CN104801656A - Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand - Google Patents

Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand Download PDF

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Publication number
CN104801656A
CN104801656A CN201510152146.2A CN201510152146A CN104801656A CN 104801656 A CN104801656 A CN 104801656A CN 201510152146 A CN201510152146 A CN 201510152146A CN 104801656 A CN104801656 A CN 104801656A
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parts
foundry sand
slurry
sand
weight
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CN201510152146.2A
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江守仲
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江守仲
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Priority to CN201510152146.2A priority Critical patent/CN104801656A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds

Abstract

The invention discloses highly fire-resistant foundry sand for steel casting and a preparation method of the highly fire-resistant foundry sand. The highly fire-resistant foundry sand is prepared from the following raw materials in parts by weight: 50-80 parts of fused ceramite, 10-15 parts of high-alumina cement, 17-23 parts of sludge dry powder, 20-30 parts of volcanic tuff, 15-25 parts of dickite, 16-22 parts of natural manganese sand, 8-12 parts of nacrite, 10-15 parts of asbestos powder, 5-10 parts of aluminum dihydrogen tripolyphosphate, 10-15 parts of modified bentonite, 4-8 parts of alumn powder, 3-6 parts of cellulose glycolate, 2.5-4.5 parts of corn syrup, 4.5-6.5 parts of beryllium oxide, 3-5 parts of China wood oil, 4-6 parts of sodium metasilicate, 2-4 parts of polyethylene glycol and an appropriate amount of water. Compared with conventional foundry sand, the highly fire-resistant foundry sand provided by the invention is not only excellent in fire-resistant performance, can maintain a higher strength and relatively low thermal expansion coefficient under high temperature, does not easily cause expansion and breakage, has excellent plasticity, air permeability and collapsibility, can remarkably improve the surface quality of castings and improve the finished product rate of castings.

Description

A kind of cast steel high refractory molding sand and preparation method thereof
Technical field
The present invention relates to a kind of cast steel high refractory molding sand and preparation method thereof, belong to molding sand technical field.
Background technology
Molding sand is used for the material of moulding 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 the 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.Along with the development of foundry engieering, require more and more high to the fire resistance of molding sand, and the molding sand on existing market cannot meet above-mentioned requirements, at high operating temperatures, molding sand easily expands, Fragmentation Phenomena, and foundry goods easily produces scab defect, thus affects the casting of foundry goods.Therefore, the high refractory molding sand of a kind of cast steel of exploitation is badly in need of, to meet the need of market.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of cast steel high refractory molding sand and preparation method thereof is provided, improve the fire resistance of molding sand.
The technical solution used in the present invention is as follows:
The high refractory molding sand of a kind of cast steel, is made up of the raw material of following weight portion: nice foundry sand 50-80, alumina cement 10-15, sludge dry powder 17-23, tufa stone 20-30, dickite 15-25, natural manganese sand 16-22, nacrite 8-12, flake asbestos 10-15, aluminium dihydrogen tripolyphosphate 5-10, modified alta-mud 10-15, alum powder 4-8, carboxymethyl cellulose 3-6, corn syrup 2.5-4.5, beryllium oxide 4.5-6.5, tung oil 3-5, sodium metasilicate 4-6, polyethylene glycol 2-4, water are appropriate;
Described method for preparing modified bentonite is as follows: the slurries that solid content is 35-45% are made in the making beating that added water by bentonite, then the sodium phosphate trimer being equivalent to slurry weight weight 8-12% is added, the urea of 3-6%, the calcium lignosulfonate of 5-10%, the citric acid of 2-5%, the calcium tetraborate of 10-15%, the aluminium hydroxide of 5-10%, the ferric sulfate of polymerized silica of 8-12%, the sodium tungstate of 4-8%, be warming up to 70-80 DEG C, 4000-5000rpm speed lapping 15-20min, and then add the emulsifier op-10 being equivalent to slurry weight 2-3%, the polyvinylpyrrolidone of 5-10%, the sodium carboxymethyl starch of 4-6%, stir, be warming up to 80-90 DEG C, add the vinyl acetate being equivalent to slurry weight 40-50% again, the methacrylic acid of 10-15%, the butyl acrylate of 20-30%, the ammonium persulfate of 1-2%, stirring reaction 0.5-1h, filter, dry.
The cast steel of the present invention preparation method of high refractory molding sand, comprises the following steps:
(1) nice foundry sand, sludge dry powder, natural manganese sand, modified alta-mud, alum powder, carboxymethyl cellulose, beryllium oxide are dry mixed 15-25s, then add the water wet mixing 3-4min accounting for mixture weight 1.5-2.5%, obtain slurry A;
(2) tufa stone and dickite are mixed, pulverize, add alumina cement, nacrite, flake asbestos, aluminium dihydrogen tripolyphosphate, sodium metasilicate, polyethylene glycol after crossing 100-150 mesh sieve, be dry mixed 10-15s, account for the water wet mixing 1-3min of mixture weight 1-2%, obtain slurry B;
(3) slurry A is put into puddle mixer together with slurry B, then add corn syrup, tung oil, mixing 0.5-1h.
Beneficial effect of the present invention:
Compare with traditional sand facies, molding sand of the present invention not only has excellent fire resistance, still can keep higher intensity and lower thermal coefficient of expansion at high operating temperatures, molding sand not easily expands, Fragmentation Phenomena, foundry goods not easily produces scab defect, also there is excellent plasticity, gas permeability and collapsibility, can surface quality of continuous castings be significantly improved, improve casting yield.
Detailed description of the invention
The high refractory molding sand of a kind of cast steel, is made up of the raw material of following weight (kg): nice foundry sand 65, alumina cement 12, sludge dry powder 19, tufa stone 25, dickite 20, natural manganese sand 18, nacrite 10, flake asbestos 12, aluminium dihydrogen tripolyphosphate 8, modified alta-mud 12, alum powder 6, carboxymethyl cellulose 4, corn syrup 3.5, beryllium oxide 5.5, tung oil 4, sodium metasilicate 5, polyethylene glycol 3, water are appropriate;
Described method for preparing modified bentonite is as follows: the slurries that solid content is 40% are made in the making beating that added water by bentonite, then the sodium phosphate trimer being equivalent to slurry weight weight 10% is added, the urea of 4.5%, the calcium lignosulfonate of 8%, the citric acid of 3%, the calcium tetraborate of 12%, the aluminium hydroxide of 8%, the ferric sulfate of polymerized silica of 10%, the sodium tungstate of 6%, be warming up to 75 DEG C, 5000rpm speed lapping 15min, and then add the emulsifier op-10 being equivalent to slurry weight 2.5%, the polyvinylpyrrolidone of 7%, the sodium carboxymethyl starch of 5%, stir, be warming up to 85 DEG C, add the vinyl acetate being equivalent to slurry weight 45% again, the methacrylic acid of 15%, the butyl acrylate of 25%, the ammonium persulfate of 1.5%, stirring reaction 0.5h, filter, dry.
The cast steel preparation method of high refractory molding sand, comprises the following steps:
(1) nice foundry sand, sludge dry powder, natural manganese sand, modified alta-mud, alum powder, carboxymethyl cellulose, beryllium oxide are dry mixed 20s, then add the water wet mixing 3min accounting for mixture weight 2%, obtain slurry A;
(2) tufa stone and dickite are mixed, pulverize, add alumina cement, nacrite, flake asbestos, aluminium dihydrogen tripolyphosphate, sodium metasilicate, polyethylene glycol after crossing 150 mesh sieves, be dry mixed 10s, account for the water wet mixing 2min of mixture weight 1.5%, obtain slurry B;
(3) slurry A is put into puddle mixer together with slurry B, then add corn syrup, tung oil, mixing 45min.
The performance test of the molding sand that above-described embodiment obtains is as follows:
Refractory temperature: 1850 DEG C;
Green compression strength (kPa): 61;
24h tensile strength (MPa): 0.75;
Gas permeability: 137;
Compact rate of molding (%): 56;
Shatter index (%): 87.

