CN104150924A - Thermal insulation exothermic riser sleeve prepared from recovered material of investment casting used shell powder, and preparation method thereof - Google Patents
Thermal insulation exothermic riser sleeve prepared from recovered material of investment casting used shell powder, and preparation method thereof Download PDFInfo
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- CN104150924A CN104150924A CN201410377968.6A CN201410377968A CN104150924A CN 104150924 A CN104150924 A CN 104150924A CN 201410377968 A CN201410377968 A CN 201410377968A CN 104150924 A CN104150924 A CN 104150924A
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Abstract
The invention relates to a thermal insulation exothermic riser sleeve. The thermal insulation exothermic riser is prepared through the following steps: firstly, recycling investment casting used shell powder for sorting, dehydrating, deironing, primary smashing and processing into particles, and then the particles being subjected to screening and secondary deironing so as to obtain oversize particles and downsize particles, classifying and processing the oversize particles and the downsize particles, and obtaining fire-proof aggregate meeting the manufacturing requirement of the riser sleeve; secondly, using the investment casting used shell powder to prepare the thermal insulation exothermic riser sleeve. According to the invention, the utilization rate of metal is increased greatly, the production cost is lowered, and the casting quality is improved; moreover, test results show that after a casting is solidified, the capacity of an ordinary sand riser feeding casting ranges from 6% to 10%, the capacity of a thermal insulation riser feeding casting ranges from 16% to 20%, and the casting feeding capacity of the exothermic riser provided by the invention is increased to 30% to 36%.
Description
Technical field
The present invention relates to a kind of insulating and heating riser cover and preparation method thereof, utilize and reclaim the old shell material making of investment cast insulating and heating riser cover.It is the old shell of the investment cast of recovery to be made to aggregate be used further to make insulating and heating riser cover, has solved the discarded shell material of investment cast and has directly discharged, contaminate environment, the drawback of land occupation.
Background technology
In castings production process, liquid metal is poured into after casting mold, and liquid contraction occurs in process of cooling, if this contraction can not get compensation, will be in the inner defects such as shrinkage cavity or shrinkage porosite that produce of foundry goods after solidifying, this will have influence on compactness, the reduction mechanical property of foundry goods, and causes waste product.
In order to obtain sound foundry goods, in actual production, at the position of foundry goods final set, rising head is set foundry goods is carried out to feeding, play the effect that prevents shrinkage cavity and porosity, exhaust and collection slag.Along with the development of foundry engieering and improving constantly that casting quality is required, insulation is bad or heating is not enough and act on the shortcomings such as single owing to existing for the sand mold riser buss of traditional technology, the insulating riser sleeve having adopted or exothermic riser sleeve, can not meet the feeding requirement of foundry goods, therefore, development of new insulating and heating riser cover is more and more subject to foundry goods worker's attention.Traditional Steel Casting Risers is sand mold, its thermal conductivity is the same with casting mold, this just requires Riser Dimensions more much bigger than the foundry goods thermal center size of required feeding, and the liquid volume that rising head really supplements to foundry goods is 6%～10%, so the consumption of rising head itself also can not be ignored.Research shows, after casting solidification, the ability of normal sands riser feeding foundry goods is 6%～10%, and the ability of insulated feeder feeding foundry goods is 16%～20%, and the feeding a casting ability of heat preservation rising head is increased to 30%～36%.
Insulating riser sleeve refers to the riser buss being mainly prepared from by lagging material, its action principle is to utilize the heat accumulation function of low thermal conductivity lagging material to reduce the thermosteresis of riser buss inner metal liquid, thereby the setting time that extends riser buss inner metal liquid, improves its feeding capacity to foundry goods.The chief component of insulating riser sleeve generally comprises, lagging material, refractory aggregate, binding agent and some additional materials etc.Selecting of composition material should be followed the principles such as recovery that source is wide, nontoxic, free from environmental pollution, do not affect molding material.
The refractory materials majority of rising head is quartz sand on the market now, adds a small amount of pearl that floats, and is totally that rising head is bigger than normal, lays particular stress on, and has also increased user's cost.And the heat-insulating property of quartz sand not as mullite good, tap density is greater than discarded shell material more than one times.Even if other situations are constant in other words, use mullite to replace quartz sand rising head, at least save half cost of user.Float pearl, its density is very little, boring, and heat insulation property is best.But recovery rate is very little, particularly, after total utilization of PCA, be difficult to independent collection, volcanic ash also can, but China is also difficult to collect.
In general steel casting rising head, weight of liquid metal is no better than the weight of foundry goods own.Just discarded after rising head is used, then the metal of rising head the inside also will cut away.Just can obtain the general shape of part, through ball blast, polishing, flaw detection, repair welding, the techniques such as thermal treatment, obtain satisfactory foundry goods.Owing to needing the electricity of 700 degree left and right in steel casting fusion process per ton, mean half molten steel waste or melt back, and a lot of metal comprises that alloy can be burnt.So, reduce Riser Dimensions, by improving the performance of insulated feeder, effectively power cost saving and metal loss.Reduce power consumption and also just mean the discharge that reduces carbonic acid gas, energy-conserving and environment-protective.
According to pertinent data introduction, annual about 1,500 ten thousand tons to 2,000 ten thousand tons of the discarded shell material of the investment cast whole nation.At present, for the processing of these old shells, most enterprises take direct discharge, abandon or landfill, pollute environment, land occupation.Main mullite in the old shell powder of investment cast, the value of aluminum oxide is far longer than quartz sand, so manufacturers generally manufactures rising head without mullite, is nearly all to take quartz sand as main manufacture rising head.We consider to use discarded shell material to manufacture rising head, user can obtain following material benefit: rising head density is little, reduce purchase cost, high insulating effect, reduces Riser Dimensions, saves molten steel, namely power cost saving and burning loss of alloy, after rising head is discarded, as reclaiming sand, can effectively improve quartz sand performance, reduce acid atmosphere.Our cost recovery is exactly freight charges and processing cost, reaches the granularity of manufacturing rising head requirement, only 350 yuan of per ton costs.Manufacture insulating and heating riser, only 800 yuan of costs, 2500 yuan of sale price of market are per ton.
In view of above background, we develop and utilize the old shell material of recycling investment cast to make rising head.
Summary of the invention
The object of the invention is to utilize the old shell material of recovery investment cast to prepare insulating and heating riser cover.
For realizing above object, technical solution of the present invention is:
The old shell returns of a kind of investment cast insulating and heating riser cover and preparation method thereof, comprises the following steps:
The first step: reclaim the old shell powder of investment cast: by sorting, anhydrate, deironing, primary fragmentation, is processed into particulate material, again through screening, secondary deironing, obtains screen overflow and screen underflow, to the processing of classifying of screen overflow and screen underflow, obtain to meet and make the refractory aggregate that riser buss is used, the step of employing is:
1, sorting
The old shell reclaiming is sorted, remove impurity.
Investment casting enterprise, in shell processed (casting mold) process, will be hung slurries and powder four to five times conventionally, just can complete shell processed.Basic technological process is: wax-pattern-sprayed silicon colloidal sol-extension zirconium white (or aluminum oxide)-oven dry (above for every one deck)-be stained with slurries-extensions zircon sand (or aluminum oxide)-oven dry (being the second layer above)-be stained with slurries-extension mullite fine particle-oven dry (being the 3rd layer above)-be stained with slurries-extension mullite coarse particles-oven dry (being the 4th layer-hanging fluid-tight slurry-oven dry-autoclave dewaxing above).What can use by above-mentioned the first layer and the second layer is that zirconium white or aluminum oxide sort, and sorting can adopt manual sorting;
2, anhydrate
To old shell processings of anhydrating through classification, the old shell through classification to be entered to bake oven and does, temperature is controlled in 150 ℃, removes nature moisture; Or by the old shell natural drying through classification, water content is controlled at 4% can meet service requirements with interior.
3, deironing, primary fragmentation, is processed into particulate material
The old shell of processing through water past is carried out to deironing, primary fragmentation processing, make the old shell of processing through water past by the magnetic roller deironing on travelling belt, then send into crusher in crushing, be processed into particulate material;
4, after broken, the particulate material that is processed into, send into linear vibrating screen screening, carry out secondary iron removal by magnetic separation simultaneously; After screening and secondary iron removal by magnetic separation, obtain screen overflow one and screen underflow; Screen overflow order number is less than 30 orders, and screen underflow order number is 30-80 order;
5, refractoriness detects; Obtained particulate material is carried out to refractoriness detection;
6, classification is processed
To the processing of classifying of screen overflow and screen underflow, obtain and meet particulate material that following order number and refractoriness require as the refractory aggregate of manufacturing insulating and heating riser cover:
For the preparation of the particulate material of steel casting insulating and heating riser cover used, its refractoriness requires to be greater than 1500 ℃, and order number is 30 order-80 orders;
For the preparation of the particulate material of ironcasting insulating and heating riser cover used, its refractoriness should be greater than 1300 ℃, and order number is 30-80 order;
For the preparation of the particulate material of aluminum casting insulating and heating riser cover used, its refractoriness should be greater than 800 ℃, and order number is 16-30 order.
Second step, with the old shell preparation of the investment cast insulating and heating riser cover reclaiming
Method one: the refractory aggregate that the first step is obtained, perlite, silica flour, fireclay, resol, thermite, water join in mixer and fully mixes, obtain the mixed wet feed making, then wet feed is filled in mould, the pre-consolidation in wet feed limit is filled on limit, and then compression moulding, the demoulding are dried and obtained insulating and heating riser cover.The ratio of refractory aggregate, perlite, silica flour, fireclay, resol, water is: 60-80:10-20:10-20:5-10:5-10:10-20.Mixer mixing time: 5-8 minute.Bake out temperature 200-300 ℃, drying time 2-3 hour.
Method two: refractory aggregate, perlite, waste foam, water glass, thermite, water are joined to mixer with the ratio of 70:20:12.5:25:8.5:2 respectively can be mixed, the material being mixed uniformly is filled in mould, add slotting ventilating pit, passing into carbonic acid gas hardens, after the demoulding, under state of nature or sunlight, further dewater and dry again, to remove, emit the moisture in product, guarantee to emit moisture to be no more than 1%, obtain qualified product.
3. the comparison of the riser buss technology properties of unlike material
The performance index of common several types insulating riser sleeve and application characteristic
The present invention can improve the utilization ratio of metal greatly, reduces production costs, and improves casting quality.Test shows, after casting solidification, the ability of normal sands riser feeding foundry goods is 6%～10%; The ability of insulated feeder feeding foundry goods is 16%～20%; And the feeding a casting ability of heat preservation rising head of the present invention is increased to 30%～36%.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation
Embodiment 1: the old shell returns of a kind of investment cast is prepared insulating and heating riser cover and method thereof, comprises the following steps:
The first step:
1, sorting
The old shell reclaiming is sorted, remove impurity.Investment casting enterprise, in shell processed (casting mold) process, will be hung slurries and powder four to five times conventionally, just can complete shell processed.Basic technological process is: wax-pattern-sprayed silicon colloidal sol-extension zirconium white (or aluminum oxide)-oven dry (above for every one deck)-be stained with slurries-extensions zircon sand (or aluminum oxide)-oven dry (being the second layer above)-be stained with slurries-extension mullite fine particle-oven dry (being the 3rd layer above)-be stained with slurries-extension mullite coarse particles-oven dry (being the 4th layer-hanging fluid-tight slurry-oven dry-autoclave dewaxing above).What by above-mentioned the first layer and the second layer, use is that zirconium white or aluminum oxide sort, and sorting adopts manual sorting.
2, anhydrate
To old shell processings of anhydrating through classification, the old shell through classification to be entered to bake oven and does, temperature is controlled in 150 ℃, removes nature moisture; Or by the old shell natural drying through classification, water content is controlled at 4% can meet service requirements with interior.
3, deironing, primary fragmentation, is processed into particulate material
The old shell of processing through water past is carried out to deironing, primary fragmentation processing, make the old shell of processing through water past by the magnetic roller deironing on travelling belt, then send into crusher in crushing, be processed into particulate material;
4, after broken, the particulate material that is processed into, send into linear vibrating screen screening, carry out secondary iron removal by magnetic separation simultaneously; After screening and secondary iron removal by magnetic separation, obtain screen overflow one and screen underflow; Screen overflow order is counted 16-30 order (not containing 30 orders), and screen underflow order number is 30-80 order;
Second step, with the old shell preparation of the investment cast insulating and heating riser cover reclaiming
Getting order number is that 16-30 order 60Kg reclaims the old shell particulate material of investment cast, 10Kg perlite, 10Kg silica flour, 5Kg fireclay, 5Kg resol: 10, thermite 5Kg, water join in mixer, fully mix mixer mixing time: 5-8 minute.Obtain the mixed wet feed making, then wet feed is filled in mould, the pre-consolidation in wet feed limit is filled on limit, and then compression moulding, the demoulding are dried, bake out temperature 200-300 ℃, and drying time 2-3 hour, obtains aluminum casting insulating and heating riser cover used.
The aluminum casting insulating and heating riser cover main performance index preparing is:
1, density: 0.60g/cm
3; 2, refractoriness:>=800 ℃; 3, thermal conductivity: 0.25kcal/ (mh ℃); 4, folding strength: 1.5MPa; 5, sand removal and environmental pollution, riser buss Automatic-falling, pollution-free; 6, product yield 75%; .
Embodiment 2:
With embodiment 1, asynchronous: second step: the old shell particulate material of investment cast, 20Kg perlite, 20Kg silica flour, 10Kg fireclay, 10Kg resol that 80Kg reclaims: 20Kg water.
The aluminum casting insulating and heating riser cover main performance index preparing is:
1, density: 0.80g/cm
3; 2, refractoriness:>=800 ℃; 3, thermal conductivity: 0.20kcal/ (mh ℃); 4, folding strength: 2.5MPa; 6, product yield 70%.
Embodiment 3:
With embodiment 1, different: second step: refractory aggregate, perlite, waste foam, water glass, thermite (mixture that aluminium and ferric oxide part by weight are 1:2.95), water are joined to mixer with the ratio of 75kg:22.5kg:8.5kg:24.5kg:8.5kg:2kg respectively can be mixed, the material being mixed uniformly is filled in mould, add slotting ventilating pit, pass into carbonic acid gas and harden, after the demoulding, under state of nature or sunlight, further dewater and dry again.
The steel casting insulating and heating riser cover main performance index preparing is:
1, density: 0.7g/cm
3; 2, refractoriness:>=1500 ℃; 3, thermal conductivity: 0.23kcal/ (mh ℃); 4, folding strength: 2.0MPa; 5, product yield 73%.
Embodiment 4:
With embodiment 1, different: getting order number is that 30-80 object reclaims the old shell particulate material of investment cast.
The ironcasting insulating and heating riser cover main performance index preparing is: 1, density: 0.7g/cm
3; 2, refractoriness:>=1300 ℃, 3, thermal conductivity: 0.23kcal/ (mh ℃); 4, folding strength: 2.0MPa; 5, product yield 73%.
Embodiment 5:
With embodiment 1, different: getting order number is that 30-180 object reclaims the old shell particulate material of investment cast.
The steel casting insulating and heating riser cover main performance index preparing is:
1, density: 0.80g/cm
32, refractoriness:>=1500 ℃, 3, thermal conductivity: 0.24kcal/ (mh ℃); 4, folding strength: 2.2MPa; 5, product yield 71%.
Embodiment 6:
With embodiment 2, different: getting order number is that 30-80 object reclaims the old shell particulate material of investment cast.
The steel casting insulating and heating riser cover main performance index preparing is:
1, density: 0.80g/cm
3; 2, refractoriness:>=1500 ℃; 3, thermal conductivity: 0.20kcal/ (mh ℃); 4, folding strength: 2.5MPa; 6, product yield 70%.
Embodiment 7: with embodiment 3, different: getting order number is that 30-80 object reclaims the old shell particulate material of investment cast.
The steel casting insulating and heating riser cover main performance index preparing is:
1, density: 0.7g/cm
3; 2, refractoriness:>=1500 ℃; 3, thermal conductivity: 0.23kcal/ (mh ℃); 4, folding strength: 2.0MPa; 6, product yield 73%.
Claims (4)
1. the old shell returns of investment cast is prepared a method for insulating and heating riser cover, comprises the following steps:
The first step: reclaim the old shell powder of investment cast;
By sorting, anhydrate, deironing, primary fragmentation, be processed into particulate material, then through screening, secondary deironing, obtain screen overflow and screen underflow, to the processing of classify of screen overflow and screen underflow, obtain and meet the refractory aggregate that making riser buss is used, the step of employing is:
1) sorting
The old shell reclaiming is sorted, remove impurity;
2) anhydrate
To old shell processings of anhydrating after sorting, old shell to be entered to bake oven and do, temperature is controlled in 150 ℃, removes nature moisture, or by old shell natural drying, water content is controlled in 4%;
3) deironing, primary fragmentation, is processed into particulate material
The old shell of processing through water past is carried out to deironing, primary fragmentation processing, make the old shell of processing through water past by the magnetic roller deironing on travelling belt, then send into crusher in crushing, be processed into particulate material;
4) screening, secondary deironing
Particulate material is sent into linear vibrating screen screening, carry out secondary iron removal by magnetic separation simultaneously; After screening and secondary iron removal by magnetic separation, obtain screen overflow one and screen underflow; Screen overflow order number is greater than 30 orders, and screen underflow order number is 30-80 order;
5) refractoriness detects; Obtained particulate material is carried out to refractoriness detection;
6) classification is processed
To the processing of classifying of screen overflow and screen underflow, obtain and meet particulate material that following order number and refractoriness require as the refractory aggregate of manufacturing insulating and heating riser cover:
For the preparation of the particulate material of steel casting insulating and heating riser cover used, its refractoriness requires to be greater than 1500 ℃, and order number is 30 order-80 orders;
For the preparation of the particulate material of ironcasting insulating and heating riser cover used, its refractoriness should be greater than 1300 ℃, and order number is 30-80 order;
For the preparation of the particulate material of aluminum casting insulating and heating riser cover used, its refractoriness should be greater than 800 ℃, and order number is 16-30 order;
Second step, prepares insulating and heating riser cover by the old shell particulate material of investment cast reclaiming.
2. method according to claim 1, it is characterized in that: second step is prepared insulating and heating riser cover by the old shell particulate material of investment cast reclaiming and referred to: the refractory aggregate that the first step is obtained, add perlite, silica flour, fireclay, thermite, resol and water fully to mix in mixer, obtain the mixed wet feed making, then wet feed is filled in mould, the pre-consolidation in wet feed limit is filled on limit, and then compression moulding, the demoulding are dried and obtained insulating and heating riser cover;
The ratio of refractory aggregate, perlite, silica flour, fireclay, resol and water is: 60-80:10-20:10-20:5-10:5-10:10-20; Mixer mixing time: 5-8 minute; Bake out temperature 200-300 ℃, drying time 2-3 hour.
3. method according to claim 1, it is characterized in that: second step is prepared insulating and heating riser cover by the old shell particulate material of investment cast reclaiming and referred to: by refractory aggregate, perlite, waste foam, water glass, thermite joins mixer with the ratio of 60-75:20-25:10-15:25-30:5-10:1-2 respectively and mixes, the material being mixed uniformly is filled in mould, add slotting ventilating pit, passing into carbonic acid gas hardens, after the demoulding, under state of nature or sunlight, further dewater and dry again, to remove the moisture in rising head, the moisture that guarantees rising head is no more than 1%, obtain insulating and heating riser cover.
4. by method described in claim 1 or 2 or 3, make and obtain insulating and heating riser cover.
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| CN201410377968.6A CN104150924B (en) | 2014-07-31 | 2014-07-31 | A kind of model casting legacy shell returns insulating and heating riser set and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608236A (en) * | 2019-01-08 | 2019-04-12 | 广东山摩新材料科技有限公司 | Silica silicon carbide refractory slab antioxidant coating and its application method |
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| CN101279363A (en) * | 2008-05-15 | 2008-10-08 | 中国科学院金属研究所 | Method for inhibiting segregation in large-sized steel ingot |
| CN101433944A (en) * | 2008-12-19 | 2009-05-20 | 洛阳双瑞特种装备有限公司 | High-efficient exothermic riser sleeve for casting |
| CN102951916A (en) * | 2012-11-23 | 2013-03-06 | 柳薇 | Refractory aggregate for refractory brick manufactured through recycling investment casting old shell powder and processing method thereof |
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2014
- 2014-07-31 CN CN201410377968.6A patent/CN104150924B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279363A (en) * | 2008-05-15 | 2008-10-08 | 中国科学院金属研究所 | Method for inhibiting segregation in large-sized steel ingot |
| CN101433944A (en) * | 2008-12-19 | 2009-05-20 | 洛阳双瑞特种装备有限公司 | High-efficient exothermic riser sleeve for casting |
| CN102951916A (en) * | 2012-11-23 | 2013-03-06 | 柳薇 | Refractory aggregate for refractory brick manufactured through recycling investment casting old shell powder and processing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109608236A (en) * | 2019-01-08 | 2019-04-12 | 广东山摩新材料科技有限公司 | Silica silicon carbide refractory slab antioxidant coating and its application method |
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