CN104162630B - A kind of recycling method of casting discarded molding sand - Google Patents
A kind of recycling method of casting discarded molding sand Download PDFInfo
- Publication number
- CN104162630B CN104162630B CN201410450869.6A CN201410450869A CN104162630B CN 104162630 B CN104162630 B CN 104162630B CN 201410450869 A CN201410450869 A CN 201410450869A CN 104162630 B CN104162630 B CN 104162630B
- Authority
- CN
- China
- Prior art keywords
- sand
- molding sand
- parts
- reclaimed
- roasting
- 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 - Fee Related
Links
Abstract
It is an object of the invention to disclosing a kind of recycling method of casting discarded molding sand, old sand is reclaimed using centrifugal regenerating device mainly, more than 90% old sand can be reclaimed, this more than 90% old sand is carried out crushing, double roasting is carried out after magnetic separation and screening sorting process, after roasting, cooling treatment adds fresh sand, bentonite and waterglass, stir in puddle mixer and be blended, obtain the Novel sand for being suitable for Foundry Production.The mode that the present invention is combined with low-temperature bake using after baking, makes full use of counterflow heat exchanger waste heat in stove, reduces the pollution of waste gas, the quality of raising reclaimed sand, and alleviates the infringement of burner hearth and combustion chamber, extension device life-span.The present invention can make casting discarded molding sand be able to recycling, and its yield accounts for the 64% of the annual consumption molding sand total amount of enterprise.
Description
Technical field
The present invention relates to sand casting industry field, specifically a kind of recycling method of casting discarded molding sand.
Background technology
Molding sand is main Modeling Material in modern age Foundry Production, is the major part of discarded object produced by casting industry.China
More than 24,000,000 tons of annual foundry goods, and it is all the quartz sand of high-quality to cast from sand, national foundry industry application molding sand production casting
Part accounts for more than the 80% of all kinds of casting mold production foundry goods, need to consume more than 20,000,000 tons of fresh sand every year, while will also discharge substantial amounts of
Discarded sand, discarded sand are in sand casting, mix a kind of caking thing for boning and being formed with waterglass, and the iron that wherein adulterates is miscellaneous
Matter, such as can not carry out regeneration process to old sand so as to which the quality for reaching or being close to roughing sand carries out reuse, then may be by as discarded
Thing is thrown away, and so must cause severe contamination to surrounding environment, therefore, how to make molding sand old sand be circulated utilization, and this is also casting
Make the significant problem that enterprise must face.
Content of the invention
In sum, it is an object of the invention to disclosing a kind of recycling method of casting discarded molding sand, including
Following steps：
A. crushing-magnetic selection is processed
Used discarded molding sand is carried out crush before roasting, magnetic separation is processed, in order to separate metal residue and legacy sand,
Metal residue is transported to smelting furnace together with return scrap, and sand purity reaches 95%-99%, sieves sorting process passing through,
Sieve bucket from 40-70 mesh is screened, disabled sand and callable molding sand separating treatment, and the molding sand of recoverable will be by
It is delivered to roasting regeneration stove to be processed.
B. calcination process
The molding sand that a step process is crossed carries out a roasting through roaster, and temperature is 200-300 DEG C；Place into high temperature
It is 600～700 DEG C that roaster carries out the temperature of after baking, and the caking ability for destroying waterglass by heat drying removes sand grains
The vitrified bond film on surface.
In waste molding sand, the burning of carbon residue material needs enough oxygen, for this purpose, forced air supply equipment is provided with, and plus
With intelligentized control method, improve moving air temperature in roaster so as to uniformly can be heated to 200-300 DEG C most suitable
Sintering temperature：600～700 DEG C of second sintering temperature, by the organic matter burning-off in discarded sand,
Above-mentioned organic matter is mainly sodium metasilicate, potassium silicate.
C. cooling treatment
After molding sand after roasting is through supercooling, dedusting, reclaimed sand is obtained, be delivered to standby in sand hopper.
D. finished product molding sand is made
Add fresh sand in reclaimed sand again, add bentonite；Moulding sand additive is added, is stirred in puddle mixer and is blended, obtain
To the finished product molding sand for being suitable for Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand, by weight for be：
100 parts of reclaimed sand
Fresh sand 5-10 parts
Bentonite 0.5-0.7 parts
Waterglass 2-4 parts.
Its most preferred ratio is：
100 parts of reclaimed sand
6 parts of fresh sand
0.3 part of bentonite
3 parts of waterglass.
Advantages of the present invention and its advantage：
The mode that the present invention is combined with low-temperature bake using after baking, makes full use of in stove more than counterflow heat exchanger
Heat, reduces the pollution of waste gas, the quality of raising reclaimed sand, and alleviates the infringement of burner hearth and combustion chamber, extension device life-span.
The present invention can make casting discarded molding sand be able to recycling, and its yield accounts for the 64% of the annual consumption molding sand total amount of enterprise, is one
Energy-conserving and environment-protective technical scheme is planted, belongs to recycling economy, low-carbon (LC) low energy consumption meets national policy and reusing of energy source project planning.
Specific embodiment
Recycling for molding sand mainly reclaims old sand using centrifugal regenerating device, can reclaim more than 90% old sand, will
This more than 90% return sand is sufficiently pre-processed, then is added 5%～10% fresh sand, added the swelling of 0.5-0.7%
Soil；The waterglass of 2-4% is added, is stirred in puddle mixer and is blended, obtain the Novel sand for being suitable for Foundry Production.
Embodiment 1
A kind of recycling method of casting discarded molding sand, comprises the following steps：
A. crushing-magnetic selection is processed
Used discarded molding sand is carried out crush before roasting, magnetic separation is processed, in order to separate metal residue and legacy sand,
Metal residue is transported to smelting furnace together with return scrap, and sand purity reaches 95%-99%, sieves sorting process passing through,
From the sieve bucket screening of 70 mesh, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be defeated
Deliver to roasting regeneration stove to be processed.
B. calcination process
The molding sand that a step process is crossed carries out a roasting through roaster, and temperature is 200 DEG C；Place into high-temperature roasting
It is 600 DEG C that stove carries out the temperature of after baking, and the caking ability for destroying waterglass by heat drying removes the clay of sand grain surface
Sintered membrane.
C. cooling treatment
After molding sand after roasting is through supercooling, dedusting, reclaimed sand is obtained, be delivered to standby in sand hopper.
D. finished product molding sand is made
C is not walked fresh sand, adds bentonite；Moulding sand additive is added, in puddle mixer
Stirring is blended, and obtains the finished product molding sand for being suitable for Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand, by weight for be：
100 parts of reclaimed sand
7 parts of fresh sand
0.5 part of bentonite
4 parts of waterglass.
Embodiment 2
A kind of recycling method of casting discarded molding sand, comprises the following steps：
A. crushing-magnetic selection is processed
Used discarded molding sand is carried out crush before roasting, magnetic separation is processed, in order to separate metal residue and legacy sand,
Metal residue is transported to smelting furnace together with return scrap, and sand purity reaches 95%-99%, sieves sorting process passing through,
From the sieve bucket screening of 40 mesh, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be defeated
Deliver to roasting regeneration stove to be processed.
B. calcination process
The molding sand that a step process is crossed carries out a roasting through roaster, and temperature is 300 DEG C；Place into high-temperature roasting
It is 700 DEG C that stove carries out the temperature of after baking, and the caking ability for destroying waterglass by heat drying removes the clay of sand grain surface
Sintered membrane.
C. cooling treatment
After molding sand after roasting is through supercooling, dedusting, reclaimed sand is obtained, be delivered to standby in sand hopper.
D. finished product molding sand is made
C is not walked fresh sand, adds bentonite；Moulding sand additive is added, in puddle mixer
Stirring is blended, and obtains the finished product molding sand for being suitable for Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand, by weight for be：
100 parts of reclaimed sand
9 parts of fresh sand
0.7 part of bentonite
2 parts of waterglass.
Embodiment 3
A kind of recycling method of casting discarded molding sand, comprises the following steps：
A. crushing-magnetic selection is processed
Used discarded molding sand is carried out crush before roasting, magnetic separation is processed, in order to separate metal residue and legacy sand,
Metal residue is transported to smelting furnace together with return scrap, and sand purity reaches 95%-99%, sieves sorting process passing through,
From the sieve bucket screening of 50 mesh, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be defeated
Deliver to roasting regeneration stove to be processed.
B. calcination process
The molding sand that a step process is crossed carries out a roasting through roaster, and temperature is 250 DEG C；Place into high-temperature roasting
It is 650 DEG C that stove carries out the temperature of after baking, and the caking ability for destroying waterglass by heat drying removes the clay of sand grain surface
Sintered membrane.
C. cooling treatment
After molding sand after roasting is through supercooling, dedusting, reclaimed sand is obtained, be delivered to standby in sand hopper.
