CN107414021A - A kind of method that cast used sand prepares regenerated foundry sand - Google Patents
A kind of method that cast used sand prepares regenerated foundry sand Download PDFInfo
- Publication number
- CN107414021A CN107414021A CN201710688352.4A CN201710688352A CN107414021A CN 107414021 A CN107414021 A CN 107414021A CN 201710688352 A CN201710688352 A CN 201710688352A CN 107414021 A CN107414021 A CN 107414021A
- Authority
- CN
- China
- Prior art keywords
- sand
- cast used
- regenerated foundry
- used sand
- foundry sand
- 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
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
-
- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- 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
-
- 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
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
Abstract
The invention belongs to molding sand recycling technical field, and in particular to a kind of method that cast used sand prepares regenerated foundry sand, including cast used sand is handled, ultrasonic wave is scattered in ethanol, thermal cycle air-dries dry and heat treatment, prepared by regenerated foundry sand.The present invention has advantages below compared with prior art：By to the cast used sand after magnetic separation and CNT and polyvinyl alcohol in the present invention, organic principle is set to enter inside CNT, it can be removed after high-temperature roasting again, the fresh sand and other dispensings of respective amount are rejoined again, make gained regenerated foundry sand that there is preferable aeration, the degree of packing and plasticity, its fire resistance and deformability are preferable, it is high to detect organic removal rate, further reduce pollution when reusing compared with prior art, energy-conserving and environment-protective technical scheme is improved, suitable for promoting the use of.
Description
Technical field
The invention belongs to molding sand recycling technical field, and in particular to a kind of method that cast used sand prepares regenerated foundry sand.
Background technology
At present, the 80% of total casting is accounted for the casting of molding sand Foundry Production, the Modeling Material of sand casting occupies in production
Critical role, energy resource consumption, the environmental pollution of Foundry Production, and the quality of casting, production efficiency and cost are directly affected, often
Year consumption fresh sand reaches more than 20,000,000 tons, while also to discharge largely discarded sand, discards sand in sand casting process, with
Waterglass mixing bonds and forms a kind of caking thing, wherein adulterating iron tramp, if regeneration treatment can not be carried out to old sand, makes
It reaches the recycling close to roughing sand quality, then easily goes out of use, and surrounding environment can not only be caused to have a strong impact on, can also
The wasting of resources is caused, makes fresh sand resource scarcity, has engendered the method that discarded molding sand recycles, such as number of patent application at present
For 201410450869.6, it is proposed that carried by crushing-magnetic selection, calcination process, cooling treatment, the making several steps of finished product molding sand
The quality of high reclaimed sand, reduce discarded pollution, alleviate the infringement of burner hearth and combustion chamber, but after its double roasting, can not
Completely by waterglass adhesive film or organic matter removal, certain residual is had, therefore, although reducing dirt when reusing
Dye, but pollution also be present, it would therefore be desirable to further study the recycling method of molding sand on this basis.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of method that cast used sand prepares regenerated foundry sand.
The present invention is achieved by the following technical solutions：A kind of method that cast used sand prepares regenerated foundry sand, including with
Lower step：
（1）By cast used sand is broken, screened sorting process again after magnetic separation；
（2）By the cast used sand after above-mentioned processing with equivalent to its weight 6.5-8.2% CNTs, 1.4-2.2% polyvinyl alcohol,
The ultrasonic disperse 1.5-2 hours in the ethanol solution that mass concentration is 8-10%, solid-liquid mass ratio 4:1；
（3）Dried under the conditions of circulating air, be heat-treated 3-4 hours under conditions of being then 450-550 DEG C in temperature, mixed
It is standby to close material；
（4）Compound after above-mentioned heat treatment after cooling, dedusting, add fresh sand equivalent to its weight 6-8%, 2-3% it is ripe
Lime, 2-3% bentonite, 1-2% coal dust and 8-12% water, stir in puddle mixer and are blended, obtain regenerated foundry sand.
As further improvement of these options, the CNT is graphitization hydroxyl multi-walled carbon nanotube, length
For 30-50nm.
As further improvement of these options, the circulating air temperature is 65-70 DEG C, and hot blast passes through the speed of material
Spend for 10-15m/s.
As further improvement of these options, the ultrasonic disperse frequency is 53-57kHz, temperature during ultrasonic disperse
Spend for 42-47 DEG C.
As further improvement of these options, the cast used sand derive from for silica/alumina class molding sand,
Any one in silica/magnesia class molding sand, mullite synthesizing sand.
The present invention has advantages below compared with prior art：By to the cast used sand after magnetic separation and carbon nanometer in the present invention
Pipe and polyvinyl alcohol, organic principle is entered inside CNT, then can be removed after high-temperature roasting, then rejoin
The fresh sand of respective amount and other dispensings, make gained regenerated foundry sand that there is preferable aeration, the degree of packing and plasticity, its fire resisting
Property and deformability it is preferable, detection organic removal rate is high, further reduces pollution when reusing compared with prior art, perfect
Energy-conserving and environment-protective technical scheme, suitable for promoting the use of.
Embodiment
Embodiment 1
A kind of method that cast used sand prepares regenerated foundry sand, comprises the following steps：
（1）By cast used sand is broken, screened sorting process again after magnetic separation；
（2）It is dense in quality by the cast used sand after above-mentioned processing and equivalent to its CNT of weight 7.4%, 1.8% polyvinyl alcohol
Spend ultrasonic disperse 1.8 hours in the ethanol solution for 9%, the ultrasonic disperse frequency is 55kHz, and temperature during ultrasonic disperse is
45 DEG C, solid-liquid mass ratio 4:1；
（3）To be dried under the conditions of circulating air, the circulating air temperature is 68 DEG C, and it is 13m/s that hot blast, which passes through the speed of material,
Then it is heat-treated 3.5 hours under conditions of being 480 DEG C in temperature, it is standby obtains compound；
（4）Compound after above-mentioned heat treatment after cooling, dedusting, add the fresh sand equivalent to its weight 7%, 2% white lime,
3% bentonite, 1% coal dust and 10% water, stir and be blended in puddle mixer, obtain regenerated foundry sand.
Cast used sand is from being silica/alumina class molding sand, and regenerated foundry sand aeration reaches 128, and compact rate of molding reaches
To 46%, improved compared to fresh sand aeration and compact rate of molding.
Embodiment 2
A kind of method that cast used sand prepares regenerated foundry sand, comprises the following steps：
（1）By cast used sand is broken, screened sorting process again after magnetic separation；
（2）It is dense in quality by the cast used sand after above-mentioned processing and equivalent to its CNT of weight 6.5%, 2.2% polyvinyl alcohol
Spend ultrasonic disperse 2 hours in the ethanol solution for 8%, the ultrasonic disperse frequency is 53kHz, and temperature during ultrasonic disperse is 42
DEG C, solid-liquid mass ratio 4:1；
（3）To be dried under the conditions of circulating air, the circulating air temperature is 70 DEG C, and it is 10m/s that hot blast, which passes through the speed of material,
Then it is heat-treated 4 hours under conditions of being 450 DEG C in temperature, it is standby obtains compound；
（4）Compound after above-mentioned heat treatment after cooling, dedusting, add the fresh sand equivalent to its weight 6%, 2% white lime,
3% bentonite, 1% coal dust and 8% water, stir and be blended in puddle mixer, obtain regenerated foundry sand.
Cast used sand is from being silica/magnesia class molding sand, and regenerated foundry sand aeration reaches 129, and compact rate of molding reaches
To 44%, improved compared to fresh sand aeration and compact rate of molding.
Embodiment 3
A kind of method that cast used sand prepares regenerated foundry sand, comprises the following steps：
（1）By cast used sand is broken, screened sorting process again after magnetic separation；
（2）It is dense in quality by the cast used sand after above-mentioned processing and equivalent to its CNT of weight 8.2%, 1.4% polyvinyl alcohol
Spend ultrasonic disperse 1.5 hours in the ethanol solution for 10%, the ultrasonic disperse frequency is 57kHz, and temperature during ultrasonic disperse is
47 DEG C, solid-liquid mass ratio 4:1；
（3）To be dried under the conditions of circulating air, the circulating air temperature is 65 DEG C, and it is 15m/s that hot blast, which passes through the speed of material,
Then it is heat-treated 3 hours under conditions of being 550 DEG C in temperature, it is standby obtains compound；
（4）Compound after above-mentioned heat treatment after cooling, dedusting, add the fresh sand equivalent to its weight 8%, 3% white lime,
2% bentonite, 2% coal dust and 12% water, stir and be blended in puddle mixer, obtain regenerated foundry sand.
Cast used sand is from being mullite synthesizing sand, and regenerated foundry sand aeration reaches 131, and compact rate of molding reaches 45%, compares
Fresh sand aeration and compact rate of molding improve.
Control group is set, and technology contents are to silica/alumina in being 201410450869.6 according to number of patent application
Class molding sand old sand carries out respective handling；Blank group is set, it is untreated to silica/alumina class molding sand old sand；To each group phase
Close performance to be detected, testing standard is as follows：
LOI and LOI removal rate gives the burning decrement in JACT test method(s)s S-2 measure molding sand, and LOI represents the organic matter in molding sand
Amount, mould strength are under conditions of 25 DEG C, 55%RH, JACT test method(s) HM-1 are given, with Shimadzu strength-testing machine AD-
Compression strength after 5000 measure mixings 1 day；Test result is as follows：
Table 1
| Group | LOI（wt%） | LOI removal rate（%） | Mould strength（MPa） |
| Embodiment 1 | 0.08 | 83.0 | 3.24 |
| Embodiment 2 | 0.09 | 80.9 | 3.27 |
| Embodiment 3 | 0.08 | 83.1 | 3.26 |
| Control group | 0.16 | 66.1 | 2.35 |
| Blank group | 0.47 | / | 1.28 |
Data can be seen that regenerated foundry sand in the present invention and be further increased on the basis of molding sand basic performance is ensured in table 1
To LOI removal rate, that is, the removal of organic matter is improved, avoid environmental pollution, mould strength improves, and makes suitable for promoting
With.
Claims (5)
1. a kind of method that cast used sand prepares regenerated foundry sand, it is characterised in that comprise the following steps：
（1）By cast used sand is broken, screened sorting process again after magnetic separation；
（2）By the cast used sand after above-mentioned processing with equivalent to its weight 6.5-8.2% CNTs, 1.4-2.2% polyvinyl alcohol,
The ultrasonic disperse 1.5-2 hours in the ethanol solution that mass concentration is 8-10%, solid-liquid mass ratio 4:1；
（3）Dried under the conditions of circulating air, be heat-treated 3-4 hours under conditions of being then 450-550 DEG C in temperature, mixed
It is standby to close material；
（4）Compound after above-mentioned heat treatment after cooling, dedusting, add fresh sand equivalent to its weight 6-8%, 2-3% it is ripe
Lime, 2-3% bentonite, 1-2% coal dust and 8-12% water, stir in puddle mixer and are blended, obtain regenerated foundry sand.
2. the method that a kind of cast used sand as claimed in claim 1 prepares regenerated foundry sand, it is characterised in that the CNT is
Graphitization hydroxyl multi-walled carbon nanotube, length 30-50nm.
3. the method that a kind of cast used sand as claimed in claim 1 prepares regenerated foundry sand, it is characterised in that the cycling hot wind-warm syndrome
Spend for 65-70 DEG C, it is 10-15m/s that hot blast, which passes through the speed of material,.
4. the method that a kind of cast used sand as claimed in claim 1 prepares regenerated foundry sand, it is characterised in that the ultrasonic disperse frequency
Rate is 53-57kHz, and temperature during ultrasonic disperse is 42-47 DEG C.
5. the method that a kind of cast used sand as claimed in claim 1 prepares regenerated foundry sand, it is characterised in that the cast used sand comes
Come from as any one in silica/alumina class molding sand, silica/magnesia class molding sand, mullite synthesizing sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710688352.4A CN107414021A (en) | 2017-08-12 | 2017-08-12 | A kind of method that cast used sand prepares regenerated foundry sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710688352.4A CN107414021A (en) | 2017-08-12 | 2017-08-12 | A kind of method that cast used sand prepares regenerated foundry sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107414021A true CN107414021A (en) | 2017-12-01 |
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ID=60437826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710688352.4A Pending CN107414021A (en) | 2017-08-12 | 2017-08-12 | A kind of method that cast used sand prepares regenerated foundry sand |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156442A (en) * | 2019-04-08 | 2019-08-23 | 启东市聚旺铸造有限公司 | Use the light-weight refractory aggregate and preparation method thereof of model casting antiquated sand |
| CN112275996A (en) * | 2020-10-29 | 2021-01-29 | 盐城仁创砂业科技有限公司 | Regeneration method of sand for large steel casting and high-temperature-resistant precoated sand prepared from regenerated sand |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801561A (en) * | 2007-09-12 | 2010-08-11 | 花王株式会社 | Method for production of regenerated foundry sand |
| CN102015152A (en) * | 2008-04-30 | 2011-04-13 | 花王株式会社 | Method for producing mold |
| CN104162630A (en) * | 2014-09-05 | 2014-11-26 | 甘肃永靖昌盛铸钢有限责任公司 | Method for recycling waste molding sand for casting |
| CN104226889A (en) * | 2014-09-24 | 2014-12-24 | 河南省西峡汽车水泵股份有限公司 | Casting molding sand with regenerated dedusting ash and preparation technology of casting molding sand |
-
2017
- 2017-08-12 CN CN201710688352.4A patent/CN107414021A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801561A (en) * | 2007-09-12 | 2010-08-11 | 花王株式会社 | Method for production of regenerated foundry sand |
| CN102015152A (en) * | 2008-04-30 | 2011-04-13 | 花王株式会社 | Method for producing mold |
| CN104162630A (en) * | 2014-09-05 | 2014-11-26 | 甘肃永靖昌盛铸钢有限责任公司 | Method for recycling waste molding sand for casting |
| CN104226889A (en) * | 2014-09-24 | 2014-12-24 | 河南省西峡汽车水泵股份有限公司 | Casting molding sand with regenerated dedusting ash and preparation technology of casting molding sand |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156442A (en) * | 2019-04-08 | 2019-08-23 | 启东市聚旺铸造有限公司 | Use the light-weight refractory aggregate and preparation method thereof of model casting antiquated sand |
| CN112275996A (en) * | 2020-10-29 | 2021-01-29 | 盐城仁创砂业科技有限公司 | Regeneration method of sand for large steel casting and high-temperature-resistant precoated sand prepared from regenerated sand |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171201 |