Claims (2)

1. the high refractory molding sand of cast steel, it is characterized in that, be made up of the raw material of following weight portion: nice foundry sand 50-80, alumina cement 10-15, sludge dry powder 17-23, tufa stone 20-30, dickite 15-25, natural manganese sand 16-22, nacrite 8-12, flake asbestos 10-15, aluminium dihydrogen tripolyphosphate 5-10, modified alta-mud 10-15, alum powder 4-8, carboxymethyl cellulose 3-6, corn syrup 2.5-4.5, beryllium oxide 4.5-6.5, tung oil 3-5, sodium metasilicate 4-6, polyethylene glycol 2-4, water are appropriate;
Described method for preparing modified bentonite is as follows: the slurries that solid content is 35-45% are made in the making beating that added water by bentonite, then the sodium phosphate trimer being equivalent to slurry weight weight 8-12% is added, the urea of 3-6%, the calcium lignosulfonate of 5-10%, the citric acid of 2-5%, the calcium tetraborate of 10-15%, the aluminium hydroxide of 5-10%, the ferric sulfate of polymerized silica of 8-12%, the sodium tungstate of 4-8%, be warming up to 70-80 DEG C, 4000-5000rpm speed lapping 15-20min, and then add the emulsifier op-10 being equivalent to slurry weight 2-3%, the polyvinylpyrrolidone of 5-10%, the sodium carboxymethyl starch of 4-6%, stir, be warming up to 80-90 DEG C, add the vinyl acetate being equivalent to slurry weight 40-50% again, the methacrylic acid of 10-15%, the butyl acrylate of 20-30%, the ammonium persulfate of 1-2%, stirring reaction 0.5-1h, filter, dry.
2. the cast steel according to claim 1 preparation method of high refractory molding sand, is characterized in that comprising the following steps:
(1) nice foundry sand, sludge dry powder, natural manganese sand, modified alta-mud, alum powder, carboxymethyl cellulose, beryllium oxide are dry mixed 15-25s, then add the water wet mixing 3-4min accounting for mixture weight 1.5-2.5%, obtain slurry A;
(2) tufa stone and dickite are mixed, pulverize, add alumina cement, nacrite, flake asbestos, aluminium dihydrogen tripolyphosphate, sodium metasilicate, polyethylene glycol after crossing 100-150 mesh sieve, be dry mixed 10-15s, account for the water wet mixing 1-3min of mixture weight 1-2%, obtain slurry B;
(3) slurry A is put into puddle mixer together with slurry B, then add corn syrup, tung oil, mixing 0.5-1h.
CN201510152146.2A 2015-04-01 2015-04-01 Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand Pending CN104801656A (en)

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105057565A (en) * 2015-08-19 2015-11-18 合肥市田源精铸有限公司 High-quality molding sand and preparation method thereof
CN105127359A (en) * 2015-08-19 2015-12-09 合肥市田源精铸有限公司 High-thermal-stability sand
CN105478655A (en) * 2015-12-31 2016-04-13 安徽创奇乐智能游乐设备有限公司 Knar clay moulding sand prevented from adhering to casting and preparation method of knar clay moulding sand
CN105478654A (en) * 2015-12-31 2016-04-13 安徽创奇乐智能游乐设备有限公司 High-strength and high-temperature-resistance molding sand and preparation method thereof
CN105478656A (en) * 2015-12-31 2016-04-13 安徽创奇乐智能游乐设备有限公司 High-green-compression-strength green moulding sand for iron casting and preparation method of high-green-compression-strength green moulding sand
CN105537505A (en) * 2016-02-15 2016-05-04 芜湖市金贸流体科技股份有限公司 Good-plasticity easy-to-mold molding sand for sluice valve and preparation method thereof
CN105537504A (en) * 2016-02-15 2016-05-04 芜湖市金贸流体科技股份有限公司 Clay green sand applied to carbon steel castings and preparation method of clay green sand
CN105562585A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 High-breaking-resistance recycle clay molding sand and preparing method thereof
CN105562581A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 Low-gas-evolution-amount high-fire-resistance clay molding sand used for casting and preparation method thereof
CN105562584A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 Easily-collapsing molding sand for aluminum alloy castings and preparing method for easily-collapsing molding sand
CN105562583A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 High-fluidity clay green molding sand used for steel casting and preparation method thereof
CN105903887A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 High-performance green sand
CN105903890A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 Easily-collapsing green sand
CN105964878A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 High-gas-permeability wet molding sand used for gray iron casting and manufacturing method thereof
CN105964877A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 Molding sand prepared by utilizing zirconium silicon residues and a preparing method thereof
CN105964880A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 Foundry sand containing walnut shell grit and manufacturing method thereof
CN105964926A (en) * 2016-02-18 2016-09-28 蚌埠市鸿安精密机械有限公司 Modified nacrite water-soluble mold core and preparation method thereof
CN105964879A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 Clay molding sand containing brine sludge and a manufacturing method thereof
CN105983644A (en) * 2015-12-31 2016-10-05 安徽创奇乐智能游乐设备有限公司 Molding sand for high-density models and preparation method of molding sand
CN105983645A (en) * 2015-12-31 2016-10-05 安徽创奇乐智能游乐设备有限公司 High-refractoriness and low-expansion molding sand for steel castings and preparation method of molding sand
CN106926453A (en) * 2017-03-06 2017-07-07 济南大学 A kind of method that laser sintered 3D printing precoated sand is prepared for adhesive with sugar
CN110681817A (en) * 2019-09-29 2020-01-14 含山县能华铸造有限公司 Preparation method of binder for pig iron investment casting

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127359A (en) * 2015-08-19 2015-12-09 合肥市田源精铸有限公司 High-thermal-stability sand
CN105057565A (en) * 2015-08-19 2015-11-18 合肥市田源精铸有限公司 High-quality molding sand and preparation method thereof
CN105562583A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 High-fluidity clay green molding sand used for steel casting and preparation method thereof
CN105478655A (en) * 2015-12-31 2016-04-13 安徽创奇乐智能游乐设备有限公司 Knar clay moulding sand prevented from adhering to casting and preparation method of knar clay moulding sand
CN105478654A (en) * 2015-12-31 2016-04-13 安徽创奇乐智能游乐设备有限公司 High-strength and high-temperature-resistance molding sand and preparation method thereof
CN105478656A (en) * 2015-12-31 2016-04-13 安徽创奇乐智能游乐设备有限公司 High-green-compression-strength green moulding sand for iron casting and preparation method of high-green-compression-strength green moulding sand
CN105983645A (en) * 2015-12-31 2016-10-05 安徽创奇乐智能游乐设备有限公司 High-refractoriness and low-expansion molding sand for steel castings and preparation method of molding sand
CN105562585A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 High-breaking-resistance recycle clay molding sand and preparing method thereof
CN105562581A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 Low-gas-evolution-amount high-fire-resistance clay molding sand used for casting and preparation method thereof
CN105562584A (en) * 2015-12-31 2016-05-11 安徽创奇乐智能游乐设备有限公司 Easily-collapsing molding sand for aluminum alloy castings and preparing method for easily-collapsing molding sand
CN105983644A (en) * 2015-12-31 2016-10-05 安徽创奇乐智能游乐设备有限公司 Molding sand for high-density models and preparation method of molding sand
CN105537504A (en) * 2016-02-15 2016-05-04 芜湖市金贸流体科技股份有限公司 Clay green sand applied to carbon steel castings and preparation method of clay green sand
CN105537505A (en) * 2016-02-15 2016-05-04 芜湖市金贸流体科技股份有限公司 Good-plasticity easy-to-mold molding sand for sluice valve and preparation method thereof
CN105964926A (en) * 2016-02-18 2016-09-28 蚌埠市鸿安精密机械有限公司 Modified nacrite water-soluble mold core and preparation method thereof
CN105964878A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 High-gas-permeability wet molding sand used for gray iron casting and manufacturing method thereof
CN105964877A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 Molding sand prepared by utilizing zirconium silicon residues and a preparing method thereof
CN105964880A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 Foundry sand containing walnut shell grit and manufacturing method thereof
CN105964879A (en) * 2016-03-10 2016-09-28 繁昌县琪鑫铸造有限公司 Clay molding sand containing brine sludge and a manufacturing method thereof
CN105903890A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 Easily-collapsing green sand
CN105903887A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 High-performance green sand
CN106926453A (en) * 2017-03-06 2017-07-07 济南大学 A kind of method that laser sintered 3D printing precoated sand is prepared for adhesive with sugar
CN106926453B (en) * 2017-03-06 2019-04-23 济南大学 A method of laser sintered 3D printing precoated sand is prepared for adhesive with sugar
CN110681817A (en) * 2019-09-29 2020-01-14 含山县能华铸造有限公司 Preparation method of binder for pig iron investment casting
CN110681817B (en) * 2019-09-29 2021-02-26 含山县能华铸造有限公司 Preparation method of binder for pig iron investment casting

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Application publication date: 20150729