CA2022769A1 - Method of reconditioning foundry sand - Google Patents
Method of reconditioning foundry sandInfo
- Publication number
- CA2022769A1 CA2022769A1 CA002022769A CA2022769A CA2022769A1 CA 2022769 A1 CA2022769 A1 CA 2022769A1 CA 002022769 A CA002022769 A CA 002022769A CA 2022769 A CA2022769 A CA 2022769A CA 2022769 A1 CA2022769 A1 CA 2022769A1
- Authority
- CA
- Canada
- Prior art keywords
- sand
- neutralization
- regeneration
- value
- per
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004576 sand Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 230000008929 regeneration Effects 0.000 claims abstract description 17
- 238000011069 regeneration method Methods 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 7
- 238000013208 measuring procedure Methods 0.000 claims abstract description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000746 purification Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims 3
- 235000011149 sulphuric acid Nutrition 0.000 claims 3
- 239000001117 sulphuric acid Substances 0.000 claims 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims 2
- 239000002585 base Substances 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 55
- 239000010802 sludge Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000000440 bentonite Substances 0.000 description 4
- 229910000278 bentonite Inorganic materials 0.000 description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 229910017974 NH40H Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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
- B22C5/18—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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
A B S T R A C T
The invention relates to a process for reconditioning mono or mixed foundry sand containing organic and/or inorganic binders, where the sand containing organic binder after a thermal regeneration or the sand containing inorganic binder after a thermal and mechanical regeneration is neutralized with a suitable base or acid depending on its pH-value determined after regeneration by a measuring procedure, so that it subsequently has a pH-value between 6 and 8.
The invention relates to a process for reconditioning mono or mixed foundry sand containing organic and/or inorganic binders, where the sand containing organic binder after a thermal regeneration or the sand containing inorganic binder after a thermal and mechanical regeneration is neutralized with a suitable base or acid depending on its pH-value determined after regeneration by a measuring procedure, so that it subsequently has a pH-value between 6 and 8.
Description
20227~9 ~ 1-.
Method of reconditioning foundry sand .
S .
.;:
10 The invention relates to a method for reconditioning foundry sand.
The wet, mechanical, thermal or combined regeneration of foundry sand such as quartz sand, olivine, zircon, chromite sand and the like having organic or inorganic binders is known. The goal of such regeneration processes is to 15 provide a reconditioned sand which can be re-used instead of or as new sand. At the same time, substances in the foundry sand hazardous to the environement are to be elirninated by regeneration. Sand bound organically - usually only needs to be regenerated thermally, if it does not contain basic, acidic or other disturbing components, which do not combust or vaporize.
Mono-sand or mixed sand bound inorganically, in particular sand originally ;
treated with bentonite must be thermally and mechanically regenerated to produce a~sand which can be re-used. ;
A disadvantage of these known methods, for example for organic binder `
systems ~ with ~basic or acidic components which are difficult or impossible to eliminate and in particular ` for mono-sand or rnixed sand with inorganic bindersj is that the regenerate sand has properties which deviate from new `;; ~ -sand, for example the pH-value,~ the electrical conductivity, the degree of ~;~; 30 o~iithization, the sludge content and ~ the like. The properties of such re- ;~ ~ -; `gènerate `sand ~ are ~more ,or~ ~less ~disadvantageous especially !for reuse in making~ cores. The poorer properties of such regenerate sand apply particu-larly in it~ use ~as core sand with~ a synthetic resin binder and cause reduced rigidity, reduced processing time of the sand mixtures, increased consumption 35 ~ of binder and the like.
:
The object of the present invention is to provide a process of the above 20227~9 . 2 ~
described type, with which thermally and/or mechanically regenerated sand can be treated so that subsequently it is like new sand or similar to it.
This object is solved according to the invention in that sand containing an S organic binder after thermal regeneration or sand containing inorganic binder after a thermal and mechanical regeneration is neutralized with a suited base or acid depending on its pH-value determined after regeneration by a measuring procedure, for example by titration, so that subsequently it has a pH-value between 6 and 8.
Further embodiments of the process are given in the subclaims.
The essence of the invention is then to additionally wet-neutralize and purify the sand grains such as quartz grains for example originally treated with organic and/or inorganic binders (bentonite) after a thermal treatment and a subsequent mechanical purification, in particular to bring its pH-value and its electrical conductivity to the corresponding values of new sand.