D. finished product molding sand is made
C is not walked fresh sand, adds bentonite；Moulding sand additive is added, in puddle mixer
Stirring is blended, and obtains the finished product molding sand for being suitable for Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand, by weight for be：
100 parts of reclaimed sand
6 parts of fresh sand
0.6 part of bentonite
3 parts of waterglass.
Claims (4)
1. a kind of recycling method of casting discarded molding sand, comprises the following steps：
A. crushing-magnetic selection is processed
Used discarded molding sand is carried out crush before roasting, magnetic separation is processed, in order to separate metal residue and legacy sand, metal
Residue is transported to smelting furnace together with return scrap, and sand purity reaches 95%-99%, then through screening sorting process, selects
The sieve bucket screening of 40-70 mesh；
B. calcination process
The molding sand that a step process is crossed carries out a roasting through roaster, and temperature is 200-300 DEG C；Place into high-temperature roasting
It is 600～700 DEG C that stove carries out the temperature of after baking；
C. cooling treatment
After molding sand after roasting is through supercooling, dedusting, reclaimed sand is obtained, be delivered to standby in sand hopper；
D. finished product molding sand is made
Fresh sand, bentonite and moulding sand additive are added in the reclaimed sand that step c is obtained, is stirred in puddle mixer and is blended, obtain
The finished product molding sand of suitable Foundry Production.
2. a kind of recycling method of casting discarded molding sand as claimed in claim 1, it is characterised in that：Described type
Sand additive is waterglass.
3. a kind of recycling method of casting discarded molding sand as claimed in claim 1, it is characterised in that：Described into
The adding proportion of product molding sand, by weight for be：
100 parts of reclaimed sand
Fresh sand 5-10 parts
Bentonite 0.5-0.7 parts
Waterglass 2-4 parts.
4. a kind of recycling method of casting discarded molding sand as claimed in claim 3, it is characterised in that：Described into
The ratio of product molding sand, by weight for be：
100 parts of reclaimed sand
6 parts of fresh sand
0.6 part of bentonite
3 parts of waterglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410450869.6A CN104162630B (en) | 2014-09-05 | 2014-09-05 | A kind of recycling method of casting discarded molding sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410450869.6A CN104162630B (en) | 2014-09-05 | 2014-09-05 | A kind of recycling method of casting discarded molding sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104162630A CN104162630A (en) | 2014-11-26 |
| CN104162630B true CN104162630B (en) | 2017-03-15 |
Family
ID=51906722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410450869.6A Expired - Fee Related CN104162630B (en) | 2014-09-05 | 2014-09-05 | A kind of recycling method of casting discarded molding sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104162630B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858362B (en) * | 2015-04-30 | 2019-05-24 | 北京仁创科技集团有限公司 | A kind of regeneration technology of cast used sand |
| CN106180544A (en) * | 2016-08-15 | 2016-12-07 | 合肥江淮铸造有限责任公司 | A kind of type sand processing technique |
| CN106378415A (en) * | 2016-08-29 | 2017-02-08 | 山西永益铸管股份有限公司 | Pipe casting waste sand recovery method |
| CN107020349A (en) * | 2017-05-26 | 2017-08-08 | 康硕电气集团有限公司 | A kind of sand mold 3D printing old sand processing unit and method |
| CN107414021A (en) * | 2017-08-12 | 2017-12-01 | 合肥市田源精铸有限公司 | A kind of method that cast used sand prepares regenerated foundry sand |
| CN107812881A (en) * | 2017-10-30 | 2018-03-20 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand renovation process and inorganic reclaimed sand |
| CN108941448B (en) * | 2018-08-14 | 2020-06-02 | 南阳仁创砂业科技有限公司 | Method for regenerating used ceramsite sand, regenerated ceramsite sand and product thereof |
| CN108723289A (en) * | 2018-08-20 | 2018-11-02 | 青岛百川通达机械有限公司 | A kind of hot method demoulding regenerating furnace, which unloads to shake out, continues to keep the temperature after baking gradually cooling device |
| CN109967693B (en) * | 2019-05-06 | 2020-09-01 | 北京仁创砂业铸造材料有限公司 | Additive for removing inert film of used casting sand and method for removing inert film of used casting sand |
| CN110125329B (en) * | 2019-05-31 | 2020-08-04 | 南阳仁创砂业科技有限公司 | Regeneration method of used sodium silicate sand |
