CN108998616A - A kind of purification of the pig iron and its smelting process - Google Patents
A kind of purification of the pig iron and its smelting process Download PDFInfo
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- CN108998616A CN108998616A CN201811072091.4A CN201811072091A CN108998616A CN 108998616 A CN108998616 A CN 108998616A CN 201811072091 A CN201811072091 A CN 201811072091A CN 108998616 A CN108998616 A CN 108998616A
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- pig iron
- weight
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- iron
- purification
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—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
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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 present invention provides a kind of methods of purification of pig iron, comprising the following steps: smelts phosphoric pig iron in blast furnace, is heated to 1200-1300 DEG C, obtains molten iron；The molten iron is added into converter, Fe is then added in converter2O3、CaO、CaF2、CaC2、CaSi、Al2O3, 3-10h is handled at 1300-1400 DEG C.The present invention also provides a kind of smelting processes of pig iron, including pig iron method of purification described in above-mentioned technical proposal.Compared with prior art, the present invention is with Fe2O3、CaO、CaF2、CaC2、CaSi、Al2O3For Dephosphorising agent, each ingredient interaction influences each other, and controls reaction temperature, realizes purification and smelting to the pig iron, reduce the phosphorus content of phosphoric pig iron, improve product purity.
Description
Technical field
The present invention relates to iron and steel smelting technology field more particularly to a kind of purification of pig iron and its smelting processes.
Background technique
In recent years, as the continuous of international Iron Ore stone price is risen, low-grade iron ore is increasingly taken seriously.Ore
The decline of grade causes molten iron impurity content to increase, and wherein phosphorus is one of main harmful element, and the main harm of phosphorus is drop in steel
The plasticity and toughness and solderability of low steel, when steel bar welding, the main harm of phosphorus is to keep weld seam generation cold short existing
As with the increase of phosphorus content, the toughness for causing weld metal, particularly low-temperature impact toughness are declined.This molten iron will reach
Liquid iron pretreatment dephosphorizing must be carried out to subsequent steel-making requirements.1980, Sweden carried out the research of high phosphorus hot metal preconditioning technique.
From the later period of the 1970s, molten iron pretreatment-converter-external refining has become a kind of trend of steel industry.
In the prior art, extensive report has been obtained in the smelting of the pig iron and method of purification, for example, application No. is
The Chinese patent literature of 201510591247.X reports a kind of blast furnace smelting method of foundry pig iron, and silica is made powdered
Cab-O-sil after, by a certain amount of Cab-O-sil, blast furnace is entered by tuyere injection, Cab-O-sil can individually be blown into blast furnace, can also
To be blown into blast furnace by coal rifle after mixing with coal dust, Cab-O-sil is finally dissolved into the pig iron, forms casting silvery pig iron.Shen
Please number for 201410241505.7 a Chinese patent literature report it is a kind of using chromium slag smelt the method containing chromium pig iron, will be without calcium
Chromium slag, coke powder, fluorite mixing, are added sodium metasilicate, pressure ball, obtains non-calcium chromium slags pressure ball material after mixing evenly；Using electric arc furnaces smelting
It refines, entire smelting process is divided into smelting early period, mid-term is smelted and the later period smelts, smelting early period, mid-term smelting and later period smelting
Investment non-calcium chromium slags pressure ball material, silica, coke and iron ore, electric arc stove heating are smelted, in electric arc furnaces material melting at
After molten condition, next phase smelting is entered；Material is refined after melting completely, is cast using ladle, and removing contains
Chromium pig iron slag is obtained containing chromium pig iron.
But above-mentioned report to the smelting and purification of phosphoric pig iron and is not suitable for, and influences the purity of product.The present inventor examines
Consider, a kind of purification of the pig iron and its smelting process are provided, the phosphorus content of phosphoric pig iron is reduced, improves product purity.
Summary of the invention
Present invention solves the technical problem that being to provide a kind of pig iron purification and its smelting process, the phosphorus of phosphoric pig iron is reduced
Content improves product purity.
In view of this, the present invention provides a kind of methods of purification of pig iron, comprising the following steps: step a) is by 800-1500
Parts by weight phosphoric pig iron is smelted in blast furnace, is heated to 1200-1300 DEG C, obtains molten iron；Step b) adds the molten iron
Enter into converter, 0.6-1.6 parts by weight Fe is then added in converter2O3, 1-5 parts by weight CaO, 0.8-1.9 parts by weight CaF2、
1-3 parts by weight CaC2, 0.4-1 parts by weight CaSi, 0.5-1.2 parts by weight Al2O3, 3-10h is handled at 1300-1400 DEG C.
Preferably, the Fe2O3For 0.8-1.2 parts by weight.
Preferably, the CaO is 1-5 parts by weight.
Preferably, the CaF2For 0.8-1.9 parts by weight.
Preferably, the CaC2For 1-3 parts by weight.
Preferably, the CaSi is 0.4-1 parts by weight.
Preferably, the Al2O3For 0.5-1.2 parts by weight.
Preferably, treatment temperature is 1350-1400 DEG C in step b.
Preferably, it is 5-8h that the time is handled in step b.
Correspondingly, being purified the present invention also provides a kind of smelting process of pig iron including the pig iron described in above-mentioned technical proposal
Method.
The present invention provides a kind of method of purification of pig iron, comprising the following steps: step a) is by 800-1500 parts by weight high phosphorus
The pig iron is smelted in blast furnace, is heated to 1200-1300 DEG C, obtains molten iron；The molten iron is added into converter step b),
Then 0.6-1.6 parts by weight Fe is added in converter2O3, 1-5 parts by weight CaO, 0.8-1.9 parts by weight CaF2, 1-3 parts by weight
CaC2, 0.4-1 parts by weight CaSi, 0.5-1.2 parts by weight Al2O3, 3-10h is handled at 1300-1400 DEG C.The present invention also provides
A kind of smelting process of the pig iron, including pig iron method of purification described in above-mentioned technical proposal.Compared with prior art, the present invention with
Fe2O3、CaO、CaF2、CaC2、CaSi、Al2O3For Dephosphorising agent, each ingredient interaction influences each other, and controls reaction temperature
Degree, accomplished purification and smelting to the pig iron reduce the phosphorus content of phosphoric pig iron, improve product purity.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
The embodiment of the invention discloses a kind of methods of purification of pig iron, comprising the following steps: step a) is heavy by 800-1500
Amount part phosphoric pig iron is smelted in blast furnace, is heated to 1200-1300 DEG C, is obtained molten iron；The molten iron is added step b)
Into converter, the Fe of 0.6-1.6 parts by weight is then added in converter2O3, 1-5 parts by weight CaO, 0.8-1.9 parts by weight
CaF2, 1-3 parts by weight CaC2, 0.4-1 parts by weight CaSi, 0.5-1.2 parts by weight Al2O3, at 1300-1400 DEG C
Manage 3-10h.
Phosphoric pig iron used in the embodiment of the present invention is by following weight ratio at being grouped as: 3.8% C, 1.6% Si,
0.5% Mn, 1.3% P, 0.2% S, surplus Fe.
In the phosphorus pig iron, C can change the elementary organization of cast iron, to change the intensity and hardness of cast iron, change cast iron
Mobility, the carbon content appropriate that increases can reduce the Fe-C pressure drop of anode.Si is to promote graphite element, changes the stream of iron liquid
Dynamic property, reduces the contraction of cast iron.
P is the cold brittleness for increasing the phosphorus pig iron, plays a part of increasing iron liquid mobility, improves the brittleness of the phosphorus pig iron, have
Conducive to phosphorus pig iron iron hoop press releasing machine load is mitigated, the consumption of standby redundancy is reduced, reduces maintenance cost.The main harm of phosphorus in steel
It is the plasticity and toughness and solderability for reducing steel, when steel bar welding, the main harm of phosphorus is that generate weld seam cold
Crisp phenomenon declines the toughness for causing weld metal, particularly low-temperature impact toughness with the increase of phosphorus content.
Mn is carbide-forming element, increases the intensity, hardness and dense structure of cast iron, reduces the mobility of iron liquid, have
Desulfidation.S can reduce the mobility of molten iron, increase the contraction of cast iron, increase cast iron hot tearing.But in actual production process
In, the C of foundry return is burnt, and P, S enrichment cause the service performance of the phosphorus pig iron to reduce, the pressure drop of iron carbon is increased.
Preferably, in the Dephosphorising agent that the present invention uses, the Fe2O3Preferably 0.8-1.2 parts by weight, the CaO
Preferably 1-5 parts by weight, the CaF2Preferably 0.8-1.9 parts by weight, the CaC2Preferably 1-3 parts by weight, the CaSi are excellent
It is selected as 0.4-1 parts by weight, the Al2O3Preferably 0.5-1.2 parts by weight.
Preferably, treatment temperature is preferably 1350-1400 DEG C in step b, and more preferably 1380-1400 DEG C；Place
Managing the time is preferably 5-8h, more preferably 6-8h.
Correspondingly, being purified the present invention also provides a kind of smelting process of pig iron including the pig iron described in above-mentioned technical proposal
Method.
From above scheme as can be seen that the present invention provides a kind of method of purification of pig iron, comprising the following steps: by 800-
1500 parts by weight phosphoric pig iron are smelted in blast furnace, are heated to 1200-1300 DEG C, are obtained molten iron；The molten iron is added
Into converter, 0.6-1.6 parts by weight Fe is then added in converter2O3, 1-5 parts by weight CaO, 0.8-1.9 parts by weight CaF2、1-3
Parts by weight CaC2, 0.4-1 parts by weight CaSi, 0.5-1.2 parts by weight Al2O3, 3-10h is handled at 1300-1400 DEG C.The present invention
A kind of smelting process of pig iron is also provided, including pig iron method of purification described in above-mentioned technical proposal.Compared with prior art, originally
Invention is with Fe2O3、CaO、CaF2、CaC2、CaSi、Al2O3For Dephosphorising agent, each ingredient interaction influences each other, and controls
Reaction temperature, accomplished purification and smelting to the pig iron reduce the phosphorus content of phosphoric pig iron, improve product purity.
For a further understanding of the present invention, technical solution provided by the invention is carried out specifically below with reference to embodiment
Bright, protection scope of the present invention is not limited by the following examples.
Raw material used in the embodiment of the present invention is commercially available.
Phosphoric pig iron used in the embodiment of the present invention is by following weight ratio at being grouped as: 3.8% C, 1.6% Si,
0.5% Mn, 1.3% P, 0.2% S, surplus Fe.
Embodiment 1
1280 DEG C of the phosphoric pig iron obtained after 1 ton of phosphoric pig iron is smelted in blast furnace is added in converter, then
1kg Fe is added in converter2O3(oxidant), 3kg CaO (fixative), 1.5kg CaF2(fluxing agent), 1kg CaC2、
0.8kg CaSi、0.6kg Al2O3, processing 5h is carried out under the conditions of 1350 DEG C of temperature.
The P content of the pig iron after the present embodiment purification is measured, content 0.6%, it is seen that there is good purification
Effect.
Embodiment 2
1300 DEG C of the phosphoric pig iron obtained after 1 ton of phosphoric pig iron is smelted in blast furnace is added in converter, then
0.6kg Fe is added in converter2O3(oxidant), 5kg CaO (fixative), 0.8kg CaF2(fluxing agent), 3kg CaC2、
0.4kg CaSi、1.2kg Al2O3, processing 3h is carried out under the conditions of 1350 DEG C of temperature.
The P content of the pig iron after the present embodiment purification is measured, content 0.58%, it is seen that there is good purification
Effect.
Embodiment 3
1280 DEG C of the phosphoric pig iron obtained after 1 ton of phosphoric pig iron is smelted in blast furnace is added in converter, then
1.6kg Fe is added in converter2O3(oxidant), 1kg CaO (fixative), 1.9kg CaF2(fluxing agent), 1kg CaC2、
0.8kg CaSi、0.5kg Al2O3, processing 8h is carried out under the conditions of 1350 DEG C of temperature.
The P content of the pig iron after the present embodiment purification is measured, content 0.63%, it is seen that there is good purification
Effect.
Embodiment 4
1280 DEG C of the phosphoric pig iron obtained after 1 ton of phosphoric pig iron is smelted in blast furnace is added in converter, then
1.2kg Fe is added in converter2O3(oxidant), 4kg CaO (fixative), 1.3kg CaF2(fluxing agent), 1.8kg CaC2、
0.5kg CaSi、1.2kg Al2O3, processing 6h is carried out under the conditions of 1400 DEG C of temperature.
The P content of the pig iron after the present embodiment purification is measured, content 0.61%, it is seen that there is good purification
Effect.
Embodiment 5
1280 DEG C of the phosphoric pig iron obtained after 1 ton of phosphoric pig iron is smelted in blast furnace is added in converter, then
0.6kg Fe is added in converter2O3(oxidant), 1kg CaO (fixative), 1.9kg CaF2(fluxing agent), 3kg CaC2、
0.4kg CaSi、0.5kg Al2O3, processing 8h is carried out under the conditions of 1350 DEG C of temperature.
The P content of the pig iron after the present embodiment purification is measured, content 0.57%, it is seen that there is good purification
Effect.
Embodiment 6
1260 DEG C of the phosphoric pig iron obtained after 1 ton of phosphoric pig iron is smelted in blast furnace is added in converter, then
1.6kg Fe is added in converter2O3(oxidant), 5kg CaO (fixative), 0.8kg CaF2(fluxing agent), 2.5kg CaC2、
1kg CaSi、1kg Al2O3, processing 3h is carried out under the conditions of 1350 DEG C of temperature.
The P content of the pig iron after the present embodiment purification is measured, content 0.57%, it is seen that there is good purification
Effect.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of method of purification of the pig iron, which comprises the following steps:
Step a) smelts 800-1500 parts by weight phosphoric pig iron in blast furnace, is heated to 1200-1300 DEG C, obtains iron
Water；
The molten iron is added into converter step b), and the Fe of 0.6-1.6 parts by weight is then added in converter2O3, 1-5 weight
The CaF of CaO, 0.8-1.9 parts by weight of part2, 1-3 parts by weight CaC2, 0.4-1 parts by weight CaSi, 0.5-1.2 parts by weight
Al2O3, 3-10h is handled at 1300-1400 DEG C.
2. method of purification according to claim 1, which is characterized in that the Fe2O3For 0.8-1.2 parts by weight.
3. method of purification according to claim 1, which is characterized in that the CaO is 1-5 parts by weight.
4. method of purification according to claim 1, which is characterized in that the CaF2For 0.8-1.9 parts by weight.
5. method of purification according to claim 1, which is characterized in that the CaC2For 1-3 parts by weight.
6. method of purification according to claim 1, which is characterized in that the CaSi is 0.4-1 parts by weight.
7. method of purification according to claim 1, which is characterized in that the Al2O3For 0.5-1.2 parts by weight.
8. method of purification according to claim 1, which is characterized in that treatment temperature is 1350-1400 DEG C in step b.
9. method of purification according to claim 1, which is characterized in that handling the time in step b is 5-8h.
10. a kind of smelting process of the pig iron, which is characterized in that including pig iron purification side described in any one of claim 1-9
Method.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1730960A (en) * | 1926-07-17 | 1929-10-08 | Wust Fritz | Purifying pig iron |
| CN85101003A (en) * | 1985-04-01 | 1986-08-06 | 机械工业部设计研究总院 | The dephosphorization technology of low-phosphorous high chromium-stainless steel and ultralow phosphorus high chromium-stainless steel |
| CN101250610A (en) * | 2008-03-31 | 2008-08-27 | 山西太钢不锈钢股份有限公司 | Dephosphorising method for low nickel chromium molten iron or foundry iron |
| CN101643811A (en) * | 2009-08-28 | 2010-02-10 | 昆明钢铁控股有限公司 | Method for producing low-phosphorous molten iron by high-phosphorous reduced iron |
| CN102094100A (en) * | 2011-03-18 | 2011-06-15 | 武汉钢铁(集团)公司 | Molten iron dephosphorizing agent and application method thereof |
| CN102312033A (en) * | 2011-07-28 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of high-phosphorous chromium-nickel pig iron |
| CN102899454A (en) * | 2012-11-11 | 2013-01-30 | 杨江莲 | External jetting dephosphorization agent for molten steel (iron) furnace |
-
2018
- 2018-09-14 CN CN201811072091.4A patent/CN108998616A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1730960A (en) * | 1926-07-17 | 1929-10-08 | Wust Fritz | Purifying pig iron |
| CN85101003A (en) * | 1985-04-01 | 1986-08-06 | 机械工业部设计研究总院 | The dephosphorization technology of low-phosphorous high chromium-stainless steel and ultralow phosphorus high chromium-stainless steel |
| CN101250610A (en) * | 2008-03-31 | 2008-08-27 | 山西太钢不锈钢股份有限公司 | Dephosphorising method for low nickel chromium molten iron or foundry iron |
| CN101643811A (en) * | 2009-08-28 | 2010-02-10 | 昆明钢铁控股有限公司 | Method for producing low-phosphorous molten iron by high-phosphorous reduced iron |
| CN102094100A (en) * | 2011-03-18 | 2011-06-15 | 武汉钢铁(集团)公司 | Molten iron dephosphorizing agent and application method thereof |
| CN102312033A (en) * | 2011-07-28 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of high-phosphorous chromium-nickel pig iron |
| CN102899454A (en) * | 2012-11-11 | 2013-01-30 | 杨江莲 | External jetting dephosphorization agent for molten steel (iron) furnace |
Non-Patent Citations (1)
| Title |
|---|
| 钢铁研究院一室: "《日本氧气顶吹转炉钢的品种和实验研究》", 31 December 1900 * |
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