CN108220521A - A kind of desiliconization of hot metal agent and its application method using iron red mud as matrix - Google Patents

A kind of desiliconization of hot metal agent and its application method using iron red mud as matrix Download PDF

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Publication number
CN108220521A
CN108220521A CN201611142386.5A CN201611142386A CN108220521A CN 108220521 A CN108220521 A CN 108220521A CN 201611142386 A CN201611142386 A CN 201611142386A CN 108220521 A CN108220521 A CN 108220521A
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China
Prior art keywords
desiliconization
red mud
iron
agent
hot metal
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CN201611142386.5A
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Chinese (zh)
Inventor
姜喆
车玉满
郭天永
孙鹏
姚硕
武吉
王超
庞克亮
胡攀
王婷
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Priority to CN201611142386.5A priority Critical patent/CN108220521A/en
Publication of CN108220521A publication Critical patent/CN108220521A/en
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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
    • C21C1/00Refining of pig-iron; Cast iron
    • C21C1/02Dephosphorising or desulfurising
    • C21C1/025Agents used for dephosphorising or desulfurising
    • 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
    • C21C1/00Refining of pig-iron; Cast iron
    • C21C1/04Removing impurities other than carbon, phosphorus or sulfur

Abstract

The present invention discloses a kind of desiliconization of hot metal agent using iron red mud as matrix and application method, is made of by mass percentage following components:Iron red mud 70%~90%, magnesium slag 10%~25%, between control desiliconization agent dual alkalinity 0.6~1.2;The iron red mud ingredient:Fe2O335~55%, Al2O310~20%, Na2O 5~15%, remaining ingredient are SiO2、TiO2, CaO and impurity;Calcium oxide content >=55%, content of magnesia >=6% and dioxide-containing silica≤35% in the magnesium slag.Before blast furnace casting or when tapping a blast furnace, dry desiliconization of hot metal agent is added to according to the addition of 20~40kg/t of molten iron per ton in hot-metal bottle.

Description

A kind of desiliconization of hot metal agent and its application method using iron red mud as matrix
Technical field
The invention belongs to field of steel metallurgy more particularly to a kind of as the desiliconization of hot metal agent of matrix and its made using iron red mud Use method.
Background technology
Red mud is the solid waste that alumina producer production alumina process China and foreign countries incidentally generate, and generally often produces one ton Aluminium oxide will generate 1~1.8 ton of red mud, and the heap in China in 2015 high-volume has reached more than 300,000,000 tons, and the storage of red mud is not only It occupies a large amount of soil, pollution environment and there is serious security risks.In red mud in addition to containing Al, Fe, Si, also contain There are a variety of rare and scatter elements such as a certain amount of Ga, Sc, In and Na2O, especially with outer row's red mud after alumina producing Bayer process, Its iron content is generally between 30%~60%, thus to recycle value higher for this iron red mud, but due to iron red mud Middle aluminium oxide and alkali metal content are high, fundamentally cannot be used conventional blast furnace ironmaking, at present in the industrial production still cannot be a large amount of It utilizes.
Containing a large amount of CaO in reduced slag after magnesium's smelting (magnesium slag), also containing a certain amount of SiO2, MgO and Fe2O3.Its Middle CaO, MgO and Fe2O3Advantageous to silicon removal pretreatment of molten iron, magnesium slag belongs to the industrial waste of magnesium metal manufacturing enterprise, often at present It is handled using the method for being poured over wasteland or filling gully.Fine powder content is high in metal magnesium slag, and particle of the granularity less than 100 μm reaches To more than 60, it be easy to cause air pollution.In addition, magnesium slag has strong alkalinity, easily make the salinization of soil.It is therefore desirable to The metal magnesium slag for being is reasonably utilized.
Phosphorus is the harmful element in steel, therefore to be removed.The phosphorus content general control in steel exists in the conventional technology 0.010% hereinafter, the phosphorus content general control in some clean steels and special steel below 0.005%.To realize this target Most of steel plant are removed the phosphorus in molten iron by the way of molten iron pretreatment.But dephosphorization of molten iron is oxidation process, to During iron liquid oxygen blast or oxygen supply, therefore, before dephosphorization silicon wants first desiliconization, only silicon drops to centainly in molten iron prior to phosphorus oxidation After level, phosphorus could be aoxidized significantly.
Desiliconization agent is to provide the material of oxygen source as host agent, to adjust basicity of slag, improve the flux of slag fluidity to be secondary Agent.Desiliconization agent host agent is broadly divided into oxidant, and oxidant has solid oxidizer and gaseous oxidant.Solid oxidizer mainly has: Iron ore, pellet, sinter, steel rolling iron sheet, steel-making dedusting dust, gaseous oxidant mainly have oxygen.Also add in addition to host agent Enter a small amount of secondary agent, common pair agent mainly has lime, fluorite, CaO+CaF2、Na2CO3And converter slag etc..
There are mainly two types of modes for the desiliconization mode of molten iron, and one kind is can be in throwings such as blast furnace iron outlet groove, swing spout, hot-metal bottles Desiliconization agent is spread, another increases special equipment and uses injection method in converter or hot-metal bottle etc..
In recent years, as people are to the pay attention to day by day of environmental protection, the processing and utilization of industrial waste are always development ring One of difficult point of border close friend and circular economy, people constantly propose the new method that industrial waste recycles:
A kind of (the side of rotary hearth furnace direct-reduction iron red mud production Iron concentrate of Chinese Patent Application No. 201210275869.8 Method) a kind of method of rotary hearth furnace direct-reduction iron red mud production Iron concentrate is disclosed, step includes:1. iron red mud is carried out It after drying and processing, carries out dispensing by a certain percentage with reducing agent, mix, pressure ball, green-ball is made;2. green-ball is put into rotary hearth furnace It is restored, metallized pellet is made;3. cooled down, crushed to above-mentioned metallized pellet, magnetic separation and gravity treatment, iron essence is made Powder.It is low through Iron concentrate iron content obtained by multi-stage magnetic separation that this method efficiently solves iron red mud in the prior art, Al2O3、Na2O content The problem of high, present invention gained Iron concentrate quality meet steel plant's ingredient requirement, and efficient utilize for iron red mud provides outlet.
Chinese Patent Application No. 201210436465.2 is (a kind of to comprehensively utilize iron red mud with rotary hearth furnace pearl iron process Method) method that discloses a kind of rotary hearth furnace pearl iron process comprehensive utilization iron red mud, it is related to extracting, being rich for iron in iron red mud Collection and red mud recycling, it is characterised in that using iron red mud, carbonaceous reducing agent and additive be raw material, by dispensing, Mixing and pelletizing, rotary hearth furnace reduction melt point, pearl iron and melting slag is made in broken, magnetic separation process.
Above-mentioned patent Shortcomings are, although above two method is all to select rotary hearth furnace as production equipment, although turning Iron red mud can be effectively treated in bottom stove direct-reduction technique, recycle valuable element, but rotary hearth furnace production technology production cost It is higher with cost of equipment maintenance, it is unfavorable for mass producing.
(a kind of iron red mud is used as the recycling of steelmaking slag agent/Dephosphorising agent to Chinese Patent Application No. 201410176170.5 Reuse method) disclose a kind of iron red mud be used as steelmaking slag agent/Dephosphorising agent recycling method, the present invention be by Air-dry it is levigate after red mud and lime with 1:0.6~0.8 mass ratio mixing, for steelmaking slag agent/Dephosphorising agent, the patent Only by it is levigate mixed to 200 lime and red mud now after, in the dry pot equipped with molten iron is poured into, in 1350~1400 DEG C of items 1 hour is kept the temperature together with molten iron under part, completes dephosphorization, silicon experiment, dephosphorization rate can reach more than 76%, and molten iron silicon content reduces To 0.1%, the recycling to red mud is realized, but produced on-site process rhythm is fast, silicon removal pretreatment of molten iron and phosphorus process (within the general 10min of overall process) and convertor steelmaking process (within the general 20min of the overall process) time that will seek quickness are short, the utilization Red mud desiliconization and the method for dephosphorization, can not meet steel plant's production requirement.And the patent iron oxide content is low, it can not be shorter Effective desiliconization is completed in time.
Chinese Patent Application No. 201310402154.9 (a kind of method of high temperature iron bath processing iron red mud) discloses one The method of kind of the high temperature iron bath processing red mud of high ferro, by iron red mud, carbon raw material and additive according to additive 4%~ Fixed carbon phosphorus content in 10wt%, carbon raw material is rubbed with ferriferous oxide, the oxygen element of na oxide in iron red mud used You mix than the ratio for C/O=1.1~1.4, and red mud agglomerate is made;The addition of , An≤50kg/t adds in during blast furnace casting In molten iron, bathe environment using high temperature iron and molten iron impacts, stirring action makes the ferro element in red mud quickly restore, and recycles red mud In iron.This method is simple and practicable, is not required to increase special device and equipment, realizes that iron, aluminium, alkali metal in iron red mud are high Effect separation.Realize the efficient utilization of iron red mud.This method makes because adding a certain amount of carbonaceous material in dispensing in red mud Iron oxide has higher iron recovery, but oxidisability is insufficient in red mud agglomerate, and silicon removal pretreatment of molten iron ability is low.And because To add carbon dust in the pelletizing, the iron oxide and carbon vigorous reaction in molten iron be easy to causeing in pelletizing generate smog, influence Operating environment.
Invention content
To overcome Shortcomings in above-mentioned patent and document, the technical problems to be solved by the invention are to provide one kind with red Silicon removal pretreatment of molten iron agent and its application method of the mud for raw material preparation, while good desiliconization effect is reached, are fully returned It receives using the iron resource in iron red mud, utilizes the iron oxide and Na of the high-content in iron red mud2O reduces desiliconization agent fusing point, Make desiliconization agent rapid melting slagging, improve desilication efficiency and be conducive to environmental protection and waste recycling.
The present invention seeks to what is realized by following technical solution:
Containing higher sodium oxide molybdena and iron oxide in iron red mud, as desiliconization agent, advantage is as follows:Al in red mud2O3 And Na2O is good fluxing agent, helps to reduce the fusing point and viscosity of slag system, is conducive to slag sluicing system, improves desiliconization dynamics Condition reduces the foamed slag height generated in desiliconization process, improves desilication efficiency.Na in red mud2O may be used also while desiliconization With desulfurization.Polynary slag system is smelted, fusing point is lower, avoids CaF2Use, increase furnace life, reduce pollution.
This method through the following steps that realize:
It is a kind of using iron red mud as the desiliconization of hot metal agent of matrix, it is characterised in that by following components group by mass percentage Into:Iron red mud 70%~90%, magnesium slag 10%~25%, between control desiliconization agent dual alkalinity 0.6~1.2;The high ferro Red mud ingredient:Fe2O335~55%, Al2O310~20%, Na2O 5~15%, remaining ingredient are SiO2、TiO2, CaO and miscellaneous Matter;Calcium oxide content >=55%, content of magnesia >=6% and dioxide-containing silica≤35% in the magnesium slag.
The iron red mud is the solid waste of alumina producing Bayer process, possesses higher sodium oxide molybdena and iron content, Make it have higher oxidisability and basicity;
The desiliconization of hot metal agent is through briquetting or pelletizing by levigate red mud and magnesium slag, then is made after drying.
It is a kind of using iron red mud as the application method of the silicon removal pretreatment of molten iron agent of matrix:Before blast furnace casting or when tapping a blast furnace, Dry desiliconization of hot metal agent is added to according to the addition of 20~40kg/t of molten iron per ton in hot-metal bottle, impacted using molten iron, Stirring action carries out silicon removal pretreatment of molten iron and desulfurization, red mud roll into a ball iron oxide in the block also by quickly by the carbon in molten iron and silicon also Original enters in molten iron and is recycled.Slag floats on molten iron surface after desiliconization, desulfurization, and being transported to steel-making work area desulfurization by normal operation takes off It is focused on after slag.
Compared with prior art, outstanding feature of the invention is:
