CN1261598C - Method for reclaiming and reusing iron-making dust in blast furnace - Google Patents
Method for reclaiming and reusing iron-making dust in blast furnace Download PDFInfo
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- CN1261598C CN1261598C CN 200410100490 CN200410100490A CN1261598C CN 1261598 C CN1261598 C CN 1261598C CN 200410100490 CN200410100490 CN 200410100490 CN 200410100490 A CN200410100490 A CN 200410100490A CN 1261598 C CN1261598 C CN 1261598C
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- 239000000428 dust Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 147
- 229910052742 iron Inorganic materials 0.000 claims abstract description 67
- 239000011701 zinc Substances 0.000 claims abstract description 25
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 24
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000009825 accumulation Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 11
- 239000002817 coal dust Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 abstract description 37
- 238000002347 injection Methods 0.000 abstract description 16
- 239000007924 injection Substances 0.000 abstract description 16
- 239000000571 coke Substances 0.000 abstract description 15
- 239000000843 powder Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000002349 favourable effect Effects 0.000 abstract description 7
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 239000010703 silicon Substances 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000024121 nodulation Effects 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 16
- 229910052760 oxygen Inorganic materials 0.000 description 16
- 239000001301 oxygen Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 12
- 239000000203 mixture Substances 0.000 description 11
- 239000002893 slag Substances 0.000 description 11
- 229910000805 Pig iron Inorganic materials 0.000 description 9
- 230000002829 reductive effect Effects 0.000 description 9
- 230000009467 reduction Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005245 sintering Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 208000011580 syndromic disease Diseases 0.000 description 5
- 241000721047 Danaus plexippus Species 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002802 bituminous coal Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- PZZOEXPDTYIBPI-UHFFFAOYSA-N 2-[[2-(4-hydroxyphenyl)ethylamino]methyl]-3,4-dihydro-2H-naphthalen-1-one Chemical compound C1=CC(O)=CC=C1CCNCC1C(=O)C2=CC=CC=C2CC1 PZZOEXPDTYIBPI-UHFFFAOYSA-N 0.000 description 1
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000001149 thermolysis Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a method for recovering iron making dust of a blast furnace. Hop-pocket dust, gravity dust and other iron containing dust are uniformly mixed with coal powder to be sprayed into a furnace hearth from the blast tuyere of the blast furnace with the requirements that the furnace hearth has no accumulation and the furnace throat has no nodulation before injection; the method has the technological parameters: when the hop-pocket dust is injected, the injection amount is from 6 to 10 kg/t iron, the hot blast temperature is higher than 1000 DEG C and the zinc load of the blast furnace is less than 0.15 kg/t iron; when the gravity dust is injected, the injection amount is from 6 to 15 kg/t iron, the hot blast temperature is higher than 1050 DEG C; when other iron containing dust is injected, the injection amount is less than 8 kg/t iron, the particle diameter of the dust is less than 0.5mm and the hot blast temperature is higher than 1050 DEG C. The present invention has the advantages of iron increase, coke saving, environmental protection, clean production, etc., is favorable for molten iron to reduce silicon, and safe coal injection, and promotes the smooth running of the blast furnace, and the intensification smelting.
Description
Technical field
The invention belongs to ironmaking and environmental technology field, reclaim the method that dust utilizes again in particularly a kind of iron-making production.
Background technology
The blast furnace ironmaking process, from furnace roof alternately in stove, pack into ore (enriched ore or natural ore deposit) and coke, from lower furnace (air port at cupola well position) in stove air blast with combustion of coke.Be to reduce coke consumption, present most blast furnaces from the air port in stove coal injection.Iron ore is heated, reduces in the decline process in the blast furnace becomes molten iron at last and regularly discharges from the iron mouth of lower furnace; Coke and the coal dust that sprays into then provide heat and reductive agent for process.
