WO2006019047A1 - 再生鋳物砂を製造する方法及び装置 - Google Patents
再生鋳物砂を製造する方法及び装置 Download PDFInfo
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- WO2006019047A1 WO2006019047A1 PCT/JP2005/014821 JP2005014821W WO2006019047A1 WO 2006019047 A1 WO2006019047 A1 WO 2006019047A1 JP 2005014821 W JP2005014821 W JP 2005014821W WO 2006019047 A1 WO2006019047 A1 WO 2006019047A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sand
- roasting
- roasting chamber
- dredged
- furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/10—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by dust separating
Definitions
- the present invention relates to a method and an apparatus for producing reclaimed sediment sand.
- iron or aluminum frame parts are manufactured by sand mold forging using a sand mold formed from sand.
- the dredged sand used for the dredging is reused in the sand dredging by collecting and reclaiming it.
- An organic binder such as cabbage having caking properties may be added to the glazed sand.
- the shape of the mold formed from the sand is suitably maintained.
- Patent Document 1 Japanese Patent Laid-Open No. 63-180340
- the inorganic component (bentonite) mixed in the slag sand is not removed by roasting, and the reclaimed slag sand in which the inorganic component remains is recovered.
- Inorganic components remaining in the reclaimed sediment sand reduce the strength of the sand mold formed from the regenerated sediment sand. It is a cause. For this reason, it was indispensable to perform a separate process for polishing the grains of the glazed sand after the roasting of the glazed sand, resulting in low regeneration efficiency.
- An object of the present invention is to provide a method and apparatus for producing an efficient and high-quality reclaimed sediment sand.
- One aspect of the present invention provides a method for producing reclaimed dredged sand comprising the steps of preparing dredged sand and regenerating the dredged sand.
- the regenerating step is a step of bringing the dredged sand into the furnace, and blowing up the dredged sand to the upper part of the furnace with an air flow of 0.8 mZs or more while roasting the dredged sand. Process.
- the furnace is a circulating flow furnace.
- Another aspect of the present invention provides a method for producing reclaimed dredged sand comprising the steps of preparing dredged sand and regenerating the dredged sand.
- the regenerating step includes a step of bringing the clay sand into a furnace having a roasting chamber, and a roasting temperature of 0.8 mZs or more in the roasting chamber while roasting the sand sand at 600 ° C or higher. Supplying an air flow to blow most of the clay sand up to the upper part of the roasting chamber, and transferring the blown sand sand together with the air flow to the roasting chamber force separation device Process.
- the regenerating step further includes a step of separating the blown-up soot sand from a combustion gas force generated in the roasting chamber, and the separated soot sand from the separation device.
- a step of transferring to the roasting chamber and further comprising a step of repeating the step of blowing, the step of transferring to the separation device, the step of separating, and the step of transferring to the roasting chamber.
- the wind speed of the airflow is preferably 1.5 mZs or more.
- the dredged sand is a used dredged sand used for forging, a dredged sand having a quality other than the standard, an unnecessary dredged sand, or a sand mold that has failed in shaping. Used sand.
- a roasting apparatus having a roasting chamber for roasting dredged sand and the dredged air with an air flow of 0.8 mZs or more during roasting of the dredged sand.
- An apparatus for producing reclaimed sediment sand comprising a blower that blows most of the material sand upward in the roasting chamber.
- a part of the blown up sand is transferred to the roasting chamber.
- a circulation path is further provided for returning from the upper part to the lower part of the roasting chamber through the outside of the roasting chamber.
- the circulation path includes a communication pipe connected to an upper part of the roasting chamber, a separation device connected to the communication pipe and separating the blown-up blown-up sand sand from the combustion gas force generated in the roasting chamber; And a delivery pipe for connecting the separating device and a lower portion of the roasting chamber and returning the sand sand separated by the separating device to the roasting chamber.
- the roasting chamber has a lower part and an upper part wider than the lower part.
- FIG. 1 is a schematic view of an apparatus for producing reclaimed sediment sand according to a first embodiment of the present invention.
- FIG. 2 is a schematic view of an apparatus for producing reclaimed sediment sand according to a second embodiment of the present invention.
- FIG. 3 is a graph showing the relationship between the particle size index of reclaimed sediment sand produced using the reclaimed sediment sand production apparatus of FIGS. 1 and 2 and the wind velocity of the air flow during roasting.
- FIG. 4 A graph showing the relationship between the loss and bending strength of the reclaimed dredged sand produced using the reclaimed dredged sand production apparatus of Figs. 1 and 2 and the wind speed of the air flow during roasting. .
- FIG. 5 A graph showing the change in the particle size index and one wind speed curve of reclaimed sediment sand according to the amount of sand.
- FIG. 6 A graph showing the change in the one-speed curve for the loss of ignition of reclaimed sediment sand according to the amount of sand.
- FIG. 7 A graph showing the change in the bending strength-one-wind speed curve of reclaimed sediment sand according to the amount of sand.
- Dredged sand is sand used for forged molds (sand molds).
- the dredged sand (used dredged sand) that constitutes the sand mold used in the forging is collected and recycled.
- Used dredged sand contains almost no water and contains 0.1 to 10% by mass of organic components.
- the binder contained in the glazed sand is a phenolic organic binder, an inorganic binder such as water glass or bentonite, and a general binder such as clay, and is not particularly limited.
- the method for producing glazed sand according to the first embodiment is suitable for reclaiming glazed sand containing an organic binder.
- the method for producing reclaimed sand of the first embodiment is formed by a thermosetting molding method such as a shell mold method or a self-hardening molding method such as a cold box method in which the sand is self-cured at room temperature. It is suitable for reclaiming the sand used in the sand mold.
- the method for producing reclaimed sand can be used for reclaiming sand that has been used in sand molds formed by methods other than the cold box method and the shell mold method.
- a soot sand mixed with additive components so-called resin-coated sand
- the additive component are a binder such as phenol resin, a curing accelerator such as hexamethylenetetramine, and a lubricant such as calcium stearate.
- Resin coated sand contains little water and contains 0.1 to 10% by weight of organic components.
- the reclaiming of the sand is merely meant to re-activate the sand used for smelting to a state where it can be reused for the formation of sand molds. It also means preparing the shark sand into a shark sand that can be used to form a sand jar. Examples of unused dredged sand are resin-coated sand with non-standard quality, unnecessary resin-coated sand, and resin-coated sand used in sand molds that have failed to be molded. An example of a resin-coated sand having non-standard quality is a resin-coated sand with poor strength.
- the binder used for forming the sand mold and the reclaimed sediment sand from which inorganic components mixed during the collection of the used sand sand are removed are obtained.
- This reclaimed dredged sand can be suitably reused to form a new sandstone mold.
- the method for producing reclaimed dredged sand according to the first embodiment regenerates the dredged sand by blowing air to the upper part of the furnace by supplying an air flow (blowing air) into the furnace while roasting the dredged sand.
- air flow blowing air
- the reclaiming process of dredged sand can be carried out by notch type or continuous type. General Therefore, it is efficient to perform the regeneration process continuously.
- the sand is roasted at 600 ° C or higher.
- a preferable roasting temperature is 700 ° C or higher, and a more preferable roasting temperature is 800 ° C or higher.
- the roasting temperature temperature of dredged sand
- the atmospheric temperature in the furnace may be regarded as the temperature of dredged sand.
- the wind speed is determined so that most grains of the glazed sand float on the upper portion of the roasting chamber and the glazed sand does not accumulate on the bottom of the roasting chamber.
- the sand is blown up in the furnace by an air flow having a wind speed of 0.8 mZs or more.
- the blown-up sand particles are polished by violent collision with each other.
- unnecessary components such as a binder adhering to the surface of the glazed sand particles are peeled off, and the shape and size of the glazed sand particles are adjusted.
- the wind speed of the air current is preferably lmZs or more, more preferably 1.5 mZs or more.
- the regenerator includes a circulating fluidized furnace 11 for roasting while circulating the sand.
- the circulating fluidized furnace 11 includes, for example, a roasting device 12 having a cylindrical roasting chamber, a separation device 13 (for example, a cyclone structure), a delivery pipe 14, and a blower connected to the bottom of the roasting device 12. And a blower 16 including a pipe.
- the blower 16 supplies an air flow to the roasting chamber through the blower pipe.
- a carry-in port 15 is provided for carrying the sand in the roasting room.
- the glazed sand is roasted in a roasting chamber by a panner (not shown).
- the communication pipe 17 communicates the upper part of the roasting chamber and the separation device 13.
- Separation device 13 separates combustion gas generated from roasting of the sediment sand and the sediment sand.
- the delivery pipe 14 communicates the lower part of the separation device 13 with the lower part of the roasting chamber. Grain sand particles separated from the combustion gas by the separator 13 pass through the delivery pipe 14. Returned to the roasting room.
- the communication pipe 17, the separation device 13, and the delivery pipe 14 function as a circulation path provided outside the roasting chamber.
- the dredged sand is preliminarily baked at 100 ° C or higher in a baking furnace (not shown).
- a predetermined amount of dredged sand is carried into the roasting device 12 through the carry-in entrance 15.
- the dredged sand may be carried into the roasting device 12 continuously or intermittently. In one embodiment, the input of the sand is 1 Ot per hour.
- the dredged sand carried into the roasting device 12 is blown up by the air flow supplied from the blower 16 while being roasted in the roasting device 12 by the heat of the panner.
- Unnecessary components such as a binder adhering to the sand are burned by roasting, and combustion gas is generated. Some organic components that cannot be removed from unnecessary components such as binders may remain on the surface of the sand particles. If green sand is mixed with the collected sand, bentonite contained in the green sand remains without being removed by roasting.
- the sand particles float up to the upper part of the roasting chamber by an air flow having a predetermined wind speed (0.8 mZs or more) and collide with each other violently. It is polished by colliding with the wall of the baking machine 12. Due to this collision, unnecessary components such as bentonite remaining in the sand are peeled off by the surface force of the sand.
- the wind speed of the air flow can be calculated by the following equation, which can be measured directly by installing a wind speed sensor in the roasting chamber.
- VI is the velocity of the air flow measured at measurement position A of the blower 16 blower tube.
- A1 is a cross-sectional area at the measurement position A of the blower tube of the blower 16.
- B is the area of the bottom of the roasting room.
- a part of the air flow blown up by the roasting device 12 is supplied again into the roasting device 12 from the roasting device 12 via the separation device 13 and the delivery pipe 14.
- the separation device 13 After some of the sand is blown up in the roasting device 12, it is sent to the separation device 13 through the communication pipe 17 together with the combustion gas.
- the separation device 13 separates the sediment sand from the combustion gas.
- the separated combustion gas is diffused to the atmosphere through a treatment device (not shown), and the separated sediment is sent to the roasting device 12 through the delivery pipe 14.
- the sand particles are collided with each other when moving through the communication pipe 17, the separation device 13, and the delivery pipe 14, which are not polished only in the roasting chamber. Polished. Further, the sand particles move while colliding with the inner surfaces of the communication pipe 17, the separator 13 and the delivery pipe 14. Therefore, the circulating fluidized furnace 11 can efficiently produce reclaimed sediment sand by continuously polishing the sediment sand.
- the regeneration process of the first embodiment includes blowing up the sand with an air flow having a wind speed of 0.8 mZs or more while roasting the sand in the roasting apparatus 12.
- the sand particles blown up by the air flow are sufficiently polished by the collision between the grains and the inner wall surface of the roasting device 12.
- unnecessary components such as a binder adhering to the surface of the glazed sand particles can be peeled off, and the shape of the glazed sand particles can be improved.
- the surface of the dredged sand grains is polished while roasted.
- the sand is roasted after it is roasted as in the conventional regeneration method. There is no need to perform a separate polishing step. That is, in the first embodiment, the roasting step and
- the polishing step is performed simultaneously. For this reason, the work process is simplified and the work time is shortened.
- the sediment sand is regenerated using the circulating fluidized furnace 11 in which the air flow circulates inside the roasting chamber.
- the sand particles are circulated at least once in the circulating fluidized furnace 11 while being polished by the air flow. Therefore, the circulating fluidized furnace 11 can efficiently polish the sand.
- the sand is roasted at a high temperature of 600 ° C or higher. For this reason, the organic components such as the binder adhering to the surface of the sediment sand are almost completely burned and removed from the sediment sand.
- the regenerator includes a roasting furnace 21.
- the roasting furnace 21 includes, for example, a roasting device 22 having a cylindrical roasting chamber and an air blower connected to the lower portion of the roasting device 22 that supplies an air flow with a wind speed of 0.8 mZs or more to the roasting chamber. Includes blower 16 with tube.
- the regenerator does not have a separator 13 (see Fig. 1).
- a carry-in port 15 is formed for carrying the clay sand into the roasting chamber.
- a panner (not shown) for roasting the sand is disposed on the side of the roasting device 22 .
- the dredged sand particles are blown up to the top of the roasting chamber and then dropped to the bottom of the roasting chamber without being sent to the separation device 13 (see Fig. 1).
- the roasting chamber has a relatively wide upper part and a relatively narrow lower part.
- the roasting room having a relatively wide upper portion has the effect of facilitating the floating and spreading of the sand and increasing the collision efficiency of the sand.
- Cargo sand is carried into the roasting chamber from the carry-in entrance 15 at a rate of 10 tons per hour.
- Blower 16 Force The sand is roasted by the heat of the panner while supplying an air flow with a wind speed of 8 mZs or more to the roasting chamber. Most of the sand grains are blown up to the upper part of the roasting chamber by air flow. The air velocity is measured or calculated as described in the first embodiment.
- the dredged sand was recovered from the sand mold used for the forging.
- the sediment sand It was carried into each of the circulating fluidized furnace 1 1 and the roasting furnace 21 having a processing capacity of 2 tZh.
- the reclaimed dredged sand was produced by roasting at 700 ° C for 1 hour while floating the dredged sand in the air flow.
- the particle size index is an index of the size of the sand grains.
- the particle size index was calculated according to the AFS coefficient standard defined in JACT test method S-1 (particle size test method for dredged sand). The higher the particle size index, the better the quality of the reclaimed sand because it is better polished.
- the loss on ignition is an indicator showing the degree of mass change of the sediment sand generated when pyrolyzing and burning. The smaller the loss on ignition, the less foreign material has adhered to the reclaimed sand.
- the ignition loss was measured in accordance with JACT test method S-2 (Test method for loss on ignition of dredged sand). Specifically, the free water in the sand is removed according to JIS Z 2601. Place 10 g (W) of accurately weighed sand in a crucible. This crucible is placed in an electric furnace preheated to 1000 ° C for 15 minutes.
- the flexural strength was rapidly improved by roasting the sand while floating the sand with an air flow of 0.8 mZs or higher.
- the resin-coated sand produced by reclaimed dredged sand that has been roasted while levitating the dredged sand with an air flow at a wind speed of 0.8 mZs or more is suitable for producing dredged molds having good strength.
- the wind speed is in the range of 1.5 to 3mZs
- Using the circulating fluidized furnace 11 rather than the roasting furnace 21 was reassuring that reclaimed clay sand capable of producing a mold with high bending strength could be obtained. The reason for this is presumed to be the force to obtain reclaimed clay sand with a small particle size because the impact force between the sand grains in the circulating fluidized furnace 11 is higher than that of the roasting furnace 21.
- a roasting furnace 21 having a roasting chamber with a volume of 40 m 3 was prepared.
- the amount of dredged sand carried into the roasting chamber was changed (0.5t, lt, 1.5t) to regenerate dredged sand.
- the physical properties of the reclaimed dredged sand were measured in the same manner as in Example 1.
- Example 1 The measured values of Example 1 were used for the physical properties of the regenerated dredged sand obtained when it was loaded. The results are shown in FIGS.
- the circulating fluidized furnace 11 in FIG. 1 and the roasting furnace 21 in FIG. The physical properties of the recycled dredged sand were measured. The effect of roasting temperature of dredged sand on the physical properties of reclaimed dredged sand was evaluated. The results are shown in Table 1 below.
- the sand temperature in the furnace in Table 1 is the temperature of the sand in the circulating fluidized furnace 11 and the roasting furnace 21.
- the amount of sand in the furnace is the mass of the sediment sand carried into the circulating fluidized furnace 11 and the roasting furnace 21.
- Test Example 1 where the sand temperature in the furnace was higher than Test Example 3, a slight improvement in physical properties was observed. The reason for this is presumed that by roasting the glazed sand at 900 ° C, unnecessary components such as binders that could not be removed at 700 ° C could be removed.
- the blower 16 of the blower 16 is not limited to the bottom of the roasting chamber, and may be connected to the upper part or the central part of the roasting apparatuses 12 and 22. In this case, the grains of the glazed sand collide with each other more frequently and with a higher collision force by the air flow supplied from various directions in the roasting chamber. Therefore, the polishing effect is improved.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
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Priority Applications (1)
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JP2006531759A JP4377916B2 (ja) | 2004-08-20 | 2005-08-12 | 再生鋳物砂を製造する方法及び装置 |
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JP2004240313 | 2004-08-20 | ||
JP2004-240313 | 2004-08-20 |
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WO2006019047A1 true WO2006019047A1 (ja) | 2006-02-23 |
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PCT/JP2005/014821 WO2006019047A1 (ja) | 2004-08-20 | 2005-08-12 | 再生鋳物砂を製造する方法及び装置 |
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JP (1) | JP4377916B2 (ja) |
CN (1) | CN100558486C (ja) |
MY (1) | MY146740A (ja) |
TW (1) | TW200618890A (ja) |
WO (1) | WO2006019047A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017077570A (ja) * | 2015-10-20 | 2017-04-27 | マツダ株式会社 | 鋳物砂の再生方法 |
JP7364762B1 (ja) | 2022-10-07 | 2023-10-18 | 旭有機材株式会社 | 再生砂原料組成物及びその製造方法、並びに再生砂及びレジンコーテッドサンドの製造方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102788501A (zh) * | 2012-08-31 | 2012-11-21 | 无锡锡南铸造机械有限公司 | 节能环保型高温流化床焙烧炉 |
KR20180018569A (ko) * | 2015-06-11 | 2018-02-21 | 신토고교 가부시키가이샤 | 주형사의 재생 방법 및 재생 설비 |
CN111468673B (zh) * | 2020-04-24 | 2021-06-25 | 南阳仁创砂业科技有限公司 | 一种铸造旧砂的再生方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53106385A (en) * | 1977-02-28 | 1978-09-16 | Hitachi Metals Ltd | Method and apparatus for fluidizedly baking powder |
JPS63180340A (ja) * | 1987-01-22 | 1988-07-25 | Nippon Kokan Keishiyu Kk | 鋳物砂の再生方法 |
JPH07314080A (ja) * | 1994-05-27 | 1995-12-05 | Kawasaki Heavy Ind Ltd | 鋳物砂再生方法 |
JPH11285779A (ja) * | 1998-03-31 | 1999-10-19 | Osaka Gas Co Ltd | 鋳物砂再生方法 |
-
2005
- 2005-08-12 TW TW094127521A patent/TW200618890A/zh unknown
- 2005-08-12 WO PCT/JP2005/014821 patent/WO2006019047A1/ja active Application Filing
- 2005-08-12 JP JP2006531759A patent/JP4377916B2/ja not_active Expired - Fee Related
- 2005-08-12 MY MYPI20053783A patent/MY146740A/en unknown
- 2005-08-12 CN CNB2005800276379A patent/CN100558486C/zh not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53106385A (en) * | 1977-02-28 | 1978-09-16 | Hitachi Metals Ltd | Method and apparatus for fluidizedly baking powder |
JPS63180340A (ja) * | 1987-01-22 | 1988-07-25 | Nippon Kokan Keishiyu Kk | 鋳物砂の再生方法 |
JPH07314080A (ja) * | 1994-05-27 | 1995-12-05 | Kawasaki Heavy Ind Ltd | 鋳物砂再生方法 |
JPH11285779A (ja) * | 1998-03-31 | 1999-10-19 | Osaka Gas Co Ltd | 鋳物砂再生方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017077570A (ja) * | 2015-10-20 | 2017-04-27 | マツダ株式会社 | 鋳物砂の再生方法 |
JP7364762B1 (ja) | 2022-10-07 | 2023-10-18 | 旭有機材株式会社 | 再生砂原料組成物及びその製造方法、並びに再生砂及びレジンコーテッドサンドの製造方法 |
Also Published As
Publication number | Publication date |
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CN100558486C (zh) | 2009-11-11 |
CN101005909A (zh) | 2007-07-25 |
TW200618890A (en) | 2006-06-16 |
JP4377916B2 (ja) | 2009-12-02 |
JPWO2006019047A1 (ja) | 2008-07-31 |
MY146740A (en) | 2012-09-14 |
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