EP3586995B1 - Procédé de préparation d'un mélange de sable de fonderie - Google Patents

Procédé de préparation d'un mélange de sable de fonderie Download PDF

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Publication number
EP3586995B1
EP3586995B1 EP18180868.4A EP18180868A EP3586995B1 EP 3586995 B1 EP3586995 B1 EP 3586995B1 EP 18180868 A EP18180868 A EP 18180868A EP 3586995 B1 EP3586995 B1 EP 3586995B1
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EP
European Patent Office
Prior art keywords
cleaning water
sand
moulding
work step
foundry sand
Prior art date
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EP18180868.4A
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German (de)
English (en)
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EP3586995A1 (fr
EP3586995B2 (fr
Inventor
Alexander MOKRE
Mark ENSINGER
Walter Hartl
Viktoria DARGAI
Bettina RITT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nemak SAB de CV
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Nemak SAB de CV
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Application filed by Nemak SAB de CV filed Critical Nemak SAB de CV
Priority to ES18180868T priority Critical patent/ES2874204T5/es
Priority to PL18180868.4T priority patent/PL3586995T5/pl
Priority to EP18180868.4A priority patent/EP3586995B2/fr
Priority to HUE18180868A priority patent/HUE054926T2/hu
Priority to BR112020026856-9A priority patent/BR112020026856B1/pt
Priority to MX2020014218A priority patent/MX2020014218A/es
Priority to US17/256,280 priority patent/US11707777B2/en
Priority to JP2020572871A priority patent/JP2021529667A/ja
Priority to KR1020207036136A priority patent/KR20210010908A/ko
Priority to PCT/IB2019/055584 priority patent/WO2020003277A1/fr
Priority to CN201980043992.7A priority patent/CN112512723A/zh
Publication of EP3586995A1 publication Critical patent/EP3586995A1/fr
Publication of EP3586995B1 publication Critical patent/EP3586995B1/fr
Publication of EP3586995B2 publication Critical patent/EP3586995B2/fr
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Classifications

    • 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
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials
    • B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
    • 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
    • B22C5/0463—Plants
    • 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
    • B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
    • 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 invention relates to a method for recovering molding sand from a foundry sand mixture, which comprises at least a portion of molded material fragments or loose molding material grains that arise from the molding sand when a casting is removed from a casting mold as a result of the destruction of the casting cores or moldings depicting the casting (F) and an inorganic binder and optionally one or more additives for adjusting the properties of the molding material have been molded.
  • the foundry sand mixture is mixed with cleaning water to form a slurry in order to detach the inorganic binder residues contained in the foundry sand mixture and optionally present additives from the molding sand and to rinse them out of the foundry sand mixture.
  • the cleaning water contaminated with the inorganic binder residues is then separated from the molding sand contained in the slurry.
  • the first comminution of the core and molded part fragments is intended to separate impurities that adhere to the molding sand grains from which the relevant cores and molded parts were formed from the molding sand grains as far as possible. By then adding water to the fragments comminuted in this way, the impurities contained therein should be able to be removed and the individual constituents of the mixture can be fed to their respective intended further processing.
  • Another known prior art document is that DE102005041519 .
  • the temperature window specified by the invention is set in such a way that the preparation of the foundry sand mixture can be integrated into a water- and energy-saving cycle.
  • the invention allows the process temperature and the process times to be coordinated with one another in such a way that an effective treatment of the foundry sand is possible with minimal costs. Practical tests have shown that at process temperatures that lie in a temperature window of 80-100 ° C, the molding sand can be separated from the inorganic binder in particularly short process times.
  • the mixing of the foundry sand mixture with the cleaning water to form a slurry and the associated dissolving and rinsing out of the inorganic binder residues (step a) of the method according to the invention) can typically be done within 5 min-60 min.
  • the foundry sand mixture intended for the preparation according to the invention contains predominantly coarse fragments
  • all devices known from the prior art for this purpose such as a lump crusher or the like, are suitable.
  • waste heat is available from another process section of the method according to the invention or from a process in the plant in which the method according to the invention is also used, which would otherwise remain unused, it can, with regard to the minimization of the According to the invention provided temperature control necessary effort be expedient to preheat the foundry sand mixture before mixing with the cleaning water.
  • the heating devices provided for heating the cleaning water or the slurry to the respective process temperature can be designed for small outputs and can be implemented and operated at correspondingly low costs.
  • the contaminated water can run through work step a) again.
  • This reuse can be repeated, for example, until the solubility of the binder in the contaminated water is reached, i.e. so much binder is dissolved in the water that no further binder can be dissolved, or the proportion of suspended matter predominates, i.e. the pollution of the water in it transported foreign bodies has increased so much that no cleaning effect is achieved when rinsing the molding sand with the contaminated water.
