CN104131136A - Material for desulfurizing molten iron and molten steel and preparation method thereof - Google Patents
Material for desulfurizing molten iron and molten steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a material for desulfurizing molten iron and molten steel and a preparation method thereof and belongs to the field of ferrous metallurgy. The material is filiform and comprises an inner core, a magnesium ribbon, filler particles and a steel strip orderly from inside to outside; the inner core is made of magnesium or calcium filaments, wherein the magnesium filaments are prepared from the following components in percentage by weight: 0.01-1.20% of Al, 0-2.10% of Si, 0-0.80 of Mn, 0.01-3.20% of Fe and the balance of Mg; the calcium filaments are prepared from the following components in percentage by weight: 0.40-1.80% of Al, 0-1.20% of Si, 0-0.60 of Mn, 0.03-2.50 of Fe and the balance of Ca; the magnesium ribbon is prepared from the following components in percentage by weight: 0.1-1.5% of Al, 0.1-1.5% of Si, 0.1-1.5 of Mn, 0.03-2.50 of Fe and the balance of Mg. The material is added to molten iron and molten steel, and is capable of improving the reactivity due to positive dependent interaction; as a result, the desulfurization efficiency can be greatly improved.
Description
Technical field
The invention belongs to ferrous metallurgy field, specifically, relate to a kind of molten iron, molten steel desulfurizing material and preparation method thereof.
Background technology
Ferrous metallurgy aspect, in order to make sulphur content in steel reach very low degree, reduce harmful over-all properties that is mingled with and improves steel in steel, the method that people often adopt is: the one, molten iron is optimized to processing, the one, molten steel is carried out to deep desulfuration, existing material therefor and method have its shortcoming to be: the design of (one) sweetening agent is difficult to accomplish accurately, cause desulphurization cost and desulfurization precision widely different.(2) existing desulfurizing iron is exactly powder injection process and paddling process, needs several ten million yuan to the huge installations and facilities input of several hundred million units.Running cost is high simultaneously.(3) the existing Desulphuring Process of Molten Iron cycle relatively long, efficiency is relatively low, sulfur removal technology control deficiency, adaptability is wideless.(4) to the sweetening agent that directly adds existing use in molten steel, be difficult to accomplish the dark desulfurization of molten steel, desulfurization precision is also uncontrollable, and the dark desulfurization of molten steel at present all adopts that ladle furnace is concise completes (its cycle is long, and cost is very high).
Have much about the mode of molten iron, molten steel desulfurizing, but effect is all desirable not to the utmost, for example China Patent No.: 201410140096.1, patent name is: sweetening agent and add method, this disclosure of the invention a kind of sweetening agent and add method, the alloy being made up of magnesium, the aluminium of 40wt%～45wt% and the iron of 35wt%～40wt% of 15wt%～20wt% according to the sweetening agent of this inventive embodiment is 500 DEG C～550 DEG C according to the fusing point of the sweetening agent of this invention.Be to join in molten steel in line feeding mode when the RH vacuum refinement according to the method that adds of the sweetening agent of this invention, will be processed into the metal wire that diameter is 10mm～15mm according to the sweetening agent of this invention, add-on is 2～5kg/ ton steel.Not containing corrodibility composition, reduce to a certain extent the temperature drop of molten steel according to the sweetening agent of this invention, improved desulfurization degree.
For another example: China Patent No.: 201410118031.7, patent name is: a kind of method of top and bottom complex blowing molten iron pre-desulfurization in hot metal ladle, the equipment using in the method is mainly by top-blown powder tank, bottom blowing powder injection tank, hot metal ladle, top-blown spray gun, bottom blowing ventilated element composition, angle α=10～20 ° that wherein keep between the rifle body of top-blown spray gun and hot metal ladle central axis, one end of top-blown spray gun is connected with top-blown powder tank, the other end of top-blown spray gun inserts the degree of depth of molten iron apart from hot metal ladle bottom surface 200～300mm, the muzzle of top-blown spray gun is centered close on hot metal ladle central axis, the rifle body medullary ray of top-blown spray gun and bottom blowing ventilated element medullary ray are all in the same vertical elevation through hot metal ladle bottom surface diameter, bottom blowing powder injection tank and bottom blowing ventilated element together with, bottom blowing ventilated element is centered close to 1/2nd places of hot metal ladle bottom surface radius, while using aforesaid device to carry out molten iron pre-desulfurization, take following method: (1) top-blown spray gun, taking nitrogen as carrier, is that 0.18～0.22MPa, nitrogen flow are ton iron 0.05～0.08Nm at jetting pressure
3under the condition of/min, with the winding-up intensity of ton iron 0.00～0.08kg/min, the magnesium powder in top-blown powder tank is jetted in molten steel, magnesium powder winding-up amount is 0～0.5kg/t molten iron, winding-up time 0～6min, and powder to air ratio is about 1.0kg/Nm
3, (2) bottom blowing nitrogen buffer gas is jetted desulfurization powder in bottom blowing powder injection tank to hot metal ladle by bottom blowing ventilated element, and jetting pressure 0.3～0.5MPa, nitrogen flow are ton iron 0.05～0.1Nm
3/ min, winding-up intensity is ton iron 0～0.4kg/min, and the winding-up amount of desulfurization powder is 0～4kg/t molten iron, and the winding-up time is 8～10min, and powder to air ratio is about 3kg/Nm
3.
Above two parts of patents all exist sweetening effectiveness poor, and the problem of high material consumption especially directly adds the sweetening agent of existing use, is difficult to accomplish the dark desulfurization of molten steel, and desulfurization precision is also uncontrollable.
Summary of the invention
1. the problem that will solve
Exist and be difficult to accomplish the dark desulfurization of molten steel for existing molten iron, molten steel desulfurizing, desulfurization precision is the problem of uncontrollable, high material consumption also, the invention provides a kind of molten iron, molten steel desulfurizing material and preparation method thereof, it can improve reactive behavior, desulfuration efficiency significantly improves, and has the features such as low, the quantity of slag is little that consume simultaneously.
2. technical scheme
In order to address the above problem, the technical solution adopted in the present invention is as follows:
A kind of molten iron, molten steel desulfurizing material, it is thread, is followed successively by from inside to outside inner core, magnesium ribbon, filler particles and steel band; The material of described inner core is magnesium silk or calcium silk, and wherein the composition of magnesium silk and massfraction are: Al:0.01～1.20%, and Si:0～2.10%, Mn:0～0.8%, Fe:0.01～3.20%, surplus is Mg; Composition and the massfraction of described calcium silk are: Al:0.40～1.80%, and Si:0～1.20, Mn:0～0.60%, Fe:0.03～2.50%, surplus is Ca; The composition of described magnesium ribbon and massfraction are: Al:0.1～1.5%, and Si:0.1～1.5%, Fe:0.1～1.5%, surplus is Mg; The composition of described steel band and mass percent are C:0.07～0.10%; Si :≤0.03%; Mn:0.21～0.60%; P :≤0.020%; S :≤0.025%; Al:0.03～0.06%; Cr :≤0.04%; Ni :≤0.01%; Cu :≤0.10%, surplus is Fe.
Preferably, the diameter of described inner core is 4-23mm, and the thickness of magnesium ribbon is 0.15-2.8mm, the particle diameter 0.1-4.5mm of filler particles, and the internal diameter of steel band is 8-28mm, the thickness of steel band is 0.22～0.65mm.
Preferably, the composition of described filler particles is according to the material decision of inner core, and in the time that the material of inner core is magnesium silk, in filler particles, the massfraction of Mg is 30～60%, and surplus is Ca; In the time that the material of inner core is calcium silk, in filler particles, the massfraction of Mg is 50～85%, and surplus is Ca.
Preferably, the granularity of described filler particles is according to the material decision of inner core, and in the time that the material of inner core is magnesium silk, the granularity of filler particles is 0.1～4.5mm; In the time that the material of inner core is calcium silk, the granularity of filler particles is 0.1～3.5mm.
Preferably, Passivation Treatment is carried out on the surface of described inner core; Described filler particles is through Passivation Treatment.
Molten iron, a molten steel desulfurizing preparation method for material, the steps include:
(1) select starting material: MAGNESIUM METAL or calcium metal; The composition of MAGNESIUM METAL and massfraction are: Al:0.01～1.20%, and Si:0～2.10%, Mn:0～0.8%, Fe:0.01～3.20%, surplus is Mg; The composition of calcium metal and massfraction are: Al:0.40～1.80%, and Si:0～1.20, Mn:0～0.60%, Fe:0.03～2.50%, surplus is Ca;
(2) MAGNESIUM METAL in step (1) and calcium metal are processed into respectively to excellent shaped material, again excellent shaped material is adopted to dedicated extruded molding device and technique, machine-shaping is MAGNESIUM METAL silk and calcium metal silk, its string diameter is ￠ 4-23mm, then MAGNESIUM METAL silk and calcium metal silk are carried out to surface passivation with silicone oil passivator;
(3) MAGNESIUM METAL is processed into flat type material, the composition of the MAGNESIUM METAL adopting and massfraction are: Al:0.1～1.5%, and Si:0.1～1.5%, Fe:0.1～1.5%, surplus is Mg; Again flat type magnesium material is processed into metal magnesium ribbon, the thickness of its magnesium ribbon is 0.15-2.8mm;
(4) metal MAG block and calcium metal piece are mixed in proportion, in the time that the material of inner core is magnesium silk, the massfraction of Mg is 30～60%, and surplus is Ca; In the time that the material of inner core is calcium silk, the massfraction of Mg is 50～85%, and surplus is Ca, put into vacuum oven and be smelted into alloy block, again its alloy block is broken into the particle of particle diameter 0.1-4.5mm, and its particle is carried out to Passivation Treatment with silicone oil passivator surface, obtain filler particles;
(5) selection component and mass percent are C:0.07～0.10%; Si :≤0.03%; Mn:0.21～0.60%; P :≤0.020%; S :≤0.025%; Al:0.03～0.06%; Cr :≤0.04%; Ni :≤0.01%; Cu :≤0.10%, the steel band that surplus is Fe;
(6) adopt cored-wire for unit the steel band in step (5) inner core in the magnesium ribbon in the filler particles in step (4), step (3) and step (2) is coated, be overmolding to and be followed successively by from inside to outside the thread of inner core, magnesium ribbon, filler particles and steel band.
3. beneficial effect
Than prior art, beneficial effect of the present invention is:
(1) the present invention adopts MAGNESIUM METAL calcium matrix material to contain MAGNESIUM METAL and two kinds of alkaline-earth metal of calcium metal simultaneously, the composition of magnesium silk and massfraction are: Al:0.01～1.20%, Si:0～2.10%, Mn:0～0.8%, Fe:0.01～3.20%, surplus is Mg; The composition of calcium silk and massfraction are: Al:0.40～1.80%, and Si:0～1.20, Mn:0～0.60%, Fe:0.03～2.50%, surplus is Ca; The composition of magnesium ribbon and massfraction are: Al:0.1～1.5%, and Si:0.1～1.5%, Fe:0.1～1.5%, surplus is Mg; The composition of steel band and mass percent are C:0.07～0.10%; Si :≤0.03%; Mn:0.21～0.60%; P :≤0.020%; S :≤0.025%; Al:0.03～0.06%; Cr :≤0.04%; Ni :≤0.01%; Cu :≤0.10%, surplus is Fe, adds in iron liquid and molten steel simultaneously, because of positive correlation effect, can improve reactive behavior, desulfuration efficiency significantly improves;
(2) molten iron of the present invention, molten steel desulfurizing can make the component proportions of MAGNESIUM METAL and calcium metal adjust in very wide scope by the preparation method of material, and its sulfur removal technology has adaptability widely, and desulfurization depth can accurately be controlled;
(3) no matter molten iron of the present invention, molten steel desulfurizing are molten iron pre-desulfurization with material, or the dark desulfurization of molten steel terminal, all can realize, and consume the Low Cost Mode operation of the feature such as low, the quantity of slag is little, iron loss is little, temperature drop is few;
(4) the huge change of material for molten iron of the present invention, molten steel desulfurizing, to more than 1/10th before installations and facilities being dropped into drop to, has reduced running cost simultaneously, and has avoided incident equipment and process accident in operational process;
(5) operational process safety and environmental protection of the present invention, smoke dust, without dust, odorlessness, significantly improves execute-in-place environment;
(6) the present invention, in molten steel desulfurizing process, can obtain good desulfurization, and deoxidation purifies the multinomial metallurgical effects such as steel night, than single desulfurization, and deoxidation, calcium processing has more superiority.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Embodiment
Describe the present invention below in conjunction with specific embodiment.
Embodiment 1
Prepare molten iron, molten steel desulfurizing material, the steps include:
(1) select starting material: MAGNESIUM METAL; The composition of MAGNESIUM METAL and massfraction are: Al:0.03%, and Si:1.20%, Mn:0.3%, Fe:2.10%, surplus is Mg; The composition of calcium metal and massfraction are: Al:0.7%, and Si:0.30, Mn:0.30%, Fe:1.40%, surplus is Ca;
(2) MAGNESIUM METAL in step (1) is processed into respectively to excellent shaped material, again excellent shaped material is adopted to dedicated extruded molding device and technique, machine-shaping is MAGNESIUM METAL silk, and its string diameter is ￠ 23mm, then MAGNESIUM METAL silk is carried out to surface passivation with silicone grease 295-3D;
(3) metal MAG block and calcium metal piece are mixed in proportion, the massfraction of Mg is 30%, and surplus is Ca; Put into vacuum oven and be smelted into alloy block, then its alloy block is broken into the particle of particle diameter 0.1-4.5mm, and its particle is carried out to Passivation Treatment with silicone grease 295-3D passivator, obtain filler particles;
(4) selection component and mass percent are C:0.08%; Si:0.02%; Mn:0.37%; P:0.020%; S:0.021%; Al:0.05%; Cr:0.02%; Ni:0.01%; Cu:0.10%, the steel band that surplus is Fe;
(5) adopt cored-wire for unit the steel band in step (4) inner core in the filler particles in step (3) and step (2) is coated, be overmolding to and be followed successively by from inside to outside the thread of inner core, filler particles and steel band, wherein the external diameter of steel band is 28mm, as shown in Figure 1.
It is 220 tons of iron ladles that molten iron, the molten steel desulfurizing material of preparing by step (6) regulates nominal capacity, hot metal composition: C:4.1%, Si:0.5%, Mn:0.3%, P:0.11%, S:0.13%, and surplus is Fe.In Hot Metal Pretreatment, directly MAGNESIUM METAL calcium matrix material cored-wire is fed to molten iron by feeding wire machine, wire-feeding velocity 120-150m/min, molten iron average desulfurization degree is 71.3%.
Embodiment 2
Prepare molten iron, molten steel desulfurizing material, the steps include:
(1) select starting material: calcium metal; The composition of calcium metal and massfraction are: Al:0.40%, and Si:1.20, Mn:0.1%, Fe:2.50%, surplus is Ca;
(2) calcium metal in step (1) is processed into respectively to excellent shaped material, again excellent shaped material is adopted to dedicated extruded molding device and technique, machine-shaping is MAGNESIUM METAL silk and calcium metal silk, and its string diameter is ￠ 4mm, then calcium metal silk is carried out to surface passivation with methyl-silicone oil;
(3) MAGNESIUM METAL is processed into flat type material, the composition of the MAGNESIUM METAL adopting and massfraction are: Al:0.1%, and Si:1.5%, Fe:0.1%, surplus is Mg; Again flat type magnesium material is processed into metal magnesium ribbon, the thickness of its magnesium ribbon is 2.8mm;
(4) metal MAG block and calcium metal piece are mixed in proportion, the massfraction of Mg is 85%, and surplus is Ca, put into vacuum oven and be smelted into alloy block, again its alloy block is broken into the particle of particle diameter 0.1-3.5mm, and its particle is carried out to Passivation Treatment with methyl-silicone oil, obtain filler particles;
(5) selection component and mass percent are C:0.07%; Si:0.03%; Mn:0.21%; P:0.020%; S:0.025%; Al:0.06%; Cr:0.04%; Ni:0.01%; Cu:0.10%, the steel band that surplus is Fe;
(6) adopt cored-wire for unit the steel band in step (5) inner core in the magnesium ribbon in the filler particles in step (4), step (3) and step (2) is coated, be overmolding to and be followed successively by from inside to outside the thread of inner core, magnesium ribbon, filler particles and steel band, thread external diameter equals 16min, as shown in Figure 1.
It is 120 tons of iron ladles that molten iron, the molten steel desulfurizing material of preparing by step (6) regulates nominal capacity, hot metal composition: C:4.4%, Si:0.6%, Mn:0.45%, P:0.13%, S:0.11%.Molten iron, the molten steel desulfurizing Material cladding material cored-wire feeding molten iron directly prepared by step (6) by feeding wire machine, wire-feeding velocity 80～110m/min, molten iron average desulfurization degree is 69.7%.
Embodiment 3
Prepare molten iron, molten steel desulfurizing material, the steps include:
(1) select starting material: MAGNESIUM METAL and calcium metal; The composition of MAGNESIUM METAL and massfraction are: Al:1.20%, and Si:0.1%, Mn:0.8%, Fe:0.01, surplus is Mg; The composition of calcium metal and massfraction are: Al:0.40%, and Si:1.20, Mn:0.60%, Fe:0.03, surplus is Ca;
(2) MAGNESIUM METAL in step (1) and calcium metal are processed into respectively to excellent shaped material, again excellent shaped material is adopted to dedicated extruded molding device and technique, machine-shaping is MAGNESIUM METAL silk and calcium metal silk, its string diameter is ￠ 16mm, then MAGNESIUM METAL silk and calcium metal silk are carried out to surface passivation with DRZ-1 heat-conducting silicone grease;
(3) MAGNESIUM METAL is processed into flat type material, the composition of the MAGNESIUM METAL adopting and massfraction are: Al:1.5%, and Si:0.1%, Fe:1.5%, surplus is Mg; Again flat type magnesium material is processed into metal magnesium ribbon, the thickness of its magnesium ribbon is 0.15mm;
(4) metal MAG block and calcium metal piece are mixed in proportion, in the time that the material of inner core is magnesium silk, the massfraction of Mg is 50, and surplus is Ca; In the time that the material of inner core is calcium silk, the massfraction of Mg is 60, and surplus is Ca, put into vacuum oven and be smelted into alloy block, again its alloy block is broken into the particle of particle diameter 0.1-3.5mm, and its particle is carried out to Passivation Treatment with DRZ-1 heat-conducting silicone grease, obtain filler particles;
(5) selection component and mass percent are C:0.10%; Si:0.01%; Mn:0.60%; P:0.010%; S:0.020%; Al:0.03%; Cr:0.04%; Ni:0.01%; Cu:0.08%, the steel band that surplus is Fe;
(6) adopt cored-wire for unit the steel band in step (5) inner core in the magnesium ribbon in the filler particles in step (4), step (3) and step (2) is coated, be overmolding to and be followed successively by from inside to outside the thread of inner core, magnesium ribbon, filler particles and steel band, as shown in Figure 1.
It is 70 tons of ladle that molten iron, the molten steel desulfurizing material of preparing by step (6) regulates nominal capacity, molten steel composition: C:0.22%, Si:0.53%, Mn:1.39%, P:0.022%, S:0.024%.The molten iron, the molten steel desulfurizing material that use step (6) to prepare, directly fed molten steel by feeding wire machine, wire-feeding velocity 110-130m/min, in molten steel, sulphur is all down to 0.008% material when inner core while being magnesium silk, average desulfurization degree is 62.5%, and in the time that the material of inner core is calcium silk, average desulfurization degree is 64%, have more superiority than single desulfurization, deoxidation, calcium processing, contrast cost significantly reduces.
Claims (6)
1. molten iron, a molten steel desulfurizing material, is characterized in that, it is thread, is followed successively by from inside to outside inner core, magnesium ribbon, filler particles and steel band; The material of described inner core is magnesium silk or calcium silk, and wherein the composition of magnesium silk and massfraction are: Al:0.01～1.20%, and Si:0～2.10%, Mn:0～0.8%, Fe:0.01～3.20%, surplus is Mg; Composition and the massfraction of described calcium silk are: Al:0.40～1.80%, and Si:0～1.20, Mn:0～0.60%, Fe:0.03～2.50%, surplus is Ca; The composition of described magnesium ribbon and massfraction are: Al:0.1～1.5%, and Si:0.1～1.5%, Fe:0.1～1.5%, surplus is Mg; The composition of described steel band and mass percent are C:0.07～0.10%; Si :≤0.03%; Mn:0.21～0.60%; P :≤0.020%; S :≤0.025%; Al:0.03～0.06%; Cr :≤0.04%; Ni :≤0.01%; Cu :≤0.10%, surplus is Fe.
2. a kind of molten iron according to claim 1, molten steel desulfurizing material, is characterized in that, the diameter of described inner core is 4-23mm, the thickness of magnesium ribbon is 0.15-2.8mm, the particle diameter 0.1-4.5mm of filler particles, the internal diameter of steel band is 8-28mm, the thickness of steel band is 0.22～0.65mm.
3. a kind of molten iron according to claim 1, molten steel desulfurizing material, it is characterized in that, the composition of described filler particles is according to the material decision of inner core, in the time that the material of inner core is magnesium silk, in filler particles, the massfraction of Mg is 30～60%, and surplus is Ca; In the time that the material of inner core is calcium silk, in filler particles, the massfraction of Mg is 50～85%, and surplus is Ca.
4. a kind of molten iron according to claim 3, molten steel desulfurizing material, is characterized in that, the thickness of described filler particles is according to the material decision of inner core, and in the time that the material of inner core is magnesium silk, the granularity of filler particles is 0.1～4.5mm; In the time that the material of inner core is calcium silk, the granularity of filler particles is 0.1～3.5mm.
5. a kind of molten iron according to claim 3, molten steel desulfurizing material, is characterized in that, Passivation Treatment is carried out on the surface of described inner core; Described filler particles is through Passivation Treatment.
6. molten iron, a molten steel desulfurizing preparation method for material, the steps include:
(1) select starting material: MAGNESIUM METAL or calcium metal; The composition of MAGNESIUM METAL and massfraction are: Al:0.01～1.20%, and Si:0～2.10%, Mn:0～0.8%, Fe:0.01～3.20%, surplus is Mg; The composition of calcium metal and massfraction are: Al:0.40～1.80%, and Si:0～1.20, Mn:0～0.60%, Fe:0.03～2.50%, surplus is Ca;
(2) MAGNESIUM METAL in step (1) and calcium metal are processed into respectively to excellent shaped material, again excellent shaped material is adopted to dedicated extruded molding device and technique, machine-shaping is MAGNESIUM METAL silk and calcium metal silk, its string diameter is ￠ 4-23mm, then MAGNESIUM METAL silk and calcium metal silk are carried out to surface passivation with silicone oil passivator;
(3) MAGNESIUM METAL is processed into flat type material, the composition of the MAGNESIUM METAL adopting and massfraction are: Al:0.1～1.5%, and Si:0.1～1.5%, Fe:0.1～1.5%, surplus is Mg; Again flat type magnesium material is processed into metal magnesium ribbon, the thickness of its magnesium ribbon is 0.15-2.8mm;
(4) metal MAG block and calcium metal piece are mixed in proportion, in the time that the material of inner core is magnesium silk, the massfraction of Mg is 30～60%, and surplus is Ca; In the time that the material of inner core is calcium silk, the massfraction of Mg is 50～85%, and surplus is Ca, put into vacuum oven and be smelted into alloy block, again its alloy block is broken into the particle of particle diameter 0.1-4.5mm, and its particle is carried out to Passivation Treatment with silicone oil passivator surface, obtain filler particles;
(5) selection component and mass percent are C:0.07～0.10%; Si :≤0.03%; Mn:0.21～0.60%; P :≤0.020%; S :≤0.025%; Al:0.03～0.06%; Cr :≤0.04%; Ni :≤0.01%; Cu :≤0.10%, the steel band that surplus is Fe;
(6) adopt cored-wire for unit the steel band in step (5) inner core in the magnesium ribbon in the filler particles in step (4), step (3) and step (2) is coated, be overmolding to and be followed successively by from inside to outside the thread of inner core, magnesium ribbon, filler particles and steel band.
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| TWI570246B (en) * | 2015-04-07 | 2017-02-11 | China Steel Corp | Method for desulfurization of molten iron |
| CN111690789A (en) * | 2020-06-12 | 2020-09-22 | 江苏戴美特医疗科技有限公司 | Core-spun yarn with high yield and manufacturing method thereof |
| CN112522541A (en) * | 2019-09-17 | 2021-03-19 | 东北大学 | Nickel-based alloy desulfurizing agent and preparation method thereof |
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| CN112522541A (en) * | 2019-09-17 | 2021-03-19 | 东北大学 | Nickel-based alloy desulfurizing agent and preparation method thereof |
| CN112522541B (en) * | 2019-09-17 | 2022-03-18 | 东北大学 | Nickel-based alloy desulfurizing agent and preparation method thereof |
| CN111690789A (en) * | 2020-06-12 | 2020-09-22 | 江苏戴美特医疗科技有限公司 | Core-spun yarn with high yield and manufacturing method thereof |
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