CN104419824A - Material distribution method for producing pre-reduced agglomerate - Google Patents
Material distribution method for producing pre-reduced agglomerate Download PDFInfo
- Publication number
- CN104419824A CN104419824A CN201310398865.3A CN201310398865A CN104419824A CN 104419824 A CN104419824 A CN 104419824A CN 201310398865 A CN201310398865 A CN 201310398865A CN 104419824 A CN104419824 A CN 104419824A
- Authority
- CN
- China
- Prior art keywords
- lump ore
- prereduction
- reduced agglomerate
- reduced
- sintered material
- 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
Abstract
The invention discloses a material distribution method for producing pre-reduced agglomerate. The material distribution method is characterized in that the pre-reduced agglomerate is distributed on two layers, wherein the upper layer of pre-reduced agglomerate accounts for 30%-45% by mass of the total pre-reduced agglomerate; the lower layer of pre-reduced agglomerate accounts for 55%-70% by mass of total pre-reduced agglomerate; lump ore is evenly mixed into the lower layer of pre-reduced agglomerate; the lump ore accounts for 10%-15% by mass of the total pre-reduced agglomerate; and finally pre-reducing sintering is carried out. The lump ore which is relatively high in crystal water absorbs heat at a bottom material layer of the pre-reduced agglomerate, so that excessive fusion of the lower pre-reduced agglomerate caused by addition of relatively much fuel in the pre-reduced agglomerate can be prevented, the gas permeability of the material layer is improved, and the metallurgical performance of the pre-reduced agglomerate is improved; the crystal water in the lamp ore is removed at high temperature, and meanwhile, the lump ore is partially reduced in a reducing atmosphere, so that the metallurgical performance of the lump ore is improved, and the charge rate of the lump ore is increased.
Description
Technical field
The invention belongs to ironmaking production technical field, relate to the production technology of iron-smelting raw material, particularly relate to a kind of distributing process producing prereduced sinter.
Background technology
Iron-smelting energy consumption accounts for 70% of Iron and Steel Production total energy consumption.High basicity sinter and lump ore are the important iron-bearing materials that blast furnace uses, and together form the iron-containing charge structure of blast furnace with acidic oxidation pellet.For improving the energy structure of Iron-smelting, the crude fuel that blast furnace uses must be re-recognized
Prereduced sinter with the addition of reductive agent in raw materials for sintering, reduces while agglomeration, produces the agglomerate of containing metal iron and iron protoxide.Ordinary sinter ore deposit starts slowly to shrink at 1150 DEG C later, and after therefore it enters stove, blast furnace pressure reduction is higher, during more than 1400 DEG C, can sharply shrink, and pressure reduction declines after complete melting.And when using prereduced sinter, the contraction phase before 1400 DEG C is to little, and blast furnace pressure reduction is also little, but can shrink rapidly 1400 DEG C time, and melt completely, high-temperature behavior is good.Therefore, during blast furnace use prereduced sinter, blast furnace soft melt zone reduced thickness, furnace pressure difference reduces, and has very large effect to raising BF Productivity.
Ordinary sinter ore deposit is reduced completely in blast furnace, and its reduction act is strictly by the restriction of carbon hydrogen reduction balance in blast furnace; Prereduced sinter can carry out partial reduction by reductive agent on sinter machine, and its reduction in blast furnace is by CO/CO
2the restriction of molecular balance is less, and therefore the use of prereduced sinter in blast furnace will become an important breakthrough of ironmaking technology.
The important problem producing prereduced sinter is: mixed carbon comtent increases, and combustion zone width strengthens, and material layer temperature raises.Due to accumulation of heat effect, easily cause bottom prereduced sinter excess molten.The fractional melting of crossing of prereduced sinter not only makes the degree of metalization of prereduced sinter decline, and the ventilation property of the bed of material is deteriorated, and even burns out fire grate.
