CN103509940A - Carbon containing pellet for producing low-sulfur grained iron - Google Patents
Carbon containing pellet for producing low-sulfur grained iron Download PDFInfo
- Publication number
- CN103509940A CN103509940A CN201210204237.2A CN201210204237A CN103509940A CN 103509940 A CN103509940 A CN 103509940A CN 201210204237 A CN201210204237 A CN 201210204237A CN 103509940 A CN103509940 A CN 103509940A
- Authority
- CN
- China
- Prior art keywords
- iron
- low
- mgo
- sulfur
- manufacture
- 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.)
- Granted
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a carbon containing pellet for producing low-sulfur grained iron, the carbon containing pellet comprises the following components: 50%-70% of an iron containing raw material, 15%-35% of a carbon containing raw material, 2%-5% of an additive and 0%-5% of a binder, wherein the molar ratio of fixed carbon in the total pellet raw materials to iron oxide oxygen atoms in the iron containing raw material is controlled to satisfy (C / O) = 1.1-1.2, the carbon containing pellet also comprises 5%-15% of one of CaO containing substances and 0%-3% of one of MgO containing substances, and ([CaO]+ [MgO]) / ([SiO2] + [Al2O3]) = 0.95-1.20 and [MgO]/ [Al2O3] = 0.85-1.15 are satisfied. The self-reduction carbon containing pellet of the invention is used for horizontal-moving-bed reducing process, is low in baking temperature, can effectively reduce the energy consumption and equipment maintenance costs, and can obtain the low-sulfur grained iron with the sulfur content of less than 0.04% so as to further improve the quality of a product.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate generally to the carbonaceous pelletizing for smelting iron and steel, particularly horizontal moving bed reducing process is manufactured low sulfur content granulated iron autoreduction carbonaceous pelletizing used.
Background technology
Carbonaceous pelletizing typically refers to by iron content powder (as iron ore powder etc.) and is equipped with certain fine particles containing carbon (as coal dust, coke powder etc.) and suitable binding agent, the ball-type agglomerate of a kind of carbon containing iron content of making by ball press or pelletizer after sufficiently mixing.In ferrous metallurgy neck city, different metallurgical technologies, also different to the requirement of carbonaceous pelletizing and purposes.In non-blast furnace ironmaking field, use carbonaceous pelletizing to produce direct-reduced iron or granulated iron, be characterized in without coke, and speed of response is fast, especially use carbonaceous pelletizing to prepare granulated iron, can in high temperature reduction furnace, a step realize the separation of slag iron, directly obtain highly purified granulated iron, for steel-making, developed at present relatively small-scale iron smelting method.In documents and materials, introduce the laboratory study that more granulated iron manufacture method mainly contains ITmk3, HI-Qip and domestic Ji Suo universities and colleges, iron content powders (as iron ore powder etc.) and the carbon containing reducer (as coal dust, coke powder etc.) of adopting more, briquetting or pelletizing are made carbonaceous pelletizing after sufficiently mixing, usage level moving-bed reduction furnace (as rotary hearth furnace, pallet car type reduction furnace etc.) reduces, realize metallic iron separated with slag, after the coalescent and cooling curing of metallic iron, make granulated iron.
At existing carbonaceous pelletizing, prepare in granulated iron method, the sulphur content of the granulated iron of acquisition is generally higher, thereby has reduced the quality of granulated iron.In the granulated iron of preparing as ITmk3 technique, sulphur content is at 0.05 ~ 0.11%(farmland on a plateau filial piety husband Deng，XinIron source プ ロ セ ス development, refreshing Kobe System Steel skill Reported, and 2005,55:128-132); In granulated iron prepared by HI-Qip technique, sulphur content surpasses 0.2%(Ze Righteousness filial piety etc., and Hi-QIP プ ロ セ ス (new Li Iron System makes プ ロ セ ス) development, JFE skill Reported, and 2008,22:73-78).For reducing the sulphur content of granulated iron, Japanese Patent " granulated metal Iron System making method " (Te Open 2009-7621) announced a kind of preparation method of low-sulfur granulated iron, it is characterized in that by suitably allocating in mixing raw material containing the material of MgO with containing Na
2o, K
2o or Li
2the material of O, and the basicity of slag is adjusted in 1.4～2.3 scopes, and make Na in slag
2o content is greater than 0.10%, or K
2o content is greater than 0.10%, or Li
2o content is greater than 0.05%, can make the sulphur content in granulated iron be reduced to below 0.08%; Japanese Patent " granulated metal Iron System making method " (Te Open 2009-7620) by regulate in raw mixture containing CaO, MgO, SiO
2amount of substance, makes basicity of slag (CaO+MgO)/SiO
2for 1.5-2.2 and MgO content (MgO) are 13-25%, can make the sulphur content in granulated iron be reduced to below 0.08%; Japanese Patent " granulated metal Iron System making method " (Te Open 2009-7619) by regulate in raw mixture containing CaO, MgO, SiO
2amount of substance, makes basicity of slag (CaO+MgO)/SiO
2for 1.3-2.3, and allocate into surpass 0.03% content at least one fusing point lower than 1400 ℃ of alkalimetal oxides, can make the sulphur content in granulated iron be reduced to below 0.05%; In addition, Chinese patent " for the preparation method of granulated metal iron " (CN1761762A) has also been announced a kind of method that reduces granulated iron sulphur content, it is characterized in that by regulate in raw mixture containing CaO, MgO, SiO
2amount of substance, makes basicity of slag (CaO+MgO)/SiO
2for 1.3-2.3 and MgO content (MgO) are 5-13%, can make the sulphur content in granulated iron be reduced to below 0.05%.