The organic binder is extensively combusted or the inorganic binder, for example clay or bentonite, is dead-burned by the thermal and mechanical treatment and substantially extracted and separated from the sand grains by the mechanical purification. According to the invention, the regenerate sand is subsequently neutralized in the wet state in containers and purified. The mi~ture is stirred or turned in the treatment vessel to support and accele-rate the process.
The necessary amounts of neutralization additives can be advantageously deterrnined by titration of 50 to 100 g of a sand sample, namely when the sand is in its thermal or possibly its mechanical regeneration state.
~ , ! i ,! ~ , Experiments have shown surprisingly that a certain turbidity of the aqueous solution arises when adding a suitable acid as the neutralizer to regenerate `~
sand which was bound inorganically. Apparently a slight separation of dirt or sludge or binder still adhearing to the sand grains is caused by the neutra-lization Thus a possible electrostatic binding and adhesion of the grains is also eliminated.
,:
Method of reconditioning foundry sand .
S .
.;:
10 The invention relates to a method for reconditioning foundry sand.
The wet, mechanical, thermal or combined regeneration of foundry sand such as quartz sand, olivine, zircon, chromite sand and the like having organic or inorganic binders is known. The goal of such regeneration processes is to 15 provide a reconditioned sand which can be re-used instead of or as new sand. At the same time, substances in the foundry sand hazardous to the environement are to be elirninated by regeneration. Sand bound organically - usually only needs to be regenerated thermally, if it does not contain basic, acidic or other disturbing components, which do not combust or vaporize.
Mono-sand or mixed sand bound inorganically, in particular sand originally ;
treated with bentonite must be thermally and mechanically regenerated to produce a~sand which can be re-used. ;
A disadvantage of these known methods, for example for organic binder `
systems ~ with ~basic or acidic components which are difficult or impossible to eliminate and in particular ` for mono-sand or rnixed sand with inorganic bindersj is that the regenerate sand has properties which deviate from new `;; ~ -sand, for example the pH-value,~ the electrical conductivity, the degree of ~;~; 30 o~iithization, the sludge content and ~ the like. The properties of such re- ;~ ~ -; `gènerate `sand ~ are ~more ,or~ ~less ~disadvantageous especially !for reuse in making~ cores. The poorer properties of such regenerate sand apply particu-larly in it~ use ~as core sand with~ a synthetic resin binder and cause reduced rigidity, reduced processing time of the sand mixtures, increased consumption 35 ~ of binder and the like.
:
The object of the present invention is to provide a process of the above 20227~9 . 2 ~
described type, with which thermally and/or mechanically regenerated sand can be treated so that subsequently it is like new sand or similar to it.
This object is solved according to the invention in that sand containing an S organic binder after thermal regeneration or sand containing inorganic binder after a thermal and mechanical regeneration is neutralized with a suited base or acid depending on its pH-value determined after regeneration by a measuring procedure, for example by titration, so that subsequently it has a pH-value between 6 and 8.
Further embodiments of the process are given in the subclaims.
The essence of the invention is then to additionally wet-neutralize and purify the sand grains such as quartz grains for example originally treated with organic and/or inorganic binders (bentonite) after a thermal treatment and a subsequent mechanical purification, in particular to bring its pH-value and its electrical conductivity to the corresponding values of new sand.
The organic binder is extensively combusted or the inorganic binder, for example clay or bentonite, is dead-burned by the thermal and mechanical treatment and substantially extracted and separated from the sand grains by the mechanical purification. According to the invention, the regenerate sand is subsequently neutralized in the wet state in containers and purified. The mi~ture is stirred or turned in the treatment vessel to support and accele-rate the process.
The necessary amounts of neutralization additives can be advantageously deterrnined by titration of 50 to 100 g of a sand sample, namely when the sand is in its thermal or possibly its mechanical regeneration state.
~ , ! i ,! ~ , Experiments have shown surprisingly that a certain turbidity of the aqueous solution arises when adding a suitable acid as the neutralizer to regenerate `~
sand which was bound inorganically. Apparently a slight separation of dirt or sludge or binder still adhearing to the sand grains is caused by the neutra-lization Thus a possible electrostatic binding and adhesion of the grains is also eliminated.
,:
2~22~9 - 3 -After the neutralization and optionally a washing and subsequent drying, the treated sand when observed under the m~croscope already has a clearly cleaner appearance than before and has properties which are the same or S similar to new sand as is shown in the following examples I and II.
Example I
Quartz sand regenerate: AFS 60.3 Proper~,r Initial Neutral~zation with Comparable new sand regenerate 10 ml conc.
sand H2S04 per kg . . :
pH-value 9.6 7.4 ca. 7.0 Electrical sonductivity in ,uS/cm 172 4 ca. 0 Red heat loss (%) 0.17 0.14 ca. 0 Sludge content ~o 1.04 0.34 ca. 0.3 De~ree of oollthization 0.93 0.79 ca. 0 .
Example Il ~ ~
Quartz sand regenerate: AFS 45 ~ -:: :
1 ~oper~r Initial Neutralization with 12 ml ~- - -regenerate sand NH40H (25 ~o) per kg sand ~ ~
~ ~ .
pH-valué 3.6 ` 7.2 ;`
Electrical conductivity in ,uS/cm 189 12 `: . ',` '~
2 ~2 27 ~ 9 4 A neutralization of regenerated sand is illustrated in the attached drawing.
The sand already regenerated is fed to a neutralization vessel 3 from a sand supply 1 over a belt weigher for adjusting the weight per charge. ~long with 5 the supply of sand, a neutralization solution is pumped out of a storage container 4 by a pump 5 into the neutralization vessel 3 which is controlled by a fill level display (not shown). A stirring or turning of the material takes place in the vessel 3 by schematically illustrated stirring means during the filling process and during neutralization. After neutralization, the 10 solution is drawn through a filter plate 6, a pump 7 and a filter 8 and fed back to the storage container 4. A refreshing of the used neutralization solution with wash or fresh water and the addition of new acid or base takes place by means of a container 16. After neutralization, a washing and purification of the neutralized regenerate takes place by introducing a 15 washing solution from the storage container 13 into the vessel 3 when the stirring process is continued. The sand-wash water mL~Lture is then pumped out of the vessel 3 by a pump 9 into a cyclone 10. The sand and sludge-con-taining water separate in the cyclone 10. The sludge water is purified in a filter 12 and fed back to the storage container 13 by a pump 11. Fresh 20 water is added here to the used washing water. The separated, purified and neutralized sand from the cyclone 10 is dried by means of a swing drier 14 and then transported to a storage bunker 15.
The neutralization and washing or purification take place alternatively in two 25 respectively closed circulation systems. To adjust the neutrality of the washing solution, bases can also be added for example when neutralizing with an acid or also vice versa. The belt weigher can also fill several neutrali~
zation vessels by means of a distributor belt, where also several cyclons can be employed-The neutralization and purification processes are performed in closed cycleswith the least possible amount of water consumption for environmental reasons. The neutralization solution after the completed reaction is drawn out of the vessel together with the extracted sludge fraction and subse-35 quently passed through a filter to separate the sludge material. When neces-sary, the filtered and used neutralization solution is refreshed with new ;, ~. ,~
2~227~9 5-acid or base and with fresh water or wash water and is always fed back in the cyclic process for the next treatment, for example by means of an inter-mediate container.
S A further exarnple is shown in the following of a mixed sand bound inor-ganically, where the initial old sand is thermally and mechanically prepared to give regenerate sand and it is subsequently neutralized and purified.
A strength test is made on particularly sensitive cold-box core sand mixtures 10 at various stages of treatment compared to new sand.
~ 2022759 Example III
Mesh Bentonite Therm.-mech. regen. Neutral. with 10 ml conc.
analysis old sand sand from I H2S04 per kg sand from I
s II III
_ _ % % %
0.71 mm 0.2 0 0.1 0.5 mm 0.5 0.7 0-9 0.355 mm 3.6 6.1 5.7 0.25 rnm 25.1 22.3 21~5 0.18 mm 52.B 48.0 50.2 0.125 mm 14.2 21.0 20.0 0.09 mm 3.3 1.8 1.5 0.063 mm 0.3 0.1 0.1 -0.02 rnm 0 0 0 20.02 mm 0 0 0 -pH-value 9.8 9.7 7.1 ~ -Electr. con- -ductivity in,uS/cm 976 165 3 -~
Sludge % 8.26 0.93 0.32 ~ ;-Red heat ~ ~
loss % 2.57 0.17 0.14 ~ ~;
Oolith. degree 2.3 0.89 0.77 Comparison of flexural strength inl N~cm~ on cold-box sand samples~
` ` sand mixture: 30 ~o new sand, AFS about 60 70 ~o therm.-mech. regenerate 35 0.8 % synthetic resin 352 T 14 0.8 % synthetic resin 652 TEA 700 ~` 2~22769 7-Test time Sand IISalld III 100 new sand S :
1/2 h lgS 390 340 h 190 420 410 2 h 192 440 420 ~ ~ -24 h 225 450 460 ~ ~
; ~:
-.
.
Example I
Quartz sand regenerate: AFS 60.3 Proper~,r Initial Neutral~zation with Comparable new sand regenerate 10 ml conc.
sand H2S04 per kg . . :
pH-value 9.6 7.4 ca. 7.0 Electrical sonductivity in ,uS/cm 172 4 ca. 0 Red heat loss (%) 0.17 0.14 ca. 0 Sludge content ~o 1.04 0.34 ca. 0.3 De~ree of oollthization 0.93 0.79 ca. 0 .
Example Il ~ ~
Quartz sand regenerate: AFS 45 ~ -:: :
1 ~oper~r Initial Neutralization with 12 ml ~- - -regenerate sand NH40H (25 ~o) per kg sand ~ ~
~ ~ .
pH-valué 3.6 ` 7.2 ;`
Electrical conductivity in ,uS/cm 189 12 `: . ',` '~
2 ~2 27 ~ 9 4 A neutralization of regenerated sand is illustrated in the attached drawing.
The sand already regenerated is fed to a neutralization vessel 3 from a sand supply 1 over a belt weigher for adjusting the weight per charge. ~long with 5 the supply of sand, a neutralization solution is pumped out of a storage container 4 by a pump 5 into the neutralization vessel 3 which is controlled by a fill level display (not shown). A stirring or turning of the material takes place in the vessel 3 by schematically illustrated stirring means during the filling process and during neutralization. After neutralization, the 10 solution is drawn through a filter plate 6, a pump 7 and a filter 8 and fed back to the storage container 4. A refreshing of the used neutralization solution with wash or fresh water and the addition of new acid or base takes place by means of a container 16. After neutralization, a washing and purification of the neutralized regenerate takes place by introducing a 15 washing solution from the storage container 13 into the vessel 3 when the stirring process is continued. The sand-wash water mL~Lture is then pumped out of the vessel 3 by a pump 9 into a cyclone 10. The sand and sludge-con-taining water separate in the cyclone 10. The sludge water is purified in a filter 12 and fed back to the storage container 13 by a pump 11. Fresh 20 water is added here to the used washing water. The separated, purified and neutralized sand from the cyclone 10 is dried by means of a swing drier 14 and then transported to a storage bunker 15.
The neutralization and washing or purification take place alternatively in two 25 respectively closed circulation systems. To adjust the neutrality of the washing solution, bases can also be added for example when neutralizing with an acid or also vice versa. The belt weigher can also fill several neutrali~
zation vessels by means of a distributor belt, where also several cyclons can be employed-The neutralization and purification processes are performed in closed cycleswith the least possible amount of water consumption for environmental reasons. The neutralization solution after the completed reaction is drawn out of the vessel together with the extracted sludge fraction and subse-35 quently passed through a filter to separate the sludge material. When neces-sary, the filtered and used neutralization solution is refreshed with new ;, ~. ,~
2~227~9 5-acid or base and with fresh water or wash water and is always fed back in the cyclic process for the next treatment, for example by means of an inter-mediate container.
S A further exarnple is shown in the following of a mixed sand bound inor-ganically, where the initial old sand is thermally and mechanically prepared to give regenerate sand and it is subsequently neutralized and purified.
A strength test is made on particularly sensitive cold-box core sand mixtures 10 at various stages of treatment compared to new sand.
~ 2022759 Example III
Mesh Bentonite Therm.-mech. regen. Neutral. with 10 ml conc.
analysis old sand sand from I H2S04 per kg sand from I
s II III
_ _ % % %
0.71 mm 0.2 0 0.1 0.5 mm 0.5 0.7 0-9 0.355 mm 3.6 6.1 5.7 0.25 rnm 25.1 22.3 21~5 0.18 mm 52.B 48.0 50.2 0.125 mm 14.2 21.0 20.0 0.09 mm 3.3 1.8 1.5 0.063 mm 0.3 0.1 0.1 -0.02 rnm 0 0 0 20.02 mm 0 0 0 -pH-value 9.8 9.7 7.1 ~ -Electr. con- -ductivity in,uS/cm 976 165 3 -~
Sludge % 8.26 0.93 0.32 ~ ;-Red heat ~ ~
loss % 2.57 0.17 0.14 ~ ~;
Oolith. degree 2.3 0.89 0.77 Comparison of flexural strength inl N~cm~ on cold-box sand samples~
` ` sand mixture: 30 ~o new sand, AFS about 60 70 ~o therm.-mech. regenerate 35 0.8 % synthetic resin 352 T 14 0.8 % synthetic resin 652 TEA 700 ~` 2~22769 7-Test time Sand IISalld III 100 new sand S :
1/2 h lgS 390 340 h 190 420 410 2 h 192 440 420 ~ ~ -24 h 225 450 460 ~ ~
; ~:
-.
