Method and device for preventing adhesion of kneaded raw materials in a vertical vacuum chamber of a vacuum extrusion molding device

Abstract

To provide an easy and low-cost method of suppressing adhesion of a kneading material capable of suppressing adhesion of a kneading material to a vacuum chamber wall in a vacuum extrusion molding apparatus of a reactive coke agglomerate and the like for a blast furnace, and an apparatus thereof.SOLUTION: One or a plurality of rubber or resin-made long-sized plates is (are) fixed onto an upper part of a vertical vacuum chamber only by an upper end of the long sized plate, and the long-sized plate(s) is (are) suspended with a clearance from the vertical vacuum chamber inner wall in a vertical vacuum chamber of a vacuum extrusion molding apparatus for a non-fired agglomerated ore to prevent the kneading material from adhering to the vertical vacuum inner wall.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a technique relating to a method for suppressing adhesion to a vacuum chamber of a vacuum extrusion molding apparatus for carbon-containing agglomerates used in a blast furnace, and to the apparatus. [Background technology]

[0002] In a blast furnace, raw ore and lump coke are charged from the top of the furnace while air is blown from the bottom of the furnace. The reducing gas generated from the lump coke and the blown air is blown from the bottom to the top of the furnace, reducing and dissolving the iron oxide in the raw ore. In order to ensure the ventilation of the reducing gas in the furnace, the raw ore is required to have a strength that does not powder in the furnace. For this reason, raw materials that have been fired at high temperatures in advance, such as sintered ore and fired pellets, are usually used in blast furnaces.

[0003] In response to this, non-calcined agglomerates have been developed that use hydraulic binders such as cement to reduce the energy consumption required for calcination and reduce the amount of carbon dioxide, a greenhouse gas, generated. As the raw material for non-calcined agglomerates, it may be possible to use inferior fine ores that have been considered to have low sinterability and are difficult to mold into agglomerates.

[0004] Furthermore, as described in Patent Document 1, coke fines, which has a small particle size and is difficult to directly charge into a blast furnace, and anthracite, which is inexpensive but has low caking properties and is difficult to convert into coke, can be mixed as reducing agents into non-calcined agglomerates, and it is expected that the reducing agent ratio of the blast furnace can be reduced.The latest findings reveal that the effect of reducing the reducing agent ratio in a blast furnace can be maximized by setting the carbon content (TC) incorporated in the non-calcined agglomerates to 120 to 200 mass% (equivalent to 15 to 25 mass% in TC) of the theoretical carbon amount required to reduce iron oxide to metallic iron.

[0005] The hydrates in the non-sintered agglomerates formed by the hardening reaction of the hydraulic binder are decomposed by an endothermic reaction when heated to about 400°C or higher in a blast furnace. This causes the strength of the non-sintered agglomerates to decrease significantly in the furnace, and there is a concern that they may be pulverized. If the non-sintered agglomerates are pulverized in the blast furnace, it will deteriorate the permeability inside the furnace, so a certain level of hot strength is required for non-sintered agglomerates for blast furnaces. On the other hand, if a large amount of hydraulic binder is used to ensure hot strength, the amount of reducing material input to the blast furnace will increase to compensate for the heat lost by the endothermic reaction, and the cost of molten iron will increase.

[0006] In view of the above, there is a demand for a method for producing unsintered carbon-containing agglomerated ore that can achieve the hot strength required for use in a blast furnace with as little hydraulic binder as possible.

[0007] Recently, a manufacturing method that can achieve the hot strength required for blast furnace use has been developed, which uses a vacuum extrusion method to manufacture unbaked carbon-containing agglomerates for blast furnace use.

[0008] As shown in the example of Figure 1, the vacuum extrusion molding machine consists of a first extrusion section (mixing section) and a second extrusion section (extrusion molding section). In addition, the area from the outlet of the first extrusion section (mixing section) to the second extrusion section (extrusion molding section) is vacuum degassed to below -40 kPaG to ensure the necessary strength of the molded body, and in order to stably continue vacuum extrusion molding, it is necessary to maintain the filling rate of the kneaded raw material inside the kneading section and the extrusion molding section within an appropriate range. The appropriate value for the filling rate of the kneaded raw material in the kneading section is 50% by volume or more and 90% by volume or less, and optimally 50% by volume or more and 65% by volume or less. The appropriate value for the filling rate of the kneaded raw material in the extrusion molding section is 50% by volume or more and 95% by volume or less, and optimally 50% by volume or more and 60% by volume or less.

[0009] Here, the filling rate of the raw material in the extrusion molding section 7 is generally monitored by an operator through a sight glass 10 installed at the top of the vacuum chamber 6. However, since a large amount of wet powder raw material 20 passes through the vacuum chamber 6, the raw material 20 adheres to the wall surface and grows. When the adhesion of the raw material 20 grows beyond a certain level, it blocks the view from the sight glass 10, making it impossible to observe the extrusion molding section 7. In this case, it becomes necessary to stop the operation and clean the inside of the vacuum chamber 6 (after several hours to several tens of hours), and the operating rate of the equipment decreases.

[0010] This is because, if regular monitoring becomes impossible, there is a concern that the equipment will continue to operate without noticing that the raw material filling rate has exceeded 95%, causing overloading and breakdown, resulting in a long-term equipment shutdown (several tens of hours to several days). Furthermore, if the raw material 20 adheres to the wall surface of the vacuum chamber 6 and the vacuum chamber 6 is blocked, the raw material supplied from the kneading weir 4d will not reach the extrusion molding section 7, and operation will become impossible. In this case, the equipment must also be stopped for internal cleaning. Therefore, in order to continue kneading and molding stably, it is necessary to suppress the adhesion of the raw material 20 to the wall surface of the vacuum chamber 6. Generally, the vacuum extrusion molding device to which the present invention is directed is cleaned inside periodically (every tens of hours to several days), so it is sufficient to suppress the adhesion to an acceptable range (a level at which the inside can be observed) during this cleaning cycle.

[0011] Next, the difficulty of taking measures to prevent adhesion to the wall surface of the vacuum chamber 6 will be described. The vacuum chamber 6 is required to be highly airtight in order to maintain the vacuum degassing conditions (≦-40 kPaG) necessary to ensure product quality. Therefore, even if a rubber plate 11 or the like is attached to cover the wall surface of the vacuum chamber 6, it is difficult to pulsate the rubber plate 11 from the outside with a mechanical force or with pressure caused by feeding a fluid (air, etc.). In addition, it is desirable to avoid opening and cleaning the vacuum chamber 6 periodically at relatively short intervals (for example, every few hours) because this leads to a decrease in the operating rate.

[0012] Therefore, in order to prevent adhesion to the wall surface of the vacuum chamber 6, a method is required that can be implemented without applying mechanical or compressed air forces from outside the vacuum chamber 6. Furthermore, the raw material 20 to be kneaded that is the subject of the present invention is wet (water content is several percent to several tens percent) and contains a large amount of fine powder (for example, powder of ≦100 μm), and therefore easily adheres to the wall surface of the device.

[0013] Conventionally, the walls of the vacuum chamber 6 are cleaned by operators by stopping the equipment periodically (every 10 hours to several days) or whenever adhesion growth is confirmed (at the earliest several hours after the regular cleaning). If cleaning becomes necessary in a short period of time (for example, several hours) for some reason (high moisture content of raw materials, high fine powder content, etc.), this leads to a large increase in the workload and a decrease in the equipment operating rate.

[0014] For this reason, various adhesion prevention measures have been considered. For example, as disclosed in Patent Documents 2 to 7, there are methods in which liners or sheets installed in chutes or conveyor transfer sections are vibrated or rocked in some way.

[0015] As a specific method for moving the sheet or liner, for example, as disclosed in Patent Documents 2 and 3, there is a method in which a sheet or liner with only a portion fixed is mechanically impacted from the outside.

[0016] However, since the sheet is mechanically pressed from the outside, airtightness cannot be maintained in the vacuum chamber 6, making application of this method difficult. In addition, it is not realistic to newly install a vibration generating device or mechanically operated equipment because of the difficulty in terms of equipment space and the high concern that the operating equipment may soon become unable to operate due to dust adhesion.

[0017] In addition, as described in Patent Documents 5 to 7, there is a method in which a fluid is introduced between the inner wall of the device and the sheet or liner to move the sheet or liner and remove the adhering matter.

[0018] However, since the inside of the vacuum chamber is under strong negative pressure (approximately -100 kPa to 40 kPa) to maintain the vacuum degassing conditions, if fluid leaks into the vacuum chamber, it is undesirable because the large pressure fluctuations could damage the equipment (not only the vacuum chamber and extrusion molding device, but also peripheral equipment such as the vacuum pump).

[0019] Furthermore, in Patent Document 4, a sheet material with only its upper end fixed at a conveyor transfer section is supported from the rear so that the sheet material bends due to the impact of the conveyor-transported raw material colliding with it from the front, making it less likely for the colliding raw material to adhere to it.

[0020] However, in the vacuum chamber 6 where the raw material falls almost vertically, the impact force of the raw material alone is not enough to bend the sheet material sufficiently, and the adhesion suppression effect of this method is not sufficient.

[0021] A specific example of the kneading and molding of non-sintered agglomerates according to the present invention will be described. In the kneading and molding of powder, raw materials required for manufacturing non-sintered agglomerates and an appropriate amount of moisture, if necessary, are charged into a kneading section, and the powder raw materials are kneaded by kneading blades and screws in the device.

[0022] The raw material is then extruded in the extrusion molding section in the subsequent process. There are various types of kneading and molding devices, but when the raw material is continuously kneaded and molded in large quantities (for example, several tons / hr or more), a non-calcined agglomerate kneading and molding machine is generally used, which is composed of a kneading section 4 that uses kneading blades 4c (sometimes a screw) attached to a horizontally installed single-shaft or multi-shaft kneading shaft 4b to knead the raw material 20 while continuously conveying it in the horizontal direction, and an extrusion molding section 7 that extrudes the raw material 20 from an extrusion molding gate 7d with an extrusion molding blade 7c (sometimes a screw) to mold it, as shown in the example in FIG. 1. In the example shown in FIG. 1, the extrusion molding section 7 conveys the raw material by the extrusion molding blade 7c inside the casing 7a, and this extrusion molding blade 7c is provided on a rotatable extrusion molding section shaft 7b. [Prior art documents] [Patent documents]

[0023] [Patent Document 1] Patent No. 5000402 [Patent Document 2] Japanese Patent Application Publication No. 10-311682 [Patent Document 3] Patent No. 5287153 [Patent Document 4] Japanese Patent Application Publication No. 10-279061 [Patent Document 5] Japanese Utility Model Application Publication No. 1-169520 [Patent Document 6] Japanese Utility Model Application Publication No. 5-68944 [Patent Document 7] Registered Utility Model No. 3214008 Summary of the Invention [Problem to be solved by the invention]

[0024] The present invention provides an easy and low-cost method and device for preventing adhesion of mixed raw materials to the wall surface of a vacuum chamber in a vacuum extrusion molding device for carbon-containing agglomerates for blast furnaces, etc. [Means for solving the problem]

[0025] A method for suppressing adhesion of a kneaded raw material in a vertical vacuum chamber of a vacuum extrusion molding apparatus for solving the above problems includes the following steps: (1) In a vertical vacuum chamber of a vacuum extrusion molding apparatus for non-sintered agglomerates, one or more long rubber or resin plates are fixed at only their upper ends to the top of the vertical vacuum chamber, and the long plates are hung down with a gap between them and the vertical vacuum chamber wall, thereby preventing the raw materials from adhering to the vertical vacuum chamber wall.

[0026] Also, (2) In (1), a rotating blade that comes into rotating contact with the long plate is installed in the vertical vacuum chamber of the kneading shaft installed in the vacuum extrusion molding device, thereby striking the long plate and causing the mixed raw material adhering to the long plate to fall.

[0027] Also, (3) In (1) or (2), the lower end of the long plate is lower than the lower end of the kneading gate of the vacuum extrusion molding device and higher than the center of the extrusion molding shaft.

[0028] Furthermore, as a device for suppressing adhesion of the kneaded raw material in the vertical vacuum chamber of the vacuum extrusion molding device, (4) In a vertical vacuum chamber of a vacuum extrusion molding apparatus for non-calcined agglomerates, one or more long plates made of rubber or resin are fixed to the upper part of the vertical vacuum chamber at only their upper ends, and the long plates are suspended from the inner wall of the vertical vacuum chamber with a gap therebetween.

[0029] moreover, (5) In (4), a rotating blade that comes into rotating contact with the long plate is installed in the vertical vacuum chamber of a kneading shaft installed in the vacuum extrusion molding device.

[0030] moreover, (6) In (4) or (5), the lower end of the long plate is located below the lower end of the kneading gate of the vacuum extrusion molding device and above the center of the extrusion molding shaft. Effect of the Invention

[0031] According to the present invention, a method and apparatus for suppressing adhesion to the vacuum chamber of a vacuum extrusion molding device are provided, which can significantly suppress adhesion of the raw material to the wall surface of the vacuum chamber, and can significantly increase the number of operating days, for example, by enabling stable continuous operation for more than 10 hours, and thus has great technical significance. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a schematic diagram of a vacuum extrusion molding machine. [Diagram 2] FIG. 13 is a diagram showing an outline of the adhesion state of the raw material to be kneaded in the vacuum chamber. [Diagram 3] FIG. 13 is a diagram showing the installation of rubber plates and the like in a vacuum chamber. [Figure 4]FIG. 13 is a diagram showing an example of a rotating blade that strikes a rubber plate or the like. [Diagram 5] 1A to 1C are diagrams showing the state of installation of rubber plates etc. before operation, the state of the vacuum chamber during operation, and the moment when the rotating blades come into contact with the rubber plates etc. and give an impact. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The following describes a mode for carrying out the invention.

[0034] In the present invention, a method is provided for suppressing adhesion of raw materials to the wall surface of the vacuum chamber 6 by using one or more long plates of rubber plates, etc. 11 (natural rubber plates, synthetic rubber plates, thin resin plates, other flexible sheets, liners, etc.) fixed at only their upper ends to the inner wall of the vacuum chamber 6, and more preferably by using rotating blades 12 which are installed in the vacuum chamber 6 portion of the kneading shaft 4b and have the function of scraping off raw materials adhering to the rubber plates, etc. 11 while pulsating the entire rubber plate, etc. 11, thereby peeling off the adhering raw materials from the entire rubber plate, etc. 11.

[0035] An example of the structure near the kneading section 4 of this technology is as shown in FIG. 1, where the raw material 20 sent from the mixer 1 is fed into the raw material inlet 2. The raw material 20 fed into the raw material inlet 2 is led to the kneading section 4 through the connecting pipe 3, and is kneaded using the kneading blades 4c provided on the shaft 4b. A raw material compacting section 4e is provided in front of the weir 4d from which the raw material is pushed out. In addition, an internal observation section 4f such as a grating is provided at the top of the kneading section 4, and water can be sprayed from the water-adding nozzle 5 through this section onto the raw material 20 in the casing 4a. A vacuum chamber 6 leading to the extrusion molding section 7 is provided beyond the kneading section 4, and a vacuum pump 8 is connected to this vacuum chamber 6 via a vacuum pump connection pipe 9. A viewing window 10 is provided at the top of this vacuum chamber 6. Below, a rubber plate or the like 11 and a rotary blade 12 provided in the vacuum chamber 6 will be described.

[0036] 1) Rubber Sheets, etc. 11 2 shows an outline of the adhesion state of the raw material to be kneaded inside the vacuum chamber 6. Inside the vacuum chamber 6, the adhering raw material to be kneaded 20 adheres most noticeably to the left and right wall surfaces (left and right wall surfaces) of the kneading weir 4d. This is because the raw material to be kneaded 20 discharged from the kneading weir 4d falls so as to spread out to the left and right. In particular, the left and right wall surfaces at the position corresponding to the range from the center to the lower end of the kneading weir 4d are prone to adhesion due to scattering of finely powdered raw material and water vapor discharged from the kneading weir 4d, and the adhesion and growth of the raw material to be kneaded 20 is most noticeable among all the wall surfaces.

[0037] On the other hand, the wall surface (entrance side wall surface) of the vacuum chamber 6 on the side of the kneading weir 4d, through which a large amount of raw material 20 always passes, and the outlet side wall surface (the surface facing the inlet side wall surface) which is relatively far from the kneading weir 4d, have relatively little raw material adhering to them. Therefore, measures against adhesion to the wall surfaces of the vacuum chamber 6 are most necessary on the left and right wall surfaces, and it is desirable to install rubber plates or the like 11 in at least two places on the left and right wall surfaces.

[0038] In addition, a rubber plate or the like 11 may be installed on the inlet side wall surface or the outlet side wall surface. In this case, the shape of the rubber plate or the like 11 may be processed so as to avoid the kneading weir 4d and the kneading shaft 4b.

[0039] 2) Adhering raw materials Fig. 3 shows a method of installing the rubber plate 11. One or more rubber plates 11 may be used, and a single rubber plate 11 may have multiple cuts or slits to hang down. This rubber plate 11 is fixed only at its upper end to the inner wall of the vacuum chamber 6, and the other part is free (not fixed to the inner wall of the vacuum chamber 6). The upper end does not have to be completely the upper end, and may be an upper end that is lower than the upper end by several mm to several tens of mm depending on the situation.

[0040] Details of the rubber plate 11 will be described later, but simply installing the rubber plate 11 produces a certain effect, as the falling raw material 20 collides with the rubber plate 11 and the raw material 21 adhering to the rubber plate 11 falls off due to the impact. Furthermore, an even greater effect can be obtained if the rubber plate 11 is pulsated by contact with the rotating blades 12, which will be described later, causing the raw material 21 adhering to the rubber plate 11 to fall off.

[0041] The present invention will be described in detail below. In order for the rubber plate or the like 11 to pulsate, it is necessary to provide a gap (for example, a gap of several mm to several tens of mm, preferably a gap of about 5 to 50 mm from the inner wall of the vacuum chamber 6, taking into consideration the capacity of the vacuum chamber 6) between the rubber plate or the like 11 and the inner wall of the vacuum chamber 6.

[0042] Next, the upper and lower limits of the fixing position (upper end) and the lower end of the rubber plate etc. 11 will be described. The lower limit of the fixing position (upper end) of the upper end of the rubber plate etc. 11 is a position higher than the center of the kneading shaft 4b. This is to cover the position where the raw material adhesion is most severe (from the center to the lower end of the kneading weir 4d).

[0043] Due to the structure of the equipment, the upper limit of the fixing position (upper end) of the rubber plate or the like 11 is the upper end of the vacuum chamber 6. The fixing position (upper end) of the upper end of the rubber plate or the like 11 may be determined arbitrarily as long as it is within this range (from the center of the kneading shaft 4b to the upper end of the vacuum chamber 6), but considering the reduction in the risk of the rotating blades 12 coming into contact with the fixing of the rubber plate or the like 11 and damaging the device, and the suppression of adhesion of the raw material 20 to the wall surface, it is more preferable that the fixing position (upper end) be in the range from the upper end of the vacuum chamber 6 to the upper end of the kneading weir 4d.

[0044] Next, the position of the lower end of the rubber plate or the like 11 will be described. The lower end of the rubber plate or the like 11 must be at least lower than the lower end of the kneading weir 4d. This is because, as described above, the raw material 20 is most likely to adhere to the wall surface corresponding to the center to the lower end of the kneading weir 4d.

