CN103042161B - A kind of molding sand containing quartz sand and preparation method thereof - Google Patents
A kind of molding sand containing quartz sand and preparation method thereof Download PDFInfo
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- CN103042161B CN103042161B CN201210569239.1A CN201210569239A CN103042161B CN 103042161 B CN103042161 B CN 103042161B CN 201210569239 A CN201210569239 A CN 201210569239A CN 103042161 B CN103042161 B CN 103042161B
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Abstract
The invention discloses a kind of molding sand containing quartz sand, it is made up 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, the foundry goods gas forming amount adopting this molding sand to produce is little, drying time is short, good permeability, baked tensile strength is high, and the release property of sand mold can be improved, reduce the sensitiveness to moisture when pouring into a mould, simultaneously to the scab of foundry goods, burning into sand, sand washing, the defects such as pore have to be improved significantly, foundry goods can be made to improve fineness further, in the production process of this molding sand, by the method for premixed, batch mixing and bentonite can be avoided to meet water and to form little sticky group, molding sand surface cannot be dispersed in, little agglomerate is become at the internal condensate of molding sand, affect moulding-sand property.
Description
Technical field
The present invention relates generally to a kind of molding sand, particularly relates to a kind of molding sand containing quartz sand and preparation method thereof.
Background technology
The material of moulding is used in casting.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 caused 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, there is higher intensity and heat endurance, to bear the effect of various external force and high temperature.2, good mobility, i.e. the ability of molding sand mutual movement between sand grains under external force or 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 given after external force is removed.4, good gas permeability, namely molding sand hole is through the ability of gas.5, high collapsibility, whether, also known as knockability, namely after casting solidification, whether molding sand easily destroys, the easy performance removed from foundry goods.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of molding sand containing quartz sand and preparation method thereof.
The present invention is achieved by the following technical solutions:
Containing a molding sand for quartz sand, it is made up 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 made up 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;
The mixing of the flyash of above-mentioned weight portion, calcium carbonate and kaolin is ground, crosses 250-280 mesh sieve;
Then mix with the sodium carbonate of above-mentioned weight portion, at 750-800 DEG C, calcine 30-40 minute;
Grinding after taking out, crosses 200-250 mesh sieve;
Powder after sieving is joined in powder weight 8-10 sulfuric acid solution doubly, mix and blend 0.5-1 hour;
Be heat 1-2 hour in the water-bath of 90-100 DEG C in temperature by the material after stirring;
After product is taken out, add water or sulfuric acid, regulate PH to 2-3;
Put into thermostatic drying chamber again, freeze-day with constant temperature 0.5-1 hour at 100-120 DEG C;
By dried material and each raw material mixed grinding of residue, cross 200-250 mesh sieve, obtain described batch mixing;
The concentration of described sulfuric acid is 60-70%.
Containing a preparation method for the molding sand of quartz sand, comprise the following steps:
(1) quartz sand of above-mentioned weight portion, montmorillonite mixing are ground, cross 150-250 mesh sieve;
(2) water of above-mentioned weight portion 60-70% is added in quartz sand after sizing and montmorillonite, premixed 40-50s;
(3) bentonite, coal tar, urea, calcium formate, the batch mixing of above-mentioned weight portion is added again, mix and blend 20-30s;
(4) finally add remaining water again, mixing 60-80s, obtains described molding sand.Advantage of the present invention is:
The foundry goods gas forming amount adopting this molding sand to produce is little, drying time is short, good permeability, baked tensile strength are high, and the release property of sand mold can be improved, reduce the sensitiveness to moisture when pouring into a mould, have the defect such as scab, burning into sand, sand washing, pore of foundry goods simultaneously and improve significantly, foundry goods can be made to improve fineness further, in the production process of this molding sand, by the method for premixed, batch mixing and bentonite can be avoided to meet water and to form little sticky group, molding sand surface cannot be dispersed in, become little agglomerate at the internal condensate of molding sand, affect moulding-sand property.
