CN103611921B - The production method of skimming tool - Google Patents
The production method of skimming tool Download PDFInfo
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- CN103611921B CN103611921B CN201310644765.4A CN201310644765A CN103611921B CN 103611921 B CN103611921 B CN 103611921B CN 201310644765 A CN201310644765 A CN 201310644765A CN 103611921 B CN103611921 B CN 103611921B
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- cooling water
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Abstract
The invention discloses a kind of production method of skimming tool, in copper water, add slag forming agent and Antaciron block; Cooling water pipe is put into cast model, by liquid cold medium and composite solid cooling medium in cooling water pipe; By copper water cast cooling plate base body, the middle part of cooling water pipe is cast in matrix; Allow in casting process and pour into a mould model accumbency, rising head lays particular stress on side moulding, by padded for model rising head side after model mould assembling; Adopt upper and lower two-layer ingate to carry out ladder cast, form consecutive solidification.Cooling water pipe can be effectively avoided to be out of shape in casting process or local burn through; Avoid producing air gap between cooling plate base body and cooling water pipe; Avoid complete remelting and perfect recrystallization occur, accurately realize the micro-molten of cooling water pipe outer surface, improve the cooling effect of coldplate; Enhance the mechanical performance of Copper substrate; Reduce the temperature on the resistance to material surface of skimming tool, indirectly reduce the temperature of skimming tool Service Environment, improve skimming tool service life.
Description
Technical field
The present invention relates to a kind of production method of skimming tool, specifically relate to a kind of cooling device being applied to metallurgy industry, belong to iron and steel metallurgical industry technical field.
Background technology
Skimming tool promotes the effective device be separated of high-temperature liquid furnace slag (1400-1500 DEG C) in blast furnace casting process, molten iron (1400-1600 DEG C).Skimming tool connects main trough of blast furnace, under connect iron runner, bypass connects slag runner, and cast house is in core node position, is also the exclusive node ensureing that slag iron is effectively separated, to blast furnace casting process stable, direct motion is very important.From broadly, skimming tool is by front groove, Sha Ba, baffle plate (being also called lintel or large lock), passageway, The Small Well (molten iron exports, and connects the Zhigou flowing to hot-metal bottle) and put residual iron duct and form.Current, many scholars by baffle plate referred to as skimming tool.The chief component of skimming tool is the refractory material of different performance and the high temperature box hat in outside of inner side.Skimming tool is subject to the chemical erosion with slag of washing away of high temperature liquid iron for a long time, and its Service Environment is very severe.
In actual production process, skimming tool is suspended in the sow being filled with liquid slag and molten iron, has a passage, namely above-mentioned passageway bottom it and between sow, and the slag in sow and molten iron are because of different (the density 3.0t/m of slag of its density
3, the density 7.0t/m of molten iron
3), natural layering.For slag, float over because density is little above molten iron, blocked rear by skimming tool then flow to slag runner; For molten iron, below density sinks to greatly, by the gap (passageway namely mentioned above) between skimming tool and sow, iron runner can be flowed to.Accordingly, skimming tool completes the slag of high-temperature liquid state, the shunting of molten iron.
In blast furnace casting process, skimming tool is related to stable, the direct motion of blast furnace operating, very important in the effect of blast furnace ironmaking process, and skimming tool, under arms in process, mainly stands the sustaining breakdown of following several factor: the mechanical erosion of (1) high temperature liquid iron; (2) slag chemistry under hot conditions corrodes; (3) blast furnace intermittent tapping, the thermal shock that causes when slagging tap are corroded.Three kinds of factor alternating actions, strengthen mutually, greatly reduce the service life of skimming tool.But along with the development of modern blast furnace technology, blast furnace presents obvious the Enlargement Tendency, tap a blast furnace, the time of slagging tap constantly extends, along with the mechanical erosion continued under hot conditions and chemical erosion, the Service Environment of skimming tool worsens further, exacerbates the destruction of skimming tool.When daily blast furnace flushing and casting, often directly have influence on blast fumance because skimming tool work is abnormal, upset the normal rhythm of production of blast furnace.Because skimming tool service life does not reach requirement, cause stokehold technique damping down asynchronous with facilities plan damping down, cause without plan delay ratio high, consume high, yield poorly, therefore the technological improvement of skimming tool is become to the most important thing of blast furnace.
The main forms of skimming tool damage be baffle plate bottom wash away erosions, middle resistance to material ftractures.Until after the bottom of baffle plate washed away in a large number, slag from cracking by and enter into follow-up trough, lose skimming function.For avoiding this situation, scene needs to keep in repair skimming tool frequently, has both added cost of labor, Material Cost, also limit furnace processor, causes larger economic loss to ironmaking enterprise.How to improve the skimming tool life-span further, become the urgent technical barrier that vast ironmaking worker faces.
In view of the analysis to skimming tool Service Environment, its maximum destructive factor can ascribe 2 points to: (1) high temperature.Hot conditions and consequent thermal stress are to the sustaining breakdown of resistance to material, and the easy recurring structure of resistance to material peels off, the service life continuing to peel off jeopardizing resistance to material of resistance to material.On the other hand, when high temperature interval occurs, corrode forming strong thermal shock to skimming tool, accelerate peeling off of the resistance to material of skimming tool; (2) chemical erosion.Because slag composition is similar to resistance to material component, according to " similar mix " principle, material is in the process that slag contacts, the chemical substance of easy generation low melting point, the chemical substance of low melting point liquefies rapidly when high temperature furnace slag washes away and enters slag, and resistance to material now there occurs " melting loss " reaction, the carrying out that hot environment has impelled melting loss to react further, along with melting loss reaction continues to carry out, the process of chemical attack of resistance to material continues to occur.Thus, the key issue improving the skimming tool life-span should be reduce the temperature of its Service Environment, but means of effectively lowering the temperature not yet taked by existing skimming tool, not yet find the effective measures reducing its Service Environment temperature.
In view of the analysis to skimming tool Service Environment and failure mechanism, propose the corrective measure extending the skimming tool life-span: the mode of taking to force cooling to the resistance to material of skimming tool, reduce the temperature of the resistance to material Service Environment of skimming tool.After the temperature of resistance to material reduces, can thermal stress be effectively reduced, and " thermal shock " effect caused thus, and then extend skimming tool service life.Simultaneously, also above-mentioned chemical erosion problem is solved, when the resistance to material generation chemical reaction of slag and skimming tool, the low melting point formed, the slag do not reacted with resistance to material is also cooled simultaneously, based on the conversion zone that chemical change occurs, slag is firmly adhered on resistance to material, define the diaphragm of half curdled appearance of one deck densification, diaphragm poor thermal conductivity, completely cut off direct contact of high temperature furnace slag and the resistance to material of skimming tool, skimming tool can be protected from high temperature erosion, under low-temperature condition, chemical reaction rate reduces greatly, reduce the chemical erosion of slag and resistance to material.
By taking the mode of installing cooler to skimming tool; strengthening cooling is carried out to the resistance to material of skimming tool; directly can reduce the temperature of the resistance to material of skimming tool; impel the slag generation condensation on resistance to material surface; form the protection putamina of half curdled appearance of one deck densification; one " self-shield " layer is formed to resistance to material, and then extender service life.The main cast iron quality of traditional cooler and fine copper material.But, current most popular spheroidal graphite cast-iron coldplate has the following disadvantages: (1) spheroidal graphite cast-iron casting coldplate must smear anti-carburization coating outside cooling duct, make to form air gap between passage and matrix, and air gap makes cooling wall heat transmission resistance increase by more than 1000, worsen heat-transfer effect, increase coldplate working face temperature, the breakage of accelerating cooling wall; (2) spheroidal graphite cast-iron matrix has been covered with the globular graphite (particle diameter 0.025 ~ 0.150mm) varied in size, will a large amount of small holes have been formed after globular graphite is oxidized, define the inducement that crack and crackle occur, reduce coldplate service life; (3) when casting large-scale spheroidal graphite casting, C, S, P are easily pushed to liquid zone in column crystallization process, form a segregation thing enrichment region, facilitate generation and the expansion of matrix cracking in Center Equiaxial Crystal district, are unfavorable for improving the coldplate life-span; (4) when temperature is greater than 709 DEG C, will there is irreversible transition in the matrix of spheroidal graphite cast-iron, the coefficient of expansion and internal stress sharp increase, and its damaged speed is accelerated; (5) spheroidal graphite cast-iron thermal conductivity and thermal shock resistance poor, its thermal conductivity factor is only 30wm
-2k
-1, be unfavorable for the high efficiency cooling of cooling wall.But, when the matrix of coldplate and cooling water pipe all adopt metallic copper, also exist following not enough: (1) cooling water pipe also adopts metallic copper, has raised production cost further; (2) easily there is burn through and distortion in copper cooling water pipe in casting process, and production process yield rate is low; (3) Copper substrate is in actual use because intensity is low, in expanded by heating repeatedly, deformation process, easily damaged, and then leakage accident occurs, and causes potential safety hazard.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of production method of skimming tool, skimming tool is composited by bimetallic, mainly comprise cooling plate base body and cooling water pipe, coldplate by oxygen-free copper material as cooling plate base body, by the steel pipe through rolling as cooling water pipe, Copper substrate and cooling water pipe one-step casting shaping.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of production method of skimming tool, it is characterized in that, described skimming tool comprises cooling matrix and built-in cooling water pipe, cooling matrix is rectangular structure, the bottom surface of cooling matrix and two corresponding side surface uniform parallel are distributed with multiple prismatoid groove and form the fin of being convenient to dispel the heat, cooling water pipe along cooling intrinsic silicon repeatedly U-shaped bending arrange continuously, the water inlet of cooling water pipe and delivery port be all arranged on cooling matrix upper surface; Described cooling intrinsic silicon offers multiple through hole; Production method comprises the following steps:
(1), adopt intermediate frequency furnace copper smelting water, in copper smelting water latter stage, a point secondary adds slag forming agent, makes its uniform fold at copper water surface;
(2), before Tong Shui comes out of the stove, in induction furnace, disposable interpolation granularity is the Antaciron block of 30-40mm, and the mode adopting machinery to spray into is added;
(3), prepare composite solid cooling medium, after preparing, by composite solid cooling medium under atmospheric environment, carry out high temperature sintering, calcination temperature controls at 900-1300 DEG C, removes the adhesive sintering block into;
(4) liquid cooling medium of reusable edible, is equipped with;
(5), by the cooling water pipe through rolling put into cast model on request, at the two ends of cooling water pipe by the external high-pressure hydraulic pump of resistant to elevated temperatures flexible pipe, the pressure of high-pressure hydraulic pump is 5-15Mpa; Before the cast of copper water, in cooling water pipe, pass into the liquid cooling medium of circulation in advance, in copper water casting process, composite solid cooling medium is joined in the liquid cooling medium of circulation, to ensure that cooling water pipe surface is micro-molten;
(6), with the copper water adding Antaciron block pour into a mould cooling plate base body, be cast in cooling plate base body by the middle part of cooling water pipe, two ends are stretched out in matrix, control the copper water degree of superheat 40-80 DEG C of scope;
(7), in modeling process, allow and pour into a mould model accumbency, rising head lays particular stress on side moulding, by padded for model rising head side after model mould assembling, makes rigid flask become 10-15 degree with ground; In casting process, adopt upper and lower two-layer ingate to carry out ladder cast, two-layer ingate be spaced apart 10-50cm, the process of setting of controlled cooling model plate accordingly, impel its formed consecutive solidification;
(8), cool, lay down model, skimming tool is made.
The production method of described skimming tool, is characterized in that: composition and the mass percent of described Antaciron block are: rare earth element 15-20%, silicon 20-30%, iron 50-65%; Antaciron block additional proportion is 1-10kg/ ton copper water.
The production method of described skimming tool, is characterized in that: the component of described composite solid cooling medium and mass percent be, Cr
2o
3: 45-47%, SiO
2: 1-2%, CaO:0.5-1%, FeO:20-30%, MgO:10-15%, AL
2o
3: 10-20%, surplus is granularity 70-100 object carbon dust.
The production method of described skimming tool, is characterized in that: described composite solid cooling medium, and its addition is: 1-10kg/ ton copper water.
The production method of described skimming tool, is characterized in that: the raw material components of slag forming agent and mass percent are the SiO of the CaO of 30-50%, 10-30%
2, the AL of 4-10%, 15-25%Al
2o
3, the MgO of 10-15%.
The production method of described skimming tool, is characterized in that: described liquid cooling medium, and its flow velocity is 1-10m/s.
The cross section of described cooling water pipe is oval, and the minor axis of described ellipse and the length ratio of major axis are 0.5-0.7.
Beneficial effect: the production method of skimming tool provided by the invention, adopts the present invention can effectively avoid cooling water pipe to deform in casting process or burn through; Avoid producing air gap between cooling plate base body and cooling water pipe; Avoid cooling water pipe that complete remelting and perfect recrystallization occur in casting process, destroy the original rolling performance of cooling water pipe; Accurately realize the micro-molten of cooling water pipe outer surface, solve cooling water pipe burn through and inner surface problem of oxidation in casting process, extend the life-span of coldplate life-span and then prolongation blast furnace skimming tool, save production cost; Steel cooling water pipe and copper cooling plate base body are combined closely, improves the non-deformability of coldplate; Control solidi fication mode, realizes consecutive solidification, improves the mechanical performance of coldplate; Adopt the mode of bimetallic compound, enhance the mechanical performance of Copper substrate.Take the mode of carrying out forcing cooling to the resistance to material of skimming tool, three-dimensional three-dimensional cooling effect can be formed to the resistance to material of skimming tool, reduce the temperature on the resistance to material surface of skimming tool, indirectly reduce the temperature of skimming tool Service Environment, reduce high temperature and chemical erosion to the destruction of the resistance to material of skimming tool, improve skimming tool service life; Have the following advantages:
(1) skimming tool have employed Copper substrate, and compared with plain cast iron coldplate, the heat conductivility of copper is better.Improve the cooling capacity of coldplate on the whole, and then the use amount of cooling water can be reduced;
(2) the steel cooling water pipe through rolling is adopted, avoid cooling water pipe and easily burn through occurs in casting process, and the problem that yield rate is low (fusing point of copper is about 1083 DEG C, the fusing point of steel is about 1530 DEG C, so in casting process, when the steel pipe imbedded runs into liquid copper, burn through can not be there is);
(3) cooling water pipe and matrix one-step casting shaping, decrease welding process, improve production efficiency, reduce production cost;
(4) cooling water pipe adopts repeatedly bending mode, can form three-dimensional three-dimensional cooling effect to the resistance to material of skimming tool, reduces the temperature on the resistance to material surface of skimming tool, indirectly reduces the temperature of skimming tool Service Environment, thus extend its service life;
(5) Copper substrate there is multiple through hole, while guarantee matrix strength, decrease the consumption of metallic copper.
Accompanying drawing explanation
Fig. 1 and Fig. 2 is structural representation of the present invention.
In figure: cooling plate base body 1, cooling water pipe 2, fin 3, through hole 4.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As depicted in figs. 1 and 2, for a kind of skimming tool, comprise cooling matrix 1 and built-in cooling water pipe 2, described cooling matrix 1 is rectangular structure, the bottom surface of described cooling matrix and two corresponding side surface uniform parallel are distributed with multiple prismatoid groove and form the fin 3 of being convenient to dispel the heat, described cooling water pipe 2 along cooling matrix 1 inside repeatedly U-shaped bending arrange continuously, the water inlet of cooling water pipe 2 and delivery port be all arranged on cooling matrix upper surface; Described cooling intrinsic silicon offers multiple cuboid through hole 4; By oxygen-free copper as cooling plate base body, the built-in steel pipe through rolling of matrix is as cooling water pipe.
The production method of skimming tool of the present invention, comprise the following steps: (1) adopts intermediate frequency furnace to be smelted by copper billet for copper water, when the copper billet in stove is melted to " clear water " state completely, for smelting latter stage, the ratio adding 30-60kg slag forming agent according to copper water per ton adds slag forming agent to copper water surface, be divided into twice on average to add, twice joining day is separated by 1-3 minute;
The raw material components of slag forming agent and mass percent are the SiO of the CaO of 30-50%, 10-30%
2, the AL of 4-10%, 15-25%Al
2o
3, the MgO of 10-15%.
(2), before Tong Shui comes out of the stove, in induction furnace, disposable interpolation granularity is the Antaciron block of 30-40mm, the ratio of 1-10kg Antaciron block is added according to copper water per ton, the mode adopting machinery to spray into is added, alloy is avoided to swim on the slag forming agent of fusing, after alloy adds, leave standstill, wait to be cast;
The composition of Antaciron block and mass percent are: rare earth element 15-20%, silicon 20-30%, iron 50-65%.
(3), composite solid cooling medium is prepared, after preparing, by composite solid cooling medium under atmospheric environment, carry out high temperature sintering, calcination temperature controls at 900-1300 DEG C, time controling at 1-3 minute, limit calcination, composite solid cooling medium is stirred on limit, and removes the adhesive sintering block in time;
The component of composite solid cooling medium and mass percent be, Cr
2o
3: 45-47%, SiO
2: 1-2%, CaO:0.5-1%, FeO:20-30%, MgO:10-15%, AL
2o
3: 10-20%, its surplus is granularity 70-100 object carbon dust.
(4), be equipped with the liquid cooling medium of reusable edible, its main component is high temperature resistant inorganic oil A;
(5), by the cooling water pipe through rolling put into cast model on request, at the two ends of cooling water pipe by the external high-pressure hydraulic pump of resistant to elevated temperatures flexible pipe, the pressure of high-pressure hydraulic pump is 5-15Mpa; Before the cast of copper water, in cooling water pipe, pass into the liquid cooling medium of circulation in advance, in copper water casting process, composite solid cooling medium is joined in the liquid cooling medium of circulation, to ensure that cooling water pipe surface is micro-molten;
(6), with the copper water adding Antaciron block pour into a mould cooling plate base body, be cast in cooling plate base body by the middle part of cooling water pipe, two ends are stretched out in matrix, and temperature controls at 1120-1160 DEG C, make the copper water degree of superheat 40-80 DEG C of scope;
(7), in modeling process, allow and pour into a mould model accumbency, rising head lays particular stress on side moulding, by padded for model rising head side after model mould assembling, makes rigid flask become 10-15 degree with ground; In casting process, adopt upper and lower two-layer ingate to carry out ladder cast, two-layer ingate be spaced apart 10-50cm, the process of setting of controlled cooling model plate, impel its formed consecutive solidification;
(8), by the coldplate that above-mentioned cast is good be placed on after shady and cool lee cools 24 hours naturally, lay down model, in the Copper substrate completed, be cast into the part of steel cooling water pipe.
The gas refrigerating mode that the present invention breaks traditions, avoid use current must not then adopt to the disadvantageous internal densener block of material property, realize accurately controlling caloric receptivity, ensure that remelting and recrystallization do not occur cooling water pipe 2 outer surface, solve the problem of cooling water pipe 2 burn through and oxidation in casting process, impel cooling water pipe 2 surface micro-molten in casting process, and cooling water pipe 2 is combined closely with cooling plate base body 1 after being cast, maintain the grain form of cooling water pipe 2 under original rolling condition and structural behaviour, maintain the original good rolling performance of cooling water pipe 2.Further, according to different needs, the proportioning of composite solid cooling medium can be changed, change heat transfer efficiency, thus the surface of controlled cooling model water pipe 2 is micro-molten, ensures in conjunction with effect.
The production method of skimming tool provided by the invention, form based on copper-bimetal copper-steel fusion, adopt oxygen-free copper as cooling plate base body, adopt the steel pipe of rolling as cooling water pipe, matrix and cooling water pipe one-step casting shaping, comprising: in copper water, add slag forming agent and Antaciron block; Cooling water pipe is put into cast model, by liquid cold medium and composite solid cooling medium in cooling water pipe; By copper water cast cooling plate base body, the middle part of cooling water pipe is cast in matrix; Allow in casting process and pour into a mould model accumbency, rising head lays particular stress on side moulding, by padded for model rising head side after model mould assembling; Adopt upper and lower two-layer ingate to carry out ladder cast, form consecutive solidification; Cooling, lays down model.The present invention can effectively avoid cooling water pipe to be out of shape in casting process or local burn through; Avoid producing air gap between cooling plate base body and cooling water pipe; Avoid complete remelting and perfect recrystallization occur, accurately realize the micro-molten of cooling water pipe outer surface, improve the cooling effect of coldplate; By built-in rolled steel tube, enhance the mechanical performance of Copper substrate.Three-dimensional three-dimensional cooling effect can be formed to the resistance to material of skimming tool, reduce the temperature on the resistance to material surface of skimming tool, indirectly reduce the temperature of skimming tool Service Environment, reduce high temperature and chemical erosion to the destruction of the resistance to material of skimming tool, improve skimming tool service life.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the production method of a skimming tool, it is characterized in that, described skimming tool comprises cooling matrix and built-in cooling water pipe, cooling matrix is rectangular structure, the bottom surface of cooling matrix and two corresponding side surface uniform parallel are distributed with multiple prismatoid groove and form the fin of being convenient to dispel the heat, cooling water pipe along cooling intrinsic silicon repeatedly U-shaped bending arrange continuously, the water inlet of cooling water pipe and delivery port be all arranged on cooling matrix upper surface; Described cooling intrinsic silicon offers multiple through hole; Production method comprises the following steps:
(1), adopt intermediate frequency furnace copper smelting water, in copper smelting water latter stage, a point secondary adds slag forming agent, makes its uniform fold at copper water surface;
(2), before Tong Shui comes out of the stove, in induction furnace, disposable interpolation granularity is the Antaciron block of 30-40mm, and the mode adopting machinery to spray into is added;
(3), prepare composite solid cooling medium, after preparing, by composite solid cooling medium under atmospheric environment, carry out high temperature sintering, calcination temperature controls at 900-1300 DEG C, removes the adhesive sintering block into;
(4) liquid cooling medium of reusable edible, is equipped with;
(5), by the cooling water pipe through rolling put into cast model on request, at the two ends of cooling water pipe by the external high-pressure hydraulic pump of resistant to elevated temperatures flexible pipe, the pressure of high-pressure hydraulic pump is 5-15Mpa; Before the cast of copper water, in cooling water pipe, pass into the liquid cooling medium of circulation in advance, in copper water casting process, composite solid cooling medium is joined in the liquid cooling medium of circulation, to ensure that cooling water pipe surface is micro-molten;
(6), with the copper water adding Antaciron block pour into a mould cooling plate base body, be cast in cooling plate base body by the middle part of cooling water pipe, two ends are stretched out in matrix, control the copper water degree of superheat 40-80 DEG C of scope;
(7), in modeling process, allow and pour into a mould model accumbency, rising head lays particular stress on side moulding, by padded for model rising head side after model mould assembling, makes rigid flask become 10-15 degree with ground; In casting process, adopt upper and lower two-layer ingate to carry out ladder cast, two-layer ingate be spaced apart 10-50cm, the process of setting of controlled cooling model plate accordingly, impel its formed consecutive solidification;
(8), cool, lay down model, skimming tool is made.
2. the production method of skimming tool according to claim 1, is characterized in that: composition and the mass percent of described Antaciron block are: rare earth element 15-20%, silicon 20-30%, iron 50-65%; Antaciron block additional proportion is 1-10kg/ ton copper water.
3. the production method of skimming tool according to claim 1, is characterized in that: the component of described composite solid cooling medium and mass percent be, Cr
2o
3: 45-47%, SiO
2: 1-2%, CaO:0.5-1%, FeO:20-30%, MgO:10-15%, AL
2o
3: 10-20%, surplus is granularity 70-100 object carbon dust.
4. the production method of skimming tool according to claim 1, is characterized in that: described composite solid cooling medium, and its addition is: 1-10kg/ ton copper water.
5. the production method of skimming tool according to claim 1, is characterized in that: the raw material components of slag forming agent and mass percent are the SiO of the CaO of 30-50%, 10-30%
2, the AL of 4-10%, 15-25%Al
2o
3, the MgO of 10-15%.
6. the production method of skimming tool according to claim 1, is characterized in that: described liquid cooling medium, and its flow velocity is 1-10m/s.
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| CN110586923A (en) * | 2019-09-16 | 2019-12-20 | 四川省金镭重工有限公司 | Casting system and casting method of metallurgical blanking port |
| CN114264158A (en) * | 2021-12-31 | 2022-04-01 | 安徽凤阳玻璃股份有限公司 | Slag extractor |
| CN114800788B (en) * | 2022-03-22 | 2023-11-28 | 北京利尔高温材料股份有限公司 | Preparation method of skimming tool quick-change mold and iron runner |
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|---|---|---|---|---|
| JPS5722861A (en) * | 1980-07-15 | 1982-02-05 | Nippon Light Metal Co Ltd | Insert casting method of hollow member |
| JPS6380954A (en) * | 1986-09-24 | 1988-04-11 | Mitsubishi Heavy Ind Ltd | Casting method of rotor for kneading machine |
| CN2737800Y (en) * | 2004-10-01 | 2005-11-02 | 邯郸钢铁股份有限公司 | Slag skimmer |
| CN101509050A (en) * | 2009-03-23 | 2009-08-19 | 四川省川威集团有限公司 | Method for producing and mending slag separator |
-
2013
- 2013-12-05 CN CN201310644765.4A patent/CN103611921B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5722861A (en) * | 1980-07-15 | 1982-02-05 | Nippon Light Metal Co Ltd | Insert casting method of hollow member |
| JPS6380954A (en) * | 1986-09-24 | 1988-04-11 | Mitsubishi Heavy Ind Ltd | Casting method of rotor for kneading machine |
| CN2737800Y (en) * | 2004-10-01 | 2005-11-02 | 邯郸钢铁股份有限公司 | Slag skimmer |
| CN101509050A (en) * | 2009-03-23 | 2009-08-19 | 四川省川威集团有限公司 | Method for producing and mending slag separator |
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