  • the foundry sand mixture can pass through a heat exchanger before step a) through which contaminated and still warm cleaning water separated from the molding sand in step b) is passed in order to preheat the foundry sand mixture.
  • This variant is particularly expedient if the cleaning water obtained in step b), possibly previously reused several times, is so contaminated that it is no longer sensible to reuse it.
  • the fresh cleaning water supplied in each case can also be heated by means of an additional heat source, for example by means of a flow heater or the like, so that the slurry formed in step a) by mixing with the optionally also preheated foundry sand mixture reaches a process temperature that in accordance with the invention prescribed range.
  • the molding sand obtained from the foundry sand mixture, freed from the binder and the other residues, can be dried in the usual way, dedusted if necessary and divided into different grain size classes.
  • the molding sand is to be able to be used for a broader range of applications, in particular those in which molding materials with organic binders are to be provided, it is advisable to use the molding sand after the removal of the residues of the inorganic binder (step b)) according to the invention subject to additional treatment in which its pH is adjusted to values of 5-9, preferably 6.5-8.5, in particular when the molding sand obtained in step b) is used for molding materials with an organic binder should, the pH of the molding sand is optimally adjusted to 7 - 8.
  • the molding sand can be rinsed or wetted with a neutralizing solution.
  • a neutralizing solution such as, for example, water-diluted hydrochloric acid, sulfuric acid or organic acids (carbonic acid, citric acid), are suitable as the neutralizing solution.
  • buffer substances such as carbonate buffers (e.g. sodium hydrogen carbonate) can also be used for neutralization.
  • the molding sand can be stirred with the neutralizing solution.
  • stirring devices and the like are available on the market.
  • the molding sand can go through a rinsing step to remove excess neutralizing solution.
  • the molding sand obtained according to the invention must be sufficiently dry.
  • the molding sand obtained in step b) can be dried by supplying heat, typical drying temperatures being in the range of 80-800.degree.
  • drying temperatures are less than 500 ° C, in particular 100-300 ° C , suitable, whereby temperatures of 200 - 250 ° C are particularly practical.
  • this annealing treatment can also be carried out in the course of the drying step.
  • the molding sand obtained by the preparation according to the invention can be subjected to a classification in which it is divided depending on the size of its grains. At the same time, the molding sand can be dedusted to ensure that it is optimally suited for the production of molding material.
  • the figure shows schematically a workflow in the preparation of a foundry sand mixture, as it typically occurs in a casting operation, in which from a light metal melt, in particular an Al or Al alloy melt, not shown here cast parts, such as components for vehicles, in a conventional manner from casting molds, also not shown here, are produced by casting.
  • a light metal melt in particular an Al or Al alloy melt
  • cast parts such as components for vehicles, in a conventional manner from casting molds, also not shown here, are produced by casting.
  • casting molds include casting cores or molded parts which are formed from a molding material which contain a molding sand that has been tried and tested in practice and an inorganic binder that has also proven itself, for example water glass.
  • the binder is activated in the usual way by supplying heat in order to ensure the dimensionally stable cohesion of the grains of the molding sand.
  • Another part of the casting molds contains casting cores or molded parts which are formed from a molding material, which has a molding sand that has been tried and tested in practice and an organic binder that has also proven itself contain.
  • a chemical reaction of the binder is brought about by supplying a reaction medium, for example a gas, through which the binder develops its solidifying effect and ensures the dimensionally stable cohesion of the granules of the molding sand.
  • the foundry sand mixture G can also contain customary additives that are added in practice for the production of cores or molded parts, for example to ensure optimum flow behavior during the molding of the respective core or molded part ("core shooting").
  • a proportion of FAB of fragments or grains that originate from molded parts or casting cores made of molding material with an inorganic binder and a proportion of FOB of fragments or grains that originate from molded parts or casting cores made of molding material with an organic binder originate in the in Fig. 1 the processing process shown.
  • the foundry sand mixture G first passes through a grain separation device 1 in which the coarse fragments contained in the foundry sand mixture G are comminuted in a manner known per se until only grains and smaller fragments are present.
  • the granular foundry sand mixture G which is optionally preheated in a heat exchanger (not shown here), is introduced into a mixing device 2 with the aid of gravity or, for example, with the aid of compressed air.
  • the foundry sand mixture G is flowed through or stirred with the aid of a fluidized bed or a stirrer with cleaning water RW previously heated, for example in a flow heater, in order to form a slurry S.
  • the slurry S the inorganic binder residues sticking to the grains dissolve in the cleaning water RW.
  • the slurry S formed in the mixing device 2 is circulated intensively in order to ensure turbulence which supports the detachment of the inorganic binder and the other impurities. If necessary, heat is supplied to bring the slurry S to a process temperature that is in the optimal range of 80-100 ° C. Excess cleaning water RWK contaminated with inorganic binder residues and other soiling, such as molding material additives and combustion residues, is discharged from the mixing device 2.
  • the mixing of the cleaning water RW with the foundry sand mixture G is so intensive that in particular the inorganic binder dissolves essentially completely in the cleaning water RW within a short time.
  • the combustion residues and any additive residues present are absorbed by the cleaning water RW from the foundry sand mixture G.
  • the dwell times provided for this purpose for the slurry S in the mixing device 2 are 5 to 60 minutes.
  • the slurry S passes from the mixing device 2 into a rinsing device 3, in which it is rinsed with cleaning water RW in order to rinse off the inorganic binder residues and other impurities dissolved in the slurry S from the molding sand grains from the molding sand grains F of the slurry S.
  • the rinsing device 3 can be designed as a conventional sieve machine, in which the slurry S is placed on a sieve and sprayed with cleaning water RW that is discharged by means of nozzles arranged above the sieve.
  • the resulting cleaning water RWK which is contaminated with inorganic binder residues and other contaminants, is collected and fed to a pre-cleaning device 4 in which the insoluble inorganic binder residues are separated from the contaminated cleaning water RWK.
  • the excess contaminated cleaning water RWK diverted from the mixing device 2 is also fed to the pre-cleaning device 4.
  • a partial flow RWKV 'of the pre-cleaned contaminated cleaning water RWK can be reused in that it is fed to the mixing device 2 as cleaning water RW.
  • the total volume flow of the cleaning water RW supplied to the mixing device 2 can be composed of a partial flow of fresh cleaning water RWF and the partial flow RWKV 'of the pre-cleaned cleaning water RWV.
  • Another partial flow RWKV "of the pre-cleaned contaminated cleaning water RWK for rinsing the slurry S can be fed to the flushing device 3.
  • the total volume flow of the cleaning water RW fed to the flushing device 3 can be made up of a partial flow of fresh cleaning water RWF and the partial flow RWKV 'of the pre-cleaned Cleaning water RWV and a further partial flow RWK 'of contaminated cleaning water RWK, which comes from one or more of the process steps explained below.
  • Contaminated cleaning water RWKE which is so heavily soiled that it can no longer take on a cleaning function, is diverted from the process and fed to a separate treatment.
  • the molding sand F separated from the slurry S in the rinsing device 3 is to be used for the production of molding material which comprises an organic binder
  • the molding sand F passes through a treatment device 5 in which it is wetted with an acidic neutralizing solution NL to reduce its pH -Value to be set to an optimal value of 7 - 8 for this purpose.
  • the molding sand F adjusted in this way with regard to its pH value is rinsed in a rinsing device 6 with fresh cleaning water RWF in order to remove excess neutralizing solution NL.
  • the resulting RWN cleaning water which is contaminated with neutralizing solution, is collected and disposed of.
  • the setting of the pH value in the treatment device 5 and the subsequent rinsing in the rinsing device 6 can be skipped if the molding sand F is intended exclusively for the production of molding material which comprises an inorganic binder.
  • the molding sand F still loaded with cleaning water RW is transported to a dewatering device 7 after rinsing in the rinsing device 3 or the optionally run through stations "treatment device 5 and rinsing device 6", in which dewatering is carried out by mechanical means.
  • the dewatering machine 7 can be designed as a screening machine known for these purposes in the prior art, as a vacuum belt dryer or as a press.
  • the mechanical dewatering reduces the moisture in the molding sand F to such an extent that significantly less energy is required to achieve the required degree of drying during the subsequent thermal drying.
  • the contaminated cleaning water RWK resulting from the mechanical dewatering is fed to the rinsing device 3, for example, as a further partial flow of the cleaning water RW fed in there.
  • the mechanically dewatered molding sand F is fed to a drying device 8, which can be a rotary kiln, a belt dryer or the like.
  • the temperature Tw at which the thermal drying takes place is set to> 500-700 ° C., so that the temperature at which the Burn the corresponding portion of the molding sand F still adhering organic binder residues.
  • the thermal drying can be carried out at temperatures in the range of 100-300 ° C.
  • the water vapor produced during thermal drying is captured, condensed and fed into the process as fresh RWF cleaning water.
  • the fresh cleaning water RWF obtained during the thermal drying also forms, for example, a partial flow of the cleaning water RW fed into the rinsing device 3.
  • the molding sand F passes through a dedusting device 9 in which fine dust FS present in the molding sand F is separated from the remaining grains of the molding sand F.
  • the fine dust FS can no longer be used for casting purposes and is therefore disposed of in the usual way or put to another use.
  • the dedusting device 9 is based, for example, on the principle of current classification, in which air is used as the separating medium (so-called “air sifting”). The air used here can be reused or released into the environment.
  • the dust-free molding sand F finally arrives in a classification device 10 in which the molding sand F corresponds to at least two classes of molding sand is divided into at least two molding sand sub-quantities Fk, Fm, of which one molding sand sub-quantity Fk comprises the part of the molding sand F whose grains do not exceed a certain limit size, while the other molding sand sub-quantity Fm contains the part of the molding sand F whose grains have a size that is at least equal to this limit value.
  • the classification step can also be carried out in combination with the dedusting.
  • Fluid basins are usually used for this, in which the molding sand F is fed in from above, air flows through a sintered plate attached to the bottom and is set in vibration with the aid of unbalanced motors. At the same time, the fine dust FS is transported away by means of the air via a suction device.
  • the grain classes are drawn off at opposite ends of the tank. The finer parts rise higher and have to overcome a barrier. The gross proportions do not rise that high and are therefore deducted under a barrier.
  • Cores or molded parts for casting molds can be produced in a conventional manner from the molding materials FA, FO.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (15)

  1. Procédé de récupération de sable de moulage (F) à partir d'un mélange de sable de fonderie (G) qui comporte au moins une proportion (FAB) de fragments de matériau de moulage ou des granulés de matériau de moulage en vrac se produisant lors du démoulage d'une pièce moulée hors du moule de coulage à la suite de la destruction des noyaux de coulée ou des parties de moulage formant la pièce moulée, lesquels sont formés à partir du sable de moulage (F) ainsi que d'un liant inorganique et éventuellement d'un ou plusieurs additifs pour ajuster les propriétés du matériau de moulage, le procédé comportant les étapes de travail suivantes :
    a) mélanger le mélange de sable de fonderie (G) avec de l'eau de nettoyage (RW) pour former une boue (S) afin de dissoudre les résidus de liant inorganique (AB), contenus dans le mélange de sable de fonderie (G), ainsi que les additifs éventuellement présents dans le sable de moulage (F) et de les rincer hors du mélange de sable de fonderie (G),
    et
    b) séparer l'eau de nettoyage (RWK) contaminée par les résidus de liants inorganiques du sable de moulage (F) contenu dans la boue (S),
    caractérisé en ce que la température de procédé de la boue (S) formée par l'eau de nettoyage et le mélange de sable de fonderie (G) (étape de travail a)) est de 50 - 200 °C.
  2. Procédé selon la revendication 1, caractérisé en ce que la température de procédé de la boue (S) est de 70 - 120 °C.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que les fragments de matériau de moulage contenus dans le mélange de sable de fonderie (G) sont granulés mécaniquement avant d'être mélangés avec l'eau de nettoyage (étape de travail a)).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le mélange de sable de fonderie (G) passe, avant l'étape de travail a), dans un échangeur de chaleur, à travers lequel est dirigée de l'eau de nettoyage (RWK), encore chaude, contaminée et séparée, dans l'étape de travail b), du sable de moulage (F) afin de préchauffer le mélange de sable de fonderie (G).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'eau de nettoyage (RWK) contaminée séparée, dans l'étape de travail b), du sable de moulage (F) passe dans échangeur de chaleur dans lequel est réchauffée l'eau de nettoyage (RW) affluente pour l'étape de travail a).
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'eau de nettoyage (RWK) contaminée récupérée dans l'étape de travail b) est réutilisée au moins une fois pour l'étape de travail a).
  7. Procédé selon la revendication 6, caractérisé en ce que la réutilisation est répétée jusqu'à atteindre la solubilité du liant dans l'eau ou jusqu'à ce que la proportion de matière en suspension contenue dans l'eau prédomine.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le pH du sable de moulage (F) obtenu dans l'étape de travail b) est réglé sur un pH de 5 - 9 par rinçage ou mouillage avec une solution neutralisante (NL).
  9. Procédé selon la revendication 8, caractérisé en ce qu'un acide dilué est utilisé en tant que solution neutralisante (NL).
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que le sable de moulage (F) obtenu dans l'étape de travail b) est déshydraté mécaniquement.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que le sable de moulage (F) obtenu dans l'étape de travail b) est séché à une température de séchage de 80 - 800 °C.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que le mélange de sable de fonderie (G) contient une proportion (FOB) de fragments ou de granulats de noyaux de moulage ou de parties de moulage formés à partir d'un matériau de moulage qui a été formé à partir du sable de moulage (F) ainsi que d'un liant organique et éventuellement à partir d'un ou plusieurs additifs pour ajuster les propriétés du matériau de moulage.
  13. Procédé selon la revendication 12, caractérisé en ce que le sable de moulage (F) obtenu dans l'étape de travail b) est chauffé à une température étant au moins de 500 °C afin de brûler des résidus de liant organique adhérant sur le sable de moulage (F).
  14. Procédé selon l'une des revendications 11 et 13, caractérisé en ce que la combustion des résidus de liant organique a lieu pendant le séchage du sable de moulage (F).
  15. Procédé selon l'une des revendications précédentes, caractérisé en ce que le sable de moulage obtenu dans l'étape de travail b) est soumis à une classification.
EP18180868.4A 2018-06-29 2018-06-29 Procédé de préparation d'un mélange de sable de fonderie Active EP3586995B2 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
ES18180868T ES2874204T5 (es) 2018-06-29 2018-06-29 Procedimiento para la preparación de una mezcla de arena de fundición
PL18180868.4T PL3586995T5 (pl) 2018-06-29 2018-06-29 Sposób przerobu mieszaniny masy formierskiej
EP18180868.4A EP3586995B2 (fr) 2018-06-29 2018-06-29 Procédé de préparation d'un mélange de sable de fonderie
HUE18180868A HUE054926T2 (hu) 2018-06-29 2018-06-29 Eljárás öntödei homokkeverék elõállítására
US17/256,280 US11707777B2 (en) 2018-06-29 2019-07-01 Method for preparing a foundry sand mixture
MX2020014218A MX2020014218A (es) 2018-06-29 2019-07-01 Procedimiento para tratar una mezcla de arena de fundición.
BR112020026856-9A BR112020026856B1 (pt) 2018-06-29 2019-07-01 Processo para a recuperação de areia de moldagem
JP2020572871A JP2021529667A (ja) 2018-06-29 2019-07-01 鋳物砂混合物の処理方法
KR1020207036136A KR20210010908A (ko) 2018-06-29 2019-07-01 주물사 혼합물 처리 방법
PCT/IB2019/055584 WO2020003277A1 (fr) 2018-06-29 2019-07-01 Procédé de préparation d'un mélange de sable de fonderie
CN201980043992.7A CN112512723A (zh) 2018-06-29 2019-07-01 铸造用砂混合物的处理方法

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Application Number Priority Date Filing Date Title
EP18180868.4A EP3586995B2 (fr) 2018-06-29 2018-06-29 Procédé de préparation d'un mélange de sable de fonderie

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EP3586995A1 EP3586995A1 (fr) 2020-01-01
EP3586995B1 true EP3586995B1 (fr) 2021-04-14
EP3586995B2 EP3586995B2 (fr) 2024-04-24

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US (1) US11707777B2 (fr)
EP (1) EP3586995B2 (fr)
JP (1) JP2021529667A (fr)
KR (1) KR20210010908A (fr)
CN (1) CN112512723A (fr)
BR (1) BR112020026856B1 (fr)
ES (1) ES2874204T5 (fr)
HU (1) HUE054926T2 (fr)
MX (1) MX2020014218A (fr)
PL (1) PL3586995T5 (fr)
WO (1) WO2020003277A1 (fr)

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CN116393655A (zh) * 2023-06-06 2023-07-07 河北光德精密机械股份有限公司 一种速溶型芯及其制备方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003462A1 (fr) 1984-02-02 1985-08-15 Giesserei-Technik H.-G. Lorek Vdg Procede et installation pour eliminer les restes de liants organiques et inorganiques provenant de sable de fonderie
DE4109167A1 (de) 1990-03-20 1991-09-26 Kuettner Gmbh & Co Kg Dr Verfahren zum aufbereiten von (giesserei-)altsand
JP2002178100A (ja) 2000-12-15 2002-06-25 Toyohashi University Of Technology 回収鋳物砂の再生方法
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US11707777B2 (en) 2023-07-25
KR20210010908A (ko) 2021-01-28
JP2021529667A (ja) 2021-11-04
ES2874204T5 (es) 2024-10-07
MX2020014218A (es) 2021-05-27
EP3586995A1 (fr) 2020-01-01
BR112020026856A2 (pt) 2021-04-06
BR112020026856B1 (pt) 2024-03-12
EP3586995B2 (fr) 2024-04-24
ES2874204T3 (es) 2021-11-04
CN112512723A (zh) 2021-03-16
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