CN104162630A - Method for recycling waste molding sand for casting - Google Patents
Method for recycling waste molding sand for casting Download PDFInfo
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- CN104162630A CN104162630A CN201410450869.6A CN201410450869A CN104162630A CN 104162630 A CN104162630 A CN 104162630A CN 201410450869 A CN201410450869 A CN 201410450869A CN 104162630 A CN104162630 A CN 104162630A
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Abstract
The invention aims at disclosing a method for recycling waste molding sand for casting. According to the method, a centrifugal regenerator is used for recycling used sand mainly, 90% of used sand can be recycled and is subjected to crushing, magnetic separation and sieving separation, roasted twice and then cooled, fresh sand, bentonite and water glass are added into the cooled sand, and all the materials are stirred and mixed in a sand blending machine to obtain new modeling sand suitable for casting production. By a manner of combining secondary roasting with low-temperature roasting, reverse-flow waste heat of a heat exchanger in a furnace is adequately utilized, so that the pollution of waste gas is reduced, the quality of regenerated sand is improved, damage to a hearth and a furnace core is alleviated, and the service life of equipment is prolonged. According to the method, the waste molding sand for casting can be recycled, and the amount of recycled waste molding sand accounts for 64% of the total amount of sand consumed by an enterprise in a year.
Description
Technical field
The present invention relates to sand casting industry field, is a kind of recycling method of casting with discarded molding sand specifically.
Background technology
Molding sand is Modeling Material main in Foundry Production in modern age, is the major part of discarded object that casting industry produces.The annual foundry goods of China is more than 2,400 ten thousand tons, and casting to select sand be all the quartz sand of high-quality, whole nation foundry industry application molding sand is produced foundry goods and is accounted for all kinds of casting molds production the more than 80% of foundry goods, need every year to consume fresh sand more than 2,000 ten thousand tons, also to discharge a large amount of discarded sand simultaneously, discarded sand is in sand casting, the one caking thing that mixes bonding with waterglass and form, iron tramp is wherein adulterating, as can not be to the old sand processing of regenerating, the quality that it is reached or approach roughing sand is carried out reuse, may be used as discarded object throws away, must cause severe contamination to surrounding environment like this, therefore, how to make molding sand old sand recycle, this is also the significant problem that foundry enterprise must be faced.
Summary of the invention
In sum, the object of the invention is to a kind of openly recycling method of casting with discarded molding sand, comprise the following steps:
A. crushing-magnetic selection processing
To before roasting, carry out fragmentation, magnetic separation processing with the discarded sand of crossing, in order to separating metal residue and old molding sand, metal residue is along with return scrap is transported to smelting furnace together, husky purity reaches 95%-99%, in process screening sorting process, select the screening of 40-70 object sieve bucket, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be transported to roasting regeneration stove and process.
B. calcination process
The molding sand that a step process is crossed carries out bakes to burn the article through roaster, and temperature is 200-300 DEG C; Putting into the temperature that high-temperature roasting furnace carries out after baking is 600～700 DEG C again, destroys the caking ability of waterglass by heat drying, removes the vitrified bond film of sand grain surface.
In waste molding sand, the burning of carbon residue material needs abundant oxygen, for this reason, be provided with forced air supply equipment, and intelligent control in addition, improve moving air temperature in roaster, can be heated to uniformly 200-300 DEG C of most suitable sintering temperature: 600～700 DEG C of sintering temperatures for the second time, by the organic matter burning-off in discarded sand
Above-mentioned organic matter is mainly sodium metasilicate, potassium silicate.
C. cooling processing
Molding sand after roasting, after supercooling, dedusting, obtains reclaimed sand, is delivered in sand hopper for subsequent use.
D. make finished product molding sand
In reclaimed sand, add again fresh sand, add bentonite; Add again moulding sand additive, in puddle mixer, stir mixed system, obtain being applicable to the finished product molding sand of Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand is:
100 parts of reclaimed sands
Fresh sand 5-10 part
Swelling 0.5-0.7 part
Waterglass 2-4 part.
Its most preferred ratio is:
100 parts of reclaimed sands
6 parts of fresh sands
0.3 part of swelling
3 parts of waterglass.
Advantage of the present invention and beneficial effect thereof:
The mode that the present invention utilizes after baking to combine with low-temperature bake, makes full use of counterflow heat exchanger waste heat in stove, has reduced the pollution of waste gas, improves the quality of reclaimed sand, and the infringement that has alleviated burner hearth and combustion chamber, the extension device life-span.The present invention can make to cast discarded molding sand and be able to recycling, and its yield accounts for annual 64% of the molding sand total amount that consumes of enterprise, is a kind of energy-conserving and environment-protective technical scheme, belongs to recycling economy, and low-carbon (LC) low energy consumption, meets national policy and reusing of energy source project planning.
Detailed description of the invention
The centrifugal regenerating device of main employing that recycles of molding sand reclaims old sand, can reclaim more than 90% old sand, and the return sand by this more than 90% carries out sufficient pretreatment, then adds 5%～10% fresh sand, adds the bentonite of 0.5-0.7%; Add again the waterglass of 2-4%, in puddle mixer, stir mixed system, obtain being applicable to the Novel sand of Foundry Production.
Embodiment 1
Cast the recycling method with discarded molding sand, comprise the following steps:
A. crushing-magnetic selection processing
To before roasting, carry out fragmentation, magnetic separation processing with the discarded sand of crossing, in order to separating metal residue and old molding sand, metal residue is along with return scrap is transported to smelting furnace together, husky purity reaches 95%-99%, in process screening sorting process, select 70 object sieve bucket screenings, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be transported to roasting regeneration stove and process.
B. calcination process
The molding sand that a step process is crossed carries out bakes to burn the article through roaster, and temperature is 200 DEG C; Putting into the temperature that high-temperature roasting furnace carries out after baking is 600 DEG C again, destroys the caking ability of waterglass by heat drying, removes the vitrified bond film of sand grain surface.
C. cooling processing
Molding sand after roasting, after supercooling, dedusting, obtains reclaimed sand, is delivered in sand hopper for subsequent use.
D. make finished product molding sand
In the reclaimed sand that c is not walked to obtain, add fresh sand, add bentonite; Add again moulding sand additive, in puddle mixer, stir mixed system, obtain being applicable to the finished product molding sand of Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand is:
100 parts of reclaimed sands
7 parts of fresh sands
0.5 part of swelling
4 parts of waterglass.
Embodiment 2
Cast the recycling method with discarded molding sand, comprise the following steps:
A. crushing-magnetic selection processing
To before roasting, carry out fragmentation, magnetic separation processing with the discarded sand of crossing, in order to separating metal residue and old molding sand, metal residue is along with return scrap is transported to smelting furnace together, husky purity reaches 95%-99%, in process screening sorting process, select 40 object sieve bucket screenings, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be transported to roasting regeneration stove and process.
B. calcination process
The molding sand that a step process is crossed carries out bakes to burn the article through roaster, and temperature is 300 DEG C; Putting into the temperature that high-temperature roasting furnace carries out after baking is 700 DEG C again, destroys the caking ability of waterglass by heat drying, removes the vitrified bond film of sand grain surface.
C. cooling processing
Molding sand after roasting, after supercooling, dedusting, obtains reclaimed sand, is delivered in sand hopper for subsequent use.
D. make finished product molding sand
In the reclaimed sand that c is not walked to obtain, add fresh sand, add bentonite; Add again moulding sand additive, in puddle mixer, stir mixed system, obtain being applicable to the finished product molding sand of Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand is:
100 parts of reclaimed sands
9 parts of fresh sands
0.7 part of swelling
2 parts of waterglass.
Embodiment 3
Cast the recycling method with discarded molding sand, comprise the following steps:
A. crushing-magnetic selection processing
To before roasting, carry out fragmentation, magnetic separation processing with the discarded sand of crossing, in order to separating metal residue and old molding sand, metal residue is along with return scrap is transported to smelting furnace together, husky purity reaches 95%-99%, in process screening sorting process, select 50 object sieve bucket screenings, disabled sand and callable molding sand separating treatment, the molding sand of recoverable will be transported to roasting regeneration stove and process.
B. calcination process
The molding sand that a step process is crossed carries out bakes to burn the article through roaster, and temperature is 250 DEG C; Putting into the temperature that high-temperature roasting furnace carries out after baking is 650 DEG C again, destroys the caking ability of waterglass by heat drying, removes the vitrified bond film of sand grain surface.
C. cooling processing
Molding sand after roasting, after supercooling, dedusting, obtains reclaimed sand, is delivered in sand hopper for subsequent use.
D. make finished product molding sand
In the reclaimed sand that c is not walked to obtain, add fresh sand, add bentonite; Add again moulding sand additive, in puddle mixer, stir mixed system, obtain being applicable to the finished product molding sand of Foundry Production.
Above-mentioned additive is waterglass.
The adding proportion of above-mentioned finished product molding sand is:
100 parts of reclaimed sands
6 parts of fresh sands
0.6 part of bentonite
3 parts of waterglass.
Claims (4)
1. cast the recycling method with discarded molding sand, comprise the following steps:
A. crushing-magnetic selection processing
To before roasting, carry out fragmentation, magnetic separation processing with the discarded sand of crossing, in order to separating metal residue and old molding sand, metal residue is along with return scrap is transported to smelting furnace together, and husky purity reaches 95%-99%, through screening sorting process, select the screening of 40-70 object sieve bucket again;
B. calcination process
The molding sand that a step process is crossed carries out bakes to burn the article through roaster, and temperature is 200-300 DEG C; Putting into the temperature that high-temperature roasting furnace carries out after baking is 600～700 DEG C again;
C. cooling processing
Molding sand after roasting, after supercooling, dedusting, obtains reclaimed sand, is delivered in sand hopper for subsequent use;
D. make finished product molding sand
In the reclaimed sand that c step is obtained, add fresh sand, bentonite and moulding sand additive, in puddle mixer, stir mixed system, obtain being applicable to the finished product molding sand of Foundry Production.
2. a kind of recycling method of casting with discarded molding sand as claimed in claim 1, is characterized in that: described moulding sand additive is waterglass.
3. a kind of recycling method of casting with discarded molding sand as claimed in claim 1, is characterized in that: the adding proportion of described finished product molding sand is:
100 parts of reclaimed sands
Fresh sand 5-10 part
Swelling 0.5-0.7 part
Waterglass 2-4 part.
4. a kind of recycling method of casting with discarded molding sand as claimed in claim 3, is characterized in that: the most preferred ratio of described finished product molding sand is:
100 parts of reclaimed sands
6 parts of fresh sands
0.3 part of swelling
3 parts of waterglass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410450869.6A CN104162630B (en) | 2014-09-05 | 2014-09-05 | A kind of recycling method of casting discarded molding sand |
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| 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 |
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| CN104162630A true CN104162630A (en) | 2014-11-26 |
| CN104162630B CN104162630B (en) | 2017-03-15 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858362A (en) * | 2015-04-30 | 2015-08-26 | 北京仁创科技集团有限公司 | Regeneration technology of foundry 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 |
| 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 |
| CN108941448A (en) * | 2018-08-14 | 2018-12-07 | 南阳仁创砂业科技有限公司 | Haydite regenerating used method, regeneration ceramsite sand and products thereof |
| CN109967693A (en) * | 2019-05-06 | 2019-07-05 | 北京仁创砂业科技有限公司 | The method for removing the additive of cast used sand inert coating and removing cast used sand inert coating |
| CN110125329A (en) * | 2019-05-31 | 2019-08-16 | 南阳仁创砂业科技有限公司 | A kind of 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 |
| 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 |
| 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 |
| CN114192768A (en) * | 2021-12-15 | 2022-03-18 | 广州市荣泽模具有限公司 | Intelligent production line for lost foam casting |
| CN115533022A (en) * | 2022-12-05 | 2022-12-30 | 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 |
| CN116727600A (en) * | 2023-06-16 | 2023-09-12 | 广东万嘉精铸材料有限公司 | Precision casting surface sand powder and preparation method thereof |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858362A (en) * | 2015-04-30 | 2015-08-26 | 北京仁创科技集团有限公司 | Regeneration technology of foundry used sand |
| 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 |
| CN108941448A (en) * | 2018-08-14 | 2018-12-07 | 南阳仁创砂业科技有限公司 | Haydite regenerating used method, regeneration ceramsite sand and products 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 |
| CN109967693A (en) * | 2019-05-06 | 2019-07-05 | 北京仁创砂业科技有限公司 | The method for removing the additive of cast used sand inert coating and removing cast used sand inert coating |
| CN110125329A (en) * | 2019-05-31 | 2019-08-16 | 南阳仁创砂业科技有限公司 | A kind of regeneration method of used sodium silicate 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 |
| 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 |
| 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 |
| CN114192768A (en) * | 2021-12-15 | 2022-03-18 | 广州市荣泽模具有限公司 | Intelligent production line for lost foam casting |
| CN115533022A (en) * | 2022-12-05 | 2022-12-30 | 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 |
| 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 |
| CN116727600A (en) * | 2023-06-16 | 2023-09-12 | 广东万嘉精铸材料有限公司 | Precision casting surface sand powder and preparation method thereof |
| 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 |
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