CN105063264A - Method for preparing pure iron - Google Patents
Method for preparing pure iron Download PDFInfo
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- CN105063264A CN105063264A CN201510555730.2A CN201510555730A CN105063264A CN 105063264 A CN105063264 A CN 105063264A CN 201510555730 A CN201510555730 A CN 201510555730A CN 105063264 A CN105063264 A CN 105063264A
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Abstract
The invention relates to a method for preparing pure iron, belonging to the technical field of metallurgy. The method comprises the following steps: (1) utilizing super iron ore concentrate as a raw material ore; (2) rolling the super iron ore concentrate into pellets; (3) uniformly mixing a reducing agent with a desulfurizing agent, mixing the mixture with the pellets, and carrying out selective reduction, so as to obtain reduced iron blocks; and (4) mixing the reduced iron blocks with ferrous oxide, carrying out electrothermal smelting, and casting, so as to obtain pure iron. According to the method, complex operations, including oxygen blasting and the like, with high equipment requirements are omitted, and the reduction smelting can be directly carried out, so that the cost can be substantially lowered, and the prepared pure iron is high in purity and low in carbon content.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of method preparing pure iron.
Background technology
Pure iron is one of engineering materials of wanting of Modern Heavy, of many uses; Meanwhile, pure iron is the base-material of magneticsubstance, Clean Steel, amorphous material production; Pure iron is divided into technically pure iron (containing C≤0.020%, Fe ≮ 99.50%), pure iron (containing C≤0.0050%, Fe ≮ 99.90%) and ultra pure iron (containing C≤0.0050%, Fe ≮ 99.98%) according to its chemical composition; Technically pure iron comprises pure iron as raw material (YT class) and electrical pure iron (DT class).
Pure iron is of many uses, and its production cost and price are the determinatives affecting pure iron, ultra pure iron use territory and use consumption; Only there is technically pure iron suitability for industrialized production in China, and pure iron and ultra pure iron do not have suitability for industrialized production enterprise, mainly relies on high price import for the pure iron of the development of experimental study and exotic materials and ultra pure iron; And the method cost that China prepares pure iron is at present very high, the method for external comparative maturity is also electrolytic process and chemical method substantially, and flow process complex apparatus requires high; Therefore developing a kind of pure iron preparation method of low cost, is the current urgent problem of China.
Summary of the invention
For the problems referred to above that existing pure iron technology of preparing exists, the invention provides a kind of method preparing pure iron, employing extraction of superpure concentrate of magnetite is raw material, iron block is made through selectivity low-temperature reduction, then through melting, at minimizing cost, on the basis of simple flow, obtain high purity low-carbon (LC) pure iron.
Method of the present invention is carried out according to the following steps:
1, adopt extraction of superpure concentrate of magnetite to be Raw Ore, the Iron grade of described extraction of superpure concentrate of magnetite is 71.5 ~ 72%, SiO
2weight content be 0.1 ~ 0.3%;
2, Raw Ore is pressed into the pelletizing of particle diameter 20 ~ 40mm;
3, reductive agent and desulphurizer mixing are evenly made compound, put into reduction furnace after again being mixed by pelletizing with compound, compound covers pelletizing, and sweetening agent is 3 ~ 5% of pelletizing gross weight; Then whole material is heated to 1000 ~ 1150 DEG C, insulation 8 ~ 10h carries out selective reduction, obtains reduction iron block; Described reductive agent is noncoking coal;
4, clean out after being taken out by reduction iron block, then carry out electric melting with electrothermal oven after mixing with iron protoxide, remove the impurity produced in fusion process, finally casting obtains pure iron; Wherein iron protoxide is 3 ~ 5% of reduction iron block gross weight.
Above-mentioned noncoking coal selects bituminous coal, brown coal or hard coal.
Above-mentioned reduction furnace is direct-reduction stove, selects coal-based shaft furnace or tunnel furnace.
Induction furnace selected by above-mentioned electrothermal oven.
By weight percentage containing Fe97.5 ~ 99.5% in above-mentioned reduction iron block, C0.2 ~ 1.5%, O0.2 ~ 1.5%, surplus is other impurity.
Above-mentioned sweetening agent is Wingdale.
Above-mentioned reduction iron block is spongy.
The pure iron that aforesaid method obtains contains Fe >=99.50% by weight percentage, containing C≤0.0050%.
Principle of the present invention is: by adopting extraction of superpure concentrate of magnetite to be raw material, the impurity in raw material is reduced; Then carry out direct-reduction with low temperature, in reduction process, can be reduced into metallic iron in iron mineral, simultaneously in extraction of superpure concentrate of magnetite, the relict element such as Si, Mn, V, Ti, Cr and B is not reduced, and does not thus enter metallographic phase, reaches the effect of selective reduction; Owing to containing carbon in reduction iron block, therefore carbon need be removed further during melting; Therefore can control the reduction ratio in reduction process, make to retain part iron protoxide in reduction iron block, in fusion process, iron protoxide is directly as decarburizer; When reduction ratio is higher cause ferrous oxide content lower time, carry out decarburization by adding iron protoxide; Unreacted iron protoxide forms impurity after melting.
Method of the present invention is compared with existing pure iron technology of preparing, do not need to carry out the complicated and operation that equipment requirements is high such as oxygen blast, directly carry out retailoring, can significantly reduce costs, the pure iron purity of preparation is high, carbon content is low, according to the requirement of user to product, can adopt the operations such as BOTTOM ARGON BLOWING refining, esr, vacuum outgas, or adopt combined production process refining, to ensure the stable of the chemical composition of product.
Embodiment
The method preparation of the extraction of superpure concentrate of magnetite adopted in the embodiment of the present invention for adopting publication number a kind of magnetic separation-reverse flotation disclosed in the patent of 103861733A to prepare extraction of superpure concentrate of magnetite.
The bituminous coal adopted in the embodiment of the present invention, brown coal, hard coal and Wingdale are commercial products, and granularity is≤2mm.
The iron protoxide adopted in the embodiment of the present invention is commercial products, purity >=95%.
The reduction furnace adopted in the embodiment of the present invention selects coal-based shaft furnace or tunnel furnace.
Testing iron level accepted standard in the embodiment of the present invention is GB/T-6730.70-2013.
Induction furnace selected by electrothermal oven in the embodiment of the present invention.
Oxygen element in reduction iron block in the present invention exists with the form of the oxide compound of iron.
Embodiment 1
Employing extraction of superpure concentrate of magnetite is Raw Ore, and the Iron grade of described extraction of superpure concentrate of magnetite is 71.5%, SiO
2weight content be 0.3%;
Raw Ore is pressed into the pelletizing of particle diameter 20mm;
Reductive agent and desulphurizer mixing are evenly made compound, puts into reduction furnace after again being mixed by pelletizing with compound, compound covers pelletizing, and sweetening agent is 3% of pelletizing gross weight; Then whole material is heated to 1000 DEG C, insulation 10h carries out selective reduction, obtains spongiform reduction iron block; Described reductive agent is bituminous coal; By weight percentage containing Fe97.5%, C1%, O1% in described reduction iron block, surplus is other impurity; Described sweetening agent is Wingdale;
Clean out after being taken out by reduction iron block, then carry out electric melting with electrothermal oven after mixing with iron protoxide, remove the impurity produced in fusion process, finally casting obtains pure iron; Wherein iron protoxide is 3 ~ 5% of reduction iron block gross weight;
The pure iron obtained contains Fe99.55% by weight percentage, containing C0.0048%.
Embodiment 2
Method is with embodiment 1, and difference is:
(1) Iron grade of extraction of superpure concentrate of magnetite is 71.8%, SiO
2weight content be 0.2%;
(2) Raw Ore is pressed into the pelletizing of particle diameter 30mm;
(3) sweetening agent is 4% of pelletizing gross weight; Whole material is heated to 1100 DEG C, and insulation 9h carries out selective reduction; Reductive agent is brown coal; By weight percentage containing Fe98.3%, C0.6%, O0.4% in reduction iron block, surplus is other impurity;
(4) iron protoxide added during electric melting is 4% of reduction iron block gross weight;
(5) pure iron is by weight percentage containing Fe99.60%, containing C0.0044%.
Embodiment 3
Method is with embodiment 1, and difference is:
(1) Iron grade of extraction of superpure concentrate of magnetite is 72%, SiO
2weight content be 0.1%;
(2) Raw Ore is pressed into the pelletizing of particle diameter 40mm;
(3) sweetening agent is 5% of pelletizing gross weight; Whole material is heated to 1150 DEG C, and insulation 8h carries out selective reduction; Reductive agent is hard coal; By weight percentage containing Fe99.5%, C0.2%, O0.2% in reduction iron block, surplus is other impurity;
(4) iron protoxide added during electric melting is 5% of reduction iron block gross weight;
(5) pure iron is by weight percentage containing Fe99.63%, containing C0.0041%.
Claims (6)
1. prepare a method for pure iron, it is characterized in that carrying out according to the following steps:
(1) adopt extraction of superpure concentrate of magnetite to be Raw Ore, the Iron grade of described extraction of superpure concentrate of magnetite is 71.5 ~ 72%, SiO
2weight content be 0.1 ~ 0.3%;
(2) Raw Ore is pressed into the pelletizing of particle diameter 20 ~ 40mm;
(3) reductive agent and desulphurizer mixing are evenly made compound, put into reduction furnace after again being mixed by pelletizing with compound, compound covers pelletizing, and sweetening agent is 3 ~ 5% of pelletizing gross weight; Then whole material is heated to 1000 ~ 1150 DEG C, insulation 8 ~ 10h carries out selective reduction, obtains reduction iron block; Described reductive agent is noncoking coal;
(4) clean out after being taken out by reduction iron block, then carry out electric melting with electrothermal oven after mixing with iron protoxide, remove the impurity produced in fusion process, finally casting obtains pure iron; Wherein iron protoxide is 3 ~ 5% of reduction iron block gross weight.
2. a kind of method preparing pure iron according to claim 1, is characterized in that described noncoking coal selects bituminous coal, brown coal or hard coal.
3. a kind of method preparing pure iron according to claim 1, is characterized in that C0.2 ~ 1.5%, O0.2 ~ 1.5%, surplus is other impurity by weight percentage containing Fe97.5 ~ 99.5% in described reduction iron block.
4. a kind of method preparing pure iron according to claim 1, is characterized in that described sweetening agent is Wingdale.
5. a kind of method preparing pure iron according to claim 1, is characterized in that described reduction iron block is spongy.
6. a kind of method preparing pure iron according to claim 1, is characterized in that described pure iron by weight percentage containing Fe >=99.50%, containing C≤0.0050%.
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| CN201510555730.2A CN105063264B (en) | 2015-09-02 | 2015-09-02 | A kind of method for preparing pure iron |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925743A (en) * | 2016-05-13 | 2016-09-07 | 东北大学 | Method for preparing ultrapure iron through gas base vertical furnace direct reduction of ultrahigh-grade iron concentrate |
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 |
-
2015
- 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925743A (en) * | 2016-05-13 | 2016-09-07 | 东北大学 | Method for preparing ultrapure iron through gas base vertical furnace direct reduction of ultrahigh-grade iron concentrate |
| CN105925743B (en) * | 2016-05-13 | 2018-09-14 | 东北大学 | A kind of gas-based shaft kiln directly reduced method for producing ultra pure iron of super high grade iron concentrate |
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| CN105063264B (en) | 2017-05-31 |
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