[0045] On the other hand, it is desirable that the lower end of the rubber plate 11 is located above the center of the extrusion shaft 7b. This is to prevent the rubber plate 11 from being caught in the rotation of the extrusion blade 7c or the extrusion shaft 7b and being damaged. The position of the lower end of the rubber plate 11 may be arbitrarily determined within this range (the lower end of the kneading weir 4d to the center of the extrusion shaft 7b).

[0046] Here, the material of the rubber plate 11 is not particularly limited as long as it is a natural rubber, synthetic rubber, thin resin, or other flexible sheet or liner. It is more preferable that the rubber plate 11 is an integral body without seams or other irregularities. This is because if the rubber plate 11 has irregularities, these will easily become the starting points of the kneaded and attached raw material 21.

[0047] The rubber plate 11 of the present invention is also easy to maintain. The rubber plate 11 can be easily removed from the device by opening the top of the vacuum chamber 6, and can be cleaned. This is because the rubber plate 11 is fixed only at the top end, and can be lifted up from the top of the vacuum chamber 6 by removing only the top fixing part. Usually, the bottom of the vacuum chamber 6 is covered with a strong liner, and it is difficult to install a large inspection window, so if the rubber plate 11 is fixed at the bottom of the vacuum chamber 6, it takes a lot of time and effort to remove it. On the other hand, the top of the vacuum chamber 6 is generally designed to be openable for inspection and cleaning.

[0048] 3) Rotating blade 12 The rotating blade 12, which is one of the preferred embodiments of the present invention, and its use will be described below. The shape of the rotating blade 12 is arbitrary, and it is sufficient if it has a structure that can give impact to the rubber plate 11 etc. periodically.

[0049] Here, it is more preferable that the tip portion of the rotating blade 12 that comes into contact with the rubber plate or the like 11 is wider. This is because when the tip of the rotating blade 12 comes into contact with the rubber plate or the like 11, not only does it pulsate the rubber plate or the like 11 to cause the adhering raw material 21 to fall off, but it is also expected to have the effect of scraping off the adhering raw material 21 on the rubber plate or the like 11.

[0050] On the other hand, it is preferable that the area of ​​the rotating vanes 12 other than the part that contacts the rubber plate or the like 11 is as small as possible within the range that maintains the necessary structural strength. This is to improve the visibility when the operator observes through the observation window 10. The number of rotating vanes 12 is at least one or more. On the other hand, if the number of rotating vanes 12 is large, the rotating vanes 12 tend to interfere with the field of view of the operator when he or she monitors the inside of the vacuum chamber 6 or the extrusion molding section 7 through the observation window 10, making the monitoring work difficult. Furthermore, there is a concern that the rotating vanes 12 themselves may become the starting point for the adhesion of the raw material to be kneaded to the kneading shaft 4b. Therefore, it is preferable that the number of rotating vanes 12 is small. As a result of the investigation, it is most preferable that the number of rotating vanes 12 is about 1 to 4.

[0051] Here, the size of the rotating blades 12 needs to be within a size that allows them to rotate within the vacuum chamber 6, and should be at least large enough to impact the rubber plate 11 or the like (at least large enough to come into contact with the rubber plate 11 or the like).

[0052] FIG. 4 shows four examples of the rotating blade 12. However, the rotating blade 12 is not limited to these four examples. In FIG. 4, 1) one flat rotating blade 12 is installed. In FIG. 4, 2) and 3) two cylindrical or rectangular rotating blades 12 are installed, and in FIG. 4, 4) is a rotating blade 12 with a special shape in which only the part that comes into contact with the rubber plate or the like 11 is widened, and when the rotating blade 12 comes into contact with the rubber plate or the like 11, the adhering raw material 21 is scraped off, while the visibility of the worker during visual monitoring is improved.

[0053] When rubber plates or the like 11 are installed on the inlet and outlet wall surfaces of the vacuum chamber 6, it is difficult for the rotating blades 12 to impact the rubber plates or the like 11. However, since the adhesion of the raw material 20 to the inlet and outlet wall surfaces is less than that to the left and right surfaces, the adhesion of the raw material 20 to the inlet and outlet wall surfaces can be sufficiently suppressed by the pulsation generated by the raw material 20 colliding with the rubber plates or the like 11.

[0054] In the present invention, by using the rotating blades 12 installed on the kneading shaft 4b, it is possible to apply force to the rubber plate 11, even without a mechanism that applies an impact to the rubber plate 11 from outside the vacuum chamber 6. Therefore, it is possible to pulsate the rubber plate 11 while maintaining the airtightness of the vacuum chamber 6. In addition, the rotating blades 12 themselves can be made small, so that they can be sufficiently introduced into the limited space of the vacuum chamber 6, and the costs of installation and maintenance are also low.

[0055] The above-mentioned adhesion prevention method using the rubber plate 11 and the rotating blades 12 can be easily and inexpensively implemented, thereby preventing the adhesion of the raw material to the wall surface of the vacuum chamber 6, and allowing the vacuum extrusion molding to be continued stably. EXAMPLES

[0056] An embodiment is shown in Figure 5. Figure 5 1) shows the state in which the rubber plate 11 is installed before operation. Figure 5 2) and 3) show the state of the vacuum chamber 6 during operation, and 3) shows the moment when the rotating blade 12 comes into contact with the rubber plate 11 and gives an impact. Note that Figure 5 shows the form in which one rotating blade 12 is installed as shown in Figure 4 1) above, and the blade is rotating at 20 to 30 revolutions per minute. [Explanation of symbols]

[0057] 1 Mixer 2 Inlet 3 Connecting Pipe 4. Mixing section 4a Casing 4b Kneading shaft 4c Mixing blade 4d Mixing Weir 4e. Raw material consolidation section (where the raw material is consolidated before the weir and where mixing is particularly prominent) 4f Internal observation area on top of the mixer (grating, glass window, opening, etc.) 5 Water nozzle 6 Vacuum chamber 7 Extrusion Molding Section 7a Casing 7b Extrusion shaft 7c Extrusion molded blade 7d Extrusion weir 8. Vacuum Pump 9 Vacuum pump connection pipe 10. Peephole 11 Rubber sheets, etc. 12 Rotor blade 20 Mixing materials

Claims

1. In a vertical vacuum chamber of a vacuum extrusion molding apparatus for non-calcined agglomerates, one or more long rubber or resin plates are fixed at only the upper ends of the long plates to an upper portion of the vertical vacuum chamber, and the long plates are hung down with a gap between them and a wall of the vertical vacuum chamber to prevent the raw material to be kneaded from adhering to the wall of the vertical vacuum chamber; A rotating blade that is in rotational contact with the long plate is installed in a vertical vacuum chamber of a kneading shaft installed in a vacuum extrusion molding device, This method for suppressing adhesion of kneaded raw material in a vertical vacuum chamber of a vacuum extrusion molding device is characterized in that the long plate is struck and the kneaded raw material adhering to the long plate falls.

2. 2. A method for suppressing adhesion of raw material to be mixed in a vertical vacuum chamber of a vacuum extrusion molding apparatus according to claim 1, wherein the lower end of the long plate is lower than the lower end of a mixing gate of the vacuum extrusion molding apparatus and higher than the center of the extrusion molding shaft.

3. In a vertical vacuum chamber of the vacuum extrusion molding apparatus for non-calcined agglomerates, one or more long rubber or resin plates are fixed at only their upper ends to an upper portion of the vertical vacuum chamber, and the long plates are hung down with a gap between them and an inner wall of the vertical vacuum chamber; A device for suppressing adhesion of kneaded raw materials in a vertical vacuum chamber of a vacuum extrusion molding device, characterized in that a rotating blade that rotates and comes into contact with the long plate is installed in the vertical vacuum chamber portion of a kneading shaft installed in the vacuum extrusion molding device.

4. 4. A device for suppressing adhesion of kneaded raw material in a vertical vacuum chamber of a vacuum extrusion molding device according to claim 3, wherein the lower end of the long plate is located below the lower end of the kneading weir of the vacuum extrusion molding device and above the center of the extrusion molding shaft.

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