CN109112247A - Composite blowing iron melt desulfurizing agent and its sulfur removal technology - Google Patents
Composite blowing iron melt desulfurizing agent and its sulfur removal technology Download PDFInfo
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- CN109112247A CN109112247A CN201811237944.5A CN201811237944A CN109112247A CN 109112247 A CN109112247 A CN 109112247A CN 201811237944 A CN201811237944 A CN 201811237944A CN 109112247 A CN109112247 A CN 109112247A
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- China
- Prior art keywords
- lime
- desulfurizing agent
- passivated magnesium
- molten iron
- composite blowing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of composite blowing iron melt desulfurizing agent and its sulfur removal technology, desulfurizing agent includes passivated magnesium, lime and lime stone, and the passivated magnesium: lime: the mass ratio of lime stone is 1:2~8:1~4；Passivated magnesium particle diameter is 0.6~0.1mm；Lime granularity is 200~300 mesh；Limestone granularity is 300~400 mesh；Sulfur removal technology is to be blown into passivated magnesium, lime and lime stone into molten iron as desulfurizing agent to carry out desulfurizing iron；Passivated magnesium: lime: the mass ratio of lime stone is 1:2~8:1~4；Passivated magnesium particle diameter and gun insertion depth meet following relational expression: d=Y [6.75 × 10- 6h(1+0.625h)1/2]2/3, Y is pre-factor, and h is gun insertion depth, and d is passivated magnesium particle diameter.The present invention combines by using completely new desulfurizing agent and passes through the technological parameters such as optimization desulfurizing agent proportion, desulfurizing agent granularity, gun insertion depth, and the utilization rate of desulfurization degree and desulfurizing agent greatly improved, reduce desulphurization cost.
Description
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of composite blowing iron melt desulfurizing agent and its sulfur removal technology.
Background technique
Currently, desulfurizing iron mainly has: KR (mechanical stirring) desulfurization, singly-blowing magnesium grain desulfurization and composite blowing desulfurization.It is multiple
Closing blowing Desulphuring Process of Molten Iron is the Desulphuring Process of Molten Iron that development gets up in recent years, due to its flexibility, automation
Degree height is so be widely used in desulfurizing iron.Traditional composite blowing sulfur removal technology is mostly passivated magnesium-lime composite blowing
Desulfurization, essence is exactly that composite blowing enters molten iron from spray gun by a certain percentage with passivated magnesium, lime, anti-with the sulphur in molten iron
It answers, generates sulfide and float with desulfurization.Existing composite blowing desulfurization is primarily present following problems: 1) since magnesium enters iron liquid
Afterwards, the magnesium bubble diameter of formation is big, and ascent rate is fast, so utilization rate is low, causes the consumption of magnesium high；2) blowing desulfurization and stirring
Desulfurization is compared, and stirring power condition is insufficient, and desulfurizing agent is reacted with molten iron to be not enough, and causes desulfurization degree low；3) desulfurization effect
It is unstable, it is easy to appear the problem of desulfurization effect difference.
Summary of the invention
Present invention aim to provide a kind of composite blowing iron melt desulfurizing agent and its sulfur removal technology, the desulfurizing agent it is de- and
Its sulfur removal technology sulphur effect is good, and desulphurization cost is low.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of composite blowing iron melt desulfurizing agent, the desulfurization
Agent includes passivated magnesium, lime and lime stone, and the passivated magnesium: lime: the mass ratio of lime stone is 1:2~8:1~4；Passivated magnesium
Particle diameter is 0.6~0.1mm；Lime granularity is 200~300 mesh；Limestone granularity is 300~400 mesh.
Further, passivated magnesium: lime: the mass ratio of lime stone is 1:5:2.
A kind of composite blowing Desulphuring Process of Molten Iron, be blown into molten iron passivated magnesium, lime and lime stone as desulfurizing agent into
Row desulfurizing iron；Passivated magnesium: lime: the mass ratio of lime stone is 1:2~8:1~4；Passivated magnesium particle diameter and spray gun insertion are deep
Degree meets following relational expression: d=Y [6.75 × 10- 6h(1+0.625h)1/2]2/3, Y is pre-factor, value 0.8~1.2；H is
Gun insertion depth, unit m；D is passivated magnesium particle diameter, unit mm.
Further, passivated magnesium particle diameter is 0.6~0.1mm.
Further, lime granularity is 200~300 mesh.
Further, limestone granularity is 300~400 mesh.
Further, passivated magnesium: lime: the mass ratio of lime stone is 1:5:2.
Further, passivation magnesium granules are averaged jetting pressure as 350~390kpa.
Further, lime is averaged jetting pressure as 400~450kpa.
Further, lime stone is averaged jetting pressure as 400~450kpa.
Compared with prior art, the invention has the following advantages that
First, the present invention by using completely new composite desulfurizing agent and by optimization desulfurizing agent proportion, desulfurizing agent granularity,
The technological parameters such as gun insertion depth greatly improved the utilization rate of desulfurization degree and desulfurizing agent, reduce desulphurization cost.
Second, the lime stone that the present invention uses enters after iron liquid reaction of decomposing, decomposition of limestone reaction is utilized to generate
Tiny bubble can make to be formed the more disperse of magnesium bubble, diameter reduces, and ascent rate reduces, and increases stop of the magnesium in iron liquid
Time improves the utilization rate of magnesium, reduces sorbent consumption.
Third, blowing desulfurization, compared with stirring desulphurization, stirring power condition is insufficient, and desulfurizing agent is reacted with molten iron not enough to be filled
Point, cause desulfurization degree low；The lime stone that the present invention uses enters after iron liquid reaction of decomposing: 900 DEG C of decomposition temperature of limestone,
It into 1350 DEG C of iron liquids, can react rapidly, the CO of generation2Explosion reaction occurs, enhances the stirring power in hot-metal bottle
Condition keeps desulfurizing agent and reacting for iron liquid more abundant.
Fourth, in blowing passivated magnesium+lime+lime stone (Ca0+Mg+CaCO3) powder desulfurization when, three kinds of pulvis promote mutually
Into the progress of desulphurization reaction, CaO primarily serves the effect of dispersing agent and the nucleating center MgS, CaCO3Main function is to form many
Small and dispersed bubble reduces Mg bubble diameter, reduces ascent rate, increases its residence time in iron liquid, while agitation molten pool
Increase kinetic reaction condition.
Fifth, spray gun insertion level also has an impact to the utilization rate of desulfurizing agent, insertion depth is too deep to reduce tank bottom
Temperature causes tank bottom to go up, while lance outlet pressure also will increase, and leads to the production accidents such as stifled rifle；Insertion depth is excessively shallow, takes off
Sulphur agent also has little time dissolution and just floats into slag, leads to the waste of desulfurizing agent.The present invention by fitting magnesium grain diameter with it is critical
Insertion depth relationship properly solves this technical problem.
Sixth, conventional composite blowing sorbent consumption 0.3~0.6kg/t of passivated magnesium, 1.6~2kg/t of lime, initial sulphur
When content is 0.03%, desulfurization terminates mean content of sulfur and is down to 0.004%.Sorbent consumption is high, and desulfuration efficiency is low and unstable
It is fixed.Excavating technology of the present invention answers desulfurizing agent unit consumption: magnesium consumes 0.25kg/t molten iron, lime consumption 1.25kg/t molten iron, consumption of limestone
0.5kg/t molten iron, mean content of sulfur is down to 0.002%, minimum 0.001% after desulfurizing iron.Desulfurization greatly improved in the present invention
Agent utilization rate and desulfurization degree, reduce desulphurization cost.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, convenient for more clearly understanding the present invention,
But limiting the invention for they.
Embodiment 1
1) hot-metal bottle enters desulfurization position, molten iron charge weight 150t, and thermometric samples, and 1332 DEG C of initial temperature, initial sulfur content
0.032%；
2) desulfurization starts, and desulfurizing agent is blown into hot-metal bottle, and injecting velocity sets passivated magnesium 6kg/min, lime 30kg/
Min, lime stone 12kg/min, practical injecting velocity passivated magnesium 6.2kg/min, lime 32kg/min, lime stone 11.5kg/min；
Passivated magnesium particle diameter is 0.8mm, and lime granularity is 200 mesh, and limestone granularity is 400 mesh；Passivation magnesium granules are averagely blown pressure
Power is 370kpa, and lime is averaged jetting pressure as 420kpa.Lime stone is averaged jetting pressure as 420kpa；Gun insertion depth is
2.5m；
3) the blowing time 6 divides 15 seconds, and desulfurization terminates.
4) thermometric samples, and desulfurization terminates 1320 DEG C of temperature, terminates sulfur content 0.002%, sorbent consumption passivated magnesium
38.75kg, lime 200kg, lime stone 71.875kg.Unit consumption passivated magnesium 0.258kg/t, lime 1.33kg/t, lime stone
0.48kg/t。
Embodiment 2
1) hot-metal bottle enters desulfurization position, molten iron charge weight 148t, and thermometric samples, and 1346 DEG C of initial temperature, initial sulfur content
0.030%；
2) desulfurization starts, and desulfurizing agent is blown into hot-metal bottle, and injecting velocity sets passivated magnesium 6kg/min, lime 30kg/
Min, lime stone 12kg/min, practical injecting velocity passivated magnesium 6.1kg/min, lime 29kg/min, lime stone 12kg/min；It is blunt
Change magnesium granules diameter is 0.6mm, and lime granularity is 300 mesh, and limestone granularity is 400 mesh；Passivation magnesium granules are averaged jetting pressure
For 380kpa, lime is averaged jetting pressure as 420kpa.Lime stone is averaged jetting pressure as 430kpa；Gun insertion depth is
2.3m；
3) the blowing time 6 divides, and desulfurization terminates.
4) thermometric samples, and desulfurization terminates 1333 DEG C of temperature, terminates sulfur content 0.001%, sorbent consumption passivated magnesium
36.6kg, lime 174kg, lime stone 72kg.Unit consumption passivated magnesium 0.247kg/t, lime 1.176kg/t, lime stone 0.486kg/
t。
Claims (10)
1. a kind of composite blowing iron melt desulfurizing agent, it is characterised in that: the desulfurizing agent includes passivated magnesium, lime and lime stone, institute
State passivated magnesium: lime: the mass ratio of lime stone is 1:2~8:1~4；Passivated magnesium particle diameter is 0.6~0.1mm；Lime granularity
For 200~300 mesh；Limestone granularity is 300~400 mesh.
2. composite blowing iron melt desulfurizing agent according to claim 1, it is characterised in that: passivated magnesium: lime: the quality of lime stone
Than for 1:5:2.
3. a kind of composite blowing Desulphuring Process of Molten Iron, it is characterised in that: be blown into passivated magnesium, lime and lime stone conduct into molten iron
Desulfurizing agent carries out desulfurizing iron；Passivated magnesium: lime: the mass ratio of lime stone is 1:2~8:1~4；Passivated magnesium particle diameter and spray
Rifle insertion depth meets following relational expression: d=Y [6.75 × 10- 6h(1+0.625h)1/2]2/3, Y is pre-factor, value 0.8
~1.2；H is gun insertion depth, unit m；D is passivated magnesium particle diameter, unit mm.
4. composite blowing Desulphuring Process of Molten Iron according to claim 3, it is characterised in that: passivated magnesium particle diameter be 0.6~
0.1mm。
5. composite blowing Desulphuring Process of Molten Iron according to claim 3, it is characterised in that: lime granularity is 200~300 mesh.
6. composite blowing Desulphuring Process of Molten Iron according to claim 3, it is characterised in that: limestone granularity is 300~400
Mesh.
7. the composite blowing Desulphuring Process of Molten Iron according to any one of claim 3 to 6, it is characterised in that: passivated magnesium: stone
Ash: the mass ratio of lime stone is 1:5:2.
8. the composite blowing Desulphuring Process of Molten Iron according to any one of claim 3 to 6, it is characterised in that: passivation magnesium granules
Average jetting pressure is 350~390kpa.
9. the composite blowing Desulphuring Process of Molten Iron according to any one of claim 3 to 6, it is characterised in that: lime averagely sprays
Blow pressure power is 400~450kpa.
10. the composite blowing Desulphuring Process of Molten Iron according to any one of claim 3 to 6, it is characterised in that: lime stone is average
Jetting pressure is 400~450kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237944.5A CN109112247A (en) | 2018-10-23 | 2018-10-23 | Composite blowing iron melt desulfurizing agent and its sulfur removal technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237944.5A CN109112247A (en) | 2018-10-23 | 2018-10-23 | Composite blowing iron melt desulfurizing agent and its sulfur removal technology |
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|---|---|
| CN109112247A true CN109112247A (en) | 2019-01-01 |
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| CN201811237944.5A Pending CN109112247A (en) | 2018-10-23 | 2018-10-23 | Composite blowing iron melt desulfurizing agent and its sulfur removal technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111876556A (en) * | 2020-06-23 | 2020-11-03 | 邯郸钢铁集团有限责任公司 | Process control method for improving desulfurization efficiency of calcium-magnesium composite blowing molten iron |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139369A (en) * | 1976-09-17 | 1979-02-13 | Hoechst Aktiengesellschaft | Desulphurization of an iron melt |
| JPH05140626A (en) * | 1991-11-18 | 1993-06-08 | Kawasaki Steel Corp | Method for pretreating molten iron |
| CN101532070A (en) * | 2009-03-26 | 2009-09-16 | 方克明 | Steel fusant desulfurizer |
| CN104032061A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten iron desulfurizing agent and molten iron desulfurization method |
-
2018
- 2018-10-23 CN CN201811237944.5A patent/CN109112247A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139369A (en) * | 1976-09-17 | 1979-02-13 | Hoechst Aktiengesellschaft | Desulphurization of an iron melt |
| JPH05140626A (en) * | 1991-11-18 | 1993-06-08 | Kawasaki Steel Corp | Method for pretreating molten iron |
| CN101532070A (en) * | 2009-03-26 | 2009-09-16 | 方克明 | Steel fusant desulfurizer |
| CN104032061A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten iron desulfurizing agent and molten iron desulfurization method |
Non-Patent Citations (1)
| Title |
|---|
| 孙伟 等: "钝化镁-石灰复合喷吹脱硫工艺优化试验", 《炼钢》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111876556A (en) * | 2020-06-23 | 2020-11-03 | 邯郸钢铁集团有限责任公司 | Process control method for improving desulfurization efficiency of calcium-magnesium composite blowing molten iron |
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