CN101994002B - Method for sintering ore blending of Jianshan concentrate fines and limonite - Google Patents
Method for sintering ore blending of Jianshan concentrate fines and limonite Download PDFInfo
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- CN101994002B CN101994002B CN200910075221A CN200910075221A CN101994002B CN 101994002 B CN101994002 B CN 101994002B CN 200910075221 A CN200910075221 A CN 200910075221A CN 200910075221 A CN200910075221 A CN 200910075221A CN 101994002 B CN101994002 B CN 101994002B
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Abstract
The invention discloses a method for sintering ore blending of Jianshan concentrate fines and limonite, which comprises the following steps of: (1) preparing materials at a sintering site; (2) pre-humidifying Yangdi fines; (3) preparing iron materials; (4) blending the prepared iron materials, flux and fuel; (5) mixing the materials in a primary mixer; (6) pelletizing in a secondary mixer; (7) forcefully pelletizing in a ternary mixer; (8) distributing and pressing the materials; (9) igniting and keeping temperature; (10) sintering by pumping air; (11) cooling; (12) granulating. The method is mainly characterized in that: when the Yangdi fines are pre-humidified, the pre-humidifying moisture reaches 8.5 to 9.5 percent; in step (3), the iron materials comprise 40 to 50 parts of Jianshan fines, 33.5 to 43.5 parts of humidified Yangdi fines, 10 to 16 parts of pilbarablend (PB) fines and 0 to 4 parts of mixed fines; and in step (4), the mass part ratio of the mixed iron materials to blast-furnace return mine to lime to dolomite to coke powder is 77.8-78.8: 7-8: 4.8-5.7: 6-7: 2-3. In the invention, the ore blending is low in cost and cheap minerals are used rationally.
Description
Technical field
The present invention relates to a kind of sharp mountain fine ore and limonite and join the sintering method in ore deposit, specifically is sharp mountain fine ore and limonite is at high proportion joined the sintering method in ore deposit.
Background technology
In order to strengthen enterprise competitiveness, reduce blast-melted smelting cost, be necessary in the sintering admixtion some cheap ores of adapted as far as possible, and cheap ore is generally ore hard to manage, sintering character is relatively poor.Like the Yang Dikuang in the limonite (YANDI FINES); Its crystal water content is high, low, the short texture of fusing point; When bearing high temperature suddenly; The mass crystallization water meeting fierceness evaporation that it includes causes the rapid expansion of volume and causes granulation bead generation explosion pulverizing in the bed of material, has a strong impact on bed permeability; And in sintering process, be prone to form a large amount of liquid phases at bed of material middle part, flow and make the agglomerate structure be the macropore thin-wall construction, strength degradation; Worsen the hot ventilation property of sinter bed simultaneously, cause the chassis bottom raw material to occur, reduce sintering finished rate, productivity descends.Japan has carried out a large amount of transformations for vast scale adapted limonite to sintering process, has developed the classification granulation, has selected to granulate and HPS (pellet sintering method) technology.Baosteel is studied this ore deposit, has formed limonite and ground hematite and has joined ore deposit agglomerating method.This method shortcoming ground hematite is an outsourcing import breeze, makes that the Iron Ore Matching in Sintering cost is higher; Can not utilize the thin fine ore resource of domestic cheapness, sintering needs solid fuel consumption high.Advantage is that the original ventilation property of sinter bed is better.
The self-produced fine ore point of applicant mountain powder degree is very thin, and-200 orders are more than 95%, and the content of-325 purposes reaches more than 80%; Because its crystal grain is superfine, very responsive to moisture, the adequate moisture interval is narrower; Sintering velocity is very fast, and wide between the softened zone, belongs to the unique breeze of a kind of sintering character.Central South University was once studied this ore deposit sintering character, if the sintering parameter can not rationally be controlled, will cause stopping working.With this ore deposit with join the ore deposit with voltinism and the mobile all good enlightening ore deposit of raising, can increase the weight of the deterioration effect of sintering process ventilation property, therefore, these two kinds of ores will cooperate sintering, at home and abroad can use for reference beyond example.
Summary of the invention
Join the above-mentioned deficiency of ore deposit sintering technology in order to overcome existing sharp mountain fine ore and limonite, the present invention provides a kind of ore deposit cost of joining low and what guarantee sinter quality is main with sharp mountain fine ore, joins the ore deposit sintering method with brown ocher at high proportion.
Point mountain breeze granularity is thin (seeing table 1) very, and-325 order content reach more than 86%, and it is to moisture-sensitive; The adequate moisture interval is narrow, and sintering velocity is very fast, wide between the softened zone (seeing table 2); Central South University once carried out agglutinating test with this ore deposit; The ratio in Jian Shan ore deposit is too high, and parameter control is bad, will cause sintered material flame-out.Therefore, join the ore deposit, need find out rational proportion and the suitable ore deposit kind of joining with a high proportion of sharp mountain breeze and limonite at high proportion.On the condition of utilizing existing processing unit, most important to the adjustment of sintering process parameter.
The sharp mountain of table 1 fine ore size composition table
Table 2 sharp mountain magnet fine mineral powder and ground hematite softening performance detected result table
| Title | The beginning softening temperature | Softening finishing temperature | Between the softened zone |
| Point mountain powder | 1470 | 1515 | 45 |
| Raise the enlightening powder | 1380 | 1465 | 85 |
| PB powder * | 1460 | 1485 | 25 |
Annotate
*: the PB powder is writing a Chinese character in simplified form of PILBARABLEND FINES.
Both at home and abroad the adapted limonite generally adopts limonite and rhombohedral iron ore to join the ore deposit, and the applicant with superfine sharp mountain magnet fine mineral powder and at high proportion limonite join the ore deposit.Ultra-fine magnet fine mineral powder is joined the ore deposit sintering method with limonite at high proportion and is at first considered the Optimization Ore Matching structure, and iron charge proportion by weight of the present invention is:
Point mountain fine ore 45～50 is raised enlightening breeze 32～40
Assorted breeze is meant the recovery breeze that is scattered in process of production.
The mass percent of the Chemical Composition of above mineral is seen table 3.
Table 3 breeze Chemical Composition table
| Title | TFe | FeO | SiO 2 | Al 2O 3 | CaO | MgO | P | S | Ig |
| Raise the enlightening powder | 57.73 | 0.59 | 5.79 | 1.77 | 0.073 | 0.080 | 0.037 | 0.010 | 10.38 |
| Point mountain powder | 68.9 | 27.42 | 3.92 | 0.19 | 0.27 | 0.35 | 0.01 | 0.026 | 0.45 |
| The PB powder | 62.05 | 0.14 | 3.98 | 2.13 | 0.049 | 0.1 | 0.066 | 0.018 | 3.91 |
| Assorted breeze | 51.42 | 26.01 | 4.55 | 0.87 | 8.55 | 1.76 | 0.04 | 0.24 | 12.23 |
Grasp the normal temperature characteristic and the hot properties of powdered iron ore, the advantage of two kinds of resources of performance domestic and imported is used principle of complementarity and method and is carried out the scientific and reasonable ore deposit of joining, and further optimizes the quality and the performance of enriched ore comprehensively.
To sharp mountain powder, the high-temperature behavior of raising enlightening powder, PB powder, comprise that assimilation performance, liquid phase flow property, bonding concrete mutually mechanism, calcium ferrite generative capacity detect, detected result is seen Fig. 1 to Fig. 4 and table 4.
Table 4 breeze high-temperature behavior table
| Product | The assimilation performance | The liquid phase flow performance | Bonding phase intensity | The calcium ferrite generative capacity | Comprehensive evaluation |
| The point mountain | A little less than | Difference | Medium higher | Very poor | Have poor assimilation and flowing property, phase intensity is high but himself bonds.Be suitable for and have better with voltinism and flowability, the breeze that the calcium ferrite generative capacity is good matches. |
| Yang Di | Very strong | Good | Low | Fine | Have good assimilation and flowing property, bonding phase intensity is low.. can join the ore deposit with, bonding mineral that mutually intensity high relatively poor with voltinism. |
| The PB powder | By force | Better | Medium | Good | Have preferably assimilation and flowing property, and medium self bonding phase intensity, belong to the mineral of performance balance.Can be suitable for and have than low flow, the breeze of high-self bonding phase intensity matches. |
The result joins the ore deposit design by this table, and sharp mountain, Yang Di and Australia's PB powder are joined the ore deposit, and the ore deposit scheme of selecting of joining is:
Point mountain breeze 45～50 is raised enlightening breeze 32～40
Optimizing the best that joins the ore deposit scheme and is:
Point mountain breeze 47 is raised enlightening breeze 35
PB powder 14 assorted breezes 4
The iron charge admixtion of processing with this iron charge mix proportion scheme cooperates with 12～12.5% flux, 4～5% coke powder and carries out sintering.
