CN100381400C - Magnesia profile sand for preparing founding aluminium oxide refractory material - Google Patents
Magnesia profile sand for preparing founding aluminium oxide refractory material Download PDFInfo
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- CN100381400C CN100381400C CNB2006101043391A CN200610104339A CN100381400C CN 100381400 C CN100381400 C CN 100381400C CN B2006101043391 A CNB2006101043391 A CN B2006101043391A CN 200610104339 A CN200610104339 A CN 200610104339A CN 100381400 C CN100381400 C CN 100381400C
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- magnesia
- sand
- magnesium
- aluminium oxide
- sand mold
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Abstract
The present invention relates to a magnesium molding sand for preparing fused cast alumina refractory material. Its composition includes coarse, medium and fine magnesite sands, magnesia alumina spinel and water glass inorganic binding agent. The above-mentioned raw materials are mixed according to a certain mixing ratio, formed and dried so as to obtain the sand pattern with a certain shape. Besides, said invention also provides the concrete mixing ratio of all the above-mentioned raw materials.
Description
Relate to the field
The present invention relates to a kind of molding sand material for preparing the used sand mold of refractory materials.
Correlation technique
Fused cast aluminabrick is the high-grade refractory materials that is used to build by laying bricks or stones the glass melter key position.This kind material melts temperature is very high, is difficult to make.During casting, the temperature of this material liquation reaches about 2000 ℃, and the time of insulation annealing is long, and high temperature solution produces intensive thermal shocking and long-term continuous high temperature effect to casting with sand mold.Therefore, the working conditions of this kind sand mold is very harsh, is the critical material of producing the founding aluminium oxide high-grade refractory.
The tradition sand mold manufacture material---it is wedding agent that molding sand adopts water glass, and siliceous raw material is that molding material is made.Because of SiO
2Only 1713 ℃ of fusing points, siliceous sand mold surface is melted during the high temperature casting, and and the aluminum oxide foundry goods vigorous reaction and closely adhesion at high temperature take place.So traditional siliceous sand mold can not be used to produce the founding aluminium oxide material.Table 1 is traditional siliceous sand mold physical and chemical index.
The traditional siliceous sand mold physical and chemical index of table 1
* annotate: the thermal-shock resistance decision method: thickness is 40mm sand mold plate, be combined into the sand mold mould of following cavity dimension: height * wide * thick=600mm * 400mm * 75mm, 5 is one group, (400mm * 75mm combinatorial surface) carries out continuous casting from short transverse, in casting cycle, being damaged if any one in one group promptly stops casting; Carry out second group of casting then, the rest may be inferred, casts three groups altogether.If three groups all do not have damaged judgement good, it is qualified to have only one group of generation breakage to judge, breakages takes place more than two groups or two groups all judge defective.
At present, employing water glass is wedding agent, and makes the sand mold that is used to produce founding aluminium oxide refractory material as molding material with the useless brick material of founding aluminium oxide.The fusing point of aluminum oxide is very high, but water glass meeting and aluminum oxide reaction form nepheline (Na
2OAl
2O
32SiO
2, only 1526 ℃ of fusing points).Therefore, though water glass has improvement in conjunction with the high-temperature behavior of the useless brick sand mold of founding aluminium oxide, but still accidents such as foundry goods scab, distortion often take place.
The table 2 founding aluminium oxide brick material sand mold physical and chemical index that gives up
Along with the Technology progress, the useless brick that produces when producing fused cast aluminabrick is fewer and feweri, utilizes the useless brick material of founding aluminium oxide more and more difficult as the sand mold raw material.So, must develop the fused cast aluminabrick sand mould material of a new generation as early as possible.
Summary of the invention
The objective of the invention is to develop a kind of preparation founding aluminium oxide refractory material magnesia profile sand, make the sand mold of its preparation have excellent mechanical intensity and thermal-shock resistance, high-temperature behavior is good, satisfies the service requirements of fused cast aluminabrick to sand mold better.
Improve the high-temperature behavior of sand mold and must use the high raw mineral materials of refractoriness, the periclasite mineral have good heat-resistance and resistance to fouling, but it is very high that this raw material is easy to aquation, thermal expansivity, heat-shock resistance is poor, thermo-labile impact can not be used to make founding aluminium oxide goods sand mould material simply.The present invention is a main raw material with magnesia, is wedding agent with water glass, adopts special substance and particle proportioning, has improved the anti-aquation of material, thermal shock resistance.
Aquation mainly is the periclasite in the magnesia and the reaction (MgO+H of water
2O=Mg (OH)
2).Thermal shock resistance is main relevant with the factor of two aspects: 1) Mg (OH)
2Thermal dehydration (Mg (OH)
2=MgO+H
2O ↑), moment produces a large amount of steams, makes sand mold breakdown; 2) thermal expansivity of MgO is very high, is subjected to produce very big thermal stresses after the thermal shocking, makes sand mold breakdown.For the aquation and the raising heat-shock resistance that reduce MgO, the present invention replaces part equigranular magnesia with the magnesium-aluminium spinel fine powder, and adopts the prescription of high coarse particles content.Experiment shows: after the content of 6～3mm magnesia particle is increased to 30～40% from 20%, can improve heat-shock resistance 1～3 time; With account for total amount 5～8%,＜after the magnesium-aluminium spinel of 1mm replaces equigranular magnesia, also can improve heat-shock resistance 1～2 time, and make the material decatize have volume stability (not ftractureing) preferably after 2.5 hours.Thereby it is good that the magnesia sand mold that the present invention is developed has high-temperature behavior, and thermal shock resistance is strong, do not pollute advantages such as aluminum oxide foundry goods, can satisfy fully and produce the service requirements of fused cast aluminabrick to sand mold.
The present invention adopts following proportioning process to realize such scheme:
1) weight of 6-3mm part accounts for the 30-40% of total amount, and material is the magnesia of MgO content 〉=90%.
2) weight of 3-1mm part accounts for the 30-40% of total amount, and material is the magnesia of MgO content 〉=90%.
3)＜and the weight of 1mm part accounts for the 20-40% of total amount, and material is the magnesia and the Al of MgO content 〉=90%
2O
3The magnesium-aluminium spinel of+MgO content 〉=90%, wherein MgO content 〉=20% of magnesium-aluminium spinel.In this granularity, the ratio of magnesia and magnesium-aluminium spinel is 4: 1～5: 0.
4) the inorganic bonding agent modulus of water glass is 2.0-3.2, and its outer add-on is the 5-10% of above-mentioned solid material gross weight.
The raw material that meets above-mentioned granularity and composition requirement adds the water glass wedding agent and makes magnesia profile sand after weighing, cooperating, and mixes system, moulding, drying again, is assembled into sand mold according to the shape of foundry goods.
Specific embodiment
Embodiment 1: with the magnesia 30% of the magnesia 30% of granularity 6-3mmMgO content 94.0%, 3-1mmMgO content 94.0%,＜magnesia 32% of 1mmMgO content 94.0%,＜1mm Al
2O
3+ MgO content is after 95.5% magnesium-aluminium spinel (wherein MgO content 〉=25%) 8% cooperates, add 7% modulus and be 2.8 water glass and be mixed with magnesia profile sand, after mixing system, moulding, drying, assembly unit becomes the refractory magnesia-alumina material sand mold of inner cavity size length * wide * height=500mm * 400mm * 200mm, be used to the fused cast aluminabrick of casting, 1920 ℃ of melt temperatures.Sand mold does not rupture during casting, sand removal easily after insulation annealing is finished, and fused cast aluminabrick foundry goods physical dimension meets the requirements.The performance of magnesia sand mould material is:
The performance index of the magnesia sand mould material of table 3
Embodiment 2: with granularity 6-3mmMgO content be 98.5% magnesia 35%, 3-1mmMgO content be 98.5% magnesia 35%,＜1mmMgO content is after 98.5% magnesia 30% cooperates, add 7% modulus and be 2.8 water glass and be mixed with magnesia profile sand, after mixing system, moulding, drying, assembly unit becomes the magnesite refractory sand mold of inner cavity size length * wide * height=400mm * 120mm * 600mm, be used to the fused cast aluminabrick of casting, 1920 ℃ of melt temperatures.Sand mold does not rupture during casting, sand removal easily after insulation annealing is finished, and fused cast aluminabrick foundry goods physical dimension meets the requirements.The performance of magnesia sand mould material is:
The performance index of the magnesia sand mould material of table 4
From above embodiment as can be known: the magnesite refractory sand mold has excellent mechanical intensity and thermal-shock resistance, high-temperature behavior is good, can satisfy the service requirements of fused cast aluminabrick to sand mold fully.