Detailed description of the invention
Embodiment 1
Containing a molding sand for quartz sand, it is made up 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 made up 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;
The mixing of the flyash of above-mentioned weight portion, calcium carbonate and kaolin is ground, crosses 280 mesh sieves;
Then mix with the sodium carbonate of above-mentioned weight portion, calcine 40 minutes at 800 DEG C;
Grinding after taking out, crosses 250 mesh sieves;
Powder after sieving is joined in the sulfuric acid solution of powder weight 10 times, mix and blend 0.5 hour;
Be heat 2 hours in the water-bath of 100 DEG C in temperature by the material after stirring;
After product is taken out, add water or sulfuric acid, regulate PH to 3;
Put into thermostatic drying chamber again, freeze-day with constant temperature 0.5 hour at 100-120 DEG C;
By dried material and each raw material mixed grinding of residue, cross 250 mesh sieves, obtain described batch mixing;
The concentration of described sulfuric acid is 70%.
Containing a preparation method for the molding sand of quartz sand, comprise the following steps:
(1) quartz sand of above-mentioned weight portion, montmorillonite mixing are ground, cross 250 mesh sieves;
(2) water of above-mentioned weight portion 70% is added in quartz sand after sizing and montmorillonite, premixed 40s;
(3) bentonite, coal tar, urea, calcium formate, the batch mixing of above-mentioned weight portion is added again, mix and blend 30s;
(4) finally add remaining water again, mixing 80s, obtains described molding sand.Performance test:
The fabrication evaluation performance of the casting sand utilizing the inventive method to produce is:
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 (1)
1., containing a molding sand for quartz sand, it is characterized in that what it was made up 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 made up 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;
The mixing of the flyash of above-mentioned weight portion, calcium carbonate and kaolin is ground, crosses 250-280 mesh sieve;
Then mix with the sodium carbonate of above-mentioned weight portion, at 750-800 DEG C, calcine 30-40 minute;
Grinding after taking out, crosses 200-250 mesh sieve;
Powder after sieving is joined in powder weight 8-10 sulfuric acid solution doubly, mix and blend 0.5-1 hour;
Be heat 1-2 hour in the water-bath of 90-100 DEG C in temperature by the material after stirring;
After product is taken out, add water or sulfuric acid, regulate PH to 2-3;
Put into thermostatic drying chamber again, freeze-day with constant temperature 0.5-1 hour at 100-120 DEG C;
By dried material and each raw material mixed grinding of residue, cross 200-250 mesh sieve, obtain described batch mixing;
The concentration of described sulfuric acid is 60-70%;
The preparation method of the described molding sand containing quartz sand, comprises the following steps:
(1) quartz sand of above-mentioned weight portion, montmorillonite mixing are ground, cross 150-250 mesh sieve;
(2) water of above-mentioned weight portion 60-70% is added in quartz sand after sizing and montmorillonite, premixed 40-50s;
(3) bentonite, coal tar, urea, calcium formate, the batch mixing of above-mentioned weight portion is added again, mix and blend 20-30s;
(4) finally add remaining water again, mixing 60-80s, obtains described molding sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210569239.1A CN103042161B (en) | 2012-12-25 | 2012-12-25 | A kind of molding sand containing quartz sand and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210569239.1A CN103042161B (en) | 2012-12-25 | 2012-12-25 | A kind of molding sand containing quartz sand and preparation method thereof |
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| Publication Number | Publication Date |
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| CN103042161A CN103042161A (en) | 2013-04-17 |
| CN103042161B true CN103042161B (en) | 2015-09-02 |
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Families Citing this family (8)
| 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 |
| 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 |
| 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 |
| 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 |
| CN113976817A (en) * | 2021-08-14 | 2022-01-28 | 曲阜市铸造材料厂 | Preparation method of mixed binder for green sand |
Family Cites Families (5)
| 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 |
| DE102009024013A1 (en) * | 2009-06-05 | 2010-12-09 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Green Fist Aerosande |
| CN102380575B (en) * | 2011-11-03 | 2013-10-02 | 铜陵和武机械制造有限责任公司 | Resin casting molding sand and preparation method thereof |
| CN102380576B (en) * | 2011-11-03 | 2013-10-02 | 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 |
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