The especially brown iron ore of lump ore, directly enters blast-furnace smelting, can bring problems such as such as bursting, reflow conductor roll is poor.Brown iron ore crystal water content is generally greater than 5%, and crystal water is point heat of desorption at 400 DEG C ~ 500 DEG C temperature, and cause lump ore to burst more serious, metallurgical performance is poor.High crystal water lump ore aboundresources, price are lower, but do not carry out pre-treatment to it, directly can not enter blast furnace.
Paper " Japan's research and development New Pre reduction sintering technology " proposes: in sintered material, add rhombspar (CaCO
3mg CO
3) improve liquation occurrence temperature, suppress superfusion, but the method makes Mg content in sintered material too much, is unfavorable for blast furnace slag making.Paper also proposes to utilize accurate constitution, namely CaO composition, iron ore (ferric oxide) is superscribed on the surface of particle kernel, carbonaceous material in its outer wrap, burn till and after suppressing combustion of carbonaceous materials, melting occurs by the accurate particle of 3 layers of contexture, but this sintering bead complex structure, is difficult to application.
Paper " doing the experimental study of hearth layer for sintering with block iron ore " proposes one lump ore and replaces agglomerate to carry out pretreated method to lump ore as grate-layer material simultaneously, the method can improve productivity of sinter, reduce sintering energy consumption, remove the detrimental impurity such as lump ore crystal water and sulphur simultaneously, but lump ore inevitably bursts as during bed material, produce dust and be easily sucked into air draft pipe, add the dustiness in sintered discharge gas.
Summary of the invention
In view of the deficiency of above-mentioned technology, the present invention proposes a kind of distributing process producing prereduced sinter, is distributed into lump ore in proportion in prereduction sinter bed middle and lower part.In prereduction sintering process, utilize lump ore to remove crystal water draw heat, prevent prereduced sinter excess molten, also pre-treatment is carried out to lump ore simultaneously, improve lump ore metallurgical performance, improve lump ore and enter stove ratio.
Produce a distributing process for prereduced sinter, prereduction sintered material divides and two-layerly carries out cloth, and its mass percent going back that sintered material accounts for total stuff amount at the middle and upper levels is in advance 30% ~ 45%, and the mass percent that lower floor's prereduction sintered material accounts for total stuff amount is 55% ~ 70%; Evenly be mixed with lump ore in lower floor's prereduction sintered material, wherein lump ore accounts for the mass percent of prereduction sintering total stuff amount is 10% ~ 15%, finally carries out prereduction sintering.
Described prereduction sintered material, formed by iron ore concentrate, fuel, unslaked lime, Wingdale and wagnerite Homogeneous phase mixing, wherein fuel is made up of one or both in coke powder and pulverized anthracite, and its mass percent is 20% ~ 25%.
Described lump ore, its granularity is 10mm ~ 25mm, and crystal water content is less than 12%.
The present invention produces the distributing process of prereduced sinter, the lump ore higher containing crystal water absorbs heat at the prereduction sintering bottom bed of material, bottom prereduced sinter can be prevented because fuel in prereduction sintered material is with addition of more and cause excess molten, improve the ventilation property of the bed of material, improve the metallurgical performance of prereduced sinter; Lump ore, through high temperature removal crystal water, is partially reduced simultaneously, changes the metallurgical performance of the lump ore that fallen apart under reducing atmosphere, improves the furnace-mixing rate of lump ore.
Embodiment
Below in conjunction with the invention will be further described, embodiment is only the description to best mode for carrying out the invention, does not have any restriction to scope of the present invention.
Embodiment 1:
Iron ore concentrate, fuel, unslaked lime, Wingdale and wagnerite are prepared burden, be uniformly mixed into prereduction sintered material, wherein fuel is coke powder, and its mass percent is 22%, and the chemical composition of powdered iron ore used is as shown in table 1.
Table 1 iron ore concentrate chemical composition/%
Divided by prereduction sintered material and two-layerly carry out cloth, its mass percent going back that sintered material accounts for total stuff amount at the middle and upper levels is in advance 30%, and the mass percent that lower floor's prereduction sintered material accounts for total stuff amount is 70%; Evenly be mixed with in lower floor's prereduction sintered material containing the higher lump ore of crystal water, wherein lump ore accounts for the mass percent of prereduction sintering total stuff amount is 15%, finally carries out prereduction sintering, obtains prereduced sinter and enter stove.Lump ore chemical composition used is as shown in table 2, and its granularity is 10mm ~ 25mm.
Table 2 lump ore chemical composition/%
Gained prereduced sinter is tested, and compares with the prereduced sinter of normal cloth, as shown in table 3.Carry out metallurgical performance detection to the processed lump ore sifted out, and compare with the lump ore of not processed mistake, as shown in table 4, the metallurgical performance of known prereduced sinter and lump ore all makes moderate progress.
Table 3 prereduced sinter metallurgical performance table/%
Table 4 lump ore burst index and reduction degree/%
Embodiment 2:
Iron ore concentrate, fuel, unslaked lime, Wingdale and wagnerite are prepared burden, be uniformly mixed into prereduction sintered material, wherein fuel is coke powder and anthracitic mixing, and its mass percent is 25%, and the chemical composition of powdered iron ore used is as shown in table 5.
Table 5 iron ore concentrate chemical composition/%
Divided by prereduction sintered material and two-layerly carry out cloth, its mass percent going back that sintered material accounts for total stuff amount at the middle and upper levels is in advance 40%, and the mass percent that lower floor's prereduction sintered material accounts for total stuff amount is 60%; Evenly be mixed with in lower floor's prereduction sintered material containing the higher lump ore of crystal water, wherein lump ore accounts for the mass percent of prereduction sintering total stuff amount is 10%, finally carries out prereduction sintering, obtains prereduced sinter and enter stove.Lump ore chemical composition used is as shown in table 6, and its granularity is 10mm ~ 25mm.
Table 6 lump ore chemical composition/%
Gained prereduced sinter is tested, and compares with the prereduced sinter of normal cloth, as shown in table 7.Carry out metallurgical performance detection to the processed lump ore sifted out, and compare with the lump ore of not processed mistake, as shown in table 8, the metallurgical performance of known prereduced sinter and lump ore all makes moderate progress.
Table 7 prereduced sinter metallurgical performance table/%
Table 8 lump ore burst index and reduction degree/%
Claims (3)
1. produce the distributing process of prereduced sinter for one kind, it is characterized in that prereduction sintered material divides and two-layerly carry out cloth, its mass percent going back that sintered material accounts for total stuff amount at the middle and upper levels is in advance 30% ~ 45%, and the mass percent that lower floor's prereduction sintered material accounts for total stuff amount is 55% ~ 70%; Evenly be mixed with lump ore in lower floor's prereduction sintered material, wherein lump ore accounts for the mass percent of prereduction sintering total stuff amount is 10% ~ 15%, finally carries out prereduction sintering.
2. the distributing process of production prereduced sinter according to claim 1, it is characterized in that described prereduction sintered material, formed by iron ore concentrate, fuel, unslaked lime, Wingdale and wagnerite Homogeneous phase mixing, wherein fuel is made up of one or both in coke powder and pulverized anthracite, and its mass percent is 20% ~ 25%.
3. the distributing process of production prereduced sinter according to claim 1, is characterized in that described lump ore, and its granularity is 10mm ~ 25mm, and crystal water content is less than 12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310398865.3A CN104419824B (en) | 2013-09-05 | 2013-09-05 | A kind of distributing method producing prereduced sinter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310398865.3A CN104419824B (en) | 2013-09-05 | 2013-09-05 | A kind of distributing method producing prereduced sinter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104419824A true CN104419824A (en) | 2015-03-18 |
| CN104419824B CN104419824B (en) | 2016-11-16 |
Family
ID=52969943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310398865.3A Active CN104419824B (en) | 2013-09-05 | 2013-09-05 | A kind of distributing method producing prereduced sinter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104419824B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850197A (en) * | 2020-07-07 | 2020-10-30 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN114959255A (en) * | 2022-05-23 | 2022-08-30 | 武汉钢铁有限公司 | Lump ore pretreatment method based on preparation of sinter ore |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819792A (en) * | 2019-10-28 | 2020-02-21 | 鞍钢股份有限公司 | Method for producing pre-reduced sinter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126121A (en) * | 2007-10-16 | 2008-02-20 | 鞍钢股份有限公司 | Method for producing pre-reducing composite sinter |
| CN101928823A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Sintering method of iron ore powder with high content of crystal water |
| JP2012046828A (en) * | 2005-11-25 | 2012-03-08 | Jfe Steel Corp | Method for producing sintered ore |
-
2013
- 2013-09-05 CN CN201310398865.3A patent/CN104419824B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012046828A (en) * | 2005-11-25 | 2012-03-08 | Jfe Steel Corp | Method for producing sintered ore |
| CN101126121A (en) * | 2007-10-16 | 2008-02-20 | 鞍钢股份有限公司 | Method for producing pre-reducing composite sinter |
| CN101928823A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Sintering method of iron ore powder with high content of crystal water |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850197A (en) * | 2020-07-07 | 2020-10-30 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN111850197B (en) * | 2020-07-07 | 2022-02-15 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN114959255A (en) * | 2022-05-23 | 2022-08-30 | 武汉钢铁有限公司 | Lump ore pretreatment method based on preparation of sinter ore |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104419824B (en) | 2016-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103215443B (en) | High-ore-matching-ratio brown iron ore sintering technology | |
| CN102220440B (en) | Vanadium-titanium magnetite blast furnace smelting method capable of improving vanadium yield | |
| CN103361453B (en) | Blast-furnace smelting method for vanadium-titanium magnetite | |
| EP2450459B1 (en) | Blast-furnace operation method | |
| CN104232822B (en) | The method of high-phosphor oolitic hematite vanadium titano-magnetite blast furnace ironmaking | |
| CN105308194A (en) | Carbon material-containing granulated particles for manufacturing sintered ore, production method therefor, and production method for sintered ore | |
| CN104726696B (en) | Middle basicity deep-bed sintering production method | |
| KR20130053089A (en) | Part reduced iron for blast furnace and method thereof | |
| CN105219953B (en) | A kind of ferric manganese ore powder sintering matches somebody with somebody the method for ore deposit | |
| CN103509938B (en) | Method for preventing excessive fusion of prereduced sinter | |
| CN108998606B (en) | The blast furnace ferrous burden structure that a kind of pellet and Metallurgical Properties of Sinter are distributed rationally | |
| CN104561534A (en) | Magnesium containing fluxed oxide pellets and preparation method thereof | |
| CN105734278A (en) | Treatment method of laterite-nickel ores | |
| CN105803141A (en) | High-chrome vanadium-titanium magnetite blast furnace smelting charging material and blast furnace smelting method | |
| WO2022247356A1 (en) | Method for smelting nickel-containing metal, and application thereof | |
| CN106282453A (en) | A kind of method of sefstromite blast furnace process | |
| CN106521148A (en) | Method for preparing high carbon ferro-chrome by fusible chrome fine ore | |
| CN102021318A (en) | Magnesian self-fluxed pellet and preparation method thereof | |
| CN104651564B (en) | A kind of method of fast reduction in low temperature separation granulated iron | |
| CN103937971B (en) | The preparation method of iron ore hot pressing carbon-containing pelletizing and iron-smelting raw material | |
| CN104419824A (en) | Material distribution method for producing pre-reduced agglomerate | |
| CN104711418A (en) | Method for using metallurgical iron-bearing dust in iron-making | |
| CN105899690A (en) | Method for producing manganese containing ferroalloy | |
| CN103160683A (en) | Roasting pretreatment method for high crystal water content iron ore | |
| CN103757165A (en) | Comprehensive valuable component utilization method of blast-furnace smelting of high iron bauxite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |