CN103627850B - Hot metal containing V-Ti desulphurization slag modifier and preparation method thereof and desulfurization Slag modification method - Google Patents
Hot metal containing V-Ti desulphurization slag modifier and preparation method thereof and desulfurization Slag modification method Download PDFInfo
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Abstract
The invention provides a kind of hot metal containing V-Ti desulphurization slag modifier and preparation method thereof and desulfurization Slag modification method.Described preparation method comprises: by by weight 30 ~ 40 parts quartz sand powder, the Fluorspar Powder of 5 ~ 10 parts, the light ash of 5 ~ 10 parts, the active lime powder of 30 ~ 40 parts and 10 ~ 20 parts aluminum oxide powder mix, obtain desulphurization slag modifier.The composition of described desulphurization slag modifier comprises by weight percentage: be not more than the S of 0.080%, is not more than the P of 0.080%, the SiO of 30% ~ 40%
2, the CaF of 4% ~ 8%
2, the Na of 4% ~ 9%
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3.Described desulfurization Slag modification method comprises and adds in hot metal containing V-Ti by desulphurization slag modifier as above, carries out tune desulfurization slag to hot metal containing V-Ti.Beneficial effect of the present invention comprises: can improve hot metal containing V-Ti desulfuration efficiency; Sulfur return amount after desulfurization of molten iron can be reduced; Iron loss of skimming can be reduced.
Description
Technical field
The present invention relates to Desulphurization of Pig Iron field, more particularly, relate to a kind of hot metal containing V-Ti desulphurization slag modifier and preparation method thereof, and this desulphurization slag modifier of a kind of application carries out the method for desulfurization residue adjustment to hot metal containing V-Ti.
Background technology
Usually, for adopt containing sefstromite as raw material iron and steel enterprise for, can hot metal containing V-Ti be produced containing sefstromite (such as, vanadium titano-magnetite) after blast furnace ironmaking.When carrying out desulfurization process to hot metal containing V-Ti, following situation can be there is: because blast furnace slag that hot metal containing V-Ti is with is containing V-Ti blast-furnace slag, blast furnace slag fusing point is higher, mobility is poor, cause desulfurizing iron process kinetics condition poor, and then cause the desulfuration efficiency of sweetening process not give full play to, after desulfurization, desulfurization slag is thicker, slag sluicing system difficulty, iron loss of skimming is higher.
In the prior art, application number is that the patent application document of CN201210320261 discloses a kind of pre-molten molten iron slag supplying agent reducing desulphurised hot metal slag melting point, its composition by weight percent is: lime 5 ~ 15%, quartz sand 50 ~ 60%, soda ash 10 ~ 20%, fluorite 10 ~ 20%, binding agent, additional 4 ~ 8%.Pre-molten molten iron slag supplying agent of the present invention belongs to Na
2o-SiO
2slag system, has fusing point lower than molten iron, and the effect of fusing, shoddye, can slow down molten iron handbag wall dry slag, avoid the sordid problem of bag wall molten iron because slagging scorification causes rapidly.
Application number is that the patent application document of CN200910311841 discloses a kind of desulfurization slag regulator for refining steel and preparation method thereof, and the desulfurization slag regulator for refining of this application is prepared from by the raw material of following weight proportioning: steel-making dedusting ash, the alumina based material of 10 ~ 15%, the lime powder of 5 ~ 10% of 80 ~ 85%; Wherein, described alumina based material is containing Al
2o
3more than 60%.This desulfurization slag regulator for refining be used for iron and steel smelting after desulfurizing iron pre-treatment, the desulfurization slag formed carry out adjustment process, with reduce desulfurization slag temperature of fusion, reduction slag viscosity, improve slag mobility; Thoroughly can solve steel-making high calcium dedusting ash discharge pollution on the environment, achieve the recycling of resource; Simultaneously because dedusting ash cost is low, therefore the adjusting agent that uses lower than current each steel mill of product cost, has dissemination.
But above-mentioned slag supplying agent is difficult to be applicable to hot metal containing V-Ti.
Summary of the invention
An object of the present invention is to solve at least one item in above-mentioned prior art problem.
Such as, an object of the present invention is that providing a kind of is suitable for desulphurization slag modifier of hot metal containing V-Ti being carried out to desulfurization residue adjustment process and preparation method thereof.
An aspect of of the present present invention provides a kind of preparation method of hot metal containing V-Ti desulphurization slag modifier.Described preparation method comprises the following steps: by by weight 30 ~ 40 parts quartz sand powder, the Fluorspar Powder of 5 ~ 10 parts, the light ash of 5 ~ 10 parts, the active lime powder of 30 ~ 40 parts and 10 ~ 20 parts aluminum oxide powder mix, obtain hot metal containing V-Ti desulphurization slag modifier.
Another aspect provides a kind of hot metal containing V-Ti desulphurization slag modifier.The composition of described desulphurization slag modifier comprises by weight percentage: be not more than the S of 0.080%, is not more than the P of 0.080%, the SiO of 30% ~ 40%
2, the CaF of 4% ~ 8%
2, the Na of 4% ~ 9%
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3.
Another aspect of the present invention provides a kind of desulfurization Slag modification method of hot metal containing V-Ti.Described desulfurization Slag modification method comprises and adds in hot metal containing V-Ti by desulphurization slag modifier as above, carries out desulfurization residue adjustment to hot metal containing V-Ti.
Compared with prior art, beneficial effect of the present invention comprises: can improve hot metal containing V-Ti desulfuration efficiency; Sulfur return amount after desulfurization of molten iron can be reduced; Iron loss of skimming can be reduced.
Embodiment
Hereinafter, will hot metal containing V-Ti desulphurization slag modifier of the present invention and preparation method thereof be described in conjunction with exemplary embodiment in detail and apply this desulphurization slag modifier to carry out desulfurization residue adjustment method to hot metal containing V-Ti.In the present invention, hot metal containing V-Ti is the molten iron obtained after blast-furnace smelting containing sefstromite (such as, sefstromite concentrate).In the present invention, as without contrary explanation, then percentage composition all refers to weight percent.
The preparation method of hot metal containing V-Ti desulphurization slag modifier according to an aspect of the present invention comprises the following steps: respectively by weight 30 ~ 40 parts quartz sand, the fluorite of 5 ~ 10 parts, the soda ash of 5 ~ 10 parts, the quickened lime of 30 ~ 40 parts and 10 ~ 20 parts aluminum oxide (such as, aluminium ash, aluminum oxide powder etc.) grind powdered, mix, obtain hot metal containing V-Ti desulphurization slag modifier.That is, hot metal containing V-Ti desulphurization slag modifier can by by weight 30 ~ 40 parts quartz sand powder, the Fluorspar Powder of 5 ~ 10 parts, the light ash of 5 ~ 10 parts, the active lime powder of 30 ~ 40 parts and 10 ~ 20 parts aluminum oxide powder Homogeneous phase mixing form.Preferred proportioning can be the aluminum oxide powder of the quartz sand powder of 32 ~ 38 parts, the Fluorspar Powder of 6 ~ 9 parts, the light ash of 6 ~ 9 parts, the active lime powder of 32 ~ 38 parts and 12 ~ 17 parts.Further, the particle diameter of quartz sand powder, Fluorspar Powder, light ash, active lime powder and aluminum oxide powder is preferably not more than 3mm, can obtain sweetening effectiveness better like this.
For the vanadium-bearing hot metal that blast-furnace smelting obtains, in desulphurization slag modifier of the present invention, each composition is associated with each other, and acting in conjunction is to play good desulfurization residue adjustment effect.Wherein, quartz sand mainly in order to make slag system change the higher silicate slag system of fusing point into, making slag system present when molten iron temperature about 1300 DEG C solid-state, reaching the effect of good slag sluicing system, is conducive to minimizing and skims band iron; If the quartz sand amount of allocating into is less than 30 parts, then the effect generating high-melting-point slag system is poor; If the quartz sand amount of allocating into is greater than 40 parts, then desulfurization slag slag state is thicker, and slag sluicing system effect is poor.The Main Function of fluorite is the viscosity regulating desulfurization slag, is conducive to improving desulfuration efficiency and is conducive to desulphurization and slag skimming operation; When the fluorite amount of allocating into is less than 5 parts, desulfurization slag is still thicker, poor fluidity, slag sluicing system weak effect; When the fluorite amount of allocating into is greater than 10 parts, desulfurization slag is rarer, comparatively serious to iron ladle refractory corrosion, is unfavorable for desulphurization and slag skimming simultaneously.The effect of light ash is, reduces desulfurization slag viscosity, reduces desulphurization and slag skimming iron loss further and controls back sulphur; If when the amount of allocating into of light ash is too low, slag system viscosity reduction effect is not obvious; If when the amount of allocating into of light ash is excessive, slag state will be caused rarer, be unfavorable for that slag sluicing system and reduction are skimmed iron loss and control back sulphur.The Main Function of quickened lime is to carry out calcification processing to vanadium-bearing hot metal surface blast furnace slag, the basicity of iron ladle surface slag system before raising desulfurization, make slag system change the lower slag system of fusing point into simultaneously, be conducive to giving full play to and improving the captured sulfur result of slag system of later stage desulfuration efficiency; When the quickened lime amount of allocating into is less than 30 parts, improves slag system basicity and reduce the DeGrain of slag system fusing point; When the quickened lime amount of allocating into is greater than 40 parts, molten iron surface slag system basicity is too high, makes desulfuration efficiency decrease on the contrary.The Main Function of aluminum oxide powder be with quartz sand with the use of, make slag system change dystectic aluminosilicate slag system into, be conducive to slag sluicing system and desulphurization and slag skimming; Excessive or the too small slag system that all can make of the aluminum oxide powder amount of allocating into changes the effect deteriorate of aluminosilicate into.
The composition of the desulphurization slag modifier obtained through aforesaid method can comprise by weight percentage: be not more than the S of 0.080%, be not more than the P of 0.080%, the SiO of 30% ~ 40%
2, the CaF of 4% ~ 8%
2, the Na of 4% ~ 9%
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3.Preferably, the composition of desulphurization slag modifier comprises by weight percentage: the S of 0.010% ~ 0.050%, the P of 0.010% ~ 0.050%, 33% ~ 37% SiO
2, 5% ~ 7% CaF
2, 6% ~ 8% Na
2cO
3, the CaO of 33% ~ the 37% and Al of 10 ~ 15%
2o
3.
The composition of hot metal containing V-Ti desulphurization slag modifier according to a further aspect of the invention comprises by weight percentage: be not more than the S of 0.080%, is not more than the P of 0.080%, the SiO of 30% ~ 40%
2, the CaF of 4% ~ 8%
2, the Na of 4% ~ 9%
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3.Such as, the composition of hot metal containing V-Ti desulphurization slag modifier by weight percentage can by be not more than 0.080% S, be not more than the P of 0.080%, the SiO of 30% ~ 40%
2, 4% ~ 8% CaF
2, 4% ~ 9% Na
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3composition.Preferably, the particle diameter of desulphurization slag modifier is not more than 3mm.
The desulfurization Slag modification method of hot metal containing V-Ti according to another aspect of the invention comprises and adds in hot metal containing V-Ti by desulphurization slag modifier as above, carries out desulfurization residue adjustment to hot metal containing V-Ti.The add-on of desulphurization slag modifier specifically can be determined according to the sulphur content in hot metal containing V-Ti.Such as, the sulphur content in vanadium-bearing hot metal is 0.030% ~ 0.20% by weight percentage, the add-on of desulphurization slag modifier can be 3kg/tFe ~ 5kg/tFe, is preferably 3.5kg/tFe ~ 4.5kg/tFe.After desulfurization Slag modification method of the present invention process, desulfurization process can be carried out subsequently, thus obtain good sweetening effectiveness.Such as, the method for desulfurization process can adopt and spray into sweetening agent to realize.Sweetening agent can for conventional passivated magnesium, compound calcium-based desulfurizing agent, compound Mg-base desulfurizing agent etc.Such as, inactivating magnesium desulfurizing agent can be the magnesium powder of containing metal more than magnesium 88wt%.
Desulphurization slag modifier of the present invention is adopted to carry out desulfurization residue adjustment process to hot metal containing V-Ti, good desulfurization residue adjustment effect can be played, its effect comprise can: improve basicity of slag before desulfurization, make to change comparatively low melting point slag system into containing V-Ti blast-furnace slag, improve desulfurization kinetics condition, improve desulfuration efficiency, make desulfuration efficiency reach more than 95%; Effective control controls sulfur return amount after desulfurization of molten iron, returns sulfur content≤0.003% after de-; Improve desulfurization slag slag state, improve desulfurization slag and remove rate, reduce desulphurization and slag skimming iron loss more than 0.8%; Efficiently solve the aluminum oxide ash discharge pollution on the environment problem of the enterprises such as alumina producing.
In one exemplary embodiment of the present invention, the method preparing hot metal containing V-Ti desulphurization slag modifier can realize in the following ways: with quartz sand, fluorite, soda ash, quickened lime and aluminum oxide powder for raw material, by 30% ~ 40% quartz sand, 5% ~ 10% fluorite, 5% ~ 10% soda ash, 30% ~ 40% quickened lime, 10% ~ 20% aluminum oxide powder, wear into fine powder, mix, Task-size Controlling is≤3mm.Gained slag supplying agent composition is:: S0.010% ~ 0.080%, P0.010% ~ 0.080%, SiO
230% ~ 40%, CaF
24% ~ 8%, Na
2cO
34% ~ 9%, CaO30% ~ 40%, Al
2o
38 ~ 16%.
In addition, the SiO preferably containing content>=90% in quartz sand
2, the S of content≤0.05% and P of content≤0.05%.Na preferably containing content>=90% in soda ash
2cO
3, the S of content≤0.10% and P of content≤0.10%.CaF preferably containing content>=85% in fluorite
2, the S of content≤0.10% and P of content≤0.10%.P preferably containing the CaO of content >=85%, the S of content≤0.05% and content≤0.05% in quickened lime.Al preferably containing content>=85% in aluminum oxide powder
2o
3, the S of content≤0.10% and P of content≤0.10%.
Provide the preparation method that concrete example further illustrates the hot metal containing V-Ti desulphurization slag modifier of exemplary embodiment of the present below.
Example 1
By the aluminum oxide powder of 38 parts of quartz sand by weight, 6 parts of fluorites, 8 parts of soda ash, 32 parts of quickened limes and 16 parts, wear into fine powder, mix, Task-size Controlling is≤3mm.Gained desulphurization slag modifier composition is: S0.04%, P0.06%, SiO
237.6%, CaF
25.5%, Na
2cO
38%, CaO31%, Al
2o
317.8%.
In blast furnace, smelt sefstromite concentrate obtain hot metal containing V-Ti, wherein S content is 0.083%, and temperature is 1316 DEG C.After molten iron enters desulfurization station, in this vanadium-bearing hot metal, first add the above-mentioned desulphurization slag modifier of 3.5kg/tFe, carry out stirring 20 seconds by slag rake, deactivating magnesium powder desulfurization of then jetting, the treatment time is 20min.After desulfurization terminates, carry out taking off slag operation, taking off the quantity of slag is 41kg/tFe.
After testing, in the hot metal containing V-Ti after desulfurization, S content is 0.002%, and time sulfur content after desulfurization is 0.0008%.Iron loss of skimming is 0.9%.
Example 2
By the aluminium ash of 35 parts of quartz sand by weight, 9 parts of fluorites, 6 parts of soda ash, 35 parts of quickened limes and 15 parts, wear into fine powder, mix, Task-size Controlling is≤3mm.Gained desulphurization slag modifier composition is: S0.05%, P0.05%, SiO
234.8%, CaF
28.4%, Na
2cO
35.5%, CaO34%, Al
2o
317.2%.
In blast furnace, smelt sefstromite concentrate obtain hot metal containing V-Ti, wherein S content is 0.095%, and temperature is 1308 DEG C.After molten iron enters desulfurization station, in this vanadium-bearing hot metal, first add the above-mentioned desulphurization slag modifier of 4.5kg/tFe, carry out stirring 20 seconds by slag rake, deactivating magnesium powder desulfurization of then jetting, the treatment time is 24min.After desulfurization terminates, carry out taking off slag operation, taking off the quantity of slag is 43kg/tFe.
After testing, in the hot metal containing V-Ti after desulfurization, S content is 0.002%, and time sulfur content after desulfurization is 0.001%.Iron loss of skimming is 0.8%.
In sum, the present invention can the present invention can while improving desulfurization slag slag state, raising desulfuration efficiency and desulfurization slag remove rate, desulfuration efficiency reaches more than 95% (such as, can be by sulphur content before desulfurization 0.030% ~ 0.20% hot metal containing V-Ti take off to sulphur content be 0 ~ 0.003%), return sulfur content after de-and can be controlled in≤the scope of 0.003%, desulphurization and slag skimming iron loss can reduce by more than 0.8% (such as, desulphurization and slag skimming iron loss can not higher than 1.8%).
Although describe the present invention in conjunction with exemplary embodiment above, those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, can carry out various amendment to above-described embodiment.
Claims (9)
1. a preparation method for hot metal containing V-Ti desulphurization slag modifier, is characterized in that, described preparation method comprises the following steps:
By by weight 30 ~ 40 parts quartz sand powder, the Fluorspar Powder of 5 ~ 10 parts, the light ash of 5 ~ 10 parts, the active lime powder of 30 ~ 40 parts and 10 ~ 20 parts aluminum oxide powder mix, obtain hot metal containing V-Ti desulphurization slag modifier, wherein, the composition of described desulphurization slag modifier comprises by weight percentage: be not more than the S of 0.080%, be not more than the P of 0.080%, the SiO of 30% ~ 40%
2, the CaF of 4% ~ 8%
2, the Na of 4% ~ 9%
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3.
2. the preparation method of hot metal containing V-Ti desulphurization slag modifier according to claim 1, it is characterized in that, the composition of described desulphurization slag modifier comprises by weight percentage: the S of 0.010% ~ 0.050%, the P of 0.010% ~ 0.050%, 33% ~ 37% SiO
2, 5% ~ 7% CaF
2, 6% ~ 8% Na
2cO
3, the CaO of 33% ~ the 37% and Al of 10 ~ 15%
2o
3.
3. the preparation method of hot metal containing V-Ti desulphurization slag modifier according to claim 1, it is characterized in that, described method is ground quartz sand powder, Fluorspar Powder, light ash, active lime powder and aluminum oxide powder before being also included in mixing step, is all not more than 3mm to make its particle diameter.
4. a hot metal containing V-Ti desulphurization slag modifier, is characterized in that, the composition of described desulphurization slag modifier comprises by weight percentage: be not more than the S of 0.080%, is not more than the P of 0.080%, the SiO of 30% ~ 40%
2, the CaF of 4% ~ 8%
2, the Na of 4% ~ 9%
2cO
3, the CaO of 30% ~ the 40% and Al of 8% ~ 16%
2o
3.
5. hot metal containing V-Ti desulphurization slag modifier according to claim 4, is characterized in that, the composition of described desulphurization slag modifier comprises by weight percentage: the S of 0.010% ~ 0.050%, the P of 0.010% ~ 0.050%, 33% ~ 37% SiO
2, 5% ~ 7% CaF
2, 6% ~ 8% Na
2cO
3, the CaO of 33% ~ the 37% and Al of 10 ~ 15%
2o
3.
6. hot metal containing V-Ti desulphurization slag modifier according to claim 4, is characterized in that, the particle diameter of described desulphurization slag modifier is not more than 3mm.
7. according to the desulphurization slag modifier in claim 4 to 6 described in any one, it is characterized in that, described hot metal containing V-Ti is the molten iron obtained after blast-furnace smelting containing sefstromite.
8. the desulfurization Slag modification method of a hot metal containing V-Ti, it is characterized in that, described desulfurization Slag modification method comprises the desulphurization slag modifier obtained as the preparation method in claims 1 to 3 as described in any one or adds in hot metal containing V-Ti as the desulphurization slag modifier in claim 4 to 6 as described in any one, carries out desulfurization residue adjustment to hot metal containing V-Ti.
9. the desulfurization Slag modification method of hot metal containing V-Ti according to claim 8, it is characterized in that, sulphur content in described hot metal containing V-Ti is 0.030% ~ 0.20% by weight percentage, the add-on of described desulphurization slag modifier is 3kg/tFe ~ 5kg/tFe.
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| CN104032060B (en) * | 2014-06-19 | 2016-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of desulfurizing iron |
| CN104032096B (en) * | 2014-06-19 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of desulfurization slag properties-correcting agent and desulfurizing iron |
| CN104032094B (en) * | 2014-06-19 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of desulfurization slag properties-correcting agent and desulfurizing iron |
| CN104195280A (en) * | 2014-09-16 | 2014-12-10 | 攀钢集团西昌钢钒有限公司 | Composite desulfurizer and molten iron desulphurization method employing composite desulfurizer |
| CN106282453A (en) * | 2016-08-31 | 2017-01-04 | 云南德胜钢铁有限公司 | A kind of method of sefstromite blast furnace process |
| CN108754058A (en) * | 2018-06-07 | 2018-11-06 | 上海应用技术大学 | A kind of nano-hot metal composite desulfurizing agent and preparation method thereof |
| CN110218840A (en) * | 2019-06-24 | 2019-09-10 | 鞍钢股份有限公司 | A kind of high-titanium molten iron dreg modifying agent and slag iron separation method |
| CN112481448B (en) * | 2020-12-11 | 2023-04-18 | 四川德胜集团钒钛有限公司 | Vanadium-titanium molten iron desulfurizer and preparation method thereof |
| CN112553409B (en) * | 2020-12-11 | 2023-04-14 | 四川德胜集团钒钛有限公司 | Vanadium-titanium-containing molten iron slag conglomeration agent and preparation method thereof |
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| CN101016577A (en) * | 2007-02-15 | 2007-08-15 | 沈阳东北大学冶金技术研究所有限公司 | Passivation composite desulfurization powder |
| CN102041353B (en) * | 2009-10-23 | 2012-12-05 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizer, preparation method thereof and desulfurization method adopting desulfurizer |
| CN103014217B (en) * | 2011-09-26 | 2015-07-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurizing agent and application thereof as well as molten iron krypton (KR) desulfurization method |
| CN102719589B (en) * | 2012-05-31 | 2014-02-05 | 攀钢集团成都钢钒有限公司 | Molten vanadium-titanium iron desulfurizing agent and preparation method thereof as well as desulfurization method using desulfurizing agent |
| CN102796847A (en) * | 2012-08-31 | 2012-11-28 | 宝山钢铁股份有限公司 | Premelting type molten iron slag regulator capable of reducing melting point of desulfurized molten iron slag |
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