CN107973609B - Casting sand mold material and preparation method thereof - Google Patents
Casting sand mold material and preparation method thereof Download PDFInfo
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- CN107973609B CN107973609B CN201711247349.5A CN201711247349A CN107973609B CN 107973609 B CN107973609 B CN 107973609B CN 201711247349 A CN201711247349 A CN 201711247349A CN 107973609 B CN107973609 B CN 107973609B
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- sand
- periclase
- water glass
- recycled
- spinel brick
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/131—Inorganic additives
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention relates to a casting sand mold material and a preparation method thereof, the raw materials are recycled periclase-spinel brick sand, magnesia and modified water glass, the recycled periclase-spinel brick sand comprises three granularities of 5-3 mm, 3-1 mm and less than or equal to 1mm, and the components are as follows: MgO is more than or equal to 75 percent, MgO + Al2O3≥80%，Fe2O3The content of the magnesia is not more than 1 percent, the CaO is not more than 1.5 percent, the composition of the magnesia comprises not less than 90 percent of MgO, the modifier of the modified water glass is polyacrylamide, and the modulus is 2.4-3.0. Mixing and stirring the recycled periclase-spinel brick sand and magnesia, adding modified water glass, continuously stirring, discharging, forming, drying at 180-260 ℃ for 8-24 h, and forming according to requirements for later use. The casting sand mold material has high refractoriness, good high-temperature performance, strong thermal shock resistance, no pollution to castings, simple and convenient construction, low cost and environmental protection.
Description
Technical Field
The invention relates to a fusion casting sand mold material and a preparation method thereof, belonging to the field of inorganic non-metallic material subject refractory materials.
Background
The sand mold is a key material for preparing the casting refractory material, the quality of the sand mold directly influences the quality of the casting refractory material after casting molding, and the requirements of the casting refractory material on the sand mold comprise: 1. the refractory degree is enough, so that the scouring of high-temperature melt can be resisted; 2. the assembly and transportation of the sand mold template are ensured by certain normal temperature strength and high temperature strength, and the integrity of the sand mold in the casting process is ensured; 3. good collapsibility, easy demoulding, and no sand contamination. The sand molds commonly used at present mainly comprise: water glass in combination with silica sand, as described in patent CN 102341550B; resin sand molding; magnesite sand molds, as described in patent CN 100381400C; graphite sand mold; novel negative pressure sand molds and the like, such as patents CN102674867B and CN 102672794B. The periclase-spinel brick is made up by using periclase and spinel as main raw materials and using periclase (MgO) and spinel as main mineral componentsStone (MgO-Al)2O3) All the materials are high melting point minerals, are in an isometric crystal system, and have isotropic thermal expansion. Because the thermal expansion coefficient of spinel is 7.6 x 10-6The periclase thermal expansion coefficient is 13.5 x 10-6And the difference is large, so that a large number of micro cracks are formed inside the periclase-spinel brick in the firing process, the structural toughness of the product is improved, the thermal stress is buffered, and the expansion of the formed cracks is stopped. Accordingly, the periclase-spinel brick has: the high-temperature-resistant rotary cement kiln has the advantages of high refractoriness, refractoriness under load, high thermal shock resistance, strong anti-scouring performance, high thermal shock stability, large elastic modulus and the like, and can meet the use requirements of high-temperature kilns such as transition zones, colored kilns and petrifaction.
At present, periclase-spinel is widely applied to a transition zone of a rotary cement kiln, and the service life of the transition zone is 10-14 months. About 1700 cement kiln production lines exist in the whole country, the replaced and eliminated used magnesia-alumina spinel bricks are about 10 million tons or more every year, the utilization rate is low, the environment is polluted, and resources are wasted.
Disclosure of Invention
The invention aims to develop a casting sand mold material and a preparation method thereof, which can reduce the cost of casting sand molds, meet the requirements of production and preparation of casting refractory materials, recycle used magnesium-aluminum spinel bricks, save refractory resources and reduce environmental load.
The invention adopts the following raw materials of recycled magnesite-spinel brick sand, magnesite and additional modified water glass according to the mass percentage:
(1) 10-30% of recycled periclase-spinel brick sand with the granularity of 5-3 mm
(2) 30-60% of recycled periclase-spinel brick sand with the granularity of 3-1 mm
(3) 0-30% of recycled periclase-spinel brick sand with the granularity of less than or equal to 1mm
(4) 10-40% of magnesia with the granularity less than or equal to 1mm
(5) 4-8% of modified water glass.
The recycled magnesite-spinel brick sand raw material is used as rear magnesite-spinel bricks at positions such as a cement kiln transition zone, used waste bricks are selected, homogenized and crushed, reaction layer portions eroded by cement clinker are removed during selection, the impurity content of the used waste bricks is reduced as much as possible, the waste brick sand components are unified and stable after homogenization, the granularity required by crushing into sand molds is 5-3 mm, 3-1 mm and is less than or equal to 1mm, and the recycled magnesite-spinel brick sand raw material comprises the following components in parts by weight: MgO is more than or equal to 75 percent, MgO + Al2O3≥80%，Fe2O3≤1 %，CaO≤ 1.5%。
The magnesia contains MgO with a content of more than or equal to 90 percent.
The modulus of the modified water glass is 2.4-3.0.
The modified water glass is characterized in that a modifier is polyacrylamide, and the weight ratio of the modifier to the modifier is 1: adding the mixture into a water glass solution in a ratio of 7-10, and standing for 24 hours.
The preparation method of the casting sand mold material comprises the steps of weighing raw materials, mixing, molding, drying and mold assembling, wherein the raw materials meeting the requirements of the granularity and the components are weighed according to the required proportion, the raw materials are mixed in a stirrer for 1-3 minutes, modified water glass with a certain proportion is added, the stirring is continued for 3-5 minutes, manual or mechanical molding is carried out according to the size requirement of a mold plate after discharging, the drying is to dry the sand parison for 8-24 hours at 180-260 ℃, and the mold assembling is carried out for standby application according to the requirements after the drying.
The invention has the remarkable technical effects that:
(1) the periclase-spinel brick has the performances of high refractoriness and refractoriness under load, high thermal shock resistance, structural peeling resistance, erosion resistance, strong scouring resistance, high thermal shock stability, large elastic modulus and the like, has a thin erosion layer and low impurity content after being used, and can be used for casting a refractory material sand mold to replace silica sand and magnesia.
(2) The periclase-spinel brick sand mold is recovered after the modified water glass is combined, so that the cost of the casting sand mold can be reduced, the requirements of production and preparation of casting refractory materials are met, the used magnesium-aluminum spinel brick can be recycled, refractory resources are saved, and the environmental load is reduced.
(3) The periclase-spinel brick sand mold is recovered after the modified water glass is combined, so that the refractory degree is high, the high-temperature performance is good, the thermal shock resistance is strong, the casting is not polluted, and the construction is simple and convenient.
Detailed Description
Example 1
Expressed by weight percentage, the raw materials are as follows: 15% of recycled periclase-spinel brick sand of 5-3 mm, 45% of recycled periclase-spinel brick sand of 3-1 mm, and the recycled periclase-spinel brick sand comprises the following components in parts by weight: MgO 82.5%, MgO + Al2O391.9%，Fe2O30.72 percent of magnesia, 1.03 percent of CaO, 40 percent of magnesia with the diameter less than or equal to 1mm, and the MgO content of the magnesia is 95.3 percent; the added amount of the modified water glass is 6%, the modified water glass is prepared by adding polyacrylamide into a water glass solution at normal temperature according to the weight ratio of 1:7, and standing for 24 hours. The modulus of the modified water glass is 2.9. Weighing the raw materials according to the required proportion, mixing the raw materials in a stirrer for 1 minute, adding 5 percent by weight of modified water glass, continuing stirring for 3 minutes, discharging, carrying out manual or mechanical forming according to the size requirement of a template, drying for 8 hours at 220 ℃, and forming the template according to the requirement after drying for later use. The performance indexes are shown in the following table 1:
example 2
Expressed by weight percentage, the raw materials are as follows: 10% of recycled periclase-spinel brick sand with the thickness of 5-3 mm, 45% of recycled periclase-spinel brick sand with the thickness of 3-1 mm, 20% of recycled periclase-spinel brick sand with the thickness of less than or equal to 1mm, and the recycled periclase-spinel brick sand comprises the following components in parts by weight: 80.4% of MgO, MgO + Al2O388.9%，Fe2O30.76 percent of magnesia, 1.25 percent of CaO, 20 percent of magnesia with the grain diameter less than or equal to 1mm, and the MgO content of the magnesia is 95.7 percent; the addition amount of the modified water glass is 5%, the modified water glass is prepared by adding polyacrylamide into a water glass solution at normal temperature according to the weight ratio of 1:10, and standing for 24 hours. The modulus of the modified water glass is 2.7. The raw materials are weighed according to the required mixture ratio, mixed in a stirrer for 2 minutes,adding 7 wt% of modified water glass, continuously stirring for 3 minutes, discharging, carrying out manual or mechanical forming according to the size requirement of the template, drying at 240 ℃ for 12 hours, and forming the template for later use according to the requirement after drying. The performance indexes are shown in the following table 2:
example 3
Expressed by weight percentage, the raw materials are as follows: 12% of recycled periclase-spinel brick sand with the thickness of 5-3 mm, 55% of recycled periclase-spinel brick sand with the thickness of 3-1 mm, 13% of recycled periclase-spinel brick sand with the thickness of less than or equal to 1mm, and the recycled periclase-spinel brick sand comprises the following components in parts by weight: MgO 82.4%, MgO + Al2O393.7%，Fe2O30.57 percent of magnesia, 1.05 percent of CaO, 20 percent of magnesia with the thickness less than or equal to 1mm, and the MgO content of the magnesia is 92.7 percent; the addition amount of the modified water glass is 4%, the modified water glass is prepared by adding polyacrylamide into a water glass solution at normal temperature according to the weight ratio of 1:8, and standing for 24 hours. The modulus of the modified water glass is 2.8. Weighing the raw materials according to the required proportion, mixing the raw materials in a stirrer for 2 minutes, adding 4 weight percent of modified water glass, continuing stirring for 2 minutes, discharging, carrying out manual or mechanical forming according to the size requirement of a template, drying for 16 hours at 180 ℃, and forming the template according to the requirement after drying for later use. The performance indexes are shown in the following table 3:
example 4
Expressed by weight percentage, the raw materials are as follows: 20% of recycled periclase-spinel brick sand with the thickness of 5-3 mm, 45% of recycled periclase-spinel brick sand with the thickness of 3-1 mm, 10% of recycled periclase-spinel brick sand with the thickness of less than or equal to 1mm, and the recycled periclase-spinel brick sand comprises the following components in parts by weight: MgO 78.8%, MgO + Al2O388.1%，Fe2O30.72 percent of magnesia, 1.15 percent of CaO, 25 percent of magnesia with the thickness less than or equal to 1mm, and 96.7 percent of MgO content of the magnesia; the added amount of the modified water glass is 6 percent, and the modified water glass adopts polyacrylamide at normal temperature according to weightAdding the mixture into a water glass solution according to the weight ratio of 1:7, and standing for 24 hours for use. The modulus of the modified water glass is 2.5. Weighing the raw materials according to the required proportion, mixing the raw materials in a stirrer for 1 minute, adding 6 weight percent of modified water glass, continuing stirring for 3 minutes, discharging, carrying out manual or mechanical forming according to the size requirement of a template, drying at 260 ℃ for 10 hours, and forming the template according to the requirement after drying for later use. The performance indexes are shown in the following table 4:
comparative example 1
Expressed by weight percentage, the raw materials are as follows: 10% of recycled periclase-spinel brick sand with the thickness of 5-3 mm, 45% of recycled periclase-spinel brick sand with the thickness of 3-1 mm, 20% of recycled periclase-spinel brick sand with the thickness of less than or equal to 1mm, and the recycled periclase-spinel brick sand comprises the following components in parts by weight: 80.4% of MgO, MgO + Al2O388.9%，Fe2O30.76 percent of magnesia, 1.25 percent of CaO, 20 percent of magnesia with the grain diameter less than or equal to 1mm, and the MgO content of the magnesia is 95.7 percent; the added amount of the common water glass is 10 percent, and the modulus of the common water glass is 2.8. Weighing the raw materials according to the required proportion, mixing the raw materials in a stirrer for 2 minutes, adding 10 weight percent of water glass, continuously stirring for 2 minutes, discharging, carrying out manual or mechanical forming according to the size requirement of a template, drying for 16 hours at 180 ℃, and forming the template according to the requirement after drying for later use. The performance indexes are shown in the following table 5:
in the comparative example, the binder is common water glass, and the usage amount of the binder needs to be increased to 10% in order to ensure the initial strength and the construction time of the sand mold, but due to excessive water glass addition, on one hand, the normal temperature strength of the template is reduced, and on the other hand, the sand mold generates excessive low-melting substances to be sintered in the casting process, so that the refractoriness of the sand mold is reduced, the thermal shock resistance of the sand mold is seriously reduced, and the casting of the product is influenced.