In aforesaid method, in order to control the sulphur content in granulated iron, often adjust component in raw material and make basicity (CaO/SiO
2or (CaO+MgO)/SiO
2) reach higher value, although granulated iron control sulphur is produced effect, also cause slag melting to raise simultaneously, so that carbonaceous pelletizing generally need higher maturing temperature (>=1450 ℃) could realize scum molten minute; On the other hand, people wish that the sulphur content of obtained granulated iron product can further reduce.
Summary of the invention
The object of the present invention is to provide a kind of autoreduction carbonaceous pelletizing that horizontal moving bed reducing process is manufactured granulated iron that is applicable to, can realize under lower maturing temperature can slag iron molten minute, obtains and have sulphur content lower than 0.04% high-quality granulated iron.
The present invention seeks to that technical scheme by below realizes:
The present invention is iron-bearing material 50% ~ 70%, carbon raw material 15% ~ 35%, additive 2% ~ 5%, binding agent 0% ~ 5% for the manufacture of the composition mass percent of the carbonaceous pelletizing of low-sulfur granulated iron, in control pelletizing total raw material, in fixed carbon and iron-bearing material, the Sauerstoffatom mol ratio of ferriferous oxide meets (C/O)=1.1 ~ 1.2, also be furnished with 5% ~ 15% containing a kind of in CaO material and 0% ~ 3% a kind of containing in MgO material, and satisfied ([CaO]+[MgO])/([SiO
2]+[Al
2o
3])=0.95 ~ 1.20 and [MgO]/[Al
2o
3]=0.85 ~ 1.15.
Various raw material of the present invention is Powdered, and the ratio that particle diameter is less than 0.074mm reaches more than 70%; Described iron-bearing material is one or more in fine iron breeze, iron scale and ion dust mud contaning; Described carbon raw material is one or more in coal dust, coke powder and blast furnace dust; The fixed carbon content of described coal dust is greater than 70%, and sulphur content is less than 1%; Described is a kind of in unslaked lime, slaked lime or Wingdale containing CaO material; Described is a kind of in rhombspar or wagnerite containing MgO material; Described additive is Fluorspar Powder, its CaF
2content is greater than 90%; Described binding agent is one or both in wilkinite, water glass.
Carbonaceous pelletizing of the present invention adopts universal method manufacture: first according to its Chemical Composition, prepare burden, and solid materials is carried out to fragmentation and roll and reach desired particle size, then pressed powder material being put into mixer is uniformly mixed, after mixing, inject suitable quantity of water or liquid adhesive and be again uniformly mixed, after mixing, final mixture being sent in ball press, being pressed into pelletizing, after pelletizing is dry, become carbonaceous pelletizing of the present invention.
In horizontal moving bed reducing process, use autoreduction carbonaceous pelletizing of the present invention, maturing temperature is only 1340-1440 ℃, effectively reduce energy expenditure and equipment maintenance cost, and obtained the low sulfur content granulated iron of sulphur content < 0.04%, thereby further improved quality product.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
Fine iron breeze 61%, coal dust (carbon content 72.5%, sulphur content 0.8%) 21%, Fluorspar Powder (CaF by mass percentage
2content 93%) 5%, limestone powder 13% prepares burden, and controls (C/O)=1.1 in chemical composition, ([CaO]+[MgO])/([SiO
2]+[Al
2o
3])=1.13, [MgO]/[Al
2o
3]=0.91.Solid materials (ratio that particle diameter is less than 0.074mm is 80%) is put into mixer to be uniformly mixed, after mixing, inject suitable quantity of water and be again uniformly mixed, after mixing, final mixture material is sent in ball press, be pressed into pelletizing, after pelletizing is dry, become carbonaceous pelletizing of the present invention.Described carbonaceous pelletizing is used for to pallet car type reduction furnace technique, 1350 ℃ of Heating temperatures, recovery time 20min, can obtain 3 ~ 30mm granulated iron, and the sulphur content of gained granulated iron is 0.022%.
Embodiment 2
Ion dust mud contaning 8%, iron scale 44%, blast furnace dust 34%, calcium lime powder 6% by mass percentage, Fluorspar Powder (CaF
2content 92.5%) 4%, water glass 4% prepares burden, and controls (C/O)=1.1 in chemical composition, ([CaO]+[MgO])/([SiO
2]+[Al
2o
3])=0.96, [MgO]/[Al
2o
3]=0.87.First solid materials (ratio that particle diameter is less than 0.074mm is 72%) being put into mixer is uniformly mixed, after mixing, drop into water glass and be again uniformly mixed, after mixing, final mixture is sent in ball press, be pressed into pelletizing, after pelletizing is dry, become carbonaceous pelletizing of the present invention.Carbonaceous pelletizing is used for to pallet car type continuous reduction furnace technique, 1380 ℃ of Heating temperatures, recovery time 20min, can obtain 3 ~ 30mm granulated iron, and the sulphur content of gained granulated iron is 0.028%.
Embodiment 3
Fine iron breeze 64%, coke powder 16%, Fluorspar Powder (CaF by mass percentage
2content 93%) 2.5%, wilkinite 5%, limestone powder 10%, ground dolomite 2.5% prepare burden, and controls (C/O)=1.2 in chemical composition, ([CaO]+[MgO])/([SiO
2]+[Al
2o
3])=1.03, [MgO]/[Al
2o
3]=0.97.Solid materials (ratio that particle diameter is less than 0.074mm is 75%) is put into mixer to be uniformly mixed, after mixing, inject suitable quantity of water and be again uniformly mixed, after mixing, final mixture material is sent in ball press, be pressed into pelletizing, after pelletizing is dry, become carbonaceous pelletizing of the present invention.Carbonaceous pelletizing is used for to pallet car type continuous reduction furnace technique, 1380 ℃ of Heating temperatures, recovery time 20min, can obtain 3 ~ 30mm granulated iron, and the sulphur content of gained granulated iron is 0.034%.
Embodiment 4
Ion dust mud contaning 20%, iron scale 49%, coke powder 17%, Fluorspar Powder (CaF by mass percentage
2content 92.5%) 4.5%, slaked lime powder 8.5%, magnesite stone flour 1% prepare burden, and controls (C/O)=1.1 in chemical composition, ([CaO]+[MgO])/([SiO
2]+[Al
2o
3])=1.15, [MgO]/[Al
2o
3]=1.12.Solid materials (ratio that particle diameter is less than 0.074mm is 72%) is put into mixer to be uniformly mixed, after mixing, inject suitable quantity of water and be again uniformly mixed, after mixing, final mixture material is sent in ball press, be pressed into pelletizing, after pelletizing is dry, become carbonaceous pelletizing of the present invention.Carbonaceous pelletizing is used for to pallet car type continuous reduction furnace technique, 1400 ℃ of Heating temperatures, recovery time 20min, can obtain 3 ~ 30mm granulated iron, and the sulphur content of gained granulated iron is 0.019%.
Claims (9)
1. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron, it is characterized in that it forms mass percent is iron-bearing material 50% ~ 70%, carbon raw material 15% ~ 35%, additive 2% ~ 5%, binding agent 0% ~ 5%, in control pelletizing total raw material, in fixed carbon and iron-bearing material, the Sauerstoffatom mol ratio of ferriferous oxide meets (C/O)=1.1 ~ 1.2, also be furnished with 5% ~ 15% containing a kind of in CaO material and 0% ~ 3% a kind of containing in MgO material, and satisfied ([CaO]+[MgO])/([SiO
2]+[Al
2o
3])=0.95 ~ 1.20 and [MgO]/[Al
2o
3]=0.85 ~ 1.15.
2. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1, is characterized in that described various raw materials are Powdered, and the ratio that particle diameter is less than 0.074mm reaches more than 70%.
3. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1 and 2, is characterized in that described iron-bearing material is one or more in fine iron breeze, iron scale and ion dust mud contaning.
4. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1 and 2, is characterized in that described carbon raw material is one or more in coal dust, coke powder and blast furnace dust.
5. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 4, is characterized in that the fixed carbon content of described coal dust is greater than 70%, and sulphur content is less than 1%.
6. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1 and 2, is characterized in that described is a kind of in unslaked lime, slaked lime or Wingdale containing CaO material.
7. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1 and 2, is characterized in that described is a kind of in rhombspar or wagnerite containing MgO material.
8. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1 and 2, is characterized in that described additive is Fluorspar Powder, its CaF
2content is greater than 90%.
9. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1 and 2, is characterized in that described binding agent is one or both in wilkinite, water glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210204237.2A CN103509940B (en) | 2012-06-20 | 2012-06-20 | Carbon containing pellet for producing low-sulfur grained iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210204237.2A CN103509940B (en) | 2012-06-20 | 2012-06-20 | Carbon containing pellet for producing low-sulfur grained iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103509940A true CN103509940A (en) | 2014-01-15 |
| CN103509940B CN103509940B (en) | 2015-04-08 |
Family
ID=49893369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210204237.2A Active CN103509940B (en) | 2012-06-20 | 2012-06-20 | Carbon containing pellet for producing low-sulfur grained iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103509940B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105969925A (en) * | 2016-07-14 | 2016-09-28 | 北京科技大学 | Smelting technique capable of controlling carburization quantity of pig iron |
| CN106414778A (en) * | 2014-05-15 | 2017-02-15 | 株式会社神户制钢所 | Production method of granular metallic iron |
| CN106435168A (en) * | 2016-11-29 | 2017-02-22 | 江苏省冶金设计院有限公司 | Method for preparing and reducing pellets |
| US20180209012A1 (en) * | 2015-05-28 | 2018-07-26 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Reduced iron manufacturing method |
| WO2020087593A1 (en) * | 2018-10-29 | 2020-05-07 | 北京科技大学 | Preparation method for self-fluxing composite pellet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775452A (en) * | 2010-02-02 | 2010-07-14 | 河北龙凤山铸业有限公司 | Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
-
2012
- 2012-06-20 CN CN201210204237.2A patent/CN103509940B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775452A (en) * | 2010-02-02 | 2010-07-14 | 河北龙凤山铸业有限公司 | Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106414778A (en) * | 2014-05-15 | 2017-02-15 | 株式会社神户制钢所 | Production method of granular metallic iron |
| US20180209012A1 (en) * | 2015-05-28 | 2018-07-26 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Reduced iron manufacturing method |
| US10683562B2 (en) * | 2015-05-28 | 2020-06-16 | Kobe Steel, Ltd. | Reduced iron manufacturing method |
| CN105969925A (en) * | 2016-07-14 | 2016-09-28 | 北京科技大学 | Smelting technique capable of controlling carburization quantity of pig iron |
| CN105969925B (en) * | 2016-07-14 | 2019-01-08 | 北京科技大学 | A kind of smelting process of controllable pig iron carburizing amount |
| CN106435168A (en) * | 2016-11-29 | 2017-02-22 | 江苏省冶金设计院有限公司 | Method for preparing and reducing pellets |
| WO2020087593A1 (en) * | 2018-10-29 | 2020-05-07 | 北京科技大学 | Preparation method for self-fluxing composite pellet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103509940B (en) | 2015-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101903438B1 (en) | Non-roasting Pellet Composition Prepared By Using Melted Iron slags and Melted Iron Process By-products, and Pellet Preparation Method | |
| CN101270410A (en) | Cold bonded pellet and method of producing the same | |
| CN108950189B (en) | method for producing MgO-containing sintered ore by using waste magnesia carbon bricks | |
| CN102912068B (en) | Slagging agent for semisteel converter steelmaking and manufacturing method thereof | |
| CN103509940B (en) | Carbon containing pellet for producing low-sulfur grained iron | |
| CA2497614A1 (en) | A slag conditioner composition, process for manufacture and method of use in steel production | |
| CN104131130B (en) | Converter final slag modifier and application thereof | |
| CN101244835B (en) | Preliminary melting type calcium aluminate for ultra-clean steel and method of manufacturing the same | |
| CN102071283A (en) | Boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking | |
| CN105219907A (en) | The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection | |
| WO2011021577A1 (en) | Unfired carbon-containing agglomerate for blast furnaces and production method therefor | |
| CN102296153A (en) | Novel premelting dephosphorization agent for steel making and preparation method thereof | |
| CN110894575A (en) | Composite binder for low-alkalinity magnesium pellets and preparation method and application thereof | |
| CN104278146B (en) | A kind of sintering flux preparation method for iron ore sintering | |
| CN103160302B (en) | Processing method of metallurgical dust mud containing iron carbon zinc | |
| CN1190507C (en) | Composite ball rolls of manganese and its preparation method | |
| CN102653822B (en) | Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof | |
| CN102839252B (en) | Converter slag fluoride-free fusing agents and method for producing the same | |
| CN102787188A (en) | Process for smelting vanadium-containing pig iron by high-silicon vanadium titanomagnetite concentrate powder | |
| CN101353711B (en) | Carbonaceous material block molten iron bath reduction ironmaking desulphurization method | |
| CN101660064A (en) | Technique for preparing nickel-iron alloy | |
| CN101671756B (en) | Composite fluxing medium for revolving furnace | |
| CN106467935A (en) | A kind of copper ashes and the Application way of carbide slag | |
| CN102899483B (en) | A kind of recycling technique of LF furnace refining slag | |
| CN111154934A (en) | Furnace burden structure ratio for adjusting blast furnace slag MgO |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |