, 40: tilt drive source (electric motor), 41: reducer, 42: connected body, 43: base, 44: stopper

Continuation of the front page (56) References JP-A-9-155319 (JP, A) JP-A-1-284382 (JP, A) JP-A-58-45783 (JP, A) (58) Fields investigated (Int .Cl. ⁶ , DB name) B09B 3/00

Claims (3)

(57) [Claims] After shredded waste such as used automobiles and home electric appliances with a shredder, it is composed of residual residues obtained by collecting main parts of ferrous and non-ferrous metals and / or dust collected during the treatment process. A method for treating shredder dust, comprising: adding a carbonating agent made of lime, sodium carbonate, sodium bicarbonate and the like to the shredder dust and cement and kneading the mixture in a kneading container; A second step of adding and mixing aluminum sulfate and water to the shredder dust in which the cement is kneaded, and further comprising the carbonating agent, cement, aluminum sulfate,
And shredder dust in an amount of 1 to 4 parts by weight, 3 to 20 parts by weight, 1 to 4 parts by weight, and 10 to 30 parts by weight, respectively, based on 100 parts by weight of the shredder dust. Processing method. 2. In the first step, a hydroxylating agent such as aluminum hydroxide and slaked lime is further added to the shredder dust with respect to 100 parts by weight of the shredder dust.
2. The method for treating shredder dust according to claim 1, wherein the amount of the shredder dust is within a range of from 4 to 4 parts by weight. 3. The kneading container is a tiltable or fixed rotary mixer having stirring blades inside.
Or the method for treating shredder dust according to 2.