CN103042161A - Quartz sand contained moulding sand and preparation method thereof - Google Patents

Quartz sand contained moulding sand and preparation method thereof Download PDF

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Publication number
CN103042161A
CN103042161A CN2012105692391A CN201210569239A CN103042161A CN 103042161 A CN103042161 A CN 103042161A CN 2012105692391 A CN2012105692391 A CN 2012105692391A CN 201210569239 A CN201210569239 A CN 201210569239A CN 103042161 A CN103042161 A CN 103042161A
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Prior art keywords
sand
parts
water
quartz sand
mix
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CN2012105692391A
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CN103042161B (en
Inventor
张立安
魏明军
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WANXIN CASTING CO Ltd MAANSHAN CITY
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WANXIN CASTING CO Ltd MAANSHAN CITY
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Abstract

The invention discloses a quartz sand contained moulding sand which comprises the following raw materials in part by weight: 80-90 parts of quartz sand, 5-6 parts of smectite, 2-4 parts of Bentonite, 1-2 parts of coal tar, 1-2 parts of urea, 1-2 parts of calcium formate, 0.6-0.8 parts of mixed material and 3-10 parts of water. The moulding sand can improve the demoulding property of a sand mold, reduces the sensitivity to moisture during pouring, and meanwhile can greatly improve the defects of the cast, such as sand adhering, sand inclusion, sand blasting and air hole appearance so as to further improve the cast finish degree. During the production of moulding sand, as a pre-mixing method is adopted, the situations that the mixed materials and the Bentonite form small sticky balls when meeting water and can not be uniformly distributed on the surface of the moulding sand, and mall blocks are formed in the moulding sand, and the performance of the moulding sand is affected are avoided.

Description

A kind of molding sand that contains quartz sand and preparation method thereof
Technical field
The present invention relates generally to a kind of molding sand, relates in particular to a kind of molding sand that contains quartz sand and preparation method thereof.
Background technology
In casting, be used for the material of moulding.Molding sand is generally mixed according to a certain percentage by Modeling Materials such as Foundry sand, moulding sand binder and additional things.The effect of molding sand in Foundry Production is very important, and the casting wasted product that causes because of the poor quality of molding sand accounts for 30~50% of the total waste product of foundry goods.Usually to the requirement of molding sand be: 1, have higher intensity and heat endurance, to bear the effect of various external force and high temperature.2, good flowability, namely molding sand is in the ability that mutually moves between sand grains under external force or the Action of Gravity Field own.3, certain plasticity, namely molding sand is out of shape under external force, can keep the ability of the shape that gives after external force is removed.4, gas permeability preferably, namely the molding sand hole sees through the ability of gas.5, high collapsibility weighs up again grittiness, and namely whether molding sand destroys easily behind casting solidification, the performance of whether removing from foundry goods easily.
Summary of the invention
The object of the invention is exactly in order to remedy the defective of prior art, a kind of molding sand that contains quartz sand and preparation method thereof to be provided.
The present invention is achieved by the following technical solutions:
A kind of molding sand that contains quartz sand, it is comprised of the raw material of following weight parts:
Quartz sand 80-90, montmorillonite 5-6, bentonite 2-4, coal tar 1-2, urea 1-2, calcium formate 1-2, batch mixing 0.6-0.8, water 3-10;
Described batch mixing is comprised of the raw material of following weight parts:
Flyash 32-40, kaolin 18-20, starch 10-12, calcium carbonate 6-8, calcium chloride 3-5, saponite 2-3, sodium carbonate 2-3, coal dust 1-2, sodium phosphate trimer 0.6-0.8;
Flyash, calcium carbonate and the kaolin of above-mentioned weight portion are mixed grinding, cross the 250-280 mesh sieve;
Then mix with the sodium carbonate of above-mentioned weight portion, 750-800 ℃ of lower calcining 30-40 minute;
Grind after taking out, cross the 200-250 mesh sieve;
Powder after sieving is joined in the powder weight 8-10 sulfuric acid solution doubly mix and blend 0.5-1 hour;
Be heating 1-2 hour in 90-100 ℃ the water-bath with the material after stirring in temperature;
After the product taking-up, add water or sulfuric acid, regulate PH to 2-3;
Put into again thermostatic drying chamber, at 100-120 ℃ of lower freeze-day with constant temperature 0.5-1 hour;
With dried material and each raw material mixed grinding of residue, cross the 200-250 mesh sieve, namely get described batch mixing;
The concentration of described sulfuric acid is 60-70%.
A kind of preparation method who contains the molding sand of quartz sand may further comprise the steps:
(1) quartz sand, the montmorillonite with above-mentioned weight portion mixes grinding, crosses the 150-250 mesh sieve;
(2) water of the above-mentioned weight portion 60-70% of adding in the quartz sand after sieving and the montmorillonite, premixed 40-50s;
(3) add again bentonite, coal tar, urea, calcium formate, the batch mixing of above-mentioned weight portion, mix and blend 20-30s;
(4) add again at last remaining water, mix 60-80s, namely get described molding sand.Advantage of the present invention is:
The foundry goods gas forming amount that adopts this molding sand to produce is little, drying time weak point, good permeability, baked tensile strength height, and can improve the release property of sand mold, when reducing cast to the sensitiveness of moisture, simultaneously the defectives such as the scab of foundry goods, burning into sand, sand washing, pore are had significantly and improve, can make foundry goods further improve fineness, in the production process of this molding sand, by premixed method, can avoid batch mixing and bentonite to meet water and form little sticking group, can't be dispersed in the molding sand surface, condense into little agglomerate in the inside of molding sand, affect moulding-sand property.
The specific embodiment
Embodiment 1
A kind of molding sand that contains quartz sand, it is comprised of the raw material of following weight parts (kilogram):
Quartz sand 90, montmorillonite 6, bentonite 4, coal tar 2, urea 2, calcium formate 1, batch mixing 0.8, water 10;
Described batch mixing is comprised of the raw material of following weight parts:
Flyash 40, kaolin 20, starch 12, calcium carbonate 6-8, calcium chloride 5, saponite 3, sodium carbonate 3, coal dust 2, sodium phosphate trimer 0.8;
Flyash, calcium carbonate and the kaolin of above-mentioned weight portion are mixed grinding, cross 280 mesh sieves;
Then mix with the sodium carbonate of above-mentioned weight portion, 800 ℃ of lower calcinings 40 minutes;
Grind after taking out, cross 250 mesh sieves;
Powder after sieving is joined in the sulfuric acid solution of 10 times of powder weight mix and blend 0.5 hour;
Be heating 2 hours in 100 ℃ the water-bath with the material after stirring in temperature;
After the product taking-up, add water or sulfuric acid, regulate PH to 3;
Put into again thermostatic drying chamber, 100-120 ℃ of lower freeze-day with constant temperature 0.5 hour;
With dried material and each raw material mixed grinding of residue, cross 250 mesh sieves, namely get described batch mixing;
The concentration of described sulfuric acid is 70%.
A kind of preparation method who contains the molding sand of quartz sand may further comprise the steps:
(1) quartz sand, the montmorillonite with above-mentioned weight portion mixes grinding, crosses 250 mesh sieves;
(2) water of the above-mentioned weight portion 70% of adding in the quartz sand after sieving and the montmorillonite, premixed 40s;
(3) add again bentonite, coal tar, urea, calcium formate, the batch mixing of above-mentioned weight portion, mix and blend 30s;
(4) add again at last remaining water, mix 80s, namely get described molding sand.Performance test:
Utilize the technique detection performance of the casting sand of the inventive method production to be:
Green compression strength (MPa): 0.11
Gas permeability 95
Hot green tensile strength (KPa): 525
Shatter index (j): 83%
Compact rate of molding 38%.

Claims (2)

1. molding sand that contains quartz sand is characterized in that what it was comprised of the raw material of following weight parts:
Quartz sand 80-90, montmorillonite 5-6, bentonite 2-4, coal tar 1-2, urea 1-2, calcium formate 1-2, batch mixing 0.6-0.8, water 3-10;
Described batch mixing is comprised of the raw material of following weight parts:
Flyash 32-40, kaolin 18-20, starch 10-12, calcium carbonate 6-8, calcium chloride 3-5, saponite 2-3, sodium carbonate 2-3, coal dust 1-2, sodium phosphate trimer 0.6-0.8;
Flyash, calcium carbonate and the kaolin of above-mentioned weight portion are mixed grinding, cross the 250-280 mesh sieve;
Then mix with the sodium carbonate of above-mentioned weight portion, 750-800 ℃ of lower calcining 30-40 minute;
Grind after taking out, cross the 200-250 mesh sieve;
Powder after sieving is joined in the powder weight 8-10 sulfuric acid solution doubly mix and blend 0.5-1 hour;
Be heating 1-2 hour in 90-100 ℃ the water-bath with the material after stirring in temperature;
After the product taking-up, add water or sulfuric acid, regulate PH to 2-3;
Put into again thermostatic drying chamber, at 100-120 ℃ of lower freeze-day with constant temperature 0.5-1 hour;
With dried material and each raw material mixed grinding of residue, cross the 200-250 mesh sieve, namely get described batch mixing;
The concentration of described sulfuric acid is 60-70%.
2. preparation method who contains the molding sand of quartz sand as claimed in claim 1 is characterized in that may further comprise the steps:
(1) quartz sand, the montmorillonite with above-mentioned weight portion mixes grinding, crosses the 150-250 mesh sieve;
(2) water of the above-mentioned weight portion 60-70% of adding in the quartz sand after sieving and the montmorillonite, premixed 40-50s;
(3) add again bentonite, coal tar, urea, calcium formate, the batch mixing of above-mentioned weight portion, mix and blend 20-30s;
(4) add again at last remaining water, mix 60-80s, namely get described molding sand.
CN201210569239.1A 2012-12-25 2012-12-25 A kind of molding sand containing quartz sand and preparation method thereof Active CN103042161B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495697A (en) * 2013-10-16 2014-01-08 合肥市田源精铸有限公司 Anti-adhesive saw-dust molding sand and preparation method thereof
CN103521678A (en) * 2013-10-16 2014-01-22 合肥市田源精铸有限公司 Molding sand capable of increasing brightness of castings and preparation method thereof
CN103521688A (en) * 2013-10-16 2014-01-22 合肥市田源精铸有限公司 Molding sand casted by potassium feldspar and preparation method thereof
CN104668440A (en) * 2015-02-04 2015-06-03 繁昌县金科机电科技有限公司 Environment-friendly casting coated sand and method for preparing the coated sand
CN106001391A (en) * 2016-07-29 2016-10-12 无锡市三峰仪器设备有限公司 Foundry sand with high air permeability
CN107649642A (en) * 2017-10-27 2018-02-02 湖州正德轻工机械有限公司 A kind of inexpensive molding sand
CN109158525A (en) * 2018-10-19 2019-01-08 含山县兴达球墨铸铁厂 A kind of moulding sand for casting formula

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101376161B (en) * 2008-09-28 2010-08-11 上海应用技术学院 Use method of modified bentonite by lithiation in casting wet type clay sand
EP2308614A1 (en) * 2009-06-05 2011-04-13 Deutsches Zentrum für Luft- und Raumfahrt e.V. Green aerosand
CN102380575A (en) * 2011-11-03 2012-03-21 铜陵和武机械制造有限责任公司 Resin casting molding sand and preparation method thereof
CN102380576A (en) * 2011-11-03 2012-03-21 铜陵和武机械制造有限责任公司 Mixed casting molding sand and preparation method thereof
CN102814460A (en) * 2012-08-20 2012-12-12 合肥江淮铸造有限责任公司 Casting molding sand and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101376161B (en) * 2008-09-28 2010-08-11 上海应用技术学院 Use method of modified bentonite by lithiation in casting wet type clay sand
EP2308614A1 (en) * 2009-06-05 2011-04-13 Deutsches Zentrum für Luft- und Raumfahrt e.V. Green aerosand
CN102380575A (en) * 2011-11-03 2012-03-21 铜陵和武机械制造有限责任公司 Resin casting molding sand and preparation method thereof
CN102380576A (en) * 2011-11-03 2012-03-21 铜陵和武机械制造有限责任公司 Mixed casting molding sand and preparation method thereof
CN102814460A (en) * 2012-08-20 2012-12-12 合肥江淮铸造有限责任公司 Casting molding sand and preparation method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495697A (en) * 2013-10-16 2014-01-08 合肥市田源精铸有限公司 Anti-adhesive saw-dust molding sand and preparation method thereof
CN103521678A (en) * 2013-10-16 2014-01-22 合肥市田源精铸有限公司 Molding sand capable of increasing brightness of castings and preparation method thereof
CN103521688A (en) * 2013-10-16 2014-01-22 合肥市田源精铸有限公司 Molding sand casted by potassium feldspar and preparation method thereof
CN104668440A (en) * 2015-02-04 2015-06-03 繁昌县金科机电科技有限公司 Environment-friendly casting coated sand and method for preparing the coated sand
CN106001391A (en) * 2016-07-29 2016-10-12 无锡市三峰仪器设备有限公司 Foundry sand with high air permeability
CN107649642A (en) * 2017-10-27 2018-02-02 湖州正德轻工机械有限公司 A kind of inexpensive molding sand
CN109158525A (en) * 2018-10-19 2019-01-08 含山县兴达球墨铸铁厂 A kind of moulding sand for casting formula

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