This sharp mountain fine ore and limonite are at high proportion joined the sintering method in ore deposit for comprising following sequential steps:
(1) get the raw materials ready in the sintering stock ground, (two) raise that the enlightening ore deposit is wetting in advance, (three) iron charge batching, (four) cooperate iron charge and flux and fuel batching, (five) mixer batch mixings, (six) rerolling mechanism grain, No. (seven) three mixers strengthen granulate, (eight) clothes and binder, (nine) igniting are cooled off with insulation, (ten) down draft sintering, (11), (12) whole.
Concrete steps are following:
(1) get the raw materials ready in the sintering stock ground
Receive various iron charges, flux (rhombspar), coke powder at stock yard.These raw materials are transported to the groove of ore deposit from the stock ground again, participate in batching.Wherein: the granularity of flux, fuel requires percentage composition less than 3mm greater than 80%.The best tank car transportation of lime is not stored in the stock ground.
(2) it is wetting in advance to raise the enlightening ore deposit
Raise after the enlightening ore deposit transports to the concentrate storehouse; Raise the enlightening ore deposit to thousands of tons of to hundreds of tons of single job in the concentrate storehouse sprays water wetting; Can spray also that to add spray water xi wetting in batching disk blanking place to Yang Dikuang, injection flow rate is to raise 9.89% of enlightening ore deposit weight, guarantees that preparatory wetting moisture reaches 9 (± 0.5) %.[amount of water/(Yang Dikuang+amount of water) * 100%]
(3) iron charge batching
With sharp mountain breeze, raise enlightening breeze, PB powder and assorted breeze and flow out through the batching disk by separately batching ore deposit groove; Point mountain breeze, the quality proportioning of raising the flow in unit time of enlightening breeze, PB powder and assorted breeze are (time can be hour also can be minute); (80-100), (67-87), (20-32) with (0-8); Raise and just participate in batching after the enlightening powder adds water-wet, the proportion by weight of the iron charge admixtion after the cooperation is:
After guaranteeing mixing, wherein the proportion by weight of pulp is:
Point mountain breeze 45～50 is raised enlightening breeze 32～40
(4) cooperate iron charge and flux and fuel batching
With iron charge admixtion, blast furnace return mine, lime, rhombspar and coke powder install to respectively in the groove of corresponding batching ore deposit; To proportioning belt, iron charge admixtion, blast furnace are returned mine, lime, rhombspar are (77.8～78.8), (7～8), (4.8～5.7), (6～7) and (2～3) with the quality proportioning of the flow of the unit time of coke powder through separately batching disk blanking.Guarantee that iron charge compound, blast furnace are returned mine in the mixed sintering admixtion, the proportion by weight of lime, rhombspar and coke powder is:
Iron charge admixtion 77.8～78.8 blast furnaces return mine 7～8
Lime 4.8～5.7 rhombspars 6～7 coke powders 2～3
It is wetting raising the enlightening breeze in the sintering admixtion.
(5) mixer batch mixings
The sintered material for preparing is transported in a mixer through belt carries out the mixing operation.In mixer, locate to begin to spray water wetting compound apart from 2.5～3.5 meters of discharging point levels (being 1.5 meters originally), to strengthen mixing, amount of water is 0.4～0.5 ton/minute
(6) rerolling mechanism grain
After a mixer carries out mixing, get into rerolling mechanism grain, the amount of water of rerolling machine is 0.08～0.12 ton/minute.
No. (seven) three times mixers are strengthened granulation
Behind the rerolling machine batch mixing, get into No. three mixers and strengthen granulation, the amount of water of No. three mixers is 0.01～0.05 ton/minute.Behind No. three the mixer batch mixings, the water yield in the sinter mixture is 6.9 (± 1) %; [amount of water/(dry mix+amount of water) * 100%],
(8) cloth and binder
Sintering admixtion behind the mixing granulation is spread on the Dwight-Lloyd sintering machine, and bed depth is 710mm～725mm behind the cloth, and ultra breast board 10～25mm, binder height are 30～40mm.
(9) igniting and insulation
Ignition temperature control is as the criterion with charge level Fa Lanse, and ignition temperature is 1030 ℃ to 1060 ℃, and the negative pressure of the bellows (apart from the about 5.5m of head) below the corresponding holding-zone is adjusted to 2.5Kpa～3Kpa, 450 ℃～550 ℃ of holding temperatures (being 300 ℃ originally).
(10) down draft sintering
The material travelling speed of sinter machine is 1m/min～1.2m/min, and the sintering negative pressure is: 11Kpa～12Kpa.