Claims (1)
1. one kind prepares the founding aluminium oxide refractory material magnesia profile sand, it is characterized in that: described molding sand is by slightly, in, particulate magnesia and magnesium aluminium spinel powder and water glass are formed, its proportioning is: granularity is the 30-40% that the magnesia weight of 6-3mm part accounts for total amount, granularity is the 30-40% that the magnesia weight of 3-1mm part accounts for total amount, granularity is＜the 1mm part: magnesia and magnesium-aluminium spinel weight account for the 20-40% of total amount, in this granularity, the ratio of magnesia and magnesium-aluminium spinel is 4: 1～5: 0, the MgO content of above-mentioned all magnesia all 〉=90%, the Al of above-mentioned magnesium-aluminium spinel
2O
3+ MgO content 〉=90%, MgO content 〉=20% of magnesium-aluminium spinel wherein, the inorganic bonding agent modulus of water glass is 2.0-3.2, its outer add-on is the 5-10% of above-mentioned solid material gross weight.
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|---|---|---|---|
| CNB2006101043391A CN100381400C (en) | 2006-08-08 | 2006-08-08 | Magnesia profile sand for preparing founding aluminium oxide refractory material |
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|---|---|---|---|
| CNB2006101043391A CN100381400C (en) | 2006-08-08 | 2006-08-08 | Magnesia profile sand for preparing founding aluminium oxide refractory material |
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| CN1903794A CN1903794A (en) | 2007-01-31 |
| CN100381400C true CN100381400C (en) | 2008-04-16 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486580B (en) * | 2008-04-16 | 2011-08-24 | 中钢集团耐火材料有限公司 | Ferro-magnesium-aluminum spinelle fire-resistant material |
| CN102515799A (en) * | 2011-12-19 | 2012-06-27 | 青岛正望钢水控制股份有限公司 | Novel slag line material |
| CN102515802A (en) * | 2011-12-20 | 2012-06-27 | 徐州佳华新材料有限公司 | Method for preparing fused zirconia corundum feed basin |
| CN102515805A (en) * | 2011-12-23 | 2012-06-27 | 中钢集团洛阳耐火材料研究院有限公司 | Magnesian refractory castable binding agent |
| CN107935570A (en) * | 2017-12-01 | 2018-04-20 | 瑞泰科技股份有限公司 | A kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof |
| CN107973609B (en) * | 2017-12-01 | 2020-10-30 | 瑞泰科技股份有限公司 | Casting sand mold material and preparation method thereof |
| CN111187088B (en) * | 2020-02-14 | 2022-06-07 | 海城市中昊镁业有限公司 | Method for preparing high thermal shock magnesia raw material by compounding medium-grade magnesia and fused magnesia |
| CN114836134A (en) * | 2022-05-18 | 2022-08-02 | 郑州东方安彩耐火材料有限公司 | Preparation process of adhesive for casting mold and sand mold plate combination of casting alpha beta-corundum brick |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254081A (en) * | 1998-11-12 | 2000-05-24 | 宁波韵升强磁材料有限公司 | Neodymium iron boron permanent magnet material intermediate frequency induction furnace smelted crucible knotting method |
-
2006
- 2006-08-08 CN CNB2006101043391A patent/CN100381400C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254081A (en) * | 1998-11-12 | 2000-05-24 | 宁波韵升强磁材料有限公司 | Neodymium iron boron permanent magnet material intermediate frequency induction furnace smelted crucible knotting method |
Non-Patent Citations (2)
| Title |
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| 新型铝镁浇注料的开发与应用. 刘卫新.山东冶金. 2005 * |
| 水玻璃镁砂敷层在铸钢生产中的应用. 路光星.铸造. 1988 * |
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| CN1903794A (en) | 2007-01-31 |
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