CN1054021A - Upgrade the method for molding sand - Google Patents
Upgrade the method for molding sand Download PDFInfo
- Publication number
- CN1054021A CN1054021A CN90103344A CN90103344A CN1054021A CN 1054021 A CN1054021 A CN 1054021A CN 90103344 A CN90103344 A CN 90103344A CN 90103344 A CN90103344 A CN 90103344A CN 1054021 A CN1054021 A CN 1054021A
- Authority
- CN
- China
- Prior art keywords
- sand
- regeneration
- neutralize
- neutralization
- value
- 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.)
- Pending
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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
- B22C5/18—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
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- 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)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Treatment Of Sludge (AREA)
Abstract
The present invention relates to upgrade the process that contains the single of organic and/or inorganic binder or mix molding sand.Wherein, the sand that will contain organic cementitious matter after thermal reclamation or the sand that contains inorganic binder after Re Fa and mechanical process regeneration, neutralize with a kind of suitable alkali or acid, make it have pH value between 6 and 8 subsequently in its pH value by a kind of measurement method determination after the regeneration according to it.
Description
The renovation process of wet method, Mechanical Method, Re Fa or its combination of the molding sand of a class is in common knowledge for people as the quartz sand that contains organic or inorganic binder, olivine sand, zircon sand, chromium sand etc.The purpose of these regeneration technologies provides and can replace or as fresh sand and reusable more fresh sand.Simultaneously, eliminate environmentally hazardous material in the molding sand by regeneration.If organic bonding sand does not contain and does not burn or when unvaporized alkalescence, acidity or other interfering component, only need usually regenerate just passable with heating.
The system sand of inorganic gluing or mixed sand, the particularly sand of crossing with bentonite in treatment originally must be with Re Fa and mechanical process regeneration, to produce a kind of reusable sand.
The method that these are known, for example have and be difficult to the alkalescence that maybe can not remove or the organic binder system of acidic components, particularly use the system sand or the mixed sand of inorganic binder, its shortcoming is to have the character that departs from fresh sand, for example pH value, electrical conductivity fish-egg shape degree, mud content or the like.Such reclaimed sand character more or less is disadvantageous, especially is unfavorable for repeating to be used for manufacturing core.Particularly when having the core sand of artificial resin cementitious matter, the relatively poor character of such reclaimed sand causes that rigidity descends, sand mixture reduces process time, the consumption of cementitious matter increases or the like.
The method that the purpose of this invention is to provide a kind of the above-mentioned type is used this method, can handle the reclaimed sand of Re Fa and/or Mechanical Method, makes it resemble new sand then or similar in appearance to new sand.
Solve this purpose according to the present invention, wherein, neutralize with suitable alkali or acid containing the sand that contains inorganic binder behind a kind of sand of organic binder or hot method and the mechanical process regeneration after the thermal reclamation, this depends on after regeneration its pH value of determining with the method for measurement of for example titration, afterwards so that make its pH value between 6 and 8, preferably between 6.8～7.5.
In addition, make said sand then carry out drying through wet purification with after neutralization.Use NH in order to neutralize
4OH is as alkali or use sulfuric acid or hydrogen-oxygen acid.The amount that joins the concentrated sulfuric acid in the sand that is alkalescence after the regeneration is 3～50ml/kg sand, preferably 8～12ml/kg sand.The NH that adds 25% in the sand that is acid after regenerating
4The amount of OH is 3～40ml/kg sand, preferably 12ml/kg sand.Neutralize in the circulatory system of a sealing purify and in one single jar alternately, and the neutralization solution after will using purifies by filtration, in being used further to after upgrading with washings with technical process in.
Essence of the present invention is in the additional wet method and the sand grains of the such class of purifying image-stone English particle, for example handle the back and then purify with organic and/or inorganic binder (bentonite) processing at first, its pH value is conformed to the numerical value of fresh sand with electrical conductivity with Mechanical Method in hot method.
Organic binder is thoroughly burnt, or the processing by Re Fa and Mechanical Method carries out dead roasting with inorganic binder such as clay or bentonite, and extract fully and separate from sand grains by mechanical method of purification.According to the present invention, then this reclaimed sand is neutralized and purifies under dampness in container.Mixture is stirred in process tank or stirs to keep and to quicken technical process.
The needs of neutralization additive are to measure out easily by the titration of 50 to 100g sand samples, that is to say that when sand is in Re Fa maybe may be the state of mechanical process regeneration.
Experimentize when adding the nertralizer of a kind of suitable acid, unexpectedly have some muddiness in the aqueous solution as the reclaimed sand of inorganic gluing.Obviously, because neutralization makes the dirt, mud or the cementitious matter that still adhere on the sand grains that slight separation take place, therefore also just eliminated the bonding and adhesion of static of each particle.
After neutralization or cleaning then drying, when observing under electron microscope, the sand of handling has had than the obvious outward appearance that more cleans in the past, and has and the same or analogous various character of fresh sand, shown in following examples I and II.