Comparative example 2
Expressed by weight percentage, the raw materials are as follows: 20% of recycled periclase-spinel brick sand with the thickness of 5-3 mm, 45% of recycled periclase-spinel brick sand with the thickness of 3-1 mm, 10% of recycled periclase-spinel brick sand with the thickness of less than or equal to 1mm, and the recycled periclase-spinel brick sand comprises the following components in parts by weight: MgO 78.8%, MgO + Al2O388.1%，Fe2O30.72 percent of magnesia, 1.15 percent of CaO, 25 percent of magnesia with the thickness less than or equal to 1mm, and 96.7 percent of MgO content of the magnesia; the added amount of the modified water glass is 2%, the modified water glass is prepared by adding polyacrylamide into a water glass solution at normal temperature according to the weight ratio of 1:7, and standing for 24 hours. The modulus of the modified water glass is 2.5. Weighing the magnesia-alumina spinel according to the required proportion, mixing the materials in a stirrer for 1 minute, adding 6 weight percent of modified water glass, continuing stirring for 3 minutes, discharging, carrying out manual or mechanical forming according to the requirement, drying at 260 ℃ for 10 hours, and forming the die according to the requirement for later use. The performance indexes are shown in the following table 6:
in the comparative example, the sand mold raw material mainly adopts recycled periclase-spinel brick sand, and the raw material has the characteristics of high impurity content, high water absorption and the like, so that the defects of too short sand mold molding construction time, low strength after molding and drying and the like caused by the fact that the added amount of water glass serving as a bonding agent is too low are overcome, the transportation and the assembly of the sand mold are not facilitated, and the poor thermal shock resistance and the casting of products are not facilitated due to the low bonding strength.
Claims (5)
1. A casting sand mold material comprises the following raw materials of recycled periclase-spinel brick sand, magnesia and additionally modified water glass in percentage by mass:
10-30% of recycled periclase-spinel brick sand with the granularity of 5-3 mm;
30-60% of recycled periclase-spinel brick sand with the granularity of 3-1 mm;
0-30% of recycled periclase-spinel brick sand with the granularity less than or equal to 1 mm;
10-40% of magnesia with the granularity less than or equal to 1 mm;
4-8% of modified water glass;
the modulus of the modified water glass is 2.4-3.0, and the modifier is polyacrylamide.
2. The fused cast sand mold material according to claim 1, wherein: the recycled periclase-spinel brick sand comprises the following components: MgO is more than or equal to 75 percent, MgO + Al2O3≥80%，Fe2O3≤1 %，CaO≤ 1.5%。
3. A fused cast sand mold material according to claim 1, wherein the MgO content of the magnesite is not less than 90%.
4. The fused cast sand mold material according to claim 1, wherein the modifier is added to the molten sand mold material at room temperature in a weight ratio of 1: adding the mixture into a water glass solution in a ratio of 7-10, and standing for 24 hours.
5. A preparation method of the casting sand mold material according to any one of claims 1 to 4, comprising the steps of weighing raw materials meeting the requirements of the particle size and the components according to the required proportion, mixing the raw materials in a stirrer for 1 to 3 minutes, adding modified water glass, continuously stirring for 3 to 5 minutes, discharging, forming, drying a sand parison at 180 to 260 ℃ for 8 to 24 hours, and then forming the sand parison for later use.
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| CN107973609B true CN107973609B (en) | 2020-10-30 |
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| CN112341225A (en) * | 2020-09-28 | 2021-02-09 | 太原科技大学 | High-temperature-resistant high-strength artificial spherical ceramsite sand for large castings and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1903794A (en) * | 2006-08-08 | 2007-01-31 | 北京瑞泰高温材料科技股份有限公司 | Magnesia profile sand for preparing founding aluminium oxide refractory material |
| CN101376503A (en) * | 2008-09-28 | 2009-03-04 | 上海应用技术学院 | Waterglass composite modifying method and method for using modified waterglass in mould sand configuration |
| CN102351550A (en) * | 2011-07-15 | 2012-02-15 | 郑州远东耐火材料有限公司 | Preparation method of sand die material of fused zirconia corundum block |
| CN104557062A (en) * | 2013-10-16 | 2015-04-29 | 太原科技大学 | Spinel casting sand and preparation method thereof |
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2017
- 2017-12-01 CN CN201711247349.5A patent/CN107973609B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1903794A (en) * | 2006-08-08 | 2007-01-31 | 北京瑞泰高温材料科技股份有限公司 | Magnesia profile sand for preparing founding aluminium oxide refractory material |
| CN101376503A (en) * | 2008-09-28 | 2009-03-04 | 上海应用技术学院 | Waterglass composite modifying method and method for using modified waterglass in mould sand configuration |
| CN102351550A (en) * | 2011-07-15 | 2012-02-15 | 郑州远东耐火材料有限公司 | Preparation method of sand die material of fused zirconia corundum block |
| CN104557062A (en) * | 2013-10-16 | 2015-04-29 | 太原科技大学 | Spinel casting sand and preparation method thereof |
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