CN106381358A - Method for smelting high-phosphorus steel from semisteel - Google Patents
Method for smelting high-phosphorus steel from semisteel Download PDFInfo
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- CN106381358A CN106381358A CN201610999504.8A CN201610999504A CN106381358A CN 106381358 A CN106381358 A CN 106381358A CN 201610999504 A CN201610999504 A CN 201610999504A CN 106381358 A CN106381358 A CN 106381358A
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- steel
- semisteel
- iron ore
- smelting high
- phosphorus iron
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention belongs to the field of steel smelting to obtain metal and particularly relates to a method for smelting high-phosphorus steel from semisteel. The method comprises the steps of 1, controlling constituents of the molten semisteel and weight percentages of the constituents, wherein the molten semisteel comprises, by weight percentage, 3.2-4.1% of C, 0.015-0.030% of Si, 0.02-0.04% of Mn, 0.06-0.08% of P and less than or equal to 0.015% of S; 2, controlling the charging temperature of the semisteel to range from 1300 DEG C to 1360 DEG C; and 3, after smelting and oxygen blowing are conducted for two minutes, adding active lime, high-magnesium lime and a slag forming agent, blowing oxygen through the low-gun-position and high flow at the later stage of oxygen blowing, and discharging the steel at the temperature of 1650-1700 DEG C. By means of the method for smelting the high-phosphorus steel from the semisteel, compared with traditional smelting methods, consumption of auxiliary materials and ferrophosphorus can be effectively lowered, and it is predicted that cost of each ton of steel can be lowered by five yuan.
Description
Technical field
The invention belongs to smelting iron and steel metal field is and in particular to a kind of method of semisteel smelting high-phosphorus iron ore.
Background technology
Phosphorus is with Fe in steel3P or Fe2P-shaped formula exists.The dephosphorisation reaction of steelmaking process is at molten metal and slag interface
Carry out, be that P is oxidized to P first2O5, then it is combined into stable calcium phosphate with CaO.The principal element of impact dephosphorization is molten
The composition of pond temperature, slag composition and molten metal.
Dephosphorisation reaction is strong exothermal reaction, and temperature reduces, and from thermodynamic consideration, low temperature dephosphorization is than advantageous.Slag composition
Impact be mainly shown as the impact of basicity of slag and slag beneficiation.P2O5Belong to acidic oxide, the alkalescence oxygen such as CaO, MgO
Compound can reduce its activity, and basicity is higher, and in slag, effective w (CaO) is higher, and dephosphorization is more complete.Be conducive to the condition of dephosphorization
It is：High alkalinity, high oxidative, good flow row slag, the agitation of sufficient molten bath, suitable temperature and the big quantity of slag.
Existing smelting phosphor-containing steel mainly phosphorous 0.025%～0.100%, existing semi-steel making converter dephosphorization is extremely
0.010%～0.015%--LF-RH (interpolation ferrophosphorus), needs plus more adjuvant and ferrophosphorus, the shortcomings of have relatively costly.
As Publication No. " CN104109727A ", invention entitled " method of half steel converter smelting Low-phosphorus Steel "；Publication number
For " CN104060018A ", invention entitled " a kind of method of low phosphorus steel by smelting semisteel "；Publication No. " CN101696462A ",
Invention entitled " a kind of method of low phosphorus steel by smelting semisteel " etc., is all intended to reduce phosphorus content in steel, needs to add more
Slag making materials, makes in steel phosphorus content be less than 0.005%, and some processes are when controlling half steel hot metal composition, need to add Ti,
The metals such as V, relatively costly.
Content of the invention
The technical problem to be solved is a kind of method providing semisteel smelting of low cost to obtain high-phosphorus iron ore.
The method of semisteel smelting high-phosphorus iron ore, comprises the following steps：
A, control half steel hot metal composition and its percentage by weight are：C 3.2～4.1%, Si 0.015～0.030%, Mn
0.02～0.04%, P 0.06～0.08%, S≤0.015%；
B, control half steel charging temperature are 1300～1360 DEG C；
After c, smelting oxygen blast 2min, add active lime, dolomitic lime and slag former, the oxygen blast later stage adopts the big stream of low rifle position
Amount oxygen blast, taps when 1650～1700 DEG C；
Wherein, active lime addition is 3.5～4.5kg/t steel, and dolomitic lime addition is 3.5～4.5kg/t steel, makes
Slag agent addition is 7～11kg/t steel；
For rifle position away from molten steel face 1.2～1.49m, the oxygen blown oxygen flow of big flow is 40000～45000m to low rifle position3/
h；
During tapping, molten steel C content is 0.01～0.02%, and P content is 0.035～0.045%.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, controls half steel hot metal composition and its weight wherein in a step
Percentage ratio is：C 3.8%, Si 0.020%, Mn 0.03%, P 0.07%, S≤0.010%.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, controls half steel charging temperature to be 1340 wherein in b step
DEG C, converter dress half steel amount is 130 tons.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, wherein in step c, active lime addition is 4.0kg/t
Steel, dolomitic lime addition is 4.0kg/t steel, and slag former addition is 9kg/t steel.
The method of above-mentioned semisteel smelting high-phosphorus iron ore, contains CaO 85～90wt% in wherein said active lime.
The method of above-mentioned semisteel smelting high-phosphorus iron ore, contains CaO 48～55wt%, MgO 30 in wherein said dolomitic lime
～40wt%.
The method of above-mentioned semisteel smelting high-phosphorus iron ore, contains SiO in wherein said slag former245～48wt%, MgO 3～
7wt%, CaO 3～5wt%, TFe ＞ 12wt%, MnO 3～8wt%, P ＜ 0.1wt%, S ＜ 0.1wt%.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, wherein in step c, low rifle position is rifle position away from molten steel face
1.35m, the oxygen blown oxygen flow of big flow is 43000m3/h.
The method of semisteel smelting high-phosphorus iron ore of the present invention, more traditional smelt phosphor-containing steel method, can effectively reduce adjuvant and
Ferrophosphorus consumption, it is contemplated that ton steel cost can reduce by 5 yuan, by long-term for the method large-scale production, can effectively reduce and produce into
This, be that enterprise brings larger profit.
Specific embodiment
The method of semisteel smelting high-phosphorus iron ore, comprises the following steps：
Half steel water after a, control vanadium extraction meets vanadium extraction and requires, and its composition and its percentage by weight are：C 3.2～
4.1%, Si 0.015～0.030%, Mn 0.02～0.04%, P 0.06～0.08%, S≤0.015%；
B, control half steel charging temperature are 1300～1360 DEG C, if vessel dimensions are certain, are closed according to economy, safety
Reason arranges charge weight, and according to climbing the steel condition of production, its converter dress half steel amount is generally 125～145 tons；
C, for good slugging, after smelting oxygen blast 2min, add active lime, dolomitic lime and slag former, oxygen blast
Later stage adopts low rifle position big flow oxygen blast, taps when 1650～1700 DEG C；The oxygen blast later stage of the present invention specifically refers to half steel
When smelting progress reaches 2/3；
Wherein, active lime addition is 3.5～4.5kg/t steel, and dolomitic lime addition is 3.5～4.5kg/t steel, makes
Slag agent addition is 7～11kg/t steel；
For rifle position away from molten steel face 1.2～1.49m, the oxygen blown oxygen flow of big flow is 40000～45000m to low rifle position3/
h；
Tap in low-carbon (LC) amount, during tapping, molten steel C content is 0.01～0.02%, P content is 0.035～0.045%.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, controls half steel hot metal composition and its weight wherein in a step
Percentage ratio is：C 3.8%, Si 0.020%, Mn 0.03%, P 0.07%, S≤0.010%.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, controls half steel charging temperature to be 1340 wherein in b step
DEG C, converter dress half steel amount is 130 tons.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, wherein in step c, active lime addition is 4.0kg/t
Steel, dolomitic lime addition is 4.0kg/t steel, and slag former addition is 9kg/t steel.
The method of above-mentioned semisteel smelting high-phosphorus iron ore, contains CaO 85～90wt% in wherein said active lime.
The method of above-mentioned semisteel smelting high-phosphorus iron ore, contains CaO 48～55wt%, MgO 30 in wherein said dolomitic lime
～40wt%.
The method of above-mentioned semisteel smelting high-phosphorus iron ore, contains SiO in wherein said slag former245～48wt%, MgO 3～
7wt%, CaO 3～5wt%, TFe ＞ 12wt%, MnO 3～8wt%, P ＜ 0.1wt%, S ＜ 0.1wt%.
Further, the method for above-mentioned semisteel smelting high-phosphorus iron ore, wherein in step c, low rifle position is rifle position away from molten steel face
1.35m, the oxygen blown oxygen flow of big flow is 43000m3/h.
With reference to embodiment, the specific embodiment of the present invention is further described, therefore the present invention is not limited
System is among described scope of embodiments.
Embodiment 1
The 200t converter of certain factory adopts semi-steel making, controls half steel condition according in table 1, experimental group 1～5 is to adopt the present invention
Method controls half steel hot metal composition, half steel charging temperature and half steel useful load, and design parameter is shown in Table 1：
Table 1 semisteel smelting condition
1～5 group of experimental group is after smelting oxygen blast 2min, adds active lime, dolomitic lime and slag former, experimental group 1
～5 groups adopt low rifle position big flow oxygen blast in the oxygen blast later stage, and rifle position away from molten steel face 1.2～1.49m, oxygen blown oxygen flow is
40000～45000m3/ h, taps when 1650～1700 DEG C；Concrete smelting process is shown in Table 2：
The technological parameter of table 2 semisteel smelting high-phosphorus iron ore
The present invention adopts low-carbon (LC) to tap, and tapping carbon content is 0.01～0.02%, using semisteel smelting high-phosphorus iron ore of the present invention
Method after tapping phosphorus content be controlled to 0.035～0.045%, improve converter tapping phosphorus content, relatively normal smelt tapping phosphorus
Content 0.010～0.015% can increase by more than 0.028%, not only can greatly reduce ferrophosphorus and supplementary product onsumption, and steel per ton
Cost can reduce at least 5 yuan, has larger economic benefit and application prospect.
Claims (8)
1. the method for semisteel smelting high-phosphorus iron ore is it is characterised in that comprise the following steps：
A, control half steel hot metal composition and its percentage by weight are：C 3.2～4.1%, Si 0.015～0.030%, Mn 0.02
～0.04%, P 0.06～0.08%, S≤0.015%；
B, control half steel charging temperature are 1300～1360 DEG C；
After c, smelting oxygen blast 2min, add active lime, dolomitic lime and slag former, the oxygen blast later stage is blown using low rifle position big flow
Oxygen, taps when 1650～1700 DEG C；
Wherein, active lime addition is 3.5～4.5kg/t steel, and dolomitic lime addition is 3.5～4.5kg/t steel, slag former
Addition is 7～11kg/t steel；
Low rifle position refers to rifle position away from molten steel face 1.2～1.49m, and the oxygen blown oxygen flow of big flow is 40000～45000m3/h；
During tapping, molten steel C content is 0.01～0.02%, and P content is 0.035～0.045%.
2. according to claim 1 semisteel smelting high-phosphorus iron ore method it is characterised in that：Half steel water is controlled to become in a step
Divide and its percentage by weight is：C 3.8%, Si 0.020%, Mn 0.03%, P 0.07%, S≤0.010%.
3. according to claim 1 semisteel smelting high-phosphorus iron ore method it is characterised in that：Half steel is controlled to enter furnace temperature in b step
Spend for 1340 DEG C, converter dress half steel amount is 130 tons.
4. according to claim 1 semisteel smelting high-phosphorus iron ore method it is characterised in that：Active lime addition in step c
For 4.0kg/t steel, dolomitic lime addition is 4.0kg/t steel, and slag former addition is 9kg/t steel.
5. according to claim 1 or 4 semisteel smelting high-phosphorus iron ore method it is characterised in that：Contain in described active lime
CaO 85～90wt%.
6. according to claim 1 or 4 semisteel smelting high-phosphorus iron ore method it is characterised in that：Contain in described dolomitic lime
CaO 48～55wt%, MgO 30～40wt%.
7. according to claim 1 or 4 semisteel smelting high-phosphorus iron ore method it is characterised in that：SiO is contained in described slag former2
45～48wt%, MgO 3～7wt%, CaO 3～5wt%, TFe ＞ 12wt%, MnO 3～8wt%, P ＜ 0.1wt%, S ＜
0.1wt%.
8. according to claim 1 semisteel smelting high-phosphorus iron ore method it is characterised in that：In step c low rifle position be rifle position away from
Molten steel face 1.35m, the oxygen blown oxygen flow of big flow is 43000m3/h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610999504.8A CN106381358B (en) | 2016-11-14 | 2016-11-14 | The method of semisteel smelting high-phosphorus iron ore |
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|---|---|---|---|
| CN201610999504.8A CN106381358B (en) | 2016-11-14 | 2016-11-14 | The method of semisteel smelting high-phosphorus iron ore |
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| CN106381358A true CN106381358A (en) | 2017-02-08 |
| CN106381358B CN106381358B (en) | 2018-05-01 |
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Citations (6)
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| CN102260822A (en) * | 2011-07-27 | 2011-11-30 | 攀钢集团有限公司 | High-phosphorus low-sulfur non-oriented electrical steel and smelting method thereof |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN102876830A (en) * | 2011-07-15 | 2013-01-16 | 武汉钢铁(集团)公司 | Converter smelting method for high-phosphorus steel for containers |
| CN103131817A (en) * | 2011-11-30 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Converter steelmaking phosphorus reservation smelting method |
| CN103773916A (en) * | 2014-01-23 | 2014-05-07 | 首钢总公司 | Method for smelting weather resistant steel through high-phosphorus-content steel discharging by converter |
| CN106086286A (en) * | 2016-08-02 | 2016-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-bearing hot metal smelts the method controlling steelmaking converter tapping phosphorus content |
-
2016
- 2016-11-14 CN CN201610999504.8A patent/CN106381358B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876830A (en) * | 2011-07-15 | 2013-01-16 | 武汉钢铁(集团)公司 | Converter smelting method for high-phosphorus steel for containers |
| CN102260822A (en) * | 2011-07-27 | 2011-11-30 | 攀钢集团有限公司 | High-phosphorus low-sulfur non-oriented electrical steel and smelting method thereof |
| CN103131817A (en) * | 2011-11-30 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Converter steelmaking phosphorus reservation smelting method |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN103773916A (en) * | 2014-01-23 | 2014-05-07 | 首钢总公司 | Method for smelting weather resistant steel through high-phosphorus-content steel discharging by converter |
| CN106086286A (en) * | 2016-08-02 | 2016-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-bearing hot metal smelts the method controlling steelmaking converter tapping phosphorus content |
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