JPS5858999A - Producing device for pressed blocks of casting scraps as raw material for casting - Google Patents

Abstract

PURPOSE:To produce compressed blocks having high resistance to impact, heat and pressure by mixing casting scraps which are removed of impurities and are decreased of oils and water contained therein with binders, then compressing the scraps to briquettes and sintering the briquettes in a reducing atmosphere then cooling the sintered briquettes slowly. CONSTITUTION:Casting scraps are sieved and are further separated magnetically to be removed of impurities and heavy metals. These scraps are removed of oils and water contained therein with a centrifugal separator down to <=2%. About 2wt% suitable binders are added to such scraps and both are thoroughly kneaded with a mixer or the like. The mixture is supplied automatically by each specified amt. to the pressing section of a press device, and is firmly compressed in the pressing section, whereby briquettes are formed. The briquettes are placed on a conveyor and are introduced into a heating furnace where the briquettes are heated in a reducing atmosphere to cause endothermic reaction of the added binders, whereby the scraps are sintered. the sintered briquettes are put in a hermetically sealded vessel, and are slowly cooled in a reducing atmosphere whereby the briquettes are hardened while their oxidation is prevented.

Description

[Detailed Description of the Invention] This invention mixes foundry waste such as industrial waste (chips from cutting cast iron, etc.) with a suitable binder to solidify it and sinter it. It is preferred as a casting layer material because it has a V% component content, has few impurities, and has excellent impact strength and heat resistance.

In other words, castings are usually processed by cutting after casting, and the powder produced at this time is often discarded as waste, which is in an inappropriate shape to be reused as a raw material. Also, since it grows in large quantities, if it is reused, it will save a lot of JII resources.

General #C# Iron WpA, etc., the above-mentioned iron powder, etc. @ Foundry waste has a large layer of machine oil, moisture, etc.
If you try to put this type of foundry waste directly into a melting furnace and use it as raw material for castings, the attached oil will burn and generate a large amount of black dust, causing air pollution and other pollution problems. It is blown up by hot air, generating a large amount of dust.
In addition to being a cause of secondary pollution, it has nine drawbacks due to poor melting yields and is extremely difficult to reuse, so it is currently being disposed of.

However, these materials are generated in large quantities, and their reuse is strongly desired as resources are saved. For this reason, many attempts have been made to dispose of such foundry waste, but none have been found to be sufficient. For example, there are round pieces made by kneading foundry waste with pulp waste liquid and pressing to solidify, but they do not have sufficient resistance** and heat resistance, and are particularly low in heat resistance, so they are sold as P-yen with other pig iron and -mlC.
When a person falls, they are crushed and destroyed, and the hot air from below blows up the metal fragments, scattering them and creating dust, and the melting process is poor. , it was unsuitable as a raw material. There is also a product in which foundry scraps are placed in a can with a heat-resistant binder and pressed to form a wA shape. After hardening, the hardened state is lowered to the dissolution zone and dissolved. According to K, the above is 9l! Compared to the L-shaped product, the 1ll) is improved, but its shape is larger and its weight is relatively lighter, and it has the drawback that it is difficult to use with a melting device with a small inner diameter, and it hardens in Taisei's III melting furnace. Previously, there was a drawback that the can was crushed by the weight of other melted materials and the gold 14# pieces inside were blown up, generating dust.9. In addition, since the can used was made of a very thin steel plate, it came into contact with other $W4 materials such as pig iron and boks when being poured into the can, causing damage and causing gold j1m pieces to scatter. Furthermore, the popular melting furnace must have a falling distance from the input port of at least IQ or more, and must have excellent impact resistance.In other words, casting scraps must be used as raw material in the melting furnace together with other pig iron, etc. In order to reuse the casting waste, it must be made into a homogeneous product that has excellent impact resistance, heat resistance, and pressure resistance, and is also compact.

