CN108085445A - A kind of method for preparing phosphoric pig iron - Google Patents
A kind of method for preparing phosphoric pig iron Download PDFInfo
- Publication number
- CN108085445A CN108085445A CN201611033782.4A CN201611033782A CN108085445A CN 108085445 A CN108085445 A CN 108085445A CN 201611033782 A CN201611033782 A CN 201611033782A CN 108085445 A CN108085445 A CN 108085445A
- Authority
- CN
- China
- Prior art keywords
- slag
- molten iron
- iron
- pig iron
- phosphoric pig
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
A kind of method for preparing phosphoric pig iron, carries out according to the following steps：（1）Using the molten iron of melting as raw material, converter dephosphorization slag is poured into molten iron, adds coke blacking and quartz sand；（2）Heating by O2 blowing, reaction temperature are 1530 ~ 1550 DEG C, and the reaction time is 20 ~ 30min, obtain intermediate molten iron；（3）Using intermediate molten iron as raw material, repeat the above steps.The present invention is effectively utilized metallurgical steel slag resource, at low cost, and the converter dephosphorization slag for solving the problems, such as to perplex people all the time cannot recycle in metallurgical process.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of method for preparing phosphoric pig iron.
Background technology
Slag is one of discarded object of power boiler discharge discharged in Ferrous Metallurgy flow.With the quick hair of China's steel and iron industry
Exhibition, the discharge capacity of slag increase year by year, and 5.01 hundred million tons of China's crude steel yield in 2008 accounts for the 37.7% of world's crude steel total output, steel
Slag discharge capacity calculates that China increases 50,000,000 tons or so of slag newly every year according to the standard of 100kg/ tons of steel.Big steel slag such as cannot
It recycles in time, air storage does not only take up a large amount of soils, and seriously pollutes periphery Ecological environment, and in addition slag carries
A large amount of thermal energy and the valuable element being rich in will be also lost in vain, cause the huge wasting of resources.Slag is pre-processed including molten iron
Slag, vessel slag and refining waste residue etc., these slags are generated according to specific task of smelting, and ingredient difference is larger.
To the dephosphorized slag that steelmaking process generates, each business processes mode is different.Cinder field is stacked by most of enterprise
Processing carries out magnetic separation to the clinker after the natural cooling dusting of part, therefrom chooses the smaller metallic iron of ratio, this Land use systems
Environmental pollution is serious, and utility value is relatively low, has wasted a large amount of useful resources.
The Cycle cumulative effect of phosphorus is limited to, domestic and international researcher has carried out the trial of vessel slag dephosphorization, and deficiency is,
Phosphorus is stabilized in slag, P in slag2O5Activity is low, and removing phosphorus must rely on high temperature and realize slag sluicing system, be difficult in cost
Ensure.
The content of the invention
For problem present on above-mentioned converter dephosphorization Slag treatment, the present invention provides a kind of method for preparing phosphoric pig iron,
Purpose is to make full use of converter dephosphorization slag, while phosphoric pig iron is produced, reduces the phosphorus content of converter dephosphorization slag.
The method of the present invention carries out according to the following steps：
1st, using the molten iron of melting as raw material, converter dephosphorization slag is poured into molten iron, adds coke blacking and quartz sand, converter
The mass ratio of dephosphorized slag and molten iron is 0.5 ~ 0.7, and the mass ratio of coke blacking and converter dephosphorization slag is 0.3 ~ 0.5, quartz sand
Addition is 1.0 ~ 1.2 by basicity of slag control；
2nd, heating by O2 blowing is carried out to above-mentioned material, reaction temperature is 1530 ~ 1550 DEG C, and the reaction time is 20 ~ 30min, and reaction is tied
The clinker of acquisition is removed after beam, obtains intermediate molten iron；
3rd, using intermediate molten iron as raw material, repeat the above steps 1 ~ 2 time, obtain phosphoric pig iron.
Above-mentioned coke blacking and the granularity of quartzy gravel are in 0.5 ~ 1.0mm.
The converter dephosphorization slag ingredient scope that the above method uses is by mass percentage for FeO5 ~ 15%, CaO40 ~ 50%, SiO2
15 ~ 25%, MnO 3 ~ 6%, MgO 4 ~ 6%, Al2O32 ~ 5%, P2O55 ~ 8%, free CaO 0.5 ~ 2.7%, surplus is impurity.
P in the mixture for the clinker that each reduction obtains in the above method2O5Removal rate by mass percentage be more than 90%.
The P content for the phosphoric pig iron that the above method obtains is 5 ~ 8%, and C content is 3 ~ 4%.
The method of the present invention is by controlling the mass ratio of reduction temperature, solid carbon and dephosphorized slag and dephosphorized slag and molten iron
Mass ratio, add in quartz sand to converter dephosphorization slag carry out modifying process, realize effective dephosphorization of dephosphorized slag, and obtain one kind
Low-grade phosphoric pig iron.
The present invention is effectively utilized metallurgical steel slag resource, at low cost, solves the converter dephosphorization for perplexing people all the time
The problem that slag cannot recycle in metallurgical process, and high value added product-phosphoric pig iron has been obtained, reduce steel plant
Slag pollutes and waste discharge amount, improves operating environment, and energy-saving and emission-reduction are completed to enterprise, implement green ecological metallurgy, drop
Low environment pollution is of great significance.
Specific embodiment
The ingredient of the molten iron raw material used in the embodiment of the present invention is by weight percentage for C 4.0 ~ 4.4%, Si 0.02
~ 0.05%, Mn 0.2 ~ 0.5%, S 0.005 ~ 0.05%, P 0.005 ~ 0.06%, surplus are iron.
Converter dephosphorization slag ingredient scope in the embodiment of the present invention is by mass percentage FeO5 ~ 15%, CaO40 ~ 50%,
SiO2 15 ~ 25%, MnO 3 ~ 6%, MgO 4 ~ 6%, Al2O32 ~ 5%, P2O55 ~ 8%, free CaO 0.5 ~ 2.7%, surplus is impurity.
The granularity of coke blacking and quartzy gravel in the embodiment of the present invention is in 0.5 ~ 1.0mm.
P in the mixture for the clinker that each reduction obtains in the embodiment of the present invention2O5Removal rate be more than by mass percentage
90%。
The P content of the phosphoric pig iron obtained in the embodiment of the present invention is 5 ~ 8%, and C content is 3 ~ 4%.
Embodiment 1
Using the molten iron of melting as raw material, converter dephosphorization slag is poured into molten iron, adds coke blacking and quartz sand, converter takes off
The mass ratio of phosphorus slag and molten iron is 0.5, and the mass ratio of coke blacking and converter dephosphorization slag is 0.5, and the addition of quartz sand presses stove
Basicity of slag control is 1.0；
Heating by O2 blowing is carried out to above-mentioned material, reaction temperature is 1550 DEG C, reaction time 20min, will be obtained after reaction
Clinker removal, obtain among molten iron；
It using intermediate molten iron as raw material, repeats the above steps 1 time, obtains phosphoric pig iron.
Embodiment 2
Using the molten iron of melting as raw material, converter dephosphorization slag is poured into molten iron, adds coke blacking and quartz sand, converter takes off
The mass ratio of phosphorus slag and molten iron is 0.6, and the mass ratio of coke blacking and converter dephosphorization slag is 0.4, and the addition of quartz sand presses stove
Basicity of slag control is 1.1；
Heating by O2 blowing is carried out to above-mentioned material, reaction temperature is 1540 DEG C, reaction time 25min, will be obtained after reaction
Clinker removal, obtain among molten iron；
It using intermediate molten iron as raw material, repeats the above steps 2 times, obtains phosphoric pig iron.
Embodiment 3
Using the molten iron of melting as raw material, converter dephosphorization slag is poured into molten iron, adds coke blacking and quartz sand, converter takes off
The mass ratio of phosphorus slag and molten iron is 0.7, and the mass ratio of coke blacking and converter dephosphorization slag is 0.3, and the addition of quartz sand presses stove
Basicity of slag control is 1.2；
Heating by O2 blowing is carried out to above-mentioned material, reaction temperature is 1530 DEG C, reaction time 30min, will be obtained after reaction
Clinker removal, obtain among molten iron；
It using intermediate molten iron as raw material, repeats the above steps 2 times, obtains phosphoric pig iron.
Claims (3)
- A kind of 1. method for preparing phosphoric pig iron, it is characterised in that carry out according to the following steps：（1）Using the molten iron of melting as raw material, converter dephosphorization slag is poured into molten iron, adds coke blacking and quartz sand, turned The mass ratio of stove dephosphorized slag and molten iron is 0.5 ~ 0.7, and the mass ratio of coke blacking and converter dephosphorization slag is 0.3 ~ 0.5, quartz sand Addition by basicity of slag control for 1.0 ~ 1.2；（2）Heating by O2 blowing is carried out to above-mentioned material, reaction temperature is 1530 ~ 1550 DEG C, and the reaction time is 20 ~ 30min, and reaction is tied The clinker of acquisition is removed after beam, obtains intermediate molten iron；（3）It using intermediate molten iron as raw material, repeats the above steps 1 ~ 2 time, obtains phosphoric pig iron.
- 2. a kind of method for preparing phosphoric pig iron according to claim 1, it is characterised in that the converter dephosphorization slag into It is FeO5 ~ 15%, CaO40 ~ 50%, SiO by mass percentage to divide scope2 15 ~ 25%, MnO 3 ~ 6%, MgO 4 ~ 6%, Al2O3 2~ 5%, P2O55 ~ 8%, free CaO 0.5 ~ 2.7%, surplus is impurity.
- 3. a kind of method for preparing phosphoric pig iron according to claim 1, it is characterised in that the P of the phosphoric pig iron contains It measures as 5 ~ 8%, C content is 3 ~ 4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033782.4A CN108085445A (en) | 2016-11-23 | 2016-11-23 | A kind of method for preparing phosphoric pig iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033782.4A CN108085445A (en) | 2016-11-23 | 2016-11-23 | A kind of method for preparing phosphoric pig iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108085445A true CN108085445A (en) | 2018-05-29 |
Family
ID=62169913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611033782.4A Pending CN108085445A (en) | 2016-11-23 | 2016-11-23 | A kind of method for preparing phosphoric pig iron |
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| Country | Link |
|---|---|
| CN (1) | CN108085445A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110042179A (en) * | 2019-05-29 | 2019-07-23 | 新疆八一钢铁股份有限公司 | A kind of method that high phosphorus slag fine powder participates in mixing dosage |
-
2016
- 2016-11-23 CN CN201611033782.4A patent/CN108085445A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110042179A (en) * | 2019-05-29 | 2019-07-23 | 新疆八一钢铁股份有限公司 | A kind of method that high phosphorus slag fine powder participates in mixing dosage |
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Legal Events
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180529 |