CN103553657A - Fine magnesia molding sand and its preparation method - Google Patents
Fine magnesia molding sand and its preparation method Download PDFInfo
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- CN103553657A CN103553657A CN201310481182.4A CN201310481182A CN103553657A CN 103553657 A CN103553657 A CN 103553657A CN 201310481182 A CN201310481182 A CN 201310481182A CN 103553657 A CN103553657 A CN 103553657A
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Abstract
A fine magnesia molding sand is characterized in that the sand is prepared from the following raw materials: by weight, 10-15 parts of flint clay powder, 40-45 parts of andalusite, 70-80 parts of calcium bentonite raw ore, 230-250 parts of fine magnesia, 30-36 parts of straw powder, 12-16 parts of starch, 2-3 parts of polyethylene glycol, 20-30 parts of calcium chloride, 10-15 parts of nanometer attapulgite, 2-3 parts of carboxymethylcellulose sodium, 1-2 parts of n-butyl acetate and a proper amount of water. According to the invention, fine magnesia is used as a main raw material, and through calcining, dispersion and grinding and high-temperature calcining, the molding sand is endowed with excellent permeability, caking property, toughness, plasticity and collapsibility; with the combination of flint clay powder, andalusite and calcium bentonite, the molding sand has high-temperature resistance and can resist high temperature of more than 2500 DEG C; and by the use of straw powder, high temperature carbonization will not cause environmental pollution, and the molding sand can be recycled so as to increase economic benefit.
Description
Technical field
The present invention relates to a kind of casting field, relate in particular to a kind of particulate magnesia molding sand and preparation method thereof.
Background technology
Molding sand is in casting, to be used for the material of moulding.Molding sand is generally mixed according to a certain percentage by molding materials such as Foundry sand, moulding sand binder and additional things, also available natural silica sand argillaceous, the sand formulation Sand particle diameter that common cast aluminium is used is too large or too little, molding sand material footpath is too large, although ventilation property is better, aloxite part surface ratio is more coarse, smooth finish is bad, molding sand material footpath is too little, causes sand mold ventilation property bad, and aluminium casting has pore to produce.Domestic and international widely used coal dust clay green sand, generally by the mixed system of roughing sand, binding agent, coal dust additive etc. and water, formed, there is certain anti-scab effect and the cost of material is low, production efficiency is high, but its consumption is large, discharge is serious, at castingprocesses coal dust firing, decompose and produce toxic gas and pollute.
Molding sand is different by binding agent used, can be divided into clay-bonded sand, sodium silicate sand, cement sand, quartz sand etc., and that with clay-bonded sand, sodium silicate sand and quartz sand, uses is maximum.The effect of molding sand in Foundry Production is very important, and the casting wasted product causing because of the poor quality of molding sand accounts for 30～50% of the total waste product of foundry goods.Conventionally to the requirement of molding sand, be: 1, there is higher intensity and thermostability, to bear the effect of various external force and high temperature.2, good mobility, the ability that molding sand mutually moves between sand grains under external force or action of gravity own.3, certain plasticity-, molding sand is out of shape under external force, can keep the ability of the shape that gives after external force is removed.4, good ventilation property, molding sand hole sees through the ability of gas.5, high collapsibility, weighs up again grittiness, and after casting solidification, whether molding sand easily destroys, the performance of whether easily removing from foundry goods.
Current casting field development rapidly, higher for the performance requriements of steel casting and ironcasting, thereby require further to promote the performance of molding sand.
Summary of the invention
The object of the present invention is to provide a kind of particulate magnesia molding sand and preparation method thereof, this molding sand has good permeability, good, the resistant to elevated temperatures feature of collapsibility.
Technical scheme of the present invention is as follows:
A magnesia molding sand, is characterized in that being made by the raw material of following weight part: flint clay powder 10-15, andaluzite 40-45, raw ore of calcium base bentonite 70-80, particulate magnesia 230-250, straw powder material 30-36, starch 12-16, polyoxyethylene glycol 2-3, calcium chloride 20-30, nano-attapulgite 10-15, Xylo-Mucine 2-3, N-BUTYL ACETATE 1-2, water are appropriate;
The preparation method of described particulate magnesia molding sand, it is characterized in that comprising the following steps: flint clay powder, andaluzite, raw ore of calcium base bentonite, particulate magnesia are put into 530-560 ℃ of calcining furnace and calcine 3-4 hour, then, take out, be ground into 200-400 order powder, then add polyoxyethylene glycol, suitable quantity of water, dispersed with stirring, pugging, sends in 1430-1450 ℃ of calcining furnace and calcines 4-5 hour, taking-up is crushed to 50-100 order, obtains calcining material; Straw powder material, starch, calcium chloride, nano-attapulgite, N-BUTYL ACETATE are mixed, grind 20-30 minute, then mix with other remaining component, add and be equivalent to water wet mixing 10-15 minute of compound weight 3-5% and get final product.
