CN109093063A - A kind of precoated sand regeneration method - Google Patents
A kind of precoated sand regeneration method Download PDFInfo
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- CN109093063A CN109093063A CN201810994844.0A CN201810994844A CN109093063A CN 109093063 A CN109093063 A CN 109093063A CN 201810994844 A CN201810994844 A CN 201810994844A CN 109093063 A CN109093063 A CN 109093063A
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- Prior art keywords
- sand
- reclaimed
- vibration
- dust
- thermal reclamation
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Classifications
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- 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
- B22C5/04—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
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention belongs to precoated sand production fields, more particularly to a kind of precoated sand regeneration method, method is combined using thermal reclamation plus mechanical regeneration, including belt-type magnetic separation, swing crushing screening, spiral magnetic separation, the micro- vibration sieve of thermal reclamation, electromagnetism be husky, stirring mulling, the present invention passes through roasting and mechanical regeneration collective effect, the antiquated sand rate of recovery is 85% or more, it first passes through thermophilic roasting and removes the resin layer of sand grain surface and the charcoal point in antiquated sand, the inertia clay layer for removing sand grain surface by Mechanical Method through centrifugation impact again, so that antiquated sand is lived again.
Description
Technical field
The invention belongs to precoated sand production fields, and in particular to a kind of precoated sand regeneration method.
Background technique
Precoated sand (coated sand) sand grain surface is covered with the molding sand or core sand of one layer of hard resin film before moulding.
Have two kinds of coating techniques of cold process and thermal method: cold process is dissolved resin with ethyl alcohol, and methenamine is added during mulling, makes two
Person is coated on sand grain surface, and ethyl alcohol volatilization obtains precoated sand;Sand is preheating to certain temperature by thermal method, and resin is added to make its melting, stirring
So that resin is coated on sand grain surface, adds methenamine aqueous solution and lubricant, it is cooling, broken, sieve to obtain precoated sand.
Reclaimed sand (reclaimed sand), substantially having restored service performance by processing in Foundry Production can return
Old sand.When sand casting, 1 ton of casting of every production will generate 1~7 ton of used old sand.The utilization of old sand substantially has
Reuse after two ways, i.e. reclamation of return sand and regenerating used.Casting mold is after casting, if the binder in most of molding sand does not have
Have and irreversible variation occurs, as long as then removing impurity, ash is cooling and be blended again can the original property of recovery-type sand by inhaling
Can, this processing mode is known as reclamation of return sand, and the molding sand of general only clay bonding could reuse.The sand chemically hardened
Type and type core (such as sand mold and type core made of oil-sand, water-glass sand and various resin sands), the sclerous reaction of binder is
It is irreversible, old sand in this case cannot simply reuse, need the failed adhensive membrane removing of sand grain surface to make
Its performance for substantially restoring roughing sand, this processing mode are known as regenerating used.Close to the molding sand of cast(ing) surface in clay sand mold,
Clay becomes dead clay after high temperature action, cannot restore cementitiousness again.Such clay-bonded sand also must be through regeneration treatment
It can reuse.
There are production method energy consumptions for existing reclaimed sand greatly, and cost of equipment is high, and reclaimed sand is second-rate, and antiquated sand cannot be thorough
Realize regeneration.
Summary of the invention
Defect based on the prior art, the object of the present invention is to provide a kind of regeneration of the precoated sand of precoated sand favorable regeneration effect
Method.
In order to achieve the above object, it the invention adopts the following technical scheme: a kind of precoated sand regeneration method, including walks as follows
It is rapid:
1) antiquated sand is passed through into belt type magnetic separator, the iron block in antiquated sand is filtered out, while antiquated sand is transmitted to swing crushing
At screening machine;
2) coarse sand in step 1) after crushing and screening after machine vibration crushing and screening, take out through the first dust-precipitator d1 by fine grained therein
It walks;
3) the second fine grained in step 2 enters spiral magnetic separator, into the fine grained of spiral magnetic separator, by again
After magnetic separation, thin iron particle is removed, and obtains intermediate sand;
4) the intermediate sand in step 3) enters the sand inlet that vertical elevator g is thus lifted to thermal reclamation sand equipment, and intermediate sand exists
It is uniformly let go in thermal reclamation sand equipment, under 600 DEG C of high temperature, heats 5min, and be heated evenly, obtain reclaimed sand, this
When thermal reclamation sand temperature control between 395 DEG C -575 DEG C;
5) ultra-fine grain generated in thermal reclamation sand equipment in step 4) and flue dust are taken away by third dust-precipitator d3；
6) reclaimed sand in step 4) enters in the micro- vibration sand sieving machine of electromagnetism, and thermal reclamation sand temperature control at this time is at 400 DEG C -550
Between DEG C, in the micro- vibration sand sieving machine of electromagnetism, frequency 13.5HZ, amplitude 9mm, time of vibration 30min obtain reclaimed sand；
7) reclaimed sand in step 6 is obtained into reclaimed sand after supercooling；
8) reclaimed sand in step 7) is stirred and is added resin by stirring sand mixer, reclaimed sand temperature control at this time is 100
Between DEG C -120 DEG C,
9) resin is melted by the reclaimed sand in step 8) using the waste heat of the micro- vibration sand sieving machine of electromagnetism, is covered after then cooling down again
Film sand；
10) ultra-fine grain in the reclaimed sand in step 9) is taken away by the 4th dust-precipitator.
The present invention is first passed through thermophilic roasting and removed by roasting and mechanical regeneration collective effect, the antiquated sand rate of recovery 85% or more
The charcoal point in the resin layer and antiquated sand of sand grain surface is removed, then removes the inertia clay of sand grain surface by Mechanical Method through centrifugation impact
Layer, so that antiquated sand is lived again.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon.
Fig. 1 is flow diagram of the present invention.
Specific embodiment
The present invention is described in further details below by embodiment, embodiment is only used to illustrate the present invention, and unlimited
The scope of the present invention processed.
Embodiment 1: a kind of precoated sand regeneration method includes the following steps:
1) antiquated sand a is passed through into belt type magnetic separator b, the iron block in antiquated sand is filtered out, while antiquated sand is transmitted to vibration and is broken
At broken screening machine c, belt type magnetic separator is selected herein, because belt transmission is limited smaller by height is far and near, belt-type can be more
Good adaptation coarse fodder transmission；
2) coarse sand in step 1) after crushing and screening machine c swing crushing screening after, fine grained therein is taken out through the first dust-precipitator d1
It walks.Coarse granule is sized out, and it is broken to come back to circulation at vibrating crushing screening machine c；
3) the second fine grained in step 2 enters spiral magnetic separator e, into the fine grained of spiral magnetic separator e, by again
After secondary magnetic separation, thin iron particle is removed, and obtains intermediate sand f, selects spiral magnetic separator e herein, the first spun yarn particle is compared with second
Spun yarn particle is thinner, and fineness can carry out screening examination by dust-precipitator d, and spiral magnetic separator e selection is closed herein
The spiral magnetic separator e of conveying, can reduce fugitive dust, and the ultra-fine grain come out from spiral magnetic separator e is taken away by the second dust-precipitator d2；
4) the intermediate sand f in step 3) enters the sand inlet that vertical elevator g is thus lifted to thermal reclamation sand equipment h, intermediate sand f
It is uniformly let go in thermal reclamation sand equipment h, under 600 DEG C of high temperature, heats 5min, and be heated evenly, obtain reclaimed sand
A1, between 395 DEG C, thermal reclamation sand equipment utilization heat exchanger, which improves, enters sky in furnace for thermal reclamation sand temperature control at this time
The temperature of gas makes the carbon residue substance in precoated sand more effectively burn in the air of high-temperature heating, and the generated combustion heat is also
As roasting heat source.Precoated sand flows for a long time in caloric value parallel operation, and the carbon residue substance not being calcined in precoated sand continues
Burning, the combustion heat is absorbed by heat exchanger, to again save the energy.Carbon residue substance in precoated sand burns nearly in roasting
To the greatest extent;
5) ultra-fine grain generated in thermal reclamation sand equipment h in step 4) and flue dust are taken away by third dust-precipitator d3；
6) the reclaimed sand A1 in step 4) enters in the micro- vibration sand sieving machine i of electromagnetism, and thermal reclamation sand temperature control at this time is at 400 DEG C DEG C
Between, in the micro- vibration sand sieving machine i of electromagnetism, frequency 13.5HZ, amplitude 9mm, time of vibration 30min obtain reclaimed sand A2；
7) the reclaimed sand A2 in step 6 is obtained into reclaimed sand A3 after supercooling j；
8) the reclaimed sand A3 in step 7) is stirred and is added resin by stirring sand mixer k, reclaimed sand A3 temperature controls at this time
Between 100 DEG C DEG C;
9) resin is melted by the reclaimed sand A3 in step 8) using the waste heat of the micro- vibration sand sieving machine i of electromagnetism, wraps up resin again
On roughing sand surface layer, precoated sand A4 is obtained after then cooling down L again；
10) ultra-fine grain in the reclaimed sand A3 in step 9) is taken away by the 4th dust-precipitator d4.
The specifications and models of dust-precipitator d1, d2, d3, d4 are as follows: FMQD64-6.
Embodiment 1: a kind of precoated sand regeneration method includes the following steps:
1) antiquated sand a is passed through into belt type magnetic separator b, the iron block in antiquated sand is filtered out, while antiquated sand is transmitted to vibration and is broken
At broken screening machine c, belt type magnetic separator is selected herein, because belt transmission is limited smaller by height is far and near, belt-type can be more
Good adaptation coarse fodder transmission；
2) coarse sand in step 1) after crushing and screening machine c swing crushing screening after, fine grained therein is taken out through the first dust-precipitator d1
It walks.Coarse granule is sized out, and it is broken to come back to circulation at vibrating crushing screening machine c；
3) the second fine grained in step 2 enters spiral magnetic separator e, into the fine grained of spiral magnetic separator e, by again
After secondary magnetic separation, thin iron particle is removed, and obtains intermediate sand f, selects spiral magnetic separator e herein, the first spun yarn particle is compared with second
Spun yarn particle is thinner, and fineness can carry out screening examination by dust-precipitator d, and spiral magnetic separator e selection is closed herein
The spiral magnetic separator e of conveying, can reduce fugitive dust, and the ultra-fine grain come out from spiral magnetic separator e is taken away by the second dust-precipitator d2；
4) the intermediate sand f in step 3) enters the sand inlet that vertical elevator g is thus lifted to thermal reclamation sand equipment h, intermediate sand f
It is uniformly let go in thermal reclamation sand equipment h, under 600 DEG C of high temperature, heats 5min, and be heated evenly, obtain reclaimed sand
A1, between 530 DEG C, thermal reclamation sand equipment utilization heat exchanger, which improves, enters sky in furnace for thermal reclamation sand temperature control at this time
The temperature of gas makes the carbon residue substance in precoated sand more effectively burn in the air of high-temperature heating, and the generated combustion heat is also
As roasting heat source.Precoated sand flows for a long time in caloric value parallel operation, and the carbon residue substance not being calcined in precoated sand continues
Burning, the combustion heat is absorbed by heat exchanger, to again save the energy.Carbon residue substance in precoated sand burns nearly in roasting
To the greatest extent.
5) ultra-fine grain generated in thermal reclamation sand equipment h in step 4) and flue dust are taken out by third dust-precipitator d3
It walks；
6) the reclaimed sand A1 in step 4) enters in the micro- vibration sand sieving machine i of electromagnetism, at this time thermal reclamation sand temperature control 500 DEG C it
Between, in the micro- vibration sand sieving machine i of electromagnetism, frequency 13.5HZ, amplitude 9mm, time of vibration 30min obtain reclaimed sand A2；The micro- vibration of electromagnetism
Sand sieving machine i exists, frequency 13.5HZ, amplitude 9mm, and time of vibration 30min, which can reach, well imitates the shaking-sieving of reclaimed sand A1
Fruit;
7) the reclaimed sand A2 in step 6 is obtained into reclaimed sand A3 after supercooling j；
8) the reclaimed sand A3 in step 7) is stirred and is added resin by stirring sand mixer k, reclaimed sand A3 temperature controls at this time
Between 115 DEG C;
9) resin is melted by the reclaimed sand A3 in step 8) using the waste heat of the micro- vibration sand sieving machine i of electromagnetism, wraps up resin again
On roughing sand surface layer, precoated sand A4 is obtained after then cooling down L again；
10) ultra-fine grain in the reclaimed sand A3 in step 9) is taken away by the 4th dust-precipitator d4.
The specifications and models of dust-precipitator d1, d2, d3, d4 are as follows: FMQD64-6.
Embodiment 3: a kind of precoated sand regeneration method includes the following steps:
1) antiquated sand a is passed through into belt type magnetic separator b, the iron block in antiquated sand is filtered out, while antiquated sand is transmitted to vibration and is broken
At broken screening machine c, belt type magnetic separator is selected herein, because belt transmission is limited smaller by height is far and near, belt-type can be more
Good adaptation coarse fodder transmission；
2) coarse sand in step 1) after crushing and screening machine c swing crushing screening after, fine grained therein is taken out through the first dust-precipitator d1
It walks.Coarse granule is sized out, and it is broken to come back to circulation at vibrating crushing screening machine c；
3) the second fine grained in step 2 enters spiral magnetic separator e, into the fine grained of spiral magnetic separator e, by again
After secondary magnetic separation, thin iron particle is removed, and obtains intermediate sand f, selects spiral magnetic separator e herein, the first spun yarn particle is compared with second
Spun yarn particle is thinner, and fineness can carry out screening examination by dust-precipitator d, and spiral magnetic separator e selection is closed herein
The spiral magnetic separator e of conveying, can reduce fugitive dust, and the ultra-fine grain come out from spiral magnetic separator e is taken away by the second dust-precipitator d2；
4) the intermediate sand f in step 3) enters the sand inlet that vertical elevator g is thus lifted to thermal reclamation sand equipment h, intermediate sand f
It is uniformly let go in thermal reclamation sand equipment h, under 600 DEG C of high temperature, heats 5min, and be heated evenly, obtain reclaimed sand
A1, between 575 DEG C, thermal reclamation sand equipment utilization heat exchanger, which improves, enters sky in furnace for thermal reclamation sand temperature control at this time
The temperature of gas makes the carbon residue substance in precoated sand more effectively burn in the air of high-temperature heating, and the generated combustion heat is also
As roasting heat source.Precoated sand flows for a long time in caloric value parallel operation, and the carbon residue substance not being calcined in precoated sand continues
Burning, the combustion heat is absorbed by heat exchanger, to again save the energy.Carbon residue substance in precoated sand burns nearly in roasting
To the greatest extent;
5) ultra-fine grain generated in thermal reclamation sand equipment h in step 4) and flue dust are taken away by third dust-precipitator d3；
6) the reclaimed sand A1 in step 4) enters in the micro- vibration sand sieving machine i of electromagnetism, at this time thermal reclamation sand temperature control 550 DEG C it
Between, in the micro- vibration sand sieving machine i of electromagnetism, frequency 15HZ, amplitude 12mm, time of vibration 35min obtain reclaimed sand A2；
7) the reclaimed sand A2 in step 6 is obtained into reclaimed sand A3 after supercooling j；
8) the reclaimed sand A3 in step 7) is stirred and is added resin by stirring sand mixer k, reclaimed sand A3 temperature controls at this time
Between 100 DEG C -120 DEG C;
9) resin is melted by the reclaimed sand A3 in step 8) using the waste heat of the micro- vibration sand sieving machine i of electromagnetism, wraps up resin again
On roughing sand surface layer, precoated sand A4 is obtained after then cooling down L again；
10) ultra-fine grain in the reclaimed sand A3 in step 9) is taken away by the 4th dust-precipitator d4.
The specifications and models of dust-precipitator d1, d2, d3, d4 are as follows: FMQD64-6.
Claims (1)
1. a kind of precoated sand regeneration method, characterized by the following steps:
1) antiquated sand a is passed through into belt type magnetic separator b, the iron block in antiquated sand is filtered out, while antiquated sand is transmitted to vibration and is broken
At broken screening machine c;
2) coarse sand in step 1) after crushing and screening machine c swing crushing screening after, fine grained therein is taken out through the first dust-precipitator d1
It walks;
3) the second fine grained in step 2 enters spiral magnetic separator e, into the fine grained of spiral magnetic separator e, by again
After secondary magnetic separation, thin iron particle is removed, and obtains intermediate sand f;
4) the intermediate sand f in step 3) enters the sand inlet that vertical elevator g is thus lifted to thermal reclamation sand equipment h, intermediate sand f
It is uniformly let go in thermal reclamation sand equipment h, under 600 DEG C of high temperature, heats 5min, and be heated evenly, obtain reclaimed sand
A1, thermal reclamation sand temperature control at this time is between 395 DEG C -575 DEG C;
5) ultra-fine grain generated in thermal reclamation sand equipment h in step 4) and flue dust are taken away by third dust-precipitator d3；
6) the reclaimed sand A1 in step 4) enters in the micro- vibration sand sieving machine i of electromagnetism, at this time thermal reclamation sand temperature control 400 DEG C-
Between 550 DEG C, in the micro- vibration sand sieving machine i of electromagnetism, frequency 13.5HZ, amplitude 9mm, time of vibration 30min obtain reclaimed sand A2；
7) the reclaimed sand A2 in step 6 is obtained into reclaimed sand A3 after supercooling j；
8) the reclaimed sand A3 in step 7) is stirred and is added resin by stirring sand mixer k, reclaimed sand A3 temperature controls at this time
Between 100 DEG C -120 DEG C;
9) resin is melted by the reclaimed sand A3 in step 8) using the waste heat of the micro- vibration sand sieving machine i of electromagnetism, is obtained after then cooling down L again
To precoated sand A4；
10) ultra-fine grain in the reclaimed sand A3 in step 9) is taken away by the 4th dust-precipitator d4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810994844.0A CN109093063A (en) | 2018-08-29 | 2018-08-29 | A kind of precoated sand regeneration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810994844.0A CN109093063A (en) | 2018-08-29 | 2018-08-29 | A kind of precoated sand regeneration method |
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| CN201810994844.0A Pending CN109093063A (en) | 2018-08-29 | 2018-08-29 | A kind of precoated sand regeneration method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN107649643A (en) * | 2017-09-11 | 2018-02-02 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
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| CN1481951A (en) * | 2003-07-14 | 2004-03-17 | 安徽省宁国市耐磨材料总厂 | Hot process regenerative apparatus for tectorial sand using for casting |
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Application publication date: 20181228 |
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