CN102719587A - Rotary hearth furnace-smelting reduction furnace joint ironmaking process - Google Patents
Rotary hearth furnace-smelting reduction furnace joint ironmaking process Download PDFInfo
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- CN102719587A CN102719587A CN201210219131XA CN201210219131A CN102719587A CN 102719587 A CN102719587 A CN 102719587A CN 201210219131X A CN201210219131X A CN 201210219131XA CN 201210219131 A CN201210219131 A CN 201210219131A CN 102719587 A CN102719587 A CN 102719587A
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Abstract
The invention relates to a rotary hearth furnace-smelting reduction furnace joint ironmaking process. The rotary hearth furnace-smelting reduction furnace joint ironmaking process is characterized in that iron ore powder or dust and pulverized coal in steel works are proportioned according to proportion and pelletized, so that self-reducing pellets are formed, and the self-reducing pellets are dried and then added into a rotary hearth furnace; after the self-reducing pellets are reduced into sponge iron in the rotary hearth furnace, the sponge iron is directly added into an ironmaking furnace with the function of smelting reduction, and under the effect of the hot air preheated by an air heating furnace, molten iron which can be used in steel-making of the converter is produced by the sponge iron and briquetted non-coking coal. According to the process disclosed by the invention, coal, ore powder and even dust of steel works can be adopted to produce qualified molten iron, so the waste emission is favorably reduced, environmental pollution and the enterprise production cost are reduced, and the comprehensive utilization level of resources is increased at the same time, thereby playing an important role in enhancing the competitiveness of iron and steel enterprises and realizing the sustainable development of the steel industry in China.
Description
Technical field
The invention belongs to the Iron And Steel Industry technical field, relate to a kind of clean and effective ironmaking production technique of utilizing fine ore or dust to produce molten iron.
Background technology
Environmental requirement that steel industry is increasingly serious and Market Situation require iron and steel enterprise must accomplish energy-saving and emission-reduction, reduce cost.In iron-making production, because traditional blast furnace iron-making process need use coke, agglomerate, pellet etc., cause technology investment big, long flow path, energy consumption is high, makes blast furnace ironmaking operation discharge amount of pollution occupy the overwhelming majority of whole iron and steel flow process quantity discharged.Because China is main with lean ore mainly, the annual a large amount of iron ore of import that needs is used for blast furnace ironmaking, has aggravated the production cost of enterprise greatly.In addition, the coking coal resource that is used to produce coke is worsening shortages also, and expensive coke price also forces enterprise to look for the approach that reduces the coke consumption.
Given this, a series of non-blast furnace ironmaking technologies are arisen at the historic moment.Yet for various reasons, at present, that realizes commercially producing only has technologies such as COREX, FINEX, rotary hearth furnace.COREX, FINEX explained hereafter efficient height, product is a molten iron, however production practice show that COREX need use lump ore, and still need use coke, and FINEX uses fluidized-bed process, occurs phenomenons such as bonding easily.Though rotary hearth furnace is reductive agent with the coal, except can adopting fine ore of high grade, also can use the low-grade fine ore of China, or even Iron And Steel Plant's dust etc. is as the raw material production sponge iron, production efficiency is lower.
Summary of the invention
Problem to be solved by this invention is to deficiency of the prior art; A kind of rotary hearth furnace melting reduction stove associating iron-smelting process is proposed; Use coal and fine ore even Iron And Steel Plant's dust just can produce qualified molten iron, not only help reducing waste discharge, reduce environmental pollution and enterprise production cost; Simultaneously, help improving the comprehensive utilization of resources level.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of rotary hearth furnace melting reduction stove associating iron-smelting process is characterized in that: with fine iron ore or Iron And Steel Plant's dust and coal dust in proportion proportioning form the autoreduction pelletizing after making ball, the autoreduction pelletizing is after oven dry, in the adding rotary hearth furnace; The autoreduction pelletizing is reduced into sponge iron in rotary hearth furnace after; Directly added with hot form in the puddler of melting and reducing effect; With through the mill coal of briquetting,, produce the molten iron that can supply converter steelmaking to use under the effect of the warm air of hotblast stove preheating.
By technique scheme, described puddler shaft middle part is provided with the air port that a circle can spray into the air after the preheating.
By technique scheme, in the described mill coal, the lump coal of >=10mm directly gets into puddler, and the mill coal of＜10mm gets into puddler behind coal briquette system briquetting.
By technique scheme, the sponge iron degree of metalization that described rotary hearth furnace is produced is greater than 65%.
By technique scheme, air gets in the puddler after hotblast stove is preheated to more than 1200 ℃.
By technique scheme, the flue gas that said rotary hearth furnace produces is sent to and makes the ball workshop and be used to dry the autoreduction pelletizing after residual neat recovering system reclaims heat.
