CN105238902B - A kind of silicon removal pretreatment of molten iron/Dephosphorising agent and its application method - Google Patents
A kind of silicon removal pretreatment of molten iron/Dephosphorising agent and its application method Download PDFInfo
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- CN105238902B CN105238902B CN201510676813.7A CN201510676813A CN105238902B CN 105238902 B CN105238902 B CN 105238902B CN 201510676813 A CN201510676813 A CN 201510676813A CN 105238902 B CN105238902 B CN 105238902B
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Abstract
The invention discloses a kind of silicon removal pretreatment of molten iron/Dephosphorising agent, is 1 in mass ratio by iron red mud and lime particle：(0.2 0.3) mix；TFe contents in the iron red mud are 40 50wt%, and the granularity of iron red mud is 0.088 0.5mm.Granularity≤3mm of desiliconization/Dephosphorising agent, wherein, granularity is content≤5wt% of 1 3mm desiliconization/Dephosphorising agent.The invention also discloses the application method of the silicon removal pretreatment of molten iron/Dephosphorising agent, step are as follows：According to steel-making smelt steel grade demand and molten iron enter the station condition determine be it is independent carry out desiliconization operation, dephosphorization operation or two kinds of operations are carried out.The iron red mud of the present invention can avoid clinker from foaming, prevent clinker from being overflowed from molten iron furnace when carrying out molten iron pretreatment as desiliconization/Dephosphorising agent, and desiliconization, the effect of dephosphorization are good.
Description
Technical field
The present invention relates to a kind of silicon removal pretreatment of molten iron/Dephosphorising agent and its application method, belong to ferrous metallurgical industry molten iron
Preconditioning technique field.
Background technology
In ferrous metallurgical industry, hot metal pre process procedures mainly provide stable components for steel making working procedure, phosphorus sulfur content is use up
Low molten iron is measured, to facilitate the operational control of steel-making, improves steel-making economy, therefore concentrate on desiliconization of hot metal, dephosphorization and desulfurization
Three aspects.The method taken mainly has powder injection process, KR paddling process etc..
Silicon removal pretreatment of molten iron is mainly the strong oxidizing property using silicon, is taken off by adding solid oxide iron into molten iron
Remove:
[Si]+2FeO(s)=(SiO2)+2[Fe]
Liquid iron pretreatment dephosphorizing mainly makes [P] in molten iron to be oxidized to (P using oxidant2O5), then be allowed to and addition
Basic anhydride slag former combines, and turns into the phosphate being stabilized in slag.
General requirement for silicon removal pretreatment of molten iron, dephosphorization is：Low temperature, certain oxidisability and basicity, at present molten iron
Pretreatment desiliconization/Dephosphorising agent is mainly using sintering based on the materials containing iron oxide such as miberal powder, iron phosphorus.But due to sintering miberal powder, iron
The total oxygen contents such as phosphorus are higher, cause to react violent after adding, clinker foaming is serious, overflows easily out of reaction vessels such as hot-metal bottles
Go out, and cause all kinds of production accidents, therefore do not obtain sufficient utilization and extention.
The contaminative waste residue that red mud is discharged when being aluminium industry extraction aluminum oxide, typically often produces 1.0 tons of aluminum oxide, subsidiary
Produce 1.0-2.0 ton red muds.The element contained in red mud is more, mainly based on the oxide of iron, aluminium, sodium etc..For red mud
Innoxious use more difficulty always be present, can only rely on large area stockyard stack, a large amount of soils are occupied, also to week
The soil that encloses, water resource etc. cause serious pollution.Therefore, red mud is developed and utilized to greatest extent, turns into China's oxidation
The importance of aluminium industry health environment-friendly development.
At present, rarely has the report for being applied to hot metal pre process procedures using red mud as desiliconization or dephosphorization, desulfurizing agent, China is specially
Sharp " a kind of molten iron pretreating agent and preparation method thereof " (200410013065.6) disclose a kind of molten iron pretreating agent, wherein containing
There is 15-30% red mud.But in the composition of the molten iron pretreating agent mixture of the patent, CaO/SiO2More than 3.0, purpose
It is the molten iron pretreating agent for making high alkalinity, desiliconization of hot metal, desulfurization and dephosphorization is taken into account to realize, but so pretreatment of high alkalinity
Agent, in desiliconization process and do not need, and cause desiliconization cinder viscosity big, easily cause clinker foaming serious, overflow reaction appearance
Device, cause production and safety accident；Secondly, the pretreating agent of such high alkalinity, in preprocessing process, slag melting difficulty,
Desulfurization and dephosphorization efficiency do not ensure that.Do not make the purification processes of ferro element using red mud, it is necessary to additionally and Fe2O3Mixing with
The all iron content of pretreating agent is improved, to ensure the oxidability of pretreating agent, adds cost.And the patent is to the profit of red mud
With negligible amounts, the 15-30% that the molten iron pretreating agent matches only is accounted for.In addition, the production method of the patent need by red mud with
Fe2O3、CaO、NaCO3、MnO2、CaCl2、SiO2Or other Metallurgical Solid Wastes containing these compositions carry out mix grinding, dispensing species
More, processing compound is complicated.
The content of the invention
For above-mentioned prior art, it is an object of the invention to provide a kind of silicon removal pretreatment of molten iron/Dephosphorising agent and its use
Method.
To achieve the above object, the present invention uses following technical proposals：
A kind of silicon removal pretreatment of molten iron/Dephosphorising agent, it is 1 in mass ratio by iron red mud and lime particle：(0.2-0.3) is mixed
Conjunction forms；TFe contents in the iron red mud are 40-50wt%, and the granularity of iron red mud is 0.088-0.5mm.
Granularity≤3mm of the desiliconization/Dephosphorising agent, wherein, granularity is content≤5wt% of 1-3mm desiliconization/Dephosphorising agent
(i.e. granularity is that the content of 1-3mm desiliconization/Dephosphorising agent is no more than the 5% of desiliconization/Dephosphorising agent gross mass).Using the height of the granularity
Iron red mud and lime particle, the milling process needed for using sintering deposit, iron scale etc. can be avoided, can directly dust makes
With can also be used by stirring to add, the occupation mode of desiliconization/Dephosphorising agent is more diversified.It is and mixed with lime particle proportioning
With it is rear, granularity is small, and it is big to participate in the specific surface area of reaction, is advantageous to improve slagging speed.But also desiliconization/Dephosphorising agent can be facilitated
Transport and feeding.
The preparation method of iron red mud of the present invention is：By the ferro element in the solid waste of alumina producing Bayer process
After magnetic separation purification enrichment, that is, obtain TFe contents 40-50wt% iron red mud.
Specifically, the main component of the iron red mud of the present invention includes：TFe：40-50wt%, T.O：12-18wt%,
Al2O3：7-15wt%, Na2O：4-8wt%, SiO2:3-8wt%, MgO：0.5-2wt%；
In the iron red mud, P≤0.040wt%.
Wherein, " TFe " refers to all iron content；" T.O " refers to oxygen content in the oxide of iron.
The preparation method of silicon removal pretreatment of molten iron/Dephosphorising agent of the present invention is：By iron red mud and lime particle routinely
Method mixes, and produces.
Present invention also offers the application method of the silicon removal pretreatment of molten iron/Dephosphorising agent, step are as follows：
According to steel-making smelt steel grade demand and molten iron enter the station condition determine be it is independent carry out desiliconization operation, dephosphorization operation is also
It is that two kinds of operations are carried out；
If [Si] >=0.40% in molten iron, carry out desiliconization operation, according to target desiliconization amount, added into molten iron desiliconization/
Dephosphorising agent, the silicone content in molten iron is reduced to less than 0.40%；
Low phosphorus steel by smelting kind ([P]≤0.010%) and/or ultra-low phosphoretic steel kind ([P]≤0.005%), need to carry out dephosphorization behaviour
Make, if [Si]≤0.15% in molten iron, directly carry out dephosphorization operation；If [Si] ＞ 0.15%, first carries out desiliconization in molten iron
Operation, less than 0.15% is reduced to by silicone content in molten iron, is controlled and is required further according to target phosphorus, is added desiliconization/Dephosphorising agent and is carried out
Dephosphorization operates.
When carrying out desiliconization operation, the relation between the addition and target desiliconization amount of desiliconization/Dephosphorising agent is：
Y1=131.2X1；
In formula, Y1Represent the addition (kg/t) of desiliconization/Dephosphorising agent, X1Represent target desiliconization amount (X1%).
When carrying out dephosphorization operation, the relation between the addition and target dephosphorization amount of desiliconization/Dephosphorising agent is：
Y2=124.5X2+1.5；
In formula, Y2Represent the addition (kg/t) of desiliconization/Dephosphorising agent, X2Represent target dephosphorization amount (X2%).
Preferably, when carrying out desiliconization operation, after adding desiliconization/Dephosphorising agent, it is stirred, the stir process time is
20-25min；Specially：First moderate-speed mixer 10-15min, it is ensured that desiliconization/Dephosphorising agent is stirred into molten iron, prevents desiliconization slag from rising
Bubble；High-speed stirred 5-10min again, it is ensured that reaction is abundant.
Preferably, the molten iron condition of entering the station, which should control, is：Ladle Clearance requirement is more than 500mm.
Molten iron temperature:1350℃≤T≤1450℃.Process molten iron temperature is less than 1250 DEG C, stops desiliconization, dephosphorization operation.
The molten iron band quantity of slag≤0.8%.
Blanking velocity control is 200-300kg/min.
In the present invention, [Si] represents the content of silicon, wt%.
Beneficial effects of the present invention：
(1) iron red mud used in silicon removal pretreatment of molten iron/Dephosphorising agent of the invention, compared to sintering miberal powder and oxidation
The full iron such as iron sheet and total oxygen content are low, and oxidisability is weaker, and desiliconization process is slow with the carbon reaction in molten iron, therefore clinker
It is not easy to foam.
(2) contain 7-15%'s or so in the iron red mud used in silicon removal pretreatment of molten iron/Dephosphorising agent of the invention
Al2O3, cinder viscosity can be reduced, this is also beneficial to reduce clinker foam performance.Moreover, Al2O3Or good fluxing agent,
Be advantageous to promote slag melting, rapid slagging in relatively low temperature.The dynamic conditions of dephosphorization can be improved.Avoid fluorite
Use.
(3) contain 4-8%'s or so in the iron red mud used in silicon removal pretreatment of molten iron/Dephosphorising agent of the invention
Na2O, it is more close with the silicon in molten iron and phosphorous oxides combination as strong basicity oxide, it is possible to increase clinker takes off
Sulphur, dephosphorizing capacity.
(4) the iron red mud granularity used in silicon removal pretreatment of molten iron/Dephosphorising agent of the invention is 0.088-0.5mm,
Avoid using the milling process required for sintering deposit, iron scale etc., can directly dust use.And matched with lime powder
After mixing, granularity is small, and it is big to participate in the specific surface area of reaction, is advantageous to improve slagging speed.
(5) in desiliconization/Dephosphorising agent of the invention, CaO/SiO2Below 3.0, it can be good at taking into account desiliconization and dephosphorization
Demand, desiliconization cinder viscosity is small, avoids the occurrence of clinker foaming seriously, overflows reaction vessel, causes the hair of production and safety accident
It is raw.
(6) when carrying out desiliconization or dephosphorization operates, the addition of desiliconization/Dephosphorising agent directly affects the effect of desiliconization or dephosphorization
Fruit, addition is excessive, then can increase removing cost, and addition is very few, then desiliconization or dephosphorization effect can be caused undesirable；The present invention
The addition of desiliconization/Dephosphorising agent is optimized, the relation between overall balance removing cost and removal effect.
Embodiment
With reference to embodiment, the present invention is further illustrated, it should which explanation, the description below is merely to solution
The present invention is released, its content is not defined.
Embodiment 1：The preparation of desiliconization/Dephosphorising agent
From the red mud obtained by certain domestic aluminium manufacturer's Bayer process production, after ferro element therein progress magnetic separation purification enrichment
Obtain iron red mud, the main component in iron red mud is as shown in table 1：
Main component in the iron red mud of table 1
| Composition | TFe | T.O | Al2O3 | Na2O | SiO2 | MgO | P |
| Wt% | 43.87 | 14.6 | 9.87 | 4.29 | 6.31 | 0.78 | 0.029 |
After iron red mud is dried, same to lime particle (granularity≤3mm) is 1 according to mass ratio：0.25 is uniformly mixed,
Desiliconization/Dephosphorising agent is made, it is desirable to overall particle size≤3mm of desiliconization/Dephosphorising agent, wherein, granularity is 1-3mm desiliconization/Dephosphorising agent
Content≤5wt%, to facilitate the transport of desiliconization/Dephosphorising agent and feeding.Transported by groove tank car.
Embodiment 2：The use of desiliconization/Dephosphorising agent
According to steel-making smelt steel grade demand and molten iron enter the station condition determine be it is independent carry out desiliconization operation, dephosphorization operation is also
It is to carry out two kinds of operations to carry out.
If molten iron [Si] >=0.40%, desiliconization operation is carried out, according to target desiliconization amount, desiliconization/de- is added into molten iron
Phosphorus agent, the relation between the addition and target desiliconization amount of desiliconization/Dephosphorising agent are：
Y1=131.2X1；
In formula, Y1Represent the addition (kg/t) of desiliconization/Dephosphorising agent, X1Represent target desiliconization amount (X1%).
Choose several target desiliconization amounts, the addition of desiliconization/Dephosphorising agent is shown in Table 2, by molten iron silicon be reduced to 0.40% with
Under.
Desiliconization/Dephosphorising agent addition when the desiliconization of table 2 operates
Low phosphorus steel by smelting kind ([P]≤0.010%) and/or ultra-low phosphoretic steel kind ([P]≤0.005%), need to carry out dephosphorization behaviour
Make, if [Si]≤0.15% in molten iron, directly carry out dephosphorization operation；If [Si] ＞ 0.15%, first carries out desiliconization in molten iron
Operation, less than 0.15% is reduced to by silicone content in molten iron, is controlled and is required further according to target phosphorus, is added desiliconization/Dephosphorising agent and is carried out
Dephosphorization operates.Relation between the addition and target dephosphorization amount of desiliconization/Dephosphorising agent is：
Y2=124.5X2+1.5；
In formula, Y2Represent the addition (kg/t) of desiliconization/Dephosphorising agent, X2Represent target dephosphorization amount (X2%).
Several target dephosphorization amounts are chosen, the addition of desiliconization/Dephosphorising agent is shown in Table 3,
Desiliconization/Dephosphorising agent addition when the dephosphorization of table 3 operates
Supporting use equipment：
Desiliconization/Dephosphorising agent prepared by the present invention is mainly suitable for being used in KR paddling process and dusted due to based on powder
Method molten iron pre-processing device.
For the present embodiment by taking KR mixing plants during molten iron pre-processes as an example, desiliconization/Dephosphorising agent is as follows using technological procedure：
1st, operating condition
Ladle Clearance requirement is more than 500mm.
Molten iron temperature requirement:1350℃≤T≤1450℃.Process molten iron temperature is less than 1250 DEG C, stops desiliconization, dephosphorization behaviour
Make.
Molten iron band quantity of slag requirement≤0.8%.
Blanking velocity control requires 200-300kg/min.
Skim, desulfurization, the equipment such as charging it is normal.
2nd, operating process
(1) enter the station molten iron [Si] >=0.40%, carries out desiliconization operation, molten iron silicon is dropped into less than 0.40%.
(2) low phosphorus steel by smelting kind ([P]≤0.010%) and ultra-low phosphoretic steel kind ([P]≤0.005%), need to carry out dephosphorization behaviour
Make.
0.15% ＜ [Si]≤0.4%：Enter the station-skim-desiliconization-skim-dephosphorization-skim.
[Si]≤0.15%：Enter the station-skim-dephosphorization-skim.
3rd, operation scheme
(1) desiliconization operates
Bare area skim early stage 50% or so.It is the blast furnace slag for taking molten iron surface off to skim, clinker SiO2Contain
Amount is higher, and basicity is relatively low, it is therefore desirable to carries out desiliconization operation after removing again, the convenient basicity for improving desiliconization slag, is advantageous to improve
Desilication efficiency.Depth before dephosphorization is skimmed mainly due to after desiliconization, desilication product SiO2Substantially all enter in clinker, dephosphorization needs
Make the clinker of more than 2.0 basicity, SiO2When content is high, basicity of slag is unable to lift, so needing deep skim.
Standard entertion is added when desiliconizing and dephosphorizing agent addition is according to 1 desiliconizing and dephosphorizing agent desiliconization of table.
Agitating mode：Processing time 25min, molten iron silicon are more than 0.30%, processing time proper extension.
Moderate-speed mixer:15min, desiliconizing and dephosphorizing agent is added in molten iron, it is ensured that material is stirred into molten iron, prevents desiliconization slag from rising
Bubble.
High-speed stirred：10min, it is sufficiently stirred and stirs into desiliconizing and dephosphorizing agent mixing in molten iron, it is ensured that reaction is abundant.
(2) dephosphorization operates
Skimmed before dephosphorization to skim deeply, and the requirement of molten iron bare area is more than more than 80%.
Standard entertion is added when desiliconizing and dephosphorizing agent addition is according to 2 desiliconizing and dephosphorizing agent dephosphorization of table.
Agitating mode：Processing time 20-25min；
Moderate-speed mixer:15min, desiliconizing and dephosphorizing agent is added in molten iron, it is ensured that material is stirred into molten iron, prevents desiliconization slag from rising
Bubble.
High-speed stirred：10min, it is sufficiently stirred and stirs into desiliconizing and dephosphorizing agent mixing in molten iron, it is ensured that reaction is abundant.
Desiliconization/Dephosphorising agent provided by the invention containing iron red mud passes through pilot production, and silicone content can drop in molten iron
Below mass percent 0.15%, dephosphorization rate >=60%.
Claims (3)
- A kind of 1. application method of silicon removal pretreatment of molten iron/Dephosphorising agent, it is characterised in that described silicon removal pretreatment of molten iron/de- Phosphorus agent, it is 1 in mass ratio by iron red mud and lime particle：(0.2-0.3) is mixed；TFe in the iron red mud contains Measure as 40-50wt%, the granularity of iron red mud is 0.088-0.5mm, and the preparation method of the iron red mud is：Bayer process is given birth to The ferro element in the solid waste of aluminum oxide is produced after magnetic separation purification enrichment, that is, the high ferro for obtaining TFe contents 40-50wt% is red Mud, granularity≤3mm of the desiliconization/Dephosphorising agent, wherein, granularity is content≤5wt% of 1-3mm desiliconization/Dephosphorising agent；The silicon removal pretreatment of molten iron/dephosphorization operating procedure is as follows：Steel grade demand and molten iron are smelted according to steel-making to enter the station condition It is determined that being independent progress desiliconization operation, dephosphorization operation or two kinds of operations are carried out；If [Si] >=0.40% in molten iron, desiliconization operation is carried out, according to target desiliconization amount, molten iron pretreatment is added into molten iron Desiliconization/Dephosphorising agent, is stirred, and the stir process time is 20-25min, first moderate-speed mixer 10-15min, it is ensured that will be de- Silicon/Dephosphorising agent is stirred into molten iron, prevents desiliconization slag from bubbling；High-speed stirred 5-10min again, the silicone content in molten iron is reduced to Less than 0.40%, the relation between the addition and target desiliconization amount of desiliconization/Dephosphorising agent is：Y1=131.2X1；In formula, Y1 is represented The addition of desiliconization/Dephosphorising agent, kg/t；X1 represents target desiliconization amount, %；Low phosphorus steel by smelting kind and/or ultra-low phosphoretic steel kind, dephosphorization operation need to be carried out, if the operation order of [Si]≤0.15% in molten iron： Enter the station-skim-dephosphorization-skim；If 0.15% ＜ [Si]≤0.4% operation order in molten iron：Enter the station-skim-desiliconization- Skim-dephosphorization-skim, first carry out desiliconization operation, silicone content in molten iron is reduced to less than 0.15%, further according to target phosphorus control System requires, adds silicon removal pretreatment of molten iron/Dephosphorising agent and carries out dephosphorization operation；The addition of desiliconization/Dephosphorising agent and target dephosphorization amount Between relation be：Y2=124.5X2+1.5；In formula, Y2Represent the addition of desiliconization/Dephosphorising agent, kg/t；X2Target is represented to take off Phosphorus amount, %.
- 2. the application method of silicon removal pretreatment of molten iron/Dephosphorising agent as claimed in claim 1, it is characterised in that the high ferro is red The composition of mud includes：TFe：40-50wt%, T.O：12-18wt%, Al2O3：7-15wt%, Na2O：4-8wt%, SiO2:3- 8wt%, MgO：0.5-2wt%.
- 3. the application method of silicon removal pretreatment of molten iron/Dephosphorising agent as claimed in claim 2, it is characterised in that the high ferro is red In mud, P≤0.040wt%.
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| CN108220521A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | A kind of desiliconization of hot metal agent and its application method using iron red mud as matrix |
| CN108220529A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | It is a kind of using sintering machine head end electro-precipitating dust as the desiliconization of hot metal agent of matrix |
| CN107447071A (en) * | 2017-06-20 | 2017-12-08 | 中国铝业股份有限公司 | One kind contains Na2O semi-steel making slag former and preparation method thereof |
| CN110982989B (en) * | 2020-01-17 | 2021-06-25 | 河南科技大学 | Preparation method and use method of slag condenser for molten iron pretreatment |
| CN113061685A (en) * | 2021-03-05 | 2021-07-02 | 广西方元达环保工程有限公司 | Method for efficiently utilizing red mud |
| CN113832297B (en) * | 2021-10-19 | 2022-06-17 | 北京科技大学 | Red mud-based composite calcium ferrite and preparation method and application thereof |
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| CN103725825A (en) * | 2014-01-24 | 2014-04-16 | 安徽工业大学 | Aluminum industrial red mud-based dephosphorizing agent for converter steelmaking and preparation method thereof |
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