Embodiment 1
Quartz sand regeneration: AFS60.3
The every kg of the initial reclaimed sand of character is with the fresh sand of 10 milliliters of contrasts
Concentrated sulfuric acid neutralization
PH value 9.6 7.4 about 7.0
Electrical conductivity 172 4 about 0
μs/cm
Fervid loss 0.17 0.14 about 0
（%）
Clay content 1.04 0.34 about 0.3
%
Fish-egg shapeization 0.93 0.79 about 0
Degree
The embodiment II
Quartz sand regeneration: AFS45
The every kg sand 12ml NH of the initial reclaimed sand of character
4OH(25%)
Neutralization
PH value 3.6 7.2
Electrical conductivity 189 12
μs/cm
The neutralization of reclaimed sand is shown in accompanying drawing.
The sand of having regenerated is fed neutralizing tank 3 from the sand device 1 that supplies that is arranged in belt-type scale 2 tops, and belt scale wherein is used to regulate each weight of loading.With for the sand time, will be in a kind of pump out from a storage tank 4 with pump 5 and come the neutralizing tank 3 with solvent, this neutralizing tank 3 is controlled by a full horizontal display (not marking in the drawings).In neutralizing tank 3, during stowing operation and neutralization, carry out the stirring of material and stir with the alr mode of schematic view illustrating.After neutralization, extract and feed back solution out storage tank 4 through a filter 6, pump 7 and filter 8.With washing agent or fresh water to upgrading with the neutralization solution of crossing and new acid or the adding of alkali are carried out with container 16.After neutralization, the washing of the reclaimed sand that had neutralized and purification, method is to introduce a kind of wash solution from storage tank 13 in neutralizing tank 3, whipping process is proceeded simultaneously.Mixture with washed-out sand water is pumped out in the separator 10 from jar 3 by pump 9 then.Sand is separated in separator 10 with the water that contains mud.Mud water purifies in filter 12 and feeds back storage tank 13 with pump 11.In used washings, add fresh water here.Will be isolated from separator, purified and in the sand of becoming reconciled carry out drying with rotary dryer 14, be transported to storage bin 15 then.
Neutralization and washing or purification are alternately carried out in two circulatory systems that seal respectively.Be to regulate the degree of neutralization of wash solution, in acid with the time also can add alkali, otherwise perhaps.The belt scale also can be supplied several neutralizing tanks by a distributor belt.Also can use several separators at this place.Because environment, neutralization and purification process carry out with water consumption closed circulation ground that may be minimum.After complete reaction, neutralization solution is discharged from jar together with the body refuse that extracts.Afterwards, via filter mud is separated.In the time of needs, with upgrading with new acid or alkali and fresh water or washings of having crossed filter and always feed back in the cyclic process of processing next time, for example use a kind of storage tank of centre with used neutralization solution.
Another embodiment is the example of the mixed sand of following a kind of inorganic gluing, wherein will be initially carry out Re Fa and Mechanical Method is handled the sand that obtains regenerating with old sand, then it is neutralized and purified treatment.
Responsive especially ice chest core sand mixture was made a strength test and the fresh sand contrast in the variant stage of handling.
The embodiment III
Bentonite is used by the sand of I with the every kg of Re Fa-Mechanical Method
The old sand of mesh analysis is by the concentrated sulfuric acid neutralization of the sand 10ml of I regeneration
Ⅰ Ⅱ Ⅲ
% % %
0.71mm 0.2 0 0.1
0.5mm 0.5 0.7 0.9
0.355mm 3.6 6.1 5.7
0.25mm 25.1 22.3 21.5
0.18mm 52.8 48.0 50.2
0.125mm 14.2 21.0 20.0
0.09mm 3.3 1.8 1.5
0.063mm 0.3 0.1 0.1
0.02mm 0 0 0
20.02mm 0 0 0
PH value 9.8 9.7 7.1
Electrical conductivity μ s/cm 976 165 3
Mud % 8.26 0.93 0.32
Fervid loss % 2.57 0.17 0.14
Fish-egg shape degree 2.3 0.89 0.77
The contrast of ice chest sand sample bending strength, the N/cm of unit
2
Sand mixture: 30% fresh sand AFS about 60
70% heat-mechanical process regeneration
0.8% artificial resin 352T14
0.8% artificial resin 652TEA700
Test period sand II sand III 100 fresh sands
150 260 230
1/2 hour 185 390 340
1 hour 190 420 410
2 hours 192 440 420
24 hours 225 450 460
Claims (11)
1, is used to upgrade the method for the molding sand that contains the single of organic and/or inorganic binder or mix, it is characterized in that: the sand that will contain organic cementitious matter after thermal reclamation or the sand that contains inorganic binder after Re Fa and mechanical process regeneration, neutralize with a kind of suitable alkali or acid, according to its its pH value after regeneration, make the pH value that has after the said sand neutralization between 6 and 8 with a kind of measurement method determination.
2, method as claimed in claim 1, the pH value of said sand is between 6.8 and 7.5 after it is characterized in that neutralizing.
3, method as claimed in claim 1 is characterized in that sand then carries out drying through wet purification with after neutralization.
4, method as claimed in claim 1 is characterized in that adopting NH in order to neutralize
4OH is as alkali, or employing sulfuric acid or hydrofluoric acid.
5, method as claimed in claim 1 is characterized in that will being added in the sand of regeneration back for alkalescence by the concentrated sulfuric acid of every kg sand for 3～50 milliliters of amounts in order to neutralize.
6, method as claimed in claim 1 is characterized in that will being added in the sand of regeneration back for alkalescence by the concentrated sulfuric acid of every kg sand for 8～12 milliliters of amounts in order to neutralize.
7, method as claimed in claim 1 is characterized in that in order to neutralize, will be by the NH of 25% concentration of 3～40 milliliters in every kg sand
4OH is added to the regeneration back in the acid sand.
8, method as claimed in claim 1 is characterized in that in order to neutralize, will be by the NH of 25% concentration of 12 milliliters in every kg sand
4OH is in the sand of acidity after being added to regeneration.
9, method as claimed in claim 1, it is characterized in that in a closed cycle system, neutralizing and purifying and in one single jar alternately.
10,, it is characterized in that the neutralization solution after using is purified by filtration, in being used further to after upgrading with washings and in the technical process as the method for claim 1 or 6.
11, handle and the molding sand of available renewal with Re Fa and/or Mechanical Method, its processing method depends on wherein contained cementitious matter, and neutralization after this makes its pH value between 6.8 and 7.5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4004553.6 | 1990-02-14 | ||
| DE4004553A DE4004553C1 (en) | 1990-02-14 | 1990-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1054021A true CN1054021A (en) | 1991-08-28 |
Family
ID=6400137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90103344A Pending CN1054021A (en) | 1990-02-14 | 1990-07-05 | Upgrade the method for molding 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) | FI902822A (en) |
| HU (1) | HUT58008A (en) |
| NO (1) | NO902410L (en) |
| PL (1) | PL285083A1 (en) |
| PT (1) | PT94164A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059319A (en) * | 2011-01-19 | 2011-05-18 | 昆明理工大学 | Joint regeneration method for old resin sand |
| CN101715376B (en) * | 2007-06-11 | 2012-05-09 | 德国古斯塔夫·爱立许机械制造有限公司 | Method for preparing molding sand |
| CN102500458A (en) * | 2011-11-28 | 2012-06-20 | 河海大学 | Sand washing method and special device thereof |
| CN112570646A (en) * | 2019-09-27 | 2021-03-30 | 芬恩回收有限公司 | Method and apparatus for cleaning foundry sand |
Families Citing this family (7)
| 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 |
| 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 |
| EP3586995B2 (en) * | 2018-06-29 | 2024-04-24 | Nemak, S.A.B. de C.V. | Method 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 |
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/FI902822A/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 Application Discontinuation
- 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
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715376B (en) * | 2007-06-11 | 2012-05-09 | 德国古斯塔夫·爱立许机械制造有限公司 | Method for preparing molding sand |
| CN102059319A (en) * | 2011-01-19 | 2011-05-18 | 昆明理工大学 | Joint regeneration method for old resin sand |
| CN102059319B (en) * | 2011-01-19 | 2012-12-19 | 昆明理工大学 | Joint regeneration method for old resin sand |
| CN102500458A (en) * | 2011-11-28 | 2012-06-20 | 河海大学 | Sand washing method and special device thereof |
| CN102500458B (en) * | 2011-11-28 | 2014-07-09 | 河海大学 | Sand washing method and special device thereof |
| CN112570646A (en) * | 2019-09-27 | 2021-03-30 | 芬恩回收有限公司 | Method and apparatus for cleaning foundry sand |
Also Published As
| Publication number | Publication date |
|---|---|
| NO902410L (en) | 1991-08-15 |
| CA2022769A1 (en) | 1991-08-15 |
| DK149890D0 (en) | 1990-06-19 |
| EP0446402A1 (en) | 1991-09-18 |
| DK149890A (en) | 1991-08-15 |
| HUT58008A (en) | 1992-01-28 |
| BR9003152A (en) | 1991-11-12 |
| PT94164A (en) | 1991-09-30 |
| HU903815D0 (en) | 1990-11-28 |
| CS219190A2 (en) | 1991-09-15 |
| JPH03238141A (en) | 1991-10-23 |
| FI902822A (en) | 1991-08-15 |
| PL285083A1 (en) | 1991-10-07 |
| KR910015345A (en) | 1991-09-30 |
| FI902822A0 (en) | 1990-06-06 |
| NO902410D0 (en) | 1990-05-31 |
| DE4004553C1 (en) | 1991-10-10 |
| DD297087A5 (en) | 1992-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |