CN104164558B - A kind of sintering circuit sinter quality control method - Google Patents
A kind of sintering circuit sinter quality control method Download PDFInfo
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- CN104164558B CN104164558B CN201410427967.8A CN201410427967A CN104164558B CN 104164558 B CN104164558 B CN 104164558B CN 201410427967 A CN201410427967 A CN 201410427967A CN 104164558 B CN104164558 B CN 104164558B
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Abstract
The invention discloses a kind of sintering circuit sinter quality control method, it comprise start sintering before and sintering process in regulate flux ratio, the basicity of dedusting ash is regulated to make it identical with the basicity in object product sinters ore deposit with flux, according to color and the globule size control digestion water consumption of unslaked lime, and return the cycling time with BF return fines in setting sintering, and regular sample examination basicity, SiO
2, CaO content meter calculate the flux ratio that follow-up batching need raise or lower, then according to this ratio, the flux consumption in batching to be adjusted.The impact on sinter quality that the present invention greatly reduces " various schools of thinkers ore deposit ", improves the stability of sinter quality; To be chemically examined by Sinter Component and quantitative adjusting is carried out in calculating, improve " the anticipation power " of operator, grasp quality fluctuation trend and amplitude, greatly shorten the time of adjustment " delayed "; Complicated, loaded down with trivial details charge calculation simplified, easy handling personnel grasp and operation.
Description
Technical field
Embodiments of the present invention relate to Iron and Steel Production manufacture field, and more specifically, embodiments of the present invention relate to a kind of sintering circuit sinter quality control method.
Background technology
Along with Iron And Steel Industry production technology improves further, operate under making the capacity factor of a blast furnace can remain on higher level, ensure blast fumance stable smooth operation, reduce molten iron cost, feed stock for blast furnace is had higher requirement.In the every key technical index of agglomerate, the stable of quality is the most important thing.Current sinter quality controls the following objective restrict factor of ubiquity:
(1) eat in " various schools of thinkers ore deposit ".In recent years because price of steel product continues to fall, and external high-quality iron ore price is high, there is loss in most domestic iron and steel enterprise, reduce costs the increasing pressure weight of seeking survival, many steel mills all turn in " the various schools of thinkers ore deposit " of domestic price relative moderate, various schools of thinkers ore deposit refers to that the place of production is many, amount less, second-rate ore.As our factory uses in " various schools of thinkers ore deposit " in a large number, it has the features such as many, the mutual component differences in the place of production are large, although through first and second stock ground process, blending ore fluctuation is still larger.
(2) conventional sintering mineral amount control method is that the adjustment of the method process relativity is very long for retardation time according to finished product agglomerate chemical examination composition adjustment material proportion.Because of technological reason, produce long to going out the Sinter Component result of laboratory test time cycle from feeding intake, example is sintered to our factory 210m2, raw material feeds intake to produce to finished belt from proportioning room and can get sample for up to 3-4 hour, add sample preparation, chemical examination, go out result and be about 1-2 hour, time lag is about 4-5 hour, in daily production, the method can not meet needs of production, often causes Sinter Component fluctuation.
(3) ratio of components is calculated according to crude fuel chemical examination composition.Because crude fuel is wide in variety, and must consider the impact sintering recycle when calculating, charge calculation is very complicated, easily makes mistakes; Simultaneously because crude fuel is wide in variety, treatment capacity large, each crude fuel sample representation is poor, and deviation appears in the inaccurate calculation result that all can cause of individual other style, and then causes Sinter Component to fluctuate.
Therefore, need badly and a kind of simple working method is provided, to the method for composition adjustment be chemically examined according to agglomerate and combine according to the method that crude fuel composition calculates, thus " stable operation ", improve " the anticipation power " of operator, accurate grasp quality fluctuation trend and amplitude, shorten " delayed " time, improves sinter quality.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, a kind of embodiment of sintering circuit sinter quality control method is provided, by adopting novel method calculating composition adjustment amount to realize stable operation after quality control in earlier stage and later stage sample examination, improve the anticipation power of operator, shorten retardation time, improve sinter quality.
For solving above-mentioned technical problem, one embodiment of the present invention by the following technical solutions:
A kind of sintering circuit sinter quality control method, it comprises:
A, start sintering before and in sintering process when preparing burden with at least one in Wingdale, rhombspar and unslaked lime for flux;
B, start to sinter before and in sintering process when preparing burden sampling detect the SiO of dedusting ash
2content and CaO content, and regulate the basicity of dedusting ash to make it identical with the basicity in object product sinters ore deposit with the flux described in steps A;
C, comprise unslaked lime and unslaked lime is light yellow when the flux used, according to the mass ratio 1:0.45 ~ 0.5 digestive organ assimilation of quicklime using of unslaked lime and water; When the flux used comprises unslaked lime and unslaked lime is white, according to the mass ratio 1:0.65 ~ 0.75 digestive organ assimilation of quicklime using of unslaked lime and water;
The cycling time returned in sintering in D, sintering process is 3 ~ 4 hours, and the cycling time of BF return fines is 7 ~ 8 hours;
Regularly sample examination is carried out to sample ore in E, sintering process and obtain SiO
2, the content of CaO and sinter basicity, as the current SiO of agglomerate
2front four SiO of mass content and agglomerate
2when the difference that the difference of the mean value of mass content is 0.2% ~ 0.5%, basicity needs to require to carry out to adjust according to blast furnace or the fluctuation range of current sinter basicity exceeds the mean value of the current C aO mass content of agglomerate target basicity 0.1 or agglomerate and front four CaO mass content of agglomerate is 0.3% ~ 1%, with the basicity of at least one adjustment agglomerate in Wingdale, rhombspar and unslaked lime.
Sintering is a continuously technique, in sintering process, constantly carry out preparing burden and regulate agglomerate SiO in time according to raw material and fuel quality situation
2content, CaO content and basicity, ensure that agglomerate product meets blast furnace specification of quality, for blast furnace provides High-quality Sinters.Sample examination obtains the current SiO of agglomerate
2mass content, current C aO mass content and current basicity, by contrasting with acceptance value, when there is the situation needing to adjust flux ratio, just raise the flux ratio in follow-up batching or lower, rise is basicity, SiO in order to raise follow-up sintering ore deposit
2mass content and CaO mass content, downward is to reduce follow-up high sinter basicity, SiO
2mass content and CaO mass content, final object is all the basicity, the SiO that make agglomerate
2mass content and the fluctuation of CaO mass content are in normal range.
According to one embodiment of the present invention, described basicity needs to require that carrying out adjustment refers to according to the decision rise of blast furnace slag making needs or lower agglomerate target basicity according to blast furnace; The fluctuation range of current sinter basicity exceeds agglomerate target basicity 0.1 and refers to current sinter basicity > agglomerate target basicity+0.1 or current sinter basicity < agglomerate target basicity-0.1, flux ratio is lowered when current sinter basicity > agglomerate target basicity+0.1, raise flux ratio when current sinter basicity < agglomerate target basicity-0.1, the operation steps raising or lower flux ratio is:
First, within last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=R poor × S/ (M × 0.8);
Then, after last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=R poor × S/M;
Wherein, R difference is the difference of current sinter basicity and agglomerate target basicity, and S is current agglomerate SiO
2mass content, M is the mass content of the effective CaO of current flux.
According to one embodiment of the present invention, the current SiO of described agglomerate
2front four SiO of mass content and agglomerate
2the difference of the mean value of mass content is 0.2% ~ 0.5% and the current SiO of agglomerate
2front four SiO of mass content > agglomerate
2flux ratio is lowered, the current SiO of described agglomerate during the mean value of mass content
2front four SiO of mass content and agglomerate
2the difference of the mean value of mass content is 0.2% ~ 0.5% and the current SiO of agglomerate
2front four SiO of mass content < agglomerate
2raise flux ratio during the mean value of mass content, the operation steps raising or lower flux ratio is:
First, within last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=S poor × R/ (M × 0.8);
Then, after last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=S poor × R/M;
Wherein, R is agglomerate target basicity, and S difference is the current SiO of agglomerate
2mass content and front four SiO of agglomerate
2the difference of mass content mean value, M is the mass content of the effective CaO of current flux.
According to one embodiment of the present invention, the difference of the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate be 0.3% ~ 1% and the mean value of front four CaO mass content of the current C aO mass content > agglomerate of agglomerate time lower flux ratio, the difference of the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate be 0.3% ~ 1% and the mean value of front four CaO mass content of the current C aO mass content < agglomerate of agglomerate time raise flux ratio, the operation steps raising or lower flux ratio is:
First, within last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=CaO poor/(M × 0.8);
Then, after last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=CaO poor/M;
Wherein, CaO difference is the difference of the mass content mean value of front four CaO of agglomerate current C aO mass content and agglomerate, and M is the mass content of the effective CaO of current flux.
The working method of flux ratio is regulated to be when Sinter Component occurs abnormal under above-mentioned three kinds of different situations, the flux ratio of follow-up batching is adjusted, during adjustment, before wanting, average CaO, SiO2 content of four sintering sample ores is the foundation calculated, constantly at sample examination in sintering process, average CaO, SiO2 content of front four sintering sample ores can calculate in the past data of 4 times." last flux ratio adjustment " refer in sintering process this calculate and the front flux ratio adjustment of adjustment." within last flux ratio adjustment two and one-half-hours " belong to larger adjustment to the adjustment of flux ratio, and the adjustment of " after last flux ratio adjustment two and one-half-hours " belongs to readjustment, and flux resize ratio is little.
Preferably, in described lurid unslaked lime during granular mass content >=80% of granularity≤3mm, according to the mass ratio 1:0.5 digestive organ assimilation of quicklime using of unslaked lime and water; In described lurid unslaked lime during the granular mass content < 80% of granularity≤3mm, according to the mass ratio 1:0.45 digestive organ assimilation of quicklime using of unslaked lime and water.
Preferably, in the unslaked lime of described white during granular mass content >=80% of granularity≤3mm, according to the mass ratio 1:0.65 digestive organ assimilation of quicklime using of unslaked lime and water; In the unslaked lime of described white during the granular mass content < 80% of granularity≤3mm, according to the mass ratio 1:0.75 digestive organ assimilation of quicklime using of unslaked lime and water.
The granularity of unslaked lime is excessively thick, easily causes blocking and nondigestible, therefore needs to strengthen water consumption and ensures oarse-grained unslaked lime complete digestion.
The CaO mass content of described Wingdale is 45 ~ 55%, the CaO mass content of rhombspar is 30 ~ 35%, the CaO mass content of unslaked lime is 75 ~ 85%, when needing in sintering process to adjust the flux ratio of follow-up batching after sample examination, being used alone Wingdale, being used alone rhombspar and being used alone unslaked lime to the mass ratio that flux ratio adjusts is 10:6:15 ~ 17.Such as, need the Wingdale adding 10 parts to adjust flux ratio after certain chemical examination, so Wingdale being changed into unslaked lime then needs 15 ~ 17 parts.
Further technical scheme is: described unslaked lime is faint yellow and after digestion completely, gained white lime becomes grain slag shape, then in white lime, add the Wingdale of in mass 0.3 ~ 0.5% or add unslaked lime by the mass content of Wingdale, rhombspar, unslaked lime than 10:6:15 ~ 17 and carry out Mass adjust-ment.Flaxen Lime Quality is poor, if digested according to the water consumption preset, easily becomes grain slag shape after digestion, at this moment needs the consumption increasing Wingdale or unslaked lime, the state of adjustment white lime.
Further technical scheme is: return in described sintering and be generically and collectively referred to as cold returning with BF return fines, wherein, returns quality and account for and coldly return 55 ~ 65% of quality in sintering, and BF return fines quality accounts for coldly returns 35% ~ 45% of quality.
Produce first grade agglomerate time, described current sinter basicity lower than agglomerate target basicity-0.05 need raise flux ratio or higher than agglomerate target basicity+0.05 time need lower flux ratio, its operation steps adopts operation steps according to claim 2.
Compared with prior art, one of beneficial effect of the present invention is: (1) greatly reduces " various schools of thinkers ore deposit " impact on sinter quality, improves the stability of sinter quality; (2) to be chemically examined by Sinter Component and quantitative adjusting is carried out in calculating, improve " the anticipation power " of operator, grasp quality fluctuation trend and amplitude, greatly shorten the time of adjustment " delayed "; (3) complicated, loaded down with trivial details charge calculation simplified, easy handling personnel grasp and operation; (4) method of calculation are simple, can be applicable in the programdesign relevant to sintered material, can adjust raw material, fuel ratio timely and accurately.
Accompanying drawing explanation
Fig. 1 is sintering circuit schematic flow sheet of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
At quality control procedure, the adjustment of sinter basicity (R) can be related to, sinter basicity determines according to the basicity of slag specified during blast-furnace smelting, and the basicity of slag of blast furnace depends primarily on the basicity of feed stock for blast furnace, therefore, enter the condition of stove at single agglomerate under, the basicity of slag depends on the basicity of agglomerate, because basicity of slag requires certain, therefore the basicity of agglomerate also should be certain.
Fig. 1 is the master operation schema of sintering circuit, the first step of sintering circuit to be prepared burden, batching comprises iron-bearing material, flux (Wingdale, rhombspar and unslaked lime etc.), fuel (coke powder, coal dust), returns mine and dedusting ash, and sinter quality control process continues up to sintering circuit and terminates from sintering circuit.Flux ratio is the first step during sintering quality controls, the CaO mass content of Wingdale is 45 ~ 55%, the CaO mass content of rhombspar is 30 ~ 35%, the CaO mass content of unslaked lime is 75 ~ 85%, when needing in sintering process to adjust the flux ratio of follow-up batching after sample examination, being used alone Wingdale, being used alone rhombspar and being used alone unslaked lime to the mass ratio that flux ratio adjusts is 10:6:15 ~ 17; Return mine and be cold returning, cold return to comprise in sintering return and BF return fines, in sintering circuit, the cycling time returned in sintering is 3 ~ 4 hours, the cycling time of BF return fines is 7 ~ 8 hours, returns quality and account for and coldly return 55 ~ 65% of quality in sintering, and BF return fines quality accounts for coldly returns 35% ~ 45% of quality, the cold quality returned and consumption affect comparatively large on SINTERING PRODUCTION, return middle CaO, SiO although cold
2content and Sinter Component are substantially identical, but also will consider the cold cycling time returned when adjusting sinter basicity R in sintering circuit; The sintering circuit initial stage, when preparing burden, also will sample the SiO detecting dedusting ash
2content and CaO content, under normal circumstances, dedusting ash compared with Sinter Component, its SiO
2content is relatively higher, CaO content is relatively on the low side, therefore before use dedusting ash, the CaO content in dedusting ash need be regulated to make it identical with the basicity in object product sinters ore deposit with flux, generally the mass content of the unslaked lime in flux is improved 0.1 ~ 0.3% and just can reach adjustment object.If flux employs unslaked lime, so use digestive organ assimilation of quicklime using after batching, the mass discrepancy of unslaked lime can have a great impact later stage sintering process, therefore needs to control the quality of unslaked lime.When unslaked lime is light yellow, the mass ratio of unslaked lime and water can be 1:0.45 ~ 0.5; The granular size of unslaked lime can affect digestive process and sintering process below, if in lurid unslaked lime during granular mass content >=80% of granularity≤3mm, the optimum quality of unslaked lime and water is than being 1:0.5; In lurid unslaked lime during the granular mass content < 80% of granularity≤3mm, the optimum quality of unslaked lime and water is than being 1:0.45.When unslaked lime is white, the mass ratio of unslaked lime and water can be 1:0.65 ~ 0.75; In the unslaked lime of white during granular mass content >=80% of granularity≤3mm, the optimum quality of unslaked lime and water is than being 1:0.65; In the unslaked lime of white during the granular mass content < 80% of granularity≤3mm, the optimum quality of unslaked lime and water is than being 1:0.75.White lime is obtained after unslaked lime complete digestion, as unslaked lime be light yellow or in digestive process steam few, form becomes grain slag shape, then should add the Wingdale of mass content 0.3 ~ 0.5% or appropriate unslaked lime to adjust the content of CaO in liming, the effective CaO that solution causes due to Lime Quality difference and digestible degree difference contains quantity not sufficient or instability, when adjusting according to interpolation unslaked lime, notice that the amount that unslaked lime adds can not be too much, meet and be used alone Wingdale, being used alone rhombspar and being used alone unslaked lime to the mass ratio that flux ratio adjusts is 10:6:15 ~ 17.After having prepared burden one is mixed, two mix, cloth and sintering process are conventional sintering circuit steps, heat after sintering starts is broken, bulk cargo, main electric precipitation and ring cold, multi-stage screenings etc. are indispensable steps in sintering circuit, and after sintering circuit starts, must regularly chemically examine the composition of agglomerate, therefore regular sample examination in sintering process is needed, such as in whole sintering process, within every two hours, carry out sample examination, according to chemical examination acquired results, a Mass adjust-ment is carried out to agglomerate after each chemical examination, the basicity of all agglomerate is become to assign to regulate by certain in adjustment flux, SiO
2content, CaO content etc.In sintering process, usually four kinds of situations are had to need to regulate flux ratio: one is that agglomerate object product changes, agglomerate target basicity needs to require to carry out adjusting to adapt to new object product according to blast furnace, two is scopes that the fluctuation range of current sinter basicity exceeds basicity value ± 0.1 needed for production object product sinters ore deposit, and three is current SiO of agglomerate
2front four SiO of mass content and agglomerate
2the difference of the mean value of mass content is 0.2% ~ 0.5%, four are differences of the mean value of the current C aO mass content of agglomerate and front four CaO mass content of agglomerate is 0.3% ~ 1%, the present invention is according to these four kinds different abnormal conditions, provide three kinds of different method of calculation, the flux ratio needing to add in agglomerate can be calculated fast, the flux ratio of the rise of such as calculating is 1%, and the flux mass content of adding during sintering beginning is 5%, so after current flux ratio adjustment, the flux total mass content of interpolation is 6%.When adjusting according to the flux ratio calculated, Wingdale or unslaked lime is usually adopted to adjust, containing more magnesiumcarbonate in rhombspar, therefore less employing.If the basicity of agglomerate, SiO
2the fluctuation of content, CaO content is very large, as current SiO
2front four SiO of mass content and agglomerate
2the difference of the mean value of mass content more than 0.5% or the difference of the mean value of front four CaO mass content of the current C aO mass content of agglomerate and agglomerate more than 1%, then for fluctuation is abnormal, need resample and chemically examine because fluctuation abnormal normally because the sampling of finished product agglomerate is improper, significant change appears in raw material and fuel quality (as stock yard heap batching go wrong, batch mixing etc.) cause.
The quality controlling means that should adopt when illustrating and occur different sinter quality fluctuations below by specific embodiment according to result of laboratory test, especially needs the method for calculation of the flux ratio of adding.
Embodiment 1
The total upper doses 400t of A, sintering, the 160t that always returns mine, fuel 12t, Wingdale 12t, rhombspar 7.2t, unslaked lime 14.4t, blending ore 194.4t, dedusting ash 10t join in its China and foreign countries, Wingdale the active calcium ion content 45%, unslaked lime the active calcium ion content 75%, rhombspar the active calcium ion content 35%, object product sinters ore deposit requires that R is 2.
When B, batching, the CaO mass ratio of Wingdale, rhombspar, unslaked lime is 10:6:15, namely as adjustment basicity need raise unslaked lime amount 1t, then needs 1.5t by adjustment Wingdale, as adjustment rhombspar then needs 2.5t.
When C, batching, the SiO of chemical examination dedusting ash
2content and CaO content, result of laboratory test is SiO
2content 6%, CaO content 10.8%, R is 1.8, low by 0.2 compared with requiring, therefore needing the CaO content regulating dedusting ash with flux, then need to increase amount of lime 0.24t, then needing 0.16t as increased unslaked lime, use rhombspar then to need 0.4t, now the R of dedusting ash is identical with the R that agglomerate requires or difference is very little.
D, rear digestive organ assimilation of quicklime using of having prepared burden, it is light yellow for observing unslaked lime color, and in unslaked lime, the particle of particle diameter≤3mm accounts for more than 80% (about 85%), and therefore the consumption of water is 7.2t, is just in time the half of Lime Quality.
After E, sintering start, return about 3 hours cycling time in sintering, about 8 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 55% of cold total amount of returning mine, is 88t, and BF return fines amount accounts for coldly returns 45% of total amount, is 72t.
After F, sintering start, need to chemically examine sample ore in whole flow process, sampling in every two hours, SiO in chemical examination agglomerate
2, the content of CaO and sinter basicity; Result of laboratory test is: SiO
2content 6%, CaO content 11.4%, sinter basicity is 1.9, the R required compared with object product sinters ore deposit is low by 0.1, therefore sinter basicity is needed to be adjusted to 2 from 1.9, first from once flux ratio adjustment two and one-half-hours within, unslaked lime is added in agglomerate, adding proportion is (2-1.9) × 6%/(75% × 0.8)=1%, i.e. (400-160) × 1%=2.4t, unslaked lime amount is increased to 16.8t (=14.4+2.4) with addition of amount.Then after last flux ratio adjustment two and one-half-hours, unslaked lime is added in agglomerate, adding proportion is (2-1.9) × 6%/75%=0.8%, i.e. (400-160) × 0.8%=1.92t, unslaked lime pulls back to 16.32t (=14.4+1.92) with addition of amount, this time adjustment is less, belongs to the readjustment after large adjustment; Last flux ratio adjustment mentioned here, the adjustment after all referring to last sample examination, agglomerate carried out.
Embodiment 2
The total upper doses 400t of A, sintering, the 160t that always returns mine, fuel 12t, rhombspar 7.2t, Wingdale 12t, unslaked lime 14.4t, blending ore 194.4t, dedusting ash 10t join in its China and foreign countries, the R that object product sinters ore deposit requires is 2, Wingdale the active calcium ion content 50%, unslaked lime the active calcium ion content 85%, rhombspar the active calcium ion content 30%.
When B, batching, the CaO mass ratio of Wingdale, rhombspar, unslaked lime is 10:6:17, namely as adjustment basicity need raise unslaked lime amount 1t, then needs 1.7t by adjustment Wingdale, as adjustment rhombspar then needs 2.83t.
When C, batching, the SiO of chemical examination dedusting ash
2content and CaO content, result of laboratory test is SiO
2content 6%, CaO content 10.8%, R is 1.8, low by 0.2 compared with requiring, therefore needing the CaO content regulating dedusting ash with flux, then need to increase amount of lime 0.24t, then needing 0.14t as increased unslaked lime, use rhombspar then to need 0.4t, now the R of dedusting ash is identical with the R that agglomerate requires or difference is very little.
D, rear digestive organ assimilation of quicklime using of having prepared burden, observing unslaked lime color is white, and in unslaked lime, the granule content of particle diameter≤3mm is less than 80% (about 68%), and therefore the consumption of water is 10.8t, is just in time 0.75 times of Lime Quality.
After E, sintering start, return about 4 hours cycling time in sintering, about 7 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 65% of cold total amount of returning mine, is 104t, and BF return fines amount accounts for coldly returns 35% of total amount, is 56t.
After F, sintering start, need to chemically examine sample ore in whole flow process, sampling in every two hours, SiO in chemical examination agglomerate
2, the content of CaO and sinter basicity; Front four average SiO of sample
2content is the content of 6.1%, CaO is 12.1%, and this result of laboratory test is: SiO
2content is 5.8%, the content of CaO is 12%, and sinter basicity is 2.07, and this result of laboratory test and front four results of laboratory test compare, SiO
2content fluctuation is comparatively large, current SiO
2content and front four the sample SiO of agglomerate
2difference>=0.2% of content mean value, therefore need to lower flux ratio, select to lower Wingdale ratio, within last flux ratio adjustment two and one-half-hours, it is (6.1%-5.8%) × 2/ (50% × 0.8)=1.5% that Wingdale lowers ratio, i.e. (400-160) × 1.5%=3.6t, Wingdale is increased to 8.4t (=12-3.6) with addition of amount; Then adjust back after last flux ratio adjustment two and one-half-hours, resize ratio is (6.1%-5.8%) × 2/50%=1.2%, i.e. (400-160) × 1.2%=2.88t, Wingdale pulls back to 9.12t (=12-2.88) with addition of amount.
Embodiment 3
The total upper doses 400t of A, sintering, the 160t that always returns mine, fuel 12t, rhombspar 7.2t, Wingdale 12t, unslaked lime 14.4t, blending ore 194.4t, dedusting ash 10t join in its China and foreign countries, agglomerate production requirement R is 2, Wingdale the active calcium ion content 55%, unslaked lime the active calcium ion content 80%, rhombspar the active calcium ion content 30%.
When B, batching, the CaO mass ratio of Wingdale, rhombspar, unslaked lime is 10:6:16, namely as adjustment basicity need raise unslaked lime amount 1t, then needs 1.6t by adjustment Wingdale, as adjustment rhombspar then needs 2.67t.
When C, batching, the SiO of chemical examination dedusting ash
2content and CaO content, result of laboratory test is SiO
2content 6%, CaO content 10.8%, R is 1.8, low by 0.2 compared with requiring, therefore needing the CaO content regulating dedusting ash with flux, then need to increase amount of lime 0.24t, then needing 0.15t as increased unslaked lime, use rhombspar then to need 0.4t, now the R of dedusting ash is identical with the R that agglomerate requires or difference is very little.
D, rear digestive organ assimilation of quicklime using of having prepared burden, observing unslaked lime color is white, and in unslaked lime, the particle of particle diameter≤3mm accounts for more than 80% (about 90%), and therefore the consumption of water is 9.36t, is just in time 0.65 times of Lime Quality.
After E, sintering start, return about 3 hours cycling time in sintering, about 8 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 60% of cold total amount of returning mine, is 96t, and BF return fines amount accounts for coldly returns 40% of total amount, is 64t.
After F, sintering start, need to chemically examine sample ore in whole flow process, sampling in every two hours, SiO in chemical examination agglomerate
2, the content of CaO and sinter basicity, front four average SiO of sample
2content is the content of 6.1%, CaO is 12.1%, and this result of laboratory test is: SiO
2content is 5.98%, the content of CaO is 12.55%, sinter basicity is 2.1, this result of laboratory test and front four results of laboratory test compare, the fluctuation of CaO content is larger, difference>=0.3% of current C aO content and front four the sample CaO content mean values of agglomerate, therefore need to lower flux ratio, select to lower Wingdale and unslaked lime ratio simultaneously, within last flux ratio adjustment two and one-half-hours, first lower unslaked lime ratio 0.3%, i.e. (400-160) × 0.3%=0.72t, unslaked lime amount is adjusted downward to 13.68t, then Wingdale lowers ratio is (12.55%-12.1%)/(50% × 0.8)-0.3% × 1.6=0.64%, i.e. (400-160) × 0.64%=1.54t, Wingdale is adjusted downward to 10.46t with addition of amount, then adjust back after last flux ratio adjustment two and one-half-hours, resize ratio is (12.55%-12.1%)/50%-0.3% × 1.6=0.42%, i.e. (400-160) × 0.42%=1t, and Wingdale pulls back to 11t with addition of amount.
Embodiment 4
Regulating step A, B, C are identical with embodiment 3.
D, rear digestive organ assimilation of quicklime using of having prepared burden, it is light yellow for observing unslaked lime color, and in unslaked lime, the particle of granularity≤3mm is less than 80% (about 78%), and therefore the consumption of water is 6.48t, is just in time 0.45 times of Lime Quality.After digestion completely, gained white lime becomes grain slag shape, then the Wingdale adding 0.065t in mass in white lime carries out Mass adjust-ment.
After E, sintering start, return about 3 hours cycling time in sintering, about 8 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 60% of cold total amount of returning mine, is 96t, and BF return fines amount accounts for coldly returns 40% of total amount, is 64t.
After F, sintering start, need to chemically examine sample ore in whole flow process, sampling in every two hours, SiO in chemical examination agglomerate
2, the content of CaO and sinter basicity; Front four average SiO of sample
2content is the content of 6.2%, CaO is 12.05%, and this result of laboratory test is: SiO
2content is 5.97%, the content of CaO is 12.56%, and sinter basicity is 2.1, then carries out calculating and adjusting according to the step shown in embodiment 3.
This working method is promoted in March, 2011 in 105 sintering mill (plant)s, production line operator react good, and be applied in 210 sintered material programdesigns when the end of the year, make 210 dispensing operation system operations more simple and direct, convenient, most of concrete calculating, by the replacement such as computer, program, substantially increases the accuracy of batching, decreases computing time, significantly reduce the labour intensity of dispensing operation personnel, be conducive to the stability improving sinter quality.In February, 2012, this methodology was just popularized in an all-round way in 210 sintering mill (plant)s, and achieve good effect, within 2013,210 sintering quality particular cases are as follows between 210 sintering trial production periods:
(1) agglomerate comprehensive qualified rate, the ratio of first-grade products, FeO index of stability progressively improve
Table 1:210 sinters primary quality measure performance in recent years
Table 2:2013 periphery in May colleague producer sintering R index of stability performance
Can find out that our factory primary quality measure in 2013 all rises more by table 1, table 2, and the producer that more national particularly periphery is former, fuel is close, sinter quality stability maintains better level.
(2) substantially quality accident is stopped.Along with these Manipulative promotion and application, continuous low useless, the high useless phenomenon of agglomerate obviously reduces, within 2013, continuous two samples of annual 210 sintering are low useless or high useless only 4 times, obviously reduce, and quality accident together (continuous three waste products) does not occur for monthly compared with former years 2-3 time.
(3) easy, practical, workable.Be applied to after in 210 sintered material system designs and production practice from this methodology, complicated, loaded down with trivial details charge calculation is made to become easy, practical, worker is easy to grasp and operation, labour intensity reduces greatly, in the analysis to basicity, judgement and adjustment, precision, to be swiftnessly largely increased, to efficiently reduce the disadvantageous effect that " delayed " phenomenon is brought.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (9)
1. a sintering circuit sinter quality control method, is characterized in that it comprises the following steps:
A, start sintering before and in sintering process when preparing burden with at least one in Wingdale, rhombspar and unslaked lime for flux;
B, start to sinter before and in sintering process when preparing burden sampling detect the SiO of dedusting ash
2content and CaO content, and regulate the basicity of dedusting ash to make it identical with the basicity in object product sinters ore deposit with the flux described in steps A;
C, comprise unslaked lime and unslaked lime is light yellow when the flux used, according to the mass ratio 1:0.45 ~ 0.5 digestive organ assimilation of quicklime using of unslaked lime and water; When the flux used comprises unslaked lime and unslaked lime is white, according to the mass ratio 1:0.65 ~ 0.75 digestive organ assimilation of quicklime using of unslaked lime and water;
The cycling time returned in sintering in D, sintering process is 3 ~ 4 hours, and the cycling time of BF return fines is 7 ~ 8 hours;
Regularly sample examination is carried out to sample ore in E, sintering process and obtain SiO
2, the content of CaO and sinter basicity, as the current SiO of agglomerate
2front four SiO of mass content and agglomerate
2when the difference that the difference of the mean value of mass content is 0.2% ~ 0.5%, basicity needs to require to carry out to adjust according to blast furnace or the fluctuation range of current sinter basicity exceeds the mean value of the current C aO mass content of agglomerate target basicity 0.1 or agglomerate and front four CaO mass content of agglomerate is 0.3% ~ 1%, with the basicity of at least one adjustment agglomerate in Wingdale, rhombspar and unslaked lime;
Described basicity needs to require that carrying out adjustment refers to according to the decision rise of blast furnace slag making needs or lower agglomerate target basicity according to blast furnace; The fluctuation range of current sinter basicity exceeds agglomerate target basicity 0.1 and refers to current sinter basicity > agglomerate target basicity+0.1 or current sinter basicity < agglomerate target basicity-0.1, flux ratio is lowered when current sinter basicity > agglomerate target basicity+0.1, raise flux ratio when current sinter basicity < agglomerate target basicity-0.1, the operation steps raising or lower flux ratio is:
First, within last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=R poor × S/ (M × 0.8); Then, after last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=R poor × S/M;
Wherein, R difference is the difference of current sinter basicity and agglomerate target basicity, and S is current agglomerate SiO
2mass content, M is the mass content of the effective CaO of current flux.
2. sintering circuit sinter quality control method according to claim 1, is characterized in that the current SiO of described agglomerate
2front four SiO of mass content and agglomerate
2the difference of the mean value of mass content is 0.2% ~ 0.5% and the current SiO of agglomerate
2front four SiO of mass content > agglomerate
2flux ratio is lowered, the current SiO of described agglomerate during the mean value of mass content
2front four SiO of mass content and agglomerate
2the difference of the mean value of mass content is 0.2% ~ 0.5% and the current SiO of agglomerate
2front four SiO of mass content < agglomerate
2raise flux ratio during the mean value of mass content, the operation steps raising or lower flux ratio is:
First, within last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=S poor × R/ (M × 0.8); Then, after last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=S poor × R/M;
Wherein, R is agglomerate target basicity, and S difference is the current SiO of agglomerate
2mass content and front four SiO of agglomerate
2the difference of mass content mean value, M is the mass content of the effective CaO of current flux.
3. sintering circuit sinter quality control method according to claim 1, it is characterized in that the difference of the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate be 0.3% ~ 1% and the mean value of front four CaO mass content of the current C aO mass content > agglomerate of agglomerate time lower flux ratio, the difference of the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate be 0.3% ~ 1% and the mean value of front four CaO mass content of the current C aO mass content < agglomerate of agglomerate time raise flux ratio, the operation steps raising or lower flux ratio is:
First, within last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=CaO poor/(M × 0.8); Then, after last flux ratio adjustment two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio raising or lower be X=CaO poor/M;
Wherein, CaO difference is the difference of the mass content mean value of front four CaO of agglomerate current C aO mass content and agglomerate, and M is the mass content of the effective CaO of current flux.
4. sintering circuit sinter quality control method according to claim 1, when it is characterized in that granular mass content >=80% of granularity≤3mm in described lurid unslaked lime, according to the mass ratio 1:0.5 digestive organ assimilation of quicklime using of unslaked lime and water; In described lurid unslaked lime during the granular mass content < 80% of granularity≤3mm, according to the mass ratio 1:0.45 digestive organ assimilation of quicklime using of unslaked lime and water.
5. sintering circuit sinter quality control method according to claim 1, when it is characterized in that granular mass content >=80% of granularity≤3mm in the unslaked lime of described white, according to the mass ratio 1:0.65 digestive organ assimilation of quicklime using of unslaked lime and water; In the unslaked lime of described white during the granular mass content < 80% of granularity≤3mm, according to the mass ratio 1:0.75 digestive organ assimilation of quicklime using of unslaked lime and water.
6. sintering circuit sinter quality control method according to claim 1, it is characterized in that the CaO mass content of described Wingdale is 45 ~ 55%, the CaO mass content of rhombspar is 30 ~ 35%, the CaO mass content of unslaked lime is 75 ~ 85%, when needing in sintering process to adjust the flux ratio of follow-up batching after sample examination, being used alone Wingdale, being used alone rhombspar and being used alone unslaked lime to the mass ratio that flux ratio adjusts is 10:6:15 ~ 17.
7. sintering circuit sinter quality control method according to claim 1, it is characterized in that described unslaked lime is faint yellow and after digestion completely, gained white lime becomes grain slag shape, then in white lime, add the Wingdale of in mass 0.3 ~ 0.5% or add unslaked lime by the CaO mass content of Wingdale, rhombspar, unslaked lime than 10:6:15 ~ 17 and carry out Mass adjust-ment.
8. sintering circuit sinter quality control method according to claim 1, it is characterized in that returning in described sintering being generically and collectively referred to as cold returning with BF return fines, wherein, return quality and account for and coldly return 55 ~ 65% of quality in sintering, BF return fines quality accounts for coldly returns 35% ~ 45% of quality.
9. sintering circuit sinter quality control method according to claim 1, when it is characterized in that producing first grade agglomerate, described current sinter basicity lower than agglomerate target basicity-0.05 need raise flux ratio or higher than agglomerate target basicity+0.05 time need lower flux ratio, its operation steps adopts operation steps according to claim 1.
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| CN107130105B (en) * | 2016-02-29 | 2018-06-26 | 鞍钢股份有限公司 | A kind of method for improving sinter basicity coefficient of stabilization and its proportioner used |
| CN105861817B (en) * | 2016-05-18 | 2017-10-24 | 武汉钢铁有限公司 | A kind of method for studying flux distribution in sintered compound granulation |
| JP6519036B2 (en) * | 2016-12-16 | 2019-05-29 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| CN107419045A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | The recovery method and blast furnace dedusting ash agglomerated material of blast furnace dedusting ash |
| CN107703743B (en) * | 2017-09-15 | 2020-09-18 | 首钢京唐钢铁联合有限责任公司 | Automatic control method for alkalinity of sinter |
| CN108715929B (en) * | 2018-04-25 | 2020-01-24 | 山西建龙实业有限公司 | Method for quickly adjusting alkalinity waste products of sintered ores |
| CN110724813B (en) * | 2018-06-29 | 2021-02-19 | 宝山钢铁股份有限公司 | Online adjusting system and method for alkalinity of sinter |
| CN111235383B (en) * | 2019-12-30 | 2022-01-14 | 武钢资源集团乌龙泉矿业有限公司 | Method for producing sintered ore by adding and using low magnesium resource |
| CN112941307A (en) * | 2021-01-28 | 2021-06-11 | 山西太钢不锈钢股份有限公司 | Control method for stabilizing sintering process |
| CN116297349A (en) * | 2022-01-25 | 2023-06-23 | 虔东稀土集团股份有限公司 | Rare earth metal production on-line measuring system |
| CN114807596B (en) * | 2022-05-07 | 2023-11-07 | 北京首钢自动化信息技术有限公司 | Batching control method and device for ore heap |
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| CN103572043B (en) * | 2012-07-25 | 2016-12-07 | 上海梅山钢铁股份有限公司 | The production method of low basicity sinter |
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