CN105063264B - A kind of method for preparing pure iron - Google Patents
A kind of method for preparing pure iron Download PDFInfo
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- CN105063264B CN105063264B CN201510555730.2A CN201510555730A CN105063264B CN 105063264 B CN105063264 B CN 105063264B CN 201510555730 A CN201510555730 A CN 201510555730A CN 105063264 B CN105063264 B CN 105063264B
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Abstract
A kind of method for preparing pure iron, belongs to metallurgical technology field, carries out according to the following steps：（1）It is Raw Ore to use extraction of superpure concentrate of magnetite；（2）It is pressed into pelletizing；（3）By reducing agent and desulphurizer mixing uniformly, then mixing with pelletizing carries out selective reduction, obtains reduction iron block；（4）Electrothermal smetling is carried out after mixing with ferrous oxide, casting obtains pure iron.The method of the present invention need not carry out that oxygen blast etc. is complicated and equipment requirement operation high, directly carry out reduction melting, can be greatly lowered cost, and the pure iron purity of preparation is high, carbon content is low.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of method for preparing pure iron.
Background technology
Pure iron is one of engineering material that Modern Heavy is wanted, widely used；Meanwhile, pure iron is magnetic material, clean steel, amorphous
The base-material of state material production；Pure iron is divided into ingot iron according to its chemical composition（Containing C≤0.020%, Fe ≮ 99.50%）, pure iron（Contain
C≤0.0050%,Fe≮99.90%）And ultra pure iron（Containing C≤0.0050%, Fe ≮ 99.98%）；Ingot iron includes pure iron as raw material
（YT classes）And electrical pure iron（DT classes）.
Pure iron is widely used, and its production cost and price are influence pure iron, ultra pure iron using territory and use consumption
Determinant；China only has ingot iron industrialized production, and pure iron and ultra pure iron do not have industrialized production enterprise, for testing
The pure iron and ultra pure iron of research and the development of special material rely primarily on high price import；And China prepare at present the method for pure iron into
This is very high, and the method for external comparative maturity is also substantially electrolysis and chemical method, and the requirement of flow complex device is high；Therefore exploitation one
The pure iron preparation method of low cost is planted, is the current urgent problem of China.
The content of the invention
For the above mentioned problem that existing pure iron technology of preparing is present, the present invention provides a kind of method for preparing pure iron, uses
Extraction of superpure concentrate of magnetite is raw material, and chosen property low-temperature reduction is made iron block, then smelting, is reducing cost, the basis of simple flow
On, obtain high-purity low-carbon (LC) pure iron.
The method of the present invention is carried out according to the following steps：
1st, it is Raw Ore to use extraction of superpure concentrate of magnetite, and the Iron grade of described extraction of superpure concentrate of magnetite is 71.5 ~ 72%, SiO2Weight
Amount content is 0.1 ~ 0.3%；
The 2nd, Raw Ore is pressed into the pelletizing of 20 ~ 40mm of particle diameter；
3rd, reducing agent and desulphurizer mixing are uniformly made compound, reduction is put into after pelletizing is mixed again with compound
In stove, compound covering pelletizing, and desulfurizing agent is the 3 ~ 5% of pelletizing gross weight；Then whole materials are heated to 1000 ~
1150 DEG C, 8 ~ 10h of insulation carries out selective reduction, obtains reduction iron block；Described reducing agent is noncaking coal；
4th, will reduction iron block take out after clean out, then carry out electrothermal smetling with electrothermal furnace after mixing with ferrous oxide, go
Except the impurity of generation in fusion process, finally casting obtains pure iron；Wherein ferrous oxide is reduce iron block gross weight 3 ~ 5%.
Above-mentioned noncaking coal selects bituminous coal, lignite or anthracite.
Above-mentioned reduction furnace is direct reduction furnace, from coal base shaft furnace or tunnel cave.
Above-mentioned electrothermal furnace selects induction furnace.
Contain Fe 97.5 ~ 99.5%, C 0.2 ~ 1.5%, O 0.2 ~ 1.5% in above-mentioned reduction iron block by weight percentage, it is remaining
It is other impurities to measure.
Above-mentioned desulfurizing agent is lime stone.
Above-mentioned reduction iron block is spongy.
The pure iron that the above method is obtained contains Fe >=99.50% by weight percentage, containing C≤0.0050%.
Principle of the invention is：It is raw material by using extraction of superpure concentrate of magnetite, reduces the impurity in raw material；Then low temperature is used
Be reduced directly, in reduction process, metallic iron can be reduced into iron mineral, at the same Si in extraction of superpure concentrate of magnetite, Mn, V, Ti,
The relict elements such as Cr and B are not reduced, thus do not enter metal phase, reach the effect of selective reduction；Due in reduction iron block
Carbon need to be further removed containing carbon, therefore during melting；Therefore the percent reduction in reduction process can be controlled, makes to be deposited in reduction iron block
Stay partial oxidation ferrous, ferrous oxide is directly as decarburizer in fusion process；Ferrous oxide is caused to contain when percent reduction is higher
When measuring relatively low, decarburization is carried out by adding ferrous oxide；Unreacted ferrous oxide forms impurity after melting.
The method of the present invention is compared with existing pure iron technology of preparing, it is not necessary to carry out the complexity such as oxygen blast and equipment requirement is high
Operation, directly carry out reduction melting, can be greatly lowered cost, the pure iron purity of preparation is high, carbon content is low, can be according to user
Requirement to product, using operations such as BOTTOM ARGON BLOWING refining, electroslag remelting, vacuum outgas, or using combined production process refining, to ensure
The stabilization of the chemical composition of product.
Specific embodiment
The extraction of superpure concentrate of magnetite used in the embodiment of the present invention is for using one disclosed in the patent of Publication No. 103861733A
Plant the method preparation that magnetic separation-reverse flotation prepares extraction of superpure concentrate of magnetite.
Bituminous coal, lignite, anthracite and the lime stone used in the embodiment of the present invention are commercial products, and granularity is≤2mm.
The ferrous oxide used in the embodiment of the present invention is commercial products, purity >=95%.
The reduction furnace used in the embodiment of the present invention selects coal base shaft furnace or tunnel cave.
It is GB/T-6730.70-2013 that iron content accepted standard is tested in the embodiment of the present invention.
Electrothermal furnace in the embodiment of the present invention selects induction furnace.
The oxygen element in reduction iron block in the present invention exists in the form of the oxide of iron.
Embodiment 1
It is Raw Ore to use extraction of superpure concentrate of magnetite, and the Iron grade of described extraction of superpure concentrate of magnetite is 71.5%, SiO2Weight content
It is 0.3%；
Raw Ore is pressed into the pelletizing of particle diameter 20mm；
Reducing agent and desulphurizer mixing are uniformly made compound, reduction furnace is put into after pelletizing is mixed again with compound
In, compound covering pelletizing, and desulfurizing agent is the 3% of pelletizing gross weight；Then whole materials are heated to 1000 DEG C, insulation
10h carries out selective reduction, obtains spongiform reduction iron block；Described reducing agent is bituminous coal；Pressed in described reduction iron block
Percentage by weight contains Fe 97.5%, C 1%, O 1%, balance of other impurities；Described desulfurizing agent is lime stone；
Will reduction iron block take out after clean out, then electrothermal smetling is carried out with electrothermal furnace after mix with ferrous oxide, removal
The impurity produced in fusion process, finally casting obtains pure iron；Wherein ferrous oxide is reduce iron block gross weight 3 ~ 5%；
The pure iron of acquisition contains Fe 99.55% by weight percentage, containing C 0.0048%.
Embodiment 2
Method is with embodiment 1, difference：
（1）The Iron grade of extraction of superpure concentrate of magnetite is 71.8%, SiO2Weight content be 0.2%；
（2）Raw Ore is pressed into the pelletizing of particle diameter 30mm；
（3）Desulfurizing agent is the 4% of pelletizing gross weight；Whole materials are heated to 1100 DEG C, and insulation 9h carries out selective reduction；
Reducing agent is lignite；Contain Fe 98.3%, C 0.6%, O 0.4%, balance of other impurities by weight percentage in reduction iron block；
（4）The ferrous oxide added during electrothermal smetling is reduce iron block gross weight 4%；
（5）Pure iron contains Fe 99.60% by weight percentage, containing C 0.0044%.
Embodiment 3
Method is with embodiment 1, difference：
（1）The Iron grade of extraction of superpure concentrate of magnetite is 72%, SiO2Weight content be 0.1%；
（2）Raw Ore is pressed into the pelletizing of particle diameter 40mm；
（3）Desulfurizing agent is the 5% of pelletizing gross weight；Whole materials are heated to 1150 DEG C, and insulation 8h carries out selective reduction；
Reducing agent is anthracite；Contain Fe 99.5%, C 0.2%, O 0.2%, balance of other impurities by weight percentage in reduction iron block；
（4）The ferrous oxide added during electrothermal smetling is reduce iron block gross weight 5%；
（5）Pure iron contains Fe 99.63% by weight percentage, containing C 0.0041%.
Claims (2)
1. a kind of method for preparing pure iron, it is characterised in that carry out according to the following steps：
（1）It is Raw Ore to use extraction of superpure concentrate of magnetite, and the Iron grade of described extraction of superpure concentrate of magnetite is 71.5 ~ 72%, SiO2Weight contain
Measure is 0.1 ~ 0.3%；
（2）Raw Ore is pressed into the pelletizing of 20 ~ 40mm of particle diameter；
（3）Reducing agent and desulphurizer mixing are uniformly made compound, reduction furnace is put into after pelletizing is mixed again with compound
In, compound covering pelletizing, and desulfurizing agent is the 3 ~ 5% of pelletizing gross weight；Then whole materials are heated to 1000 ~ 1150
DEG C, 8 ~ 10h of insulation carries out selective reduction, obtains reduction iron block；Described reducing agent is noncaking coal；Described noncaking coal
From bituminous coal, lignite or anthracite；Contain Fe 97.5 ~ 99.5%, C 0.2 ~ 1.5% in described reduction iron block by weight percentage,
O 0.2 ~ 1.5%, balance of other impurities；
（4）Will reduction iron block take out after clean out, then electrothermal smetling is carried out after mix with ferrous oxide with electrothermal furnace, removal is melted
The impurity produced during refining, finally casting obtains pure iron；Wherein ferrous oxide is reduce iron block gross weight 3 ~ 5%；Described
Pure iron contains Fe >=99.50% by weight percentage, containing C≤0.0050%.
2. a kind of method for preparing pure iron according to claim 1, it is characterised in that described reduction iron block is spongy.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538634A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Smelting process and device of pure iron |
| CN103861733A (en) * | 2014-03-26 | 2014-06-18 | 东北大学 | Method for preparing super iron concentrates through magnetic separation-reverse flotation technology |
| CN103937960A (en) * | 2014-04-08 | 2014-07-23 | 东北大学 | Staged reduction method of boron-containing iron ore concentrate |
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- 2015-09-02 CN CN201510555730.2A patent/CN105063264B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538634A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Smelting process and device of pure iron |
| CN103861733A (en) * | 2014-03-26 | 2014-06-18 | 东北大学 | Method for preparing super iron concentrates through magnetic separation-reverse flotation technology |
| CN103937960A (en) * | 2014-04-08 | 2014-07-23 | 东北大学 | Staged reduction method of boron-containing iron ore concentrate |
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