Raw material from furnace roof fall into and in stove the decline process, because of bump, friction generate a certain amount of dust, its amount depends on raw materials quality.The high speed coal gas stream that this part dust is risen in the stove will be caught by fly-ash separator after taking away and leaving blast furnace.Gravitational precipitator (or axial cyclone dust) is adopted in the collection of the thick dirt of larger particles at present, and the collection of thin dirt then has dry method and wet method.The dry method sack cleaner, the most medium and small blast furnaces of China adopt this mode; Wet method Venturi Scrubber (or than Xiao husband washing tower).Table 1 is the composition and the granularity example of iron dust containing in the iron work, and gravity dirt is thick (particle is much in 60～90 μ m, about average 200 μ m), bag dust thin (100～50 μ m account for half).Except that the granularity difference, bag dust contains Zn, Pb and the basic metal amount is higher, and difference of them was particularly evident when these constituent contents were high in ore.
The chemical constitution of table 1 iron dust containing (%)
| TFe | FeO | Fe 2O 3 | SiO 2 | CaO | MgO | Al 2O 3 | ||
| Gravitational dust | China A factory | 43.81 | 11.58 | 49.72 | 10.45 | 6.90 | 2.35 | 1.59 |
| China B factory | 44.14 | 11.52 | 50.25 | 9.16 | 2.00 | 1.13 | 2.74 | |
| Japan monarch Jin Chang | 21.64 | - | - | 5.40 | - | - | - | |
| Bag dust | China B factory | 31.40 | 8.35 | 35.58 | 9.50 | 1.92 | 1.24 | 4.02 |
| China C factory | 26.75 | 8.50 | 28.77 | 8.55 | 6.90 | 2.40 | 1.60 | |
| Japan monarch Jin Chang | 19.41 | - | - | - | - | - | - | |
| Sintering machine tail dirt | China B factory | 48.06 | 5.26 | 62.81 | 5.20 | 12.58 | 3.04 | 2.78 |
| The casting house flue dust | China D factory | 53.28 | 29.83 | 31.61 | 5.70 | 1.00 | 0.30 | 1.30 |
| MnO | P 2O 5 | S | C | Remarks | ||||
| Gravitational dust | China A factory | 2.34 | 0.016 | 0.232 | 15.58 | A factory:＞100 orders 66.74%, 100～200 orders 18.26%,＜200 orders 14.37% |
| China B factory | 0.19 | - | 0.27 | 17.69 | ||
| Japan monarch Jin Chang | - | - | 54.0 | Zn 0.112%, average 0.22mm | ||
| Bag dust | China B factory | 0.22 | - | 0.49 | 29.66 | |
| China C factory | 2.30 | 0.02 | 0.23 | 40.73 | Zn4.25％ | |
| Japan monarch Jin Chang | - | - | - | 42.15 | Wet method is received to such an extent that (moisture 18%) contains Zn0.61% | |
| Sintering machine tail dirt | China B factory | 0.24 | - | 1.01 | 2.32 | |
| The casting house flue dust | China D factory | 0.08 | 0.18 | - | - | Fe7.96％ |
At present, gravitational dust all is used as raw materials for sintering basically, and bag dust is too thin or because of containing zinc height when higher (ore contain zinc) because of particle, is transported to away from plant area more and locates to throw aside; The producer that has partly is used as sintered material, but often causes the sinter strength variation thus, goes into behind the stove fragmentation and is dust again and overflows, and forms poor circulation; For utilizing bag dust, the producer that has adds wilkinite and so on binding agent by sintering process and keeps sintering finished rate, but grade of sinter is reduced, and unfavorable blast furnace strengthening smelting is so the utilization of bag dust is the difficult problem that puzzlement ironmaking is produced.On the other hand, gravitational dust also should have certain proportion as sintered material, and the excessive unfavorable sintering of consumption especially contains zinc when high at iron ore, because of zinc reduction in blast furnace, circulation, enrichment, easily causes stove top dross, so unsuitable many with addition of amount.But higher because of its iron content, hesitate to discard, have to all use, so recycling, it also makes us puzzled part.
At present, the most producer of China ironmaking dust must not make full use of; Part is used as sintered material, has also only reclaimed Fe, and other beneficiating ingredients seldom utilize, so both unfavorable reducing cost, contaminate environment again.
Summary of the invention
At the problem that exists in the existing iron manufacturing process dust recovery and utilization technology, the invention provides a kind of method of iron-making dust in blast furnace recycling.
The present invention sprays into cupola well with iron work iron content carbon containing dust such as blast furnace cloth bag dirt or gravitational dust and coal dust uniform mixing from the air port.The dust that sprays into heats under cupola well high temperature, and its iron content branch is directly reduced enters the pig iron; Contained carbon burns equally with the coal dust that sprays into, and becomes the heat-generating agent and the reductive agent of smelting process; SiO
2, Al
2O
3Wait other components then to participate in slag making, finally discharging out of the furnace with slag is washed into the grain slag recovery.Concrete grammar has following several:
1, spray bag dust
When raw material zinc content little (promptly saying " ore does not contain zinc " usually), bag dust should be first choice of the winding-up dust.
1) composition: each enterprise's blast furnace cloth bag dirt composition differs at present, though its composition of same blast furnace also with material condition change (during routine coke strenth difference, bag dust carbon content height; Bag dust iron divides high during the sinter strength difference), usually full iron amount is more than 25%, and carbon content is more than 30%.The bag dust composition changes to not influence of powder injection process, so the present invention does not have particular requirement to its composition.
2) granularity: be limited to the filter bag space on the granularity and restrict, the maximum particle diameter that may reach is also in 150 μ m, and is promptly suitable with coal powder size, so the present invention does not have particular requirement to the bag dust granularity.
3) straying quatity: 8 ± 2Kg/ ton iron, with coal dust in advance mixing spray into from the air port.Winding-up can spray into cupola well after 10 days if do not present the sign that cools off from the starting of 6Kg/ ton iron, discharge rate can be increased to 8Kg/ ton iron; Still do not have the sign of cooling off again through 10 days, then can increase to 10Kg/ ton iron, even but cupola well state this moment variation not yet, the bag dust straying quatity also should not increase again.
4) other: the zinc load of implementing blast furnace raw material should be lower than 0.15Kg/ iron; Hot blast temperature should be more than 1000 ℃; Oxygen enriched blast is good especially, also can not but there is oxygen enrichment.
Before implementing winding-up, cupola well should not have accumulation, and furnace throat should not have dross.
2, spray gravitational dust
When ore contains a certain amount of zinc, should reduce gravitational dust proportioning in the sintered material, get about 8Kg/ ton iron and spray into (should not spray bag dust this moment) from the air port.
1) composition: the gravitational dust composition depends on raw materials quality equally, its carbon content height during the coke strenth difference; Its iron divides highly during the sinter strength difference, and usually iron-holder is more than 40%, and carbon containing is more than 15%.The gravitational dust composition is to not influence of blowing process, so the present invention does not have particular requirement to its composition.
2) granularity: gravitational dust is a meal dirt, median size is about 0.2mm, indivedual macrobeads also can be greater than 0.5mm, though it is slightly thick than the coal suitable for blowing powder, but unlikely its defeated mealiness energy that influences " is sneaked into raw coal and adds coal pulverizer " flow process as recommend it by the present invention, and then its granularity still can be fined, so the present invention has no special requirements to gravity soot particle degree, but must not sneak into other thicker dust or foreign matters.
3) straying quatity: 8 ± 2Kg/ ton iron, with coal dust in advance mixing spray into from the air port.
Winding-up can be from the starting of 6Kg/ ton iron, and spraying into after 10 days does not have the sign of cooling off as if cupola well, discharge rate can be increased to 8Kg/ ton iron; Still do not have the sign of cooling off again through 10 days, can increase to 10Kg/ ton iron again, as the working of a furnace still no change (furnace temperature and coal combustion rate are not seen reduction) can attempt increasing straying quatity again, but should not be higher than 15Kg/ ton iron at most.
4) other: the zinc load of implementing its raw material of blast furnace with low for good.As be higher than 0.15Kg/ ton iron, when the winding-up gravitational dust, sintered material should be deducted the gravitational dust of equivalent.
Hot blast temperature should be higher than 1050 ℃, and oxygen enriched blast is good especially, also can not but there is oxygen enrichment.
Before implementing winding-up, cupola well should not have accumulation, and furnace throat should not have dross.
3, spray other iron dust containings
Common other iron dust containings of iron work are sintering machine tail dirt and casting house flue dust, common iron content height (more than 48%), carbon containing low (below 3%).After this class dust sprayed into cupola well, the self-heating amount was little, and reduction waits heat absorption many, so straying quatity should not height (should be controlled in the 8Kg/ ton iron).
This class dust mostly is all kinds of cleaning apparatuss and receives, and granularity is usually less than gravitational dust, thus its granularity there is not particular requirement, but must not sneak into macrobead (＞0.5mm) assorted material.
Hot blast temperature should be higher than 1050 ℃, and oxygen enriched blast is good especially, and no oxygen enrichment also can.Before implementing winding-up, cupola well should not have accumulation, and furnace throat should not have dross.
Zinc content to this type of dust should be restricted, and when raw material zinc was loaded greater than 0.15Kg/ ton iron, desire was sprayed this class dust, and then sintered material should lack the counterweight forces ash in right amount.
The concrete operations step is:
1) bag dust that will access with automobile or gravitational dust by allocate into than be distributed in coal yard wait grind on the raw coal tiling bed of material.Should not fetch water when accessing dust, but, also can add water-wet on a small quantity for Working environment is worsened.This adds dirt and goes into the coal process, and the dust thin layer can be distributed in the superiors of raw coal, also can be in the middle of the coal seam, but should not be distributed in the lowest layer.After material was so uniform, principle was got material, so that the dust ratio stably together enters coal pulverizer with raw coal, makes dust, coal dust be able to abundant mixing in the levigate process of raw coal, is blown into stove then by " tiling is directly got ".This technology is the simplest, and dust is fine powder originally, thus can not cause very big burden thus to grinding machine, but coal pulverizer is gone out slightly negative impact of rate.
2) behind existing coal pulverizer, a special-purpose mixing machine is set, 2 °～4 ° at barrel inclination angle, turn round by gear driven, in the coal dust elder generation injecting tube that a certain amount of mill is good, to add in the tube by proportioning through the dust of weighing again, rotate by tube that (1～3min) discharges after making the two mixing, imports the Pulverized Coal Bin of coal injection system again, sprays into cupola well by the coal spraying process requirement.
Dust and still use existing coal powder injection pipeline.Thin and allocate into limitedly because of the dust grain, mixed spray can not produce the significant adverse influence to the pulverized coal feed pipe life-span.As spray the higher dust of iron content and injection rate when higher, the pipe internal pressure on duff pipe road should improve slightly.
Injection parameter:
(1) jetting pressure: still can keep at present (or improving slightly) defeated powder pressure during the winding-up bag dust; Especially during the higher dust of iron content, this pressure should slightly improve the spray gravitational dust.At this moment, under injecting coal quantity＜120Kg/t iron bar spare, the pressure that dusts should improve 0.01～0.02MPa on existing basis, (during spray 10Kg/ iron powdered iron ore, the total crushing increasing degree of pipeline is also only in 10%, so defeated powder pressure needs significantly to improve during a small amount of iron dust containing of spray).
(2) flow velocity of coal dust mixed flow: when a small amount of bag dust of spray, can still keep present actual flow velocity (general 5～8m/s, different) according to stove; When spray iron divided higher dust, flow velocity should slightly improve (10%15%).
(3) Control for Kiln Temperature: dust heats up after spraying into cupola well, heat dissipation is wanted in reduction, so regional area before the air port in the cupola well is had cooling effect, but this there is the thermal compensation effect owing to himself contain combustible carbon and spray into the interior coal dust firing of stove simultaneously, so furnace temperature can obviously not reduce.Consider ferric oxide in the dust to molten iron the silicon effect falls, with the blast furnace of silicon content in pig iron,, be equivalent to improve furnace temperature in fact, so spray into the anxiety of no coldization of cupola well behind the dust as still keeping the base iron silicon content as the temperature of the furnace hearth sign.At the blast furnace that the thermometric condition is arranged, slag iron temperature need be not less than original level behind the dirt that dusts.
Beneficial effect of the present invention is as follows:
1, increase iron: the iron in the dust all reclaims;
2, joint is burnt: the carbon in the dust (main from the breeze in the raw material) sprays into the cupola well tuyere zone, and burning earlier generates CO
2Heat release, part is pressed again
Reaction generates reducing gas CO, and this CO rises in stove, is the reductive agent of smelting process iron and the carrier of heat.
3, silicon falls in favourable molten iron: iron is with Fe in the dust
2O
3And the existence of FeO attitude, under cupola well high temperature, can divide the silicon that reduce to reoxidize furnace interior.Si reduction is a strong endothermic reaction, so can reduce cupola well heat expenditure thus, is beneficial to the reduction coke ratio.According to existing production practice, the ton iron dirt 7～10Kg that dusts can make the siliceous reduction of the pig iron more than 0.02%, sprays 1 ton of dust thus and can save more than the burnt 120Kg.
4, promote direct motion and strengthening smelting: the pulverized coal injection rate generally raises in recent years, makes cupola well coal gas amount increase unfavorable direct motion thus.For this reason, coal powder injection is many to match with oxygen enriched blast, but the too high meeting of oxygen enrichment percentage causes cupola well overheated, and this trend was particularly remarkable when wind-warm syndrome was high, and oxygen enrichment and high wind-warm syndrome make theoretical combustion temperature (t before the air port
Reason) raise, this value is too high will to cause SiO volatilization in the furnace charge, cause hot hanging thus.Spray into dust, its thermolysis meeting is regional area absorption portion heat in blast furnace, so can make t
ReasonSlightly reduce.So, spray into the favourable direct motion of dust in right amount for the higher blast furnace of furnace temperature.
Fe is with Fe in the dust
2O
3And the FeO attitude exists, and its contained oxygen is released during the Fe reduction, and it is the same that this part oxygen and air blast contain oxygen, can play the clean-burning effect of assurance carbon in stove, so the also oxygen enriched blast effect slightly of dirt of dusting.
5, be beneficial to safe coal injection: pulverized coal injection metabituminous coal ratio rises year by year at present, but bituminous coal is inflammable and explosive, so compare with the spray hard coal, is having certain scruples aspect operation and the equipment.A large amount of experiments show, sneak into the inert dust bituminous coal explosivity is weakened greatly, so jet and then carry high-coal ratio with addition of the favourable bituminous coal of dust in right amount.
6, favourable " cleaner production ": " cleaner production " (Cleaner Production) extensively carries out in various countries at present.This theory requires to economize in raw materials and the energy, requires to cut down quantity and the toxicity that generates refuse, product requirement is reduced from material to the disadvantageous effect of refining the product ultimate disposal, that is advocate " Ecological Industrial " and " recycling economy ".The dust of will smelting iron sprays into blast furnace again, meets this principle fully, can be with the dust self-digestion of contaminate environment, or obtain obvious economic benefit, also benefit the society.
7, favourable elimination furnace nodulation: when employing contains the higher furnace charge of zinc, the Zinc compounds of bringing in the stove will be reduced the generation metallic zinc and be the steam rising; On stove top, again can by
Reaction regenerates sticking ZnO, and this ZnO bonding furnace wall promptly forms accretion, even stops up gas up take, makes to smelt to be difficult to carry out.Adopt the present invention, dust sprays into from cupola well, containing the higher Dust Capacity of zinc in the sintered material reduces, furnace roof is brought the minimizing of zinc amount into thus, zinc amount in stove top lump zone (doing the district) circulation, enrichment also reduces, and in the zinc amount of lower furnace (wet district) circulation enrichment, though increase to some extent because of spraying into dust, but the at high temperature unlikely dross that causes, and when wet district round-robin zinc amount increased, the zinc amount of discharging with slag iron by the chemical equilibrium criterion increased, and corresponding therewith stove dust lane goes out the zinc amount to be reduced, the interior zinc circulation of stove that can make of a specified duration weakens, so favourable production and direct motion.
As fully visible, the present invention has and reduces cost and many beneficial effects such as decontamination.
Embodiment
Example 1: spray bag dust (400m
3Level)
Starting condition is as follows:
| Coke ratio Kg/t | Coal compares Kg/t | Blast KPa | Air quantity m 3/min | Roof pressure KPa | Ore deposit consumption t/t iron | Go into stove ore deposit TFe% |
| 430 | 140 | 250 | 1480 | 95 | 1.59 | 59.85 |
| Stockline m | The material system * | Coke load t ore deposit/Jiao t | The pig iron [Si] % | The pig iron [S] % | Basicity of slag CaO/SiO 2 | Slag contains MgO amount % |
| 1.2 | CC↓OO↓ | 4.1 | 0.58 | 0.02 | 1.08 | 9.70 |
Annotate: C is a coke, and O is an ore
The winding-up practice: dust mixes laggard coal pulverizer by 7Kg/ ton iron proportioning with raw coal, 1100 ℃ of wind-warm syndrome, the coal that oxygen enrichment percentage 1.5～2.0% grinds still by original coal when injection parameter (pressure, flow velocity) spray into cupola well from the air port, furnace temperature (showing with [Si]), wind-warm syndrome, ore coke ratio, blast, air quantity are not all adjusted consciously, ANOMALOUS VARIATIONS did not take place in the working of a furnace after industrialness was implemented as a result, productive capacity does not also have considerable change, the beneficiating ingredients such as iron content, carbon, oxygen that make dust thus all fully reclaim.
Example 2: the spray agglomerate dust (1000m that sieves
3The level blast furnace)
The winding-up agglomerate is gone under the ditch of stokehold the wind-force dust that sieves, and characteristic is as follows:
| Chemical constitution % | Size composition % | |||||
| TFe | FeO | Fe 2O 3 | C | ＞100 orders | 100～200 orders | ＜200 orders |
| 56.77 | 6.56 | 73.55 | 1.27 | 24.0 | 38.0 | 38.0 |
Spray into ratio: 8.7Kg/ ton iron; Jetting pressure: 4.5Kg/cm
2(when just leaving powder spraying pot); Test period: 58 days.
The main productive capacity contrast of trial period and base period (dirt does not dust) is as follows:
| Utilization coefficient t/ (m 3.d) | Ratio of first-grade products % | Coke ratio Kg/t | Coal compares Kg/t | Comprehensive coke ratio Kg/t | Combustion intensity (comprehensive t/m 3.d) | Delay ratio % | |
| Base period | 1.819 | 79.2 | 493 | 84 | 560 | 1.050 | 0.71 |
| Trial period | 1.814 | 85.4 | 493 | 71 | 550 | 1.021 | 0.36 |
| Air quantity m 3/min | Wind-warm syndrome ℃ | Blast KPa | Roof pressure KPa | Coke load t/t | Standard wind speed m/s | Pig iron qualification rate % | Molten iron temperature ℃ | |
| Base period | 2256 | 1049 | 182 | 85 | 3.75 | 127 | 100 | 1372 |
| Trial period | 2185 | 1064 | 175 | 80 | 3.73 | 126 | 100 | 1433 |
| Slag temperature ℃ | The pig iron [Si] % | The pig iron [S] % | Basicity of slag Cao/SiO 2 | Slag contains S % | Sulphur content distribution coefficient Ls | |
| Base period | 1456 | 0.631 | 0.021 | 1.09 | 0.74 | 35.2 |
| Trial period | 1476 | 0.584 | 0.021 | 1.09 | 0.73 | 35.9 |
Therefore when the amount of dusting was not high, productive capacity can considerable change, but made iron in the dust, carbon, oxygen obtain reclaiming thus.It is worthy of note that silicon content in pig iron slightly reduces and slag iron temperature slightly raises behind the dirt that dusts, show that ferric oxide sprays into the back and molten iron has been manifested falls the silicon effect, also reduced cupola well heat expenditure thus.
Claims (1)
1, the method recycled of a kind of iron-making dust in blast furnace is characterized in that dust and the coal dust uniform mixing that will reclaim in the blast furnace ironmaking process spraying into cupola well from blast-furnace tuyere, and its processing parameter is:
(1) described dust is a bag dust: straying quatity is 6Kg/t iron～10Kg/t iron, from low to high, increases gradually; Hot blast temperature＞1000 ℃, blast furnace raw material zinc load＜0.15Kg/t iron requires cupola well not have accumulation before the winding-up, and furnace throat does not have dross;
(2) described dust is a gravitational dust: straying quatity is 6Kg/t iron～15Kg/t iron, from low to high, increases gradually, and hot blast temperature＞1050 ℃ before the winding-up, require cupola well not have accumulation, and furnace throat does not have dross;
(3) described dust is other iron dust containing: straying quatity≤8.7Kg/t iron, and dust size＜0.5mm, hot blast temperature＞1050 ℃, before the winding-up, cupola well does not have accumulation, and furnace throat does not have dross.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410100490 CN1261598C (en) | 2004-12-28 | 2004-12-28 | Method for reclaiming and reusing iron-making dust in blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410100490 CN1261598C (en) | 2004-12-28 | 2004-12-28 | Method for reclaiming and reusing iron-making dust in blast furnace |
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| CN1632136A CN1632136A (en) | 2005-06-29 |
| CN1261598C true CN1261598C (en) | 2006-06-28 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100463974C (en) * | 2007-03-21 | 2009-02-25 | 鞍钢股份有限公司 | Blast Furnace CDQ Coke Powder Injection Technology and Equipment |
| US8986601B2 (en) | 2009-11-24 | 2015-03-24 | Central Iron & Steel Research Institute | Method for iron-making with full oxygen and hydrogen-rich gas and equipment thereof |
| CN102409118B (en) * | 2010-09-21 | 2013-09-04 | 鞍钢股份有限公司 | Recycling process and equipment for iron-and carbon-containing dust |
| CN103181520A (en) * | 2013-03-19 | 2013-07-03 | 福建省农业科学院农业生物资源研究所 | Preparation method for dendrobium officinale and lactic acid bacteria capsule |
| CN105112583B (en) * | 2015-10-13 | 2017-03-15 | 武钢集团昆明钢铁股份有限公司 | A kind of method for allocating State of Blast Furnace past raising coal combustion rate in injection coal into |
| CN107779591B (en) * | 2017-12-05 | 2019-05-03 | 太原钢铁(集团)有限公司 | A kind of method of grate kiln coal powder injection production pellet |
| CN109385501A (en) * | 2018-10-29 | 2019-02-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of steel industry dedusting ash is handled using blast furnace iron runner, iron flask, mixed iron blast, converter blowing melting process |
| CN112063781A (en) * | 2019-06-10 | 2020-12-11 | 上海梅山钢铁股份有限公司 | Coke powder-containing mixed fuel for blast furnace coal injection and preparation method thereof |
| CN111850195B (en) * | 2020-06-29 | 2021-05-07 | 北京科技大学 | A method for treating zinc-containing solid waste in an iron and steel plant by an environmentally-friendly improved blast furnace |
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