CN104388631A - Liquid iron calcium series desulfurized slag accreting agent and preparation method thereof - Google Patents
Liquid iron calcium series desulfurized slag accreting agent and preparation method thereof Download PDFInfo
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- CN104388631A CN104388631A CN201410696713.6A CN201410696713A CN104388631A CN 104388631 A CN104388631 A CN 104388631A CN 201410696713 A CN201410696713 A CN 201410696713A CN 104388631 A CN104388631 A CN 104388631A
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- desulfurization
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Abstract
The invention belongs to the technical field of smelting of steel and iron, and particularly relates to a liquid iron calcium series desulfurized slag accreting agent and a preparation method thereof. The liquid iron calcium series desulfurized slag accreting agent disclosed by the invention can solve the technical problems that desulfurized slags are dilute in state, which leads to hard separation of slags and iron and hard removal of the desulfurized slags when an existing liquid iron pretreatment technique adopts a main process in which desulfurization is firstly performed and then vanadium extraction is performed, and the liquid iron calcium series desulfurized slag accreting agent has the effects of accreting slags and promoting separation of the slags and the iron. The liquid iron calcium series desulfurized slag accreting agent is prepared from raw materials comprising the following components in percentage by weight: 70-75 percent of active lime, 8-13 percent of sodium carbonate, 12-18 percent of fluorite and the balance of unavoidable impurities. The invention also provides a preparation method of the liquid iron calcium series desulfurized slag accreting agent, and the preparation method comprises the steps of batching of raw materials, stirring, mixing and packaging. Before liquid iron desulfurized slags are discharged, the desulfurized slag accreting agent can be added for changing the state of the desulfurized slags, promoting aggregation and sedimentation of iron balls in the desulfurized slags, reducing loss of iron, providing convenience for discharging the slags and reducing sulfur reflux.
Description
Technical field
The invention belongs to field of iron and steel smelting, be specifically related to the desulfurization of a kind of molten iron calcium system and gather slag agent and preparation method thereof.
Background technology
Calcium oxide (CaO) is the slag forming constituents of very high-quality, has good residue adjustment, desulfidation, and based on this characteristic of calcium oxide, inventor has devised a kind of is that the calcium system desulfurization of main component gathers slag agent and tests with calcium oxide.First will ensure slag sluicing system successful, reduce the titanaugite content brought in blast furnace slag, calcium oxide can carry out calcification processing to titanaugite, reduces its activity, reduces disadvantageous effect, promote slag sluicing system; In desulfurization slag, high-melting-point composition is more in addition, and desulfurization slag fusing point is higher, therefore adds part CaF
2, can fusing point be reduced, improve desulfurization slag mobility, be beneficial to and realize slag sluicing system.And add part Na
2cO
3can not only to flux shoddye, also can promote the sweetening effectiveness of sulfur removal technology.
At present, there is not yet with quickened lime is the relevant report of main component as poly-slag agent, more sees the relevant report being mixed with poly-slag agent with quickened lime, soda ash, fluorite.
Summary of the invention
Technical problem solved by the invention is to provide the polymerization and sedimentation that can promote iron shot in desulfurization slag, reduces iron loss, is convenient to skim, and reduces back sulphur and the molten iron calcium system desulfurization optimizing Desulphuring Process of Molten Iron gathers slag agent and preparation method thereof.
Molten iron calcium system of the present invention desulfurization gathers slag agent, and raw material is made up of the component of following weight per-cent: quickened lime 70 ~ 75%, soda ash 58 ~ 13%, fluorite 12 ~ 18%, and all the other are inevitable impurity; Wherein, described quickened lime is by weight containing CaO>=85.0%; Described soda ash is by weight containing Na
2cO
3>=98.0%; Described fluorite is by weight containing CaF
2>=78.0%.
In technique scheme, the molten iron calcium system desulfurization of granularity≤1mm gathers slag agent and is more than or equal to 90%.
In technique scheme, the desulfurization of molten iron calcium system gathers slag agent water content≤1.5% by weight.
Gathering granularity and the water content of slag agent in order to control the desulfurization of molten iron calcium system, selecting the material content of granularity≤1mm in raw material appropriate to the occasion control raw material quickened lime, soda ash, fluorite to be all more than or equal to 90%, three kinds of feed moisture content sums are suitable≤and 1.5%.Above-mentioned raw materials controls to avoid because raw material is defective, causes reprocessing after the production, controls granularity and water content that the desulfurization of molten iron calcium system gathers slag agent, increase processing cost.
Molten iron calcium system of the present invention desulfurization gathers the preparation method of slag agent.The method comprises the steps:
A, take quickened lime, soda ash, fluorite by weight percentage;
B, to stir, obtain the desulfurization of molten iron calcium system and gather slag agent.
In technique scheme, in step b, the desulfurization of gained molten iron calcium system gathers slag agent water content≤1.5% by weight
In technique scheme, in step b, described churning time is 5 ~ 8min.
In technique scheme, in step b, when adding raw material, can first mix fluorite and soda ash, after stirring certain hour, add quickened lime again.Concrete, after fluorite, soda ash mix and blend time 2-3min, then add quickened lime stirring, stir 3-5min, controlling total churning time is 5 ~ 8min.
In technique scheme, in step b, the molten iron calcium system desulfurization of granularity≤1mm gathers slag agent and is more than or equal to 90%.
What molten iron calcium system of the present invention desulfurization gathered that slag agent can efficiently solve that difficulty of skimming that desulfurizing iron pretreatment technology main flow occurs causes returns the phenomenon that sulphur is serious, iron loss is higher, namely before desulfurizing iron pulls out slag, add this desulfurization gather slag agent and can change desulfurization slag slag state, promote polymerization and the sedimentation of iron shot in desulfurization slag, reduce iron loss, be convenient to skim, reduce back sulphur.
Embodiment
Molten iron calcium system of the present invention desulfurization gathers slag agent, and its raw material is made up of the component of following weight per-cent: quickened lime 70 ~ 75%, soda ash 8 ~ 13%, fluorite 12 ~ 18%, and all the other are inevitable impurity; Wherein, described quickened lime is by weight containing CaO>=85.0%; Described soda ash is by weight containing Na
2cO
3>=98.0%; Described fluorite is by weight containing CaF
2>=78.0%.
During concrete enforcement, the preparation method that the desulfurization of molten iron calcium system gathers slag agent adopts following steps to prepare:
A, on request to often criticizing quickened lime, soda ash, fluorite test; The quickened lime be up to the standards, soda ash, fluorite are winched to each raw material feed bin, inputs each proportioning raw materials at automatic batching system and carry out counterweight;
B, fluorite, soda ash sent in batch mixing stirrer successively by proportioning and carries out mix and blend, after mix and blend certain hour, then add quickened lime and stir; Like this, can mix, the stirring activity duration can not be caused again long, affect process rhythm;
According to contriver's actual production, fluorite, soda ash are sent in batch mixing stirrer successively by proportioning and carries out mix and blend, after mix and blend 2min, then add quickened lime stirring, total churning time controls can mix at 5 ~ 8min, and the stirring activity duration can not be caused again long.
The raw material stirred is packed by automatic packing machine packing.
The present invention prepares the desulfurization of gained molten iron calcium system and gathers slag agent and meet following physical and chemical index:
The desulfurization of table 1 calcium system gathers slag agent physical and chemical index
The present invention gathers slag agent in raw-material selection, adopts quickened lime to provide CaO, adopts soda ash to provide Na
2o, adopts fluorite to reduce slag state fusing point and improves its mobility.
Quickened lime itself has the features such as void content is low, crystal grain is tiny, reaction area is large, alkalize, require CaO >=85.0%, the quickened lime of grade≤1mm controls more than 90%, moisture≤1.5%, to ensure that it is active, make its to add after molten iron rapidly with other compound dissolution slagging, add 2 seconds just basic scorification afterwards, more effectively can make blast furnace slag calcification, reduce titanaugite content, form uhligite, reduce titanaugite active, promote slag sluicing system.Same CaO can react with sulphur and sulfurous gas, the CaSO that final generation is stable
4.Play good sweetening effectiveness.
In molten iron, add appropriate soda ash, have another name called hot metal pretreatment technology, it can play the effect of desulfurization, dephosphorization, containing the molten iron of the valuable element such as vanadium and niobium after soda ash process, these elements can be made to be transferred to slag phase.Because of process after soda ash slag had water-soluble, be conducive to the hydrometallurgic recovery of these elements and soda ash itself.Require that soda ash is containing Na
2cO
3the soda ash of>=98.0%, grade≤1mm controls more than 90%, moisture≤1.5%, to ensure that it plays maximum effect in molten iron.
CaF
2itself does not have sweetening power, but adds CaF in CaO
2after, the desulfurization rate of CaO is significantly increased, and therefore in sweetening process, Chang Zuowei promotor uses, and the fluorite of employing is by weight containing CaF
2>=78.0%; The CaF of grade≤1mm
2control more than 90%, moisture≤1.5%, to ensure that it plays maximum effect in molten iron.
Below in conjunction with embodiment, the invention will be further described, but therefore do not limit the present invention among described scope of embodiments.
The quickened lime adopted in embodiment, soda ash and fluorite physical and chemical index detection case are in table 2:
Table 2 test starting material assay
The technical indicator of three kinds of raw materials in embodiment: granularity≤1mm requires to be more than or equal to 90%; Quickened lime is by weight containing CaO>=85.0%; Soda ash is by weight containing Na
2cO
3>=98.0%; Fluorite is by weight containing CaF
2>=78.0%; Employing commercially available prod, water content summation≤1.5% of three kinds of activeconstituentss.
Embodiment 1
By the fluorite of 16 weight parts be up to the standards, the soda ash of 9 weight parts is sent in HN-500 type batch mixing stirrer and is carried out mix and blend, after mix and blend 2min, the quickened lime of 75 weight parts is sent in HN-500 type batch mixing stirrer again and carry out mix and blend, after mix and blend 3min, the material of mixing is sent into automatic quantitative packing machine pack, waterproof sealing, be packaged into the loose shape product of 25Kg/ bag, then put in dry jumbo bag packing bag, mark warehouse-in is for subsequent use, sampling detects the physical and chemical index (detected result is in table 3) that the desulfurization of calcium system gathers slag agent, detect qualified after be transported to desulfurization vanadium extraction working district again and use.Molten iron pulls out slag and crosses Cheng Qian and use the desulfurization of the present embodiment molten iron calcium system to gather slag agent to gather residue material as desulfurization, the data that have collected 15 stove molten iron draw: add-on is 1.5 ~ 1.6kg/ ton steel, average 1.55kg/ ton steel, calculate test heat desulfurization steel technology average out to 1051.26kg/t, contrast does not add the desulfurization of calcium system and gathers slag agent 1061.85/t, and desulfurization steel technology reduces 10.59kg/t; To return sulfur content be dephosphorization efficiency average out to 0.008% to test heat, and it is 0.010% that contrast heat returns sulfur content, therefore tests heat and on average return sulphur and comparatively contrast heat and return sulphur and reduce 0.002%; Desulfurization slag iron content average out to 63%, contrast heat 75%, comparatively contrasts heat and pulls out slag band iron minimizing 12%.
The desulfurization of table 3 embodiment 1 molten iron calcium system gathers slag agent Physico-chemical tests index
| Project | CaO，％ | Na2O，％ | CaF2，％ | S，％ | H 2O，％ | Granularity, 0-1mm% |
| Embodiment 1 product | 65.4 | 8.87 | 12.74 | 0.024 | 1.5 | 92 |
Embodiment 2
By the fluorite of 15 weight parts be up to the standards, the soda ash of 13 weight parts is sent in HN-500 type batch mixing stirrer and is carried out mix and blend, after mix and blend 2min, the quickened lime of 72 weight parts is sent in HN-500 type batch mixing stirrer again and carry out mix and blend, after mix and blend 3min, the material of mixing is sent into automatic quantitative packing machine pack, waterproof sealing, be packaged into the loose shape product of 25Kg/ bag, then put in dry jumbo bag packing bag, mark warehouse-in is for subsequent use, sampling detects the physical and chemical index (detected result is in table 4) that the desulfurization of calcium system gathers slag agent, detect qualified after be transported to desulfurization vanadium extraction working district again and use.Molten iron pulls out slag and crosses Cheng Qian and use the desulfurization of the present embodiment molten iron calcium system to gather slag agent to gather residue material as desulfurization, the data that have collected 15 stove molten iron draw: add-on is 1.4 ~ 1.7kg/ ton steel, average 1.55kg/ ton steel, calculate test heat desulfurization steel technology average out to 1048.62kg/t, contrast does not add the desulfurization of calcium system and gathers slag agent 1058.64kg/t, and desulfurization steel technology reduces 10.02kg/t; To return sulfur content be dephosphorization efficiency average out to 0.009% to test heat, and it is 0.011% that contrast heat returns sulfur content, therefore tests heat and on average return sulphur and comparatively contrast heat and return sulphur and reduce 0.002%; Desulfurization slag iron content average out to 62%, contrast heat 73%, comparatively contrasts heat and pulls out slag band iron minimizing 11%.
The desulfurization of table 4 embodiment 2 molten iron calcium system gathers slag agent Physico-chemical tests index
| Project | CaO，％ | Na2O，％ | CaF2，％ | S，％ | H 2O，％ | Granularity, 0-1mm% |
| Embodiment 2 product | 62.78 | 12.81 | 11.94 | 0.023 | 1.5 | 93 |
Content according to background technology of the present invention and embodiment 1,2 can draw: molten iron calcium system of the present invention desulfurization gathers slag agent and applies in molten iron and can change desulfurization slag slag state, promote polymerization and the sedimentation of iron shot in desulfurization slag, reduce iron loss, be convenient to skim, reduce back sulphur, have a extensive future.
Claims (10)
1. the desulfurization of molten iron calcium system gathers slag agent, it is characterized in that: raw material is made up of the component of following weight per-cent: quickened lime 70 ~ 75%, soda ash 8 ~ 13%, fluorite 12 ~ 18%, and all the other are inevitable impurity;
Wherein, described quickened lime is by weight containing CaO>=85.0%; Described soda ash is by weight containing Na
2cO
3>=98.0%; Described fluorite is by weight containing CaF
2>=78.0%.
2. molten iron calcium system according to claim 1 desulfurization gathers slag agent, it is characterized in that: the molten iron calcium system desulfurization of granularity≤1mm gathers slag agent and is more than or equal to 90%.
3. molten iron calcium system according to claim 1 desulfurization gathers slag agent, it is characterized in that: the desulfurization of described molten iron calcium system gathers slag agent water content≤1.5% by weight.
4. molten iron calcium system according to claim 1 desulfurization gathers slag agent, it is characterized in that: in described raw material quickened lime, soda ash, fluorite, the material content of granularity≤1mm is all more than or equal to 90%; Three kinds of feed moisture content sums are suitable≤and 1.5%.
5. the molten iron calcium system desulfurization described in any one of Claims 1 to 4 gathers the preparation method of slag agent, it is characterized in that: comprise the steps:
A, take quickened lime, soda ash, fluorite by weight percentage;
B, to stir, obtain the desulfurization of molten iron calcium system and gather slag agent.
6. molten iron calcium system according to claim 5 desulfurization gathers the preparation method of slag agent, and it is characterized in that: in step a, in described raw material quickened lime, soda ash, fluorite, the material content of granularity≤1mm is all more than or equal to 90%; Three kinds of feed moisture content sums are suitable≤and 1.5%.
7. molten iron calcium system according to claim 5 desulfurization gathers the preparation method of slag agent, it is characterized in that: in step b, and the desulfurization of gained molten iron calcium system gathers slag agent water content≤1.5% by weight.
8. molten iron calcium system according to claim 5 desulfurization gathers the preparation method of slag agent, and it is characterized in that: in step b, described churning time is 5 ~ 8min.
9. molten iron calcium system according to claim 8 desulfurization gathers the preparation method of slag agent, it is characterized in that: in step b, after fluorite, soda ash mix and blend time 2-3min, then add quickened lime stirring, stir 3-5min, controlling total churning time is 5 ~ 8min.
10. molten iron calcium system according to claim 5 desulfurization gathers the preparation method of slag agent, it is characterized in that: in step b, and the molten iron calcium system desulfurization of gained granularity≤1mm gathers slag agent and is more than or equal to 90%.
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| CN107099636A (en) * | 2016-02-22 | 2017-08-29 | 宝山钢铁股份有限公司 | A kind of efficient composite desulfurizer and its preparation method and application |
| CN108441596A (en) * | 2018-05-14 | 2018-08-24 | 韩波 | Aluminium electroloysis is two-mand ladle the middle desulfurizing agent and sulfur method used |
| CN114250334A (en) * | 2021-12-07 | 2022-03-29 | 湖南华菱涟源钢铁有限公司 | Desulfurization slag modifier and molten iron desulfurization method |
| CN114875194A (en) * | 2022-04-25 | 2022-08-09 | 武汉钢铁有限公司 | Molten iron lime-based KR high-efficiency desulfurizing agent and preparation method thereof |
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Application publication date: 20150304 |