CN110218836A - Method for dealuminizing and purifying ferrosilicon - Google Patents

Method for dealuminizing and purifying ferrosilicon Download PDF

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Publication number
CN110218836A
CN110218836A CN201910398524.3A CN201910398524A CN110218836A CN 110218836 A CN110218836 A CN 110218836A CN 201910398524 A CN201910398524 A CN 201910398524A CN 110218836 A CN110218836 A CN 110218836A
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antaciron
ferrosilicon
liquid
alloy
furnace
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CN110218836B (en
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李德军
廖相巍
于赋志
许孟春
尚德礼
刘祥
黄玉平
吕春风
康伟
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C35/00Master alloys for iron or steel

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a method for dealuminizing and purifying ferrosilicon, which aims to reduce the use cost of alloy in the production process of enterprises, reduce the silicon burning loss in the dealuminizing and purifying process of the ferrosilicon alloy, improve the yield of the alloy, enhance the stable controllability of components in the dealuminizing and purifying process of the alloy, avoid alloy supplement in the later period and reduce the dealuminizing and purifying cost of the ferrosilicon alloy.

Description

A kind of ferrosilicon dealuminzation method of purification
Technical field
The invention belongs to alloys to purify refining art, more particularly to a kind of ferrosilicon dealuminzation method of purification.
Background technique
Antaciron is generally not required aluminum content as deoxidant for steelmaking and alloy addition.But smelting certain When a little special steel grades, such as smelting silicon steel, cord steel, Properties of Heavy Rail Steel, there is strict demand to the aluminium content in ferrosilicon.Due to ferrosilicon In process of production, a certain amount of aluminium is often brought into according to material quality difference, in particular by wollastonite and coke inferior Charcoal then brings that aluminium is higher into, thus cause the ferrosilicon of the same trade mark because aluminum content has biggish price difference, such as commonly use siliceous 75% ferrosilicon is differed with its price containing aluminium 0.3% containing aluminium 2% about at 3000 yuan or so, and it is negative that price difference increases steel mill's cost Load.In order to which the relatively cheap common ferrosilicon of price is transformed into the relatively expensive low aluminum silicon of price after dealuminzation purification processes Iron, it usually needs dealumination treatment is carried out to common Antaciron by the way of external refining.Main method of refining includes chlorine Change purifying method and oxidation refining method, but chlorination refining method causes serious pollution to the environment, cost of investment is high, gradually it is eliminated, and aoxidize essence Refining method is easy to operate, and cost of investment is low, and environmental pollution is small, is used by many manufacturing enterprises.Its principle of oxidation refining method be 0 is added in ferrosilicon liquid2、Fe203Equal oxidants, the aluminium in ferrosilicon liquid is removed.Although the oxidizing process being capable of partial removal ferrosilicon liquid Middle aluminium, but there is also certain deficiency, the 0 of addition2、Fe203Equal oxidants can also aoxidize the silicon in ferrosilicon liquid, ferrosilicon scaling loss compared with Seriously, the ferrosilicon recovery rate after the purification of ferrosilicon dealuminzation is low, and generally 85% or so, and the Composition Control of final products is difficult, The ferrosilicon for generally requiring to add the low aluminium of a certain amount of high-purity high silicon carrys out adjusting component, leads to that the production cost increases.
Summary of the invention
Expensive for the more common ferrosilicon of low aluminum silicon iron, the high status of enterprise's production cost and current ferrosilicon dealuminzation mention It is pure mainly to remove aluminium by the mode that oxidant is added, lead to that the scaling loss of silicon in Antaciron is big and Composition Control is difficult etc. no Foot, the present invention provide a kind of ferrosilicon dealuminzation method of purification, it is therefore intended that the use cost for reducing alloy in enterprise production process subtracts Silicon scaling loss in few Antaciron dealuminzation purification process, improves yield of alloy, enhances the stabilization of alloy dealuminzation purification process ingredient Controlling avoids the later period from adding alloy, reduces Antaciron dealuminzation cost for purification.
In order to realize goal of the invention, the technical solution adopted by the present invention is as follows:
A kind of its basic principle of ferrosilicon dealuminzation method of purification is as follows:
When being blown into nitrogen to high-temperature molten melt ferrosilicon, part nitrogen can be dissolved in ferrosilicon solution, and and Antaciron Calorize symphysis in liquid is reacted as follows at aluminum nitride inclusions object:
N2=2 [N] (1)
[Al]+[N]=AlN (2)
The aluminium in Antaciron liquid is removed it is necessary to change system condition, promotes the progress of reaction (2).Pass through thermodynamics Aluminum nitride particle will be precipitated it is found that when the concentration product of aluminium and nitrogen in Antaciron liquid reaches a certain level in analysis.In silicon In ferroalloy liquid, if aluminium content is 2%, when nitrogen content in aluminium alloy is improved to 0.02%, the generation of (2) reaction Aluminium nitride precipitation minimum temperature be 1583 DEG C.Therefore, the nitrogen point of dealuminzation effect and Antaciron liquid temperature, system The use of pressure and refining slag is related, improves Antaciron liquid temperature by analysis, increases system nitrogen partial pressure, and low melting point is low viscous Antaciron dealuminzation effect can be improved in the refining slag of degree.
A kind of ferrosilicon dealuminzation method of purification, it is characterised in that include the following steps:
Step 1: the Antaciron purified to dealuminzation being packed into induction heater, and is added the on Antaciron top A kind of refining slag, additional amount are the 10~20% of weight alloy, keep alloy not exposed;
Step 2: carrying out induction heating to Antaciron makes its fusing, while passing through air brick to silicon in the bottom of induction furnace Ferroalloy liquid is blown into nitrogen, and the amount of being blown into is by 5~20Nm3/ h control makes the area in rolling area in furnace account for liquid level 10~30% in furnace;
Step 3: reaching 2~5min when blowing time, after the air in induction heater is all discharged, in order to improve ferrosilicon Nitrogen content in aluminium alloy buckles bell on the fire door of induction heater, is maintained at the pressure in furnace higher than outside atmosphere Press the barotropic state of 0.01~0.05MPa;
Step 4: heating up to Antaciron liquid, the temperature of Antaciron liquid is controlled at 1600~1700 DEG C and kept 10~20min;
Step 5: opening bell, second of refining slag is added, additional amount is the 5~10% of weight alloy;
Step 6: slag to be refined is all after fusing, and bottom blown gas is adjusted to argon gas, and will the amount of being blown by 2~5Nm3/ h control System carries out weak stir process to aluminium alloy;
Step 7: during weak stir process, reducing the heating power of electric induction furnace, 5~10 are implemented to Antaciron liquid DEG C/min cooling, promote the nitrogen being dissolved in Antaciron liquid that combination reaction can occur with aluminium therein and forms aluminium nitride from silicon It is precipitated in ferroalloy liquid, the aluminium nitride being precipitated under the weak stirring of argon gas enters in the refining slag of melting state, completes ferrosilicon The dealuminzation of alloy;
Step 8: when the temperature of Antaciron liquid reaches higher than 30~50 DEG C of Antaciron fusing point, stop BOTTOM ARGON BLOWING, and Top slag in furnace is removed completely.
The refining slag of the step 1, chemical composition comprises the following components in percentage by weight meet following range: 75%~85% SiO2;10%~15% CaO;3%~5% Al2O3, surplus is alkali metal oxide, and alkali metal oxide includes Li2O、Na2O、K2One or more in O, graininess are the hollow ball-shape of 2~5mm of diameter;
The refining slag of the step 5, chemical composition comprises the following components in percentage by weight meet following range: 60%~80% CaF2;10%~30% CaO;10%~15% SiO2, graininess is that 50~100 mesh are powdered.
Using this method can get it is following the utility model has the advantages that 1) cheap common high ferro-silicon-aluminium can be transformed into price compared with The alloy use cost of steel-making can be reduced by 10~20% by high low aluminum silicon iron;2) it can reduce because alloy strip aluminium generates B class inclusion content, improve the cleanliness of steel grade;More other ferrosilicon dealuminzation methods of purification, this method can be avoided the scaling loss of ferrosilicon, Greatly improve recovery rate, the ferrosilicon recovery rate after purification can reach 90% or more.
Specific embodiment
It is illustrated combined with specific embodiments below:
Embodiment 1
Dealuminzation purification processes are carried out by siliceous 75% ferrosilicon of this method to aluminum content 3%, method is as follows:
Step 1: the Antaciron purified to dealuminzation being packed into induction heater, and is added the on Antaciron top A kind of refining slag, additional amount are the 12% of weight alloy, keep alloy not exposed;The SiO that refining slag is 80%2;12% CaO;3.5% Al2O3, surplus Li2O, graininess are the hollow ball-shape of diameter 2.5mm;
Step 2: carrying out induction heating to Antaciron makes its fusing, while passing through air brick to silicon in the bottom of induction furnace Ferroalloy liquid is blown into nitrogen, and the amount of being blown into is by 15Nm3/ h control makes the area in rolling area in furnace account for liquid level 18% in furnace;
Step 3: reaching 4min when blowing time, after the air in induction heater is all discharged, in induction heater Bell is buckled on fire door, and the pressure in furnace is made to be maintained at the barotropic state higher than external pressure 0.03MPa:;
Step 4: heating up to Antaciron liquid, the temperature of Antaciron liquid is controlled at 1630 DEG C and keeps 15min.
Step 5: open bell:, second of refining slag is added, additional amount is the 8% of weight alloy;Refining slag is 70% CaF2;20% CaO;10% SiO2, graininess is that 60 mesh are powdered.
Step 6: slag to be refined is all after fusing, and bottom blown gas is adjusted to argon gas, and will the amount of being blown by 3.5Nm3/ h control System carries out weak stir process to aluminium alloy.
Step 7: during weak stir process, reduce the heating power of electric induction furnace, to Antaciron liquid implement 7 DEG C/ Min cooling promotes the nitrogen being dissolved in Antaciron liquid that combination reaction can occur with aluminium therein and forms aluminium nitride from ferrosilicon It is precipitated in aluminium alloy, the aluminium nitride being precipitated under the weak stirring of argon gas enters in the refining slag of melting state, completes ferrosilicon and closes The dealuminzation of gold.
Step 8: when the temperature of Antaciron liquid reaches higher than 40 DEG C of Antaciron fusing point, stopping BOTTOM ARGON BLOWING, and by furnace Interior top slag removes completely;
Step 9: by treated, the casting of Antaciron liquid makes its solidification, and it is stand-by to be broken into block later.
By this method, the aluminium content of ferrosilicon can be reduced to 0.5%, and aluminium removal efficiency reaches 83%, and the ferrosilicon after purification closes Golden recovery rate is 91%.
Embodiment 2
Dealuminzation purification processes are carried out by siliceous 75% ferrosilicon of this method to aluminum content 2%, method is as follows:
Step 1: the Antaciron purified to dealuminzation being packed into induction heater, and is added the on Antaciron top A kind of refining slag, additional amount are the 15% of weight alloy, keep alloy not exposed;Its chemical component is by weight percentage are as follows: 75% SiO2;15% CaO;4.5% Al2O3, surplus Na2O, graininess are the hollow ball-shape of diameter 3mm;
Step 2: carrying out induction heating to Antaciron makes its fusing, while passing through air brick to silicon in the bottom of induction furnace Ferroalloy liquid is blown into nitrogen, and the amount of being blown into is by 18Nm3/ h control makes the area in rolling area in furnace account for liquid level 15% in furnace;
Step 3: reaching 4.5min when blowing time, after the air in induction heater is all discharged, in induction heater Fire door on buckle bell, so that the pressure in furnace is maintained at the barotropic state higher than external pressure 0.04MPa:;
Step 4: heating up to Antaciron liquid, the temperature of Antaciron liquid is controlled at 1650 DEG C and keeps 16min.
Step 5: open bell:, second of refining slag is added, additional amount is the 10% of weight alloy;Its chemical component By weight percentage are as follows: 80% CaF2;15% CaO;5% SiO2, graininess is that 50 mesh are powdered.
Step 6: slag to be refined is all after fusing, and bottom blown gas is adjusted to argon gas, and will the amount of being blown by 3.0Nm3/ h control System carries out weak stir process to aluminium alloy.
Step 7: during weak stir process, reduce the heating power of electric induction furnace, to Antaciron liquid implement 6 DEG C/ Min cooling promotes the nitrogen being dissolved in Antaciron liquid that combination reaction can occur with aluminium therein and forms aluminium nitride from ferrosilicon It is precipitated in aluminium alloy, the aluminium nitride being precipitated under the weak stirring of argon gas enters in the refining slag of melting state, completes ferrosilicon and closes The dealuminzation of gold.
Step 8: when the temperature of Antaciron liquid reaches higher than 45 DEG C of Antaciron fusing point, stopping BOTTOM ARGON BLOWING, and by furnace Interior top slag removes completely;
Step 9: by treated, the casting of Antaciron liquid makes its solidification, and it is stand-by to be broken into block later.
By this method, the aluminium content of ferrosilicon can be reduced to 0.3%, and aluminium removal efficiency reaches 85%, and the ferrosilicon after purification closes Golden recovery rate is 93%.

Claims (3)

1. a kind of ferrosilicon dealuminzation method of purification, it is characterised in that include the following steps:
The Antaciron purified to dealuminzation is packed into induction heater by step 1), and the first is added on Antaciron top Refining slag, additional amount are the 10~20% of weight alloy, keep alloy not exposed;
Step 2), which carries out induction heating to Antaciron, makes its fusing, while being closed by air brick to ferrosilicon in the bottom of induction furnace Golden liquid is blown into nitrogen, and the amount of being blown into is by 5~20Nm3/ h control makes the area in rolling area in furnace account for liquid level 10~30% in furnace;
Step 3) reaches 2~5min when blowing time, after the air in induction heater is all discharged, in order to improve Antaciron Nitrogen content in liquid buckles bell on the fire door of induction heater, is maintained at the pressure in furnace higher than external pressure The barotropic state of 0.01~0.05MPa;
Step 4) heats up to Antaciron liquid, the temperature of Antaciron liquid is controlled at 1600~1700 DEG C and keep 10~ 20min;
Step 5) opens bell, and second of refining slag is added, and additional amount is the 5~10% of weight alloy;
Step 6) slag to be refined is all after fusing, and bottom blown gas is adjusted to argon gas, and will the amount of being blown by 2~5Nm3/ h control;
Step 7) reduces the heating power of electric induction furnace, implements 5~10 DEG C/min cooling to Antaciron liquid;
Step 8) stops BOTTOM ARGON BLOWING when the temperature of Antaciron liquid reaches higher than 30~50 DEG C of Antaciron fusing point, and by furnace Interior top slag removes completely.
2. ferrosilicon dealuminzation method of purification according to claim 1, it is characterised in that the refining dreg chemistry of the step 1) at Divide and meets following range: 75%~85% SiO by weight percentage2;10%~15% CaO;3%~5% Al2O3, surplus is alkali metal oxide, and alkali metal oxide includes Li2O、Na2O、K2One or more in O, Granular state is the hollow ball-shape of 2~5mm of diameter.
3. ferrosilicon dealuminzation method of purification according to claim 1, it is characterised in that the refining dreg chemistry of the step 5) at Divide and meets following range: 60%~80% CaF by weight percentage2;10%~30% CaO;10%~15% SiO2, graininess is that 50~100 mesh are powdered.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111304523A (en) * 2020-03-31 2020-06-19 西安宏信矿热炉有限公司 Production process of low-aluminum ferrosilicon

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JPH06264114A (en) * 1993-03-11 1994-09-20 Isuzu Motors Ltd Production of thermoelectric material powder and apparatus for production thereof
JPH09227236A (en) * 1996-02-23 1997-09-02 Nippon Steel Corp Silicon nitride-base sintered compact and its production
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JPH06264114A (en) * 1993-03-11 1994-09-20 Isuzu Motors Ltd Production of thermoelectric material powder and apparatus for production thereof
JPH09227236A (en) * 1996-02-23 1997-09-02 Nippon Steel Corp Silicon nitride-base sintered compact and its production
CN1190135A (en) * 1997-12-17 1998-08-12 水利部丹江口水利枢纽管理局铁合金厂 Production process of high-quality ferrosilicon
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CN110016557A (en) * 2019-05-15 2019-07-16 东北大学 The method for producing ferro-silicon-aluminium as raw material electric arc furnace smelting using aluminium ash

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111304523A (en) * 2020-03-31 2020-06-19 西安宏信矿热炉有限公司 Production process of low-aluminum ferrosilicon

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