CN108339925A - A kind of semi-coke compound powder, the molding sand containing the composition and the application in casting - Google Patents
A kind of semi-coke compound powder, the molding sand containing the composition and the application in casting Download PDFInfo
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- CN108339925A CN108339925A CN201711057736.2A CN201711057736A CN108339925A CN 108339925 A CN108339925 A CN 108339925A CN 201711057736 A CN201711057736 A CN 201711057736A CN 108339925 A CN108339925 A CN 108339925A
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- 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
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Abstract
The present invention relates to a kind of semi-coke compound powder, the molding sand containing the composition and the applications in casting, belong to materialogy field, and in particular to founding materials and casting technique.Composition contains one kind or two kinds of mixture in semi-coke powder, starch or flour.Molding sand is made after return sand, fresh sand, bentonite, semi-coke compound powder are mixed, can be used for casting.It is cast using semi-coke compound powder provided by the invention or molding sand, materials are few at low cost, ash and sulfur content are low, there is no ash content plugs to block up molding sand gap, absorbs the problems such as a large amount of moisture forms bleb or forms sand hole in turn, so that casting quality is promoted, while high degree improves workshop condition while, reduces environmental pollution.
Description
Technical field
The present invention relates to materialogy fields, and in particular to founding materials and casting technique.
Background technology
At present in casting industry cast iron wet type production both at home and abroad, casting coal powder is generally used.The addition root of casting coal powder
Difference, generally 3~8% according to the difference of casting size, alloy material and formative method.But casting coal powder still exists
Some disadvantages, ash and sulfur content are high in coal dust.Ash content, sulphur content in coal dust are harmful substance, and ash content plug blocks up molding sand gap,
And absorb a large amount of moisture.Moisture forms gas phase, anxious strong expansion under molten metal high temperature action, and the gas excessively expanded is difficult to
Enter in molten metal to form bleb or gas and molding sand surface bursts from discharge between sand grains and fall off, forms casting sand
Eye.Coal dust constantly adds in production process, and making ash content, also constantly accumulation increases, and vicious circle makes casting yield degradation.
To solve this critical issue, need to supplement a large amount of fresh sands in molding sand, to increase production cost.And casting coal powder uses process
It is middle to generate a large amount of fine particle (PM2.5、PM10Deng), but be cause foundry's work situation deteriorate the main reason for one of.Separately
Outside, the sulphur content in coal dust enters in molten metal the mechanical performance that will reduce casting.
Invention content
To solve to influence casting yield and casting mechanical performance, while production cost using casting coal powder in above-mentioned casting
The problems such as high, pollution environment, the present invention provide a kind of semi-coke compound powder, the molding sand containing the composition and answering in casting
With.
Above-mentioned semi-coke compound powder contains semi-coke powder, also contains one or both of starch, flour.
Above-mentioned semi-coke powder water content 1 (wt) %-10 (wt) %, granularity are -200 mesh of 180 mesh；Starch granularity is 100-180
Mesh；Flour granularity is 90-150 mesh.
In above-mentioned semi-coke compound powder, as mass fraction, semi-coke powder content is 50-99% to each component, in flour, starch
One or two kinds of total contents be 1-50%.
The preparation method of above-mentioned semi-coke powder is：By semi-coke (also known as semicoke, coke powder) dehydration to water content 1 (wt) %-10
(wt) %, it is -200 mesh of 180 mesh to pulverize and sieve to granularity；Above-mentioned dehydration refers in natural drying or drying tower 100 DEG C -150
DEG C drying.
The preparation method of above-mentioned semi-coke compound powder is：By semi-coke powder, starch and the flour of above-mentioned granularity and mass fraction
In one kind or two kinds be uniformly mixed.
The present invention also provides application of the above-mentioned semi-coke compound powder in casting, specially：(1) sand processed：It prepares containing orchid
The molding sand of charcoal compound powder is spare；(2) moulding：The sand molding obtained using step (1)；(3) it pours into a mould；(4) shake out, sand removal.
The preparation method of above-mentioned steps (1) molding sand is：By return sand, fresh sand, bentonite, semi-coke compound powder according to reuse
95-98 parts of sand, 2-5 parts of fresh sand, 0.33-0.5 parts of bentonite, after the weight ratio that 0.2-0.8 part of semi-coke compound powder is dry-mixed,
The water wet mixing that total weight 2%-5% is added obtains the molding sand containing semi-coke compound powder.The above-mentioned institute in addition to semi-coke compound powder
There is raw material to pulverize and sieve in dry-mixed preceding process, the sieving was 80-150 mesh sieve.
The present invention also provides the molding sand containing above-mentioned semi-coke compound powder, contain return sand, fresh sand, bentonite, semi-coke powder.
Preferably, in above-mentioned molding sand, according to the mass fraction, containing 95-98 parts of return sand, 2-5 parts of fresh sand is swollen for each component
Moisten 0.33-0.5 parts of soil, 0.2-0.8 parts of semi-coke compound powder.
The preparation method of above-mentioned molding sand is：(1) one kind or two kinds of mixture in semi-coke powder, starch or flour are taken, respectively
As mass fraction, one kind or two kinds of mixture total content in starch or flour are 1-50% to component, and semi-coke powder content is
50-99% is uniformly mixed and obtains semi-coke compound powder.(2) by semi-coke powder made from return sand, fresh sand, bentonite, step (1)
Composition is according to 95-98 parts of return sand, 2-5 parts of fresh sand, 0.33-0.5 parts of bentonite, the weight that 0.2-0.8 parts of semi-coke compound powder
After amount part ratio is dry-mixed, the water wet mixing that total weight 2%-5% is added obtains the molding sand containing semi-coke powder.It is above-mentioned to remove semi-coke powder group
It closes all raw materials of beyond the region of objective existence to pulverize and sieve in dry-mixed preceding process, the sieving was 80-150 mesh sieve.
The present invention also provides application of the above-mentioned molding sand in casting, specially：(1) moulding：It is combined using containing semi-coke powder
The sand molding of object；(2) it pours into a mould；(3) shake out, sand removal.
Moulding described herein is the routine operation in casting industry, and the concrete operations of one of which are：Mechanical mulling
Line mulling, knockout are transported to mo(u)lding line, carry out machine moulding, obtain sand mold.
The routine operation described herein being cast in casting industry, the concrete operations of one of which are：Metal or conjunction
Gold melting, molten metal or alloy are poured into cavity, are directed at the cast gate of sprue cup when cast, and pouring temperature is 1000 DEG C-
6000 DEG C (being determined according to specific metal or alloy melting temperature), when cast and bleed, pouring operation time 1min-20min,
It is taken out after molten steel solidification in sprue cup, weight standing time is not less than 1 hour.
Shake out described herein, sand removal are the routine operation in casting industry, and the concrete operations of one of which are：It removes
Fragment on the casting mold of cast, temperature is not higher than 300 DEG C when operation；Removal arbor and core sand, ball blast are polished using abrasive machine,
Overlap, burr, fleshiness and dead head nubbin are ground off to get casting.
Advantageous effect
1, materials are few at low cost, and the addition of casting coal powder is generally 3~8 (wt) %, and semi-coke powder provided by the invention
The addition of composition is less than 0.7 (wt) %.
2, semi-coke compound powder and molding sand provided by the invention, ash and sulfur content are low, i.e., Harmful ingredient content is low.Together
When, there is no ash content plugs to block up molding sand gap, absorb a large amount of moisture and then forms bleb or formation sand hole etc. asks
Topic so that casting quality is promoted.
3, semi-coke compound powder and molding sand provided by the invention generate minute quantity fine particle (PM during use2.5、
PM10Deng), high degree reduces environmental pollution while improving workshop condition.
4, semi-coke compound powder and molding sand provided by the invention, sulfur content is low, greatly improves the mechanical performance of casting.
5, semi-coke compound powder provided by the invention is environment-friendly materials, and preparation process is environmentally friendly and at low cost, substantially reduces casting
This while is caused, is reduced environmental pollution using environment-friendly materials.
6, composition is made in semi-coke powder, be applied in casting so that the technique after cast is easier to make for.
Description of the drawings
Fig. 1 is the environment photo in 3 casting process of embodiment.
Fig. 2 is the environment photo in comparative example casting process.
Fig. 3 is 3 casting photo of embodiment.
Fig. 4 is comparative example casting photo.
Specific implementation mode
Embodiment 1
Prepare semi-coke compound powder：
1, semi-coke powder is prepared：
(1) by semi-coke (also known as semicoke, coke powder) dehydration to water content 1 (wt) %, pulverize and sieve to granularity be 180 mesh i.e.
It can；Above-mentioned dehydration, refers to natural drying.
(2) by semi-coke (also known as semicoke, coke powder) dehydration to water content 10 (wt) %, pulverize and sieve to granularity be 200 mesh i.e.
It can；Above-mentioned dehydration refers to 100 DEG C of drying in drying tower.
(3) by semi-coke (also known as semicoke, coke powder) dehydration to water content 10 (wt) %, pulverize and sieve to granularity be 200 mesh i.e.
It can；Above-mentioned dehydration refers to 150 DEG C of drying in drying tower.
1 in table 1a embodiments 1, (one)-(three) prepare semi-coke powder, the key technical indexes：
| Project | Testing result |
| Ash content | ≤ 15% |
| Volatile matter | ＜ 10% |
| Fixed carbon | ＞ 60% |
| Characteristic of char residue | I grades |
2, semi-coke compound powder is prepared：
The semi-coke powder prepared using the present embodiment 1, (two) prepares semi-coke compound powder：
(1) raw material is：Semi-coke powder water content 10 (wt) %, granularity are 200 mesh；Starch granularity is 180 mesh；Flour granularity
For 150 mesh.
Take above-mentioned each component as mass fraction, content of starch 10%, flour content 40%, semi-coke powder content 50%.
Physical mixed is uniformly mixed up to semi-coke compound powder.
(2) raw material is：Semi-coke powder water content 1 (wt) %, granularity are 180 mesh；Starch granularity is 100 mesh；Flour granularity is
90 mesh.
Take above-mentioned each component as mass fraction, content of starch 0%, flour content 50%, semi-coke powder content 50%.
Physical mixed is uniformly mixed up to semi-coke compound powder.
(3) raw material is：Semi-coke powder water content 10 (wt) %, granularity are 200 mesh；Starch granularity is 180 mesh；Flour granularity
For 150 mesh.
Take above-mentioned each component as mass fraction, content of starch 50%, flour content 0%, semi-coke powder content 50%.
Physical mixed is uniformly mixed up to semi-coke compound powder.
(4) raw material is：Semi-coke powder water content 10 (wt) %, granularity are 200 mesh；Starch granularity is 180 mesh；Flour granularity
For 150 mesh.
Take above-mentioned each component as mass fraction, content of starch 10%, flour content 10%, semi-coke powder content 80%.
Physical mixed is uniformly mixed up to semi-coke compound powder.
2 in table 1b embodiments 1, (one)-(four) prepare semi-coke compound powder, the key technical indexes：
| Project | Testing result |
| Ash content | ＜ 15% |
| Volatile matter | ＜ 15% |
| Fixed carbon | ＞ 65% |
| Characteristic of char residue | I grades |
As can be seen from the above table, all technical of semi-coke compound powder is better than conventional cast coal dust.
Embodiment 2
Prepare the molding sand of the powder containing semi-coke：
The semi-coke compound powder that the present embodiment uses is the semi-coke compound powder that in embodiment 1 prepared by 2, (four).
(1) by return sand, fresh sand, bentonite (flourishing mountain sodium bentonite), semi-coke powder according to 95 parts of return sand, fresh sand 2
Part, after the weight ratio that 0.2 part of semi-coke compound powder is dry-mixed, the water wet mixing of total weight 2% is added in 0.33 part of bentonite to obtain the final product
To the molding sand containing semi-coke powder.By pulverizing and sieving before above-mentioned raw materials all in addition to semi-coke are dry-mixed, the sieving was 80 mesh sieve.
(2) by return sand, fresh sand, bentonite (flourishing mountain sodium bentonite), semi-coke powder according to 95 parts of return sand, fresh sand 2
Part, after the weight ratio that 0.2 part of semi-coke compound powder is dry-mixed, the water wet mixing of total weight 2% is added in 0.33 part of bentonite to obtain the final product
To the molding sand containing semi-coke powder.Above-mentioned raw materials all in addition to semi-coke pulverize and sieve in dry-mixed preceding process, and the sieving was 150 mesh
Sieve.
(3) by return sand, fresh sand, bentonite (flourishing mountain sodium bentonite), semi-coke powder according to 98 parts of return sand, fresh sand 5
Part, after the weight ratio that 0.8 part of semi-coke compound powder is dry-mixed, the water wet mixing of total weight 5% is added in 0.5 part of bentonite to obtain the final product
To the molding sand containing semi-coke powder.By pulverizing and sieving before above-mentioned raw materials all in addition to semi-coke are dry-mixed, the sieving was 150 mesh
Sieve.
(4) by return sand, fresh sand, bentonite (flourishing mountain sodium bentonite), semi-coke powder according to 95 parts of return sand, fresh sand 2
Part, after the weight ratio that 0.8 part of semi-coke compound powder is dry-mixed, the water wet mixing of total weight 3% is added in 0.33 part of bentonite to obtain the final product
To the molding sand containing semi-coke powder.Above-mentioned raw materials all in addition to semi-coke pulverize and sieve in dry-mixed preceding process, and the sieving was 150 mesh
Sieve.
(5) by return sand, fresh sand, bentonite (flourishing mountain sodium bentonite), semi-coke powder according to 98 parts of return sand, fresh sand 5
Part, after the weight ratio that 0.2 part of semi-coke compound powder is dry-mixed, the water wet mixing of total weight 3% is added in 0.5 part of bentonite to obtain the final product
To the molding sand containing semi-coke powder.By pulverizing and sieving before above-mentioned raw materials all in addition to semi-coke are dry-mixed, the sieving was 150 mesh
Sieve.
2 embodiment of table, 2 gained molding sand technical data sheet：
As can be seen from the above table, molding sand all technical obtained is up to standard and is higher than industry average level.
Embodiment 3
Molding sand containing semi-coke compound powder is used for casting：
The molding sand that the present embodiment uses is molding sand prepared by embodiment 2 (five).
Step is：(1) moulding：Utilize the sand molding containing semi-coke compound powder；(2) it pours into a mould；(3) shake out, sand removal.
The concrete operations of the moulding are：Mechanical mulling line mulling, knockout are transported to mo(u)lding line, carry out machine moulding, obtain
To sand mold.
The concrete operations of the cast are：Molten iron is burnt, by molten iron casting to cavity, alignment sprue cup pours when cast
Mouthful, pouring temperature is 1400 DEG C, and when cast and bleed, pouring operation time 7min takes out after the molten steel solidification in sprue cup, presses
1 hour iron standing time.
The shake out, sand removal concrete operations be：The bushel iron block on the casting mold of cast is removed, 290 DEG C of temperature when operation；It goes
Except arbor and core sand, ball blast is polished using abrasive machine, grinds off overlap, burr, fleshiness and dead head nubbin to get casting.
Casting process environment photo is shown in Fig. 1, with Fig. 2 (comparative example-uses coal dust) comparison it is found that using provided by the invention
Semi-coke compound powder and sand conditioning casting influence very little to workshop condition, and environmental pollution is small.Workshop condition air sampling (inspection
Survey project standard is shown in Table 3) testing result and is shown in Table 4, it can be seen that is carried out using semi-coke compound powder provided by the invention and molding sand
Casting, workshop condition air TSP, PM10、PM2.5, sulfur dioxide than comparative example (using coal dust and containing the molding sand of coal dust) have
It is reduced, workshop condition makes moderate progress, and environmental pollution is small, while indirect proof sulfur content is low, bad to the mechanical performance of casting
It influences small.Gained casting photo is as shown in figure 3, with Fig. 4 (comparative example-uses coal dust) comparison it is found that using provided by the invention
Semi-coke compound powder and sand conditioning casting, cast(ing) surface is smooth, and stomata, sand holes are few, and casting quality is promoted.
3 detection project standard of table
4 embodiment 3 of table, comparative example workshop condition air sampling testing result
Embodiment 4
Molding sand containing semi-coke compound powder is used for casting：
The molding sand that the present embodiment uses is molding sand prepared by embodiment 2 (five).
Step is：(1) moulding：Utilize the sand molding containing semi-coke compound powder；(2) it pours into a mould；(3) shake out, sand removal.
The concrete operations of the moulding are：Mechanical mulling line mulling, knockout are transported to mo(u)lding line, carry out machine moulding, obtain
To sand mold.
The concrete operations of the cast are：Molten iron is burnt, by molten iron casting to cavity, alignment sprue cup pours when cast
Mouthful, pouring temperature is 1350 DEG C, and when cast and bleed, pouring operation time 3min takes out after the molten steel solidification in sprue cup, presses
1.5 hours iron standing times.
The shake out, sand removal concrete operations be：The bushel iron block on the casting mold of cast is removed, 250 DEG C of temperature when operation；It goes
Except arbor and core sand, ball blast is polished using abrasive machine, grinds off overlap, burr, fleshiness and dead head nubbin to get casting.
Comparative example
Molding sand is prepared with the step of embodiment 2 (five), difference lies in substitute semi-coke compound powder with casting coal powder.
Using the molding sand of preparation, casting, workshop condition air sampling (detection project standard are prepared with reference to 3 step of embodiment
It is shown in Table 3) testing result and is shown in Table 4, casting process photo is shown in that Fig. 2, gained casting photo are shown in Fig. 4.
Claims (10)
1. a kind of semi-coke compound powder, it is characterised in that：Containing semi-coke powder, also contain one or both of starch, flour.
2. composition according to claim 1, it is characterised in that：Wherein semi-coke powder water content 1 (wt) %-10 (wt) %,
Granularity is -200 mesh of 180 mesh；Starch granularity is 100-180 mesh；Flour granularity is 90-150 mesh.
3. semi-coke compound powder according to claim 1, it is characterised in that：In semi-coke compound powder, each component presses quality
Score meter, semi-coke powder content are 50-99%, and the total content of one or both of flour, starch is 1-50%.
4. a kind of application of any one of claim 1-3 semi-coke compound powders in casting.
5. applying according to claim 4, it is characterised in that：Specially：(1) sand processed：Preparation contains semi-coke compound powder
Molding sand is spare；(2) moulding：The sand molding obtained using step (1)；(3) it pours into a mould；(4) shake out, sand removal.
6. applying according to claim 5, it is characterised in that：The preparation method of step (1) molding sand is：By return sand,
Fresh sand, bentonite, semi-coke compound powder are according to 95-98 parts of return sand, 2-5 parts of fresh sand, 0.33-0.5 parts of bentonite, semi-coke powder group
Close 0.2-0.8 part of object weight ratio it is dry-mixed after, the water wet mixing that total weight 2%-5% is added is obtained containing the combination of semi-coke powder
The molding sand of object；Above-mentioned raw materials all in addition to semi-coke compound powder pulverize and sieve in dry-mixed preceding process, and the sieving was 80-150
Mesh sieves.
7. a kind of molding sand containing any one of the claim 1-3 semi-coke compound powders, it is characterised in that：Containing return sand,
Fresh sand, bentonite, semi-coke powder.
8. the molding sand described in claim 7, it is characterised in that：Preferably, in the molding sand, each component presses mass fraction
Meter, contains 95-98 parts of return sand, 2-5 parts of fresh sand, 0.33-0.5 parts of bentonite, 0.2-0.8 parts of semi-coke compound powder.
9. a kind of application of 7 or 8 molding sand of claim in casting.
10. applying according to claim 9, it is characterised in that：Specially：(1) moulding：Using containing semi-coke compound powder
Sand molding；(2) it pours into a mould；(3) shake out, sand removal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711057736.2A CN108339925A (en) | 2017-11-01 | 2017-11-01 | A kind of semi-coke compound powder, the molding sand containing the composition and the application in casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711057736.2A CN108339925A (en) | 2017-11-01 | 2017-11-01 | A kind of semi-coke compound powder, the molding sand containing the composition and the application in casting |
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| CN114029446A (en) * | 2021-11-11 | 2022-02-11 | 山东旭光得瑞高新材料股份有限公司 | Green-mold casting clay molding sand capable of reducing pollution emission and preparation method thereof |
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