CN104711418A - Method for using metallurgical iron-bearing dust in iron-making - Google Patents
Method for using metallurgical iron-bearing dust in iron-making Download PDFInfo
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Abstract
The invention discloses a method for recycling metallurgical iron-bearing dust. The method comprises the following steps: mixing 96-98% of iron-bearing dust with 2-4% of bentonite, preparing the mixture of the iron-bearing dust and the bentonite into cold bound pellets or cold bound blocks through cold ball pressing technology, replacing finished product sinter to serve as a sintering bedding material, sintering green pellets via afterheat in a sintering process, and conveying the sintered cold bound pellets or cold bound blocks in a blast furnace. Compared with the existing methods, the method disclosed by the invention is used for pelletizing the iron-bearing dust and replacing the iron-bearing dust with the sintering bedding material, so that the iron-bearing dust can be not only used for reducing the iron making cost, but also solving the environmental problem caused by dust, more importantly, since the cold bound pellets replace the finished product sinter to serve as the sintering bedding material, the strength in the blast furnace is good and the pulverization rate is low, and the sintered cold bound pellets are conveyed into the furnace to replace a part of raw ores to improve the clinker modulus of the blast furnace and perfect the gas permeability of the blast furnace, so as to reduce the coke ratio and increase the yield.
Description
Technical field
The present invention relates to field of steel metallurgy, particularly relate to a kind of method that ironmaking utilizes metallurgical ferrous dust.
Background technology
The process of blast furnace ferrous fines is for a long time the problem extremely paid close attention in metallurgy industry always.Effectively utilize the iron dust containings (TFe is probably 20% ~ 40%) such as stokehold iron flask dedusting ash, gravitational dust collection are grey, bag-type dust is grey, reasonably utilize metallurgical ferrous dust not only can reduce pig iron cost, the harm of these dust to environment can also be solved.The current common practice for these ferrous materials makes pelletizing directly allocate blast furnace into or these metallurgical allocated into agglomerate containing the direct dirt of iron powder and enter blast furnace more both at home and abroad, reaches the object of resource reutilization, reduce production cost, reduce the pollution to environment.But because green ball strength is poor, directly enter in blast furnace burden to bring into the amount being less than 5mm and increase, blast furnace feeding amount of powder increases, thus affects blast furnace burden ventilation property, affects smooth operation of furnace afterwards.
Summary of the invention
Object of the present invention is just the reuse method providing a kind of metallurgical ferrous dust, reduce pig iron cost, also solve the environmental problem that dust brings, cooled agglomerated pellet substitutes finished product agglomerate as sintering grate-layer material, by the high temperature action of sintering process, the intensity of ball can reach about 1500 ~ 2000N, enter that blast furnace intensity is good, Pulverization ratio is low, after sintering, cooled agglomerated pellet Substitute For Partial rawore enters stove, blast furnace grog rate can be improved, improve blast furnace permeability, reach the object reducing coke ratio and increase yield.
To achieve these goals, the technical solution used in the present invention is: a kind of reuse method of metallurgical ferrous dust, and method steps is as follows,
A. get the raw materials ready, the iron dust containing of 96% ~ 98% is adopted to mix with 2% ~ 4% wilkinite, bentonite ore ratio determines the intensity of cooled agglomerated pellet, because cooled agglomerated pellet needs as hearth layer for sintering, its ultimate compression strength > 200N of general requirement, if bentonite ore ratio is too high, cooled agglomerated pellet grade can be affected and cost increases too many, uneconomical;
B. pelletizing, by being cold-pressed into playing skill art, it is 6 ~ 10mm cooled agglomerated pellet or cold-consolidated ball block that above-mentioned iron dust containing and bentonitic mixture are made granularity, because the ball made is used as hearth layer for sintering, between sinter machine grid, gap is generally 6mm, ensure the ventilation property of sintering process; Being not more than 10mm is that top sinter mixture does not leak material in order under the prerequisite ensureing sintering ventilation property, if excessive clearance between grate-layer material, may cause the part directly lower leakage being less than 6mm in the sinter mixture of top;
C. sinter, substitute finished product agglomerate as sintering grate-layer material, the waste heat of sintering process is utilized to sinter green-ball, the ultimate compression strength of cooled agglomerated pellet ball under the high temperature action of sintering process reaches 1500 ~ 2000N, cooled agglomerated pellet can not be pulverized because of the extruding of top furnace charge, blast furnace burden ventilation property can not be worsened, affect smooth operation of furnace;
D. enter blast furnace, adjustment blast furnace burden, reduces lump ore consumption, increases agglomerate consumption, and allocates the cooled agglomerated pellet after above-mentioned sintering or cold-consolidated ball block into blast furnace.
