CN114438274B - Production method of special high-silicon nodulizer for large castings - Google Patents
Production method of special high-silicon nodulizer for large castings Download PDFInfo
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- CN114438274B CN114438274B CN202210158655.6A CN202210158655A CN114438274B CN 114438274 B CN114438274 B CN 114438274B CN 202210158655 A CN202210158655 A CN 202210158655A CN 114438274 B CN114438274 B CN 114438274B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a production method of a special high-silicon nodulizer for large castings, which takes silica, coke, iron scale, rare earth silicon, calcium silicate and magnesium metal as raw materials, and the high-silicon nodulizer is obtained through smelting, weighing, heat exchanging, magnesium pressing and casting; the quality of Si in the ferrosilicon alloy liquid produced by smelting is more than or equal to 75 percent, and the temperature is 1700-1800 ℃. The advantages are that: the silicon content of more than 75% of the ferrosilicon alloy liquid is reserved, the tapping temperature of ferrosilicon is controlled to be more than 1700 ℃, and the tapping temperature is higher than the melting point temperature of rare earth silicon and calcium silicate, so that the conditions of a heat exchange process are met, and the phenomenon of reduced magnetic conductivity caused by no scrap steel is avoided; the temperature of the molten iron is melted by the self temperature of the molten iron, so that the temperature of the molten iron is ensured not to drop, and an intermediate frequency (power frequency) furnace with high energy consumption is replaced by a heat preservation furnace with low energy consumption; the gap between the outer wall of the counterweight pressing block and the inner wall of the furnace mouth of the heat preservation furnace is reduced, the sealing is ensured by auxiliary equipment, and the magnesium steam is sealed from the surface of molten iron to the furnace mouth, so that the leakage of the magnesium steam is prevented.
Description
Technical field:
the invention relates to the technical field of high-silicon nodulizer production, in particular to a production method of a special high-silicon nodulizer for large castings.
The background technology is as follows:
the nodular cast iron is widely used as a high-strength cast iron material, and the main raw materials of the nodular cast iron comprise pig iron, scrap steel, scrap iron and nodulizer ferrosilicon. The silicon content of the common spheroidal graphite cast iron is about 1.0%, which is mainly provided by special Q10 pig iron, however, when the wind power finished product is manufactured, the silicon content of the large spheroidal graphite cast iron is about 2.0%, so when the large spheroidal graphite cast iron is manufactured, the pig iron is added in the base iron to ensure the final composition of the casting.
However, after long-time production, the cost of silicon increase by virtue of pig iron is too high, and the carbon content of molten iron can be increased by increasing the addition amount of pig iron, so that a mode of increasing the silicon content of returned iron and adding a nodulizer into a furnace by adopting the molten iron is widely used, the returned iron is waste in the production process, the yield of large castings in the industry is very high, compared with the returned iron, the yield is very low, the supply is not required, and the silicon content of the nodulizer can be only increased to ensure that the requirement is met.
The spheroidizing agent commonly used in the industry at present is ferrosilicon rare earth magnesium alloy, the silicon content is generally about 40-45%, the spheroidizing agent belongs to medium and low silicon spheroidizing agents, the spheroidal graphite cast iron with the silicon content of about 1.0% is produced, the common production mode of ferrosilicon rare earth magnesium alloy is a secondary remelting method, a dual smelting pressure magnesium adding mode of an ore-smelting furnace and an intermediate frequency (power frequency) electric furnace is adopted, the specific process is that ferrosilicon alloy liquid is firstly produced by the ore-smelting furnace from raw materials such as silica and the like, the silicon content of molten iron accounts for more than 75%, then the ferrosilicon liquid is poured into the intermediate frequency (power frequency) furnace, and additive adjustment components such as rare earth silicon, ferrosilicon, calcium silicon, waste steel and the like are added, wherein the purpose of adding waste steel is to improve the magnetic conductivity in the furnace, increase the melting speed, the content of other components can be improved, the effect of reducing the silicon content is achieved, during the period, the temperature of the intermediate frequency (power frequency) furnace is required to be regulated, after the temperature of the intermediate frequency (power frequency) furnace is regulated, magnesium pressing treatment is carried out by special equipment, and finally, the spheroidizing agent is produced.
The method aims to meet the requirement of producing spheroidal graphite cast iron with the silicon content of about 2.0 percent, needs to improve the silicon content of the nodulizer to be more than 65 percent, improves the production process of the original medium-silicon nodulizer and the low-silicon nodulizer, and is used for producing the nodulizer with high silicon, and the technical problems to be solved are as follows:
1. the addition of scrap steel is reduced, more than 75% of silicon content of the original ferrosilicon alloy liquid is reserved, but the magnetic conductivity in an intermediate frequency (power frequency) furnace is reduced, and the melting speed is reduced;
2. after the melting speed is reduced, the medium frequency (power frequency) is heated for smelting, so that the energy consumption can be increased.
3. When the magnesium is pressed, the magnesium is pressed quickly to cause splashing, so that the normal pressure magnesium is relatively slow, and because the melting point of the magnesium is high, the slow speed can lead the magnesium to be easy to quickly generate magnesium-containing steam to be dispersed, thereby reducing the smelting of the effective magnesium, contacting with air for a long time, and leading the magnesium to react to generate high magnesium oxide, further reducing the smelting of the effective magnesium and influencing the magnesium content in the nodulizer.
The invention comprises the following steps:
the invention aims to provide a manufacturing method of a special high-silicon nodulizer for meeting the requirement of adding in the production process of large castings with the silicon content of 2.0 percent.
The invention is implemented by the following technical scheme:
a production method of a special high-silicon nodulizer for large castings comprises the steps of taking silica, coke, iron scale, rare earth silicon, silicon calcium and magnesium metal as raw materials, smelting, weighing, heat-exchanging, pressing magnesium and casting to obtain the high-silicon nodulizer;
the quality of Si in the ferrosilicon alloy liquid produced by smelting is more than or equal to 75 percent;
the mass of silicon in the high-silicon nodulizer is more than or equal to 68 percent.
Further, the method specifically comprises the following steps:
s1: raw material preparation: comprises silica, coke and iron scale;
s2: smelting: smelting silica, coke and iron scale into ferrosilicon molten iron by using an ore smelting furnace.
S3: weighing: molten iron is placed in a ladle, the ladle is lifted by a crane scale to weigh, the weight of the ferrosilicon liquid is obtained, and the mass required by the rare earth silicon, the silicon calcium and the metal magnesium is calculated according to the mass proportion of the molten iron, the rare earth silicon, the silicon calcium and the metal magnesium.
S4: and (3) heat blending: placing the rare earth silicon and the silicon calcium in advance in a holding furnace, pouring molten iron into the holding furnace, melting the rare earth silicon and the silicon calcium by utilizing the temperature of the molten iron, and waiting time is 1-3 minutes.
S5: pressing magnesium: the metal magnesium is a long magnesium ingot, the magnesium ingot is pressed into molten iron from the top furnace mouth of the heat preservation furnace through special magnesium pressing equipment, the magnesium ingot enters the heat preservation furnace, and the falling angle of the magnesium ingot is adjusted through auxiliary equipment at the top of the heat preservation furnace, so that the magnesium ingot smoothly passes through the heat preservation furnace mouth.
S6: casting: and (3) pouring molten iron directly into a casting pool through tilting of a holding furnace to cool the fixed die, so as to obtain the finished high-silicon nodulizer.
Further, the main components of the ferrosilicon alloy liquid in the step S2 comprise 78-90% of Si, 1.0-2.0% of Ca, 0.5-1.0% of Al and the balance of Fe.
Further, in step S5, the special equipment for pressing magnesium comprises a bracket, a square hydraulic cylinder, a winch, a fixed pulley and a counterweight pressing block, wherein the bottom of the cylinder body of the square hydraulic cylinder is horizontally fixed at the top of the bracket, the fixed pulley is respectively arranged at the top of the bracket and the telescopic rod of the square hydraulic cylinder, and the end part of a steel wire rope of the winch bypasses the fixed pulley and fixes the counterweight pressing block; the diameter of the counterweight pressing block is smaller than the inner diameter of the furnace mouth of the heat preservation furnace, and the gap between the outer wall of the counterweight pressing block and the inner wall of the furnace mouth of the heat preservation furnace is 10-30mm.
Further, in step S5, the auxiliary device includes an annular sleeve fixed on the top of the heat preservation furnace mouth, the inner diameter of the annular sleeve is the same as the inner diameter of the heat preservation furnace mouth, a sealing ring is fixed on the inner wall of the annular sleeve, support plates are uniformly distributed on the top of the annular sleeve along the circumference, the top ends of the support plates are obliquely upwards arranged from the heat preservation furnace mouth, and balls are embedded in the side walls, adjacent to the annular sleeve, of the support plates; the top of the holding furnace on one side of the support plate is fixedly provided with a vertical column, the top end of the vertical column is fixedly provided with a horizontal hydraulic cylinder with a horizontal stroke, a sliding rod horizontally penetrates through the vertical column, one end of the sliding rod is fixedly connected with the end part of a piston rod of the horizontal hydraulic cylinder, and the other end of the sliding rod is fixedly provided with a pressing hydraulic cylinder with a longitudinal stroke.
The invention has the advantages that: 1. the silicon content of more than 75% of the ferrosilicon alloy liquid is reserved, so that the addition of scrap steel is reduced, the tapping temperature of ferrosilicon is controlled to be about 1750 ℃ at the moment, and is higher than the melting point temperature of rare earth silicon and calcium silicate, the condition of a heat exchange process is met, and the phenomenon of reduced magnetic conductivity caused by the fact that scrap steel is not added is avoided;
2. when the heat exchange process is carried out, the raw materials in the heat preservation furnace are melted at high temperature by virtue of molten iron, so that the melting temperature is ensured not to be reduced, and the high energy consumption temperature rise of the intermediate frequency (power frequency) furnace is not needed, so that the intermediate frequency (power frequency) furnace with high energy consumption is replaced by the heat preservation furnace with low energy consumption, and the problem of high energy consumption of the intermediate frequency (power frequency) furnace is solved;
3. the gap between the outer wall of the counterweight pressing block and the inner wall of the furnace mouth of the heat preservation furnace is reduced, collision between the outer wall of the counterweight pressing block and the inner wall of the furnace mouth of the heat preservation furnace is avoided by aid of auxiliary equipment, alignment efficiency is improved, the gap is ensured to be uniform, steam generated after molten iron is pressed under metal magnesium, is sealed to the position from the surface of the molten iron to the furnace mouth, leakage of magnesium steam is prevented, and the amount of magnesium oxide is reduced.
Description of the drawings:
in order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a medium pressure magnesium-specific apparatus of the present invention;
FIG. 2 is an enlarged schematic view of a portion of the auxiliary device of FIG. 1 at point A;
fig. 3 is a schematic view of the use process of the medium-pressure magnesium-dedicated equipment and auxiliary equipment of the present invention.
In the figure: the device comprises a magnesium pressing special device 1, a bracket 2, a square hydraulic cylinder 3, a winch 4, a fixed pulley 5, a counterweight pressing block 6, auxiliary equipment 7, an annular sleeve 8, a support plate 9, balls 10, a sealing ring 11, a stand column 12, a horizontal hydraulic cylinder 13, a sliding rod 14 and a pressing hydraulic cylinder 15.
The specific embodiment is as follows:
the following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
a production method of a special high-silicon nodulizer for large castings comprises the steps of taking silica, coke, iron scale, rare earth silicon, silicon calcium and magnesium metal as raw materials, smelting, weighing, heat-exchanging, pressing magnesium and casting to obtain the high-silicon nodulizer; and (3) smelting to obtain ferrosilicon alloy liquid, wherein the mass of Si is more than or equal to 75%.
The method specifically comprises the following steps:
s1: raw material preparation: comprises silica, coke and iron scale, and the proportion is 1:1.0:0.11, the actual production is exemplified by: about 1780Kg of silica, about 1140Kg of coke and about 200Kg of iron scale;
s2: smelting: the silica, coke and iron scale are smelted into ferrosilicon alloy liquid (commonly called molten iron) by an ore smelting furnace, the main components of the ferrosilicon alloy liquid comprise 78-90% of Si by mass, 1.0-2.0% of Ca by mass, 0.5-1.0% of Al by mass and the balance of Fe by mass, the temperature of the molten iron is about 1700-1800 ℃, and the temperature of the molten iron is preferably controlled to be about 1750.
S3: weighing: placing molten iron by using a ladle, lifting the ladle by using a crown block and a crane scale to weigh to obtain the weight of ferrosilicon alloy liquid, wherein the ferrosilicon alloy liquid is about 2500Kg, the mass ratio of the molten iron to the rare earth silicon to the calcium and the magnesium is 1:0.06:0.05:0.075, the mass required by the rare earth silicon, the calcium silicate and the magnesium metal is calculated according to the mass ratio, and the mass required by the rare earth silicon, the calcium silicate and the magnesium metal is about 165Kg of rare earth silicon, about 112Kg of calcium silicate and about 187Kg of magnesium metal.
S4: and (3) heat blending: presetting the rare earth silicon and the calcium silicate with calculated weight in a heat preservation furnace in advance, wherein the melting point of the rare earth silicon is 1473-1573 ℃, the melting point of the calcium silicate is 980-1200 ℃, pouring molten iron into the heat preservation furnace, melting the rare earth silicon and the calcium silicate by utilizing the temperature of the molten iron, and waiting for 1-3 minutes;
the silicon content of more than 75% of the ferrosilicon alloy liquid is reserved, so that the addition of scrap steel is reduced, the tapping temperature of ferrosilicon is controlled to be about 1750 ℃ at the moment, and is higher than the melting point temperature of rare earth silicon and calcium silicate, the condition of a heat exchange process is met, and the phenomenon of reduced magnetic conductivity caused by the fact that scrap steel is not added is avoided; and secondly, when the heat exchange process is carried out, the temperature of the molten iron is melted by the self temperature, so that the temperature of the molten iron is ensured not to drop, and the high energy consumption temperature rise of an intermediate frequency (power frequency) furnace is not needed, so that the intermediate frequency (power frequency) furnace with high energy consumption is replaced by a low energy consumption heat preservation furnace, and the problem of high energy consumption of the intermediate frequency (power frequency) furnace is solved.
S5: pressing magnesium: the metal magnesium is a long magnesium ingot, the magnesium ingot is pressed into molten iron from the top furnace mouth of the heat preservation furnace through the special magnesium pressing equipment 1, the magnesium ingot enters the heat preservation furnace and enters the front of the heat preservation furnace, and the falling angle of the magnesium ingot is regulated through the auxiliary equipment 7 at the top of the heat preservation furnace, so that the magnesium ingot smoothly passes through the furnace mouth of the heat preservation furnace.
As shown in fig. 1, 2 and 3, the special magnesium pressing equipment 1 comprises a bracket 2, a square hydraulic cylinder 3, a winch 4, a fixed pulley 5 and a counterweight pressing block 6, wherein the bottom of a cylinder body of the square hydraulic cylinder 3 is horizontally fixed at the top of the bracket 2, the fixed pulley 5 is respectively arranged at the telescopic rod of the square hydraulic cylinder 3 and the top of the bracket 2, and the end part of a steel wire rope of the winch 4 bypasses the fixed pulley 5 and fixes the counterweight pressing block 6;
when the magnesium pressing process is carried out, firstly, the bracket 2 is moved to one side of the furnace mouth of the heat preservation furnace, then, a magnesium ingot is fixed at the bottom of the counterweight pressing block 6, the position of the magnesium ingot above the furnace mouth of the heat preservation furnace is adjusted by stretching and retracting the telescopic rod of the square hydraulic oil cylinder 3, the winch 4 lowers a steel wire rope, and the counterweight pressing block 6 drives the magnesium ingot to drop to the furnace mouth of the heat preservation furnace; the diameter of the counterweight pressing block 6 is smaller than the inner diameter of the furnace mouth of the heat preservation furnace, the gap between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace mouth of the heat preservation furnace is 10-30mm, the gap between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace mouth of the heat preservation furnace is small, collision between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace mouth of the heat preservation furnace needs to be avoided by virtue of auxiliary equipment 7, the alignment efficiency is improved, the gap is also ensured to be uniform, more magnesium vapor is prevented from leaking easily, the auxiliary equipment 7 comprises an annular sleeve 8 which is fixed at the top of the furnace mouth of the heat preservation furnace, the inner diameter of the annular sleeve 8 is the same as the inner diameter of the furnace mouth of the heat preservation furnace, a sealing ring 11 is fixed on the inner wall of the annular sleeve 8, support plates 9 are uniformly distributed at the top of the annular sleeve 8 along the circumference, the top ends of the support plates 9 are obliquely upwards arranged from the furnace mouth of the heat preservation furnace, and balls 10 are embedded on the side walls, close to the annular sleeve 8, of the support plates 9; the top of the holding furnace on one side of the support plate 2 is fixed with a vertical column 12, the top end of the vertical column 12 is fixed with a horizontal hydraulic cylinder 13 with a horizontal stroke, a sliding rod 14 horizontally penetrates through the vertical column 12, one end of the sliding rod 14 is fixed with the end part of a piston rod of the horizontal hydraulic cylinder 13, and the other end of the sliding rod 14 is fixed with a pressing hydraulic cylinder 15 with a longitudinal stroke.
The top of a plurality of support plates 9 obliquely upwards forms an open shape, the counterweight pressing block 6 is guided by the top of the support plates 9 and easily enters the annular sleeve 8 and the furnace mouth of the heat preservation furnace, the fault tolerance is increased, the counterweight pressing block 6 slides down along the rolling balls 10 to enter the heat preservation furnace, the balls 10 ensure that the gap between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace mouth of the heat preservation furnace is uniform, steam generated after molten iron is pressed downwards by the magnesium metal, is applied to the sealing ring 11 as much as possible, the horizontal hydraulic cylinder 13 drives the hydraulic cylinder 15 to horizontally slide above the counterweight pressing block 6 through the sliding rod 14, the hydraulic cylinder 15 presses the counterweight pressing block 6 downwards, so that the counterweight pressing block 6 is in friction seal with the sealing ring 11, the magnesium metal is pressed into alloy liquid which is melted with rare earth silicon and silicon calcium by the gravity of the counterweight pressing block 6, the sealing ring 11 can prevent magnesium steam from leaking out, the magnesium steam gradually reacts downwards along with the continuous movement of the counterweight pressing block 6, the magnesium steam space gradually decreases, and most of the magnesium steam is melted back into the molten iron, and silicon in the molten iron forms silicon-magnesium phase.
S6: casting: and (3) pouring molten iron into a casting pool directly through tilting of a holding furnace to cool the fixed die, so as to obtain a finished product high-silicon nodulizer, wherein the mass of silicon in the high-silicon nodulizer is more than or equal to 68%.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. A production method of a special high-silicon nodulizer for large castings is characterized in that silica, coke, iron scale, rare earth silicon, calcium silicate and magnesium metal are used as raw materials, and the high-silicon nodulizer is obtained through smelting, weighing, heat exchanging, magnesium pressing and casting;
the quality of Si in the ferrosilicon alloy liquid produced by smelting is more than or equal to 75 percent;
the mass of silicon in the high-silicon nodulizer is more than or equal to 68%;
the method specifically comprises the following steps:
s1: raw material preparation: comprises silica, coke and iron scale;
s2: smelting: smelting silica, coke and iron scale into ferrosilicon molten iron by using an ore smelting furnace;
s3: weighing: molten iron is placed in a ladle, the ladle is lifted by a crane scale to weigh, the weight of the ferrosilicon liquid is obtained, and the mass required by the rare earth silicon, the silicon calcium and the metal magnesium is calculated according to the mass proportion of the molten iron, the rare earth silicon, the silicon calcium and the metal magnesium.
S4: and (3) heat blending: placing the rare earth silicon and the silicon calcium in advance in a holding furnace, pouring molten iron into the holding furnace, melting the rare earth silicon and the silicon calcium by utilizing the temperature of the molten iron, and waiting time is 1-3 minutes.
S5: pressing magnesium: the metal magnesium is a long magnesium ingot, the magnesium ingot is pressed into molten iron from the top furnace mouth of the heat preservation furnace through special magnesium pressing equipment, the magnesium ingot enters the heat preservation furnace, and the falling angle of the magnesium ingot is adjusted through auxiliary equipment at the top of the heat preservation furnace, so that the magnesium ingot smoothly passes through the heat preservation furnace mouth.
S6: casting: and (3) pouring molten iron directly into a casting pool through tilting of a holding furnace to cool the fixed die, so as to obtain the finished high-silicon nodulizer.
2. The method for producing the special high-silicon nodulizer for large castings, according to claim 1, is characterized in that: the main component of the ferrosilicon alloy liquid in the step S2 comprises 78-90% of Si, 1.0-2.0% of Ca, 0.5-1.0% of Al and the balance of Fe.
3. The method for producing the special high-silicon nodulizer for large castings, according to claim 1, is characterized in that: the special equipment for pressing magnesium in the step S5 comprises a bracket, a square hydraulic cylinder, a winch, a fixed pulley and a counterweight pressing block, wherein the bottom of a cylinder body of the square hydraulic cylinder is horizontally fixed at the top of the bracket, the fixed pulley is respectively arranged at the telescopic rod of the square hydraulic cylinder and the top of the bracket, and the end part of a steel wire rope of the winch bypasses the fixed pulley and fixes the counterweight pressing block; the diameter of the counterweight pressing block is smaller than the inner diameter of the furnace mouth of the heat preservation furnace, and the gap between the outer wall of the counterweight pressing block and the inner wall of the furnace mouth of the heat preservation furnace is 10-30mm;
in the step S5, the auxiliary equipment comprises an annular sleeve fixed at the top of the heat preservation furnace mouth, the inner diameter of the annular sleeve is the same as that of the heat preservation furnace mouth, a sealing ring is fixed on the inner wall of the annular sleeve, support plates are uniformly distributed at the top of the annular sleeve along the circumference, the top ends of the support plates are obliquely upwards arranged from the heat preservation furnace mouth, and balls are embedded in the side walls, close to the annular sleeve, of the support plates; the top of the holding furnace on one side of the support plate is fixedly provided with a vertical column, the top end of the vertical column is fixedly provided with a horizontal hydraulic cylinder with a horizontal stroke, a sliding rod horizontally penetrates through the vertical column, one end of the sliding rod is fixedly connected with the end part of a piston rod of the horizontal hydraulic cylinder, and the other end of the sliding rod is fixedly provided with a pressing hydraulic cylinder with a longitudinal stroke.
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| CN115094182A (en) * | 2022-06-07 | 2022-09-23 | 聊城新泺机械有限公司 | Smelting technology and application of nodular cast iron molten iron without shrinkage cavity and shrinkage porosity tendency |
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| GB803652A (en) * | 1953-12-30 | 1958-10-29 | Union Carbide Corp | Process for producing nodular cast iron |
| CN1059564A (en) * | 1990-09-04 | 1992-03-18 | 承德钢铁厂 | Hot-metal process for producing composite aluminium-containing deoxidant in ore furnace |
| CN1218058C (en) * | 2001-09-30 | 2005-09-07 | 包头文鑫实业有限公司 | Boiling-less pressurized magnesium adding device and process for multicomponent alloy liquid under high silicon phase |
| CN1255568C (en) * | 2002-06-29 | 2006-05-10 | 包头文鑫实业有限公司 | Process for making core agent and core yarn of high magnesium alloy core-spun yarn |
| CN1274862C (en) * | 2004-08-10 | 2006-09-13 | 郭成会 | Technology for united producing rare earth calcium magnesium silicon iron alloy by mining hot furnace middle frequency induced electric furnace hot liquid |
| CN1932061A (en) * | 2006-10-30 | 2007-03-21 | 刘年路 | Nodulizer producing process |
| CN103433471A (en) * | 2013-09-06 | 2013-12-11 | 天津市万路科技有限公司 | Spheroidizing method of nodular cast iron |
| CN212560334U (en) * | 2020-05-29 | 2021-02-19 | 内蒙古圣泉科利源新材料科技有限公司 | Nodulizer production equipment capable of effectively reducing magnesium oxidation rate |
| CN112044502A (en) * | 2020-07-31 | 2020-12-08 | 江苏盛鑫气动液压设备有限公司 | Clamping jaw of magnesium pressing system |
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