CN102121059A - Method for directly making iron and producing sulfuric acid by using pyrite - Google Patents
Method for directly making iron and producing sulfuric acid by using pyrite Download PDFInfo
- Publication number
- CN102121059A CN102121059A CN2011100271014A CN201110027101A CN102121059A CN 102121059 A CN102121059 A CN 102121059A CN 2011100271014 A CN2011100271014 A CN 2011100271014A CN 201110027101 A CN201110027101 A CN 201110027101A CN 102121059 A CN102121059 A CN 102121059A
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- China
- Prior art keywords
- iron
- sulfuric acid
- slag
- iron ore
- pyrite
- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for directly making iron and producing sulfuric acid by using pyrite, and relates to the field of pyrite iron-making processes. The method comprises the following steps of: putting the pyrite containing 15 to 50 percent of sulfur and 30 to 60 percent of iron into an oxidation furnace under the environment of oxygen rich air containing 25 to 80 percent of oxygen, burning the pyrite to generate iron slag and SO2 flue gas, then preparing sulfuric acid from the SO2 flue gas, putting the iron slag and coal or coke into a reduction furnace, performing reduction combustion to generate a mixture of molten iron and slag, finally demixing the molten iron and the slag, and preparing pig iron from the molten iron. Compared with the traditional iron-making process, the flow of the iron-making process is greatly simplified, the land for concentration is saved, and the construction investment is saved; and the SO2 flue gas serving as an iron-making byproduct can be prepared into the sulfuric acid, so the additional value of the product is improved, the energy is saved, the emission of SO2 tail gas is reduced, and the development of circular economy is promoted.
Description
Technical field
The present invention relates to sulfurous iron ore iron-smelting process field, relate in particular to a kind of sulfurous iron ore direct ironmaking co-producing sulfuric acid technology.
Background technology
At present, existing iron smelting method mainly adopts the iron ore of sulfur-bearing≤0.5% to carry out blast furnace iron-making process as raw material, the main dependence on import of iron ore, and price is higher; Or adopt the iron-containing slag of sulfurous iron ore after roasting to carry out the pelletizing agglomeration, and then enter blast-furnace smelting, technical process is longer, and cost is higher.
Summary of the invention
The object of the invention is to design a kind of method of sulfurous iron ore direct ironmaking co-producing sulfuric acid.
Technical solution of the present invention is: under the environment of the oxygen-rich air that contains oxygen 25%～80%, with sulphur 15%～50%, and the sulfurous iron ore of iron content 30%～60% drops into 700 ℃～1100 ℃ oxidized still burning generation iron ore slag and SO
2Flue gas is then with SO
2Flue gas is made sulfuric acid, is the mixture that the reduction burning generates molten iron and slag in 1000 ℃～2000 ℃ the reduction furnace with iron ore slag and coal or the burnt temperature that drops into, and with molten iron and slag layering, gets molten iron and makes the pig iron at last.
Sulfurous iron ore of the present invention and oxygen-rich mixture carry out abundant combustion reactions in oxidized still after, generate ferric oxide and SO
2Flue gas, the SO of generation
2Flue gas enters the sulfuric acid apparatus co-producing sulfuric acid after the sidepiece (or top) of oxidized still is discharged.Chemical equation is: 4FeS
2+ 11O
2=2Fe
2O
3+ 8SO
2↑, Fe
2O
3+ 3SO
2=2Fe+3SO
3↑, 2FeS
2+ 11SO
3=Fe
2O
3+ 15SO
2↑, the temperature in the stove is 700 ℃～1100 ℃.
Iron ore slag and coal or Jiao enter and reduce burning in the reduction furnace, and ferric oxide and coke further react and generate Fe and CO
2, chemical equation is: 3C+2Fe
2O
3=4Fe+3CO
2↑, the temperature in the reduction furnace up to 1000 ℃～2000 ℃, iron (Fe) and slag are in molten state fully, are discharged respectively by the overflow port of reduction furnace after iron (Fe) and the slag layering, directly generate the pig iron.
Superiority of the present invention be embodied in following some:
1, compares with traditional iron-smelting process, simplified the iron-smelting process flow process greatly, save construction land, save construction investment.
2, ironmaking by-product SO
2Flue gas can be made sulfuric acid, improves added value of product.
3, save energy reduces SO
2Exhaust emissions promotes recycling economy development.
In order to make reaction more fully, fast, improve the rate of tapping a blast furnace, described sulfurous iron ore and coal or the burnt mass ratio that feeds intake are 100～65 ︰ 1～25.
Slag making for the benefit of, and with slag and molten iron layering, the present invention also should also drop into small amount of limestone in reduction furnace.
Preferred described sulfurous iron ore and Wingdale, coal or the burnt mass ratio that feeds intake are 65 ︰, 10 ︰ 25.
Embodiment
One, get the raw materials ready:
Get the oxygen-rich air that contains oxygen 25%～80% ready.
Sulfurous iron ore and Wingdale, coal or burnt mass ratio 65 ︰ 10 ︰ 25 weighings respectively that feed intake with sulphur 15%～50%, iron content 30%～60%.
Two, operation:
Controlled oxidation stove internal combustion temperature is 700 ℃～1100 ℃, feeds oxygen-rich air from furnace bottom, adds sulfurous iron ore continuously from the furnace side.
Fully after the combustion reactions, the iron ore slag is discharged from the furnace side, the SO of generation
2Flue gas enters the sulfuric acid apparatus co-producing sulfuric acid after discharging from air outlet, furnace side (or furnace roof).
Iron ore slag and Wingdale, coal or burnt mixture add reduction furnace continuously, and control stove internal combustion temperature is 1000 ℃～2000 ℃.
Fully after the combustion reactions, after molten iron and slag layering, the upper strata scum silica frost is discharged from the body of heater slag notch, and the molten iron of lower floor is discharged from iron notch, directly generates the pig iron.
Claims (4)
1. the method for a sulfurous iron ore direct ironmaking co-producing sulfuric acid is characterized in that: under the environment of the oxygen-rich air that contains oxygen 25%～80%, with sulphur 15%～50%, and the sulfurous iron ore of iron content 30%～60% drops into 700 ℃～1100 ℃ oxidized still burning and generates iron ore slag and SO
2Flue gas is then with SO
2Flue gas is made sulfuric acid, is the mixture that the reduction burning generates molten iron and slag in 1000 ℃～2000 ℃ the reduction furnace with iron ore slag and coal or the burnt temperature that drops into, and with molten iron and slag layering, gets molten iron and makes the pig iron at last.
2. according to the method for the described sulfurous iron ore direct ironmaking of claim 1 co-producing sulfuric acid, it is characterized in that described sulfurous iron ore and coal or the burnt mass ratio that feeds intake are 100～65 ︰ 1～25.
3. according to the method for the described sulfurous iron ore direct ironmaking of claim 1 co-producing sulfuric acid, it is characterized in that in reduction furnace, also dropping into Wingdale.
4. according to the method for the described sulfurous iron ore direct ironmaking of claim 3 co-producing sulfuric acid, it is characterized in that described sulfurous iron ore and Wingdale, coal or the burnt mass ratio that feeds intake are 65 ︰, 10 ︰ 25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100271014A CN102121059A (en) | 2011-01-26 | 2011-01-26 | Method for directly making iron and producing sulfuric acid by using pyrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100271014A CN102121059A (en) | 2011-01-26 | 2011-01-26 | Method for directly making iron and producing sulfuric acid by using pyrite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102121059A true CN102121059A (en) | 2011-07-13 |
Family
ID=44249725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100271014A Pending CN102121059A (en) | 2011-01-26 | 2011-01-26 | Method for directly making iron and producing sulfuric acid by using pyrite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102121059A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586618A (en) * | 2012-03-31 | 2012-07-18 | 长沙有色冶金设计研究院有限公司 | Process of smelting iron pyrite |
| WO2014183807A1 (en) | 2013-05-17 | 2014-11-20 | BLüCHER GMBH | Method and plant for processing roasted pyrites |
| WO2014183808A1 (en) | 2013-05-17 | 2014-11-20 | BLüCHER GMBH | Method and plant for producing iron from roasted pyrites |
| CN112322818A (en) * | 2020-10-29 | 2021-02-05 | 钢研晟华科技股份有限公司 | Full-oxygen melting reduction iron-making method for high-sulfur iron-containing raw material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4111755A (en) * | 1975-10-30 | 1978-09-05 | Mcdowell-Wellman Engineering Company | Method of producing pelletized fixed sulfur fuel |
| JP2007147135A (en) * | 2005-11-25 | 2007-06-14 | Dowa Holdings Co Ltd | Fluidized bed furnace |
| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN101255482A (en) * | 2008-03-21 | 2008-09-03 | 江阴市尚疯新能源技术开发有限公司 | Method for directly melting iron with iron ore powder or iron ore by using converter |
| CN101457290A (en) * | 2009-01-08 | 2009-06-17 | 云南常青树投资有限公司 | Comprehensive utilization method of middle and low grade ferro-sulphur ore |
-
2011
- 2011-01-26 CN CN2011100271014A patent/CN102121059A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4111755A (en) * | 1975-10-30 | 1978-09-05 | Mcdowell-Wellman Engineering Company | Method of producing pelletized fixed sulfur fuel |
| JP2007147135A (en) * | 2005-11-25 | 2007-06-14 | Dowa Holdings Co Ltd | Fluidized bed furnace |
| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN101255482A (en) * | 2008-03-21 | 2008-09-03 | 江阴市尚疯新能源技术开发有限公司 | Method for directly melting iron with iron ore powder or iron ore by using converter |
| CN101457290A (en) * | 2009-01-08 | 2009-06-17 | 云南常青树投资有限公司 | Comprehensive utilization method of middle and low grade ferro-sulphur ore |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586618A (en) * | 2012-03-31 | 2012-07-18 | 长沙有色冶金设计研究院有限公司 | Process of smelting iron pyrite |
| CN102586618B (en) * | 2012-03-31 | 2013-08-21 | 长沙有色冶金设计研究院有限公司 | Process of smelting iron pyrite |
| WO2014183807A1 (en) | 2013-05-17 | 2014-11-20 | BLüCHER GMBH | Method and plant for processing roasted pyrites |
| WO2014183808A1 (en) | 2013-05-17 | 2014-11-20 | BLüCHER GMBH | Method and plant for producing iron from roasted pyrites |
| CN112322818A (en) * | 2020-10-29 | 2021-02-05 | 钢研晟华科技股份有限公司 | Full-oxygen melting reduction iron-making method for high-sulfur iron-containing raw material |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110713 |