WO2021220585A1 - 鋳物砂再生方法 - Google Patents

鋳物砂再生方法 Download PDF

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Publication number
WO2021220585A1
WO2021220585A1 PCT/JP2021/005539 JP2021005539W WO2021220585A1 WO 2021220585 A1 WO2021220585 A1 WO 2021220585A1 JP 2021005539 W JP2021005539 W JP 2021005539W WO 2021220585 A1 WO2021220585 A1 WO 2021220585A1
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WIPO (PCT)
Prior art keywords
sand
casting sand
casting
inorganic binder
regeneration method
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Application number
PCT/JP2021/005539
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English (en)
French (fr)
Japanese (ja)
Inventor
吉明 横山
篤 須藤
Original Assignee
ヤマハ発動機株式会社
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Application filed by ヤマハ発動機株式会社 filed Critical ヤマハ発動機株式会社
Priority to JP2021557251A priority Critical patent/JP7171944B2/ja
Priority to CN202180004478.XA priority patent/CN114080284B/zh
Publication of WO2021220585A1 publication Critical patent/WO2021220585A1/ja
Priority to JP2022126771A priority patent/JP2022145836A/ja

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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
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • 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
    • 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
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying

Definitions

  • the present invention relates to a method for regenerating cast sand, and more particularly to a method for regenerating used cast sand having an inorganic binder adhered to its surface.
  • Casting sand is recovered from the sand mold used for casting, regenerated to remove the binder adhering to the surface of the casting sand, and then used again for casting as recycled casting sand.
  • Binders used for forming sand molds are roughly classified into organic binders such as phenol resins and furan resins and inorganic binders such as sodium silicate (water glass).
  • Inorganic binders are generally more difficult to remove from the surface of cast sand than organic binders.
  • the organic binder adhering to the surface of the foundry sand can be removed by roasting, but the inorganic binder cannot be removed by roasting.
  • the inorganic binder adhering to the surface can be removed to some extent, but in that case, the sand surface becomes uneven or the sand itself is crushed. .. Therefore, when an inorganic binder is used, the recyclability of the foundry sand is worse than when an organic binder is used. Furthermore, it is difficult to chemically remove the inorganic binder using chemicals or the like.
  • Patent Document 1 a regeneration method capable of suitably regenerating cast sand having an inorganic binder adhered to its surface.
  • the reproduction method disclosed in Patent Document 1 includes the following steps (1) to (4). (1) A crushing step in which the recovered casting sand mold is crushed into crushed casting sand. (2) A mixing step of separating the inorganic binder adhering to the surface from the foundry sand by mixing and stirring the obtained crushed foundry sand in water at 5 ° C. to 70 ° C. (3) A step of collecting the foundry sand from which the inorganic binder has been separated and heating and drying the foundry sand while stirring. (4) A step of removing fine powder from the cast sand that has been heat-dried.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a casting sand regeneration method in which the amount of sand adhered to a casting is unlikely to increase even if the casting sand having an inorganic binder adhered to the surface is repeatedly recycled. To provide.
  • the casting sand regeneration method described in the following items is provided.
  • [Item 1] It is a casting sand regeneration method that regenerates used casting sand with an inorganic binder attached to the surface.
  • a crushing process that crushes the sand mold used for casting and collects the foundry sand, After the crushing step, a washing step of washing the foundry sand in water at 5 ° C. or higher and 100 ° C. or lower with stirring, and a washing step. After the washing step, a heat treatment step of heating the foundry sand to 550 ° C. or higher and 900 ° C. or lower, and a heat treatment step.
  • a method for reclaiming foundry sand including.
  • the casting sand regeneration method according to the embodiment of the present invention includes a heat treatment step of heating the casting sand to 550 ° C. or higher and 900 ° C. or lower after the washing step, the casting sand remains on the casting sand and its surface by this heat treatment step. It is possible to eliminate (that is, anhydrous) the water existing between the inorganic binder and the crystalline water contained in the inorganic binder. Therefore, when casting is performed using a sand mold formed of casting sand regenerated by the casting sand regeneration method according to the embodiment of the present invention, it is possible to prevent the casting sand from sticking to the casting due to moisture. ..