As preferably, in step a, described iron dust containing is that stokehold iron flask dedusting ash, gravitational dust collection ash or bag-type dust are grey.
As preferably, in step a, the TFe content of described iron dust containing is that 20 ~ 30%, TFe amount is less than 20%, enters stove, can increase slag amount in smelting, making blast furnace fuel than increasing, can not play the object reducing pig iron cost by the method; And TFe amount is greater than 30%, for cost consideration, directly allocating agglomerate into can be a kind of better selection, to reducing costs advantageously.
As preferably, in step c, on the grid section cooled agglomerated pellet made being laid on sinter machine, laying depth is 20 ~ 30mm, on cooled agglomerated pellet, laying depth 530 ~ 590mm sinter mixture sinters, selecting above-mentioned thickness, is because cooled agglomerated pellet intensity is not high, if grate-layer material is too thin, sinter mixture is too thick, the cooled agglomerated pellet of bottom can be made crushed, affect the ventilation property of sintering process, worsen agglomerate index; If grate-layer material is too thick, sinter mixture is too thin, and productivity of sintering machine can reduce, and affects sintering output, experimental results demonstrate, using above-mentioned Pu Liao thickness, both can ensure sintering process ventilation property, can not reduce productivity of sintering machine again, is optimal control parameter.
Compared with prior art, the invention has the advantages that: the present invention is by these iron dust containing pelletizings, and substitute hearth layer for sintering, these iron dust containings can not only be utilized, reduce pig iron cost, also solve the environmental problem that dust brings, what is more important substitutes finished product agglomerate as sintering grate-layer material due to cooled agglomerated pellet, by the high temperature action of sintering process, the intensity of ball can reach about 1500 ~ 2000N, enter blast furnace intensity good, Pulverization ratio is low, after sintering, cooled agglomerated pellet Substitute For Partial rawore enters stove, blast furnace grog rate can be improved, improve blast furnace permeability, reach the object reducing coke ratio and increase yield.
Embodiment
The invention will be further described below.A reuse method for metallurgical ferrous dust, method steps is as follows,
A. get the raw materials ready, collect containing metallurgical dusts such as stokehold iron flask dedusting ash, gravitational dust collection ashes, mix with addition of 2 ~ 4% bentonitic ratios in 96% ~ 98% iron dust containing, the TFe content of described iron dust containing is 20 ~ 30%; Iron dust containing and wilkinite composition analysis are in table 1, table 2;
B. pelletizing, by being cold-pressed into playing skill art, above-mentioned iron dust containing and bentonitic mixture being made granularity is 6 ~ 10mm cooled agglomerated pellet or cold-consolidated ball block;
C. sinter, substitute finished product agglomerate as sintering grate-layer material, the waste heat of sintering process is utilized to sinter green-ball, the ultimate compression strength of cooled agglomerated pellet ball under the high temperature action of sintering process reaches 1500 ~ 2000N, on the grid section cooled agglomerated pellet made being laid on sinter machine, laying depth is 20 ~ 30mm, and on cooled agglomerated pellet, laying depth 530 ~ 590mm sinter mixture sinters;
D. enter blast furnace, adjustment blast furnace burden, reduces lump ore consumption, increases agglomerate consumption, and allocates the cooled agglomerated pellet after above-mentioned sintering or cold-consolidated ball block into blast furnace.
Table 1 is the composition analysis of 2 kinds of metallurgical ferrous dusts, and table 2 is bentonitic composition analysis.
Table 12 kinds of metallurgical ferrous dust composition analyses
The composition analysis of table 2 wilkinite
Below in conjunction with concrete example, the present invention is described in detail.Unless otherwise noted, involved in this specification sheets degree is all weight percentage.
Table 3, table 4 show cooled agglomerated pellet different ratio produce the composition of cooled agglomerated pellet, table 5 is blast furnace burden composition analysis.
Table 3 cooled agglomerated pellet batching situation %
| Dedusting ash | Wilkinite | |
| Q1 cold-consolidated ball | 98 | 2 |
| Q2 cold-consolidated ball | 97 | 3 |
| Q3 cold-consolidated ball | 96 | 4 |
The composition analysis of table 4 cooled agglomerated pellet and strength test
| Kind | TFe/％ | CaO/％ | SiO 2/％ | MgO/％ | Ultimate compression strength/N |
| Q1 cold-consolidated ball | 42.77 | 3.5 | 6.5 | 2.5 | 211 |
| Q2 cold-consolidated ball | 42.44 | 3.6 | 7.2 | 2.5 | 246 |
| Q3 cold-consolidated ball | 42.11 | 3.6 | 7.6 | 2.6 | 289 |
Table 5 is blast furnace burden composition situation %
Table 6 shows the blast furnace burden proportioning situation in benchmark example and example 1,2,3,4,5.
Table 6 exemplary scenario
Benchmark example:
Utilize iron dust containing to carry out pelletizing by Q1 proportioning in table 4, Task-size Controlling is that 6 ~ 8mm ratio is greater than 90%, for subsequent use after cold pressing treatment balling-up.Hearth layer for sintering uses general hearth layer for sintering, and gauge control is 20mm, and sinter mixture is thick is 590mm, and control sintering total thickness 610mm, other parameters are by normal running process.Blast furnace heat size is 1750m
3, furnace charge uses agglomerate, pellet, 42 red iron ores and Q1 cooled agglomerated pellet, and charge composition is pressed in table 6 shown in benchmark example, and blast furnace main operating parameters is by normal processing.
Benchmark example result is as follows: conditions of blast furnace direct motion, and blast furnace 10 days average coke ratios are 450.0kg/t, and coal is than being 120kg/t, blast furnace permeability index 1958m
3.min-1.Mpa-1, pig iron ultimate production 40430 tons, ore deposit cost joined by blast furnace is 1134.4 yuan/ton.
Example 1
Utilize iron dust containing to carry out pelletizing by Q1 proportioning in table 4, Task-size Controlling is that 6 ~ 8mm ratio is greater than 90%, for subsequent use after cold pressing treatment balling-up.Hearth layer for sintering uses Q1 cold-consolidated ball to do grate-layer material, and gauge control is 20mm, and sinter mixture is thick is 590mm, and control sintering total thickness 610mm, other parameters are by normal running process.Blast furnace heat size is 1750m
3, furnace charge uses agglomerate, pellet and 42 red iron ores, and charge composition is pressed in table 6 shown in example 1, and blast furnace main operating parameters is by normal processing.
Result is as follows: conditions of blast furnace direct motion, and blast furnace 10 days average coke ratios are 449.4kg/t, and coal is than being 120kg/t, blast furnace permeability index 1987m
3.min-1.Mpa-1, pig iron ultimate production 40617 tons, ore deposit cost joined by blast furnace is 1133.7 yuan/ton.
Example 2
Utilize iron dust containing to carry out pelletizing by Q1 proportioning in table 4, Task-size Controlling is that 6 ~ 8mm ratio is greater than 90%, for subsequent use after cold pressing treatment balling-up.Hearth layer for sintering uses Q1 cold-consolidated ball to do grate-layer material, and gauge control is 25mm, and sinter mixture is thick is 585mm, and control sintering total thickness 610mm, other parameters are by normal running process.Blast furnace heat size is 1750m
3, furnace charge uses agglomerate, pellet and 42 red iron ores, and charge composition is pressed in table 6 shown in example 2, and blast furnace main operating parameters is by normal processing.
Result is as follows: conditions of blast furnace direct motion, and blast furnace 10 days average coke ratios are 448.7kg/t, and coal is than being 120kg/t, blast furnace permeability index 1989m
3.min-1.Mpa-1, pig iron ultimate production 40688 tons, ore deposit cost joined by blast furnace is 1132.8 yuan/ton.
Example 3
Utilize iron dust containing to carry out pelletizing by Q2 proportioning in table 4, Task-size Controlling is that 6 ~ 8mm ratio is greater than 90%, for subsequent use after cold pressing treatment balling-up.Hearth layer for sintering uses Q2 cold-consolidated ball to do grate-layer material, and gauge control is 25mm, and sinter mixture is thick is 585mm, and control sintering total thickness 610mm, other parameters are by normal running process.Blast furnace heat size is 1750m
3, furnace charge uses agglomerate, pellet and 42 red iron ores, and charge composition is pressed in table 6 shown in example 3, and blast furnace main operating parameters is by normal processing.
