CN1354057A - Passive magnesium powder and its preparation method - Google Patents
Passive magnesium powder and its preparation method Download PDFInfo
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- CN1354057A CN1354057A CN 01133304 CN01133304A CN1354057A CN 1354057 A CN1354057 A CN 1354057A CN 01133304 CN01133304 CN 01133304 CN 01133304 A CN01133304 A CN 01133304A CN 1354057 A CN1354057 A CN 1354057A
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Abstract
The present ivnention relates to a granular passive magnesium powder for external desulfurization in ferrous metallurgy industry and its preparation method. Said invention can adopt blowing process to inject the magnesium powder into molten iron or molten steel, and the passive magnesium powder also can be made into the form of cored wire that can be fed into the molten iron or molten steel by adopting wire-feeding process to make external desulfurization of molten iron. Said invented passive magnesium powder is characterized by that the surface of metal magnesium powder is coated with a layer of hydrophobic layer, said hydrophobic layer is an organic material which is solid at room temp. and possesses hydrophobic property, then on the surface of said hydrophobic layer a layer of fire-resisting layer is adhered.
Description
Technical field the present invention relates to a kind of graininess deactivating magnesium powder that is used for Ferrous Metallurgy industry external desulfurzation and preparation method thereof, and deactivating magnesium powder can be used for the molten iron in the Ferrous Metallurgy industry, the external desulfurzation of molten steel.Deactivating magnesium powder with the present invention's preparation can adopt the method for winding-up that it is sprayed in molten iron or the molten steel, also can be made into core-spun yarn and adopts injection feeding technology to carry out external desulfurization of hot metal in its feeding molten iron or the molten steel.
Background technology is along with progress of science and technology, the user has higher requirement to the quality of steel, especially strict more to the requirement of the sulfur content in the steel, require low-sulfur steel (S＜0.010%) and ultralow-sulfur steel (S＜0.005%) serviceability with assurance steel with fields such as steel and aviation, automobile, the energy, chemical industry with steel with steel, the thick deck of boat with steel, offshore production platform as: petroleum natural gas pipeline.In addition, continuous casting process itself also requires the sulfur content of molten steel low, to avoid " hot tearing " of continuous casting billet, obtains favorable surface quality, improves billet yield.Studies show that S＜0.020% o'clock in the general molten steel can obtain the good continuous casting billet of surface quality; S in the molten steel＜0.008% o'clock can make the continuous casting billet yield improve 2%.Therefore reduce that sulfur content in the molten steel has become that smelter improves the quality of products and one of major measure of the market competitiveness.Traditional with CaO, CaC
2It is the requirement that main desulfurizing agent can not adapt to market and continuous casting process itself.For reducing the sulfur content in the steel, sixties end is developed the external desulfurization of hot metal technology.Adopt this technology, remove and to improve steel product quality, also can improve the production capacity of steelmaking equipment greatly.In recent years, efficient Mg-base desulfurizing agent comes into one's own day by day, and is applied.Take the lead in adopting Mg-base desulfurizing agent to carry out the external desulfurization of hot metal commerical test at China's Anshan iron and steel plant, smelt the ultralow-sulfur steel of S＜0.005% in 98 years.Baosteel, this steel have been introduced the external desulfurization of hot metal technology and equipment from the U.S., Canada respectively, use Mg-base desulfurizing agent to carry out external desulfurization of hot metal.Afterwards, Anshan iron and steel plant, wine steel, climb domestic other steel mills such as steel also in the technological transformation of carrying out this respect.Mg-base desulfurizing agent more and more is subjected to the attention of domestic iron and steel enterprises.Mg-base desulfurizing agent mainly is made up of magnesium metal particle and lime, the additive that the interpolation that has is an amount of, as: CaF
2Deng, used magnesium metal grain diameter mostly is 0.1～2.0mm greatly, because the specific area of metal magnesium powder is very big, and its ignition energy is very little, autoignition temperature is low, the blast limit of the hydrogen that is produced with the reaction of airborne steam is very low and scope is very big, thus easier in air combustion explosion, this has brought great insecurity for accumulating and use.The passivation of magnesium metal and alloy mainly adopts Chong Chrome acid salt solution to soak, and makes its surface generate one deck passivating film in case oxidation in air, though this method is widely used in aircraft industry contains the processing of magnesium alloy workpiece, is unsuitable for the passivation of metal magnesium powder; On the one hand because the specific area of magnesium powder is very big, the expending in a large number of Zao Cheng Chong Chrome hydrochlorate handled inevitable metal magnesium powder on the other hand in the aqueous solution and the water effect is separated out hydrogen and consumed magnesium metal.What U.S. Pat Patent 3881913 described is a kind of deactivating magnesium powder that adopts atomization production surface to be surrounded by salt deposit, its method is: 670～720 ℃ liquid metal magnesiums are introduced in the fused salt of 670～730 ℃ chloride and fluoride, the bottom of pouring rotation at a high speed then into has in the cup-shaped receptacle of many apertures.When magnesium metal liquid and molten salt mixture flow out from aperture, adopt high wind with its fragmentation, so just obtain the deactivating magnesium powder that the surface is surrounded by salt deposit.Chinese patent publication number 2378399 also is that the similar method of a kind of employing is produced deactivating magnesium powder.And the method for U.S. Pat Patent 4279641 is that liquid metal magnesium is introduced in the fused salt of 670～820 ℃ chloride and fluoride, carry out high-speed stirred, make liquid metal magnesium be dispersed in the fused salt, liquid metal magnesium accounts for 40% in the mixture, pour into then on the chill roll that has water cooling plant and cool off, with disintegrating apparatus that it is broken apart again, obtain the deactivating magnesium powder that the surface is surrounded by salt deposit.The common feature of these methods is to be surrounded by salt deposit on the surface of metal magnesium powder particle.Because the main component of salt deposit is the chloride that very easily absorbs water in air vapour, so still can not avoid the effect of magnesium metal and water.This shortcoming is the unsurmountable fatal shortcoming of this method.At present, mechanical processing method is mainly adopted in the production of China's metal magnesium powder, at first makes the magnesium ring, is machined into magnesium chips, is broken into the magnesium powder then, and the magnesium powder needs could satisfy through Passivation Treatment the requirement of accumulating, use.The production method of the passivated magnesium particle of Chinese patent publication number 2378399 reports is to coat the anti-oxidant flame-retardant layer of skim on the magnesium metal particle surface, outermost layer connects the epidermis material, form the composite bed passivated magnesium particle of definite shape, the molten iron that this passivated magnesium particle can be used in the Ferrous Metallurgy industry gives processing.
Deactivating magnesium powder that summary of the invention the present invention adopts and preparation method thereof is the surface applied one deck hydrophobic layer at metal magnesium powder, this hydrophobic layer is at room temperature to be solid-state and to have hydrophobic organic matter, and then on the hydrophobic layer surface, adhere to one deck flame-retardant layer, this flame-retardant layer has excellent flame-retardant performance, the deactivating magnesium powder that makes like this can overcome the shortcoming of above-mentioned technology, and the molten iron that satisfies in the Ferrous Metallurgy industry gives the requirement of processing to deactivating magnesium powder accumulating, use.
Deactivating magnesium powder of the present invention and preparation method thereof content Description:
Deactivating magnesium powder of the present invention and preparation method thereof is characterized in that: be to be surface applied one deck hydrophobic layer of the granular metal magnesium powder of 0.1～2.0mm in granularity, adhere to one deck flame-retardant layer again on the hydrophobic layer surface; Water-repelling agent is to be solid-state organic matter under the room temperature, and refer to: rosin, pitch and resin and composition thereof, the consumption of water-repelling agent are to account for 1～10% of deactivating magnesium powder gross weight; Fire retardant is one or more mixture of oxide, the salt of Ca, Mg, Al, Si, that is: CaO, MgO, CaCO
3, MgCO
3, Al
2O
3, SiO
2And composition thereof; Fire retardant is that particle diameter is the following powder of 0.08mm, preferably the following powder of 0.03mm; The consumption of fire retardant accounts for 1～20% of deactivating magnesium powder gross weight; The water-repelling agent that is added and the gross weight of fire retardant are 3～25% of deactivating magnesium powder gross weight;
The preparation method of deactivating magnesium powder (1):
Earlier water-repelling agent is heated, temperature is controlled at 60～150 ℃ is in a liquid state it, again granular metal magnesium powder is fully mixed with it, make coating one deck hydrophobic layer on the granular metal magnesium powder surface, and then pulverous fire retardant fully mixed with it, its surface is gone up adhere to one deck flame-retardant layer, promptly make deactivating magnesium powder after the cooling;
The preparation method of deactivating magnesium powder (2):
Earlier granular metal magnesium powder is heated, temperature is controlled at 60～150 ℃, water-repelling agent being added fully mixes it again, make coating one deck hydrophobic layer on the granular metal magnesium powder surface, and then pulverous fire retardant added fully mix with it, its surface is gone up adhere to one deck flame-retardant layer, promptly make deactivating magnesium powder after the cooling;
The preparation method of deactivating magnesium powder (3):
Preparation granular metal magnesium powder can also adopt: granular metal magnesium powder and water-repelling agent are added simultaneously, through heating and temperature control at 60～150 ℃, and it is fully mixed, coating one deck hydrophobic layer on granular metal magnesium powder surface, and then the adding fire retardant fully mixes with it, its surface is gone up adhere to one deck flame-retardant layer, promptly make deactivating magnesium powder after the cooling.
The deactivating magnesium powder that the present invention makes has good dispersiveness, seldom lump, even caking also is easy to fragmentation, have excellent hydrophobic property and anti-flammability, can metal magnesium powder and air is isolated fully, therefore can not absorb airborne steam, thereby overcome the unsurmountable fatal shortcoming that conventional art exists, avoid the unhelpful consumption of metal magnesium powder simultaneously yet.The deactivating magnesium powder that the present invention makes also has good flowability (angle of repose α＜35 °), can satisfy molten iron in the Ferrous Metallurgy industry fully and give and handle the technological requirement of blowing process to the flowability of deactivating magnesium powder.The molten iron that the deactivating magnesium powder that adopts the present invention to make can satisfy in the Ferrous Metallurgy industry fully gives the requirement of processing to deactivating magnesium powder accumulating, use.Preparation method of the present invention has that raw material sources are extensive, preparation technology is simple, production efficiency is high, small investment, characteristics that cost is low.Its product can be used to make Mg-base desulfurizing agent and adopt blowing method to carry out external desulfurization of hot metal, also can be made into core-spun yarn and adopt injection feeding technology to carry out external desulfurization of hot metal in its feeding molten iron or the molten steel.
The specific embodiment
Embodiment 1
25g rosin is put into beaker, electric furnace is heated to 120 ℃, is that the metal magnesium powder of 0.2～1.0mm is put into beaker again with the 500g granularity, and stirring and putting into the 25g granularity after 3 minutes is 200 purpose active limes, stir again after 2 minutes and take off cooling, promptly obtain the deactivating magnesium powder of the present invention's preparation after pulverizing.Magnesium metal content is 90.9% in this deactivating magnesium powder, and bulk density is 0.85g/cm
3, angle of repose α=32 °.
Embodiment 2
25g epoxy resin is put into beaker, electric furnace is heated to 140 ℃, the metal magnesium powder that with the 500g granularity is 0.2～1.0mm is again put into beaker, stirring and putting into the 25g granularity after 3 minutes is 200 purpose active limes, stir again after 2 minutes and take off cooling, promptly obtain the deactivating magnesium powder of the present invention's preparation after pulverizing.Magnesium metal content is 90.9% in this deactivating magnesium powder, and bulk density is 0.88g/cm
3, angle of repose α=34 °.
Embodiment 3
With the 20kg granularity is that the metal magnesium powder of 0.2～0.8mm is put into iron pan, coal gas is heated to 120 ℃, again 1kg rosin is put into iron pan, and stirring and putting into the 1kg granularity after 3 minutes is the moistureproof lime of 200 purposes, stir and take off cooling after 2 minutes, promptly obtain the deactivating magnesium powder of the present invention's preparation after pulverizing.Magnesium metal content is 90.9% in this deactivating magnesium powder, and bulk density is 0.85g/cm
3, angle of repose α=34 °.5 tons of deactivating magnesium powders production deactivating magnesium powder content producing with this method are 20%, moistureproof lime content is 70%, graphite powder is 5%, the fluorite powder is 5% Mg-base desulfurizing agent, is that 0.030～0.050% molten iron gives processing with this Mg-base desulfurizing agent to sulfur content, use 100 tons ladle to load 90～100 tons of molten iron, desulfurization time is 4～6 minutes, the hot metal temperature drop of sweetening process is 15～19 ℃, iron loss＜6kg/t iron that slag band iron is caused, the consumption of Mg-base desulfurizing agent is 4～6kg/t iron, and desulfuration efficiency is 90%, and can realize dark desulfurization.The sulfur content of handling the back molten iron is 0.003～0.008%, and great majority are below 0.005%, the desulfurization hit rate＞and more than 90%.According to as can be known to the commerical test comparing result of winding-up CaO base, two kinds of desulfurizing agents of magnesium base, during winding-up CaO base desulfurizer, desulfurization time is 15～20 minutes, the hot metal temperature drop of sweetening process is 30～45 ℃, the iron loss that slag band iron is caused is 9～12kg/t iron, the consumption of Mg-base desulfurizing agent is 10～12kg/t iron, and desulfuration efficiency is about 80%, and is difficult to realize dark desulfurization.The sulfur content of handling the back molten iron is more than 0.010%, and great majority are about 0.015%, and the desulfurization hit rate can not guarantee.As seen, the deactivating magnesium powder of winding-up the present invention preparation is that the made Mg-base desulfurizing agent of main component carries out external desulfurization of hot metal and carries out external desulfurization of hot metal with winding-up CaO base desulfurizer and compare, the deactivating magnesium powder of winding-up the present invention preparation be the made Mg-base desulfurizing agent of main component carry out external desulfurization of hot metal have the iron loss that the blowing powder amount is few, rate of sulphur expulsion is fast, desulfuration efficiency is high, desulfurization shoots straight, the quantity of slag is few, hot metal temperature drop is low, slag band iron is caused little, take plurality of advantages such as the production time is few, this has a lot of benefits to the iron and steel enterprise that adopts continuous casting technology.Desulfurizing agent expense, iron loss and three cost calculations of lowering the temperature are shown three cost summations of winding-up CaO base desulfurizer are 30.2 yuan/t iron, and three costs of winding-up Mg-base desulfurizing agent are 25.9 yuan/t iron.As seen the cost that uses deactivating magnesium powder that the present invention prepares to carry out external desulfurization of hot metal as the made Mg-base desulfurizing agent of main component is lower than the cost of winding-up CaO base desulfurizer.
Embodiment 4
With the 20kg granularity is that the metal magnesium powder of 0.2～1.0mm is put into high speed agitator and stirred 1～2 minute, the heat that friction is produced can rise to the temperature of metal magnesium powder 120 ℃, again 1kg rosin is put into high speed agitator, continuation is stirred and put into the 1kg granularity after 2 minutes is the moistureproof lime of 200 purposes, stir and take out cooling after 2 minutes, promptly obtain the deactivating magnesium powder of the present invention's preparation after pulverizing.Magnesium metal content is 92.6% in this deactivating magnesium powder, and bulk density is 0.82g/cm
3, angle of repose α=34 °.20 tons of deactivating magnesium powders production deactivating magnesium powder content producing with this method are 20%, moistureproof lime content is 70%, graphite powder is 5%, the fluorite powder is 5% Mg-base desulfurizing agent, is that 0.040～0.070% molten iron gives processing with this Mg-base desulfurizing agent to sulfur content, use 100 tons ladle to load 90～100 tons of molten iron, desulfurization time is 4～6 minutes, the hot metal temperature drop of sweetening process is 15～19 ℃, iron loss＜6kg/t iron that slag band iron is caused, the consumption of Mg-base desulfurizing agent is 4～6kg/t iron, and desulfuration efficiency is more than 90%, and can realize dark desulfurization.The sulfur content of handling the back molten iron is 0.003～0.008%, and great majority are below 0.005%, and the minimum sulfur content of the molten iron after the processing can reach 0.001%, desulfurization hit rate＞90%.According to as can be known to the commerical test comparing result of winding-up CaO base, two kinds of desulfurizing agents of magnesium base, during winding-up CaO base desulfurizer, desulfurization time is 15～20 minutes, the hot metal temperature drop of sweetening process is 30～45 ℃, the iron loss that slag band iron is caused is 9～12kg/t iron, the consumption of Mg-base desulfurizing agent is 10～12kg/t iron, and desulfuration efficiency is 80%, and is difficult to realize dark desulfurization.The sulfur content of handling the back molten iron is more than 0.010%, and great majority are about 0.015%, and the desulfurization hit rate can not guarantee.As seen, the deactivating magnesium powder of winding-up the present invention preparation is that the made Mg-base desulfurizing agent of main component carries out external desulfurization of hot metal and carries out external desulfurization of hot metal with winding-up CaO base desulfurizer and compare, the deactivating magnesium powder of winding-up the present invention preparation be the made Mg-base desulfurizing agent of main component carry out external desulfurization of hot metal have the iron loss that the blowing powder amount is few, rate of sulphur expulsion is fast, desulfuration efficiency is high, desulfurization shoots straight, the quantity of slag is few, hot metal temperature drop is low, slag band iron is caused little, take plurality of advantages such as the production time is few, this has a lot of benefits to the iron and steel enterprise that adopts continuous casting technology.Desulfurizing agent expense, iron loss and three cost calculations of lowering the temperature are shown, three cost summations of winding-up CaO base desulfurizer are 30.2 yuan/t iron, and three costs of winding-up Mg-base desulfurizing agent are 25.9 yuan/t iron, and the cost that as seen uses deactivating magnesium powder that the present invention prepares to carry out external desulfurization of hot metal as the made Mg-base desulfurizing agent of main component is lower than the cost of winding-up CaO base sulphur agent.
Claims (4)
1, a kind of graininess deactivating magnesium powder that is used for Ferrous Metallurgy industry external desulfurzation is characterized in that: be to be surface applied one deck hydrophobic layer of the granular metal magnesium powder of 0.1～2.0mm in granularity, adhere to one deck flame-retardant layer again on the hydrophobic layer surface; Water-repelling agent is to be under the room temperature to refer to solid-state organic matter: rosin, pitch and resin and composition thereof; The consumption of water-repelling agent is to account for 1～10% of deactivating magnesium powder gross weight; Fire retardant is one or more mixture of oxide, the salt of Ca, Mg, Al, Si, that is: CaO, Mg, CaCO
3, MgCO
3, Al
2O
3, SiO
2And composition thereof; Fire retardant is that particle diameter is the following powder of 0.08mm, preferably the following powder of 0.03mm; The consumption of fire retardant accounts for 1～20% of deactivating magnesium powder gross weight; The water-repelling agent that is added and the gross weight of fire retardant are 3～25% of deactivating magnesium powder gross weight.
2, the preparation method of deactivating magnesium powder according to claim 1 (1), it is characterized in that: earlier granular metal magnesium powder is heated, temperature is controlled at 60～150 ℃, water-repelling agent being added fully mixes it again, make coating one deck hydrophobic layer on the granular metal magnesium powder surface, and then pulverous fire retardant added fully mix with it, make its surface go up adhesion one deck flame-retardant layer, promptly make deactivating magnesium powder after the cooling.
3, the preparation method of deactivating magnesium powder according to claim 1 (2), it is characterized in that: earlier granular metal magnesium powder is heated, temperature is controlled at 60～150 ℃, water-repelling agent being added fully mixes it again, make coating one deck hydrophobic layer on the granular metal magnesium powder surface, and then pulverous fire retardant added fully mix with it, make its surface go up adhesion one deck flame-retardant layer, promptly make deactivating magnesium powder after the cooling.
4, the preparation method of deactivating magnesium powder according to claim 1 (3), it is characterized in that, preparation granular metal magnesium powder can also adopt: granular metal magnesium powder and water-repelling agent are added simultaneously, through heating and temperature control at 60～150 ℃, and it is fully mixed, coating one deck hydrophobic layer on granular metal magnesium powder surface, and then the adding fire retardant fully mixes with it, its surface is gone up adhere to one deck flame-retardant layer, promptly make deactivating magnesium powder after the cooling.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328393C (en) * | 2005-07-16 | 2007-07-25 | 包头文鑫实业有限公司 | Coated wire with flexible coating |
| CN102248172A (en) * | 2010-05-18 | 2011-11-23 | 辽宁丰华有色金属集团有限公司 | Method for producing coating particle magnesium |
| CN103525967A (en) * | 2013-11-01 | 2014-01-22 | 吉林建龙钢铁有限责任公司 | Hot metal pretreatment desulfurization technology with calcite and passivation particle magnesium injected in composite mode |
| CN105925758A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Lime-magnesium grain cored wire, application of lime-magnesium grain cored wire and production process for high heat input welding steel |
| CN105925757A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Fluorite-magnesium grain cored wire, application of fluorite-magnesium grain cored wire and production process for high heat input welding steel |
| CN105925761A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Glass-magnesium grain cored wire and production technology of steel for high heat input welding |
| CN105925759A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel |
| CN105925760A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Wollastonite-magnesium grain cored wire, application as well as production technology of steel for high heat input welding |
| CN106011375A (en) * | 2016-07-08 | 2016-10-12 | 华北理工大学 | Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding |
| CN106191373A (en) * | 2016-07-08 | 2016-12-07 | 华北理工大学 | Covering slag magnesium grain core-spun yarn and application and high input energy welding steel production technology |
| CN107287377A (en) * | 2016-04-01 | 2017-10-24 | 上海梅山钢铁股份有限公司 | A kind of molten iron spraying desulfurization spraying composite desulfurizing agent and preparation method thereof |
| CN111334632A (en) * | 2020-02-26 | 2020-06-26 | 内蒙古赛思普科技有限公司 | Molten iron for casting with directly produced low phosphorus and production method thereof |
| CN111485051A (en) * | 2020-06-12 | 2020-08-04 | 韩波 | Phosphorus pig iron high-efficiency desulfurizer for aluminum electrolysis |
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2001
- 2001-10-17 CN CN 01133304 patent/CN1354057A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328393C (en) * | 2005-07-16 | 2007-07-25 | 包头文鑫实业有限公司 | Coated wire with flexible coating |
| CN102248172A (en) * | 2010-05-18 | 2011-11-23 | 辽宁丰华有色金属集团有限公司 | Method for producing coating particle magnesium |
| CN103525967A (en) * | 2013-11-01 | 2014-01-22 | 吉林建龙钢铁有限责任公司 | Hot metal pretreatment desulfurization technology with calcite and passivation particle magnesium injected in composite mode |
| CN103525967B (en) * | 2013-11-01 | 2015-08-19 | 吉林建龙钢铁有限责任公司 | The molten iron pretreatment desulfurizing technique of composite blowing calcite and passivation particle magnesium |
| CN107287377A (en) * | 2016-04-01 | 2017-10-24 | 上海梅山钢铁股份有限公司 | A kind of molten iron spraying desulfurization spraying composite desulfurizing agent and preparation method thereof |
| CN105925761A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Glass-magnesium grain cored wire and production technology of steel for high heat input welding |
| CN105925757A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Fluorite-magnesium grain cored wire, application of fluorite-magnesium grain cored wire and production process for high heat input welding steel |
| CN105925759A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel |
| CN105925760A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Wollastonite-magnesium grain cored wire, application as well as production technology of steel for high heat input welding |
| CN106011375A (en) * | 2016-07-08 | 2016-10-12 | 华北理工大学 | Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding |
| CN106191373A (en) * | 2016-07-08 | 2016-12-07 | 华北理工大学 | Covering slag magnesium grain core-spun yarn and application and high input energy welding steel production technology |
| CN105925758A (en) * | 2016-07-08 | 2016-09-07 | 华北理工大学 | Lime-magnesium grain cored wire, application of lime-magnesium grain cored wire and production process for high heat input welding steel |
| CN111334632A (en) * | 2020-02-26 | 2020-06-26 | 内蒙古赛思普科技有限公司 | Molten iron for casting with directly produced low phosphorus and production method thereof |
| CN111485051A (en) * | 2020-06-12 | 2020-08-04 | 韩波 | Phosphorus pig iron high-efficiency desulfurizer for aluminum electrolysis |
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