Beneficial effect of the present invention
The present invention has used particulate magnesia for main raw material, through calcining, dispersion grinding, high-temperature calcination again, makes molding sand have excellent ventilation property, cohesiveness, toughness, plasticity-, collapsibility; Be combined with flint clay powder, andaluzite, calcium-base bentonite, make molding sand there is resistant to elevated temperatures characteristic, can tolerate the above high temperature of 2500 degree; By using straw powder material, high temperature carbonization, free from environmental pollution, reusable edible molding sand, increases economic benefit.
Embodiment
A magnesia molding sand, by following weight part (kilogram) raw material make: flint clay powder 12, andaluzite 43, raw ore of calcium base bentonite 74, particulate magnesia 240, straw powder material 33, starch 14, polyoxyethylene glycol 2, calcium chloride 24, nano-attapulgite 13, Xylo-Mucine 2.5, N-BUTYL ACETATE 1.5, water are appropriate;
The preparation method of described particulate magnesia molding sand, comprise the following steps: flint clay powder, andaluzite, raw ore of calcium base bentonite, particulate magnesia are put into 550 ℃ of calcining furnaces and calcine 3 hours, then, take out, be ground into 300 order powder, then add polyoxyethylene glycol, suitable quantity of water, dispersed with stirring, pugging, sends in 1440 ℃ of calcining furnaces and calcines 4.4 hours, taking-up is crushed to 80 orders, obtains calcining material; Straw powder material, starch, calcium chloride, nano-attapulgite, N-BUTYL ACETATE are mixed, grind 25 minutes, then mix with other remaining component, add and be equivalent to the water wet mixing 14 minutes of compound weight 4% and get final product.
The processing performance of the molding sand that the present invention makes:
Green compression strength: 0.152Mpa, air penetrability: 128%, hot green tensile strength: 478Kpa, shatter index: 87%.
Claims (2)
1. a particulate magnesia molding sand, is characterized in that being made by the raw material of following weight part: flint clay powder 10-15, andaluzite 40-45, raw ore of calcium base bentonite 70-80, particulate magnesia 230-250, straw powder material 30-36, starch 12-16, polyoxyethylene glycol 2-3, calcium chloride 20-30, nano-attapulgite 10-15, Xylo-Mucine 2-3, N-BUTYL ACETATE 1-2, water are appropriate.
2. the preparation method of particulate magnesia molding sand according to claim 1, it is characterized in that comprising the following steps: flint clay powder, andaluzite, raw ore of calcium base bentonite, particulate magnesia are put into 530-560 ℃ of calcining furnace and calcine 3-4 hour, then, take out, be ground into 200-400 order powder, then add polyoxyethylene glycol, suitable quantity of water, dispersed with stirring, pugging, sends in 1430-1450 ℃ of calcining furnace and calcines 4-5 hour, taking-up is crushed to 50-100 order, obtains calcining material; Straw powder material, starch, calcium chloride, nano-attapulgite, N-BUTYL ACETATE are mixed, grind 20-30 minute, then mix with other remaining component, add and be equivalent to water wet mixing 10-15 minute of compound weight 3-5% and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310481182.4A CN103553657A (en) | 2013-10-16 | 2013-10-16 | Fine magnesia molding sand and its preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310481182.4A CN103553657A (en) | 2013-10-16 | 2013-10-16 | Fine magnesia molding sand and its preparation method |
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| CN103553657A true CN103553657A (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310481182.4A Pending CN103553657A (en) | 2013-10-16 | 2013-10-16 | Fine magnesia molding sand and its preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106040961A (en) * | 2016-06-03 | 2016-10-26 | 苏州福德龙水产养殖有限公司 | High-strength and high-temperature-resistance 3D printing clay green sand material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357647A (en) * | 2011-10-24 | 2012-02-22 | 大连交通大学 | Environmentally-friendly magnesia sand for casting and preparation process thereof |
| CN103042162A (en) * | 2012-12-25 | 2013-04-17 | 马鞍山市万鑫铸造有限公司 | Argil contained moulding sand and preparation method thereof |
| CN103056281A (en) * | 2012-12-12 | 2013-04-24 | 青岛三合山精密铸造有限公司 | Preparation method of molding sands |
| CN103100646A (en) * | 2012-12-10 | 2013-05-15 | 马鞍山市万鑫铸造有限公司 | Method for manufacturing foundry sand by utilizing straw powder |
-
2013
- 2013-10-16 CN CN201310481182.4A patent/CN103553657A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357647A (en) * | 2011-10-24 | 2012-02-22 | 大连交通大学 | Environmentally-friendly magnesia sand for casting and preparation process thereof |
| CN103100646A (en) * | 2012-12-10 | 2013-05-15 | 马鞍山市万鑫铸造有限公司 | Method for manufacturing foundry sand by utilizing straw powder |
| CN103056281A (en) * | 2012-12-12 | 2013-04-24 | 青岛三合山精密铸造有限公司 | Preparation method of molding sands |
| CN103042162A (en) * | 2012-12-25 | 2013-04-17 | 马鞍山市万鑫铸造有限公司 | Argil contained moulding sand and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106040961A (en) * | 2016-06-03 | 2016-10-26 | 苏州福德龙水产养殖有限公司 | High-strength and high-temperature-resistance 3D printing clay green sand material and preparation method thereof |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20140205 |