By technique scheme, puddler by product coal gas is after purifying, and a part supplies rotary hearth furnace to use, and another part supplies puddler to recycle.
By technique scheme, the described puddler mode of tapping a blast furnace is consistent with the blast furnace casting mode, and all the iron notch through the bottom taps a blast furnace.
Technology of the present invention has been abandoned the raw material that uses coke, agglomerate, pellet etc. expensive in traditional blast furnace iron-making process; Advantage in conjunction with fused reduction iron-smelting technology in the non-blast furnace technology and rotary hearth furnace coal-based direct reduction technology; Directly use fine ore (or Iron And Steel Plant's dust) and mill coal; Can significantly reduce environmental pollution, reduce the enterprise production cost.Sponge iron directly adds in the puddler with hot form, to make full use of the latent heat of sponge iron.In addition, existing blast furnace technology is continued to use in the selection of puddler basically, and ripe, safe and reliable, simple operation and other advantages possess skills.
Description of drawings
Accompanying drawing is the process flow sheet of the embodiment of the invention.
Embodiment
For understanding the present invention better, below in conjunction with accompanying drawing and embodiment the present invention is further described, but is not construed as limiting the invention.
Rotary hearth furnace melting reduction stove associating iron-smelting process of the present invention; It is characterized in that: with fine iron ore or Iron And Steel Plant's dust (like blast furnace discharge yard ash, gas ash, converter stove dirt, roll scale etc.) and coal dust in proportion proportioning form the autoreduction pelletizing after making ball; The autoreduction pelletizing adds in the rotary hearth furnace after oven dry; The autoreduction pelletizing is reduced into sponge iron in rotary hearth furnace after, directly add in the puddler, with through the mill coal of briquetting,, produce the molten iron that can supply converter steelmaking to use under the effect of the warm air of hotblast stove preheating with hot form.Puddler plays the melting and reducing effect in said process, form rotary hearth furnace melting reduction stove associating iron-smelting process with rotary hearth furnace.
Described puddler body of heater and blast-furnace body basically identical, difference only are to be provided with at puddler shaft middle part the air port of the air after a circle can spray into preheating.
In the described mill coal, the lump coal of >=10mm directly gets into puddler, and the mill coal of＜10mm gets into puddler behind coal briquette system briquetting.
The sponge iron degree of metalization that described rotary hearth furnace is produced is greater than 65%.
Air gets in the puddler after hotblast stove is preheated to more than 1200 ℃.
The flue gas that said rotary hearth furnace produces is sent to and makes the ball workshop and be used to dry the autoreduction pelletizing after residual neat recovering system reclaims heat.
Puddler by product coal gas is after purifying, and a part supplies rotary hearth furnace to use, and another part supplies puddler to recycle.
The described puddler mode of tapping a blast furnace is consistent with the blast furnace casting mode, and all the iron notch through the bottom taps a blast furnace.
Embodiment 1
1) the smart powder of iron, coal dust, sticker etc. being made ball in proportion behind the mixing becomes the autoreduction pelletizing and dries with the rotary hearth furnace fume afterheat;
2) the autoreduction pelletizing after will drying adds in the rotary hearth furnace and reduces, and reduction temperature is 1380 ℃, and the recovery time is 12 minutes;
3) degree of metalization that obtains after will reducing is that 75% hot sponge iron adds in the puddler;
4) mill coal is after screening, and the lump coal of >=10mm directly gets into puddler, and the mill coal of＜10mm gets into puddler behind coal briquette system briquetting;
5) air feeds in the puddler after hotblast stove is preheated to about 1250 ℃;
6) in puddler, sponge iron, mill coal obtain meeting the molten iron of steel-making requirements under the effect of warm air.
Embodiment 2
1) Iron And Steel Plant's dust, coal dust, sticker etc. are made ball formation autoreduction pelletizing behind the mixing in proportion, and dry with the rotary hearth furnace fume afterheat;
2) the autoreduction pelletizing after will drying adds in the rotary hearth furnace and reduces, and reduction temperature is 1400 ℃, and the recovery time is 15 minutes;
3) degree of metalization that obtains after will reducing is that 66% hot sponge iron adds in the puddler;
4) mill coal is after screening, and the lump coal of >=10mm directly gets into puddler, and the mill coal of＜10mm gets into puddler behind coal briquette system briquetting;
5) air feeds in the puddler after hotblast stove is preheated to about 1280 ℃;
6) in puddler, sponge iron, mill coal obtain meeting the molten iron of steel-making requirements under the effect of warm air.
Above disclosedly be merely preferred embodiment of the present invention, change, still belong to protection scope of the present invention according to the equivalence that the present invention did.
Claims (8)
1. rotary hearth furnace melting reduction stove associating iron-smelting process is characterized in that: with fine iron ore or Iron And Steel Plant's dust and coal dust in proportion proportioning form the autoreduction pelletizing after making ball, the autoreduction pelletizing is after oven dry, in the adding rotary hearth furnace; The autoreduction pelletizing is reduced into sponge iron in rotary hearth furnace after; Directly added with hot form in the puddler of melting and reducing effect; With through the mill coal of briquetting,, produce the molten iron that can supply converter steelmaking to use under the effect of the warm air of hotblast stove preheating.
2. iron-smelting process according to claim 1 is characterized in that: described puddler shaft middle part is provided with the air port that a circle can spray into the air after the preheating.
3. iron-smelting process according to claim 1 and 2 is characterized in that: in the described mill coal, the lump coal of >=10mm directly gets into puddler, and the mill coal of＜10mm gets into puddler behind coal briquette system briquetting.
4. iron-smelting process according to claim 3 is characterized in that: the sponge iron degree of metalization that described rotary hearth furnace is produced is greater than 65%.
5. according to claim 1 or 2 or 4 described iron-smelting process, it is characterized in that: air gets in the puddler after hotblast stove is preheated to more than 1200 ℃.
6. iron-smelting process according to claim 5 is characterized in that: the flue gas that said rotary hearth furnace produces is sent to and makes the ball workshop and be used to dry the autoreduction pelletizing after residual neat recovering system reclaims heat.
7. according to claim 1 or 2 or 4 or 6 described iron-smelting process, it is characterized in that: puddler by product coal gas is after purifying, and a part supplies rotary hearth furnace to use, and another part supplies puddler to recycle.
8. iron-smelting process according to claim 7 is characterized in that: the described puddler mode of tapping a blast furnace is consistent with the blast furnace casting mode, all is that the iron notch through the bottom taps a blast furnace.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994680A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Controllable atmosphere rotary hearth furnace process for producing direct reduction iron |
| CN104694758A (en) * | 2015-03-13 | 2015-06-10 | 宝钢发展有限公司 | Technique for comprehensively utilizing iron-containing dust mud |
| CN110055360A (en) * | 2019-05-10 | 2019-07-26 | 重庆赛迪热工环保工程技术有限公司 | Blast-melted method is added in a kind of DRI |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1087124A (en) * | 1993-11-16 | 1994-05-25 | 冶金工业部钢铁研究总院 | Reduction iron-smelting process with carbon containing pellets-iron bath fusion |
| JP2006104501A (en) * | 2004-10-01 | 2006-04-20 | Nippon Steel Corp | Method for reducing and melting iron oxide-containing iron raw material |
| US20070295165A1 (en) * | 2004-10-29 | 2007-12-27 | Kabushiki Kaisha Kobe Seiko Sho ( Kobe Steel Ltd.) | Process for Producing Molten Iron and Apparatus Therefor |
| CN101121950A (en) * | 2007-09-21 | 2008-02-13 | 郭瑛 | Tube furnace-shaft furnace twin coal-base fusing reduction iron-smelting method |
| CN101492752A (en) * | 2009-03-05 | 2009-07-29 | 姚永林 | Reduction-fusion iron manufacturing process for coal-bearing pellets |
-
2012
- 2012-06-29 CN CN201210219131XA patent/CN102719587A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1087124A (en) * | 1993-11-16 | 1994-05-25 | 冶金工业部钢铁研究总院 | Reduction iron-smelting process with carbon containing pellets-iron bath fusion |
| JP2006104501A (en) * | 2004-10-01 | 2006-04-20 | Nippon Steel Corp | Method for reducing and melting iron oxide-containing iron raw material |
| US20070295165A1 (en) * | 2004-10-29 | 2007-12-27 | Kabushiki Kaisha Kobe Seiko Sho ( Kobe Steel Ltd.) | Process for Producing Molten Iron and Apparatus Therefor |
| CN101121950A (en) * | 2007-09-21 | 2008-02-13 | 郭瑛 | Tube furnace-shaft furnace twin coal-base fusing reduction iron-smelting method |
| CN101492752A (en) * | 2009-03-05 | 2009-07-29 | 姚永林 | Reduction-fusion iron manufacturing process for coal-bearing pellets |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994680A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Controllable atmosphere rotary hearth furnace process for producing direct reduction iron |
| CN104694758A (en) * | 2015-03-13 | 2015-06-10 | 宝钢发展有限公司 | Technique for comprehensively utilizing iron-containing dust mud |
| CN110055360A (en) * | 2019-05-10 | 2019-07-26 | 重庆赛迪热工环保工程技术有限公司 | Blast-melted method is added in a kind of DRI |
| CN110055360B (en) * | 2019-05-10 | 2020-12-01 | 重庆赛迪热工环保工程技术有限公司 | Method for adding DRI into blast furnace molten iron |
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Application publication date: 20121010 |