Result is as follows: conditions of blast furnace direct motion, and blast furnace 10 days average coke ratios are 448.9kg/t, and coal is than being 120kg/t, blast furnace permeability index 1992m
3.min-1.Mpa-1, pig iron ultimate production 40664 tons, ore deposit cost joined by blast furnace is 1132.9 yuan/ton.
Example 4
Utilize iron dust containing to carry out pelletizing by Q3 proportioning in table 4, Task-size Controlling is that 6 ~ 8mm ratio is greater than 90%, for subsequent use after cold pressing treatment balling-up.Hearth layer for sintering uses Q3 cold-consolidated ball to do grate-layer material, and gauge control is 25mm, and sinter mixture is thick is 585mm, and control sintering total thickness 610mm, other parameters are by normal running process.Blast furnace heat size is 1750m
3, furnace charge uses agglomerate, pellet and 42 red iron ores, and charge composition is pressed in table 6 shown in example 4, and blast furnace main operating parameters is by normal processing
Result is as follows: conditions of blast furnace direct motion, and blast furnace 10 days average coke ratios are 449.1kg/t, and coal is than being 120kg/t, blast furnace permeability index 1995m
3.min-1.Mpa-1, pig iron ultimate production 40640 tons, ore deposit cost joined by blast furnace is 1133.0 yuan/ton.
Example 5
For optimum implementation, utilize iron dust containing to carry out pelletizing by Q1 proportioning in table 4, Task-size Controlling is that 6 ~ 10mm ratio is greater than 90%, for subsequent use after cold pressing treatment balling-up.Hearth layer for sintering uses Q1 cold-consolidated ball to do grate-layer material, and gauge control is 25mm, and sinter mixture is thick is 585mm, and control sintering total thickness 610mm, other parameters are by normal running process.Blast furnace heat size is 1750m
3, furnace charge uses agglomerate, pellet and 42 red iron ores, and charge composition is pressed in table 6 shown in example 1, and blast furnace main operating parameters is by normal processing.
Result is as follows: conditions of blast furnace direct motion, and blast furnace 10 days average coke ratios are 448.2kg/t, and coal is than being 120kg/t, blast furnace permeability index 2010m
3.min-1.Mpa-1, pig iron ultimate production 40710 tons, ore deposit cost joined by blast furnace is 1131.4 yuan/ton.
Consider from economic benefit: under normal circumstances, agglomerate grate-layer material accounts for Sintering Yield and is about 2 ~ 4%, if for Xichang steel vanadium iron work, hearth layer for sintering accounts for agglomerate total stuff amount 2.5%, produce the pig iron about 4,000,000 tons per year, need agglomerate to be about 800 tons, then need grate-layer material to be: 800 × 2.5%=20 ten thousand tons.The pelletizing utilizing metallurgical dust to make is as the grate-layer material of agglomerate, this cooled agglomerated pellet directly enters stove Substitute For Partial rawore after carrying out sintering process, for the low-grade lump ore that Xichang steel vanadium uses, full iron is the price of the lump ore of 25% is 200 yuan/ton, if every young use 200,000 tons of lump ores, then total price is: 20 × 20,0=3,200 ten thousand yuan.Ball processed needs 98.5% metallurgical dust+2.5% wilkinite, and wherein iron dust containing trucking costs is 60 yuan/ton, and wilkinite market price is about 700 yuan/ton, then:
Trucking costs is about: (200000 × 97.5%) × 60=,117 ten thousand yuan
Wilkinite expense is needed to be: (200000 × 2.5%) × 7,00=,350 ten thousand yuan
Cooled agglomerated pellet pelletizing processing charges is per ton is about 100 yuan, then processing charges is: 20 × 10,0=2,000 ten thousand yuan
Benefit is: (3200-117-350-2000)=7,330,000 yuan
The ton iron cost reduced: 733 ÷ 400=1.8 yuan/ton.
The inventive method advantage mainly contains three aspects in sum: one is, the cold-consolidated ball made by iron dust containing is as hearth layer for sintering, utilize the waste heat of sintering process that green-ball is carried out roasting when not increasing additional fuel, improve the intensity of pelletizing group of iron dust containing institute, decrease green-ball and directly enter the risk that stove may worsen blast furnace permeability; Two are, the cold-consolidated ball after baking with agglomeration can be utilized to carry out Substitute For Partial lump ore, increase the grog rate of blast furnace burden, reduce consumption and the pig iron cost of blast furnace fuel; Three are, iron dust containing fine size to air and surrounding enviroment seriously polluted, if continuablely this resource can be utilized, effectively can alleviate the environmental protection pressure of Steel Plant instantly.
Above to the reuse method of a kind of metallurgical ferrous dust provided by the present invention, method has carried out exhaustive presentation, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, to change of the present invention and improve will be possible, and design and the scope of accessory claim defined can not be exceeded, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. a reuse method for metallurgical ferrous dust, is characterized in that: method steps is as follows,
A. get the raw materials ready, adopt the iron dust containing of 96% ~ 98% to mix with 2% ~ 4% wilkinite,
B. pelletizing, by being cold-pressed into playing skill art, above-mentioned iron dust containing and bentonitic mixture being made granularity is 6 ~ 10mm cooled agglomerated pellet or cold-consolidated ball block;
C. sinter, substitute finished product agglomerate as sintering grate-layer material, utilize the waste heat of sintering process to sinter green-ball, the ultimate compression strength of cooled agglomerated pellet ball under the high temperature action of sintering process reaches 1500 ~ 2000N;
D. enter blast furnace, adjustment blast furnace burden, reduces lump ore consumption, increases agglomerate consumption, and allocates the cooled agglomerated pellet after above-mentioned sintering or cold-consolidated ball block into blast furnace.
2. the reuse method of a kind of metallurgical ferrous dust according to claim 1, is characterized in that: in step a, and described iron dust containing is that stokehold iron flask dedusting ash, gravitational dust collection ash or bag-type dust are grey.
3. the reuse method of a kind of metallurgical ferrous dust according to claim 1, is characterized in that: in step a, and the TFe content of described iron dust containing is 20 ~ 30%.
4. the reuse method of a kind of metallurgical ferrous dust according to claim 1, it is characterized in that: in step c, on the grid section cooled agglomerated pellet made being laid on sinter machine, laying depth is 20 ~ 30mm, and on cooled agglomerated pellet, laying depth 530 ~ 590mm sinter mixture sinters.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105154667A (en) * | 2015-08-20 | 2015-12-16 | 四川德胜集团钒钛有限公司 | Sintering method for blast furnace |
| CN105219952A (en) * | 2015-08-20 | 2016-01-06 | 四川德胜集团钒钛有限公司 | A kind of blast furnace sinter method utilizing low-heat value gas |
| CN106544498A (en) * | 2015-09-17 | 2017-03-29 | 宝山钢铁股份有限公司 | A kind of iron dust containing high-efficiency sintered method |
| CN109338100A (en) * | 2018-11-29 | 2019-02-15 | 武汉钢铁有限公司 | Make the grate-layer material whole grain method of grate-layer material based on pellet |
| CN111647739A (en) * | 2020-06-17 | 2020-09-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of iron-containing resource |
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| CN101250624A (en) * | 2008-03-31 | 2008-08-27 | 重庆钢铁(集团)有限责任公司 | Technique of dedusting gray for sintered mine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105154667A (en) * | 2015-08-20 | 2015-12-16 | 四川德胜集团钒钛有限公司 | Sintering method for blast furnace |
| CN105219952A (en) * | 2015-08-20 | 2016-01-06 | 四川德胜集团钒钛有限公司 | A kind of blast furnace sinter method utilizing low-heat value gas |
| CN106544498A (en) * | 2015-09-17 | 2017-03-29 | 宝山钢铁股份有限公司 | A kind of iron dust containing high-efficiency sintered method |
| CN106544498B (en) * | 2015-09-17 | 2018-07-06 | 宝山钢铁股份有限公司 | A kind of iron dust containing high-efficiency sintered method |
| CN109338100A (en) * | 2018-11-29 | 2019-02-15 | 武汉钢铁有限公司 | Make the grate-layer material whole grain method of grate-layer material based on pellet |
| CN111647739A (en) * | 2020-06-17 | 2020-09-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of iron-containing resource |
| CN111647739B (en) * | 2020-06-17 | 2022-05-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of iron-containing resource |
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Application publication date: 20150617 |