US2783511A - Method for reclaiming used foundry sand - Google Patents
Method for reclaiming used foundry sand Download PDFInfo
- Publication number
- US2783511A US2783511A US407446A US40744654A US2783511A US 2783511 A US2783511 A US 2783511A US 407446 A US407446 A US 407446A US 40744654 A US40744654 A US 40744654A US 2783511 A US2783511 A US 2783511A
- Authority
- US
- United States
- Prior art keywords
- sand
- slurry
- scrubber
- particles
- water
- 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.)
- Expired - Lifetime
Links
- 239000004576 sand Substances 0.000 title description 70
- 238000000034 method Methods 0.000 title description 14
- 239000002002 slurry Substances 0.000 description 18
- 239000002245 particle Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000000576 coating method Methods 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000005201 scrubbing Methods 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 238000010924 continuous production Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000013072 incoming material Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 sand compound Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
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
Definitions
- This invention relates to a method for reclaiming used foundry sand, such as core sand.
- a suitable binder consisting of clay and/or organic materialto form a plastic mixture that is capable of being formed into, and retaining shapes imparted thereto.
- foundry cores such mixtures are shaped and then baked to increase their strength so that they are capable of withstanding any force to which they might be subjected duringV casting.
- the binders used for these mixtures are In addition to this troublesome coating, the used foundry sand is further contaminated with sand fines, clay, metal and other foreign materials, all of which must be removed before the sand is suitable for re-use,
- 'Another object is to provide an' improved process for reclaiming used foundry sand which includes a novel method for scrubbing the sand particles to remove the coating of binder deposited on the surface thereof.
- Another object is to provide an eicient method for continuously scrubbing used sand which comprises employing as an abrasive in the scrubber recycled sand from which nes, clay and carbonaceous surface films, which normally function as a lubricant between sand particles, have been removed.
- Figure 1 is a diagrammatic representation of apparatus suitable for practicing the continuous process of the invention.
- Figure 2 shows a portion of the apparatus of Figure l, which has been somewhat modified.
- Mold and core sand which has been previously broken up to granular size and from which tramp metal has been removed by conventional magnetic means is charged continuously into primary classifier 10, together with water supplied through pipe 12.
- the Vclassifier consists of a cylindrical vessel having a conical bottom with a discharge claimed) sand which has been discharged from the tert l n l'rvatentedMar. 5, 19.57
- a funnel 14 is centrally disposed within the cylinder near the upper open end thereof with its" restricted end connected with a drain conduit 16 extending in a generally downward direction and piercing ⁇ vthc wall of the vessel 10.
- the used sand and water introduced into the classifier forms a slurry or ilowable mixture.
- the sand fines, clay, and other more buoyant foreign materials float to the surface and are carried by the overflow stream into the funnel'14 and are discharged from the conduit 16 to Waste.
- the slurry of the heavier sand particles ows by gravity from the primary classiier 10, through conduit 20j and into a scrubber 22.
- the scrubber consists of a tankl or container 24 having-an impeller 28 driven by a rnotor 26 disposed in the lower central part of the tank.y An overiiow spout or chute 30 located in the wall of the tank nearthe top thereof provides for discharge of the scrubbed sand.
- a spreader tiume 42 over the entrance opening of the tank 41 causes the incoming material to be distributed evenly over the surface of the tank.
- the lower end of the tapered tube 44 is surrounded by an annular ring 46 which is adapted to direct jets of water from valved supply line 48 into the tube.
- the velocity of the upwardly owing stream is adjusted so as to carry the lighter contaminating particles and foreign material to the surface from which they llow to waste through spillway 50. Only cleaned sand grains larger than a predetermined size are permitted to discharge by gravity through the tapered tube 44.
- the opening in the end of tube 44 is relatively small in cross section so that the ow of water and'sand therethrough is less than the tlow of material into the classifier; thus a substantially constant rate of overflow of water and contaminating material into the spillway 50 is assured.
- the lower end of the discharge tube 44 connects t-o a closed reservoir or container 60 having a conical bottom and two valved discharge conduits 62 and 64 leading therefrom.
- Conduit 62y delivers reclaimed sand slurry to the scrubber 24 for ⁇ purposes previously pointed out.
- the remainder of the output of reclaimed sand slurry is delivered to a centrifuge 66 or other dewatering device for removal of most of the water, and then to -a drier in which the balance of the water is evaporated. Dry, cleaned sand discharged from the drier is ready for use in preparing foundry cores and molds.
- valves in outlet conduits 62 and 64 must be closed temporarily, and the incoming material more than fills the reservoir 60, water will rise in the pipe 63 and be discharged into the trough 50 to waste.
- the top of the reservoir ⁇ 60 is open.
- the discharge tube 44 from classifier 40 is equipped with a valve 45.
- the ow of material into the reservoir 60 may be controlled by adjusting the valve 45 anywhere from fully open to fully closed.
- slurries ofincoming material normally discharged from classiiier 40 in volume sufiicient to overflow reservoir 60 may be held back by means of valve 4S, with the overflow being discharged through the trough 50.
- recycled sand is being continuously separated from the ne particles of adhered coating removed therefrom as the sand moves from the scrubber to the secondary classifier, and back to the scrubber.
- p referably from 70 to 90%, with the remainder being removed for use.
- the amount of sand recycled will vary with the source of the used sand, some being more .diliicult to scrub than others. For example, sand used with iron castings requires about .87 to 8.8% recycle for eiffective scrubbing, while that used for steel requires only about 75% recycle sand.
- the formulation of the core or mold sand compound will also aiect the amount of recycling necessary. Generally, the more tenaciously the contaminating coating is adhered to the .used sand, the longer it will have to .be scrubbed; and consequently, the larger the proportion .of ⁇ sand that must be recycled.
- the ow of sand and water mixture through the apparatus is rapid and continuous, thus keeping the sand in suspension at all times so that it can be handled eiciently in the various pieces of equipment comprising the present apparatus.
- a process for reclaiming used foundry sand which comprises forming a owable slurry of said sand in water, separating the more buoyant sand fines and contaminants from the heavier sand particles in Vthe slurry, adding cleaned reclaimed sand to said slurry and agitating thc resulting mixture to scrub said heavier sand particles free of the contaminating coating thereon. separating the freed coating from the slurry and evaporating the Water from the slurry to provide dry clean sand.
- a continuous process for reclaiming used foundry sand which comprises charging said sand and water into a primary classifier to form a owable slull'lvr and ,to separate the more buoyant sand nes and contaminants from the heavier sand particles, passing the slurry of heavier particles through a scrubber to separate by abrasion from said particles the contaminating coating adhered thereto, passing the Vslurry mixture of scrubbed sand and freed contaminating particles into a secondary classifier for removing the contaminating particles therefrom, collecting the slurry of scrubbed sand in a reservoir, recycling a major proportion of said sand through said scrubber to serve as the abrasive in scrubbing the contaminated sand, and discharging a minor proportion of said sand to a drier to dry the sand for reuse.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Description
March 5, 1957 P. C. WILL ETAL.
METHOD FOR RECLAIMING USED FOUNDRY SND Filed Feb. l, 1954 Il NE frzdnZZ/j' Phi/flip c. .zz/ZZ Rog L. Lace nited States Patent O F -METHOD FOR RECLIMING USED FOUNDRY AND Phillip C. Will, Oak Park, and Roy L. Luce, Chicago, Ill., assignors to The Hydro-Blast Corporation, Chicago, Ill., a corporation of Illinois Application February 1, 1954, Serial No. 407,446
3 Claims. (Cl. 22-217) This invention relates to a method for reclaiming used foundry sand, such as core sand. YThis sand is mixed with a suitable binder consisting of clay and/or organic materialto form a plastic mixture that is capable of being formed into, and retaining shapes imparted thereto. In making foundry cores such mixtures are shaped and then baked to increase their strength so that they are capable of withstanding any force to which they might be subjected duringV casting. The binders used for these mixtures are In addition to this troublesome coating, the used foundry sand is further contaminated with sand fines, clay, metal and other foreign materials, all of which must be removed before the sand is suitable for re-use,
It is an object of this invention to provide an efficient and economical continuous process for converting used foundry sand into relatively clean sand, free of contarninants and suitable for use alone or. with virgin sand for making foundry Vcores and molds.
'Another object is to provide an' improved process for reclaiming used foundry sand which includes a novel method for scrubbing the sand particles to remove the coating of binder deposited on the surface thereof.
It is a further object to provide a process in which the scrubbing of the used sand is accomplished by abrasion of a slurry of said sand in admixture with a portion of reclaimed sand which has been recycled through the scrubber.
Another object is to provide an eicient method for continuously scrubbing used sand which comprises employing as an abrasive in the scrubber recycled sand from which nes, clay and carbonaceous surface films, which normally function as a lubricant between sand particles, have been removed.
Other objects and advantages of our process will become apparent from the following description of our invention taken in conjunction with the accompanying drawings in which:
Figure 1 is a diagrammatic representation of apparatus suitable for practicing the continuous process of the invention, and
Figure 2 shows a portion of the apparatus of Figure l, which has been somewhat modified.
Mold and core sand which has been previously broken up to granular size and from which tramp metal has been removed by conventional magnetic means is charged continuously into primary classifier 10, together with water supplied through pipe 12. The Vclassifier consists of a cylindrical vessel having a conical bottom with a discharge claimed) sand which has been discharged from the tert l n l'rvatentedMar. 5, 19.57
ICC
opening therein connecting to pipe 20 containing a lvalve 18. A funnel 14 is centrally disposed within the cylinder near the upper open end thereof with its" restricted end connected with a drain conduit 16 extending in a generally downward direction and piercing `vthc wall of the vessel 10. The used sand and water introduced into the classifier forms a slurry or ilowable mixture. The sand fines, clay, and other more buoyant foreign materials float to the surface and are carried by the overflow stream into the funnel'14 and are discharged from the conduit 16 to Waste. The slurry of the heavier sand particles ows by gravity from the primary classiier 10, through conduit 20j and into a scrubber 22. The scrubber consists of a tankl or container 24 having-an impeller 28 driven by a rnotor 26 disposed in the lower central part of the tank.y An overiiow spout or chute 30 located in the wall of the tank nearthe top thereof provides for discharge of the scrubbed sand. Reference is hereby made to Patent No. 2,637,3304
for a further detailed description of this apparatus and its function.
Up to this point the process is similarto these known and previously disclosed. However, instead 'of following the usual procedure of agitating the used sand alone we' depart from standard practice by recycling to thcslurry in the scrubber, a portion of the partially scrubbed ,(ref
minal point of the apparatus. The source Yof this sand and its treatment prior to discharge .into the scrubber will be explained hereinbelow. We have found that by vigor-` ously agitating the used sand slurry'in the Vpresence of added reclaimed sand, the greater proportion of which is sharp and free of surface coating, the contaminating coat-1v ing of carbonfclay, fines and organic binder remaining adhered to the used sand deliveredpfr-om the primary clas` silier is much more effectively removed in considerably shorter time. Adhered contaminating coatings function as a lubricant between the grains' and 'reduce the electiveness of the sand vgrains as an abrasive. Hence, reclaimed' sand, from which the coating has been at least partially. removed, is superior in abrasive action-to' sand which still' bears the contaminating coating.
- Circulation of the4 slurry within the` scrubber dueto agitationl by the impellerZS-causes discharge of sand par" ticles, free of contaminating coating, from a spout or chute 30 into pumping tank 32. Make up water may be added to tank 32 as required to reduce the sand .to pumping consistency, through water line 34. The sand pump 36 in line 38, which connects the pumping tank 3.2 to a secondary classifier 40, lifts the slurry of cleaned sand grains, together with the loose particles of contaminating coating removed therefrom, to the secondary classifier. This classifier is of the hydraulic counterow type and comprises a cylindrical tank 41 terminating in a tapered discharge tube 44. A spreader tiume 42 over the entrance opening of the tank 41 causes the incoming material to be distributed evenly over the surface of the tank. The lower end of the tapered tube 44 is surrounded by an annular ring 46 which is adapted to direct jets of water from valved supply line 48 into the tube. The water lloivnsupwardly continuously, counter to the slurry of incoming sand particles, and contaminating particles and other foreign material removed therefrom in the scrubber. The velocity of the upwardly owing stream is adjusted so as to carry the lighter contaminating particles and foreign material to the surface from which they llow to waste through spillway 50. Only cleaned sand grains larger than a predetermined size are permitted to discharge by gravity through the tapered tube 44. The opening in the end of tube 44 is relatively small in cross section so that the ow of water and'sand therethrough is less than the tlow of material into the classifier; thus a substantially constant rate of overflow of water and contaminating material into the spillway 50 is assured.
The lower end of the discharge tube 44 connects t-o a closed reservoir or container 60 having a conical bottom and two valved discharge conduits 62 and 64 leading therefrom. Conduit 62y delivers reclaimed sand slurry to the scrubber 24 for` purposes previously pointed out. The remainder of the output of reclaimed sand slurry is delivered to a centrifuge 66 or other dewatering device for removal of most of the water, and then to -a drier in which the balance of the water is evaporated. Dry, cleaned sand discharged from the drier is ready for use in preparing foundry cores and molds.
If, for some reason, the valves in outlet conduits 62 and 64 must be closed temporarily, and the incoming material more than fills the reservoir 60, water will rise in the pipe 63 and be discharged into the trough 50 to waste.
'In a modification of the invention shown in Figure 2 the top of the reservoir `60 is open. The discharge tube 44 from classifier 40 is equipped with a valve 45. In this embodiment, the ow of material into the reservoir 60 may be controlled by adjusting the valve 45 anywhere from fully open to fully closed.
Hence, slurries ofincoming material normally discharged from classiiier 40 in volume sufiicient to overflow reservoir 60 may be held back by means of valve 4S, with the overflow being discharged through the trough 50.
It will be noted that recycled sand is being continuously separated from the ne particles of adhered coating removed therefrom as the sand moves from the scrubber to the secondary classifier, and back to the scrubber. We have found that for eicient continuous operation of the process itis desirable yto discharge a maior proportion of the scrubbed sand slurry back into the scrubber, p referably from 70 to 90%, with the remainder being removed for use. The amount of sand recycled will vary with the source of the used sand, some being more .diliicult to scrub than others. For example, sand used with iron castings requires about .87 to 8.8% recycle for eiffective scrubbing, while that used for steel requires only about 75% recycle sand. The formulation of the core or mold sand compound will also aiect the amount of recycling necessary. Generally, the more tenaciously the contaminating coating is adhered to the .used sand, the longer it will have to .be scrubbed; and consequently, the larger the proportion .of `sand that must be recycled.
area51;
The ow of sand and water mixture through the apparatus is rapid and continuous, thus keeping the sand in suspension at all times so that it can be handled eiciently in the various pieces of equipment comprising the present apparatus.
It will be understood kthat the embodiments of the invention shown in detail herein are illustrative only and are not intended as a deiinition of the scope of the invention, reference being had for this purpse to the appended claims.
What is claimed is:
1. A process for reclaiming used foundry sand which comprises forming a owable slurry of said sand in water, separating the more buoyant sand fines and contaminants from the heavier sand particles in Vthe slurry, adding cleaned reclaimed sand to said slurry and agitating thc resulting mixture to scrub said heavier sand particles free of the contaminating coating thereon. separating the freed coating from the slurry and evaporating the Water from the slurry to provide dry clean sand.
2. A continuous process for reclaiming used foundry sand which comprises charging said sand and water into a primary classifier to form a owable slull'lvr and ,to separate the more buoyant sand nes and contaminants from the heavier sand particles, passing the slurry of heavier particles through a scrubber to separate by abrasion from said particles the contaminating coating adhered thereto, passing the Vslurry mixture of scrubbed sand and freed contaminating particles into a secondary classifier for removing the contaminating particles therefrom, collecting the slurry of scrubbed sand in a reservoir, recycling a major proportion of said sand through said scrubber to serve as the abrasive in scrubbing the contaminated sand, and discharging a minor proportion of said sand to a drier to dry the sand for reuse.
3. The process of claim 2 in which 70 to 90% o f the reclaimed sand is recycled through said scrubber.
References (ited in the nl@ of this patent UNITED STATES PATENTS 2,383,045 Den Breejen et al Aug. 2l, `1945 2,477,948 Allen Aug. 2, 1949 2,478,461 Connolly Aug. 9, 1949 2,480,748 Luce et al, Aug. 30, 1949 2,637,330 Webster May 5, 1953
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US407446A US2783511A (en) | 1954-02-01 | 1954-02-01 | Method for reclaiming used foundry sand |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US407446A US2783511A (en) | 1954-02-01 | 1954-02-01 | Method for reclaiming used foundry sand |
Publications (1)
Publication Number | Publication Date |
---|---|
US2783511A true US2783511A (en) | 1957-03-05 |
Family
ID=23612118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US407446A Expired - Lifetime US2783511A (en) | 1954-02-01 | 1954-02-01 | Method for reclaiming used foundry sand |
Country Status (1)
Country | Link |
---|---|
US (1) | US2783511A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277540A (en) * | 1963-05-02 | 1966-10-11 | Buhrer Erwin | Device for refining foundry sand in a continuous manner |
US4149581A (en) * | 1977-04-25 | 1979-04-17 | Cole Manufacturing Company | Fine particle recycling method and apparatus |
US4303453A (en) * | 1979-06-06 | 1981-12-01 | Foundry Design Corp. | Method and apparatus for removing sand from castings |
EP0257446A2 (en) * | 1986-08-21 | 1988-03-02 | BMD Badische Maschinenfabrik Durlach GmbH | Process and apparatus for wet-regenerating used foundry sand |
DE3701988A1 (en) * | 1987-01-23 | 1988-08-04 | Linnhoff & Thesenfitz Masch | METHOD AND DEVICE FOR THE PROCESSING OF SCHUETTGUT, ESPECIALLY BLASTED |
US4960162A (en) * | 1989-02-17 | 1990-10-02 | Esco Corporation | Method of reclaiming foundry sand |
DE4035263A1 (en) * | 1990-11-02 | 1992-05-07 | Kuettner Gmbh & Co Kg Dr | METHOD AND DEVICE FOR CLEANING BULK GOODS |
DE4190731C1 (en) * | 1990-03-20 | 1993-02-11 | Kuettner Gmbh & Co. Kg, 4300 Essen, De | |
US5540270A (en) * | 1993-06-26 | 1996-07-30 | Noell Abfall-Und Energietechnik Gmbh | Process for wet regeneration of granular bulk materials charged with impurities and pollutants |
WO2007082747A1 (en) * | 2006-01-18 | 2007-07-26 | Hos Hottinger Systems Gbr | Method and device for recovering a core-mould sand mixture |
US10493466B2 (en) * | 2017-02-24 | 2019-12-03 | KB Foundry Services, LLC | Method and system for cleaning sand |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2383045A (en) * | 1942-03-30 | 1945-08-21 | Hydro Blast Corp | Method and apparatus for sand reclamation |
US2477948A (en) * | 1946-10-12 | 1949-08-02 | Dorr Co | Sand scrubber |
US2478461A (en) * | 1946-03-16 | 1949-08-09 | Nichols Eng & Res Corp | Apparatus and method for treating foundry sand |
US2480748A (en) * | 1945-06-28 | 1949-08-30 | Hydro Blast Corp | Apparatus for reclaiming used foundry sand |
US2637330A (en) * | 1946-12-20 | 1953-05-05 | Hydro Blast Corp | Apparatus for cleaning granular material |
-
1954
- 1954-02-01 US US407446A patent/US2783511A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2383045A (en) * | 1942-03-30 | 1945-08-21 | Hydro Blast Corp | Method and apparatus for sand reclamation |
US2480748A (en) * | 1945-06-28 | 1949-08-30 | Hydro Blast Corp | Apparatus for reclaiming used foundry sand |
US2478461A (en) * | 1946-03-16 | 1949-08-09 | Nichols Eng & Res Corp | Apparatus and method for treating foundry sand |
US2477948A (en) * | 1946-10-12 | 1949-08-02 | Dorr Co | Sand scrubber |
US2637330A (en) * | 1946-12-20 | 1953-05-05 | Hydro Blast Corp | Apparatus for cleaning granular material |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277540A (en) * | 1963-05-02 | 1966-10-11 | Buhrer Erwin | Device for refining foundry sand in a continuous manner |
US4149581A (en) * | 1977-04-25 | 1979-04-17 | Cole Manufacturing Company | Fine particle recycling method and apparatus |
US4303453A (en) * | 1979-06-06 | 1981-12-01 | Foundry Design Corp. | Method and apparatus for removing sand from castings |
EP0257446A2 (en) * | 1986-08-21 | 1988-03-02 | BMD Badische Maschinenfabrik Durlach GmbH | Process and apparatus for wet-regenerating used foundry sand |
EP0257446A3 (en) * | 1986-08-21 | 1988-05-11 | BMD Badische Maschinenfabrik Durlach GmbH | Process and apparatus for wet-regenerating used foundry sand |
DE3701988A1 (en) * | 1987-01-23 | 1988-08-04 | Linnhoff & Thesenfitz Masch | METHOD AND DEVICE FOR THE PROCESSING OF SCHUETTGUT, ESPECIALLY BLASTED |
US4960162A (en) * | 1989-02-17 | 1990-10-02 | Esco Corporation | Method of reclaiming foundry sand |
DE4190731C1 (en) * | 1990-03-20 | 1993-02-11 | Kuettner Gmbh & Co. Kg, 4300 Essen, De | |
DE4035263A1 (en) * | 1990-11-02 | 1992-05-07 | Kuettner Gmbh & Co Kg Dr | METHOD AND DEVICE FOR CLEANING BULK GOODS |
US5540270A (en) * | 1993-06-26 | 1996-07-30 | Noell Abfall-Und Energietechnik Gmbh | Process for wet regeneration of granular bulk materials charged with impurities and pollutants |
WO2007082747A1 (en) * | 2006-01-18 | 2007-07-26 | Hos Hottinger Systems Gbr | Method and device for recovering a core-mould sand mixture |
US10493466B2 (en) * | 2017-02-24 | 2019-12-03 | KB Foundry Services, LLC | Method and system for cleaning sand |
US11052405B2 (en) * | 2017-02-24 | 2021-07-06 | KB Foundry Services, LLC | Method and system for cleaning sand |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2813318A (en) | Method and apparatus for treating granular material | |
US2783511A (en) | Method for reclaiming used foundry sand | |
US4303453A (en) | Method and apparatus for removing sand from castings | |
US4289519A (en) | Method of dewatering granulated-slag slurry | |
US2261947A (en) | Foundry practice | |
US2478461A (en) | Apparatus and method for treating foundry sand | |
US2331102A (en) | Sand treating system and method | |
US6834706B2 (en) | Process for recovering sand and bentonite clay used in a foundry | |
US2206980A (en) | Gravity sei aration of ores | |
EP0414388B1 (en) | Method for reconditioning green foundry sand | |
US3237351A (en) | Method for handling grit | |
US2383045A (en) | Method and apparatus for sand reclamation | |
USRE22191E (en) | Gravity separation of ores | |
US2190637A (en) | Process of separating fragmentary materials | |
US1656271A (en) | Cleaning of coal | |
US11052405B2 (en) | Method and system for cleaning sand | |
US3657997A (en) | Recovering metal values | |
US2480748A (en) | Apparatus for reclaiming used foundry sand | |
US2330542A (en) | Dewatering of suspended solids | |
US1381706A (en) | Process of separating oils from foots | |
US3508660A (en) | Slag extracting apparatus | |
JPS5633149A (en) | Reproductive treatment and its device for casting waste sand | |
US2667014A (en) | Wet blasting apparatus | |
US2227851A (en) | Sewage disposal | |
US3583560A (en) | Apparatus and method for cleaning and concentrating fine solids |