In view of the above-mentioned drawbacks of the conventional technology, this invention is a modification of the conventional technology, and is a cast shoulder mass having sufficient strength, heat resistance, and pressure resistance to be reused and superior as raw material semi-pig iron. The aim is to provide manufacturing equipment and contribute to resource conservation. Therefore, this invention aims to use it as semi-pig iron, a foundry raw material that is most advantageous in terms of gold content and can be used as it is. preferred as vz
51. For example, without losing the carbon content before and after J-, the presence of a small amount of 171JflJ4 oil during cutting process is used to reduce the 2-force during rounding press to form into briguts. It is effective in reducing the thickness of the pieces and reduces the amount of black smoke caused by the combustion of oil during sintering after sintering.In other words, impurities are removed and the oil and moisture contained in the pieces are removed by centrifugation. 2≦Vc An appropriate binder is added to the treated workpiece in a weight ratio of about 2-2, and kneaded for several minutes. IKBmM to make a grit, put this grit in a heating furnace, and heat it to 7000C7'l.
Reduction of OC # Heating for 70 minutes in an atmosphere, adding 9 caking agents to react and sintering, putting the sintered glue in a closed container, cooling slowly in a reduction # surrounding, The oxidation of Grigut is cast and hardened to obtain a foundry ingot as a raw material for castings, and its characteristics are as follows. The main purpose is to process the foundry scraps, and secondly, the metal scraps are kneaded with a suitable binder to form a grit, which is then heated and slowly cooled in a reducing atmosphere. Hereinafter, Mr. S will explain the implementation with reference to the drawings.

Figure 111 shows a press device 11 that compresses and solidifies casting waste.
), and in comparison to the same figure, (the illusion is the lower 7-ray A1
1) Lower field for 9 presses installed in the center of O, (4)
The lower cylinder installed in the lower 7 frame (3) is attached to the upper end of the support rod F (8) provided through the piston rod material (1), and The upper cylinder is movably supported and supported by the upper frame 4KIK.
Close the lO part with the lower press rod C wound, lower the upper press rod αυ of the upper cylinder (lil), and press gold! Compress the foundry waste in 1143.

In addition, press the lower four rods for press (!1 and upper rod Fun)! Both iI#i are formed into substantially arc-shaped concave surfaces so that the compression force is concentrated from the periphery of the object to the center. A hopper in the shape of a nine-inverted truncated cone is integrally attached to the upper part of the metal 4), which guides and feeds the casting scraps into the metal 41, facilitating the feeding operation. a field is lower s7 frame 1
3) is a dispensing cylinder protruding from the upper side,
Nine discharge shades (14
This will make you pay out one more. The bowl @ is a feeder that actively feeds casting scraps into the hopper round, and its tip is formed into a bifurcated shape as shown in Fig. 2. 2II is located at Kl1 Exit. This feeder is suspended and supported so that it can vibrate, and is vibrated by nine vibrators installed at the bottom at predetermined times, actively feeding the foundry waste and sending it to the hopper! Supply equal amounts from two places into the hopper Q clay and gold m (4
) This prevents the debris from accumulating in one direction, so that each part is compressed evenly during compression, and the density is almost uniform. The feeder 91 is supplied from above via a shoe Ql). A dart α which can be opened and closed is provided at the tip of the sheet fist η, and the gate tts is opened at a predetermined time to supply casting scraps to the feeder. The supply source is set by the opening time of the gate IIs and the opening time. α#/fi feeder α fathom above shoot 04
Separately, there is a 9 auxiliary hopper that stores casting scraps and additives other than the foundry scraps supplied from the upper shoe tt'4, and supplies the contents from this auxiliary hopper oh to the feeder 9@ when necessary. Then, on the feeder, it is mixed with the foundry scraps from chute 01 and fed to the hopper and metal f43. W
The IJ diagram and the final diagram are heating F-, which heats compressed 9 casting scrap briquettes in a reducing atmosphere;
For example, a belt made of gold and j4 having a q-wringing property is circulated by a chain (not shown) in a chain (not shown). In order to have a heat insulating effect (it is formed into a multi-layered structure with heat insulating material and has a nine-furnace body, it is installed so as to cover the conveyor device @11t, and from the entrance (14a) side) to the exit (ji41e) @ and @ktlc slope. a Set 41, install the heating burner (toward) at the top of the inlet (84 m), facing the internal force, and turn the burner (2)
The heat of -rMK of the furnace body ■ is reflected downward, and the heat of these areas is reflected downward! ! ! Heat the demon to create a high-temperature atmosphere, and heat the briquettes directly with the flame of the burner.弼 is the secondary combustion chamber installed near the rear of the furnace body.
The furnace body (2) is connected to the exhaust pipe, and part of the exhaust gas generated during sintering of briquettes is sent from the exhaust pipe to the secondary combustion chamber, where it is re-burned in ζζ. It escapes and is released into the atmosphere from the exhaust stack (c). Four is one (2)
In the intake pipe where the air pressure is 1'cl1 near the outlet (b),
It communicates with the heat exchanger installed around the exhaust gas mu], and the exhaust gas remaining near the outlet (8411) of the furnace body is sucked in through the intake pipe@, and heated by the exhaust gas i*121, making it a good heat source. The air is supplied to the exchanger, where it is heated, and the air pipe is sent to the furnace body.
is supplied into the furnace body (c) from the inlet (24a) of the furnace, and a reducing atmosphere is created inside the furnace body (c). - is the air pipe - 〇 The tIc installation in the middle is heated at 97 am and actively sends the gas to the inlet of the f body (to the relay), and the exhaust gas remaining at the outlet (314 m) of the furnace body (toward) The gas is actively inhaled.Grigut is sintered in the furnace body, and the intervening binder undergoes an endothermic reaction, which combines with the oil that adheres to the surface of the casting scraps and forms metal fines. The pieces are firmly joined together and excess oil is removed.In addition, the exhaust gas heated by the heat exchanger 11- is approximately 7.
Since the temperature ranges over 000CK, it is difficult to sinter the grid sufficiently even if the burner heating is stopped halfway. The sintered briquettes are placed in a sealed container II (not shown), and the gas released from the briquettes forms an atmosphere in which the briquettes are slowly cooled.

To explain the effect of kV% on the above llI formation, first, the pressure 11
Sieve the foundry scraps in step 4 and further! Gunnet special treatment (yo)
After removing impurities such as heavy metals, using a centrifuge to reduce the oil and water content to less than 100 ml, add the appropriate amount of thickener and binder in an approximate weight ratio. ｑ匝yo) &
141 minutes of warm sewing, and the casting scraps generated during warming! li
Spread the desiccant with l/II and stir evenly throughout. However, when the foundry waste contains a large amount of moisture, add an antifoaming agent such as silicone resin I1 and knead for several minutes.

The heat during kneading evaporates the binder and it is consumed, so it is necessary to compensate for rounding. 'Re-add approximately S~/- to achieve the optimum crosstalk condition.

As mentioned above, the casting scraps which have been thoroughly kneaded with the binder are supplied to the press machine +11 (shape) (171).Then, the lower cylinder (I) is operated, the piston rond (61) is shortened, Gold 11 (41 and Hopper 1111
After that, the first gate of the chute is opened and casting scraps are fed to the feeder Q@, and the vibrator is operated. The gate end of the aml is closed and the metal chips are fed in equal amounts from two places into the hopper (121 and the mold (4)). The vibrator section is stopped to stop the supply operation.In this state, the upper cylinder (1) is operated to extend and lower the upper rod circle to compress the foundry waste in the mold (4) and make it the same shape. The compression operation of the upper part (rad OK) is completed, and the grip is shaped like t.
If it is L, the piston tube of the lower cylinder (6)
@), raise gold m(4) and hopper ut, raise XK upper rod (lυ), lower rod (
1 Dispense the grout on the top onto the discharge cylinder 9! 4 0 Then lower the mold (41) and hopper α force again, and block the lowering of the mold (4) with the lower rod (2). Then, casting scraps are fed into the mold (41) to continuously form briquettes.

In this way, 7fi: Usamaru Preget is discharged.
) Conveyor production from Q41? It is then transferred to the upper deck and sent to the furnace body where it is sintered. In other words, the glue fed into the furnace body (2) is exposed to a reducing atmosphere at the same temperature as it moves within the furnace body, and is heated from the surface to the inside, causing the coexisting binder to undergo an endothermic reaction. It combines with the oil adhering to the surface of the foundry scraps to firmly bond the foundry scraps together. On the other hand, excess oil is evaporated and removed by heat. A part of the bond gas generated from the grid during sintering is sent through the exhaust pipe to the secondary combustion storm, where it is processed and released into the atmosphere from the exhaust tlj@. The exhaust gas from the large parts remaining near the outlet (24n) of the furnace body is exchanged with the intake pipe] 4 tons of heat! The sintered 9-glykets are then heated and supplied into the air pipe through the furnace body (toward), forming a reducing atmosphere. The exhaust gas released from the pre-get
It is then cured in a reducing atmosphere for more than a few hours, slowly cooled, and hardened to form a compacted molding waste mass.

