CN1537959A - Cold aggregated pellet ore for ironmaking in blast furnace and its preparation method - Google Patents
Cold aggregated pellet ore for ironmaking in blast furnace and its preparation method Download PDFInfo
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- CN1537959A CN1537959A CNA2003101048936A CN200310104893A CN1537959A CN 1537959 A CN1537959 A CN 1537959A CN A2003101048936 A CNA2003101048936 A CN A2003101048936A CN 200310104893 A CN200310104893 A CN 200310104893A CN 1537959 A CN1537959 A CN 1537959A
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- blast furnace
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Abstract
A cold aggregated pellet ore for iron-smelting in blast furnace is prepared from the Fe contained material, Ca contained material and bentonite as adhesive through proportional mixing, die pressing and drying. It contains Fe (43-60 wt.%), Ca (8-20) and Si (6-12). Its advantages are low cost and less pollution.
Description
Technical field:
The present invention relates to the preceding furnace charge of ferrous metal smelting and prepare, a kind of unfired pellets and preparation method thereof is provided especially, this unfired pellets can be used as the refrigerant of blast furnace ironmaking, converter steelmaking and directly reduces furnace charge.
Background technology:
Blast furnace ironmaking process is gone into stove with iron ore concentrate and coke and other auxiliary material exactly, by a series of redox reactions, and the process that iron is cemented out.China's blast furnace ironmaking output is big, for a long time historical, and by long-term practice, people sum up " the six word policies " of using furnace charge, that is: high, ripe, clean, little, even, steady.So-called " height " promptly is to improve the stove ore grade; " ripe " promptly is to improve the agglomerate ratio of going into furnace charge; " only " is that gangue and foreign matter content are few in the raw material; " little " refers to that the iron ore granularity is little, but is not less than 5mm; " spare " and refer to epigranular; " surely " refers to chemical composition stability.
At present, domestic and international most of blast furnace or the direct used iron ore material of reduction furnace, the agglomerate that sintering forms behind the thin iron concentrate pelletization of all serving as reasons, or the unfired pellets that forms with the binding agent bonding.
Agglomerate is as the term suggests be exactly by " burnings " and agglomeration generally will be heated to high temperature with fuel, and it is fixed that the purpose of pyroprocessing not only can make iron essence powder like this, and can make the metallurgical performance of lump ore that some variations also take place, and becomes " ripe " and expect.But there is following shortcoming in agglomerate:
1, high-temperature calcination process produces ferrous iron, and content is about 12%, and is bigger to the operation of blast furnace influence.
2, granularity is inhomogeneous, rate of return mine height, and production efficiency is low.
This is that 10-30mm supplies with blast furnace and does raw material because agglomerate needs in process of production through twice screening, and agglomerate need sieve before going into blast furnace for the third time, will remove less than the agglomerate of 5mm, to improve blast furnace permeability.Be commonly called as less than the screen underflow of 5mm and return mine, need double sintering, this process circulation is carried out repeatedly, promptly wastes energy, and influences production efficiency again.
3, because of agglomerate pushes without external force, ultimate compression strength is relatively poor, and it is frangible to go into stove, influences blast furnace permeability.
4, basicity instability.
Unfired pellets then be with contain powdered iron ore, additive is allocated a certain amount of binding agent into and is mixed, through extrusion forming, obtain through cryodrying or normal temperature maintenance again.Owing to also need broken behind the smart powder sintering of iron, and broken back granularity can not be even as unfired pellets, thereby for unfired pellets, only otherwise bring its grade of too much impurity effect in binding agent, others are no less than agglomerate, and because of its manufacturing process flow easy, easy to operate, less investment, energy consumption is low, and cheap for manufacturing cost.
The main gordian technique of unfired pellets is choosing of binding agent and consolidation technique, and more common at present binding agent mainly contains cement, water glass, pitch, and all there is shortcoming separately in these binding agents:
Cement: dosage is big, and is about 10%, influences the pelletizing grade, and curing time is long, and the pelletizing high-temperature behavior is poor.
Water glass: dosage is big, and is about 8%, influences the pelletizing grade, increased " the alkali evil " of blast furnace.
Pitch: unfavorable processing, easy blocking pipe during smelting.
In addition, two problems of these binding agent ubiquities: the one, the pellet strength of producing is generally relatively poor.The 2nd, the binding agent cost is higher.
On the other hand, producing in the production process of ironmaking, steel-making has a large amount of industrial wastes such as iron dust containing, and environment is caused very big pollution how at low cost, expeditiously, recycle good these waste materials, is present problem demanding prompt solution.The treatment process of ironmaking, steel-making dust is a lot of in the prior art, CN214740A " handles the method and apparatus of ironmaking and steel-making dust " as the Chinese patent bulletin, be by ironmaking or steel-making dust are mixed with active carbonaceous material, in the external heating type rotary kiln, reduce then and handle to separate and to reclaim the Ferrous ﹠ Non Ferrous Metal (as zinc) that is contained in this dust; And for example, Chinese patent bulletin CN1070690A " method of dedusting steel-smelting converter mud balling-up ", after being tankage-lime powder fine grinding with dedusting steel-smelting converter mud and lime shaft kiln, add stirrer by proportioning and add the water mixing, after digestion, cause to meet with disk and make steel the sludge ball of service requirements, as the synthetic slag of steel-making; And for example, Chinese patent application (95113202) " a kind of produce method of iron powder and products thereof " with steel-making converter flue dust or mud, this invention to steel-making converter flue dust or mud size mixing, magnetic separation separates, again magnetic product is carried out technologies such as ball milling, selected, reduced anneal and reclaims metallic iron in steel-making converter flue dust or the mud.
Summary of the invention:
The purpose of this invention is to provide a kind of blast furnace ironmaking unfired pellets and preparation method thereof, this blast furnace ironmaking unfired pellets with the industrial waste preparation, ironmaking main technique requirement can be satisfied, energy consumption and pollution and less investment can be reduced again, cost is low as far as possible.
The invention provides a kind of blast furnace ironmaking unfired pellets, it is characterized in that described pellet by ferrous material, calcic material as main raw material, with wilkinite as binding agent, through mix, compacting, the dry acquisition; Its basicity is between 1.1-2.1, and ultimate compression strength is at 110-200kg/cm
2Between; Mainly contain weight percent in the chemical ingredients:
Fe 43～60
Ca 8～20
Si 6～12。
Blast furnace ironmaking of the present invention is with in the unfired pellets, and iron level is preferably 50～58 weight percents, and the pellet granularity is 30-50mm.
The present invention also provides the above-mentioned blast furnace ironmaking preparation method with unfired pellets, it is characterized in that ferrous material, calcic material and binding agent proportioning is on demand mixed, at 150-250kg/cm
2Forming under the pressure is at 100～500 ℃ of dry down the finished product that obtain.
Blast furnace ironmaking of the present invention is with among the preparation method of unfired pellets, and ferrous material can be selected from converter dust-removing mud, shaft furnace, sintering dust separation ash, steel rolling iron scale, ironmaking screen underflow, steel slag magnetically dressing powder, one or more of magnetic separation scum powder.
Blast furnace ironmaking of the present invention is with among the preparation method of unfired pellets, and the calcic material can be the leakage kiln ash of Lime Factory.
Blast furnace ironmaking of the present invention requires the water content of raw material to be preferably lower than 10% with among the preparation method of unfired pellets.
As binding agent, by the allotment to industrial waste, the content of calcium and silicon makes unfired pellets reach certain basicity and intensity in the strict control unfired pellets, thereby satisfies the main technique requirement that ironmaking is produced with wilkinite in the present invention.The blast furnace ironmaking unfired pellets that adopts the inventive method to make, utilization coefficient can reach 1.2～1.8T/M
2H, rotary drum (Is05) can reach 63～73%, and fuel consumption is 40～55 kilograms of standard coals/ton ore deposit, FeO5～11%, reduction degree 70～88%.TFe49～62%, low temperature efflorescence 5～20%, every technical indicator all is better than the ordinary sinter ore deposit with basicity.The unfired pellets that utilizes method of the present invention to make can satisfy the requirement to raw material such as blast furnace fully.Relatively have the following advantages with agglomerate:
1, cost is low, and comparative effectiveness is arranged; The agglomerate raw material is a fine iron breeze, and raw material of the present invention is a trade waste, and both have huge comparative effectiveness;
2, unfired pellets non-oxidation of the present invention is ferrous;
3, epigranular;
4, the rate of return mine is low;
5, thermal response is fast, reduces burnt material ratio;
6, ultimate compression strength height;
7, iron-holder, basicity are suitable.
Embodiment:
Embodiment 1:
Raw material: iron sheet 4000kg, heavy mud 4000kg leaks kiln ash 1000kg, binding agent 1000kg.With raw material mixing, stirring in proportion, be pressed into the pincushion agglomerate that shape is more reasonable, intensity is bigger with the high pressure roller ball press, with the kiln oven dry, obtain finished product.Finished product granularity: 30-50mm, leading indicator: Fe 53%, Ca18%, Si 8.6%; Basicity, 2.1%.
Embodiment 2:
Raw material: shaft furnace dedusting ash 2200kg, steel slag magnetically dressing powder 3000kg, heavy mud 4000kg, binding agent 1000kg.。With raw material mixing, stirring in proportion, be pressed into the pincushion agglomerate that shape is more reasonable, intensity is bigger with the high pressure roller ball press, with the kiln oven dry, obtain finished product.
Finished product leading indicator: Fe 54%, Ca 17%, and Si 10%.
Embodiment 3:
Raw material: iron sheet 1800kg, heavy mud 5400kg, steel slag magnetically dressing powder 900kg, binding agent 900kg.With raw material mixing, stirring in proportion, be pressed into the pincushion agglomerate that shape is more reasonable, intensity is bigger with the high pressure roller ball press, with the kiln oven dry, obtain finished product.
Finished product leading indicator: Fe 55%, Ca 13%, and Si 8.1%.
At 13M
3Blast furnace in be that raw material is smelted with above-mentioned unfired pellets, the direct motion of State of Blast Furnace ore deposit, blast curve are stable, and the recovery rate of iron the grade with unfired pellets is suitable basically.
Claims (7)
1, a kind of blast furnace ironmaking unfired pellets, it is characterized in that described pellet by ferrous material, calcic material as main raw material, with wilkinite as binding agent, through mix, compacting, the dry acquisition; Its basicity is between 1.1-2.1, and ultimate compression strength is at 110-200kg/cm
2Between; Mainly contain weight percent in the chemical ingredients:
Fe 43～60
Ca 8～20
Si 6～12。
2, want 1 described blast furnace ironmaking unfired pellets according to right, it is characterized in that iron level is 50～58.
3, want 1 or 2 described blast furnace ironmaking unfired pellets according to right, it is characterized in that pellet granularity 30-50mm.
4, the described blast furnace ironmaking of a kind of claim 1 is with the preparation method of unfired pellets, it is characterized in that ferrous material, calcic material and binding agent proportioning is on demand mixed, at 150-250kg/cm
2Forming under the pressure is at 100～500 ℃ of dry down the finished product that obtain.
5, according to the preparation method of the described blast furnace ironmaking of claim 4, it is characterized in that described ferrous material is selected from converter dust-removing mud, shaft furnace, sintering dust separation ash with unfired pellets, the steel rolling iron scale, the ironmaking screen underflow, steel slag magnetically dressing powder, one or more of magnetic separation scum powder, fine ore.
6, use the preparation method of unfired pellets according to claim 4 or 5 described blast furnace ironmakings, it is characterized in that described calcic material is that kiln ash or light-burning magnesium powder are leaked in Lime Factory.
7, use the preparation method of unfired pellets according to claim 4 or 5 described blast furnace ironmakings, it is characterized in that described raw material water content is lower than 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101048936A CN1537959A (en) | 2003-10-23 | 2003-10-23 | Cold aggregated pellet ore for ironmaking in blast furnace and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101048936A CN1537959A (en) | 2003-10-23 | 2003-10-23 | Cold aggregated pellet ore for ironmaking in blast furnace and its preparation method |
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| CN1537959A true CN1537959A (en) | 2004-10-20 |
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| CNA2003101048936A Pending CN1537959A (en) | 2003-10-23 | 2003-10-23 | Cold aggregated pellet ore for ironmaking in blast furnace and its preparation method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747217A (en) * | 2012-06-14 | 2012-10-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore |
| CN102816925A (en) * | 2012-08-24 | 2012-12-12 | 首钢总公司 | Method and system for recycling iron-containing sludge |
| CN101466853B (en) * | 2006-05-24 | 2013-01-09 | 沙特基础工业公司 | Process for recycling of steel industry iron bearing by-products, pellet obtained in that process and use thereof |
| CN103103310A (en) * | 2011-11-11 | 2013-05-15 | 攀钢集团西昌钢钒有限公司 | Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method |
| CN103468939A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Cold-pressed pellet binder and preparation method thereof |
| CN104046772A (en) * | 2013-03-15 | 2014-09-17 | 上海梅山钢铁股份有限公司 | Method for making cooled agglomerated pellets by use of converter gas dry-method electrostatic precipitator |
| CN104073632A (en) * | 2013-03-27 | 2014-10-01 | 鞍钢股份有限公司 | Blast furnace oxidized pellet using steel rolling oil sludge as binder and preparation method thereof |
| CN105506218A (en) * | 2016-01-18 | 2016-04-20 | 四川省江油市新华泰实业有限责任公司 | Method for refining high-quality crude steel from scrap steel |
| CN105648144A (en) * | 2016-01-18 | 2016-06-08 | 四川省江油市新华泰实业有限责任公司 | Method for refining large-sized crude steel plate with scrap steel serving as raw material |
| CN105950863A (en) * | 2016-05-11 | 2016-09-21 | 江苏省冶金设计院有限公司 | Ferronickel powder forming method |
| CN111235386A (en) * | 2020-01-19 | 2020-06-05 | 中冶宝钢技术服务有限公司 | Method for forming dedusting ash |
| CN111893297A (en) * | 2020-08-06 | 2020-11-06 | 河北蓝海智投环保科技有限公司 | Preparation method of cold-pressed block of converter fly ash |
| CN112604229A (en) * | 2020-12-09 | 2021-04-06 | 山西四喜春工贸有限公司 | Preparation method for dumbbell barbell disc made of blast furnace dust iron oxide |
| CN112981095A (en) * | 2021-02-08 | 2021-06-18 | 山西太钢不锈钢股份有限公司 | Iron scale ball pressing process |
| CN114410963A (en) * | 2022-01-26 | 2022-04-29 | 宝钢德盛不锈钢有限公司 | Binder for acid-washed sludge and gravity ash cooled agglomerated pellets and preparation method thereof |
| CN114763583A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Preparation method of iron ore powder cold briquetting and application of iron ore powder cold briquetting |
-
2003
- 2003-10-23 CN CNA2003101048936A patent/CN1537959A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101466853B (en) * | 2006-05-24 | 2013-01-09 | 沙特基础工业公司 | Process for recycling of steel industry iron bearing by-products, pellet obtained in that process and use thereof |
| CN103103310B (en) * | 2011-11-11 | 2014-12-17 | 攀钢集团西昌钢钒有限公司 | Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method |
| CN103103310A (en) * | 2011-11-11 | 2013-05-15 | 攀钢集团西昌钢钒有限公司 | Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method |
| CN102747217B (en) * | 2012-06-14 | 2016-06-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Powdery difficulty selects iron oxide ore cold-pressing balls agglomeration, shaft furnace magnetizing roasting sorting process |
| CN102747217A (en) * | 2012-06-14 | 2012-10-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore |
| CN102816925A (en) * | 2012-08-24 | 2012-12-12 | 首钢总公司 | Method and system for recycling iron-containing sludge |
| CN104046772A (en) * | 2013-03-15 | 2014-09-17 | 上海梅山钢铁股份有限公司 | Method for making cooled agglomerated pellets by use of converter gas dry-method electrostatic precipitator |
| CN104073632A (en) * | 2013-03-27 | 2014-10-01 | 鞍钢股份有限公司 | Blast furnace oxidized pellet using steel rolling oil sludge as binder and preparation method thereof |
| CN104073632B (en) * | 2013-03-27 | 2017-08-11 | 鞍钢股份有限公司 | Blast furnace oxidized pellet using steel rolling oil sludge as binder and preparation method thereof |
| CN103468939B (en) * | 2013-09-06 | 2016-02-24 | 鞍钢股份有限公司 | Cold-pressed pellet and preparation method thereof |
| CN103468939A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Cold-pressed pellet binder and preparation method thereof |
| CN105506218A (en) * | 2016-01-18 | 2016-04-20 | 四川省江油市新华泰实业有限责任公司 | Method for refining high-quality crude steel from scrap steel |
| CN105648144A (en) * | 2016-01-18 | 2016-06-08 | 四川省江油市新华泰实业有限责任公司 | Method for refining large-sized crude steel plate with scrap steel serving as raw material |
| CN105950863A (en) * | 2016-05-11 | 2016-09-21 | 江苏省冶金设计院有限公司 | Ferronickel powder forming method |
| CN105950863B (en) * | 2016-05-11 | 2018-07-17 | 江苏省冶金设计院有限公司 | Ferronickel powder forming method |
| CN111235386A (en) * | 2020-01-19 | 2020-06-05 | 中冶宝钢技术服务有限公司 | Method for forming dedusting ash |
| CN111893297A (en) * | 2020-08-06 | 2020-11-06 | 河北蓝海智投环保科技有限公司 | Preparation method of cold-pressed block of converter fly ash |
| CN111893297B (en) * | 2020-08-06 | 2021-05-11 | 河北蓝海智投环保科技有限公司 | Preparation method of cold-pressed block of converter fly ash |
| CN112604229A (en) * | 2020-12-09 | 2021-04-06 | 山西四喜春工贸有限公司 | Preparation method for dumbbell barbell disc made of blast furnace dust iron oxide |
| CN114763583A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Preparation method of iron ore powder cold briquetting and application of iron ore powder cold briquetting |
| CN114763583B (en) * | 2021-01-15 | 2023-09-12 | 宝山钢铁股份有限公司 | Preparation method of iron ore powder cold-pressed pellet and application of iron ore powder cold-pressed pellet |
| CN112981095A (en) * | 2021-02-08 | 2021-06-18 | 山西太钢不锈钢股份有限公司 | Iron scale ball pressing process |
| CN114410963A (en) * | 2022-01-26 | 2022-04-29 | 宝钢德盛不锈钢有限公司 | Binder for acid-washed sludge and gravity ash cooled agglomerated pellets and preparation method thereof |
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