CN105238902A - Hot metal pretreatment desilicication/dephosphorization agent and application method thereof - Google Patents
Hot metal pretreatment desilicication/dephosphorization agent and application method thereof Download PDFInfo
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- CN105238902A CN105238902A CN201510676813.7A CN201510676813A CN105238902A CN 105238902 A CN105238902 A CN 105238902A CN 201510676813 A CN201510676813 A CN 201510676813A CN 105238902 A CN105238902 A CN 105238902A
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- dephosphorizing agent
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Abstract
The invention discloses a hot metal pretreatment desilicication/dephosphorization agent. The hot metal pretreatment desilicication/dephosphorization agent is formed by mixing ferric red mud and lime particles according to the mass ratio of 1:(0.2-0.3). The content of TFe in the ferric red mud is 40-50 wt%, and the particle size of the ferric red mud is 0.088-0.5 mm. The particle size of the desilicication/dephosphorization agent is smaller than or equal to 3 mm, and the content of the desilicication/dephosphorization agent with the particle size of 1-3 mm is smaller than or equal to 5 wt%. The invention further discloses an application method of the hot metal pretreatment desilicication/dephosphorization agent. The method comprises the following steps that whether desilicication operation and dephosphorization operation are carried out independently or at the same time is determined according to the steelmaking smelting steel ball requirements and hot metal in-station conditions. When the ferric red mud is used as the desilicication/dephosphorization agent for hot metal pretreatment, furnace slag foaming can be avoided, furnace slag is prevented from overflowing out of a hot metal furnace, and the desilicication and dephosphorization effect is good.
Description
Technical field
The present invention relates to a kind of silicon removal pretreatment of molten iron/dephosphorizing agent and using method thereof, belong to ferrous metallurgical industry technical field of hot metal pretreatment.
Background technology
In ferrous metallurgical industry, hot metal pre process procedures mainly provides for steel making working procedure the molten iron that stable components, phosphorus sulphur content are as far as possible low, to facilitate the operation of steel-making to control, improves steel-making economy, therefore concentrates on desiliconization of hot metal, dephosphorization and desulfurization three aspects.The method taked mainly contains powder injection process, KR paddling process etc.
Silicon removal pretreatment of molten iron mainly utilizes the strong oxidizing property of silicon, removes by adding solid oxide iron in molten iron:
[Si]+2FeO
(s)=(SiO
2)+2[Fe]
Liquid iron pretreatment dephosphorizing mainly utilizes oxygenant to make [P] in molten iron be oxidized to (P
2o
5), then make it to be combined with the basic oxide slag former added, become the phosphoric acid salt of stable existence in slag.
General requirement for silicon removal pretreatment of molten iron, dephosphorization is: low temperature, certain oxidisability and basicity, and current silicon removal pretreatment of molten iron/dephosphorizing agent mainly utilizes sintering breeze, iron phosphorus etc. to be master containing the material of ferric oxide.But because total oxygen content such as sintering breeze, iron phosphorus etc. is higher, causes and add rear reaction acutely, slag foaming is serious, very easily overflows in the reaction vessels such as iron ladle, and causes all kinds of industrial accident, therefore do not obtain sufficient utilization and extention.
The contaminative waste residue of discharging when red mud is Aluminium industry extraction aluminum oxide, generally often produces 1.0 tons of aluminum oxide, incidentally produces 1.0-2.0 ton red mud.The element contained in red mud is more, mainly based on the oxide compound of iron, aluminium, sodium etc.There is more difficulty in the innoxious use for red mud, large-area stockyard can only be relied on to stack, occupy a large amount of soil always, also causes serious pollution to the soil, water resources etc. of surrounding.Therefore, development and utilization red mud to greatest extent, becomes the importance of China's aluminum oxide industry health environment-friendly development.
At present, rarely has report red mud being applied to hot metal pre process procedures as desiliconization or dephosphorization, sweetening agent, Chinese patent " a kind of hot metal pretreatment agent and preparation method thereof " (200410013065.6) discloses a kind of hot metal pretreatment agent, the red mud wherein containing 15-30%.But in the composition of the hot metal pretreatment agent composition of this patent, CaO/SiO
2all more than 3.0, object is the hot metal pretreatment agent of making high alkalinity, to realize taking into account desiliconization of hot metal, desulfurization and dephosphorization, but so pretreating agent of high alkalinity, do not need in desiliconization process, and cause desiliconization cinder viscosity large, very easily cause slag to foam serious, overflow reaction vessel, cause production and safety accident; Secondly, the pretreating agent of high alkalinity like this, in preprocessing process, slag melting difficulty, desulfurization and dephosphorization efficiency can not ensure.Utilize red mud not make the purification processes of ferro element, need extra and Fe
2o
3mixing, with all iron content improving pretreating agent, to ensure the oxidation capacity of pretreating agent, adds cost.And this patent utilizes comparatively small amt to red mud, only account for the 15-30% of this hot metal pretreatment agent proportioning.In addition, the production method of this patent needs red mud and Fe
2o
3, CaO, NaCO
3, MnO
2, CaCl
2, SiO
2or other Using Metallurgical Solid Wastes containing these compositions carry out mix grinding, furnish type is many, and processing compound is complicated.
Summary of the invention
For above-mentioned prior art, the object of this invention is to provide a kind of silicon removal pretreatment of molten iron/dephosphorizing agent and using method thereof.
For achieving the above object, the present invention adopts following technical proposals:
A kind of silicon removal pretreatment of molten iron/dephosphorizing agent is 1:(0.2-0.3 by iron red mud and lime particle in mass ratio) mix; TFe content in described iron red mud is 40-50wt%, and the granularity of iron red mud is 0.088-0.5mm.
Granularity≤the 3mm of described desiliconization/dephosphorizing agent, wherein, granularity is the content≤5wt% (namely granularity is that the content of the desiliconization/dephosphorizing agent of 1-3mm is no more than 5% of desiliconization/dephosphorizing agent total mass) of the desiliconization/dephosphorizing agent of 1-3mm.Adopt iron red mud and the lime particle of this granularity, can avoid the abrasive dust operation using agglomerate, iron scale etc. required, use of can directly dusting, also can add use by stirring, and the use-pattern of desiliconization/dephosphorizing agent is more diversified.And after mixing with lime particle proportioning, granularity is little, the specific surface area of participating in reaction is large, is conducive to improving slagging speed.But also transport and the material loading of desiliconization/dephosphorizing agent can be facilitated.
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 purify, namely obtains the iron red mud of TFe content 40-50wt%.
Concrete, the main component of iron red mud of the present invention comprises: TFe:40-50wt%, T.O:12-18wt%, Al
2o
3: 7-15wt%, Na
2o:4-8wt%, SiO
2: 3-8wt%, MgO:0.5-2wt%;
In described iron red mud, P≤0.040wt%.
Wherein, " TFe " refers to all iron content; " T.O " refers to oxygen level in the oxide compound of iron.
The preparation method of silicon removal pretreatment of molten iron/dephosphorizing agent of the present invention is: iron red mud and lime particle are mixed according to a conventional method, to obtain final product.
Present invention also offers the using method of this silicon removal pretreatment of molten iron/dephosphorizing agent, step is as follows:
Determine to carry out desiliconization operation separately according to steel-making smelting steel grade demand and the molten iron condition of entering the station, dephosphorization operation or two kinds of operations are all carried out;
If [Si] >=0.40% in molten iron, then carry out desiliconization operation, according to target desiliconization amount, in molten iron, add desiliconization/dephosphorizing 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 carry out dephosphorization operation, if [Si]≤0.15% in molten iron, then directly carry out dephosphorization operation; If [Si] > 0.15%, then first carry out desiliconization operation in molten iron, silicone content in molten iron is reduced to less than 0.15%, then according to target phosphorus control overflow, adds desiliconization/dephosphorizing agent and carry out dephosphorization operation.
When carrying out desiliconization operation, the pass between the add-on of desiliconization/dephosphorizing agent and target desiliconization amount is:
Y
1＝131.2X
1；
In formula, Y
1represent the add-on (kg/t) of desiliconization/dephosphorizing agent, X
1represent target desiliconization amount (X
1%).
When carrying out dephosphorization operation, the pass between the add-on of desiliconization/dephosphorizing agent and target dephosphorization amount is:
Y
2＝124.5X
2+1.5；
In formula, Y
2represent the add-on (kg/t) of desiliconization/dephosphorizing agent, X
2represent target dephosphorization amount (X
2%).
Preferably, when carrying out desiliconization operation, after adding desiliconization/dephosphorizing agent, carry out stir process, the stir process time is 20-25min; Be specially: first moderate-speed mixer 10-15min, guarantee desiliconization/dephosphorizing agent to stir in molten iron, prevent desiliconization slag from bubbling; High-speed stirring 5-10min again, guarantees sufficient reacting.
Preferably, the molten iron condition of entering the station should control be: hot metal ladle Clearance requirement is greater than 500mm.
Molten iron temperature: 1350 DEG C≤T≤1450 DEG C.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 controls as 200-300kg/min.
In the present invention, [Si] represents the content of silicon, wt%.
Beneficial effect of the present invention:
(1) iron red mud used in silicon removal pretreatment of molten iron/dephosphorizing agent of the present invention, compare full iron such as sintering breeze and iron scale etc. and total oxygen content low, oxidisability is weaker, and desiliconization process wants slow with the carbon reaction in molten iron, and therefore slag not easily foams.
(2) Al containing about 7-15% in the iron red mud used in silicon removal pretreatment of molten iron/dephosphorizing agent of the present invention
2o
3, can reduce cinder viscosity, this is also conducive to reducing slag foam performance.And, Al
2o
3or good fusing assistant, is conducive to promoting slag melting in lower temperature, rapid slagging.The dynamic conditions of dephosphorization can be improved.Avoid the use of fluorite.
(3) Na containing about 4-8% in the iron red mud used in silicon removal pretreatment of molten iron/dephosphorizing agent of the present invention
2o, it is as strong basicity oxide compound, combines more tight, can improve the desulfurization of slag, dephosphorizing capacity with the silicon in molten iron and phosphorous oxides.
(4) the iron red mud granularity used in silicon removal pretreatment of molten iron/dephosphorizing agent of the present invention is 0.088-0.5mm, avoids the abrasive dust operation using agglomerate, iron scale etc. required, use of can directly dusting.And after mixing with lime powder face proportioning, granularity is little, the specific surface area of participating in reaction is large, is conducive to improving slagging speed.
(5) in desiliconization/dephosphorizing agent of the present invention, CaO/SiO
2all below 3.0, can be good at taking into account desiliconization and dephosphorization demand, desiliconization cinder viscosity is little, avoids occurring that slag foaming is serious, overflows reaction vessel, causes the generation of production and safety accident.
(6) when carrying out desiliconization or dephosphorization operation, the add-on of desiliconization/dephosphorizing agent directly affects the effect of desiliconization or dephosphorization, and add-on is too much, then can increase and remove cost, add-on is very few, then can cause desiliconization or dephosphorization effect undesirable; The add-on of the present invention to desiliconization/dephosphorizing agent be optimized, and overall equilbrium removes the relation between cost and removal effect.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, should be noted that following explanation is only to explain the present invention, not limiting its content.
Embodiment 1: the preparation of desiliconization/dephosphorizing agent
Select certain aluminium manufacturer's Bayer process domestic to produce the red mud obtained, obtain iron red mud after carrying out magnetic separation purify to ferro element wherein, the main component in iron red mud is as shown in table 1:
Main component in table 1 iron red mud
| Composition | TFe | T.O | Al 2O 3 | Na 2O | SiO 2 | MgO | P |
| wt％ | 43.87 | 14.6 | 9.87 | 4.29 | 6.31 | 0.78 | 0.029 |
After iron red mud drying, same lime particle (granularity≤3mm) is that 1:0.25 evenly mixes according to mass ratio, make desiliconization/dephosphorizing agent, require the overall particle size≤3mm of desiliconization/dephosphorizing agent, wherein, granularity is the content≤5wt% of the desiliconization/dephosphorizing agent of 1-3mm, to facilitate transport and the material loading of desiliconization/dephosphorizing agent.Transported by groove tank car.
Embodiment 2: the use of desiliconization/dephosphorizing agent
Determine to carry out desiliconization operation separately according to steel-making smelting steel grade demand and the molten iron condition of entering the station, dephosphorization operation is still carried out two kinds of operations and is all carried out.
If molten iron [Si] >=0.40%, then carry out desiliconization operation, according to target desiliconization amount, in molten iron, add desiliconization/dephosphorizing agent, the pass between the add-on of desiliconization/dephosphorizing agent and target desiliconization amount is:
Y
1＝131.2X
1；
In formula, Y
1represent the add-on (kg/t) of desiliconization/dephosphorizing agent, X
1represent target desiliconization amount (X
1%).
Choose several target desiliconization amounts, molten iron silicon, in table 2, is reduced to less than 0.40% by the add-on of desiliconization/dephosphorizing agent.
Desiliconization/dephosphorizing agent add-on during table 2 desiliconization operation
Low phosphorus steel by smelting kind ([P]≤0.010%) and/or ultra-low phosphoretic steel kind ([P]≤0.005%), need carry out dephosphorization operation, if [Si]≤0.15% in molten iron, then directly carry out dephosphorization operation; If [Si] > 0.15%, then first carry out desiliconization operation in molten iron, silicone content in molten iron is reduced to less than 0.15%, then according to target phosphorus control overflow, adds desiliconization/dephosphorizing agent and carry out dephosphorization operation.Pass between the add-on of desiliconization/dephosphorizing agent and target dephosphorization amount is:
Y
2＝124.5X
2+1.5；
In formula, Y
2represent the add-on (kg/t) of desiliconization/dephosphorizing agent, X
2represent target dephosphorization amount (X
2%).
Choose several target dephosphorization amounts, the add-on of desiliconization/dephosphorizing agent in table 3,
Desiliconization/dephosphorizing agent add-on during the operation of table 3 dephosphorization
Supporting use equipment:
Desiliconization/dephosphorizing agent prepared by the present invention, due to based on powder face, is therefore mainly suitable for use in KR paddling process and powder injection process hot metal pretreatment equipment.
The present embodiment is for KR whipping device in hot metal pretreatment, and desiliconization/dephosphorizing agent operation code is as follows:
1, operational condition
Hot metal ladle Clearance requirement is greater than 500mm.
Molten iron temperature requires: 1350 DEG C≤T≤1450 DEG C.Process molten iron temperature is less than 1250 DEG C, stops desiliconization, dephosphorization operation.
The molten iron band quantity of slag requires≤0.8%.
Blanking velocity control overflow 200-300kg/min.
Skim, desulfurization, the equipment such as reinforced is normal.
2, operating process
(1) enter the station molten iron [Si] >=0.40%, carries out desiliconization operation, molten iron silicon is dropped to less than 0.40%.
(2) low phosphorus steel by smelting kind ([P]≤0.010%) and ultra-low phosphoretic steel kind ([P]≤0.005%), need carry out dephosphorization operation.
0.15% < [Si]≤0.4%: enter the station-skim-desiliconization-skim-dephosphorization-skim.
[Si]≤0.15%: enter the station-skim-dephosphorization-skim.
3, operation scheme
(1) desiliconization operation
Early stage skims bare area about 50%.Skimming is the blast furnace slag taking molten iron surface off, this slag SiO
2content is higher, and basicity is on the low side, carries out desiliconization operation again after therefore needing to remove, the convenient basicity improving desiliconization slag, is conducive to improving desilication efficiency.Deeply skim mainly due to after desiliconization before dephosphorization, desilication product SiO
2substantially all enter in slag, dephosphorization needs the slag making more than 2.0 basicity, SiO
2during content height, basicity of slag is unable to lift, so need deeply to skim.
Desiliconizing and dephosphorizing agent add-on adds Standard entertion according to during the agent desiliconization of table 1 desiliconizing and dephosphorizing.
Alr mode: treatment time 25min, molten iron silicon is greater than 0.30%, treatment time proper extension.
Moderate-speed mixer: 15min, adds in molten iron by desiliconizing and dephosphorizing agent, guarantees material to stir in molten iron, prevents desiliconization slag from bubbling.
High-speed stirring: 10min, fully stirs and stirs in molten iron by desiliconizing and dephosphorizing agent mixing, guarantee sufficient reacting.
(2) dephosphorization operation
Skim before dephosphorization and must deeply skim, molten iron bare area requires to be greater than more than 80%.
Desiliconizing and dephosphorizing agent add-on adds Standard entertion according to during table 2 desiliconizing and dephosphorizing agent dephosphorization.
Alr mode: treatment time 20-25min;
Moderate-speed mixer: 15min, adds in molten iron by desiliconizing and dephosphorizing agent, guarantees material to stir in molten iron, prevents desiliconization slag from bubbling.
High-speed stirring: 10min, fully stirs and stirs in molten iron by desiliconizing and dephosphorizing agent mixing, guarantee sufficient reacting.
Desiliconization/dephosphorizing agent containing iron red mud provided by the invention is through production test, and in molten iron, silicone content can drop to mass percent less than 0.15%, dephosphorization rate >=60%.
Claims (10)
1. silicon removal pretreatment of molten iron/dephosphorizing agent, is characterized in that, is 1:(0.2-0.3 in mass ratio by iron red mud and lime particle) mix; TFe content in described iron red mud is 40-50wt%, and the granularity of iron red mud is 0.088-0.5mm.
2. silicon removal pretreatment of molten iron/dephosphorizing agent as claimed in claim 1, it is characterized in that, the granularity≤3mm of described desiliconization/dephosphorizing agent, wherein, granularity is the content≤5wt% of the desiliconization/dephosphorizing agent of 1-3mm.
3. silicon removal pretreatment of molten iron/dephosphorizing agent as claimed in claim 1, it is characterized in that, the preparation method of described iron red mud is: by the ferro element in the solid waste of alumina producing Bayer process after magnetic separation purify, namely obtains the iron red mud of TFe content 40-50wt%.
4. silicon removal pretreatment of molten iron/dephosphorizing agent as claimed in claim 1, it is characterized in that, the composition of described iron red mud comprises: TFe:40-50wt%, T.O:12-18wt%, Al
2o
3: 7-15wt%, Na
2o:4-8wt%, SiO
2: 3-8wt%, MgO:0.5-2wt%.
5. silicon removal pretreatment of molten iron/dephosphorizing agent as claimed in claim 4, is characterized in that, in described iron red mud, and P≤0.040wt%.
6. the using method of the silicon removal pretreatment of molten iron/dephosphorizing agent described in any one of claim 1 to 5, it is characterized in that, step is as follows:
Determine to carry out desiliconization operation separately according to steel-making smelting steel grade demand and the molten iron condition of entering the station, dephosphorization operation or two kinds of operations are all carried out;
If [Si] >=0.40% in molten iron, then carry out desiliconization operation, according to target desiliconization amount, in molten iron, add silicon removal pretreatment of molten iron/dephosphorizing agent, the silicone content in molten iron is reduced to less than 0.40%;
Low phosphorus steel by smelting kind and/or ultra-low phosphoretic steel kind, need carry out dephosphorization operation, if [Si]≤0.15% in molten iron, then directly carries out dephosphorization operation; If [Si] > 0.15%, then first carry out desiliconization operation in molten iron, silicone content in molten iron is reduced to less than 0.15%, then according to target phosphorus control overflow, adds silicon removal pretreatment of molten iron/dephosphorizing agent and carry out dephosphorization operation.
7. method as claimed in claim 6, is characterized in that, when carrying out desiliconization operation, the pass between the add-on of desiliconization/dephosphorizing agent and target desiliconization amount is:
Y
1＝131.2X
1；
In formula, Y
1represent the add-on of desiliconization/dephosphorizing agent, kg/t; X
1represent target desiliconization amount, %.
8. method as claimed in claim 6, is characterized in that, when carrying out dephosphorization operation, the pass between the add-on of desiliconization/dephosphorizing agent and target dephosphorization amount is:
Y
2＝124.5X
2+1.5；
In formula, Y
2represent the add-on of desiliconization/dephosphorizing agent, kg/t; X
2represent target dephosphorization amount, %.
9. method as claimed in claim 6, is characterized in that, when carrying out desiliconization operation, after adding desiliconization/dephosphorizing agent, carry out stir process, the stir process time is 20-25min.
10. method as claimed in claim 9, it is characterized in that, the concrete operations of described stir process are: first moderate-speed mixer 10-15min, guarantee desiliconization/dephosphorizing agent to stir in molten iron, prevent desiliconization slag from bubbling; High-speed stirring 5-10min again.
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|---|---|---|---|
| CN201510676813.7A CN105238902B (en) | 2015-10-16 | 2015-10-16 | A kind of silicon removal pretreatment of molten iron/Dephosphorising agent and its application method |
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|---|---|---|---|
| CN201510676813.7A CN105238902B (en) | 2015-10-16 | 2015-10-16 | A kind of silicon removal pretreatment of molten iron/Dephosphorising agent and its application method |
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| CN105238902B CN105238902B (en) | 2018-02-23 |
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ID=55036720
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108220521A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconizing agent taking high-iron red mud as matrix and using method thereof |
| CN108220529A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconization agent using sintering machine head electric dedusting ash as base body |
| CN110982989A (en) * | 2020-01-17 | 2020-04-10 | 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 |
| CN113832297A (en) * | 2021-10-19 | 2021-12-24 | 北京科技大学 | Red mud-based composite calcium ferrite and preparation method and application thereof |
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| 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 |
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| SU779395A1 (en) * | 1978-03-07 | 1980-11-15 | Карагандинский металлургический комбинат | Method of steel smelting in oxygen convertor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220521A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconizing agent taking high-iron red mud as matrix and using method thereof |
| CN108220529A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconization agent using sintering machine head electric dedusting ash as base body |
| 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 |
| CN110982989A (en) * | 2020-01-17 | 2020-04-10 | 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 |
| CN113832297A (en) * | 2021-10-19 | 2021-12-24 | 北京科技大学 | Red mud-based composite calcium ferrite and preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| CN105238902B (en) | 2018-02-23 |
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