In the above manner, a #debris pressure mass is formed, but -
When compressing waste to make grit, the specific electric current applied to the pig iron is applied, and in order to obtain sufficient heat resistance strength of 1 lb, surface pressure is applied. , pressurize with a pressure of more than 400 mm, and when supplying a part to the mold (41), the casting scraps are deposited almost flush with the mold (drawing). Then, the pressure acts uniformly on the whole, and the stress acts in the direction of the central force, so a dense VM grid is formed. The inside of the furnace body was heated to 300°C to ooOc in order to cause a sufficient endothermic reaction to combine with the adhering oil and join the casting scraps, as well as to remove excess oil that does not combine with the binder.
Then, heat for 10 minutes at this high temperature,
It is sintered. Normally, it is desirable to heat for about 20 minutes at around 7,000 degrees. Since the pre-glugs after sintering are also cured in a reducing atmosphere and slowly cooled, there is no fear of oxidation and a sufficiently hardened casting waste compact can be obtained. Therefore, even if it is put into a melting furnace together with other raw materials and used, it will not break down to the melting point and will not generate powder.

In addition, when compressing the castings, the foundry scraps to be mixed are stored in the auxiliary hopper, and when the casting scraps are fed from the hopper i1 to the hopper i1, the scraps are simultaneously removed from the auxiliary hopper. The gold is supplied to the feeder rJ@ and into the gold 111f41 to be compressed.

Fig. 117 is a drawing showing another structure of the two bodies, in which the heating burner is not inserted into the body, the structure is sealed, and a heating plate is provided on the top of the heating part, and this heating #L- is used. The inside of the furnace body (2) is heated to a high temperature (by applying energy from the outside with a burner and dissipating heat from a heating plate). If this type of furnace is used, there is no need to supply combustion air into the furnace body, so the inside of the furnace body can be made into a completely reducing atmosphere.

As explained above, this invention removes impurities and centrifuged m
A suitable binder is added in a weight ratio of about 2≦to the material to be treated, which has been treated with a machine to reduce the oil content and water content to less than 2%, and is stirred homogeneously. After P, it is strongly compressed in a press machine to form a silicate, and this silicate is put into a heating furnace and heated for 70 minutes to Jθ in a reducing atmosphere of SθQO (near 1. to 2000G). , *m is endothermically warped, the sintered grigs are placed in a sealed container, and slowly cooled in a reducing atmosphere to prevent the oxidation of the grigs and harden them. Instant casting scrap can be made into a casting scrap compact that has the same impact resistance and heat resistance as pig iron, and is compatible with other foundry raw materials.
[It can be reused as a material, resulting in significant resource savings. This invention also includes a coating that has been treated to remove impurities, reduce the oil and moisture content to less than or equal to 0, and is homogeneously kneaded with a suitable binder. Jt--a press unit that firmly compresses the preget into a grit, and an automatic supply device that automatically supplies a fixed amount of KPfr to the press unit, and the preget is heated in a reducing atmosphere and sintered. It consists of a heating furnace in which the sintered pre-glugs are slowly cooled in a reducing atmosphere, and a closed container in which the sintered pre-glugs are slowly cooled in a reducing atmosphere.The casting scraps can be turned into compacts automatically through a series of assembly operations, resulting in stable and high-quality products. It will be done.

Because a reducing atmosphere is created in the furnace body, the briquettes do not oxidize even when heated to high temperatures during sintering, improving the product's durability. Note that this method does not work) The preget made has a fine organization.
! A protective II film is formed on the surface of the sintered ridge, rather than a lK paste, and it withstands long-term storage (there is less oxidation due to storage), which also has a great effect on improving the yield.

[Brief explanation of drawings]

Fig. 1 is a side view showing the overall structure of the press device according to the present invention, fsJ is a plan view showing the tip of the tweeder, *' is a plan view of the heating furnace according to the present invention, and Fig. V is the top view of the heating furnace according to the present invention. Vertical section 11
The top view and FIG. 5 are folded views showing another aspect of the heating furnace.

Claims (1)

[Claims] 11) The processed material, which has had impurities removed, has been treated to contain oil and moisture of -% or less, and is homogeneously mixed with an appropriate binder, is firmly compressed and formed into a glue by a press section, and then transferred to the press section. A press device that is similar to a self-help supply device that supplies a predetermined amount of the material to be processed, a heating device that heats and sinters the above-mentioned grit in a reduction chamber, and a press that heats and sinters the grit after sintering. 1. An apparatus for producing compacted foundry waste as a raw material for casting, characterized in that a closed container is slowly cooled in a reducing atmosphere of 9 L^.