(11) cooling
The material block sintering that sintering is gone out is transported to and carries out the air blast cooling in the central cooler, and cooled agglomerate temperature is not higher than 120 ℃,
(12) whole grain
Cooled material block sintering is transported to sieves whole grain between screening, tell less than the returning mine of 5mm, greater than 5mm is qualified sinter.
The sintering method that above-mentioned sharp mountain fine ore and limonite are joined the ore deposit is characterized in that:
(3) iron charge batching
Point mountain breeze, the quality proportioning of raising interior flow of unit time of enlightening breeze, PB powder and assorted breeze are 90: 77: 26: 7, and the proportion by weight after the cooperation is:
The point mountain breeze 45 wetting enlightening breezes 38.5 (having added the water of raising enlightening ore deposit 9% relatively) of raising
PB powder 13 assorted breezes 3.5
After guaranteeing mixing, wherein the proportion by weight of pulp is:
Point mountain breeze 47 is raised enlightening breeze 35
PB powder 14 assorted breezes 4
(4) cooperate iron charge and flux and fuel batching
Iron charge admixtion, blast furnace are returned mine, the quality proportioning of the flow of the unit time of lime, rhombspar and coke powder is 78.3: 7.5: 5.2: 6.5: 2.5.Guarantee that iron charge compound, blast furnace are returned mine in the mixed sintering admixtion, the proportion by weight of lime, rhombspar and coke powder is:
Iron charge admixtion 78.3% blast furnace returns mine 7.5
Lime 5.2 rhombspars 6.5 coke powders 2.5
The enlightening breeze of raising in the iron charge compound is wetting.
(5) mixer batch mixings
In mixer, the wetting compound that begins to spray water apart from 3 meters of discharging point level, amount of water is 0.43 ton/minute.
(6) rerolling mechanism grain
The amount of water of rerolling machine is 0.117 ton/minute.
No. (seven) three times mixers are strengthened granulation
The amount of water of No. three mixers is 0.03 ton/minute.Behind No. three the mixer batch mixings, the water yield in the sinter mixture is 6.9 (± 1) %
(8) cloth and binder
Sinter mixture behind the mixing granulation is spread on the Dwight-Lloyd sintering machine, and bed depth is 720mm behind the cloth, and ultra breast board 20mm, binder height are 35mm.
(9) igniting and insulation
The negative pressure of No. 3 bellows of holding-zone is adjusted to 3Kpa, 500 ℃ of holding temperatures.
(12) whole grain
Once screening gets into crusher greater than the screen overflow of 50mm and carries out fragmentation, and the spacing between the breaker roll is 50mm; Agglomerate after the fragmentation with once the screening in screen underflow converge; Carry out regrading again, greater than 5mm be qualified sinter, return mine less than the conduct of 5mm.
This sharp mountain fine ore and limonite are joined in the sintering method in ore deposit; The grasp principle of producing fuel ratio (sintered material proportioning) is: controlled by proportioning by original changing in advance by FeO content feedback control; At first satisfy the needs of bed of material overall thermal income; (in the down draft sintering step) secondly reaches good hot ventilation property (in the down draft sintering step, i.e. the thickness of the flourishing layer of attenuate).Can realize that above two can guarantee comparatively ideal intensity index joining on the carbon (cooperating iron charge and flux and fuel batching step).With the flourishing layer thickness of sintering machine tail account for the bed of material 1/3rd to 2/5ths, brightness is slightly dazzling for good.
Supplementary measures
(1) limonite is carried out in advance wetting to about 9%.
(2) with sharp mountain fine ore with raise the enlightening ore deposit and join the ore deposit, the water cut of control compound is 6.9 (± 1) %; [amount of water/(dry mix+amount of water) * 100%], joining the ore deposit with rhombohedral iron ore increases by 0.3 percentage point.
(3) possesses the condition of three mixed pelletizations according to the applicant; To limonite wetting in advance after; Adjusted the amount of water operation of each section mixer, will add 85% moisture, added 15% moisture in the second drum mixer and be adjusted into by original (being original method) spray in mixer: in mixer with addition of 75% amount of water; In the two defective material mixers with addition of 20% the interpolation water yield, in No. three mixers again with addition of 5% the interpolation water yield (spray water xi).
(4) size of ignition furnace heat input is pressed the height control of limonite proportioning, under the high mixture ratio condition, reduces igniting heat input, and the control principle of ignition temperature is: the surface is as the criterion with Fa Lanse, adjusts ignition temperature; Be 32～40% o'clock in the limonite proportioning promptly, the ignition temperature setting range is 1030～1060 ℃.
(5) limonite will lose crystal water in sintering process, can need more heat energy, should suitably strengthen fuel ratio; And the applicant also is furnished with the magnet fine mineral powder point mountain powder of larger proportion, and it is heat release in reaction process, and it is smaller relatively that sharp mountain and limonite are joined the heat that the ore deposit sintering joins ore deposit sintering needs with limonite and ground hematite.Grope through experiment, the fuel mass proportioning is controlled at 4.6～4.8%, 0.1 percentage point of more former increase under this patent design proportioning situation.
Because it is more to raise the big grain size content in enlightening ore deposit, generally in the cloth process, because therefore particle segregation meeting cloth, require the bottom fuel granularity to increase, and should reach 22% greater than the percentage composition of 3mm in the bottom of chassis.For intensified-sintered mineral amount, carried out the inside and outside fuel ratio optimization of joining, in join and wrap up in fuel outward and respectively account for 50%.
Beneficial effect of the present invention
1 at applicant 2 * 100m
2Adopt ultra-fine sharp mountain fine ore 47% and 35% to raise the assorted breeze of enlightening ore deposit+14% Australia PB powder+4% under the sinter machine 720mm bed depth condition and join the ore deposit, machine speed is brought up to 1.1m/min by 0.95m/min;
2 through implementing effective supplementary measures, at agglomerate SiO
2Content is 5～5.1%, sintering basicity (CaO/SiO
2) be 1.8～1.9 o'clock, obtained sintering utilization coefficient average out to 1.32t/m
2H and is not on close level before the adapted limonite, and barrate strength brings up to 75.7% by 75.3%, reduces to 5.83% less than the content of 5mm by 6.33%;
3 ultra-fine sharp mountain fine ores are joined the ore deposit sintering method Iron Ore Matching in Sintering cost cheap ore of low, reasonable utilization and are guaranteed that sinter quality does not glide with limonite at high proportion, satisfy blast furnace high target operating requirement fully.
Description of drawings
Fig. 1 is to sharp mountain powder, raises enlightening powder, Kazakhstan powder, India's powder assimilation performance map.
Fig. 2 is to sharp mountain powder, raises the enlightening powder, breathes out powder, India powder liquid phase flow sex index figure.
Fig. 3 is to sharp mountain powder, raises enlightening powder, Kazakhstan powder, India's powder bonding concrete mutually intensity map.
Fig. 4 is to sharp mountain powder, raises the enlightening powder, breathes out powder, India powder calcium ferrite generative capacity figure.
Embodiment
Specify the embodiment that this sharp mountain fine ore and limonite are at high proportion joined the sintering method in ore deposit below in conjunction with embodiment, but the embodiment that this sharp mountain fine ore and limonite are at high proportion joined the sintering method in ore deposit is not limited to following embodiment.
Embodiment one
This sharp mountain fine ore and limonite are at high proportion joined the sintering method in ore deposit for comprising following sequential steps:
(1) get the raw materials ready in the sintering stock ground, (two) raise that the enlightening ore deposit is wetting in advance, (three) iron charge batching, (four) cooperate iron charge and flux and fuel batching, (five) mixer batch mixings, (six) rerolling mechanism grain, No. (seven) three mixers strengthen granulate, (eight) clothes and binder, (nine) igniting are cooled off with insulation, (ten) down draft sintering, (11), (12) whole.
Concrete steps are following:
(1) sintered material is got the raw materials ready
Receive various iron charges, flux, coke powder in a stock ground.Point mountain powder is directly expected ground, stock ground down through belt, and import breeze (PB powder, raise the enlightening powder) is discharged to the stock ground through tippler from train and expects on the bar; In the flux rhombspar be from the train roping to the stock ground, lime be through the tank car roping to batching ore deposit groove; Coke powder is to be transported to the stock ground through automobile to get the raw materials ready.The iron charge in all stock grounds is transported to the concentrate storehouse through big belt; Rhombspar (less than 20mm) is transported to the fusing agent ore groove through excessive belt and carries out break process again; Handle suitable granularity (less than 3mm content greater than 80%) and participate in sintered material; Coke powder is the same with rhombspar, also is to supply sintered material to use through break process to suitable granularity (less than 3mm content greater than 80%), and the direct handling of lime is in the groove of lime ore deposit.
(2) it is wetting in advance to raise the enlightening ore deposit
Raise after the enlightening ore deposit is transported to the concentrate storehouse; To in the concentrate storehouse 4000 tons raise enlightening ore deposit (quantity of single job) (4% water cut; Contain 160 tons of water approximately) spray water wetting; In batching disk blanking place Yang Dikuang is sprayed that to add spray water xi wetting, injection flow rate is about 236 tons, guarantees that preparatory wetting moisture reaches 9% again.[amount of water/(Yang Dikuang+amount of water) * 100%]
(3) iron charge batching
With sharp mountain breeze, raise enlightening breeze, PB powder and assorted breeze and flow out through the batching disk by separately batching ore deposit groove; Point mountain breeze, the flow of raising enlightening breeze, PB powder and assorted breeze are respectively 225 tons/hour, 192.5 tons/hour, 65 tons/hour and 17.5 tons/hour; Raise the enlightening powder and just participate in batching after by water-wet, the proportion by weight of the iron charge admixtion after the cooperation is:
The point mountain breeze 45 wetting enlightening breezes 38.5 (having added the water of raising enlightening ore deposit 9% relatively) of raising
PB powder 13 assorted breezes 3.5
After guaranteeing mixing, wherein the proportion by weight of pulp is:
Point mountain breeze 47 is raised enlightening breeze 35
PB powder 14 assorted breezes 4.
(4) cooperate iron charge and flux and fuel batching
With iron charge admixtion, blast furnace return mine, lime, rhombspar and coke powder install to respectively in the groove of corresponding batching ore deposit; To proportioning belt, iron charge compound, blast furnace are returned mine, the flow of lime, rhombspar and coke powder is respectively 392 tons/hour, 37.5 tons/hour, 26 tons/hour, 32.5 tons/hour and 12.5 tons/hour through separately batching disk blanking.Guarantee that iron charge compound, blast furnace are returned mine in the mixed sintering admixtion, the proportion by weight of lime, rhombspar and coke powder is:
Iron charge admixtion (it is wetting wherein raising the enlightening breeze) 78.3 blast furnaces return mine 7.5
Lime 5.2 rhombspars 6.5 coke powders 2.5.
(5) mixer batch mixings
The sintering admixtion for preparing is transported in a mixer through belt carries out the mixing operation.In mixer, locate to begin to spray water wetting compound apart from 3 meters of discharging point levels (being 1.5 meters originally), to strengthen mixing, amount of water is 0.43 ton/minute (210 tons/8 hours)
(6) rerolling mechanism grain 6
After a mixer carries out mixing, get into rerolling mechanism grain, the amount of water of rerolling machine is 0.117 ton/minute.
No. (seven) three times mixers are strengthened granulation
Behind the rerolling machine batch mixing, get into No. three mixers and strengthen granulation, the amount of water of No. three mixers is 0.03 ton/minute.Behind No. three the mixer batch mixings, the water yield in the sinter mixture is 6.9 (± 1) %; [amount of water/(dry mix+amount of water) * 100%],
(8) cloth and binder
Sinter mixture behind the mixing granulation is spread on the Dwight-Lloyd sintering machine, and bed depth is 720mm behind the cloth, and ultra breast board 20mm, binder height are 35mm.
(9) igniting and insulation
Ignition temperature control is as the criterion with charge level Fa Lanse, and ignition temperature is 1030 ℃ to 1060 ℃, and the negative pressure of No. 3 bellows of corresponding holding-zone (apart from the about 5.5m of head) is adjusted to 3Kpa, 500 ℃ of holding temperatures (being 300 ℃ originally).
(10) down draft sintering
The material travelling speed of sinter machine is 1～1.2m/min, and the sintering negative pressure is: 11～12Kpa.
(11) cooling
The material block sintering that sintering is gone out is transported to and carries out the air blast cooling in the central cooler, and cooled agglomerate temperature is not higher than 120 ℃,
(12) whole grain
Cooled material block sintering is transported between screening once sieves; Screen overflow entering crusher greater than 50mm carries out fragmentation; Spacing between the breaker roll is 50mm, the agglomerate after the fragmentation with once the screening in screen underflow converge, carry out regrading again; Greater than 5mm be qualified sinter, return mine less than the conduct of 5mm.
In the present embodiment; The grasp principle of producing fuel ratio (sintered material proportioning) is: controlled by proportioning by original changing in advance by FeO content feedback control; At first satisfy the needs of bed of material overall thermal income; (in the step 10) secondly reaches good hot ventilation property (step 10, the i.e. thickness of the flourishing layer of attenuate).(step 4) can realize that above two can guarantee comparatively ideal intensity index on the carbon joining.With sintering machine tail
Flourishing layer thickness account for the bed of material 1/3rd to 2/5ths, brightness is slightly dazzling for good.
Because the applicant has the outer fuel system of joining, (mix and set up a small mine box between three times are mixed two,
Adopt dilatory belt scale to join fuel system outward; The outer fuel system of joining is joined fuel system in can being placed on) in order to guarantee limonite sintering chassis heat properly distributed, internally, outer fuel adjusts, in join fuel and adjust to 50% by original 80%; Join fuel outward and adjust to 50% by original 20%; The blanking amount is 12.5 tons/hour, falls mixed-3 belts and gets into No. three mixers, strengthens granulation and wraps up in fuel outward.
Embodiment two
The difference of present embodiment and embodiment one is not assorted breeze in the iron charge admixtion of step (three) iron charge batching, and the proportion by weight of iron charge admixtion is:
Point mountain breeze 45 wetting enlightening breeze 38.5 (having added the water of raising enlightening ore deposit 9% relatively) the PB powder 13 of raising
After guaranteeing mixing, wherein the proportion by weight of pulp is:
Point mountain breeze 47 is raised enlightening breeze 35 PB powder 14.
Other step is identical with embodiment's one.
Claims (2)
1. sharp mountain fine ore and limonite are joined the sintering method in ore deposit, and it comprises following sequential steps:
(1) get the raw materials ready in the sintering stock ground
Receive various iron charges, flux, coke powder at stock yard, these raw materials are transported to the groove of ore deposit from the stock ground again, participate in batching, and the granularity of flux, fuel wherein requires percentage composition less than 3mm greater than 80%;
(2) it is wetting in advance to raise the enlightening ore deposit
Raise after the enlightening ore deposit transports to the concentrate storehouse; Raise the enlightening ore deposit to thousands of tons of to hundreds of tons of single job in the concentrate storehouse sprays water wetting; Batching disk blanking place sprays to Yang Dikuang that to add spray water xi wetting, and injection flow rate is to raise 9.89% of enlightening ore deposit weight, guarantees that preparatory wetting moisture reaches 8.5%-9.5%;
(3) iron charge batching
With sharp mountain fine ore, raise enlightening breeze, PB powder and assorted breeze and flow out through the batching disk by separately batching ore deposit groove, sharp mountain fine ore, the quality proportioning of raising interior flow of unit time of enlightening breeze, PB powder and assorted breeze are:
Point mountain fine ore 80-100; Raise enlightening breeze 67-87;
PB powder 20-32; Assorted breeze 0-8;
Raise and just participate in batching after the enlightening breeze adds water-wet, the proportion by weight of the iron charge admixtion after the cooperation is:
Point mountain fine ore 40～50 wetting enlightening breezes 33.5～43.5 of raising
PB powder 10～16 assorted breezes 0～4
After guaranteeing mixing, wherein the proportion by weight of pulp is:
Point mountain fine ore 45～50 is raised enlightening breeze 32～40
PB powder 10～20 assorted breezes 0～6;
(4) cooperate iron charge and flux and fuel batching
With iron charge admixtion, blast furnace return mine, lime, rhombspar and coke powder install to respectively in the groove of corresponding batching ore deposit,
To proportioning belt, iron charge admixtion, blast furnace are returned mine, the quality proportioning of the flow of the unit time of lime, rhombspar and coke powder is through separately batching disk blanking:
Iron charge admixtion 77.8～78.8 blast furnaces return mine 7～8
Lime 4.8～5.7 rhombspars 6～7 coke powders 2～3;
Guarantee that iron charge admixtion, blast furnace are returned mine in the mixed sintering admixtion, the proportion by weight of lime, rhombspar and coke powder is:
Iron charge admixtion 77.8～78.8 blast furnaces return mine 7～8
Lime 4.8～5.7 rhombspars 6～7 coke powders 2～3
It is wetting raising the enlightening breeze in the sintering admixtion;
(5) mixer batch mixings
The sintered material for preparing is transported in a mixer through belt carries out the mixing operation, in mixer, the wetting compound that begins to spray water apart from 2.5～3.5 meters of discharging point level, to strengthen mixing, amount of water is 0.4～0.5 ton/minute;
(6) rerolling mechanism grain
After a mixer carries out mixing, get into rerolling mechanism grain, the amount of water of rerolling machine is 0.08～0.12 ton/minute;
No. (seven) three times mixers are strengthened granulation
Behind the rerolling machine batch mixing, get into No. three mixers and strengthen granulation, the amount of water of No. three mixers is 0.01～0.05 ton/minute; Behind No. three the mixer batch mixings, the water yield in the sinter mixture is 5.9%-7.9%;
(8) cloth and binder
Sinter mixture behind the mixing granulation is spread on the Dwight-Lloyd sintering machine, and bed depth is 710～725mm behind the cloth, and ultra breast board 10～25mm, binder height are 30～40mm;
(9) igniting and insulation
Ignition temperature control is as the criterion with charge level Fa Lanse, and ignition temperature is 1030 ℃ to 1060 ℃, and the negative pressure of the bellows below the corresponding holding-zone is adjusted to 2.5kPa～3kPa, 450 ℃～550 ℃ of holding temperatures;
(10) down draft sintering
The material travelling speed of sinter machine is 1m～1.2m/min, and the sintering negative pressure is: 11kPa～12kPa;
(11) cooling
The material block sintering that sintering is gone out is transported to and carries out the air blast cooling in the central cooler, and cooled agglomerate temperature is not higher than 120 ℃;
(12) whole grain
Cooled material block sintering is transported to sieves whole grain between screening, tell less than the returning mine of 5mm, greater than 5mm is qualified sinter.
2. sharp mountain fine ore according to claim 1 and limonite are joined the sintering method in ore deposit, it is characterized in that:
(3) iron charge batching
Point mountain fine ore, the proportion by weight of raising interior flow of unit time of enlightening breeze, PB powder and assorted breeze are 90: 77: 26: 7; Proportion by weight after the cooperation is:
The point mountain fine ore 45 wetting enlightening breezes 38.5 of raising
PB powder 13 assorted breezes 3.5
The wetting enlightening breeze of raising has added the water of raising enlightening ore deposit 9% relatively;
Wherein the proportion by weight of pulp is:
Point mountain fine ore 47 is raised enlightening breeze 35
PB powder 14 assorted breezes 4
(4) cooperate iron charge and flux and fuel batching
Iron charge admixtion, blast furnace are returned mine, the quality proportioning of the flow of the unit time of lime, rhombspar and coke powder is 78.3: 7.5: 5.2: 6.5: 2.5; After guaranteeing to mix, iron charge admixtion, blast furnace are returned mine, the proportion by weight of lime, rhombspar and coke powder is:
Iron charge admixtion 78.3 blast furnaces return mine 7.5
Lime 5.2 rhombspars 6.5 coke powders 2.5
The enlightening breeze of raising in the iron charge admixtion is wetting;
(5) mixer batch mixings
In mixer, the wetting compound that begins to spray water apart from 3 meters of discharging point level, amount of water is 0.43 ton/minute;
(6) rerolling mechanism grain
The amount of water of rerolling machine is 0.117 ton/minute;
No. (seven) three times mixers are strengthened granulation
The amount of water of No. three mixers is 0.03 ton/minute;
(8) cloth and binder
Sinter mixture behind the mixing granulation is spread on the Dwight-Lloyd sintering machine, and bed depth is 720mm behind the cloth, and ultra breast board 10mm, binder height are 35mm;
(9) igniting and insulation
The negative pressure of No. 3 bellows of holding-zone is adjusted to 3kPa, 500 ℃ of holding temperatures;
(12) whole grain
Once screening gets into crusher greater than the screen overflow of 50mm and carries out fragmentation, and the spacing between the breaker roll is 50mm; Agglomerate after the fragmentation with once the screening in screen underflow converge; Carry out regrading again, greater than 5mm be qualified sinter, return mine less than the conduct of 5mm.
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| CN103334004B (en) * | 2013-06-30 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Method for producing sinter from Yuanjia village concentrate powder by using large sintering machine |
| CN104313315B (en) * | 2014-10-14 | 2017-06-20 | 首钢总公司 | A kind of pre- whole grain method of sintering deposit for improving central cooler cooling effectiveness |
| CN107304461B (en) * | 2016-04-25 | 2019-04-19 | 中冶长天国际工程有限责任公司 | Strength hybrid technique and its device for sintering production |
| CN110079666A (en) * | 2019-06-10 | 2019-08-02 | 成渝钒钛科技有限公司 | A kind of vanadium titanium sintering Mike's powder substitution PB powder research method |
| CN110629017B (en) * | 2019-10-16 | 2021-04-02 | 广东韶钢松山股份有限公司 | Sintered iron-containing material, sintered composition, sintered ore and method for producing same |
| CN112522508B (en) * | 2020-12-03 | 2022-07-12 | 华北理工大学 | Method for controlling granularity of sintering fuel |
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