CN1104261A - Spheroidization apparatus and spheriodization process thereof - Google Patents
Spheroidization apparatus and spheriodization process thereof Download PDFInfo
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- CN1104261A CN1104261A CN 93120914 CN93120914A CN1104261A CN 1104261 A CN1104261 A CN 1104261A CN 93120914 CN93120914 CN 93120914 CN 93120914 A CN93120914 A CN 93120914A CN 1104261 A CN1104261 A CN 1104261A
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Abstract
The present invention relates to a furnace-front spheroidizing equipment and process thereof for production of spheroidal graphite cast iron, which are ladle desulfurization and ladle inoculation processes. Said invention solves the problems of low magnesium absorbance and component segregation resulted from too quick reaction speed when using open ladle magnesium treatment for spheroidizing treatment. Said invention can improve working environment, and can saving the melting procedure of spheroidizing agent by using the equipment shown in drawing, and can fully utilize spheroidizing agent powder. In reaction chamber it can add a desulfurizing agent to make desulfurization treatment, and when adding the spheroidizing agent whose quantity is not enough for fully spheroidization, it can make inoculation treatment. It is used for casting various low-cost high-qualitymachine parts.
Description
Technical field that the present invention belongs to:
The present invention relates to that desulfurization in the device of the stokehold spheroidizing that a kind of spheroidal graphite cast iron produces and spheriodization process thereof thereof, the bag is handled and bag in the technology of inoculation.
The prior art background:
The nodulizing process of domestic and international application pours Bao Neifa, bell jar plunging, alloy stone roller plunging, rotates bag method, self-built pressure of magnesium adding method, magnesium silk covered wire method, covers casting ladle addition method, streamline method (In-Stream Method), inner type spheroidization method, porous plug method, porous matter filter method etc. at present.Above-mentioned nodulizing process in molten iron treatment capacity, operation, all there are relative merits separately Financial cost, equipment requirements and aspects such as steady quality and environmental influence, factory is adopting different nodulizing process according to separately practical situation.Domestic and international most factory all adopts " pouring Bao Neifa " to handle, because this method comparatively speaking, equipment is simple, and less investment is easy to operate.But, when pouring the Bao Neifa spheroidizing, molten iron and nodulizing agent contact area are big, reaction is violent, cause part particle nodulizing agent unreacted bigger than normal to finish promptly to float oxidization burning loss, and particle its surface-area of nodulizing agent less than normal is big, and the surging force of its whole anti-molten iron is little, very easily floats under the effect of magnesium vapor pressure to oxidize away when the surging force of molten iron and spheroidizing reacion.Along with the raising of the molten iron temperature of coming out of the stove, the vapor pressure of magnesium increases, molten iron boiling aggravation, and the scaling loss of nodulizing agent also increases thereupon.When bell jar plunging and self-built pressure of magnesium adding method spheroidizing, though can prevent the nodulizing agent come-up, because its speed of response is fast, the molten iron boiling is violent, and the consumption of nodulizing agent is still higher, its equipment complexity, troublesome poeration and poor stability, a large amount of magnesium vapors are not used.(the magnesium existence form after the spheroidizing in the molten iron has: one. compounds such as magnesium oxide, magnesium sulfide.Two. dissolved magnesium.Three. the magnesium bubble.The necessary magnesium bubble of spheroidization of graphite, in theory only need＜0.01% get final product).
When pouring the Bao Neifa spheroidizing, the nodulizing agent of use gives earlier by certain composition requirement and melting habitual.The scaling loss of magnesium, rare earth element is inevitable in the process of founding.Be broken into certain particle with founding qualified nodulizing agent, be generally 5-25MM.All be difficult to handle for the most of Alloy Plant of rare earth ferrosilicomagnesium nodulizing agent less than 5MM, each uses factory when spheroidizing it to be sifted out and throws aside, and does not also calculate in the add-on scope even if add.According to statistics, when the nodulizing agent that melting is qualified is broken for the 5-25MM size range, will produce the 15% nodulizing agent powder less than 5MM, these powder can not get reasonable use.
Above-mentioned reason has caused the cost that pours the Bao Neifa spheroidizing higher.
In addition, for the magnesium vapor pressure of controlling and producing when reducing spheroidizing, the scaling loss of minimizing magnesium when founding nodulizing agent, when founding nodulizing agent, add ferrosilicon, require silicon content 38-44%, magnesium is fused in the ferrosilicon, exists with the Mg2si form usually, the magnesium vapor pressure that produces when making spheroidizing reacion reduces about 60% in the time of 1400 ℃.Inoculation after the spheroidizing continue to increase the silicon content in the cast iron, and for specialized magnesium iron factory, siliceous higher in the foundry return just problem occurred, and also unfavorable to mechanical property for back and forth using continuously.Along with the increase of silicon content, casting cost also increases thereupon.
The purpose of invention:
It is simple to the purpose of this invention is to provide a kind of manufacturing process, and steady quality is reliable, the spheroidization apparatus of the low-cost spheroidal graphite cast iron that mechanical property and castability are good and spheriodization process thereof thereof.Another object of the present invention provides sulfur removal technology and effective inoculation technology in the easy bag that should go.
The content of invention:
Its technical solution is to make a transportable as shown in drawings spheroidizing reaction chamber, to sleeve pipe that is used for rotating 2 of existing common hot metal ladle 1 welding, being equipped with other device more just can make common flat hot metal ladle when the method that pours is handled molten iron, the cost of spheroidizing magnesium iron per ton can reduce 55-80%, and Working environment is improved, reduced the flue dust magnesium light.Adopt this device can cancel melter's program process, and keep original advantage nodulizing agent.Its technological process be directly that the melting nodulizing agent is required raw material (to handle the weight percent meter of molten iron) 0.33%-0.56%75 ferrosilicon,＜0.05% rare earth element (rare earth element adds in the rare earth alloy mode), 0.04-0.12% MAG block join in the reaction chamber 4 with carbon steel or iron casting successively, reaction chamber cap 6 closed reaction chamber's mouths with sheet iron system, promptly can be used to spheroidizing, saved the melting process of nodulizing agent, and eliminated nodulizing agent and founded melting loss of elements in the process.The reaction chamber that installs nodulizing agent 5 fixed with reaction chamber support 3 usefulness Luo bolts be connected, be inserted into sleeve pipe then, put on pin 7 and push reaction chamber to hot metal ladle contiguous bag mouth one side, tapping temperature according to molten iron covers an amount of iron end around reaction chamber, cover an amount of wood chip again, after the opposite side of bag mouth pours molten iron, reaction chamber is moved to the hot metal ladle center, spheroidizing reacion is everywhere evenly carried out.It is high in the reaction chamber that the reaction chamber internal diameter equals, the reaction chamber open area less than horizontal plane cross-section in the reaction chamber long-pending 50%, when the further controls reaction speed of need, the reaction chamber open area should less than horizontal plane cross-section in the reaction chamber long-pending 30%.When spheroidizing begins, molten iron pours at first will react chamber cap fusing in the hot metal ladle, and molten iron overflows into that the reaction chamber mouth touches MAG block.Proportion 1.738 gram per centimeters of magnesium
3, fusing point is 651 ℃, boiling point is 1107 ℃.Magnesium is all lower than the proportion and the fusing point of ferrosilicon, rare earth alloy, and the magnesium that is in reaction chamber lower floor at first melts and floats and soak ferrosilicon and rare earth alloy.The formed sosoloid of silicon, rare earth element and magnesium has fusing point and than the magnesium high boiling point low than magnesium, thereby the pressure of magnesium vapor come-up is reduced, and the boiling of magnesium vapor weakens.For silicon, rare earth element are dissolved each other with magnesium as early as possible, should reduce the particle size of ferrosilicon and rare earth alloy, be controlled at that 3MM is following to get final product.But, for preventing that ferrosilicon and rare earth alloy after the fragmentation from making moist, oxidation, with in plastics bag of its sealing of quantitatively packing into respectively with standby.Spacing at the bottom of changing the area of reaction chamber mouth and reconciling reaction chamber and hot metal ladle, can control spheroidizing reacion speed, after the area of reaction chamber mouth dwindles, the distance at the bottom of reaction chamber and the hot metal ladle reduces, spheroidizing reacion speed slows down, the float-amount of magnesium vapor is reduced, the white cigarette of magnesium oxide reduces significantly, and the utilization ratio of magnesium improves.The structure of reaction chamber support is for being welded to connect.
Adopt above-mentioned spheroidization apparatus and spheriodization process thereof thereof, will join in the reaction chamber with the 0.9-1.4% that handles weight of molten iron less than the nodulizing agent powder of 5MM, closed reaction chamber's mouth can carry out spheroidizing.This technology uses the nodulizing agent powder that factory is difficult to dispose.By evidence, that adopts that metallographic structure (under melting condition, molten iron composition, the nodulizing agent composition the same terms) nodulizing grade that obtains after this technology spheroidizing can be stable reaches 1 grade, and the graphite size is 7 grades, all corresponding raising of its mechanical property.
Utilizing spheroidization apparatus of the present invention can carry out desulfurization in bag handles or carries out desulfurization, nodularization Combined Processing.In reaction chamber, add to account for and handle the lime carbonate (Wingdale) of weight of molten iron 0.3-0.5% granularity less than 3MM, add again and account for the lime (being sealed in the plastics bag) of handling weight of molten iron 0.5-1.0%, enclosed reaction chamber's mouth can carry out desulfurization separately and handle in hot metal ladle.Its reaction process is when relying on lime carbonate to be heated to 825 ℃, the carbon dioxide that decomposition reaction produced ejects the undecomposed intact lime carbonate of the calcium oxide Buddhist monk in the reaction chamber, along with come-up gas, these molecules carry out desulphurization reaction in floating-upward process.This desulphurization reaction is to carry out equably from bottom to top in hot metal ladle, can obtain the ideal sweetening effectiveness.The step of desulfurization, nodularization Combined Processing is to add successively to account in reaction chamber to handle weight of molten iron 0.33-0.56%75 ferrosilicon (granularity is less than the 3MM plastic bag sealing), 0.04-0.07% MAG block, adding accounts for the lime (being sealed in the plastics bag) of processing weight of molten iron 1.0-1.6% as sweetening agent again, closed reaction chamber's mouth just can be used for wrapping interior desulfurization, nodularization Combined Processing.When Combined Processing, molten iron will react the chamber cap fusing and enter reaction chamber.Along with the rising of reaction room temp, magnesium and ferrosilicon melt in succession and come to life, under the effect of magnesium vapor pressure, calcium oxide is at first injected to come out to participate in desulphurization reaction, reduced the sulphur content in the molten iron, the effective rate of utilization of magnesium is improved, and the cost of spheroidizing is reduced.
Because the present invention controls spheroidizing reacion speed effectively and processing cost is reduced significantly, can be with the category of this technological expansion to inoculation.Promptly add the nodulizing agent that is not enough to complete nodularization quantity, controls reaction speed can obtain best pregnant effect, obtains tiny graphite, tensile strength is increased, and the chilling tendency of cast iron reduces, and obtains good machining property.Tensile strength reaches 250-450N/MM
2The time, hardness is HB160-210, thus the foundry goods that obtains high strength, soft, low cost and have good castability.
The advantage of invention:
The invention solves when pouring the Bao Neifa spheroidizing, the magnesium absorption rate that causes because of the spheroidizing reacion excessive velocities is low, the composition segregation, safety simple to operation, and steady quality is reliable.Pour method relatively with common, the cost of spheroidizing magnesium iron per ton can reduce 55-80%.Nodulizing grade can be stable reach 1 grade, the graphite size narrows down to 7 grades by the 5-6 level, all corresponding raising of mechanical property (tensile strength, unit elongation).Reduce the flue dust magnesium light, improved Working environment.Adaptability is strong, and is of many uses, and the molten iron uniform ingredients of spheroidizing, segregation-free, steady quality can wrap interior desulfurization and desulfurization, nodularization Combined Processing, and can expand to the category of inoculation.Cancelled melting process, and made the nodulizing agent powder obtain utilizing nodulizing agent.Succeeding in developing of " spheroidization apparatus and spheriodization process thereof thereof " opened up a new way for the ironcasting that obtains the low-cost and high-quality index, can be widely used in the manufacturing of all kinds of mechanical component.
Claims (7)
1, a kind of stokehold spheroidization apparatus and spheriodization process thereof thereof of producing spheroidal graphite cast iron, the total essential features of the present invention and prior art is to carry out spheroidizing by adding nodulizing agent, make that the graphite with unbound state is spherical or approximate spherical distribution in the cast iron, feature of the present invention is by the area that changes the reaction chamber mouth and the spacing at the bottom of reconciling reaction chamber and hot metal ladle is controlled spheroidizing reacion speed, spheroidizing reacion speed slows down, the float-amount of magnesium vapor is reduced, the white cigarette of magnesium oxide reduces significantly, the utilization ratio of magnesium improves, spheroidizing reacion is even, overcome the composition segregation, steady quality, and improved Working environment, it is high in the reaction chamber that the reaction chamber internal diameter equals, the reaction chamber open area less than horizontal plane cross-section in the reaction chamber long-pending 50%.
2, a kind of spheriodization process thereof of spheroidization apparatus according to claim 1, it is characterized in that the reaction chamber open area less than horizontal plane cross-section in the reaction chamber long-pending 30%.
3, a kind of spheriodization process thereof as spheroidization apparatus as described in the claim 1,2, nodulizing agent raw material required when it is characterized in that directly with spheroidizing adds 0.33-0.56% 75 ferrosilicon successively to handle weight of molten iron per-cent, add rare earth element in the rare earth alloy mode less than 0.05%, the 0.04-0.12% MAG block joins reaction chamber at last, closed reaction chamber's mouth, can carry out spheroidizing, cancel the melting process of magnesium-rare earth.
4, according to claim 1,2 described spheroidization apparatus and spheriodization process thereofs thereof, it is characterized in that in reaction chamber, adding 0.33-0.56% 75 ferrosilicon, 0.04-0.07% MAG block successively to handle weight of molten iron per-cent, to place the 1.0-1.6% lime in the sealed plastic bag to join reaction chamber at last, can in bag, carry out desulfurization, nodularization Combined Processing.
5, a kind of spheriodization process thereof as spheroidization apparatus as described in the claim 1,2, it is characterized in that and to join in the reaction chamber with the 0.9-1.4% that handles weight of molten iron less than the nodulizing agent powder of 5mm, closed reaction chamber's mouth can carry out spheroidizing, and the nodulizing agent powder obtains utilizing.
6, a kind of as claim 1,2 described spheroidization apparatus, it is characterized in that in reaction chamber, adding earlier accounting for and handle the lime carbonate of weight of molten iron 0.3-0.5% granularity less than 3mm, adding accounts for processing weight of molten iron 0.5-1.0% and is sealed in the interior lime of plastics bag again, can carry out desulfurization in bag and handle.
7, a kind ofly it is characterized in that adding the nodulizing agent that is not enough to complete nodularization quantity as claim 1,2 described spheroidization apparatus, controls reaction speed can obtain best pregnant effect, and tensile strength reaches 250-450N/mm
2The time, hardness is HB160-210, has advantages of good casting and machining property.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93120914 CN1104261A (en) | 1993-12-20 | 1993-12-20 | Spheroidization apparatus and spheriodization process thereof |
| CN94119828A CN1042656C (en) | 1993-12-20 | 1994-12-13 | Fumeless spheroidization treatment technology for spheroidal-graphite cast iron and spheroidization treatment device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93120914 CN1104261A (en) | 1993-12-20 | 1993-12-20 | Spheroidization apparatus and spheriodization process thereof |
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| CN1104261A true CN1104261A (en) | 1995-06-28 |
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| CN 93120914 Pending CN1104261A (en) | 1993-12-20 | 1993-12-20 | Spheroidization apparatus and spheriodization process thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057243C (en) * | 1998-02-18 | 2000-10-11 | 北京科技大学 | Metal liquid pulse inoculation treating method |
| CN1067442C (en) * | 1997-03-03 | 2001-06-20 | 刘年路 | Process and equipment for spheroidizing spheroidal graphite cast iron |
| CN100389909C (en) * | 2005-12-28 | 2008-05-28 | 山东建筑工程学院 | Spheroidized ladling apparatus |
| CN101029367B (en) * | 2007-04-17 | 2010-12-22 | 刘年路 | Spheroidizing treater |
| CN102021468A (en) * | 2010-10-25 | 2011-04-20 | 刘年路 | Smokeless spheroidizing method |
| CN102220540A (en) * | 2011-06-13 | 2011-10-19 | 江铃汽车股份有限公司 | Spheroidizing treatment technology by rush-in method |
| CN102399944A (en) * | 2011-12-29 | 2012-04-04 | 天津市万路科技有限公司 | Desulfurization treatment method for molten iron |
| CN101863464B (en) * | 2009-11-27 | 2012-09-05 | 洛阳市冠奇工贸有限责任公司 | Air-flow vortex balling machine for producing spherical graphite |
| CN109852757A (en) * | 2019-02-22 | 2019-06-07 | 青阳县光大铸造有限公司 | A method of spheroidal graphite cast-iron is produced using granular nodulizer |
| CN111304398A (en) * | 2019-12-13 | 2020-06-19 | 河北翼辰实业集团股份有限公司 | Cast iron spheroidizing system |
| CN113278763A (en) * | 2021-05-21 | 2021-08-20 | 马鞍山市兴达冶金新材料有限公司 | Product and method for magnesium or magnesium-calcium treatment of molten steel |
| CN115094300A (en) * | 2022-05-27 | 2022-09-23 | 刘锐 | Ferritic nodular cast iron and preparation method thereof |
-
1993
- 1993-12-20 CN CN 93120914 patent/CN1104261A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067442C (en) * | 1997-03-03 | 2001-06-20 | 刘年路 | Process and equipment for spheroidizing spheroidal graphite cast iron |
| CN1057243C (en) * | 1998-02-18 | 2000-10-11 | 北京科技大学 | Metal liquid pulse inoculation treating method |
| CN100389909C (en) * | 2005-12-28 | 2008-05-28 | 山东建筑工程学院 | Spheroidized ladling apparatus |
| CN101029367B (en) * | 2007-04-17 | 2010-12-22 | 刘年路 | Spheroidizing treater |
| CN101863464B (en) * | 2009-11-27 | 2012-09-05 | 洛阳市冠奇工贸有限责任公司 | Air-flow vortex balling machine for producing spherical graphite |
| CN103180474A (en) * | 2010-10-25 | 2013-06-26 | 天津市万路科技有限公司 | Smokeless spheroidization processing method |
| CN102021468B (en) * | 2010-10-25 | 2013-01-23 | 天津市万路科技有限公司 | Smokeless spheroidizing method |
| CN102021468A (en) * | 2010-10-25 | 2011-04-20 | 刘年路 | Smokeless spheroidizing method |
| CN103180474B (en) * | 2010-10-25 | 2015-08-19 | 天津市万路科技有限公司 | Smokeless spheroidizing method |
| CN102220540A (en) * | 2011-06-13 | 2011-10-19 | 江铃汽车股份有限公司 | Spheroidizing treatment technology by rush-in method |
| CN102399944A (en) * | 2011-12-29 | 2012-04-04 | 天津市万路科技有限公司 | Desulfurization treatment method for molten iron |
| CN109852757A (en) * | 2019-02-22 | 2019-06-07 | 青阳县光大铸造有限公司 | A method of spheroidal graphite cast-iron is produced using granular nodulizer |
| CN111304398A (en) * | 2019-12-13 | 2020-06-19 | 河北翼辰实业集团股份有限公司 | Cast iron spheroidizing system |
| CN113278763A (en) * | 2021-05-21 | 2021-08-20 | 马鞍山市兴达冶金新材料有限公司 | Product and method for magnesium or magnesium-calcium treatment of molten steel |
| CN115094300A (en) * | 2022-05-27 | 2022-09-23 | 刘锐 | Ferritic nodular cast iron and preparation method thereof |
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