CN102094100A - Molten iron dephosphorizing agent and application method thereof - Google Patents
Molten iron dephosphorizing agent and application method thereof Download PDFInfo
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- CN102094100A CN102094100A CN 201110065843 CN201110065843A CN102094100A CN 102094100 A CN102094100 A CN 102094100A CN 201110065843 CN201110065843 CN 201110065843 CN 201110065843 A CN201110065843 A CN 201110065843A CN 102094100 A CN102094100 A CN 102094100A
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Abstract
The invention discloses a molten iron dephosphorizing agent and an application method thereof. The dephosphorizing agent comprises the following components in percentage by weight: 75 to 85 percent of calcium oxide, 10 to 21 percent of iron oxide and 4 to 5 percent of calcium fluoride. The application method of the molten iron dephosphorizing agent sequentially comprises the following steps of: 1) weighing prepared pig iron, adding into an induction furnace, and starting to heat and melt the pig iron; 2) measuring the temperature and sampling after the pig iron is melted down, blowing oxygen in a molten pool from an oxygen pipe on the top of the furnace when the temperature is raised to 1,350+/-10 DEG C, and adding the premixed dephosphorizing agent in batches simultaneously, wherein 60 to 80 percent of dephosphorizing agent is added first, and the residual dephosphorizing agent is added after 3 to 5 minutes; and 3) continuously heating for 12 to 18 minutes, and finishing dephosphorization. By adjusting a ratio of the dephosphorizing agent to the oxygen, alkalinity and an adding mode, the consumption of the solid dephosphorizing agent is effectively reduced while high dephosphorizing rate is achieved, so that advantages are provided for the pretreatment of high-phosphorus molten iron in a converter.
Description
Technical field
The invention belongs to the steel production technical field, be meant a kind of molten iron dephosphorization agent and application method thereof particularly.
Background technology
The dephosphorizing agent that hot metal pretreatment is used always has mainly comprised oxygenant, fixing agent and fusing assistant three big elements, and it is phosphorus in the oxidation molten iron that its oxygenant mainly acts on, and often adopts the oxide compound of less stable, as Fe
2O
3, FeO, MnO
2Deng, fixing agent then is that oxidized phosphorus is combined in the slag securely so that remove, and the effect of fusing assistant is the fusing point that reduces dephosphorized slag, often selects the compound or the fluorochemical of metal for use.At present application number is that to disclose a kind of be the molten iron dephosphorization agent of raw material with the converter slag for 03115576.6 patent of invention, its component is (W%) converter slag 20～50, lime 15～28, ferriferous oxide 20～43, fluorite 0～3, soda 0～3 Wingdale 0～3, it selects the depleted converter slag is that raw materials cost is cheap, helps environmental protection, but because converter slag itself wherein is phosphorous, can influence the dephosphorization rate of dephosphorizing agent, and it is big to produce slag amount behind its dephosphorization, brings big workload to subsequent handling.
In addition, the dephosphorization rate of dephosphorizing agent is except outside the Pass having with the dephosphorizing agent component, and thermodynamic condition when also depending on dephosphorization and dynamic conditions, ideal dephosphorization thermodynamic condition are high basicity, the high quantity of slag, hyperoxia voltinism and lower temperature.In the actual production process, be about 0.1% low-phosphorous molten iron for phosphorus content, the quantity of slag level of higher dephosphorization rate correspondence is not high, and the organization and administration of production can be carried out smoothly.But for the middle high phosphorus hot metal of phosphorus content more than 0.2%, higher dephosphorization rate makes its corresponding quantity of slag level, will significantly reduce the Intake Quantity of hot metal ladle or converter, has a strong impact on to produce progress.Therefore, the pretreatment technology of middle high phosphorus hot metal dephosphorization needs the improved place of emphasis to be how to reduce the quantity of slag.And in the composition of dephosphorizing agent, have only oxygenant can consider to replace with gas oxygen.But improve the gas oxygen ratio, can cause carbon consumption aggravation in the dephosphorizing process, even the situation of a not decarburization of dephosphorization takes place.
Summary of the invention
Purpose of the present invention will provide a kind of molten iron dephosphorization agent and application method thereof exactly, utilizes this dephosphorizing agent centering high phosphorus hot metal dephosphorization pre-treatment can effectively reduce the dephosphorization quantity of slag, and realizes the purpose of dephosphorization guarantor carbon.
For achieving the above object, each component of molten iron dephosphorization agent of the present invention percentage ratio is by weight counted: calcium oxide 75～85%, and ferric oxide: 10～21%, Calcium Fluoride (Fluorspan) 4～5%.
The application method of described molten iron dephosphorization agent, the blowing technology of employing top blast oxygen may further comprise the steps successively:
1) pig iron for preparing is weighed back the adding in the induction furnace beginning heat fused pig iron;
2) treat the molten clear back thermometric sampling of the pig iron, when temperature rises to 1350 ± 10 ℃, in the molten bath, be blown into oxygen from the furnace roof oxygen hose, add the dephosphorizing agent that is pre-mixed simultaneously in batches, first adds 60～80% of total consumption, adds the residue dephosphorizing agent at interval behind 3～5min;
3) continue heating, dephosphorization finishes behind 12～18min;
Its special character is: to phosphorus content is 0.2～0.5% medium-phosphorus hot metal, step 2) described dephosphorizing agent consumption is 8～10% of described pig iron weight, the described oxygen weight that is blown into is 1.5～3 times of the contained oxygen weight of ferric oxide in the described dephosphorizing agent; To phosphorus content is 0.5%～1% high phosphorus hot metal, step 2) described dephosphorizing agent consumption is 10～15% of described pig iron weight, the described oxygen weight that is blown into is 3～5 times of the contained oxygen weight of ferric oxide in the described dephosphorizing agent.
Further, step 2) after first dephosphorizing agent adds described in, adds the residue dephosphorizing agent at interval behind 2.5～3.5min again.
Each composition Design principle of molten iron dephosphorization agent of the present invention and dephosphorization technology principle thereof are as follows:
Calcium oxide is a fixing agent, plays the phosphorus of oxidation is combined in the slag securely to act on; And the calcium oxide ratio that traditional dephosphorizing agent adopts is no more than 70%, the present invention adopts calcium oxide and content thereof to be controlled at 75～85% scopes, be because in order to reduce the dephosphorizing agent consumption, need improve the calcium oxide consumption as far as possible, make dephosphorized slag be in heterogeneous state, but too high calcium oxide consumption will cause too thickness of dephosphorized slag, make slag lose dephosphorizing capacity.Ferric oxide is an oxygenant, the content of ferric oxide is about 30% in traditional dephosphorizing agent, the present invention selects 10～21% lower scopes for use, in concrete dephosphorization operation, need in conjunction with selecting for use the portion gas oxo for solid oxygen, when guaranteeing dephosphorization rate, further reduced the consumption of solid dephosphorizing agent like this.The Calcium Fluoride (Fluorspan) fusing assistant can reduce the dephosphorizing agent fusing point, and its content is controlled at 4～5%, because low excessively Calcium Fluoride (Fluorspan) consumption will cause too thickness of slag, and too high Calcium Fluoride (Fluorspan) consumption will increase the consumption of solid dephosphorizing agent.
When the present invention carries out the dephosphorization of molten iron processing at the described molten iron dephosphorization agent of application, be the purpose that realizes dephosphorization guarantor carbon, with the gas oxygen replacement solid oxygen of rational proportion, in the consumption of minimizing solid oxygen, for dephosphorization provides sufficient dynamic conditions.After treating in the dephosphorizing process that the pig iron melts clearly, when temperature rises to 1350 ± 10 ℃, begin to fall the rifle oxygen blast, maintain dephosphorization effect the best in this temperature range during dephosphorization.Dephosphorizing agent by adding at twice, can be regulated the dephosphorized slag temperature, make the dephosphorization temperature be in favourable scope, can regulate simultaneously dephosphorized slag basicity make dephosphorized slag maintain high basicity scope and dephosphorization all the time at concert pitch.It to phosphorus content 0.2～0.5% medium-phosphorus hot metal, step 2) selected dephosphorizing agent consumption is to join 8～10% of pending pig iron weight in the stove, corresponding step 2) the required gas oxygen weight that is blown into is 1.5～3 times of the contained oxygen weight of ferric oxide in the described dephosphorizing agent; To phosphorus content is 0.5%～1% high phosphorus hot metal, step 2) described dephosphorizing agent consumption is 10～15% of described pig iron weight, step 2) the described oxygen weight that is blown into is 3～5 times of the contained oxygen weight of ferric oxide in the described dephosphorizing agent.During actually operating, can determine earlier that the dephosphorizing agent consumption calculates the wherein content of ferric oxide, convert out the weight content of oxygen element in the ferric oxide again, the weight of the oxygen that is blown into is the multiple of the weight of oxygen element in the ferric oxide, actually converts the weight of oxygen to standard state lower volume quantity when being blown into oxygen and gets final product.The midfeather time that adds dephosphorizing agent for twice is 3～5min, is preferably 2.5～3.5min, can in time reduce the temperature of dephosphorized slag, guarantees that dephosphorization rate is in the optimal heat mechanical condition, and dephosphorizing agent adds back continuation heating 12～18min fully can be finished by dephosphorization.
The present invention is directed to middle high phosphorus hot metal, adopt high efficiency dephosphorating agent and corresponding air blowing agitation condition, replace solid oxygen with gas oxygen, not only can provide good agitation condition, improve the dephosphorization dynamic conditions, and can reduce solid oxide agent consumption (being the dephosphorization quantity of slag), thereby can realize ideal heat, dynamic conditions.Simultaneously, calcium oxide content is higher than 75% in the dephosphorizing agent of the present invention, dephosphorized slag is liquid phase and the simultaneous nonhomogeneous system of solid phase in dephosphorizing process, viscosity is higher, compare with the liquid phase dephosphorizing agent of traditional suboxide calcium contents, the consumption that removes the heterogeneous dephosphorizing agent of phosphorus of equal amts from molten iron can significantly reduce.Like this, both reached the purpose that realizes high efficiency dephosphorating, and can avoid the consumption of carbon over oxidation again, and reduced the consumption of dephosphorizing agent and the amount that reduces dephosphorized slag simultaneously, the assurance subsequent handling is normally carried out smoothly.The present invention when guaranteeing to realize higher dephosphorization rate, effectively reduces solid-state dephosphorizing agent consumption by regulating dephosphorizing agent gas oxygen ratio, basicity and adding mode, provides favourable condition thereby carry out the high phosphorus hot metal pre-treatment for converter.
Embodiment
Below in conjunction with specific embodiment molten iron dephosphorization agent of the present invention and application method thereof are described in further detail.
Embodiment 1
Its each set of dispense ratio of dephosphorizing agent percentage ratio is by weight counted calcium oxide 80%, ferric oxide 16%, Calcium Fluoride (Fluorspan) 4%; Detect the initial phosphorus content 0.290% of pending molten iron, carbon content 4.15%.
Dephosphorizing process:
1) pig iron for preparing is weighed 200kg adds in the induction furnace beginning heat fused pig iron;
2) treat the molten clear back thermometric sampling of the pig iron, when temperature rises to 1350 ℃, be blown into oxygen from the furnace roof oxygen hose in the molten bath, add the dephosphorizing agent that is pre-mixed simultaneously in batches, first adds after 70%, 5 minute and adds remaining 30%; Wherein, selected dephosphorizing agent consumption is that 8% of pig iron weight is 16kg; The oxygen weight that is blown into is 2.304kg, and the volume of being converted under the standard state is 1.61m
3
3) continue heating dephosphorization end after 12 minutes.
Sampling detects after the dephosphorization treatment, and molten iron is phosphorous 0.0053% after the dephosphorization treatment, and dephosphorization rate is 98.17%.Wherein: dephosphorization rate=(the initial phosphorus content of molten iron-dephosphorization of molten iron is handled the back the phosphorus content)/initial phosphorus content of molten iron * 100%.
Molten iron carbon containing 3.11% after the dephosphorization treatment, carbon-drop rate are 25.06%.Wherein: carbon-drop rate=(molten iron initial carbon content-dephosphorization of molten iron is handled the back carbon content)/molten iron initial carbon content * 100%.
Embodiment 2
Its each component of dephosphorizing agent percentage ratio is by weight counted calcium oxide 75%, ferric oxide 20%, Calcium Fluoride (Fluorspan) 5%; Detect the initial phosphorus content 0.340% of pending molten iron, carbon content 4.18%.
Dephosphorizing process:
1) pig iron for preparing is weighed 210kg adds in the induction furnace beginning heat fused pig iron;
2) treat the molten clear back thermometric sampling of the pig iron, when temperature rises to 1360 ℃, be blown into oxygen from the furnace roof oxygen hose in the molten bath, add the dephosphorizing agent that is pre-mixed simultaneously in batches, first adds after 60%, 4 minute and adds remaining 40%; Wherein, selected dephosphorizing agent consumption is that 10% of pig iron weight is 21kg; The oxygen weight that is blown into is 1.89kg, and the volume of being converted under the standard state is 1.32m
3
3) continue heating dephosphorization end after 18 minutes.
Sampling detects after the dephosphorization treatment, and molten iron is phosphorous 0.017% after the dephosphorization treatment, and dephosphorization rate is 95.00%.Molten iron carbon containing 3.01% after the dephosphorization treatment, carbon-drop rate are 27.93%.
Embodiment 3
Its each component of dephosphorizing agent percentage ratio is by weight counted calcium oxide 80%, ferric oxide 15%, Calcium Fluoride (Fluorspan) 5%; Detect the initial phosphorus content 0.680% of pending molten iron, carbon content 4.03%.
Dephosphorizing process:
1) pig iron for preparing is weighed 190kg adds in the induction furnace beginning heat fused pig iron;
2) treat the molten clear back thermometric sampling of the pig iron, when temperature rises to 1340 ℃, be blown into oxygen from the furnace roof oxygen hose in the molten bath, add the dephosphorizing agent that is pre-mixed simultaneously in batches, first adds after 80%, 3 minute and adds remaining 20%; Wherein, selected dephosphorizing agent consumption is that 15% of pig iron weight is 28.5kg; The oxygen weight that is blown into is 3.848kg, and the volume of being converted under the standard state is 2.69m
3
3) continue heating dephosphorization end after 14 minutes.
Sampling detects after the dephosphorization treatment, and molten iron is phosphorous 0.11% after the dephosphorization treatment, and dephosphorization rate is 80.88%.Molten iron carbon containing 2.75% after the dephosphorization treatment, carbon-drop rate are 31.76%.
Embodiment 4
Its each component of dephosphorizing agent percentage ratio is by weight counted calcium oxide 85%, ferric oxide 10%, Calcium Fluoride (Fluorspan) 5%; Detect the initial phosphorus content 0.990% of pending molten iron, carbon content 4.20%.
Dephosphorizing process:
1) pig iron for preparing is weighed 200kg adds in the induction furnace beginning heat fused pig iron;
2) treat the molten clear back thermometric sampling of the pig iron, when temperature rises to 1360 ℃, be blown into oxygen from the furnace roof oxygen hose in the molten bath, add the dephosphorizing agent that is pre-mixed simultaneously in batches, first adds after 75%, 4 minute and adds remaining 25%; Wherein, selected dephosphorizing agent consumption is that 10% of pig iron weight is 20kg; The oxygen weight that is blown into is 3.00kg, and the volume of being converted under the standard state is 2.10m
3
3) continue heating dephosphorization end after 16 minutes.
Sampling detects after the dephosphorization treatment, and molten iron is phosphorous 0.201% after the dephosphorization treatment, and dephosphorization rate is 79.70%.Molten iron carbon containing 2.58% after the dephosphorization treatment, carbon-drop rate are 38.57%.
Claims (3)
1. molten iron dephosphorization agent, its each component percentage ratio is by weight counted: calcium oxide 75～85%, ferric oxide: 10～21%, Calcium Fluoride (Fluorspan) 4～5%.
2. the application method of the described molten iron dephosphorization agent of claim 1 may further comprise the steps successively:
1) pig iron for preparing is weighed back the adding in the induction furnace beginning heat fused pig iron;
2) treat the molten clear back thermometric sampling of the pig iron, when temperature rises to 1350 ± 10 ℃, in the molten bath, be blown into oxygen from the furnace roof oxygen hose, add the dephosphorizing agent that is pre-mixed simultaneously in batches, first adds 60～80% of total consumption, adds the residue dephosphorizing agent at interval behind 3～5min;
3) continue heating, dephosphorization finishes behind 12～18min;
It is characterized in that:
To phosphorus content is 0.2～0.5% medium-phosphorus hot metal, step 2) described dephosphorizing agent consumption is 8～10% of described pig iron weight, the described oxygen weight that is blown into is 1.5～3 times of the contained oxygen weight of ferric oxide in the described dephosphorizing agent; To phosphorus content is 0.5%～1% high phosphorus hot metal, step 2) described dephosphorizing agent consumption is 10～15% of described pig iron weight, the described oxygen weight that is blown into is 3～5 times of the contained oxygen weight of ferric oxide in the described dephosphorizing agent.
3. according to the application method of the described molten iron dephosphorization agent of claim, it is characterized in that: step 2) described in first dephosphorizing agent add after, add the residue dephosphorizing agent at interval behind 2.5～3.5min again.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104379772A (en) * | 2012-06-18 | 2015-02-25 | 杰富意钢铁株式会社 | Refining method and molten steel production method |
| CN104531934A (en) * | 2014-12-19 | 2015-04-22 | 昆明理工大学 | Dephosphorizing agent applied to high-phosphorus molten iron and application method of dephosphorizing agent |
| CN107312915A (en) * | 2017-08-30 | 2017-11-03 | 安徽省含山县潮林铸管厂（普通合伙） | A kind of method of iron casting dephosphorization |
| WO2018014752A1 (en) * | 2016-07-22 | 2018-01-25 | 唐山正丰钢铁有限公司 | Production process for dephosphorization outside of furnace of molten steel |
| CN108998616A (en) * | 2018-09-14 | 2018-12-14 | 山东国铭球墨铸管科技有限公司 | A kind of purification of the pig iron and its smelting process |
| CN111057818A (en) * | 2019-12-31 | 2020-04-24 | 永平县勇泰工业废渣有限公司 | Reductive dephosphorization agent and molten iron dephosphorization method |
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| CN101328528A (en) * | 2008-06-30 | 2008-12-24 | 鞍钢股份有限公司 | Core cabling wire for secondary refining dephosphorization to produce ultra-low phosphorus steel and preparation thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104379772A (en) * | 2012-06-18 | 2015-02-25 | 杰富意钢铁株式会社 | Refining method and molten steel production method |
| CN104379772B (en) * | 2012-06-18 | 2017-10-10 | 杰富意钢铁株式会社 | Method of refining and molten steel manufacture method |
| CN104531934A (en) * | 2014-12-19 | 2015-04-22 | 昆明理工大学 | Dephosphorizing agent applied to high-phosphorus molten iron and application method of dephosphorizing agent |
| WO2018014752A1 (en) * | 2016-07-22 | 2018-01-25 | 唐山正丰钢铁有限公司 | Production process for dephosphorization outside of furnace of molten steel |
| CN107312915A (en) * | 2017-08-30 | 2017-11-03 | 安徽省含山县潮林铸管厂（普通合伙） | A kind of method of iron casting dephosphorization |
| CN108998616A (en) * | 2018-09-14 | 2018-12-14 | 山东国铭球墨铸管科技有限公司 | A kind of purification of the pig iron and its smelting process |
| CN111057818A (en) * | 2019-12-31 | 2020-04-24 | 永平县勇泰工业废渣有限公司 | Reductive dephosphorization agent and molten iron dephosphorization method |
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