CN101921909B - Method for controlling ferrous oxide content in sintering ore - Google Patents
Method for controlling ferrous oxide content in sintering ore Download PDFInfo
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Abstract
The invention provides a method for controlling the ferrous oxide (FeO) content in a sintering ore. In the method, the sintering ore comprises the following raw materials: titanium-containing iron ore powder, fuel, a flux and blast furnace dust; and a value in formula 1 is controlled within 2.8wt%-2.9wt% so as to control the ferrous oxide content in the sintering ore within 7.2wt%-8.2wt%, wherein, the formula 1 is as follows: (FC) mixture=[Wfuel*(1-Afuel-Vfuel-Sfuel-Hfuel)+R(blast furnace dust)*Wnew material*C(blast furnace dust)]/Wmixture*100%. The method of the invention can control the FeO content in the sintering ore accurately and stably to obtain the sintering ore with excellent reducibility and intensity, thus further promoting iron increase and coke reduction during the blast-furnace smelting process, lowering the iron-making cost, reducing the coke powder usage during the sintering process, lowering the solid fuel consumption and saving the cost while realizing recovery and reuse of the blast furnace dust.
Description
Technical field
The present invention relates to the preparation field of sintered ore for iron-smelting, more particularly, relate to a kind of method of controlling ferrous oxide content in the agglomerate through the fixed carbon content in the control raw materials for sintering.
Background technology
Agglomerate is the main raw material that blast furnace ironmaking is produced, and production plays important effect to its quality quality to blast furnace.As a rule; Agglomerate is a kind of porous aggregate that is formed by many mineral sintering; To be compound generate after a plurality of stages such as dry (transpiring moisture), preheating (decomposition and crystallization water and carbonate), fuel combustion (redox reaction and solid state reaction take place), fusing (generating the lower melting point liquid phase) and condensation (iron mineral with cohere crystallization mutually) for it; Wherein, compound is mixed by powdered iron ore, fuel, flux and a certain amount of water.
Iron protoxide (FeO) is the important component of agglomerate, and it is the composite target of reaction sintering temperature and atmosphere.Sintering all shows with the smelting practice: iron protoxide in the agglomerate (FeO) content is high more, and the reductibility of smelting is poor more, and is unfavorable to the blast furnace iron increasing and coke saving; Yet FeO content is low excessively in the agglomerate, and the required shortage of heat of sintering reaction influences sinter strength, and cause sintering process return mine many, yield rate is low.At present, for iron increasing and coke saving, all carry out reducing the method for FeO content in the agglomerate both at home and abroad.Yet,, must take corresponding supporting technology to improve sinter strength simultaneously for fear of the deterioration sinter strength.Thereby, cause these method stepss more, operation is complicated.And many methods can not with the stable content of FeO in the agglomerate be controlled in the suitable scope, this is unfavorable for the stably manufactured of blast-furnace smelting.
Therefore, how controlling the content of FeO in the agglomerate, make it accurately and stablely be in suitable scope, is the key that obtains to have the agglomerate of good reductibility and good intensity.
Summary of the invention
Deficiency to prior art; The object of the present invention is to provide a kind of method of controlling ferrous oxide content in the agglomerate; This method assigns to ferrous oxide content in the agglomerate stably is controlled in the suitable scope through the one-tenth of adjustment sinter mixture, thereby obtains having the agglomerate of good reductibility and good intensity.
The invention provides a kind of method of controlling ferrous oxide content in the agglomerate; The raw material of agglomerate comprises titaniferous powdered iron ore, fuel, flux and blast furnace dust ash; Said method is controlled in the scope of 2.8wt%～2.9wt% through the value with formula 1; Ferrous oxide content in the agglomerate is controlled in the scope of 7.2wt%～8.2wt%, said formula 1 is: (FC)
Compound=[W
Fuel* (1-A
Combustion-V
Combustion-S
Combustion-H
Combustion)+R
The blast furnace dust ash* W
Virgin material* C
The blast furnace dust ash] ÷ W
Compound* 100%, in formula 1, compound comprises virgin material and sinter machine circulating inside material, and virgin material is meant the sinter machine outside with addition of material, and virgin material comprises powdered iron ore, fuel, flux and blast furnace dust ash; (FC)
CompoundRepresent the fixed carbon content in the compound by weight percentage, W
Combustion Material, W
Virgin materialAnd W
CompoundEvery meter charge hoisting by belt conveyer weight representing fuel, virgin material and compound respectively, A
Combustion, V
Combustion, S
CombustionAnd H
CombustionRepresent ash content, volatile matter, sulphur content and the moisture of fuel by weight percentage respectively, R
The blast furnace dust ashFor blast furnace dust ash wet feed accounts for the weight percent of virgin material wet feed, C
The blast furnace dust ashRepresent the fixed carbon content in the blast furnace dust ash by weight percentage.
According to the method for ferrous oxide content in the control agglomerate of the present invention, said sinter machine circulating inside material comprises hot returning ore, cold returning mine and dedusting ash.
According to the method for ferrous oxide content in the control agglomerate of the present invention, said raw material can comprise that also Australian fine ore, domestic higher-grade fine ore and sieve add at least a ferrous material in the powder.
According to the method for ferrous oxide content in the control agglomerate of the present invention, said fuel can be coke powder or hard coal.
According to the method for ferrous oxide content in the control agglomerate of the present invention, the composition of said compound can be virgin material 60%-70%, the cold 25%-35% that returns mine, hot returning ore 3%-4%, dedusting ash 1%-3% by wet proportioning; And the composition of said virgin material can be sefstromite concentrate 45%-55%, Australian fine ore 9%-20%, domestic higher-grade fine ore 9%-20% by wet proportioning; Sieve adds powder 1%-6%, Wingdale 1%-5%, unslaked lime 4%-6%; Active unslaked lime 2%-3%; Slag 1%-2%, blast furnace dust ash 2%-3%, coke powder 4.4%-4.6%.
The present invention provides a kind of method of controlling ferrous oxide content in the agglomerate again; The raw material of agglomerate comprises titaniferous powdered iron ore, fuel, flux and blast furnace dust ash; Said method is controlled in the scope of 2.8wt%～2.9wt% through the value with formula 2; Ferrous oxide content in the agglomerate is controlled in the scope of 7.2wt%～8.2wt%, said formula 2 is: (FC)
Virgin material=[W
Fuel* (1-A
Combustion-V
Combustion-S
Combustion-H
Combustion)+R
The blast furnace dust ash* W
Virgin material* C
The blast furnace dust ash] ÷ W
Virgin material* 100%, in formula 2, virgin material is meant the sinter machine outside with addition of material, and virgin material comprises powdered iron ore, fuel, flux and blast furnace dust ash; (FC)
Virgin materialRepresent the fixed carbon content in the virgin material by weight percentage, W
FuelAnd W
Virgin materialEvery meter charge hoisting by belt conveyer weight representing fuel and virgin material respectively, A
Combustion, V
Combustion, S
CombustionAnd H
CombustionRepresent ash content, volatile matter, sulphur content and the moisture of fuel by weight percentage respectively, R
The blast furnace dust ashFor blast furnace dust ash wet feed accounts for the weight percent of virgin material wet feed, C
The blast furnace dust ashRepresent the fixed carbon content in the blast furnace dust ash by weight percentage.
Compare with traditional technology, the beneficial effect of method of the present invention is following:
(1) through the fixed carbon content in the control raw materials for sintering; Can the content of iron protoxide in the agglomerate (FeO) be controlled at accurately and stably in the required interval; Thereby the agglomerate that acquisition has good reductibility and intensity; And improved the index of stability of FeO content in the agglomerate, and then promoted the iron increasing and coke saving of blast-furnace smelting, reduced ironmaking cost.
(2) adopt carbonaceous blast furnace dust ash instead of part coke powder, when realizing that the blast furnace dust ash is recycled, reduced the consumption of coke powder in the sintering process, reduced solid burnup, practiced thrift the sintering cost.
Embodiment
Sintering mine FeO content is one of crucial quality index in ironmaking operation and the sintering circuit, also is to judge the intensity of agglomerate and the important indicator of reducing property quality.(, SiO identical under certain condition like basicity
2Content is close), FeO content and its intensity are closely related in the agglomerate.In addition, FeO content also has very big influence to the indirect reduction last, the middle part that occurs in blast furnace in the agglomerate, i.e. iron increasing and coke saving to blast furnace have very big influence.That is to say that the FeO content of rationally controlling in the agglomerate not only can be guaranteed the intensity of agglomerate, and can realize the iron increasing and coke saving of blast furnace.According to contriver's experience, the every minimizing 1% of sintering mine FeO content, blast furnace coke ratio can reduce about 1.5%.For easy reduction, the suitable high-strength sintered ore deposit of FeO content are provided to blast-furnace smelting, must detect FeO content in real time in the production.
Variation along with the charge composition of the blast furnace that uses ilmenite; The ratio of acidic pellet ore reaches about 25%; Sinter basicity is brought up to about 2.2, and basicity improves back agglomerate mineral composition and very big variation has taken place mineral phase structure, and the bonding of agglomerate is main with the high Well-recovered calcium ferrite of intensity mainly mutually; But the condition that forms calcium ferrite is low temperature and hyperoxia position, and temperature condition is 1200～1280 ℃.FeO content is high more in the agglomerate, and then sintering temperature is high more, and reducing atmosphere is strong more, and the calcium ferrite growing amount is just few more, and vice versa.Yet organization of production requires the thick bed of material operation in hyperoxia position, produces the agglomerate of low FeO content.The change of essence has taken place in the sintering process system in recent years, and concentrate quality improves, and basicity improves, and the rich ore proportioning increases, and the bed of material improves, and the unslaked lime consumption increases or the like.Production practice and experimental study prove: at present under the condition FeO optimum controling range of vanadium titanium agglomerate be 7.2wt%～8.2wt% (preferably; The FeO content of vanadium titanium agglomerate is 7.7wt%); The product, the quality that exceed this interval agglomerate will descend; And deterioration blast furnace that can be the to a certain degree quality and the efficient of producing, therefore should be as far as possible in SINTERING PRODUCTION technology the FeO of agglomerate be controlled in the scope of 7.2wt%～8.2wt%.When the content of iron protoxide in the agglomerate is lower than 7.2wt%, can cause sinter strength to reduce, and cause sintering process return mine many, yield rate is low.When the content of iron protoxide in the agglomerate was higher than 8.2wt%, the reductibility of agglomerate when blast-furnace smelting reduces, and be unfavorable to the blast furnace iron increasing and coke saving, causes ironmaking cost to increase.
Because it is numerous to influence the factor of FeO content in the agglomerate, so the FeO content that in actual production, will accomplish to control accurately and stably in the agglomerate is relatively more difficult.Yet; The contriver is through study and put into practice repeatedly; Among numerous factors of discovery FeO content in influencing agglomerate; The solid burnup of raw materials for sintering is the principal element that influences FeO content in the agglomerate, and changes under the little situation in material structure, mixing granulation parameter, operating duty, the chemical Composition Control of same sinter machine, the almost proportional example relation of the solid burnup of FeO content and raw materials for sintering in the agglomerate.Therefore; The contriver proposes to realize the control to the ferrous oxide content in the agglomerate through the solid-fuelled content of controlling accurately and stably in the raw materials for sintering, thereby under guaranteeing the prerequisite of sinter strength, realizes iron increasing and coke saving and reduce the effect of the solid burnup in the sintering process.Specifically, be controlled at through value in the scope of 2.8wt%～2.9wt% (preferably, being 2.85wt%), ferrous oxide content in the agglomerate be controlled in the scope of 7.2wt%～8.2wt% formula 1.
Formula 1: (FC)
Compound=[W
Fuel* (1-A
Combustion-V
Combustion-S
Combustion-H
Combustion)+R
The blast furnace dust ash* W
Virgin material* C
State of Blast Furnace The dirt ash] ÷ W
Compound* 100%.
In formula 1, virgin material is meant the sinter machine outside with addition of material, comprises powdered iron ore, fuel, flux and blast furnace dust ash; Compound comprises virgin material, also can comprise the circulating inside material, the circulating inside material comprise coldly return mine, hot returning ore and dedusting ash; (FC)
CompoundRepresent the fixed carbon content in the compound by weight percentage, W
Fuel, W
Virgin materialAnd W
CompoundEvery meter charge hoisting by belt conveyer weight representing fuel, virgin material and compound respectively, A
Combustion, V
Combustion, S
CombustionAnd H
CombustionRepresent ash content, volatile matter, sulphur content and the moisture of fuel by weight percentage respectively, R
The blast furnace dust ashBe the wet proportioning (that is, blast furnace dust ash wet feed accounts for the weight percent of virgin material wet feed) of blast furnace dust ash, C
The blast furnace dust ashRepresent the fixed carbon content in the blast furnace dust ash by weight percentage.For other material, the wet proportioning of said material is meant the percent value of the wet feed weight of this material divided by the virgin material wet weight.
In general, main ferrous material is about 80% divided by the weight percent sum of virgin material wet weight in the virgin material, and because of the basicity and the iron protoxide of adjustment agglomerate, Wingdale and coke powder need adjust sometimes.Usually, prepare agglomerate through following steps, said step comprises: batching, mixing, cloth, igniting and sintering, broken, the hot screening of heat, cooling, screening.Hot returning ore is meant accomplishes the agglomerating compound through overheated fragmentation and the remaining particle diameter material not up to standard of heat screening.Cold returning mine is meant that completion agglomerating compound is at remaining particle diameter material not up to standard after overcooling, screening.Dedusting ash is meant in whole sintering process, collected dust.
Here, at least a titaniferous iron ore of powdered iron ore in comprising ilmenite, sefstromite, can comprise that also Australian fine ore, domestic higher-grade fine ore and sieve add ferrous materials such as powder.Fuel can be coke powder or hard coal.As well known to those skilled in the art, in sintering process, coke powder and hard coal all can be used as fuel, and they can the phase trans-substitution.Flux can comprise the steel-making slag of Wingdale, unslaked lime, active unslaked lime, steelworks etc.
Specifically, the composition of said compound can be virgin material 60%-70%, the cold 25%-35% that returns mine, hot returning ore 3%-4%, dedusting ash 1%-3% by wet proportioning; And the composition of said virgin material can be sefstromite concentrate 45%-55%, Australian fine ore 9%-20%, domestic higher-grade fine ore 9%-20% by wet proportioning; Sieve adds powder 1%-6%, Wingdale 1%-5%, unslaked lime 4%-6%; Active unslaked lime 2%-3%; Slag 1%-2%, blast furnace dust ash 2%-3%, coke powder 4.4%-4.6%.Here, sieve adds powder and is meant the screen underflow after blast furnace sieves with lump ore.
Hereinafter, will combine exemplary embodiment that the present invention is described.Here, need to prove, in order to verify circulation ratio of the present invention and estimate iron protoxide (FeO) index of stability of agglomerate that comparative examples and embodiment 1 to 6 have all comprised many groups of experiments.
The composition of used various materials is seen table 1 among comparative examples and the embodiment 1 to 6.
The composition of each material in table 1 compound
Comparative examples and embodiment 1-6 adopt following steps to implement:
1, virgin material adds proportioning belt to through disk feeder, belted electronic balance, the screw feeder scale (unslaked lime and active unslaked lime feed) of proportioning room; Cold returning mine added the compound belt to through disk feeder, belted electronic balance; Hot returning ore adds the compound belt to through disk feeder, and dedusting ash is added the compound belt to through screw feeder.Wherein, virgin material and cold returning mine can be through setting the purpose that material loading amount and proportioning reach automatic blending on the microcomputer, and hot returning ore and dedusting ash are adjusted feeding coal through adjusting disc rotation speed, revolution speed of screw;
2, virgin material is controlled at 38～42kg/m (here; Units/m representes every meter charge hoisting by belt conveyer kilogram of sinter machine number); Cold returning mine is controlled at 17～22kg/m, and hot returning ore is controlled at 1.5～3.0kg/m, and dedusting ash is controlled at 1～1.5kg/m; The wet proportioning of blast furnace dust ash is controlled at 2～3%, and the wet proportioning of coke powder is controlled at 4.4～4.6%; Each component ratio in virgin material and the compound (wet proportioning) is seen table 2, table 3;
Each component ratio (weight percent) in table 2 virgin material
Each component ratio (weight percent) in table 3 compound
| Virgin material % | The cold % that returns mine | Hot returning ore % | Dedusting ash % |
| 60-70 | 25-35 | 3-4 | 1-3 |
3, all materials get into primary mixer after adding the compound belt to, add water-wet and mixing, and one time moisture is controlled at 7.1～7.4%;
4, the mixing material gets into second drum mixer through travelling belt, makes ball, and secondary compound moisture controlled is 7.1～7.3%, and discharging is given trolley to shuttle-type, and walking back and forth is dumped in the groove of compound ore deposit;
5, compound is expected sinter machine (173.6m through circle roller feeding machine, nine roller cloth
2Sintering area) on the chassis, bed of material control 660～700mm;
6, the igniting at 1# bellows place, the sinter machine speed control is carried out down draft sintering at 1.5～1.7m/min, and sintering end point is controlled at the penult bellows, and terminal temperature is controlled at 280～340 ℃ (sinter bed is grilled thoroughly);
7, sintering process unloads from tail after the penult bellows are accomplished, and is broken for＜agglomerate of 150mm by single roll crusher, once sieve through heat sieve (sieve aperture 5mm), and the hot returning ore of＜5mm gets into hot returning ore ore deposit groove,＞5mm agglomerate entering 145m
2Cool off in the ring type air blast cooler;
8, cooling is accomplished the back agglomerate and is got into cold sieve (regrading) screening, can sieve whole to obtain >=5mm finished product agglomerate, the sintering pallet grate-layer material of 5-10mm,＜the cold of 5mm return mine; Through belt transportation, finished product agglomerate to blast furnace agglomerate ore deposit groove, grate-layer material to grate-layer material ore deposit groove, cold returning mine to the cold ore deposit groove of returning mine.
Comparative examples
Sintering machine material structure and operation as follows, virgin material 38kg/m, the cold 16kg/m that returns mine, hot returning ore is controlled at 2.1kg/m, dedusting ash 1.1kg/m, the blast furnace dust ash proportioning 2% that wets, the coke powder proportioning 4.24% that wets, compound fixed carbon calculated value 2.79%; Sinter machine speed 1.6m/min, bed thickness 668mm, 310 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.31%; The sintering mine FeO index of stability is 69.34%, barrate strength 62.99%, agglomerate solid burnup 53.08%.
The sintering mine FeO index of stability is meant the ratio of weight with the weight of all agglomerate of the agglomerate of FeO content in 7.5 ± 0.5% scopes.The agglomerate solid burnup is meant the ratio of producing the used coke powder of agglomerate or anthracitic kilogram number and the tonnage of the agglomerate that obtains.Here; The measuring method of barrate strength is: the agglomerate 15kg that gets 10mm to 40mm grade goes into rotary drum; Rotary drum begins rotation work with the speed of 25r/min, and rotating 200, to change the back out of service, sieves out＞screen overflow of 6.3mm; Calculating screen overflow shared mass percent in going into the agglomerate of rotary drum, then is the barrate strength of agglomerate.
Embodiment 1
Sintering machine material structure and operation as follows, virgin material 38.2kg/m, the cold 17kg/m that returns mine, hot returning ore is controlled at 1.8kg/m, dedusting ash 1.3kg/m, the blast furnace dust ash proportioning 2% that wets, the coke powder proportioning 4.4% that wets, compound fixed carbon calculated value 2.86%; Sinter machine speed 1.6m/min, bed thickness 668mm, 310 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.51%; Compare with comparative examples, the sintering mine FeO index of stability rises 1.76%, and barrate strength rises 2.01%, agglomerate solid burnup decline 1.54kg.
Embodiment 2
Sintering machine material structure and operation as follows, virgin material 38.7kg/m, the cold 18.2kg/m that returns mine, hot returning ore is controlled at 2.1kg/m, dedusting ash 1.2kg/m, the blast furnace dust ash proportioning 2% that wets, the coke powder proportioning 4.5% that wets, compound fixed carbon calculated value 2.87%; Sinter machine speed 1.52m/min, bed thickness 695mm, 316 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.54%; Compare with comparative examples, the sintering mine FeO index of stability rises 7.61%, and barrate strength rises 2.85%, agglomerate solid burnup decline 5.42kg.
Embodiment 3
Sintering machine material structure and operation as follows, virgin material 39.3kg/m, the cold 21.5kg/m that returns mine, hot returning ore is controlled at 2.3kg/m, dedusting ash 1.2kg/m, the blast furnace dust ash proportioning 3% that wets, the coke powder proportioning 4.58% that wets, compound fixed carbon calculated value 2.85%; Sinter machine speed 1.61m/min, bed thickness 693mm, 321 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.56%; Compare with comparative examples, the sintering mine FeO index of stability rises 9.71%, and barrate strength rises 2.97%, agglomerate solid burnup decline 7.97kg.
Embodiment 4
Sintering machine material structure and operation as follows, virgin material 40.3kg/m, the cold 22kg/m that returns mine, hot returning ore is controlled at 2.5kg/m, dedusting ash 1.3kg/m, the blast furnace dust ash proportioning 3% that wets, the coke powder proportioning 4.59% that wets, compound fixed carbon calculated value 2.87%; Sinter machine speed 1.67m/min, bed thickness 687mm, 334 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.62%; Compare with comparative examples, the sintering mine FeO index of stability rises 7.72%, and barrate strength rises 2.88%, agglomerate solid burnup decline 8.35kg.
Embodiment 5
Sintering machine material structure and operation as follows, virgin material 41kg/m, the cold 21.4kg/m that returns mine, hot returning ore is controlled at 2.6kg/m, dedusting ash 1.4kg/m, the blast furnace dust ash proportioning 3% that wets, the coke powder proportioning 4.56% that wets, compound fixed carbon calculated value 2.88%; Sinter machine speed 1.72m/min, bed thickness 680mm, 320 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.75%; Compare with comparative examples, the sintering mine FeO index of stability rises 5.31%, and barrate strength rises 3.26%, agglomerate solid burnup decline 8.16kg.
Embodiment 6
Sintering machine material structure and operation as follows, virgin material 41.5kg/m, the cold 22kg/m that returns mine, hot returning ore is controlled at 2.5kg/m, dedusting ash 1.5kg/m, the blast furnace dust ash proportioning 3% that wets, the coke powder proportioning 4.58% that wets, compound fixed carbon calculated value 2.89%; Sinter machine speed 1.72m/min, bed thickness 675mm, 318 ℃ of sintering end points.
The result shows, sintering mine FeO: 7.88%; Compare with comparative examples, the sintering mine FeO index of stability rises 5.34%, and barrate strength rises 3.33%, agglomerate solid burnup decline 8.21kg.
Table 4 shows the batching parameter and the result of the sintering process of comparative examples and embodiment 1-6.Can find out by table 4; Compare with comparative examples; According to the method for the invention compound fixed carbon calculated value is controlled in 2.8wt%～2.9wt% scope, thereby has improved the index of stability of FeO content in the agglomerate, and improved barrate strength and reduced solid burnup simultaneously.
The batching parameter and the result of the sintering process of table 4 comparative examples and embodiment 1-6
The main operating parameters of the sintering process of table 5 comparative examples and embodiment 1-6
In addition, in the above embodiment of the present invention, for make full use of sintering process residual circulating inside material, reach the purpose of resource recycling, the circulating inside material of sintering process is formed compound with virgin material is used for producing agglomerate.Yet; Those skilled in the art should understand; Since cold return mine with hot returning ore in the scope that will control in institute basically of the content of iron protoxide (for example, in the 7.2wt%～8.2wt%), and dedusting ash composition composition and virgin material become to be grouped into approaching; And the add-on of dedusting ash is less, also can realize the object of the invention so only use virgin material to produce agglomerate.When only using virgin material to produce agglomerate, formula 1 will become formula 2, that is, and and (FC)
Virgin material=[W
Fuel* (1-A
Combustion-V
Combustion-S
Combustion-H
Combustion)+R
The blast furnace dust ash* W
Virgin material* C
The blast furnace dust ash] ÷ W
Virgin material* 100%.
In sum; The content that can control iron protoxide in the agglomerate (FeO) through the fixed carbon content in the control raw materials for sintering of method of the present invention; Thereby the agglomerate that acquisition has good reductibility and intensity; And improved the index of stability of FeO content in the agglomerate, and then promoted the iron increasing and coke saving of blast-furnace smelting, reduced ironmaking cost; And can when realize that the blast furnace dust ash is recycled, reduce the consumption of coke powder in the sintering process, thereby reduce solid burnup, practiced thrift the sintering cost.
Although combined exemplary embodiment to describe in detail according to the method for the invention, it should be appreciated by those skilled in the art that in not breaking away from the spirit and scope that limits claim, can make the present invention and revising and change.
Claims (6)
1. method of controlling ferrous oxide content in the agglomerate; The raw material of agglomerate comprises titaniferous powdered iron ore, fuel, flux and blast furnace dust ash; Said method is controlled in the scope of 2.8wt%～2.9wt% through the value with formula 1; Ferrous oxide content in the agglomerate is controlled in the scope of 7.2wt%～8.2wt%, said formula 1 is:
(FC)
Compound=[W
Fuel* (1-A
Combustion-V
Combustion-S
Combustion-H
Combustion)+R
The blast furnace dust ash* W
Virgin material* C
The blast furnace dust ash] ÷ W
Compound* 100%,
In formula 1, compound comprises virgin material and sinter machine circulating inside material, and virgin material is meant the sinter machine outside with addition of material, and virgin material comprises powdered iron ore, fuel, flux and blast furnace dust ash; (FC)
CompoundRepresent the fixed carbon content in the compound by weight percentage, W
Fuel, W
Virgin materialAnd W
CompoundEvery meter charge hoisting by belt conveyer weight representing fuel, virgin material and compound respectively, A
Combustion, V
Combustion, S
CombustionAnd H
CombustionRepresent ash content, volatile matter, sulphur content and the moisture of fuel by weight percentage respectively, R
The blast furnace dust ashFor blast furnace dust ash wet feed accounts for the weight percent of virgin material wet feed, C
The blast furnace dust ashRepresent the fixed carbon content in the blast furnace dust ash by weight percentage.
2. the method for ferrous oxide content is characterized in that in the control agglomerate as claimed in claim 1, and said sinter machine circulating inside material comprises hot returning ore, cold returning mine and dedusting ash.
3. the method for ferrous oxide content in the control agglomerate as claimed in claim 1; It is characterized in that; Said raw material comprises that also Australian fine ore, domestic higher-grade fine ore and sieve add at least a ferrous material in the powder, and wherein, said sieve adds powder and is meant the screen underflow after blast furnace sieves with lump ore.
4. the method for ferrous oxide content is characterized in that in the control agglomerate as claimed in claim 1, and said fuel is coke powder or hard coal.
5. like the method for ferrous oxide content in any described control agglomerate in the claim 1 to 4; It is characterized in that; Said sinter machine circulating inside material comprises hot returning ore, cold returning mine and dedusting ash, and the weight percent composition of said compound is counted by wet proportioning: virgin material 60%-70%, the cold 25%-35% that returns mine; Hot returning ore 3%-4%, dedusting ash 1%-3%; And the weight percent of said virgin material composition is counted by wet proportioning: sefstromite concentrate 45%-55%, Australian fine ore 9%-20%, domestic higher-grade fine ore 9%-20%; Sieve adds powder 1%-6%, Wingdale 1%-5%, unslaked lime 4%-6%; Active unslaked lime 2%-3%, slag 1%-2%, blast furnace dust ash 2%-3%; Coke powder 4.4%-4.6%, wherein, said sieve adds powder and is meant the screen underflow after blast furnace sieves with lump ore.
6. method of controlling ferrous oxide content in the agglomerate; The raw material of agglomerate comprises titaniferous powdered iron ore, fuel, flux and blast furnace dust ash; Said method is controlled in the scope of 2.8wt%～2.9wt% through the value with formula 2; Ferrous oxide content in the agglomerate is controlled in the scope of 7.2wt%～8.2wt%, said formula 2 is:
(FC)
Virgin material=[W
Fuel* (1-A
Combustion-V
Combustion-S
Combustion-H
Combustion)+R
The blast furnace dust ash* W
Virgin material* C
The blast furnace dust ash] ÷ W
Virgin material* 100%,
In formula 2, virgin material is meant the sinter machine outside with addition of material, and virgin material comprises powdered iron ore, fuel, flux and blast furnace dust ash; (FC) virgin material is represented the fixed carbon content in the virgin material by weight percentage, W
FuelAnd W
Virgin materialEvery meter charge hoisting by belt conveyer weight representing fuel and virgin material respectively, A
Combustion, V
Combustion, S
CombustionAnd H
CombustionRepresent ash content, volatile matter, sulphur content and the moisture of fuel by weight percentage respectively, R
The blast furnace dust ashFor blast furnace dust ash wet feed accounts for the weight percent of virgin material wet feed, C
The blast furnace dust ashRepresent the fixed carbon content in the blast furnace dust ash by weight percentage.
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