CN106755738A - A kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate - Google Patents
A kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate Download PDFInfo
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- CN106755738A CN106755738A CN201510820693.3A CN201510820693A CN106755738A CN 106755738 A CN106755738 A CN 106755738A CN 201510820693 A CN201510820693 A CN 201510820693A CN 106755738 A CN106755738 A CN 106755738A
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Abstract
The present invention relates to a kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate, deactivating magnesium powder is in the low technical problem of injection later-stage utilization rate in mainly solving existing composite blowing Desulphuring Process of Molten Iron.The technical scheme is that：The molten iron that top spray gun is immersed in ladle, calculates the quality of deactivating magnesium powder needed for desulfurizing iron；Powder injection desulphurization early stage, fluidised form fossil ashes is entered by top spray gun to the Injection In Molten Iron in ladle；The 0.08-0.16kg/ tons of fluidization pulverized limestone of iron is sprayed into powder injection desulphurization early stage；The powder injection desulphurization composite blowing phase, deactivating magnesium powder needed for desulfurizing iron is all sprayed into molten iron, the injection composite blowing phase is divided into n (2≤n≤5) section, is sprayed into the molten iron in ladle by top spray gun at each section and sprays into fluidization pulverized limestone and deactivating magnesium powder simultaneously；In the powder injection desulphurization later stage, fluidised form fossil ashes is entered to the Injection In Molten Iron in ladle by top spray gun.The inventive method is simple to operate, and desulphurization cost is low.
Description
Technical field
The present invention relates to a kind of molten iron pretreatment desulfurizing technology, more particularly to a kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate belongs to technical field of ferrous metallurgy.
Background technology
Sulphur is the harmful element in most of steel grades, deteriorates the mechanical property of steel, therefore control sulfur content is the key for smelting high-quality low-sulfur steel.As a rule, the desulphurization cost of steel making working procedure is about 1 in the ratio of molten iron pretreatment, converter smelting and liquid steel refining:7:14, desulphurization cost is minimum in hot metal pre process procedures.During the steel grade of smelting low-sulfur or super-low sulfur, in hot metal pre process procedures, generally the sulphur mass content in molten iron is taken off to less than 0.005%.
Existing molten iron pretreatment powder injection desulphurization technique is that, using desulfuring spray gun, single spraying or composite blowing desulfurization powder carry out hot-metal bottle blowing desulfurization to convey gas with nitrogen.Desulfurization powder the more commonly used at present mainly fluidization pulverized limestone and deactivating magnesium powder, conventional blowing process is composite blowing.For composite blowing, during Sulfur Content in Hot Iron is removed, as process sulfur content is gradually reduced, the utilization rate of deactivating magnesium powder is remarkably decreased magnesium powder.When especially Sulfur Content in Hot Iron mass content is down to less than 0.01%, the utilization rate of deactivating magnesium powder is down to 20% or so by more than the 80% of early stage.Generally, the injecting velocity of compound powder and injection ratio are changeless during whole injection, and this is easy for causing deactivating magnesium powder low in injection later-stage utilization rate, causes deactivating magnesium powder to waste.
Patent application CN200510047784.4, CN200710158579.4, CN201380005806.3 disclose molten iron pretreatment powder injection desulphurization technique from different perspectives, but are not related to the utilization rate of desulfurization powder.Patent application CN200510047784.4, disclose a kind of efficient magnesium base molten iron preconditioning technique, hollow revolution nozzle with agitating paddle is installed in hot-metal bottle, make bubble tinyization being blown into, improve the desulfating and deoxidation reaction efficiency of magnesium vapor, improve deactivating magnesium powder utilization rate, this patent is mainly by addition equipment raising magnesium powder utilization rate.Patent application CN200710158579.4, discloses a kind of magnesium desulphurization method for molten iron pretreatment, develops the pulvis that a kind of molten iron pretreatment magnesium desulfurization is used, including metal magnesium powder, blast furnace slag and lime are the pulvis of raw material.
The solution effective to the whole constant caused low shortage of deactivating magnesium powder utilization rate of speed of blowing powder in composite blowing Desulphuring Process of Molten Iron in industry.
The content of the invention
It is an object of the invention to provide a kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate, deactivating magnesium powder is in the low technical problem of injection later-stage utilization rate in mainly solving existing composite blowing Desulphuring Process of Molten Iron.
The technical solution adopted by the present invention is：
1）The molten iron that top spray gun is immersed in ladle, the mass content of the Sulfur Content in Hot Iron be 0.01%-0.1%, the mass content of silicon be 0.2%-0.6%, molten iron temperature be 1250-1450 DEG C, according to the quality of molten iron, the mass content of Sulfur Content in Hot Iron in ladle and the mass content of target sulphur calculates the quality of deactivating magnesium powder needed for desulfurizing iron in desulfurized molten iron；
2）Powder injection desulphurization early stage, fluidised form fossil kg/ tons of iron of ashes 0.08-0.16 is entered by top spray gun to the Injection In Molten Iron in ladle, and injecting velocity is 20-60kg/min, carrier gas flux 0.7-1.0Nm3/ min, its main purpose is to stir molten iron, is that dynamic conditions is created in the desulfurization of next step compound powder, while prevent from being injected directly into deactivating magnesium powder causing spray gun to block；
3）The powder injection desulphurization composite blowing phase, deactivating magnesium powder needed for desulfurizing iron is all sprayed into molten iron, the injection composite blowing phase is divided into n (2≤n≤5) section, sprayed into the molten iron in ladle by top spray gun at each section and spray into fluidization pulverized limestone and deactivating magnesium powder simultaneously, each section of injecting velocity of deactivating magnesium powder is a, and a is 5-15kg/min, and the same section of injecting velocity of fluidization pulverized limestone is b*a, b values are 2-8, carrier gas flux 0.7-1.0Nm3/min；
4) the powder injection desulphurization later stage, fluidised form fossil kg/ tons of iron of ashes 0.08-0.16 is entered to the Injection In Molten Iron in ladle by top spray gun, injecting velocity is 20-60kg/min, carrier gas flux 0.7-1.0Nm3/ min, after the powder injection desulphurization composite blowing phase, the sulfur content in molten iron is relatively low, and close to desulfurization desired value, the utilization rate for continuing to spray into deactivating magnesium powder is very low, and magnesium powder gasifies spillings substantially, causes waste；Therefore, the main application for now spraying into fluidization pulverized limestone does not lie in desulfurization, and is to improve the desulfurization product in molten iron basicity of slag, fixed slag, suppresses quickly to return sulphur；Agitation molten iron, accelerates desulfurization product sulfide M gS, CaS etc. and floats into scum；Pipeline is cleaned simultaneously, prevents spray gun from blocking.
Further, step 3 of the present invention）In, the injecting velocity of each section of deactivating magnesium powder of powder injection desulphurization composite blowing phase respectively be a, a-1, a-2, a-n；The injecting velocity of same section of fluidization pulverized limestone respectively be b*a,（b+0.5）*（a-1）、（B+1）*（a-2）、···、（b+0.5n）*（a-n）.
The composite blowing phase of molten iron pretreatment desulfurizing is divided into 2-5 sections by the present invention, and every section of deactivating magnesium powder injecting velocity is set from high to low by injection order, according to a-n；The value of the injecting velocity of the injecting velocity/deactivating magnesium powder of fluidization pulverized limestone is set from low to high by injection order, is changed according to b+0.5n ratios；When the powder injection desulphurization composite blowing phase starts injection deactivating magnesium powder and fluidization pulverized limestone, molten iron temperature is high, molten iron viscosity is small, and good fluidity, desulfurization kinetics condition is good；Meanwhile, the initial sulfur content in molten iron is high, and quickly, the desulfurization utilization rate of deactivating magnesium powder is very high for the speed of magnesium desulfurization；The desulfurization later stage of powder injection desulphurization composite blowing phase, Sulfur Content in Hot Iron content is low, [Mg] [S] product under uniform temperature is certain, with Sulfur Content in Hot Iron reaction needed for be dissolved in molten iron in content of magnesium it is high, the controlling unit of this process essentially consists in the dissolving of the magnesium bubble after gasification, therefore being blown the later stage reduces injecting velocity, the value for improving the injecting velocity of the injecting velocity/deactivating magnesium powder of fluidization pulverized limestone advantageously reduces the rate of climb of magnesium bubble after gasification, the extension rise time, allow more magnesium gas bubbles that desulphurization reaction is participated in molten iron, utilization rate of the deactivating magnesium powder in later stage composite blowing phase is improved with this.
The low industry problem of the whole constant caused deactivating magnesium powder utilization rate of the speed of blowing powder in present invention solution composite blowing Desulphuring Process of Molten Iron.
The present invention has following good effect compared to existing technology：
1st, the powder injection desulphurization composite blowing phase is controlled to 2-5 sections by the inventive method, each section sets different pulvis injecting velocity and pulvis injection ratios respectively, deactivating magnesium powder injecting velocity is from fast to slow, the value of the injecting velocity of the injecting velocity/deactivating magnesium powder of fluidization pulverized limestone from low to high, utilization rate of the deactivating magnesium powder in the composite blowing later stage during composite blowing is improved, raising deactivating magnesium powder overall utilization rate is reached.
2nd, the inventive method is simple to operate, and desulphurization cost is low.
Specific embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only illustrative of the invention and is not intended to limit the scope of the invention.
The molten iron inclusion quantity for containing molten iron in the embodiment of the present invention is 250 tons, and the mass content of target sulphur is 0.003% in desulfurized molten iron, and injection carrier gas is nitrogen, and it is 0.8Nm that nitrogen flow is whole3/ min, the fluidization lime injection amount of powder injection desulphurization early stage of the present invention is 0.16kg/ tons of iron * weight of molten iron；The fluidization lime injection amount in powder injection desulphurization later stage is 0.08kg/ tons of iron * weight of molten iron；The quality of deactivating magnesium powder needed for desulfurizing iron is according to the quality of molten iron, the mass content of Sulfur Content in Hot Iron in ladle and the mass content of target sulphur is calculated using desulfurization model in desulfurized molten iron；As shown in table 1, as shown in table 2, embodiment sulfur removal technology and magnesium powder utilization rate are as shown in table 3 for desulfuration injection speed and desulfurization powder proportioning parameter for embodiment of the present invention molten iron parameter.
From table 1 and table 3, when the weight/mass percentage composition of Sulfur Content in Hot Iron is identical with the weight/mass percentage composition of target sulphur in desulfurized molten iron before desulfurization, heat is blown using segmented of the present invention, its deactivating magnesium powder utilization rate is apparently higher than existing common process.
The weight/mass percentage composition of target sulphur in the embodiment of the present invention molten iron parameter of table 1 and desulfurized molten iron
The embodiment of the present invention desulfuration injection speed of table 2 and desulfurization powder proportioning parameter
The embodiment of the present invention sulfur removal technology of table 3 and deactivating magnesium powder utilization rate
Claims (2)
1. it is a kind of improve molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate method, it is characterized in that, comprise the following steps：
1）The molten iron that top spray gun is immersed in ladle, the mass content of the Sulfur Content in Hot Iron be 0.01%-0.1%, the mass content of silicon be 0.2%-0.6%, molten iron temperature be 1250-1450 DEG C, according to the quality of molten iron, the mass content of Sulfur Content in Hot Iron in ladle and the mass content of target sulphur calculates the quality of deactivating magnesium powder needed for desulfurizing iron in desulfurized molten iron；
2）Powder injection desulphurization early stage, fluidised form fossil kg/ tons of iron of ashes 0.08-0.16 is entered by top spray gun to the Injection In Molten Iron in ladle, and injecting velocity is 20-60kg/min, carrier gas flux 0.7-1.0Nm3/min；
3）The powder injection desulphurization composite blowing phase, deactivating magnesium powder needed for desulfurizing iron is all sprayed into molten iron, the injection composite blowing phase is divided into n (2≤n≤5) section, sprayed into the molten iron in ladle by top spray gun at each section and spray into fluidization pulverized limestone and deactivating magnesium powder simultaneously, each section of injecting velocity of deactivating magnesium powder is a, and a is 5-15kg/min, and the same section of injecting velocity of fluidization pulverized limestone is b*a, b values are 2-8, carrier gas flux 0.7-1.0Nm3/min；
4) the powder injection desulphurization later stage, fluidised form fossil kg/ tons of iron of ashes 0.08-0.16 is entered to the Injection In Molten Iron in ladle by top spray gun, injecting velocity is 20-60kg/min, carrier gas flux 0.7-1.0Nm3/min。
2. a kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate as claimed in claim 1, it is characterized in that, the injecting velocity of described each section of deactivating magnesium powder of powder injection desulphurization composite blowing phase respectively be a, a-1, a-2, a-n；The injecting velocity of same section of fluidization pulverized limestone respectively be b*a,（b+0.5）*（a-1）、（B+1）*（a-2）、···、（b+0.5n）*（a-n）.
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Cited By (5)
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| CN109811107A (en) * | 2017-11-21 | 2019-05-28 | 上海梅山钢铁股份有限公司 | A method of control molten iron pre-desulfurization process sulfur content |
| CN110205435A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of the molten iron pretreatment desulfurizing in converter |
| CN110964870A (en) * | 2018-09-28 | 2020-04-07 | 上海梅山钢铁股份有限公司 | Method for pre-desulfurizing molten iron of oil residue |
| CN111206134A (en) * | 2020-02-24 | 2020-05-29 | 本钢板材股份有限公司 | Method for improving desulfurization effect by adding limestone in molten iron desulfurization by blowing method |
| CN111471833A (en) * | 2020-05-27 | 2020-07-31 | 济南银城铸造厂 | Desulfurization pretreatment process for molten iron for casting |
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| CN103924025A (en) * | 2014-03-27 | 2014-07-16 | 东北大学 | Method for pre-desulfuration of combined-blowing molten iron at top and bottom in ladle |
| CN104975138A (en) * | 2014-04-11 | 2015-10-14 | 上海梅山钢铁股份有限公司 | Method of preparing ultralow-sulfur molten iron through injection of molten iron pre-treatment composite desulfurizer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109811107A (en) * | 2017-11-21 | 2019-05-28 | 上海梅山钢铁股份有限公司 | A method of control molten iron pre-desulfurization process sulfur content |
| CN110964870A (en) * | 2018-09-28 | 2020-04-07 | 上海梅山钢铁股份有限公司 | Method for pre-desulfurizing molten iron of oil residue |
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| CN111206134A (en) * | 2020-02-24 | 2020-05-29 | 本钢板材股份有限公司 | Method for improving desulfurization effect by adding limestone in molten iron desulfurization by blowing method |
| CN111471833A (en) * | 2020-05-27 | 2020-07-31 | 济南银城铸造厂 | Desulfurization pretreatment process for molten iron for casting |
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Application publication date: 20170531 |