| CN110252939A (en) * | 2019-06-03 | 2019-09-20 | 启东宇杰雕塑有限公司 | A kind of sand mold mould regenerating resin sand and its preparation process |
| CN110744006A (en) * | 2019-12-02 | 2020-02-04 | 南阳仁创再生资源有限公司 | Reclaimed sand for steel casting and preparation method thereof |
| CN112077260A (en) * | 2020-09-08 | 2020-12-15 | 重庆长江造型材料常州有限公司 | Acid consumption value controllable green sand regeneration and recycling process |
| CN111957886A (en) * | 2020-09-08 | 2020-11-20 | 重庆长江造型材料常州有限公司 | Comprehensive regeneration and reuse process based on casting waste molding sand |
| CN114192768B (en) * | 2021-12-15 | 2022-07-19 | 广州市荣泽模具有限公司 | Intelligent production line for lost foam casting |
| CN115533022B (en) * | 2022-12-05 | 2023-03-14 | 承德北雁新材料科技有限公司 | Regeneration method of foundry clay mixed used sand containing resin organic binder |
| CN116727600B (en) * | 2023-06-16 | 2024-01-26 | 广东万嘉精铸材料有限公司 | Precision casting surface sand powder and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56144842A (en) * | 1980-04-14 | 1981-11-11 | Sanki Eng Co Ltd | Method and equipment for regeneration of heat recovery type casting waste sand |
| JP2003094146A (en) * | 2001-09-25 | 2003-04-02 | Sintokogio Ltd | Recycling method for molding sand for casting mold |
| CN2605941Y (en) * | 2003-03-21 | 2004-03-10 | 汤礼彬 | Furnace for sintering cast resin sands for regeneration |
| CN101439389A (en) * | 2007-11-19 | 2009-05-27 | 上海重型机器冶铸厂 | Method for molding cast steel, method for recycling and regenerating fresh sand and mould sand, and reclaimed sand |
| CN102873268B (en) * | 2012-09-25 | 2015-04-22 | 马鞍山市晨光高耐磨科技发展有限公司 | Foundry self-hardening sand recycling system process |
| CN103317084B (en) * | 2013-06-28 | 2015-08-26 | 常州市维益科技有限公司 | A kind of method using antiquated sand recycling equipment to manufacture precoated sand |
-
2014
- 2014-09-05 CN CN201410450869.6A patent/CN104162630B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN104162630A (en) | 2014-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104162630B (en) | A kind of recycling method of casting discarded molding sand | |
| CN105081213B (en) | Precoated sand recycles production technology | |
| CN110421113A (en) | A kind of ceramsite sand prepared by regenerating used waste and the precoated sand prepared by the ceramsite sand | |
| CN107176845A (en) | A kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick | |
| CN107098577A (en) | A kind of method and system for processing red mud | |
| CN109266848A (en) | Prepare the binder of oxidation of chromite pelletizing | |
| KR101179883B1 (en) | Manufacture method and apparatus for casting sand | |
| CN104841851A (en) | Environment-friendly energy-saving sand and production method thereof | |
| CN106048238A (en) | Recycling technology of casting waste | |
| CN104841858A (en) | Molding sand for improving surface quality of cast part and preparation method thereof | |
| CN111848187A (en) | Method for preparing iron ladle castable by using high-carbon ferrochrome slag | |
| CN101638703B (en) | Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln | |
| CN109079095B (en) | Anti-shelling easily-filled casting molding sand | |
| CN104651554B (en) | A kind of steel slag cracking granulating method | |
| CN105908217A (en) | Method for using waste cathode carbon block of aluminum cell for manufacturing side carbon block | |
| CN109180153A (en) | A method of with oxidation rotary kiln tailings potting grain | |
| CN104841854A (en) | Low-thermal-expansion molding sand and preparation method thereof | |
| CN104745802A (en) | Process for magnetizing roasting of tunnel kiln of iron ores with particle sizes of 15mm or less than 15mm | |
| CN108326230B (en) | Used sand regeneration process | |
| CN104841853A (en) | Fast-radiating easy-to-collapse casting sand and preparation method thereof | |
| CN105603179A (en) | Process for granulating, shaping and sintering phosphate powder | |
| CN111842404A (en) | Low-nitrogen slag treatment method | |
| CN104841874A (en) | Moulding sand for middle-large size castings and preparation method thereof | |
| CN110125320A (en) | A kind of inorganic precipitator dust reclaim method and its application of waterglass | |
| CN108545744A (en) | A kind of preparation method and equipment for refining the thick silicon of industry using organosilicon slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170315 Termination date: 20210905 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |