CN108070713A - A kind of iron ore sintering method using calcined magnesite ball - Google Patents

A kind of iron ore sintering method using calcined magnesite ball Download PDF

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CN108070713A
CN108070713A CN201610990263.0A CN201610990263A CN108070713A CN 108070713 A CN108070713 A CN 108070713A CN 201610990263 A CN201610990263 A CN 201610990263A CN 108070713 A CN108070713 A CN 108070713A
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iron ore
calcined magnesite
sintering
magnesite ball
content
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CN108070713B (en
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李建
毛晓明
熊林
沈红标
彭新
齐伟
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16Sintering; Agglomerating
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/008Composition or distribution of the charge

Abstract

The invention discloses a kind of iron ore sintering methods using calcined magnesite ball, mainly in iron ore sintering technique, by calcined magnesite ball and Iron Ore Powder, return mine, coke powder, flux configure in proportion, then plus water mixing, granulation, cloth, igniting, sintering, cooling, broken, obtain sinter finished product.Dolomite dust is substituted by calcined magnesite ball, so as to improve sintering mineralization rate, rational mineral composition and mineral phase structure are obtained, this method both can guarantee requirement of the blast furnace process to sinter chemical composition MgO, sintering process can not be deteriorated again, had important practical significance.

Description

A kind of iron ore sintering method using calcined magnesite ball
Technical field
The present invention relates in terms of iron ore sintering, and in particular to a kind of iron ore sintering method using calcined magnesite ball.
Background technology
It is the most widely used iron-bearing material agglomeration method of domestic and international iron and steel enterprise to be sintered (down draft sintering).Sintering process can It is summarised as:Sinter mixture (iron-bearing material, fuel, flux and return mine) is equipped with suitable moisture, after mixing and granulation Be taped against on the trolley of sintering machine, after sintering feed surface ignition, under lower part bellows forced draft effect, bed of material fuel from upper and A series of physical, chemical change occur under high temperature action, is finally consolidated into sinter for lower burning simultaneously heat release, mixture.
As a kind of main blast furnace ironmaking raw material, sinter also needs to meet wanting for chemical composition in addition to intensity, granularity are qualified It asks, mainly including Iron grade, dual alkalinity R2(CaO/SiO2)、MgO、Al2O3, P, S, Zn, Pb etc., wherein Al2O3、P、S、Zn、 This 5 kinds of Pb is more low better, and Iron grade, dual alkalinity R2(CaO/SiO2), MgO this 3 kinds of need are maintained in suitable scope.It burns Tying common flux includes lime stone, dolomite, serpentine and the silica sand of powdery (0~3mm of granularity).Wherein lime stone high temperature is forged CaO after burning is mainly provided, CaO and MgO are mainly provided after dolomite high-temperature calcination, serpentine mainly provides MgO and SiO2, silica sand It is main that SiO is provided2.With the popularization of Burden Preparation For Ironmaking policy, production high iron low silicon agglomerate is increasingly becoming common recognition, in addition in recent years Iron ore resource deterioration gangue increases, therefore in sintering process, seldom adds in serpentine, the siliceous flux of silica sand class, therefore white Marble often becomes the most important flux containing magnesium of agglomeration for iron mine.But dolomite is improving the same of sinter low-temperature reduction disintegration energy When, many adverse effects can be brought, increase of reduction, fuel consumption including sintering output etc..
Sinter addition flux containing magnesium is to meet the needs of blast furnace slag making, usual blast furnace slag dual alkalinity R2(CaO/ SiO2) in the range of 1.10~1.25, Al2O3Under the conditions of content 14~18%, between content of MgO need to maintain 4-8%, to ensure The direct motion of the mobility and smelting process of clinker.
At present, related patents and the known technology document situation for introducing the flux containing magnesium are as follows:
Patent CN 100465306C are described " improving sinter of BF Slag Viscosity and preparation method thereof ", main to solve Certainly high Al after iron ore deterioration2O3The problem of being enriched with and blast-furnace slag mobility caused to be deteriorated.Patent right requirement core is to pass On the basis of system sintering, dolomite and light-magnesite powder collocation are used, increase the content of MgO of sinter ore deposit, it can be in 1.5- It is adjusted in the range of 4.0%, this measure can effectively reduce the viscosity of blast-furnace slag, improve the mobility of blast-furnace slag.Wherein it is sintered The light-burning magnesium powder fine size 0-3mm contents of middle addition are more than 90%, and 80-95%, burn out rate 1.5-4.5% are up to containing magnesium.With The calcined magnesite ball that the present invention uses is different in granularity, ingredient, property, purpose.
Patent CN 104531923A describe " a kind of blast furnace process raw material and blast furnace smelting method ", provide a kind of high The low magnesium blast furnace process raw material of aluminium includes the low magnesium sinter of high alumina, pellet and rawore composition, these furnace charges are not with addition of containing magnesium Ore and the method that the low high aluminum smelting technology of magnesium of high alumina is carried out using the furnace charge.Claims of the patent focus on blast furnace Operating method describes ambiguous in terms of raw materials for metallurgy.As repeatedly emphasized blast furnace process furnace charge not with addition of containing magnesium in patent original text Ore, but in table 1, the only 0.06-0.55% containing MgO in high grade iron concentrate, but magnesium is contained by the pelletizing that iron ore concentrate roasting is made For 1.22-2.75%, if not with addition of magnesium-containing ore, MgO comes wherefrom in pelletizing
Patent CN101906533 is described " a kind of low-silicon magnesium-containing pellets and its production method ", and the original intention of invention is to solve Normal sintering ore deposit content of magnesia is excessively high, it is very unfavorable to Sintering Operation Index the defects of, therefore, by being added into pelletizing containing magnesium Flux, it is ensured that in blast furnace process, the content of magnesia in slag.The flux containing magnesium of 1-4% with iron ore concentrate, binding agent is mixed and is matched somebody with somebody Material, pelletizing, drying, preheating, roasting obtain intensity and the excellent magnesium-containing pellets of metallurgical performance, this measure can solve well Dolomite class conventional solvent is to the adverse effect of Sintering Operation Index.But problem is left for pelletizing production, in general, addition is containing magnesium After flux, if the roasting system maintained like, because of the addition of high-melting-point magnesium-containing mineral, pellet strength will reduce, if it is desired to protecting Same intensity is held, then needs to properly increase the calcination temperature of pelletizing.
Patent CN103131851 describes " a kind of rich magnesium bentonite adhesive of pelletizing ", and Main is by 20-30% Magnesite mountain flour is first mixed into bentonite, and thinking is similar with previous patent CN101906533, there is also similar problem, in addition There is another problem in that the additive amount of MgO is limited by bentonite ore ratio, it is impossible to it is too high, it otherwise will bring smelting process into In unwanted aluminosilicate, and then influence pelletizing Iron grade.
Patent CN103898316 introduces " a kind of magnesia composite bentonite of pelletizing ", and Main is by the light of 20-30% It burns magnesite powder to be first mixed into bentonite, and previous patent ratio, content of MgO slightly improves in bentonite, but equally exists swelling The problem of impurity that brings of used in amounts increasing of soil increases, with the patent of front two there are it is similary the problem of, i.e., need to improve roasting Temperature just can guarantee that the compression strength of finished pellet does not decline.
Patent CN94110210.6 introduces " steel-making matches somebody with somebody magnesium slag former with magnesia unslacked pelletizing ", a kind of steelmaking slagging magnesia unslacked Pelletizing mainly strengthens to match somebody with somebody in magnesium slagging process using in pneumatic steelmaking.It is characterized in that using content of MgO as more than 90% it is light-burned Magnesium powder is raw material, using water as bonding agent, the weight ratio dispensing for being 100: 5~10 by the proportioning of the two, through mixing, being molded, drying Magnesia unslacked pelletizing is made.Cost can be substantially reduced with magnesium slag making for making steel, improves furnace life, increases output of steel, economic benefit is shown It writes.The patent is mainly to substitute original high-quality light-burned MAG block of bulk with cheap calcined magnesite ball, and liquid slag is formed after fusing and is protected Protect converter lining.This programme is using calcined magnesite ball high-melting-point and containing the high characteristic of magnesium, it is made to be played in Ore Sintering Process Improve the effect of hot gas permeability.Meanwhile calcined magnesite ball carbonate content is low, in replacement dolomite after magnesium carbonate, can reduce burning Knot process CO2Discharge.And in calcined magnesite ball MgO inside blast furnace as normal sintering ore deposit, may participate in blast furnace slag making, will not Influence the performance of blast-furnace slag.Calcined magnesite ball granularity in this programme, purposes, using process and action principle with CN94110210.6 is different.
Xia Shiyuan, the Shen love people etc. describes " sintering of Ji steel is with addition of the experimental study and application of compound light-burning magnesium powder " (Jiangxi Metallurgy, 2013, Vol.33, No.6, P1-5), the compound light-burning magnesium powder of experimental study substitutes light dolomite powder to sintering production The influence of index, powdery used (0~325 mesh of granularity accounts for more than 90%) light-burning magnesium powder content of MgO are 90.74%, sintered cup Result of the test shows using after compound light-burning magnesium powder, sintering usage factor, vertical sintering speed, yield rate, tumbler index, low Warm reduction degradation index all makes moderate progress, but the solid burnup being sintered simultaneously also increases 1.7kg/t, and in addition basicity also increases 0.04 and using compound light-burning magnesium powder while sinter part yield and quality index is improved, add fuel consumption and discharge. The reason for limiting the Technique Popularizing includes at 2 points:First, high-purity soft burning magnesium dust (containing MgO more than 90%) price is high;It is second is that ultra-fine Light-burning magnesium powder transportational process will bring the pollutions such as airborne dust.In the technology, the activity of ultra-fine light-burning magnesium powder is high, is easy in sintering process CaO and SiO2Form diopside (CaOMgO2SiO2, 1391 DEG C of fusing point), monticellite (because ingredient is different, fusing point 1357-1890 DEG C) etc..This programme, mainly using its high-melting-point, in sintering process, is formed using block calcined magnesite ball agglomerate Supporting role improves hot gas permeability, to improve sintering velocity, increases yield.
Therefore, as can by using new flux containing magnesium, change its addition manner, both can guarantee blast furnace process to sinter The requirement of chemical composition MgO, and sintering process can not be deteriorated, undoubtedly have important practical significance.
The content of the invention
It is an object of the present invention to provide a kind of iron ore sintering methods using calcined magnesite ball, are substituted by calcined magnesite ball Dolomite dust so as to improve sintering mineralization rate, obtains rational mineral composition and mineral phase structure, mainly solves in the prior art Cost problem.
Technical solution is used by present patent application:
In iron ore sintering technique, by calcined magnesite ball and Iron Ore Powder, return mine, coke powder, flux configure in proportion, Ran Houjia It is water mixing, granulation, cloth, igniting, sintering, cooling, broken, sinter finished product is obtained, concrete operation step is as follows:
1) following component is made into dry material by weight percentage:Calcined magnesite ball 0.5~3.5%, Iron Ore Powder 60~65%, It returns mine 20~25%, coke powder 3.5~4.5%, flux 5~11%;The water for adding dry material total weight 7.0~8.5% carries out It is uniformly mixed;
2) mixed material is put into mixer, carries out mixing granulation, 5~8min of Granulation time;
3) mixture after granulation is uniformly distributed into sintered cup;
4) to light a fire to mixture in sintered cup, firing temperature is 1050 DEG C ± 50 DEG C, the duration of ignition 1.5~ 2.5min, 7~8kPa of igniting negative pressure;
5) after the completion of lighting a fire, mixing coke powder in the bed of material and be ignited, adjust negative pressure to 14~16kPa, mixture starts to be sintered, After sintering, continue to be cooled down in sintered cup;
6) after sinter after cooling is crushed, sinter finished product is obtained.
Preferably,
In step 1),
The Iron Ore Powder is the iron ore blending ore of one or more of magnetic iron ore, bloodstone, limonite;
The flux is one or more of lime stone, quick lime;It is preferred that the flux is quick lime and lime stone Mixture;Further preferably, the flux is quick lime and lime stone using parts by weight as 2~5:The mixture of 3~6 compositions;
The granularity of the Iron Ore Powder is in below 8mm, below the granularity 5mm to return mine, the grain of the coke powder Spend 0~3mm, 0~3mm of flux granularity;
The ingredient of the calcined magnesite ball includes by weight percentage:Content of MgO 60~85%, CaO content< 2.5%, SiO2Content<3.0%, Al2O3Content<0.3%;It is furthermore preferred that the ingredient of the calcined magnesite ball is with weight percent Calculating includes:Content of MgO 60~70%, CaO content 1.5~2.3%, SiO2Content 2.4~3.0%, Al2O3Content 0~ 0.015%;
The granularity of the calcined magnesite ball is 5~20mm, and compression strength is more than 1000N/, and shape is block or spherical.
In step 6), described is broken for being crushed using single roll crusher.
In embodiments of the present invention, MgO equivalent in the raw material dolomite dust (0~3mm of granularity) during ordinary sinter is produced The proportioning of calcined magnesite ball is converted to, CaO is provided by agstone or quick lime in dolomite, is carried out according to the program of sintered material It calculates, on the premise of chemical composition is constant, obtains iron ore, lime stone, quick lime, calcined magnesite ball, coke powder, matching somebody with somebody of returning mine Than.
In an embodiment of the invention, calcined magnesite ball can be calcined by magnesite and directly obtain block calcined magnesite ball, also may be used By the light-calcined magnesite powder after calcining calcined magnesite ball is obtained by agglomeration process such as pelletizing or briquettings.
In the sinter finished product, the content of MgO is 1.0~3.1%, the dual alkalinity R of sinter2(CaO/SiO2) For 1.75~2.0.
Further, since the fusing point of MgO is up to 2800 DEG C, and about 1400 DEG C of Ore Sintering Process maximum temperature, therefore it is light-burned For magnesium ball in sintering process in addition to the ultra-thin sintering liquid phase of surface penetration, inside is solid-state.Maintain solid calcined magnesite ball will It is to the benefit that sintering process is brought, the temperature highest of combustion zone in sintering process, and forms Partial Liquid Phase, liquid phase exists It is flowed under the action of air-flow, sintering process air resistance is caused to increase, solid calcined magnesite ball can play support bed structure, change The effect of kind gas permeability, is shown in Fig. 2.Due to the presence of calcined magnesite ball, air-flow can have enough gaps to flow to bottom always, bring Oxygen can more smoothly with fuel reaction, the raising of gas permeability be conducive to improve fuel burning velocity and sintering process it is vertical Sintering velocity.
Advantageous effect
Beneficial effects of the present invention include:Optimize sintering production technical indicator, especially improve sintering usage factor, improve Yield is this means that the reduction of production cost.In addition, the content of magnesia of calcined magnesite ball is about 3 times of dolomite, scaling loss is about The 2/3 of dolomite, the content of other gangues are relatively low.
Dolomite is substituted using the low calcined magnesite ball of carbonate content, reduces ironmaking processes CO2Discharge, material can be reduced The dust of transmission process, to produce 17000000 tons of sinters per year, unit consumption ore than 1.13, do proportioning 3% and adjust by dolomite, year consumption 57.63 ten thousand tons of dolomite, wherein because of MgCO3Decompose the CO of discharge2It is 13.03 ten thousand tons total, if using calcined magnesite ball, consume agglomerate 18.62 ten thousand tons, decompose discharge CO2It is 1.91 ten thousand tons total, reduce CO211.12 ten thousand tons are discharged, is equivalent to 4.12 ten thousand tons of mark coals of reduction Discharge.
After dolomite is replaced containing the high calcined magnesite ball of magnesium, the CaO in former dolomite can be supplemented by agstone, due to Calcined magnesite ball particle is big, favourable to granulating sinter mixture, can reduce the dosage of quick lime, is substituted with lime and provides CaO.Raw stone About 400 yuan/t of price, the about 100 yuan/t of agstone of ash, if being converted into a ton CaO sources, 490 yuan/t-CaO of quick lime price, lime 182 yuan/t-CaO of stone.The cost of sintering can be reduced to a certain degree.
In addition, using calcined magnesite ball, after can also solving magnesite calcining, the utilization problem of fine particle powder-form material is Liaoning water chestnut Leftover bits and pieces after magnesium ore deposit production light calcined magnesia finds rational comprehensive Utilization Ways.
Description of the drawings
Fig. 1 is the mosaic texture that calcined magnesite ball is formed in the bed of material;
Fig. 2 is the schematic diagram that air-flow flows through solid-state calcined magnesite ball;
Fig. 3 is the appearance (5~20mm) of calcined magnesite ball 1;
Fig. 4 is the section after mixing granulation in embodiment 1;
The appearance (on Fig. 5) of sinter and section on the basis of Fig. 5 (under Fig. 5);
Fig. 6 is that sinter appearance (on Fig. 6) made from calcined magnesite ball and section are used in embodiment 1 (under Fig. 6).
Specific embodiment
With reference to specific embodiment, the present invention is further elaborated, but does not limit the present invention.
Calcined magnesite ball 1 and 2 used in the present invention is provided by Shanghai Baoyue Fire-resistant Materials Co., Ltd., calcined magnesite ball 1 and 2 55 × 55mm of original aspect, thickness 25mm, pillow-type.Before experiment, with crusher by calcined magnesite ball 1 and 2 be crushed to granularity for 5~ 20mm is spare, appearance such as Fig. 3 of calcined magnesite ball 1.
The raw materials for sintering and conventional sintering of the present invention is carried out with dolomite ingredient scaling loss by GB/T6730.68-2009 methods Detection, testing result are as shown in table 1.
1 raw material for sintering chemical composition of table and scaling loss (%)
Project MgO CaO SiO2 Al2O3 TFe P2O5 S K2O Na2O Scaling loss
Iron ore blending ore 0.23 0.93 4.47 1.76 59.72 0.13 0.011 6.15
It returns mine 1.65 7.61 4.78 1.72 58.96 0.12 0.012
Coke powder 0.13 0.51 6.44 4.51 0.62 0.13 0.74 0.079 0.077 87.8
Quick lime 0.69 81.61 2.43 1.19 0.10 13.66
Agstone 0.41 54.97 0.63 0.17 0.13 42.92
Dolomite 20.56 30.92 1.66 0.32 0.16 0.01 0.014 45.67
Calcined magnesite ball 1 63.62 1.90 2.49 0.13 0.22 0.08 <0.005 0.016 0.012 30.25
Calcined magnesite ball 2 69.04 2.25 2.95 0.04 0.26 0.10 19.94
Note:Scaling loss is detected by GB/T6730.68-2009 methods, i.e., the weight loss of 1000 DEG C of ± 25 DEG C of calcination 1h in air.
In test, incorporation time 2min, Granulation time 5min, bed depth 780mm light a fire warm for benchmark example and embodiment 1050 DEG C, duration of ignition 1.5min of degree, sintering negative pressure are 14.7kPa, and examination is sintered using the sintered cup of a diameter of 300mm It tests, finished product sinter is according to GB/T 24531-2009 " measure of blast furnace and direct-reduction iron ore rotary drum and abrasion resistance index " Method is detected.Using agglomerates of sintered pellets after experiment, publishing house of Central South University, the General experimental side in 1996, P205-208 The indexs such as yield rate, usage factor, solid burnup are calculated in method.
MgO is provided using dolomite in the sintering test of benchmark example, the proportioning of other dispensings is calculated in weight percent to see Table 2 after dispensing, adds in the water mixing granulation for accounting for dry material weight 7.5%, is sintered afterwards by foregoing experiment flow, burns Knot technical parameter index is shown in Table 4.
Examples 1 to 6 substitutes dolomite dust using calcined magnesite ball, and the proportioning of other dispensings is calculated in weight percent to see Table 2 after dispensing, adds in the water mixing granulation for accounting for dry material weight 7.5%, is sintered afterwards by foregoing experiment flow, burns Knot technical parameter index is shown in Table 4.
Embodiment 1
The raw material of the present embodiment is as shown in table 2, by calcined magnesite ball 1 and Iron Ore Powder, returns mine, coke powder, quick lime, agstone It configures in proportion, it is then plus water mixing, granulation, cloth, igniting, sintering, cooling, broken, obtain sinter finished product, concrete operations Step is as follows:
By the calcined magnesite ball that granularity is 5~20mm, the Iron Ore Powder for being 0~8mm with granularity, granularity be the returning mine of 0~5mm, After coke powder that granularity is 0~3mm, the dispensing according to the above ratio that granularity is 0~3mm quick limes and granularity is 0~3 agstone, The water of addition 7.5% is uniformly mixed, and incorporation time is 2 minutes;Mixed material is pelletized, Granulation time is 5 points Clock after the particle made is distributed into a diameter of 300mm sintered cups, will form mosaic texture as shown in Figure 1, and bed depth is 780mm;1050 DEG C, duration of ignition 1.5min of firing temperature, sintering negative pressure are 14.7kPa, are sintered experiment, sintering terminates Afterwards, continue to be cooled down in sintered cup, after the mining single roll crusher of sintering after cooling is crushed, obtain sinter into Product.
Using the ARL 9900xp type Xray fluorescence spectrometers of ThermoFisher companies of the U.S. according to GB/T 6730.62-2005 analytical standards have carried out fluorescence analysis to the finished product sinter chemical composition, test the sinter finished product of gained Chemical composition and basicity be shown in Table 3.
2 sintering test list of ingredients of table (dry material weight, %)
The chemical composition of 3 sinter finished product of table and basicity (%)
Number TFe MgO CaO SiO2 Al2O3 R2(dual alkalinity)
Benchmark example 57.51 1.44 8.64 4.84 1.94 1.78
Embodiment 1 57.51 1.45 8.61 4.82 1.93 1.79
Embodiment 2 57.47 1.70 8.64 4.81 1.92 1.79
Embodiment 3 57.14 2.20 8.53 4.80 1.91 1.78
Embodiment 4 56.46 3.10 8.39 4.79 1.89 1.78
Embodiment 5 57.91 1.02 8.58 4.81 1.93 1.76
Embodiment 6 56.96 2.46 8.42 4.79 1.90 1.76
4 SINTERING TECHNOLOGY index of table
Note:Yield rate, usage factor, technical indicator when solid burnup is sinter returns balance (B=1 ± 0.05).
The more most significant difference of experiment of embodiment 1 and benchmark example is to substitute dolomite with 1.2% calcined magnesite ball 1 MgO is provided, the CaO in dolomite is substituted with lime stone, and the Iron grade, dual alkalinity, MgO amounts for obtaining sinter are basically unchanged. The usage factor of sintering is by 1.67t/m2* h is increased to 1.74t/m2* h, i.e. output increased amplitude reach 4.2%.Tumbler index omits There is decline, yield rate slightly improves, and solid burnup declines, and sintering highest exhaust gas temperature significantly rises, and is increased to by 509.6 DEG C 609.4 DEG C, after substituting dolomite this is mainly due to calcined magnesite ball, caused by carbonate decomposition heat dissipation is reduced in the bed of material.
Structure is as illustrated in Figures 5 and 6 after finished product sinter appearance and the calcined magnesite ball section of benchmark example and embodiment 1.By scheming It understands, the sinter appearance of benchmark example and microcosmic than more uniform.Calcined magnesite ball in embodiment 1 after sintering high temperature is undergone (~ 1400 DEG C), graininess is still maintained, surface is infiltrated or wrapped up by iron ore.
Embodiment 2
Using dispensing structure as shown in Table 2, experimental procedure is with reference to embodiment 1.Embodiment 2 and reference test are more aobvious The difference of work is the substitution dolomite offer MgO of calcined magnesite ball 1 with 1.5%, obtains Iron grade, the dual alkalinity base of sinter This is constant, and MgO amounts are increased to 1.70% by 1.44%.The usage factor of sintering is by 1.67t/m2* h is increased to 1.76t/m2* h, i.e., Output increased amplitude reaches 5.4%.As it can be seen that block-like high temperature resistant calcined magnesite ball, in sinter bed, plays improvement material really The effect of layer gas permeability, therefore vertical sintering speed, usage factor improve.Tumbler index is declined slightly, and yield rate improves, solid Burnup declines, and sintering highest exhaust gas temperature is increased to 598.3 DEG C by 509.6 DEG C.
Embodiment 3
Using dispensing structure as shown in Table 2, experimental procedure is with reference to embodiment 1.The proportioning of calcined magnesite ball 1 in embodiment 3 It improves to 2.2%, the dual alkalinity of sinter remains unchanged, and Iron grade slightly reduces, and content of MgO is increased to by 1.44% 2.20%.The usage factor of sintering is by 1.67t/m2* h is increased to 1.75t/m2* h, output increased amplitude reach 4.8%.Rotary drum refers to Number is declined slightly, and yield rate slightly improves, and solid burnup declines, and sintering highest exhaust gas temperature is increased to 552.3 by 509.6 DEG C ℃。
Embodiment 4
Using dispensing structure as shown in Table 2, experimental procedure is with reference to embodiment 1.The proportioning of calcined magnesite ball 1 in embodiment 4 Improve to 3.5%, the dual alkalinity of sinter slightly improves, and Iron grade is reduced to 56.46% by 57.51%, content of MgO by 1.44% is increased to 3.10%.The usage factor of sintering is by 1.67t/m2* h is increased to 1.81t/m2* h, output increased amplitude reach 8.4%.Tumbler index is declined slightly, and yield rate slightly reduces, and solid burnup declines, and sintering highest exhaust gas temperature is by 509.6 DEG C It is increased to 593.5 DEG C.
Embodiment 5
Using dispensing structure as shown in Table 2, experimental procedure is with reference to embodiment 1.It is taken in embodiment 4 using calcined magnesite ball 2 For dolomite, proportioning is 0.5%, and the dual alkalinity of sinter slightly reduces, and Iron grade is improved by 57.51% to 57.91%, Content of MgO is reduced to 1.02% by 1.44%.The usage factor of sintering is by 1.67t/m2* h is increased to 1.71t/m2* h, yield carry High-amplitude 2.4%.Tumbler index is declined slightly, and yield rate is substantially suitable, solid burnup decline, sintering highest exhaust gas temperature by 509.6 DEG C are increased to 557.7 DEG C.
Embodiment 6
Using dispensing structure as shown in Table 2, experimental procedure is with reference to embodiment 1.Dolomite is substituted using calcined magnesite ball 2, It is matched as 2.4%, and the dual alkalinity of sinter slightly reduces, and Iron grade is reduced to 56.96% by 57.51%, content of MgO by 1.44% improves to 2.46%.The usage factor of sintering is by 1.67t/m2* h is increased to 1.73t/m2* h, output increased amplitude 3.6%.Tumbler index is declined slightly, and yield rate slightly improves, and solid burnup declines, and sintering highest exhaust gas temperature is by 509.6 DEG C It is increased to 602.4 DEG C.
The present inventor passes through theory analysis and experimental study, the results showed that, in sintering production process, do not changing On the premise of becoming sinter overall chemical ingredient, dolomite is substituted using the calcined magnesite ball of 5~20mm of granularity, forms heterogeneous knot Structure can improve the gas permeability of sinter bed, improve sintering usage factor, obtain the excellent sinter of metallurgical performance.Meanwhile it can carry The yield of high sinter reduces sintering process CO2Discharge reduces solid fuel consumption.

Claims (7)

1. a kind of iron ore sintering method using calcined magnesite ball, which is characterized in that it comprises the following steps:
1) following component is made into dry material by weight percentage:Calcined magnesite ball 0.5~3.5%, Iron Ore Powder 60~65% are returned mine 20~25%, coke powder 3.5~4.5%, flux 5~11%;The water for adding dry material total weight 7.0~8.5% is mixed Uniformly;
2) mixed material is put into mixer, carries out mixing granulation, 5~8min of Granulation time;
3) mixture after granulation is uniformly distributed into sintered cup;
4) light a fire to mixture in sintered cup, firing temperature is 1050 DEG C ± 50 DEG C, 1.5~2.5min of the duration of ignition, point Fiery 7~8kPa of negative pressure;
5) after the completion of lighting a fire, mix coke powder in the bed of material and be ignited, adjust negative pressure to 14~16kPa, mixture starts to be sintered, sintering After, continue to be cooled down in sintered cup;
6) after sinter after cooling is crushed, sinter finished product is obtained.
2. iron ore sintering method as described in claim 1, which is characterized in that in step 1), the ingredient of the calcined magnesite ball Include by weight percentage:Content of MgO 60~85%, CaO content<2.5%, SiO2Content<3.0%, Al2O3Content< 0.3%.
3. iron ore sintering method as claimed in claim 2, which is characterized in that in step 1), the ingredient of the calcined magnesite ball Include by weight percentage:Content of MgO 60~70%, CaO content 1.5~2.3%, SiO2Content 2.4~3.0%, Al2O3Content 0~0.015%.
4. iron ore sintering method as claimed in claim 2 or claim 3, which is characterized in that the granularity of the calcined magnesite ball for 5~ 20mm, compression strength are more than 1000N/, and shape is block or spherical.
5. iron ore sintering method as described in claim 1, which is characterized in that in step 1),
The Iron Ore Powder is the iron ore blending ore of one or more of magnetic iron ore, bloodstone, limonite;
The flux is one or more of lime stone, quick lime;It is preferred that the flux is the mixed of quick lime and lime stone Close object.
6. iron ore sintering method as described in claim 1, which is characterized in that in step 1),
The granularity of the Iron Ore Powder is in below 8mm, below the granularity 5mm to return mine;
0~3mm of granularity of the coke powder, 0~3mm of flux granularity;
The flux is quick lime and lime stone using parts by weight as 2~5:The mixture of 3~6 compositions.
7. iron ore sintering method as described in claim 1, which is characterized in that in step 6), described is broken for using monodentate Roll crusher is crushed.
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