CN103509940B - Carbon containing pellet for producing low-sulfur grained iron - Google Patents
Carbon containing pellet for producing low-sulfur grained iron Download PDFInfo
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- CN103509940B CN103509940B CN201210204237.2A CN201210204237A CN103509940B CN 103509940 B CN103509940 B CN 103509940B CN 201210204237 A CN201210204237 A CN 201210204237A CN 103509940 B CN103509940 B CN 103509940B
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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 manufactures low sulfur content granulated iron autoreduction carbonaceous pelletizing used.
Background technology
Carbonaceous pelletizing typically refers to and is equipped with certain fine particles containing carbon (as coal dust, coke powder etc.) and suitable binding agent by iron content powder (as iron ore powder etc.), after sufficiently mixing, the ball-type agglomerate of a kind of carbon containing iron content made by ball press or pelletizer.In ferrous metallurgy neck city, different metallurgical technologies, also different with purposes to the requirement of carbonaceous pelletizing.Use carbonaceous pelletizing to produce direct-reduced iron or granulated iron in non-blast furnace ironmaking field, be characterized in without coke, and speed of response is fast, especially carbonaceous pelletizing is used to prepare granulated iron, a step slag sluicing system can be realized in high temperature reduction furnace, the highly purified granulated iron of direct acquisition, for steel-making, has developed into relatively small-scale iron smelting method at present.The laboratory study that more granulated iron manufacture method mainly contains ITmk3, HI-Qip and domestic Ji Suo universities and colleges is introduced in documents and materials, many employings iron content powder (as iron ore powder etc.) and carbon containing reducer (as coal dust, coke powder etc.), briquetting or pelletizing make 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 to be separated with slag, metallic iron is coalescent and after cooling curing, obtained granulated iron.
Prepare in granulated iron method at existing carbonaceous pelletizing, the sulphur content of the granulated iron of acquisition is generally higher, thus reduces the quality of granulated iron.If sulphur content in granulated iron prepared by ITmk3 technique is 0.05 ~ 0.11%(farmland on a plateau filial piety husband etc., new iron source プ ロ セ ス development, Shen Kobe System Steel skill Reported, 2005,55:128-132); In granulated iron prepared by HI-Qip technique, sulphur content is more than 0.2%(Ze Righteousness filial piety etc., Hi-QIP プ ロ セ ス (new Li Iron System makes プ ロ セ ス) development, JFE skill Reported, 2008,22:73-78).For reducing the sulphur content of granulated iron, Japanese Patent " granulated metal Iron System making method " (Te Open 2009-7621) disclose 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%, and the sulphur content in granulated iron can be made to be reduced to less than 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 content of MgO (MgO) are 13-25%, the sulphur content in granulated iron can be made to be reduced to less than 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 at least one fusing point allocated into more than 0.03% content is lower than 1400 DEG C of alkalimetal oxides, and the sulphur content in granulated iron can be made to be reduced to less than 0.05%; In addition, Chinese patent " preparation method for granulated metal iron " (CN1761762A) also discloses a kind of method reducing 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 content of MgO (MgO) are 5-13%, the sulphur content in granulated iron can be made to be reduced to less than 0.05%.
In order to control the sulphur content in granulated iron in aforesaid method, often adjusting component in raw material and making basicity (CaO/SiO
2or (CaO+MgO)/SiO
2) reach higher value, although effective to granulated iron control sulphur, also cause slag melting to raise, so that carbonaceous pelletizing generally need higher maturing temperature (>=1450 DEG C) could realize molten point of scum simultaneously; On the other hand, people wish that the sulphur content of obtained granulated iron product can reduce further.
Summary of the invention
The object of the present invention is to provide and be a kind ofly applicable to horizontal moving bed reducing process and manufacture the autoreduction carbonaceous pelletizing of granulated iron, can realize under lower maturing temperature can molten point of slag iron, obtain have sulphur content lower than 0.04% high-quality granulated iron.
The present invention seeks to be realized by technical scheme below:
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, control (C/O)=1.1 ~ 1.2 satisfied with the Sauerstoffatom mol ratio of ferriferous oxide in iron-bearing material of fixed carbon in pelletizing total raw material, also be furnished with 5% ~ 15% containing the one in CaO material and 0% ~ 3% containing the one in MgO material, and meet ([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 one in unslaked lime, slaked lime or Wingdale containing CaO material; Described is one 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 prepare burden according to its Chemical Composition, and solid materials is carried out fragmentation and roll and reach desired particle size, then solid powder material is put into mixer to be uniformly mixed, after mixing, injection suitable quantity of water or liquid adhesive are also uniformly mixed again, sent in ball press by final mixture, be pressed into pelletizing after mixing, after pelletizing drying, namely become carbonaceous pelletizing of the present invention.
Autoreduction carbonaceous pelletizing of the present invention is used in horizontal moving bed reducing process, maturing temperature is only 1340-1440 DEG C, effectively reduce energy expenditure and equipment maintenance cost, and obtain the low sulfur content granulated iron of sulphur content <0.04%, thus further increase 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 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 drying, namely become carbonaceous pelletizing of the present invention.Be used for by described carbonaceous pelletizing in pallet car type reduction furnace technique, Heating temperature 1350 DEG C, 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%) is put into mixer to be 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 drying, namely become carbonaceous pelletizing of the present invention.Be used for by carbonaceous pelletizing in pallet car type continuous reduction furnace technique, Heating temperature 1380 DEG C, 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 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 drying, namely become carbonaceous pelletizing of the present invention.Be used for by carbonaceous pelletizing in pallet car type continuous reduction furnace technique, Heating temperature 1380 DEG C, 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 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 drying, namely become carbonaceous pelletizing of the present invention.Be used for by carbonaceous pelletizing in pallet car type continuous reduction furnace technique, Heating temperature 1400 DEG C, recovery time 20min, can obtain 3 ~ 30mm granulated iron, and the sulphur content of gained granulated iron is 0.019%.
Claims (6)
1. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron, it is characterized in that its composition mass percent is iron-bearing material 50% ~ 70%, carbon raw material 15% ~ 35%, additive 2% ~ 5%, binding agent 0% ~ 5%, control (C/O)=1.1 ~ 1.2 satisfied with the Sauerstoffatom mol ratio of ferriferous oxide in iron-bearing material of fixed carbon in pelletizing total raw material, also be furnished with 5% ~ 15% containing a kind of in CaO material and 0% ~ 3% containing the one 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, described is one in unslaked lime, slaked lime or Wingdale containing CaO material; Described is one in rhombspar or wagnerite containing MgO material; Described additive is Fluorspar Powder, its CaF
2content is greater than 90%.
2. the carbonaceous pelletizing for the manufacture of low-sulfur granulated iron according to claim 1, it is characterized in that described various raw materials are Powdered, 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, it is characterized in that the fixed carbon content of described coal dust is greater than 70%, 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 binding agent is one or both in wilkinite, water glass.
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| CN201210204237.2A CN103509940B (en) | 2012-06-20 | 2012-06-20 | Carbon containing pellet for producing low-sulfur grained iron |
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|---|---|---|---|
| CN201210204237.2A CN103509940B (en) | 2012-06-20 | 2012-06-20 | Carbon containing pellet for producing low-sulfur grained iron |
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| CN103509940A CN103509940A (en) | 2014-01-15 |
| CN103509940B true CN103509940B (en) | 2015-04-08 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6294152B2 (en) * | 2014-05-15 | 2018-03-14 | 株式会社神戸製鋼所 | Manufacturing method of granular metallic iron |
| JP6460531B2 (en) * | 2015-05-28 | 2019-01-30 | 株式会社神戸製鋼所 | Method for producing reduced 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 |
| CN109439896B (en) * | 2018-10-29 | 2020-02-21 | 北京科技大学 | Preparation method of 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 |
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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 |
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