CN110055452B - Low-titanium ferrophosphorus, preparation method and application - Google Patents

Low-titanium ferrophosphorus, preparation method and application Download PDF

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CN110055452B
CN110055452B CN201910389957.2A CN201910389957A CN110055452B CN 110055452 B CN110055452 B CN 110055452B CN 201910389957 A CN201910389957 A CN 201910389957A CN 110055452 B CN110055452 B CN 110055452B
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titanium
ferrophosphorus
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ammonia
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CN110055452A (en
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章俊
丁德胜
孟令辉
王美晨
尹振兴
肖赛君
范鼎东
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Anhui University of Technology AHUT
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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
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

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  • Engineering & Computer Science (AREA)
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Abstract

The invention discloses a low-titanium ferrophosphorus, a preparation method and application thereof, wherein the preparation method comprises the following steps: adding the high-titanium ferrophosphorus and the adsorption slag into a container for melting to obtain a molten clear material; blowing nitrogen or ammonia into the molten clear material from the bottom of the container under the condition of 1500-1650K for converting; after blowing is finished, slagging off and tapping iron in a molten state to obtain low-titanium ferrophosphorus, wherein the high-titanium ferrophosphorus comprises the following components in parts by weight: p: 22-28%, Si is less than or equal to 3%, C is less than or equal to 1%, S is less than or equal to 0.05%, Mn is less than or equal to 2%, Cr is less than or equal to 1%, Ti: 0.1-4%, and the balance of Fe, wherein the prepared low-titanium ferrophosphorus comprises the following components in parts by weight: p: 23-25%, Si: 1.7-2.8%, C: 0.8-0.9%, S: 0.05-0.08%, Mn: 0.8-1.7%, Cr: 0.6-0.8 percent of Ti, less than 0.05 percent of Ti and the balance of Fe, the method for preparing the low-titanium ferrophosphorus has the advantages of short process flow, simple process operation and small environmental pollution, and the titanium content of the prepared low-titanium ferrophosphorus is less than 0.05 percent.

Description

Low-titanium ferrophosphorus, preparation method and application
Technical Field
The invention belongs to the technical field of pure ferroalloy smelting production, and particularly relates to low-titanium ferrophosphorus, a preparation method and application thereof.
Background
High-quality silicon steel with excellent electromagnetic properties needs to reduce the titanium content in the product as much as possible, because titanium, carbon, oxygen, nitrogen and other components in the steel can form fine titanium oxide, titanium nitride or titanium carbide inclusions which are difficult to discharge, the cleanliness of the molten steel is reduced, the growth of crystal grains in the annealing process is inhibited, and the electromagnetic properties of the silicon steel finished product are reduced.
Since phosphorus can improve the casting properties of silicon steel, silicon steel generally contains higher phosphorus. Ferrophosphorus is commonly used as an additive of phosphorus in silicon steel production. At present, with the further improvement of the requirement of high-quality silicon steel on the titanium content, the requirement that the titanium content is less than 10ppm and the requirement of common ferrophosphorus with the titanium content of 0.1-4 percent is difficult to meet is met. Although the adverse effect caused by the addition of the high-titanium ferrophosphorus is reduced by controlling the oxygen content in the refining process and optimizing the adding mode of the ferrophosphorus in the steelmaking process, the titanium content in the high-quality silicon steel is difficult to stably control due to the overhigh titanium content and large component fluctuation in the common ferrophosphorus, and therefore, the production of the low-titanium ferrophosphorus for the high-quality silicon steel is urgently needed to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the titanium content in the common ferrophosphorus is too high, which can not meet the production requirement of high-quality silicon steel, and provides the low-titanium ferrophosphorus, the preparation method and the application.
The invention solves the technical problems through the following technical scheme, and the preparation method of the low-titanium ferrophosphorus comprises the following steps:
(1) melting down: the weight ratio of the high-titanium ferrophosphorus to the adsorption slag is 8-15: 1, adding the mixture into a container for melting, and keeping the temperature for 3-6 minutes at 1500-1650K to obtain a melt-cleared substance;
(2) blowing: blowing nitrogen or ammonia into the molten clear material from the bottom of the container under the condition of 1500-1650K for converting;
(3) tapping: after the blowing is finished, slagging off and tapping iron in a molten state to obtain the low-titanium ferrophosphorus.
In the step (1), the high titanium ferrophosphorus comprises the following components by weight:
P：22～28％；
Si≤3％；
C≤1％；
S≤0.05％；
Mn≤2％；
Cr≤1％；
Ti：0.1～4％；
the balance being Fe.
In the step (1), the adsorption slag comprises the following components in parts by weight:
MnO：10～14％；
SiO2：25～28％；
CaO：28～32％；
Al2O3：10～14％；
CaF2：8～10％；
the balance being FeO.
In the step (1), the molten steel container is a medium-frequency induction furnace.
In the step (2), nitrogen or ammonia is blown into the melt-down material in two stages.
In the step (2), nitrogen or ammonia is blown into the high titanium-phosphorus-iron alloy at the first stage, wherein the amount of the nitrogen or ammonia is 300-800 liters per 100 kilograms, and the blowing flow rate is 100-200 liters per minute.
In the step (2), nitrogen or ammonia is blown into the high titanium-phosphorus-iron alloy in the second stage at a flow rate of 50-100 liters/100 kilograms, and the blowing flow rate is 30-50 liters/minute.
In the step (3), the prepared low-titanium ferrophosphorus comprises the following components in parts by weight:
P：23～25％；
Si：1.7～2.8％；
C：0.8～0.9％；
S：0.05～0.08％；
Mn：0.8～1.7％；
Cr：0.6～0.8％；
Ti＜0.05％；
the balance being Fe.
A low-titanium ferrophosphorus prepared by a preparation method of the low-titanium ferrophosphorus.
An application of low-titanium ferrophosphorus in preparing high-quality silicon steel.
The invention relates to a method for preparing low-titanium ferrophosphorus from high-titanium ferrophosphorus, wherein in the preparation process, adsorption slag is melted in the melting process, nitrogen or ammonia is blown into the melt in two stages, the nitrogen or ammonia is blown into the melt in the first stage, on one hand, the impurities such as titanium nitride, titanium carbide and titanium oxide existing in the high-titanium ferrophosphorus are blown up by gas stirring, bubble adsorption and floating action and are adsorbed by the melted adsorption slag, so that the existing titanium-containing impurities in the high-titanium ferrophosphorus are removed, on the other hand, the nitrogen or ammonia reacts with the titanium dissolved in the high-titanium ferrophosphorus to generate titanium nitride, newly generated titanium nitride, and the nitrogen or ammonia gas blown into the melt in the second stage is stirred, The molten adsorption slag is blown up under the action of bubble adsorption and floating and is adsorbed by the molten adsorption slag, so that the titanium in a dissolved state in the high-titanium ferrophosphorus is removed, the low-titanium ferrophosphorus is finally prepared, the density of the molten adsorption slag capable of adsorbing impurities is low, the molten adsorption slag floats on the upper layer of a melting vessel, the density of the low-titanium ferrophosphorus is high, the low-titanium ferrophosphorus sinks on the lower layer, and the separation of the molten adsorption slag and the low-titanium ferrophosphorus can be realized by pouring the low-titanium ferrophosphorus after slag skimming in a molten state.
Compared with the prior art, the invention has the following advantages:
1. the method adopts cheap nitrogen or ammonia gas as a titanium removing agent, removes the existing titanium-containing impurities in the ferrophosphorus by gas stirring, bubble adsorption and floating action, simultaneously generates titanium nitride by the reaction of the nitrogen or ammonia gas and the dissolved titanium and removes the titanium nitride along with the floating of bubbles, and completely reduces the titanium content in the high-titanium ferrophosphorus.
2. Besides absorbing the impurities containing titanium, the air-blowing stirring and the absorption slag also have the function of removing components in the form of inclusions such as chromium, silicon and the like in the high-titanium ferrophosphorus.
3. The method for preparing the low-titanium ferrophosphorus by the titanium removal of the high-titanium ferrophosphorus has the advantages of short process flow, simple process operation and little environmental pollution.
Drawings
FIG. 1 is an SEM image and an EDS energy spectrum analysis image of a titanium-containing phase in high-titanium ferrophosphorus;
FIG. 2 is an SEM image and an EDS energy spectrum analysis image of a metal substrate in low-titanium ferrophosphorus;
FIG. 3 is an SEM image and an EDS energy spectrum analysis image of non-metallic inclusion phases in the low-titanium ferrophosphorus.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
Adding 500 kg of high titanium ferrophosphorus and 33 kg of adsorption slag into a medium frequency induction furnace for melting down, wherein the adopted high titanium ferrophosphorus comprises the following components by weight: 25% of P, Si: 3%, C: 1%, S: 0.05%, Mn: 1%, Cr: 0.8 percent of Ti, 2.2 percent of Ti and the balance of Fe, wherein the adsorption slag comprises the following components in parts by weight: MnO 14%, SiO2:27％，CaO:32％，Al2O3:12％，CaF2:9％，FeO:6％。
The temperature after melting down is 1500K, blowing nitrogen for converting is started after melting down, the blowing air quantity in the first stage of blowing is 300L/100 kg ferrophosphorus, the flow is controlled at 100L/min, and the blowing time is 15 min; the blowing gas amount in the second stage is 50 liters per 100 kilograms of ferrophosphorus, the flow rate is controlled at 30 liters per minute, and the blowing time is 9 minutes.
After the blowing is finished, slagging off and tapping iron in a molten state to obtain 480 kg of low-titanium ferrophosphorus.
As shown in figure 1, an SEM image and an EDS energy spectrum analysis image of a titanium-containing phase in the high-titanium ferrophosphorus are provided, and the energy spectrum shows that the spectral line of titanium is obvious, which indicates that the titanium content in the raw material high-titanium ferrophosphorus is higher, as shown in figures 2 and 3, the SEM image and the EDS energy spectrum analysis image of a metal substrate and a non-metal inclusion phase of the prepared low-titanium ferrophosphorus are provided respectively, and the spectral line of titanium is not found in the energy spectrum of the metal substrate or the non-metal inclusion phase, which indicates that the titanium content in the prepared low-titanium ferrophosphorus is extremely low.
According to chemical analysis, the prepared low-titanium phosphorus iron component is tested and comprises the following components in percentage by weight:
P：25％，Si：2.8％，C：0.8％，S：0.05％，Mn：0.8％，Cr：0.8％，Ti：0.04％，Fe：69.71％。
example 2
Adding 500 kg of high titanium ferrophosphorus and 45 kg of adsorption slag into a medium frequency induction furnace for melting down, wherein the adopted high titanium ferrophosphorus comprises the following components by weight: 23% of P, Si: 2%, C: 0.8%, S: 0.05%, Mn: 2%, Cr: 0.9 percent of Ti, 1.4 percent of Ti and the balance of Fe, wherein the adsorption slag comprises the following components in parts by weight: MnO: 12% of SiO2：28％，CaO：32％，Al2O3：10％，CaF2：10％，FeO:8％。
The temperature after melting down is 1590K, ammonia gas is blown for converting after melting down, the blowing gas amount is 500L/100 kg ferrophosphorus in the first stage of blowing, the flow is controlled at 150L/min, the blowing time is 17 min, the blowing gas amount is 70L/100 kg ferrophosphorus in the second stage, the flow is controlled at 45L/min, and the blowing time is 8 min.
After blowing is finished, slagging off and tapping are carried out in a molten state, the density of slag is small, the slag floats on the upper surface, the density of iron is large, the slag sinks on the lower surface, the molten iron is poured out after slag is obliquely tapped in the molten state, and 470 kg of low-titanium ferrophosphorus with the titanium content lower than 0.05 percent can be obtained.
According to chemical analysis, the prepared low-titanium phosphorus iron component is tested and comprises the following components in percentage by weight:
P：23％，Si：1.7％，C：0.8％，S：0.05％，Mn：1.7％，Cr：0.8％，Ti：0.03％，Fe：71.92％。
example 3
Adding 500 kg of high titanium ferrophosphorus and 62.5 kg of adsorption slag into a medium frequency induction furnace for melting down, wherein the adopted high titanium ferrophosphorus comprises the following components by weight: 23% of P, Si: 2%, C: 0.8%, S: 0.05%, Mn: 2%, Cr: 0.9 percent of Ti, 1.4 percent of Ti and the balance of Fe, wherein the adsorption slag comprises the following components in parts by weight: MnO: 12% of SiO2：26％，CaO：31％，Al2O3：12％，CaF2：9％，FeO:10％。
The temperature after melting down is 1650K, blowing ammonia gas for converting, the blowing gas amount in the first stage of blowing is 800L/100 kg high titanium phosphorus iron, the flow is controlled at 200L/min, and the blowing time is 20 min. The blowing gas amount in the second stage is 100 liters per 100 kilograms of high titanium phosphorus iron, the flow rate is controlled at 50 liters per minute, and the blowing time is 10 minutes.
After the blowing is finished, 470 kg of low-titanium ferrophosphorus with the titanium content lower than 0.05 percent is obtained by slagging off and tapping iron in a molten state.
According to chemical analysis, the prepared low-titanium phosphorus iron component is tested and comprises the following components in percentage by weight:
P：22％，Si：1.7％，C：0.8％，S：0.05％，Mn：1.7％，Cr：0.8％，Ti：0.03％，Fe：72.92％。
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. The preparation method of the low-titanium ferrophosphorus is characterized by comprising the following steps of:
(1) melting down: the weight ratio of the high-titanium ferrophosphorus to the adsorption slag is 8-15: 1, adding the mixture into a container for melting, and keeping the temperature for 3-6 minutes at 1500-1650K to obtain a melt-cleared substance;
(2) blowing: blowing nitrogen or ammonia into the molten clear material from the bottom of the container under the condition of 1500-1650K for converting;
(3) tapping: after the blowing is finished, slagging off and tapping iron in a molten state to obtain low-titanium ferrophosphorus;
the prepared low-titanium phosphorus iron comprises the following components in percentage by weight:
P：23～25%；
Si：1.7～2.8%；
C：0.8～0.9%；
S：0.05～0.08%；
Mn：0.8～1.7%；
Cr：0.6～0.8%；
Ti＜0.05%；
the balance being Fe;
in the step (1), the adsorption slag comprises the following components in parts by weight:
MnO：10～14%；
SiO2：25～28%；
CaO：28～32%；
Al2O3：10～14%；
CaF2：8～10%；
the balance being FeO;
in the step (2), nitrogen or ammonia is blown into the molten mass in two stages;
in the step (2), nitrogen or ammonia is blown into the high titanium-phosphorus-iron alloy at the first stage, wherein the amount of the nitrogen or ammonia is 300-800 liters per 100 kilograms, and the blowing flow rate is 100-200 liters per minute;
in the step (2), nitrogen or ammonia is blown into the high titanium-phosphorus-iron alloy in the second stage at a flow rate of 50-100 liters/100 kilograms, and the blowing flow rate is 30-50 liters/minute.
2. The method for preparing low-titanium ferrophosphorus according to claim 1, wherein in the step (1), the high-titanium ferrophosphorus comprises the following components by weight:
P：22～28%；
Si≤3%；
C≤1%；
S≤0.05%；
Mn≤2%；
Cr≤1%；
Ti：0.1～4%；
the balance being Fe.
3. The method for preparing low-titanium ferrophosphorus according to claim 1, wherein in the step (1), the molten iron container is a medium frequency induction furnace.
4. A low-titanium ferrophosphorus prepared by the method of any one of claims 1 to 3.
5. Use of the low-titanium ferrophosphorus of claim 4 in the production of high quality silicon steel.
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CN104561765A (en) * 2013-10-13 2015-04-29 徐广哲 Iron alloy additive containing low titanium and phosphorus and use method of iron alloy additive
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