CN102268505A - Method for pre-desulfuration of molten iron in foundry ladle - Google Patents
Method for pre-desulfuration of molten iron in foundry ladle Download PDFInfo
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- CN102268505A CN102268505A CN2011102220888A CN201110222088A CN102268505A CN 102268505 A CN102268505 A CN 102268505A CN 2011102220888 A CN2011102220888 A CN 2011102220888A CN 201110222088 A CN201110222088 A CN 201110222088A CN 102268505 A CN102268505 A CN 102268505A
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Abstract
The invention provides a method for pre-desulfuration of molten iron in a foundry ladle, belonging to the technical field of metallurgy. The method comprises the following steps: smashing a mixture of a calcium carbide powder and an alkali metal material so as to prepare a desulfurizing agent; and when the molten iron is smelted, jetting the desulfurizing agent to a bath in the foundry ladle through a dusting device at the bottom of the foundry ladle, wherein the jetting amount of the desulfurizing agent is 1-4kg per ton of molten iron, and the jetting strength of nitrogen is 0.06-0.1Nm<3>/min per ton of molten iron. The method in the invention is low in cost, is simple in manipulation, is easy to achieve and is stable to operate, and has high desulfuration rate and good industrial practical prospect.
Description
Technical field
The invention belongs to metallurgical technology field, the method for molten iron pre-desulfurization in particularly a kind of hot metal ladle.
Background technology
Hot metal pretreatment technology was risen the seventies in 20th century, and initial stage of development only is used for producing as avoiding the offscale remedial measures of hot metal composition occurring; Hot metal pretreatment is to improve the steel products quality, enlarges rolling shapes, and the important process means that reduce cost were at home and abroad developed rapidly in recent years, and wherein desulfurizing iron is the most common and most important hot metal pretreatment technology.
Desulfurizing iron is meant the desulfurization processing before molten iron enters steel melting furnace, and it is a technology full-fledged at first in the hot metal pretreatment, produce low-sulfur steel ([S]＜0.01%) and ultralow-sulfur steel ([S]＜0.005%), must adopt molten iron pre-desulfurization technology.
Desulfurizing iron mainly can be divided into mechanical mixing method desulfurization (KR) and two kinds of methods of top powder injection process desulfurization by sulfur removal technology at present.
The KR paddling process is that Japanese Nippon Steel is used for industrial external desulfurization of hot metal technology in nineteen sixty-five, this sulfur method is the agitator immersion iron ladle internal rotation stirring molten iron with a kind of outer lining refractories, make molten iron produce whirlpool, add sweetening agent simultaneously and make it be involved in molten iron inside fully to react, thereby reach the purpose of desulfurizing iron; Characteristics such as this method has the desulfuration efficiency height, the sweetening agent consumption is few and metal loss is low; But that the disadvantage of this method is a hot metal temperature drop is big, investment is high, must take off clean slag before the desulfurization.
Blowing process is that sweetening agent is blown into the molten iron deep with carrier gas through spray gun, and pulvis is fully contacted with molten iron, in floating-upward process with removal of sulphur; Blowing process mainly contains torpedo tank car top blowing process desulfurizing iron and molten iron tank deck blowing desulfurization, characteristics such as this method has the desulfuration efficiency height, the sweetening agent consumption is few and hot metal temperature drop is lower; But have that the splash phenomenon is serious, shortcomings such as metal loss is big, spray gun pollution metal liquid, long processing period, temperature drop is big, investment is high, secondary oxidation and suction nitrogen are serious.
Summary of the invention
At the problem of the existing technical existence of molten iron pre-desulfurization, the invention provides the method for molten iron pre-desulfurization in a kind of hot metal ladle.
Method of the present invention is:
1, the mixture flour of calcium carbide powder and alkali metal compound is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and alkali metal compound is calcium carbide powder: alkali metal compound=1:(0 ~ 4 by weight); Described alkali metal compound is selected one or more the mixture in unslaked lime, Wingdale, wagnerite, unprocessed dolomite, slaked lime, brucite and the digestion rhombspar for use;
When 2, the molten iron in the hot metal ladle being smelted, with nitrogen is carrier gas, dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, and the winding-up amount of sweetening agent is 1 ~ 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.06 ~ 0.1Nm per ton
3/ min.
Dusting device in the aforesaid method bottom the hot metal ladle comprises powder spraying pot, dust gas permeable brick and connecting tube, and the slit width of the gas permeable brick that wherein dusts is 0.15 ~ 0.22mm.
The composition of above-mentioned molten iron contains C3.5 ~ 4.5% by weight percentage, Si0.13 ~ 0.6%, and Mn0.2 ~ 0.85%, P≤0.08%, S0.03 ~ 0.05%, surplus is Fe.
The composition of molten iron in the aforesaid method after pre-desulfurization contains C3.5 ~ 4.5% by weight percentage, Si0.13 ~ 0.6%, and Mn0.2 ~ 0.85%, P≤0.08%, S0.005 ~ 0.04%, surplus is Fe.
The principle of the inventive method is to adopt to jet than the mixture of the calcium carbide powder of small particle size or calcium carbide powder and alkali metal compound to carry out pre-desulfurization in the hot metal ladle bath, and owing to particle is thin, specific surface area is big, has increased reaction interface, the desulfurization degree height; Alkali metal compound can also promote the diffusion of calcium carbide powder, and the easy come-up of having avoided adopting top to add the sweetening agent method enters in the slag, thereby reduces the shortcoming of desulfurization degree; The employing gas permeable brick that dusts is jetted, and can avoid stopping up or the molten metal phenomenon of osmosis, also is convenient to the safety in production and the handling of hot metal ladle, has good security and reliability.
Method cost of the present invention is low, simple to operate, realizes easily, and stable, the desulfurization degree height has the practical prospect of favorable industrial.
Embodiment
The calcium carbide powder of selecting for use in the embodiment of the invention is the general industry product, requires the gas forming amount of calcium carbide powder under 20 ℃ of temperature and air pressure 101.3kPa condition to be at least 280L/kg.
The unslaked lime that adopts in the embodiment of the invention, Wingdale, wagnerite, unprocessed dolomite, slaked lime, brucite and digestion rhombspar are the general industry product.
It is the disclosed a kind of gas permeable brick that is used for end powder injection process of Chinese patent application of ZL2005201458206 that gas permeable brick in the embodiment of the invention is selected application number for use.
The desulfurization degree of molten iron after pre-desulfurization is 20 ~ 85% in the embodiment of the invention.
Embodiment 1
The composition of molten iron contains C3.7% by weight percentage, Si0.13%, and Mn0.25%, P0.06%, S0.05%, surplus is Fe;
The dusting device of hot metal ladle bottom comprises powder spraying pot, dust gas permeable brick and connecting tube, and the slit width of the gas permeable brick that wherein dusts is 0.15mm;
Calcium carbide powder is crushed to particle diameter≤0.04mm makes sweetening agent;
Adopt the 15t converter, when the molten iron in the hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 1kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.06Nm per ton
3/ min;
The composition of molten iron after pre-desulfurization contains C3.7% by weight percentage, Si0.13%, and Mn0.25%, P0.06%, S0.04%, surplus is Fe;
The desulfurization degree of molten iron after pre-desulfurization is 20wt%.
Embodiment 2
The composition of molten iron contains C3.9% by weight percentage, Si0.25%, and Mn0.45%, P0.06%, S0.04%, surplus is Fe;
The dusting device of hot metal ladle bottom comprises powder spraying pot, dust gas permeable brick and connecting tube, and the slit width of the gas permeable brick that wherein dusts is 0.18mm;
Calcium carbide powder is crushed to particle diameter≤0.04mm makes sweetening agent;
Adopt the 30t converter, when the molten iron in the hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 2kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.07Nm per ton
3/ min;
The composition of molten iron after pre-desulfurization contains C3.9% by weight percentage, Si0.25%, and Mn0.45%, P0.06%, S0.03%, surplus is Fe;
The desulfurization degree of molten iron after pre-desulfurization is 25wt%.
Embodiment 3
The composition of molten iron contains C4.2% by weight percentage, Si0.55%, and Mn0.75%, P0.05%, S0.04%, surplus is Fe;
The dusting device of hot metal ladle bottom comprises powder spraying pot, dust gas permeable brick and connecting tube, and the slit width of the gas permeable brick that wherein dusts is 0.18mm;
Calcium carbide powder is crushed to particle diameter≤0.04mm makes sweetening agent;
Adopt the 45t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 3kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.08Nm per ton
3/ min;
The composition of molten iron after pre-desulfurization contains C4.2% by weight percentage, Si0.55%, and Mn0.75%, P0.05%, S0.01%, surplus is Fe;
The desulfurization degree of molten iron after pre-desulfurization is 75wt%.
Embodiment 4
The composition of molten iron contains C4.4% by weight percentage, Si0.6%, and Mn0.83%, P0.05%, S0.03%, surplus is Fe;
The alkali metal compound that adopts is a Wingdale;
The dusting device of hot metal ladle bottom comprises powder spraying pot, dust gas permeable brick and connecting tube, and the slit width of the gas permeable brick that wherein dusts is 0.22mm;
The mixture flour of calcium carbide powder and Wingdale is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and Wingdale is calcium carbide powder: Wingdale=1:0.1 by weight;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The composition of molten iron after pre-desulfurization contains C4.4% by weight percentage, Si0.6%, and Mn0.85%, P0.05%, S0.005%, surplus is Fe;
The desulfurization degree of molten iron after pre-desulfurization is 83.3wt%.
Embodiment 5
The composition of molten iron is with embodiment 1;
Dust the slit width of gas permeable brick with embodiment 1;
The alkali metal compound that adopts is a wagnerite;
The mixture flour of calcium carbide powder and wagnerite is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and wagnerite is calcium carbide powder: wagnerite=1:0.4 by weight;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 60wt%.
Embodiment 6
The composition of molten iron is with embodiment 2;
Dust the slit width of gas permeable brick with embodiment 1;
The alkali metal compound that adopts is a unprocessed dolomite;
The mixture flour of calcium carbide powder and unprocessed dolomite is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and unprocessed dolomite is calcium carbide powder: unprocessed dolomite=1:0.8 by weight;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 50wt%.
Embodiment 7
The composition of molten iron is with embodiment 3;
Dust the slit width of gas permeable brick with embodiment 3;
The alkali metal compound that adopts is a slaked lime;
The mixture flour of calcium carbide powder and slaked lime is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and slaked lime is calcium carbide powder: slaked lime=1:1 by weight;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 75wt%.
Embodiment 8
The composition of molten iron is with embodiment 4;
Dust the slit width of gas permeable brick with embodiment 4;
The alkali metal compound that adopts is a brucite;
The mixture flour of calcium carbide powder and brucite is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and brucite is calcium carbide powder: brucite=1:2 by weight;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 80wt%.
Embodiment 9
The composition of molten iron is with embodiment 1;
Dust the slit width of gas permeable brick with embodiment 3;
The alkali metal compound that adopts is the digestion rhombspar;
The calcium carbide powder and the mixture flour of digestion rhombspar are made sweetening agent to particle diameter≤0.04mm; Wherein calcium carbide powder is a calcium carbide powder with the blending ratio of the mixture of digestion rhombspar by weight: digestion rhombspar=1:3;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 60wt%.
Embodiment 10
The composition of molten iron is with embodiment 2;
Dust the slit width of gas permeable brick with embodiment 2;
The mixture flour of calcium carbide powder and alkali metal compound is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and alkali metal compound is calcium carbide powder: alkali metal compound=1:4 by weight; Described alkali metal compound be Wingdale, wagnerite, unprocessed dolomite, slaked lime, brucite and unslaked lime etc. the quality mixture;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 75wt%.
Embodiment 11
The composition of molten iron is with embodiment 3;
Dust the slit width of gas permeable brick with embodiment 3;
The mixture flour of calcium carbide powder and alkali metal compound is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and alkali metal compound is calcium carbide powder: alkali metal compound=1:2 by weight; Described alkali metal compound be Wingdale, unprocessed dolomite and slaked lime etc. the quality mixture;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 75wt%.
Embodiment 12
The composition of molten iron is with embodiment 4;
Dust the slit width of gas permeable brick with embodiment 4;
The mixture flour of calcium carbide powder and alkali metal compound is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and alkali metal compound is calcium carbide powder: alkali metal compound=1:1 by weight; Described alkali metal compound be in wagnerite, brucite and the digestion rhombspar etc. the quality mixture;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 80wt%.
Embodiment 13
The composition of molten iron is with embodiment 1;
Dust the slit width of gas permeable brick with embodiment 1;
The alkali metal compound that adopts is a unslaked lime;
The mixture flour of calcium carbide powder and unslaked lime is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and unslaked lime is calcium carbide powder: unslaked lime=1:2 by weight;
Adopt the 60t converter, when the molten iron in hot metal ladle is smelted, be carrier gas with nitrogen, the dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, the winding-up amount of sweetening agent is the 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.1Nm per ton
3/ min;
The desulfurization degree of molten iron after pre-desulfurization is 60wt%.
Claims (2)
1. the method for molten iron pre-desulfurization in the hot metal ladle is characterized in that carrying out according to the following steps:
(1) the mixture flour of calcium carbide powder and alkali metal compound is made sweetening agent to particle diameter≤0.04mm; Wherein the blending ratio of the mixture of calcium carbide powder and alkali metal compound is calcium carbide powder: alkali metal compound=1:(0 ~ 4 by weight); Described alkali metal compound is selected one or more the mixture in unslaked lime, Wingdale, wagnerite, unprocessed dolomite, slaked lime, brucite and the digestion rhombspar for use;
When (2) molten iron in the hot metal ladle being smelted, with nitrogen is carrier gas, dusting device by hot metal ladle bottom is jetted sweetening agent in the bath in hot metal ladle, and the winding-up amount of sweetening agent is 1 ~ 4kg/t molten iron, and the winding-up intensity of nitrogen is by molten iron winding-up 0.06 ~ 0.1Nm per ton
3/ min.
2. the method for molten iron pre-desulfurization in a kind of hot metal ladle according to claim 1 is characterized in that the slit width of the gas permeable brick that dusts of the dusting device of hot metal ladle bottom is 0.15 ~ 0.22mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011102220888A CN102268505A (en) | 2011-08-04 | 2011-08-04 | Method for pre-desulfuration of molten iron in foundry ladle |
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| CN2011102220888A CN102268505A (en) | 2011-08-04 | 2011-08-04 | Method for pre-desulfuration of molten iron in foundry ladle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107828931A (en) * | 2017-11-02 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of blowing process molten iron pre-desulfurization technique for not having to fluidization lime and passivated magnesium |
| CN109338037A (en) * | 2018-11-22 | 2019-02-15 | 中冶南方工程技术有限公司 | The method for obtaining the safety blowing intensity of molten iron pretreatment blowing gas |
| 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 |
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| CN1477213A (en) * | 2003-06-05 | 2004-02-25 | 范玉全 | Compound desulfurizing agent for molten iron |
| CN2850763Y (en) * | 2005-12-19 | 2006-12-27 | 沈阳东北大学冶金技术研究所 | Air-permeable brick for bottom powder-applying process |
| CN1986840A (en) * | 2006-11-24 | 2007-06-27 | 周建安 | Molten steel desulfurizing process of bottom blowing superfine magnesium powder |
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2011
- 2011-08-04 CN CN2011102220888A patent/CN102268505A/en active Pending
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| CN1477213A (en) * | 2003-06-05 | 2004-02-25 | 范玉全 | Compound desulfurizing agent for molten iron |
| CN2850763Y (en) * | 2005-12-19 | 2006-12-27 | 沈阳东北大学冶金技术研究所 | Air-permeable brick for bottom powder-applying process |
| CN1986840A (en) * | 2006-11-24 | 2007-06-27 | 周建安 | Molten steel desulfurizing process of bottom blowing superfine magnesium powder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107828931A (en) * | 2017-11-02 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of blowing process molten iron pre-desulfurization technique for not having to fluidization lime and passivated magnesium |
| CN109338037A (en) * | 2018-11-22 | 2019-02-15 | 中冶南方工程技术有限公司 | The method for obtaining the safety blowing intensity of molten iron pretreatment blowing gas |
| CN109338037B (en) * | 2018-11-22 | 2020-06-19 | 中冶南方工程技术有限公司 | Method for obtaining safe injection strength of molten iron pretreatment injection gas |
| 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 |
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Application publication date: 20111207 |