.
Claims (11)
1. Process for reconditioning mono or mixed foundry sand containing organic and/or inorganic binders, c h a r a c t e r i z e d i n t h a t the sand containing organic binder after a thermal regeneration or the sand containing inorganic binder after a thermal and mechanical regene-ration is neutralized with a suitable base or acid depending on its pH-value determined after regeneration by a measuring procedure, so that said sand subsequently has a pH-value between 6 and 8.
2. Process of claim 1, characterized in that the pH-value of the sand lies between 6.8 and 7.5 after neutralization.
3. Process of claim 1, characterized in that the sand is subjected to wet purification and subsequent drying after neutralization.
4. Process of claim 1, characterized in that for neutralization NH4OH is used as the base or sulphuric acid or hydrofluoric acid is used.
5. Process of claim 1, characterized in that for neutralization concentrated sulphuric acid in an amount of 3 to 50 ml per kg sand is added to the sand which is basic after regeneration.
6. Process of claim 1, characterized in that for neutralization concentrated sulphuric acid in an amount of 8 to 12 ml per kg sand is added to the sand which is basic after regeneration.
7. Process of claim 1, characterized in that for neutralization 3 to 40 ml of 25 % NH4OH per kg sand is added to the sand which is acidic after regeneration.
8. Process of claim 1, characterized in that for neutralization 12 ml of 25 % NH4OH per kg sand is added to the sand which is acidic after rege-neration.
9. Process of claim 1, characterized in that the neutralization and purifi-cation are performed in a closed circulation system and alternatively in a single vessel.
10. Process of claims 1 or 6, characterized in that the neutralizing solution after use is purified by filtration and used again in the neutralization process after being refreshed with washing water.
11. Reconditioned foundry sand obtainable in that it is treated thermally and/or mechanically depending on the binder contained therein and thereafter neutralized so that its pH-value lies between 6.8 and 7.5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4004553A DE4004553C1 (en) | 1990-02-14 | 1990-02-14 | |
| DEP4004553.6 | 1990-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2022769A1 true CA2022769A1 (en) | 1991-08-15 |
Family
ID=6400137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002022769A Abandoned CA2022769A1 (en) | 1990-02-14 | 1990-08-07 | Method of reconditioning foundry sand |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP0446402A1 (en) |
| JP (1) | JPH03238141A (en) |
| KR (1) | KR910015345A (en) |
| CN (1) | CN1054021A (en) |
| BR (1) | BR9003152A (en) |
| CA (1) | CA2022769A1 (en) |
| CS (1) | CS219190A2 (en) |
| DD (1) | DD297087A5 (en) |
| DE (1) | DE4004553C1 (en) |
| DK (1) | DK149890A (en) |
| FI (1) | FI902822A7 (en) |
| HU (1) | HUT58008A (en) |
| NO (1) | NO902410L (en) |
| PL (1) | PL285083A1 (en) |
| PT (1) | PT94164A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4129863A1 (en) * | 1991-09-07 | 1993-03-11 | Hanf Carl Elino Ind Ofenbau | Bentonite bound foundry moulding sand conditioning process - by heat treatment of precleaned sand for high quality sand useful for core prodn. |
| DE19927107A1 (en) * | 1999-06-14 | 2000-12-21 | Fischer Georg Gmbh & Co Kg | Device to reduce odorous emissions from a casting installation has a container for bio catalysts and/or enzymes and active region in which the bio catalysts and/or the enzymes interact with the substances causing the odorous emissions |
| EP1222978A3 (en) * | 2001-01-15 | 2007-10-17 | Sintokogio, Ltd. | A method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite |
| DE102007027298A1 (en) * | 2007-06-11 | 2008-12-18 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Process for the treatment of foundry sand |
| CN102059319B (en) * | 2011-01-19 | 2012-12-19 | 昆明理工大学 | Joint regeneration method for old resin sand |
| CN102500458B (en) * | 2011-11-28 | 2014-07-09 | 河海大学 | Sand washing method and special device thereof |
| CN102615243B (en) * | 2012-03-27 | 2013-09-18 | 华中科技大学 | Foundry used sand wet intermittent regeneration method and equipment thereof |
| JP2016147287A (en) * | 2015-02-12 | 2016-08-18 | マツダ株式会社 | Casting sand regeneration process, and polishing device |
| ES2874204T5 (en) * | 2018-06-29 | 2024-10-07 | Nemak Sab De Cv | Procedure for preparing a foundry sand mixture |
| JP7142563B2 (en) * | 2018-12-26 | 2022-09-27 | 伊藤忠セラテック株式会社 | How to recycle recovered sand |
| EP3797896A1 (en) * | 2019-09-27 | 2021-03-31 | Finn Recycling OY | Cleaning sand used at foundry |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US414388A (en) * | 1889-11-05 | emmens | ||
| DE2233111C3 (en) * | 1972-07-06 | 1974-11-28 | Hermann 2105 Seevetal Jacob | Method and device for the regeneration of synthetic resin-bonded foundry sand |
| US4113510A (en) * | 1974-06-07 | 1978-09-12 | Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. | Process for regenerating foundry sand |
| CA1050209A (en) * | 1974-12-16 | 1979-03-13 | Julius M. Bleuenstein | Sand reclamation and purification |
| JPS5292823A (en) * | 1976-02-02 | 1977-08-04 | Hitachi Ltd | Old sand cleaning reproduction process |
| DE2656672C2 (en) * | 1976-12-15 | 1978-09-21 | Daimler-Benz Ag, 7000 Stuttgart | Procedure for regenerating core sand |
| CH631643A5 (en) * | 1978-04-14 | 1982-08-31 | Fischer Ag Georg | METHOD FOR REGENERATING OLD FOUNDRY SAND AND DEVICE FOR CARRYING OUT THE METHOD AND PRODUCT OF THE METHOD. |
| US4401638A (en) * | 1981-12-21 | 1983-08-30 | Materias Primas, Monterrey, S.A. | Process for purifying silica sand |
| GB8317669D0 (en) * | 1983-06-29 | 1983-08-03 | British Ind Sand Ltd | Chemical treatment of sand |
| US4685973A (en) * | 1984-02-03 | 1987-08-11 | Steel Castings Research And Trade Association | Reclamation of foundry sands |
-
1990
- 1990-02-14 DE DE4004553A patent/DE4004553C1/de not_active Expired - Lifetime
- 1990-04-26 EP EP19900107984 patent/EP0446402A1/en not_active Withdrawn
- 1990-05-03 CS CS902191A patent/CS219190A2/en unknown
- 1990-05-07 PL PL28508390A patent/PL285083A1/en unknown
- 1990-05-16 JP JP2126543A patent/JPH03238141A/en active Pending
- 1990-05-25 PT PT94164A patent/PT94164A/en not_active Application Discontinuation
- 1990-05-31 NO NO90902410A patent/NO902410L/en unknown
- 1990-06-06 FI FI902822A patent/FI902822A7/en not_active Application Discontinuation
- 1990-06-12 HU HU903815A patent/HUT58008A/en unknown
- 1990-06-19 DK DK149890A patent/DK149890A/en not_active IP Right Cessation
- 1990-06-27 KR KR1019900009544A patent/KR910015345A/en not_active Ceased
- 1990-06-28 BR BR909003152A patent/BR9003152A/en unknown
- 1990-07-05 CN CN90103344A patent/CN1054021A/en active Pending
- 1990-08-07 CA CA002022769A patent/CA2022769A1/en not_active Abandoned
- 1990-08-15 DD DD90343469A patent/DD297087A5/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI902822A0 (en) | 1990-06-06 |
| PT94164A (en) | 1991-09-30 |
| DE4004553C1 (en) | 1991-10-10 |
| DK149890A (en) | 1991-08-15 |
| HU903815D0 (en) | 1990-11-28 |
| CS219190A2 (en) | 1991-09-15 |
| CN1054021A (en) | 1991-08-28 |
| DD297087A5 (en) | 1992-01-02 |
| HUT58008A (en) | 1992-01-28 |
| KR910015345A (en) | 1991-09-30 |
| JPH03238141A (en) | 1991-10-23 |
| PL285083A1 (en) | 1991-10-07 |
| BR9003152A (en) | 1991-11-12 |
| EP0446402A1 (en) | 1991-09-18 |
| NO902410D0 (en) | 1990-05-31 |
| DK149890D0 (en) | 1990-06-19 |
| FI902822L (en) | 1991-08-15 |
| NO902410L (en) | 1991-08-15 |
| FI902822A7 (en) | 1991-08-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |