CN104694688A - Magnesium compound desulfuration slag slag-state regulator and magnesium compound desulfuration slag-regulation method - Google Patents
Magnesium compound desulfuration slag slag-state regulator and magnesium compound desulfuration slag-regulation method Download PDFInfo
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Abstract
The invention relates to a magnesium compound desulfuration slag slag-state regulator and a magnesium compound desulfuration slag-regulation method and belongs to the field of ferrous metallurgy. The technical problem is solved by the magnesium compound desulfuration slag slag-state regulator. The magnesium compound desulfuration slag slag-state regulator is made of the following components, by weight percentage, 60%-80% of aluminum ash powder and 20%-40% of sodium carbonate powders. The magnesium compound desulfuration slag slag-state regulator is simple in composition, simple and easy to do in preparation technology, good in desulfuration effect and slag-regulation effect, capable of reducing molten iron or vanadium extraction half-steel desulfuration deslagging iron losses, therefore, the desulfuration cost is reduced significantly, the waste aluminum ashes generated from aluminum smelting industries are utilized effectively, and the obvious environmental and economic effects are achieved. According to the magnesium compound desulfuration slag-regulation method, the desulfuration slag-state regulator is added to passivated lime, an original lime stock bin and an original lime injection pot in the desulfuration technology are utilized, the slag regulation is performed directly in the desulfuration process unlike all present slag-regulation methods of manually adding desulfuration regulators, and the heavy manual labor is eliminated.
Description
Technical field
The present invention relates to magnesium composite desulfate slag slag state adjusting agent and magnesium composite desulfate Slag modification method, belong to field of steel metallurgy.
Background technology
The outer pre-treatment of molten iron furnace has obtained steel industry widespread use as the cost-effective desulfurization means of one.Secondary desulfurization plays important effect to optimization smelting technology, the quality improving steel, development fine steel grade, raising metallurgical comprehensive benefit, becomes indispensable operation in ferrous metallurgy.
Magnesium compound desulfurizing process is the one of the conventional outer pretreatment technology of molten iron furnace.The desulfuration efficiency of this technique to molten iron or half steel is high and stable, thus adopted by most iron and steel enterprise, but there is the problem of " desulfurization slag slag state is rarer, slag sluicing system weak effect, MFe high (reaching 60% ~ 80%) in slag ", cause magnesium composite blowing desulfurization iron loss high, and desulfurization slag not easily scratches clean, cause steel making working procedure to return sulphur seriously, constrain the raising of magnesium composite blowing desulfurization production capacity and the reduction of cost, meanwhile, the plan that have impact on steel making working procedure variety steel is cashed.
When domestic and international enterprise carries out desulfurizing iron, all pay much attention to and control back sulphur and reduce desulfurization iron loss.Usually, add shoddye agent and change desulfurization slag viscosity, be with iron to reduce in slag.The shoddye agent adopted comprises sodium aluminum fluoride, glass cullet, aluminium scrap brick, and fluorite etc.; Polysius company proposes POLOP patented technology (spiral powder conveying technology), and without the need to newly-increased any sweetener, slag supplying agent adds in sweetening agent by fixed mixing ratio, plays residue adjustment effect in sweetening process, and what reach the best falls iron effect.In addition, adopt coagulation agent residue collection slag, be conducive to removing of slag, reduce iron loss of skimming.Certain company external adds the properties-correcting agent of 4% in sweetening agent, reduce metallic iron 10 percentage points in desulfurization slag, but this properties-correcting agent cost is higher.Domestic Duo Jia steel mill adds modification agent in molten iron or half steel sweetening process, has certain to fall iron effect, but remarkable, and in the desulfurization slag of Baosteel, Mei Gang, Wuhan Iron and Steel Plant, Ma Gang, heavy steel, metallic iron is still up to 50% ~ 60%.In addition, desulfurization residue adjustment or coagulation agent residue collection slag are all Manual material feeding operation, labor intensive.
The Chinese invention patent of sweetening process residue adjustment mainly contains 5, is Manual material feeding.Application number be 201310616431 patent of invention provide a kind of hot metal containing V-Ti calcium-based desulfurization slag supplying agent and preparation method thereof and desulfurization Slag modification method.Described preparation method comprises: mixed by the light ash of the active lime powder of 60 ~ 80 parts by weight, the Fluorspar Powder of 10 ~ 20 parts and 10 ~ 15 parts, obtain calcium-based desulfurization slag supplying agent.The composition of described calcium-based desulfurization slag supplying agent comprises by weight percentage: be not more than the S of 0.10%, is not more than the P of 0.10%, the CaO of 60% ~ 80%, the CaF of 8% ~ 18%
2, the Na of 10% ~ 15%
2cO
3, the SiO of 2% ~ 8%
2with the Al being not more than 1%
2o
3.Described desulfurization Slag modification method comprises and adds in hot metal containing V-Ti by calcium-based desulfurization slag supplying agent as above, carries out desulfurization residue adjustment to hot metal containing V-Ti.This beneficial effect of the 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.CN201310616236 patent of 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.This beneficial effect of the 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.CN201310636599 patent of invention provides a kind of hot metal containing V-Ti silica-based desulphurization slag modifier and preparation method thereof and desulfurization Slag modification method.Described preparation method comprises: by by weight 60 ~ 80 parts quartz sand powder, the Fluorspar Powder of 2 ~ 8 parts, the light ash of 5 ~ 10 parts and 10 ~ 20 parts aluminum oxide powder mix, obtain silica-based desulphurization slag modifier.The composition of described silica-based desulphurization slag modifier comprises by weight percentage: be not more than the S of 0.10%, is not more than the P of 0.10%, the SiO of 60% ~ 80%
2, the CaF of 1.5% ~ 6%
2, the Na of 5% ~ 9%
2cO
3, the CaO of 0% ~ the 3% and Al of 8% ~ 18%
2o
3.Described desulfurization Slag modification method comprises and adds in hot metal containing V-Ti by silica-based desulphurization slag modifier as above, carries out residue adjustment desulfurization to hot metal containing V-Ti.This beneficial effect of the invention comprises: can reduce sulfur return amount after desulfurization of molten iron; Iron loss of skimming can be reduced.CN201310632828 patent of invention provides a kind of method reducing hot metal containing V-Ti desulphurization and slag skimming iron loss, it is characterized in that, adds the desulphurization slag modifier of 1.25kg/t molten iron ~ 1.75kg/t molten iron and stirs, then carry out desulfurization in hot metal containing V-Ti; After desulfurization terminates, hot metal containing V-Ti after desulfurization is skimmed, when to take off to the residual content of desulfurization slag be 2/5 ~ 3/5 of the former desulfurization quantity of slag, add the desulphurization slag modifier of 1.25kg/t molten iron ~ 1.75kg/t molten iron again and stir, then proceeding to skim, it is most to be taken off to desulfurization slag, wherein, by weight percentage, described desulphurization slag modifier comprises CaO30 ~ 40%, SiO
230 ~ 40%, Al
2o
38 ~ 16%, Na
2cO
34 ~ 9%, CaF
24 ~ 8%, S0.010 ~ 0.080%, P0.010 ~ 0.080%.CN201210320261 patent of invention provides 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%.This invention pre-molten molten iron slag supplying agent 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.
From existing documents and materials and patent of invention, the complicated component of sweetening process residue adjustment slag supplying agent used, its cost is higher, and slag supplying agent is Manual material feeding, adds human cost.
Summary of the invention
The technical problem that the present invention solves is to provide magnesium composite desulfate slag slag state adjusting agent.
Magnesium composite desulfate slag slag state adjusting agent of the present invention, is made up of the component of following weight percent: aluminium ashes 60% ~ 80%, light ash 20% ~ 40%.
Wherein, containing calcium oxide and aluminium sesquioxide in described aluminium ashes, wherein, the weight percent of aluminium sesquioxide is greater than 60%.
Further, the activeconstituents of described magnesium composite desulfate slag slag state adjusting agent is counted by weight: the CaO of 10 ~ 30 parts, the Na of 10 ~ 30 parts
2the Al of O and 30 ~ 60 part
2o
3.
Further, the particle diameter of described aluminium ashes and light ash is below 0.5mm.
Second technical problem that the present invention solves is to provide magnesium composite desulfate Slag modification method, and the method, without the need to manually adding desulfurization adjusting agent, eliminates heavy hand labor.
Magnesium composite desulfate Slag modification method of the present invention, comprises the steps:
A, above-mentioned magnesium composite desulfate slag slag state adjusting agent is carried out fine grinding and surface passivation together with quickened lime, passivator, obtain slag state adjusting type passive lime;
B, slag state adjusting type passive lime is put into the lime bin of magnesium composite desulfate system, utilize lime blowing process to add slag state adjusting type passive lime, the adjustment of slag state is carried out to magnesium desulfurization slag.
Wherein, the granularity of described slag state adjusting type passive lime is less than 0.1mm.
Wherein, in a step, by weight, magnesium composite desulfate slag slag state adjusting agent: quickened lime: passivator=5 ~ 25:75 ~ 95:0.1 ~ 0.3.
Further, described passivator is methyl-silicone oil, hydroxy silicon oil or dimethyl silicone oil.
Magnesium composite desulfate slag slag state adjusting agent composition of the present invention is simple, preparation is simple, desulfurization and residue adjustment effective, molten iron or vanadium extraction half steel desulphurization and slag skimming iron loss 5 ~ 10kg/t iron can be reduced, thus significantly reduce desulphurization cost, and effectively make use of the wasted aluminium ash of aluminum smelting industry generation, there is obvious environmental protection and economy effect.
Magnesium composite desulfate Slag modification method of the present invention, desulfurization slag state adjusting agent is added in passive lime, utilize the original lime bin of sulfur removal technology and lime winding-up tank, directly residue adjustment is carried out in sweetening process, this is different from current all Slag modification method manually adding desulfurization adjusting agent, so, heavy hand labor is eliminated.
Embodiment
Magnesium composite desulfate slag slag state adjusting agent of the present invention, is made up of the component of following weight percent: aluminium ashes 60% ~ 80%, light ash 20% ~ 40%.
Wherein, described aluminium ashes is that the slag during aluminium processed is produced processes through cooling, and the main component of aluminium ashes is calcium oxide and aluminium sesquioxide, and the weight percent of the aluminium sesquioxide in aluminium ashes is preferably more than 60%.
Further, the activeconstituents of described magnesium composite desulfate slag slag state adjusting agent is counted by weight: the CaO of 10 ~ 30 parts, the Na of 10 ~ 30 parts
2the Al of O and 30 ~ 60 part
2o
3.In slag state adjusting agent, aluminium sesquioxide and calcium oxide mainly come from aluminium ashes, and sodium oxide comes from light ash.
In the composition of magnesium composite desulfate slag slag state adjusting agent of the present invention, also containing inevitable impurity S, P, they are inevitable impurity in aluminium ashes and light ash, its component requirements S, P are all not more than 0.2% of magnesium composite desulfate slag slag state adjusting agent weight, if this is due to S, P too high levels, the Sulfur capacity of desulfurization slag can be reduced in residue adjustment process, thus affect sweetening effectiveness.
Further, the particle diameter of described aluminium ashes and light ash is below 0.5mm.
The preparation method of magnesium composite desulfate slag slag state adjusting agent of the present invention is the mixing of this area routine, such as: in proportion that aluminium ashes and light ash mix grinding is even, obtains magnesium composite desulfate slag slag state adjusting agent.
The present invention also provides magnesium composite desulfate Slag modification method, and the method, without the need to manually adding desulfurization adjusting agent, eliminates heavy hand labor.
Magnesium composite desulfate Slag modification method of the present invention, comprises the steps: a, magnesium composite desulfate slag slag state adjusting agent is carried out fine grinding and surface passivation together with quickened lime, passivator, obtain slag state adjusting type passive lime; B, slag state adjusting type passive lime is put into the lime bin of magnesium composite desulfate system, utilize original lime blowing process to add slag state adjusting type passive lime, the adjustment of slag state is carried out to magnesium desulfurization slag.
Further, the granularity of described slag state adjusting type passive lime is less than 0.1mm.
Conventional magnesium composite desulfate slag slag state adjusting agent all can adopt method of the present invention.In order to improve desulfurization and residue adjustment effect, preferred magnesium composite desulfate slag slag state adjusting agent is magnesium composite desulfate slag slag state adjusting agent of the present invention, namely of the present invention by aluminium ashes 60% ~ 80%, the magnesium composite desulfate slag slag state adjusting agent that light ash 20% ~ 40% is made.
Further, in a step, by weight, magnesium composite desulfate slag slag state adjusting agent: quickened lime: passivator=5 ~ 25:75 ~ 95:0.1 ~ 0.3.
The kind of passivator is more, and the passivator that this area is commonly used all is applicable to the present invention, and comprehensive passivation effect was considered originally with becoming, and described passivator is be preferably silicone oil, as: 201 methyl-silicone oils, hydroxy silicon oil, dimethyl-silicon wet goods.
Concrete, magnesium composite desulfate Slag modification method of the present invention can adopt following concrete technology to operate:
The preparation of a, slag state adjusting type passive lime: by magnesium composite desulfate adjusting agent and the little block quickened lime after fragmentation, and conventional passivator is sent in roller mill in the lump, carry out fine grinding and surface passivation, produce the slag state adjusting type passive lime of below granularity 0.1mm.The slag state adjusting type passive lime produced is stored in feed bin.
B, feeding: slag state adjusting type passive lime tank car is carried, and squeezes into the lime bin of magnesium composite desulfate system in the defeated mode of pipeline gas.
C, molten iron or the desulfurization of vanadium extraction half steel: the molten iron of 1200 ~ 1400 DEG C or vanadium extraction half steel are weighed tank with overhead traveling crane handling to desulfurization Special station.Open desulfuration operations program, adopt " passive lime and Inactivate granular magnesium " the two kinds of raw materials generally adopted at present to carry out composite desulfate to molten iron or vanadium extraction half steel.By the use of slag state adjusting type passive lime, in magnesium composite desulfate process, directly the adjustment of slag state is carried out to magnesium desulfurization slag, formed rapidly the few good desulfurization slag of iron content.
D, to skim: the molten iron after desulfurization or the heavy tank of vanadium extraction half steel are sent into station of skimming, adopts slag removal machine to remove desulfurization slag.Subsequent processing steel-making sent into by molten iron after skimming or vanadium extraction half steel.
Other concrete operations modes of the NM sulfur removal technology of the present invention and condition all can be same as the prior art, and as well known to those skilled in the art to this, therefore not to repeat here.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
By even for the light ash mix grinding of 60% aluminium ashes by weight and 40%, obtain magnesium composite desulfate slag slag state adjusting agent.The composition of gained magnesium composite desulfate slag slag state adjusting agent comprises by weight percentage: S 0.20%, P 0.20%, CaO 20%, Na
2o 20%, Al
2o
350%.
By the magnesium composite desulfate adjusting agent of preparation and the little block quickened lime after fragmentation, and conventional passivator 201 methyl-silicone oil is sent in roller mill in the lump, carries out fine grinding and surface passivation, produces the slag state adjusting type passive lime of below granularity 0.1mm.Wherein, in mass ratio, magnesium composite desulfate slag slag state adjusting agent: quickened lime: passivator=5:75:0.1.Slag state adjusting type passive lime tank car is carried, and squeezes into the lime bin of magnesium composite desulfate system in the defeated mode of pipeline gas.
After whole Job readiness is good, open desulfuration operations program, use overhead traveling crane handling to desulfurization Special station heavy for the vanadium-bearing hot metal of 1200 DEG C tank (weight is 300t), and adopt " passive lime and Inactivate granular magnesium " two kinds of raw materials to carry out composite desulfate to molten iron.After desulfurization, heavy for the molten iron after desulfurization tank is sent into station of skimming, adopts slag removal machine to remove desulfurization slag.Subsequent processing steel-making sent into by molten iron after skimming.
By the use of slag state adjusting type passive lime, in magnesium composite desulfate process, directly the adjustment of slag state is carried out to magnesium desulfurization slag, formed rapidly the few good desulfurization slag of iron content.After testing, the Sulfur Content in Hot Iron content after desulfurization is 0.005%, and desulfurizing iron iron loss of skimming is 22.0kg/t iron, compared with the prior art desulfurization iron loss 32.0kg/t iron not adding this slag state adjusting agent, present invention reduces desulfurizing iron and to skim iron loss 10kg/t iron.
Embodiment 2
By even for the light ash mix grinding of 80% aluminium ashes by weight and 20%, obtain magnesium composite desulfate slag slag state adjusting agent.The composition of gained magnesium composite desulfate slag slag state adjusting agent comprises by weight percentage: S 0.20%, P 0.20%, CaO 30%, Na
2o 10%, Al
2o
360%.
By the magnesium composite desulfate adjusting agent of preparation and the little block quickened lime after fragmentation, and conventional passivator hydroxy silicon oil is sent in roller mill in the lump, carries out fine grinding and surface passivation, produces the slag state adjusting type passive lime of below granularity 0.1mm.Wherein, in mass ratio, magnesium composite desulfate slag slag state adjusting agent: quickened lime: passivator=25:95:0.3.Slag state adjusting type passive lime tank car is carried, and squeezes into the lime bin of magnesium composite desulfate system in the defeated mode of pipeline gas.
After whole Job readiness is good, open desulfuration operations program, use overhead traveling crane handling to desulfurization Special station heavy for the vanadium extraction half steel of 1400 DEG C tank (weight is 200t), and adopt " passive lime and Inactivate granular magnesium " two kinds of raw materials to carry out composite desulfate to molten iron.After desulfurization, heavy for the vanadium extraction half steel after desulfurization tank is sent into station of skimming, adopts slag removal machine to remove desulfurization slag.Subsequent processing steel-making sent into by vanadium extraction half steel after skimming.
By the use of slag state adjusting type passive lime, in magnesium composite desulfate process, directly the adjustment of slag state is carried out to magnesium desulfurization slag, formed rapidly the few good desulfurization slag of iron content.After testing, the Sulfur Content in Hot Iron content after desulfurization is 0.004%, and desulfurizing iron iron loss of skimming is 18.0kg/t iron, compared with the prior art desulfurization iron loss 23.0kg/t iron not adding this slag state adjusting agent, reduces vanadium extraction half steel desulphurization and slag skimming iron loss 5kg/t iron.
Embodiment 3
By even for the light ash mix grinding of 70% aluminium ashes by weight and 30%, obtain magnesium composite desulfate slag slag state adjusting agent.The composition of gained magnesium composite desulfate slag slag state adjusting agent comprises by weight percentage: S 0.20%, P 0.20%, CaO 10%, Na
2o 30%, Al
2o
330%.
By the magnesium composite desulfate adjusting agent of preparation and the little block quickened lime after fragmentation, and conventional passivator dimethyl silicone oil is sent in roller mill in the lump, carries out fine grinding and surface passivation, produces the slag state adjusting type passive lime of below granularity 0.1mm.Wherein, in mass ratio, magnesium composite desulfate slag slag state adjusting agent: quickened lime: passivator=20:80:0.2.Slag state adjusting type passive lime tank car is carried, and squeezes into the lime bin of magnesium composite desulfate system in the defeated mode of pipeline gas.
After whole Job readiness is good, open desulfuration operations program, use overhead traveling crane handling to desulfurization Special station heavy for the molten iron of 1300 DEG C tank (weight is 30t), and adopt " passive lime and Inactivate granular magnesium " two kinds of raw materials to carry out composite desulfate to molten iron.After desulfurization, heavy for the molten iron after desulfurization tank is sent into station of skimming, adopts slag removal machine to remove desulfurization slag.Subsequent processing steel-making sent into by molten iron after skimming.
By the use of slag state adjusting type passive lime, in magnesium composite desulfate process, directly the adjustment of slag state is carried out to magnesium desulfurization slag, formed rapidly the few good desulfurization slag of iron content.After testing, the Sulfur Content in Hot Iron content after desulfurization is 0.005%, and desulfurizing iron iron loss of skimming is 12.0kg/t iron, compared with the prior art desulfurization iron loss 19.5kg/t iron not adding this slag state adjusting agent, reduces desulfurizing iron and to skim iron loss 7.5kg/t iron.
Claims (8)
1. magnesium composite desulfate slag slag state adjusting agent, is characterized in that, be made up of the component of following weight percent: aluminium ashes 60% ~ 80%, light ash 20% ~ 40%.
2. magnesium composite desulfate slag slag state adjusting agent according to claim 1, is characterized in that: containing calcium oxide and aluminium sesquioxide in described aluminium ashes, wherein, the weight percent of aluminium sesquioxide is greater than 60%.
3. magnesium composite desulfate slag slag state adjusting agent according to claim 1 and 2, is characterized in that: the activeconstituents of described magnesium composite desulfate slag slag state adjusting agent is counted by weight: the CaO of 10 ~ 30 parts, the Na of 10 ~ 30 parts
2the Al of O and 30 ~ 60 part
2o
3.
4. the magnesium composite desulfate slag slag state adjusting agent according to any one of claims 1 to 3, is characterized in that: the particle diameter of described aluminium ashes and light ash is below 0.5mm.
5. magnesium composite desulfate Slag modification method, is characterized in that, comprises the steps:
A, the magnesium composite desulfate slag slag state adjusting agent described in Claims 1 to 4 is carried out fine grinding and surface passivation together with quickened lime, passivator, obtain slag state adjusting type passive lime;
B, slag state adjusting type passive lime is put into the lime bin of magnesium composite desulfate system, utilize lime blowing process to add slag state adjusting type passive lime, the adjustment of slag state is carried out to magnesium desulfurization slag.
6. magnesium composite desulfate Slag modification method according to claim 5, is characterized in that: the granularity of described slag state adjusting type passive lime is less than 0.1mm.
7. the magnesium composite desulfate Slag modification method according to claim 5 or 6, is characterized in that: in a step, by weight, magnesium composite desulfate slag slag state adjusting agent: quickened lime: passivator=5 ~ 25:75 ~ 95:0.1 ~ 0.3.
8. the magnesium composite desulfate Slag modification method according to any one of claim 5 ~ 7, is characterized in that: described passivator is methyl-silicone oil, hydroxy silicon oil or dimethyl silicone oil.
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| JP2022550951A (en) * | 2019-09-30 | 2022-12-06 | ジャミポル・リミテッド | Hot metal desulfurization in KR (KANBARA REACTOR) method |
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| CN104694688B (en) | 2017-03-15 |
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Effective date of registration: 20171211 Address after: 617000 Taoyuan street, Panzhihua, Sichuan, No. 90 Co-patentee after: Sichuan Pan Yan Technology Co., Ltd. Patentee after: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. Address before: 617000 Taoyuan street, Panzhihua, Sichuan, No. 90 Patentee before: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. |
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