The desilication reaction time is abundant.Desilication method of the present invention completes desilication reaction when being using blast furnace casting, not shadow Rhythm of production is rung, since the present big blast furnace casting time is long, the corresponding desilication reaction time is more sufficient, can reach higher Desilication efficiency;
Small investment, strong operability.The potential energy stirring trough and hot-metal bottle of molten iron impact when the present invention utilizes blast furnace casting Interior desiliconization agent completes desilication reaction, without additional investment equipment;
This can realize that iron resource in red mud and magnesium slag recycles clearly, reduce the accumulation of red mud and magnesium slag and right The pollution of environment, while reached higher desiliconization and sulphur effect, desiliconization and sulphur cost are reduced, there is good economy and society It can benefit;
Sodium oxide molybdena and aluminium oxide in red mud can be used as fluxing agent, improve desiliconization and sulphur agent burn-off rate, and slagging is fast, drop Low slag viscosity, it is suppressed that the generation of foamed slag in desiliconization process, while make full use of the high-efficiency desulfurization of the sodium oxide molybdena in red mud Performance increases desiliconization and sulphur efficiency;
1. desiliconization of the present invention/sulphur agent is free of CaF2, avoid erosions and F of the F to refractory material in Hot Metal Pretreatment Pollution to environment.
1. blast furnace while desiliconization, has certain de- S efficiency.
Specific embodiment
It is illustrated with reference to specific embodiment:
Embodiment 1
Red mud ingredient is shown in Table 1.
1 red mud ingredient (wt, %) of table
The raw material proportioning for synthesizing de-/sulphur agent is as follows:The red mud of 80wt%, the magnesium slag of 20wt%.According to preceding method to red Mud carries out agglomeration.
Desiliconization/sulphur agent ingredient is shown in Table 2
2 desiliconization of the present invention of table/sulphur agent proportion scheme (wt, %)
The desiliconization agent of blast furnace casting amount 3.5% is added in the hot-metal bottle after blast furnace iron outlet groove and steel-making work area select iron, so The hot-metal bottle equipped with desiliconization agent is formulated to blast furnace discharge yard by normal operation afterwards, molten iron, high temperature iron are packed into when blast furnace casting Water falls into the red mud agglomerate in impact stirring hot-metal bottle in hot-metal bottle, carries out quick desiliconization/sulphur.Chemistry is carried out to iron sample and slag specimen Analysis, and finishing analysis is carried out to data, it is as a result as follows:Silicone content in molten iron is less than 0.15%, desulfuration efficiency 36.11%
Desiliconization/sulphuring treatment finishes after having gone out iron to blast furnace.Hot metal composition such as table 3 shows before and after desiliconization.
Hot metal composition variation (wt, %) before and after 3 desiliconization of hot metal of table
Embodiment 2
Red mud ingredient is shown in Table 4.
4 red mud ingredient (wt, %) of table
The raw material proportioning for synthesizing de-/sulphur agent is as follows:The red mud of 88wt%, the magnesium slag of 12wt%.According to preceding method to red Mud carries out agglomeration.
Desiliconization/sulphur agent ingredient is shown in Table 5
5 desiliconization of the present invention of table/sulphur agent proportion scheme (wt, %)
The desiliconization agent of blast furnace casting amount 3.8% is added in the hot-metal bottle after blast furnace iron outlet groove and steel-making work area select iron, so The hot-metal bottle equipped with desiliconization agent is formulated to blast furnace discharge yard by normal operation afterwards, molten iron, high temperature iron are packed into when blast furnace casting Water falls into the red mud agglomerate in impact stirring hot-metal bottle in hot-metal bottle, carries out quick desiliconization/sulphur.Chemistry is carried out to iron sample and slag specimen Analysis, and finishing analysis is carried out to data, it is as a result as follows:Silicone content in molten iron is less than 0.15%, desulfuration efficiency 36.58%
Desiliconization/sulphuring treatment finishes after having gone out iron to blast furnace.Hot metal composition such as table 6 shows before and after desiliconization.
Hot metal composition variation (wt, %) before and after 6 desiliconization of hot metal of table
Embodiment 3
Red mud ingredient is shown in Table 7.
7 red mud ingredient (wt, %) of table
The raw material proportioning for synthesizing de-/sulphur agent is as follows:The red mud of 88wt%, the magnesium slag of 15wt%.According to preceding method to red Mud carries out agglomeration.
Desiliconization/sulphur agent ingredient is shown in Table 8
8 desiliconization of the present invention of table/sulphur agent proportion scheme (wt, %)
The desiliconization agent of blast furnace casting amount 4% is added in the hot-metal bottle after blast furnace iron outlet groove and steel-making work area select iron, then The hot-metal bottle equipped with desiliconization agent is formulated to blast furnace discharge yard by normal operation, molten iron, high temperature liquid iron are packed into when blast furnace casting The red mud agglomerate in impact stirring hot-metal bottle in hot-metal bottle is fallen into, carries out quick desiliconization/sulphur.Chemistry point is carried out to iron sample and slag specimen Analysis, and finishing analysis is carried out to data, it is as a result as follows:Silicone content in molten iron is less than 0.15%, desulfuration efficiency 44.18%
Desiliconization/sulphuring treatment finishes after having gone out iron to blast furnace.Hot metal composition such as table 9 shows before and after desiliconization.
Hot metal composition variation (wt, %) before and after 9 desiliconization of hot metal of table

Claims (3)

  1. It is 1. a kind of using iron red mud as the desiliconization of hot metal agent of matrix, it is characterised in that:By percentage to the quality, desiliconization of hot metal agent group Part is iron red mud 70%~90%, magnesium slag 10%~25%;Between desiliconization of hot metal agent dual alkalinity 0.6~1.2;The high ferro Red mud ingredient:Fe2O335~55%, Al2O310~20%, Na2O 5~15%, remaining ingredient are SiO2、TiO2, CaO and miscellaneous Matter;Calcium oxide content >=55%, content of magnesia >=6% and dioxide-containing silica≤35% in the magnesium slag.
  2. It is 2. according to claim 1 using iron red mud as the desiliconization of hot metal agent of matrix, it is characterised in that:The desiliconization of hot metal Agent is through briquetting or pelletizing by levigate red mud and magnesium slag, then is made after drying.
  3. It is 3. a kind of according to claim 1 or 2 using iron red mud as the application method of the desiliconization of hot metal agent of matrix, feature It is:Before blast furnace casting or when tapping a blast furnace, dry desiliconization of hot metal agent is added according to the addition of 20~40kg/t of molten iron per ton Into hot-metal bottle.
CN201611142386.5A 2016-12-13 2016-12-13 A kind of desiliconization of hot metal agent and its application method using iron red mud as matrix Pending CN108220521A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110343803A (en) * 2019-07-31 2019-10-18 西安建筑科技大学 A kind of magnesium reduction slag is applied to the smelting process of pneumatic steelmaking

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1690228A (en) * 2004-04-20 2005-11-02 武汉科技大学 Preprocessing agent for molten iron and method for preparing same
CN101914651A (en) * 2010-08-19 2010-12-15 遵化市励拓环保科技有限公司 Converter or electric furnace steel-making slagging agent and preparation process thereof
CN102776310A (en) * 2011-05-09 2012-11-14 中国科学院过程工程研究所 Pretreating dephosphorizing agent for molten iron containing metallic magnesium residues
CN103952515A (en) * 2014-04-29 2014-07-30 北京科技大学 Method for recycling high-iron red mud as steelmaking slag former/dephosphorizing agent
CN105238902A (en) * 2015-10-16 2016-01-13 山东钢铁股份有限公司 Hot metal pretreatment desilicication/dephosphorization agent and application method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1690228A (en) * 2004-04-20 2005-11-02 武汉科技大学 Preprocessing agent for molten iron and method for preparing same
CN101914651A (en) * 2010-08-19 2010-12-15 遵化市励拓环保科技有限公司 Converter or electric furnace steel-making slagging agent and preparation process thereof
CN102776310A (en) * 2011-05-09 2012-11-14 中国科学院过程工程研究所 Pretreating dephosphorizing agent for molten iron containing metallic magnesium residues
CN103952515A (en) * 2014-04-29 2014-07-30 北京科技大学 Method for recycling high-iron red mud as steelmaking slag former/dephosphorizing agent
CN105238902A (en) * 2015-10-16 2016-01-13 山东钢铁股份有限公司 Hot metal pretreatment desilicication/dephosphorization agent and application method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110343803A (en) * 2019-07-31 2019-10-18 西安建筑科技大学 A kind of magnesium reduction slag is applied to the smelting process of pneumatic steelmaking
CN110343803B (en) * 2019-07-31 2020-12-11 西安建筑科技大学 Smelting method for applying magnesium reducing slag to converter steelmaking

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Application publication date: 20180629