  • the heat treatment step is performed while moving the casting sand, it is possible to prevent adjacent sands from binding to each other due to the softened inorganic binder.
  • the solubility of the inorganic binder can be sufficiently increased.
  • the preheating time in the subsequent process can be shortened.
  • the preheating time in the subsequent process can be further shortened.
  • a drying step may be performed in which the casting sand is heated to 100 ° C. or higher and 300 ° C. or lower while stirring to dry it.
  • the drying step it is possible to easily obtain dry sand having a smooth surface while forming a film of residual binder on the sand surface.
  • the installation area of the entire equipment required for recycling the foundry sand can be reduced.
  • the amount of regeneration per unit time can be increased.
  • the inorganic binder one containing sodium silicate (water glass) can be preferably used.
  • sodium silicate those represented by the general formula: Na 2 O ⁇ nSiO 2 (n is 0.5 or more and 4.0 or less) can be preferably used.
  • the inorganic binder has the general formula: xSiO 2 ⁇ yM 2 O ⁇ zH 2 O (M is Li +, K + or Na +) is formed from an alkali silicate aqueous solution represented by, A sodium-containing substance is added to the inorganic binder as a hygroscopic agent so that the mass ratio of the sodium-containing substance to the alkaline silicate aqueous solution is in the range of 1: 4 to 1: 6. Silicone oil having a boiling point of 250 ° C.
  • Inorganic binder the general formula: xSiO 2 ⁇ yM 2 O ⁇ zH 2 O (M is Li +, K + or Na +) formed from alkali silicate aqueous solution represented by, a water glass-based binder May be good.
  • a hygroscopic agent is added to the inorganic binder.
  • a sodium-containing substance can be used as the hygroscopic agent.
  • the mass ratio of the sodium-containing substance to the aqueous alkali silicate solution is preferably in the range of 1: 4 to 1: 6.
  • the mass ratio of the sodium-containing substance to the alkaline silicate aqueous solution is in the range of 1: 4 to 1: 6, for example, the mass ratio of Na 2 O and SiO 2 in the alkaline silicate aqueous solution (Na 2 O / SiO).
  • 2 is 2.5 or more and 3.5 or less (solid content is 20% or more and 40% or less), it is possible to prevent the inorganic binder from curing at an early stage.
  • a surfactant is added to the inorganic binder in order to preferably control the hygroscopicity.
  • silicone oil having a boiling point of 250 ° C. or higher is added as a surfactant in the form of an emulsion, and the content of silicone oil in the emulsion is 8% or more and 10% or less of the mass of the binder. More preferably.
  • a casting sand regeneration method in which the amount of sand adhered to a cast product is unlikely to increase even if the casting sand having an inorganic binder adhered to the surface is repeatedly regenerated.
  • the inventor of the present application causes the adhesion of sand to be caused by the moisture existing between the inorganic binder (residual binder) adhering to the surface of the casting sand and the sand. , It was found that it was caused by the water of crystallization contained in the residual binder.
  • the present invention has been made based on the above findings.
  • the mechanism of sand adhesion and the method for regenerating cast sand according to the embodiment of the present invention will be described.
  • sand adhesion occurs by the following mechanism.
  • the binder component is heated to 600 ° C. or higher to soften, and the water remaining between the sand and the residual binder and the water of crystallization contained in the residual binder become the softened binder component. It reacts and becomes water vitrification.
  • the carbon dioxide generated between the sand and the residual binder and the carbon dioxide in the sand mold are absorbed by the water-glass binder and gelled (sodium carbonate is generated at this time). After that, it is considered that sand adheres to the surface of the cast product due to the hardening of the binder while adhering to the aluminum alloy.
  • the adhesion of sand is caused by the water existing between the inorganic binder (residual binder) adhering to the surface of the cast sand and the sand, and the water of crystallization contained in the residual binder.
  • FIG. 1 is a flowchart showing one aspect of the casting sand regeneration method according to the embodiment of the present invention.
  • the casting sand regeneration method according to the embodiment of the present invention is a method for regenerating used casting sand having an inorganic binder adhered to the surface.
  • ⁇ Casting sand> As the casting sand, various known refractory granular materials can be used without particular limitation. For example, silica sand, chromate sand, zircon sand, olivine sand, synthetic mullite sand and alumina-based aggregate particles can be used. These granular materials may be used alone or in combination of two or more. Among the granular materials exemplified here, alumina-based aggregate particles are preferable from the viewpoint of filling property into a molding die and sand mold disintegration property after casting.
  • the casting sand may be fresh sand, recycled sand that has been regenerated once or multiple times, or a mixture of fresh sand and recycled sand.
  • the mass of the fresh sand is, for example, 0.01 times or more and 10 times or less, preferably 0.1 times or more and 10 times or less, and more preferably 1 time or more and 10 times or less the mass of the regenerated sand. be.
  • Inorganic binder for example, sodium silicate (water glass), clay, silica sol, sulfate, phosphate and nitrate can be used. Inorganic binders as illustrated here may be used alone or in combination of two or more.
  • sodium silicate is preferable, and sodium silicate represented by the general formula: Na 2 O ⁇ nSiO 2 (n is 0.5 or more and 4.0 or less) is more preferable.
  • the sodium silicates include sodium silicate No.
  • the inorganic binder has the general formula: xSiO 2 ⁇ yM 2 O ⁇ zH 2 O (M is Li +, K + or Na +) formed from alkali silicate aqueous solution represented by the water glass based binder There may be.
  • a moisture absorbing agent or a moisture imparting agent
  • a sodium-containing substance can be used as the hygroscopic agent.
  • the mass ratio of the sodium-containing substance to the aqueous alkali silicate solution is preferably in the range of 1: 4 to 1: 6.
  • the mass ratio of the sodium-containing substance to the alkaline silicate aqueous solution is in the range of 1: 4 to 1: 6, for example, the mass ratio of Na 2 O and SiO 2 in the alkaline silicate aqueous solution (Na 2 O / SiO).
  • the mass ratio of Na 2 O and SiO 2 in the alkaline silicate aqueous solution Na 2 O / SiO.
  • solid content is 20% or more and 40% or less
  • a surfactant is added to the inorganic binder in order to preferably control the hygroscopicity (moisture imparting property).
  • silicone oil having a boiling point of 250 ° C. or higher is added as a surfactant in the form of an emulsion, and the content of silicone oil in the emulsion is 8% or more and 10% or less of the mass of the binder. More preferably.
  • the amount of the inorganic binder added is preferably 0.2% by mass or more and 10% by mass or less, and more preferably 0.5% by mass or more and 5% by mass or less with respect to the cast sand. preferable.
  • the sand mold used for casting is crushed to recover the casting sand (crushing step s1).
  • the method for crushing the sand mold is not particularly limited, and various known crushing methods can be used. For example, crushing can be performed by a crusher.
  • crushing can be performed by a crusher.
  • fine granulation is performed using a sand fresher or the like.
  • the casting sand is washed with stirring in water at 5 ° C. or higher and 100 ° C. or lower (water washing step s2).
  • water washing step s2 water washing step 2
  • the amount of water used is not particularly limited as long as the inorganic binder adhering to the casting sand can be removed to some extent, and is preferably 0.5 times or more and 100 times or less the mass of the casting sand, for example. Is 0.5 times or more and 50 times or less, and more preferably 1 time or more and 30 times or less.
  • the stirring method is not particularly limited as long as the inorganic binder adhering to the casting sand can be removed to some extent, and a known stirring method can be used.
  • stirring can be preferably performed by a stirrer (mixer).
  • the rotation speed of the stirrer is, for example, 30 rpm or more and 300 rpm or less, preferably 40 rpm, from the viewpoint of sufficiently removing the inorganic binder adhering to the casting sand and preventing the particle size of the casting sand from becoming uneven due to stirring. More than 250 rpm or less, more preferably 50 rpm or more and 200 rpm or less.
  • the stirring time is, for example, 5 minutes or more and 60 minutes or less, preferably 10 minutes or more and 50 minutes or less, and more preferably 15 minutes or more and 40 minutes or less.
  • the number of rotations and the stirring time when stirring with the stirrer can be appropriately set from the above range according to the specifications of the stirrer, the type of casting sand and the inorganic binder, and the like.
  • ⁇ Dehydration process> Subsequently, most of the water used in the washing step s2 is separated and removed from the casting sand (dehydration step s3).
  • the dehydration method is not particularly limited as long as most of the water can be separated and removed from the casting sand, and a known dehydration method can be used.
  • a container that has a drainage port provided with a wire mesh or the like to prevent sand from flowing out and an air introduction hole for introducing compressed air, and can seal other than the drainage port and the air introduction hole.
  • Water that is held between sand grains by putting sand containing water after washing with water into this container and introducing compressed air (for example, 0.2 MPa or less) into the container through the air introduction hole while the sand is stationary. Can be easily dehydrated.
  • the casting sand is heated to 100 ° C. or higher and 300 ° C. or lower while stirring to dry (drying step s4).
  • the sand after dehydration can be dried by applying hot air, microwaves, superheated steam, or the like to the sand while stirring the sand. As a result, it is possible to obtain dry sand having a spherical smooth surface while forming a film of the residual binder component on the sand surface.
  • the casting sand is cooled to a predetermined temperature (for example, 60 ° C.) while being ventilated (cooling step s5). Cooling can be performed by, for example, applying cold air to the foundry sand.
  • the foundry sand is heated to 550 ° C. or higher and 900 ° C. or lower (heat treatment step s6).
  • the heat treatment is not particularly limited as long as the cast sand can be heated to 550 ° C. or higher and 900 ° C. or lower.
  • a kiln is used as a device for performing heat treatment, it is possible to heat the casting sand to 550 ° C. or higher and 900 ° C. or lower while moving the casting sand.
  • the heat treatment time is set as appropriate.
  • the surface of the sand after the heat treatment may be confirmed with an electron microscope, and the heat treatment time may be set so that the surface is in an appropriate state.
  • the heat-treated sand may be put into water and the heat treatment time may be set so that the concentration of the dissolved sodium ions becomes appropriate.
  • FIG. 2 shows an example of the kiln used in the heat treatment step s6.
  • the kiln (rotary kiln) 10 shown in FIG. 2 includes a body portion (kiln body) 11, a spiral blade (feeder) 12 provided in the body portion 11, and a burner 13 for heating the inside of the body portion 11.
  • a body portion kiln body
  • a spiral blade feeder
  • a burner 13 for heating the inside of the body portion 11.
  • an introduction port 11a for introducing the object to be processed 1 (here, cast sand) into the body portion 11 is provided, and at the other end, the object to be processed 1 is introduced into the body portion 11.
  • a discharge port 11b is provided for discharging from the outside.
  • the kiln 10 is a device that heat-treats the object to be processed 1 introduced from the introduction port 11a while rotating the spiral blade 12, transfers the obtained heat-treated object, and discharges the heat-treated object from the discharge port. By using such a kiln 10, heat treatment can be performed while moving the casting sand. Note that FIG. 2 illustrates a configuration in which the object to be processed 1 is directly exposed to the flame of the burner 13, but the kiln 10 is not limited to such a configuration.
  • a predetermined amount for example, 5% by mass
  • the mixing step s7 is performed for the purpose of adjusting the particle size and replenishing the depleted portion.
  • a binder inorganic binder
  • kneaded sand kneading step s8
  • the casting sand regeneration method according to the embodiment of the present invention includes the heat treatment step s6 for heating the casting sand to 550 ° C. or higher and 900 ° C. or lower after the water washing step s2.
  • Moisture present between the sand and the inorganic binder remaining on its surface and crystalline water contained in the inorganic binder can be eliminated (that is, anhydrous, or in other words, minimized). Therefore, when casting is performed using a sand mold formed of casting sand regenerated by the casting sand regeneration method according to the embodiment of the present invention, it is possible to prevent the casting sand from sticking to the casting due to moisture. ..
  • the heat treatment step is performed while moving the casting sand (for example, while stirring or vibrating), it is possible to prevent adjacent sands from being bonded to each other by the softened inorganic binder. It is preferable to keep the casting sand running until the casting sand is below 550 ° C.
  • the water temperature in the water washing step is preferably 20 ° C. or higher and 100 ° C. or lower.
  • the solubility of the inorganic binder can be sufficiently increased.
  • the preheating time in the subsequent process can be shortened.
  • the water temperature in the water washing step is more preferably 80 ° C. or higher and 100 ° C. or lower.
  • the preheating time in the subsequent step can be further shortened.
  • the heat treatment step s6 substantially also serves as the drying step s4, so that the drying step s4 (and cooling) is as shown in FIG. Step s5) may be omitted.
  • the heat treatment step s6 can substantially also serve as the drying step s4.
  • the energy required for the drying step s4 can be reduced.
  • the water washing step s2, the dehydration step s3, and the drying step s4 may be performed in the same equipment or in different equipment.
  • the installation area of the entire equipment required for recycling the casting sand can be reduced.
  • the dehydration step s3, and the drying step s4 are performed in different facilities, the amount of regeneration per unit time can be increased.
  • the hot air between the hopper and the sand grains may cool and cause dew condensation. Blocking occurs when the moisture generated by this condensation reacts with the residual binder on the surface of the sand. If a cooling step s5 for cooling the casting sand while ventilating is performed between the drying step s4 and the heat treatment step s6, dew condensation on the casting sand can be prevented. Therefore, the occurrence of blocking described above can be prevented.
  • a drainage port configured to prevent sand from flowing out with a wire mesh filter was provided on the bottom of the mixer described above, and valves were closed except for the air introduction hole and drainage port for introducing compressed air so that they could be sealed. After washing with water and stopping the impeller, the valves other than the air introduction hole were closed and the valve at the drain port was opened, and 0.2 MPa of compressed air was introduced into the mixer through the air introduction hole. Dehydration was performed to a water content of 5 to 10% by introducing compressed air for 20 minutes.
  • the foundry sand after the drying step was put into a rotary kiln manufactured by Enshu Iron Works, heated at 750 ° C. for 10 minutes, cooled to 500 ° C., and then the foundry sand was recovered.
  • the cylinder head was cast by gravity casting using a casting core.
  • Aluminum alloy AC4B was used as the material of the cylinder head.
  • the obtained cylinder head was attached to a knockout machine manufactured by Yommer, and hit and rocked for 30 seconds.
  • Tables 1 and 4 show the results of measuring the amount of sand adhering to the surface of the casting for Examples, Comparative Examples, and Reference Examples.
  • the casting sand recycling method is a casting sand recycling method for regenerating used casting sand 1 having an inorganic binder attached to the surface, and crushes the sand mold used for casting.
  • the casting sand 1 is washed with stirring in water at 5 ° C. or higher and 100 ° C. or lower.
  • the heat treatment step s6 for heating the casting sand 1 to 550 ° C. or higher and 900 ° C. or lower is included.
  • the casting sand regeneration method according to the embodiment of the present invention includes a heat treatment step s6 for heating the casting sand 1 to 550 ° C. or higher and 900 ° C. or lower after the water washing step s2. It is possible to eliminate (that is, anhydrous) the water existing between the inorganic binder and the inorganic binder remaining on the surface and the crystalline water contained in the inorganic binder. Therefore, when casting is performed using a sand mold formed of casting sand 1 regenerated by the casting sand regeneration method according to the embodiment of the present invention, it is necessary to prevent the casting sand 1 from sticking to the casting due to moisture. Can be done.
  • the heat treatment step s6 is performed while moving the casting sand 1.
  • the water temperature in the water washing step s2 is 20 ° C. or higher and 100 ° C. or lower.
  • the solubility of the inorganic binder can be sufficiently increased.
  • the preheating time in the subsequent process can be shortened.
  • the water temperature in the water washing step s2 is 80 ° C. or higher and 100 ° C. or lower.
  • the preheating time in the subsequent step can be further shortened.
  • the casting sand regeneration method involves a drying step s4 in which the casting sand 1 is heated to 100 ° C. or higher and 300 ° C. or lower while stirring between the water washing step s2 and the heat treatment step s6. Further include.
  • a drying step s4 may be performed in which the casting sand 1 is heated to 100 ° C. or higher and 300 ° C. or lower while stirring and dried.
  • the drying step s4 it is possible to easily obtain dry sand having a smooth surface while forming a film of residual binder on the sand surface.
  • the casting sand regeneration method is a dehydration step of separating and removing most of the water used in the washing step s2 from the casting sand 1 between the washing step s2 and the drying step s4. Further includes s3.
  • the energy required for the drying step s4 can be reduced.
  • the washing step s2, the dehydration step s3, and the drying step s4 are performed in the same equipment.
  • the installation area of the entire equipment required for the regeneration of the casting sand 1 can be reduced.
  • the washing step s2, the dehydration step s3, and the drying step s4 are performed in different facilities.
  • the amount of regeneration per unit time can be increased.
  • the casting sand regeneration method further includes a cooling step s5 for cooling the casting sand 1 while ventilating between the drying step s4 and the heat treatment step s6.
  • the inorganic binder comprises soda silicate.
  • the inorganic binder one containing sodium silicate (water glass) can be preferably used.
  • the sodium silicate is represented by the general formula: Na 2 O ⁇ nSiO 2 (n is 0.5 or more and 4.0 or less).
  • sodium silicate those represented by the general formula: Na 2 O ⁇ nSiO 2 (n is 0.5 or more and 4.0 or less) can be preferably used.
  • the inorganic binder is formed from an aqueous alkali silicate solution represented by the general formula: xSiO 2 ⁇ yM 2 O ⁇ zH 2 O (M is Li + , K + or Na +).
  • a sodium-containing substance is added to the inorganic binder as a hygroscopic agent so that the mass ratio of the sodium-containing substance to the alkaline silicate aqueous solution is in the range of 1: 4 to 1: 6, and the inorganic binder is added.
  • silicon oil having a boiling point of 250 ° C. or higher is added as a surfactant in the form of an emulsion, and the content of the silicon oil in the emulsion is 8% or more and 10% or less of the mass of the inorganic binder.
  • Inorganic binder the general formula: xSiO 2 ⁇ yM 2 O ⁇ zH 2 O (M is Li +, K + or Na +) formed from alkali silicate aqueous solution represented by, a water glass-based binder May be good.
  • a hygroscopic agent is added to the inorganic binder.
  • a sodium-containing substance can be used as the hygroscopic agent.
  • the mass ratio of the sodium-containing substance to the aqueous alkali silicate solution is preferably in the range of 1: 4 to 1: 6.
  • the mass ratio of the sodium-containing substance to the alkaline silicate aqueous solution is in the range of 1: 4 to 1: 6, for example, the mass ratio of Na 2 O and SiO 2 in the alkaline silicate aqueous solution (Na 2 O / SiO).
  • 2 is 2.5 or more and 3.5 or less (solid content is 20% or more and 40% or less), it is possible to prevent the inorganic binder from curing at an early stage.
  • a surfactant is added to the inorganic binder in order to preferably control the hygroscopicity.
  • silicone oil having a boiling point of 250 ° C. or higher is added as a surfactant in the form of an emulsion, and the content of silicone oil in the emulsion is 8% or more and 10% or less of the mass of the binder. More preferably.
  • a casting sand regeneration method in which the amount of sand adhered to a cast product is unlikely to increase even if the casting sand having an inorganic binder adhered to the surface is repeatedly regenerated.

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  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
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PCT/JP2021/005539 2020-04-27 2021-02-15 鋳物砂再生方法 WO2021220585A1 (ja)

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JP2021557251A JP7171944B2 (ja) 2020-04-27 2021-02-15 鋳物砂再生方法
CN202180004478.XA CN114080284B (zh) 2020-04-27 2021-02-15 铸造用砂再生方法
JP2022126771A JP2022145836A (ja) 2020-04-27 2022-08-09 鋳物砂再生方法

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CN114130949A (zh) * 2021-12-10 2022-03-04 南阳仁创再生资源有限公司 一种降低水洗铸造陶粒砂灼减量的再生方法

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KR102539289B1 (ko) 2023-04-17 2023-06-08 피케이밸브앤엔지니어링 주식회사 폐주물사의 재생 방법 및 이로부터 제조된 재생 주물사

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