CN104164558A - Sintered ore quality control method in sintering process - Google Patents
Sintered ore quality control method in sintering process Download PDFInfo
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- CN104164558A CN104164558A CN201410427967.8A CN201410427967A CN104164558A CN 104164558 A CN104164558 A CN 104164558A CN 201410427967 A CN201410427967 A CN 201410427967A CN 104164558 A CN104164558 A CN 104164558A
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Abstract
The invention discloses a sintered ore quality control method in a sintering process. The method comprises the following steps: regulating a fluxing agent ratio before sintering and in the sintering process, regulating the alkalinity of fly ash by using a fluxing agent, so that the alkalinity of the fly ash is the same as alkalinity of a target product sintered ore, controlling the amount of digestion water according to color and particle size of quick lime, and setting the cycle time of sintered internal return and blast furnace return ore; and periodically sampling and checking the alkalinity and content of SiO2 and CaO, calculating the fluxing agent ratio of subsequent ingredients needing to be increased or decreased, and adjusting the fluxing agent amount in the ingredients according to the ratio. According to the method, the influence of various ores on the sintered ore quality is greatly reduced, and the quality stability of the sintered ore is improved. Quantitative adjustment is performed through check and calculation of the components of the sintered ore, the anticipation ability of an operator is improved, the quality fluctuation tendency and amplitude are mastered, and the retardation time is greatly shortened and adjusted. Moreover, complex and troublesome ingredient calculation is simplified, and the method is easily mastered and operated by the operator.
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 further improves, the capacity factor of a blast furnace can be remained under higher level and operate, guarantee blast furnace production 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.Sinter quality is controlled the following objective restrict factor of ubiquity at present:
(1) eat " 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, the pressure that reduces costs to seek survival is more and more heavier, many steel mills all turn to " the various schools of thinkers ore deposit " that domestic price is relatively cheap, various schools of thinkers ore deposit refers to that the place of production is many, amount less, second-rate ore.As our factory is used " various schools of thinkers ore deposit " in a large number, it has the features such as many, the mutual component difference in the place of production is large, although process through first and second stock ground, mixes ore deposit fluctuation still larger.
(2) conventional sintering mineral amount control method is to adjust material proportion according to finished product agglomerate chemical examination composition, and it is very long retardation time that the method process quality is controlled adjustment.Because of technological reason, from feeding intake, produce long to going out the Sinter Component result of laboratory test time cycle, with our factory, 210m2 is sintered to example, 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 the about 1-2 hour of result, time lag about 4-5 hour, in daily production, the method can not meet needs of production, often causes Sinter Component fluctuation.
(3) according to crude fuel chemical examination composition, calculate ratio of components.Wide in variety because of crude fuel, and must consider the impact of sintering recycle while calculating, charge calculation is very complicated, easily makes mistakes; Because crude fuel is wide in variety, treatment capacity is large, each crude fuel sample representation is poor simultaneously, and deviation appears in the inaccurate calculation result that all can cause of individual other style, and then causes Sinter Component fluctuation.
Therefore, need badly a kind of simple working method is provided, to combine according to the method for agglomerate chemical examination composition adjustment and the method for calculating according to crude fuel composition, " thereby stable operation ", improve operator " anticipation power ", accurately grasp quality fluctuation trend and amplitude, shorten " hysteresis " time, improve sinter quality.
Summary of the invention
The present invention has overcome 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 operator's anticipation power, shorten retardation time, improve sinter quality.
For solving above-mentioned technical problem, one embodiment of the present invention by the following technical solutions:
A sintering circuit sinter quality control method, it comprises:
A, start sintering before and take in Wingdale, rhombspar and unslaked lime while preparing burden in sintering process at least one be flux;
Before B, beginning sintering and while preparing burden in sintering process, sample the SiO that detects dedusting ash
2content and CaO content, and regulate the basicity of dedusting ash to make it identical with the basicity of object product agglomerate with the flux described in steps A;
C, comprise unslaked lime and unslaked lime is light yellow when the flux using, according to the mass ratio 1:0.45～0.5 digestive organ assimilation of quicklime using of unslaked lime and water; When the flux using 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;
Be 3～4 hours the cycling time of returning in sintering in D, sintering process, and be 7～8 hours the cycling time of BF return fines;
In E, sintering process, regularly sample ore is carried out to sample examination and obtain SiO
2, CaO content and sinter basicity, as the 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%, basicity be need to be 0.3%～1% according to the difference that blast furnace requires to adjust 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 time, with at least one in Wingdale, rhombspar and unslaked lime, regulates the basicity of agglomerate.
Sintering is a continuously technique, in sintering process, constantly prepare burden and regulate in time agglomerate SiO according to raw material and fuel quality situation
2content, CaO content and basicity, guarantee 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 occurring adjusting the situation of flux ratio, just raise or lower the flux ratio in follow-up batching, and rise is basicity, the SiO for the follow-up sintering ore deposit that raises
2mass content and CaO mass content, downward is in order to reduce follow-up high sinter basicity, SiO
2mass content and CaO mass content, final object is all basicity, the SiO that makes agglomerate
2mass content and the fluctuation of CaO mass content are in normal range.
According to one embodiment of the present invention, described basicity need to require to adjust according to blast furnace and refer to according to blast furnace slag making and need to determine to raise or downward agglomerate target basicity; 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 in current sinter basicity > agglomerate target basicity+0.1 o'clock, flux ratio is raised in current sinter basicity < agglomerate target basicity-0.1 o'clock, and the operation steps that raises or lower flux ratio is:
First, within last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=R poor * S/ (M * 0.8);
Then, after last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises 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
2during the mean value of mass content, lower flux ratio, 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
2during the mean value of mass content, raise flux ratio, the operation steps that raises or lower flux ratio is:
First, within last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=S poor * R/ (M * 0.8);
Then, after last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=S poor * R/M;
Wherein, R is agglomerate target basicity, and S difference is the current SiO of agglomerate
2front four SiO of mass content and 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 is 0.3%～1% and lowers flux ratio during the mean value of front four CaO mass content of the current C aO mass content > agglomerate of agglomerate, the difference of the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate is 0.3%～1% and raises flux ratio during the mean value of front four CaO mass content of the current C aO mass content < agglomerate of agglomerate, the operation steps that raises or lower flux ratio is:
First, within last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=CaO poor/(M * 0.8);
Then, after last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=CaO poor/M;
Wherein, CaO difference is the difference of the mass content mean value of agglomerate current C aO mass content and front four CaO of agglomerate, and M is the mass content of the effective CaO of current flux.
The working method that regulates flux ratio under above-mentioned three kinds of different situations is to occur when abnormal at Sinter Component, flux ratio to follow-up batching is adjusted, during adjustment, the average CaO of four sintering sample ores, the foundation of SiO2 content for calculating before wanting, in sintering process, constantly at sample examination, the average CaO of front four sintering sample ores, SiO2 content can calculate in the past data of 4 times." last flux ratio adjust " refers to this calculating in sintering process and the front flux ratio adjustment of adjustment." within last flux ratio is adjusted two and one-half-hours " belongs to larger adjustment to the adjustment of flux ratio, and the adjustment of " after last flux ratio is adjusted 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 guarantees 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%, while needing the flux ratio of follow-up batching to adjust in sintering process after sample examination, the mass ratio that use separately Wingdale, uses rhombspar and use separately unslaked lime to adjust flux ratio is separately 10:6:15～17.For example after certain chemical examination, need to add the Wingdale of 10 parts to adjust flux ratio, so Wingdale being changed into unslaked lime needs 15～17 parts.
Further technical scheme is: described unslaked lime be faint yellow and digestion completely after gained white lime become grain slag shape, to adding in mass 0.3～0.5% Wingdale in white lime or adding unslaked lime to carry out quality adjustment by the mass content of Wingdale, rhombspar, unslaked lime than 10:6:15～17.Flaxen Lime Quality is poor, if digested according to predefined water consumption, easily becomes grain slag shape after digestion, at this moment needs to increase the consumption of Wingdale or unslaked lime, adjusts the state of white lime.
Further technical scheme is: in described sintering, return with BF return fines and be generically and collectively referred to as cold returning, wherein, return quality and account for cold 55～65% of the quality of returning in sintering, BF return fines quality accounts for cold 35%～45% of the quality of returning.
While producing first grade agglomerate, described current sinter basicity needs raise flux ratio or need lower flux ratio higher than agglomerate target basicity+0.05 o'clock lower than agglomerate target basicity-0.05, and its operation steps adopts operation steps claimed in claim 2.
Compared with prior art, one of beneficial effect of the present invention is: (1) has greatly reduced " various schools of thinkers ore deposit " impact on sinter quality, has improved the stability of sinter quality; (2) by Sinter Component, chemically examine and quantitative adjusting is carried out in calculating, improved operator's " anticipation power ", grasp quality fluctuation trend and amplitude, greatly shorten the time of adjusting " hysteresis "; (3) complicated, loaded down with trivial details charge calculation is 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 timely and accurately raw material, fuel ratio.
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 clearer, 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, is not intended to limit the present invention.
At quality control procedure, can relate to the adjustment of sinter basicity (R), sinter basicity is that the basicity of slag of stipulating during according to blast-furnace smelting is determined, and the basicity of slag of blast furnace depends primarily on the basicity of feed stock for blast furnace, therefore, enter under the condition of stove at single agglomerate, the basicity of slag depends on the basicity of agglomerate, because basicity of slag requires necessarily, so the basicity of agglomerate also should be certain.
Fig. 1 is the master operation schema of sintering circuit, the first step of sintering circuit is to prepare 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 starts to continue up to sintering circuit from sintering circuit and finishes.Flux ratio is the first step during sintering quality is controlled, 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%, while needing the flux ratio of follow-up batching to adjust in sintering process after sample examination, the mass ratio that use separately Wingdale, uses rhombspar and use separately unslaked lime to adjust flux ratio is separately 10:6:15～17; Return mine and be cold returning, cold returning comprises in sintering and returning and BF return fines, in sintering circuit, be 3～4 hours the cycling time of returning in sintering, be 7～8 hours the cycling time of BF return fines, returns quality and account for cold 55～65% of the quality of returning in sintering, and BF return fines quality accounts for cold 35%～45% of the quality of returning, the cold quality of returning and consumption are larger on SINTERING PRODUCTION impact, return middle CaO, SiO although cold
2content and Sinter Component are basic identical, but also will consider the cold cycling time of returning when sinter basicity R is adjusted in sintering circuit; The sintering circuit initial stage, while preparing burden, also will sample the SiO that detects dedusting ash
2content and CaO content, generally, dedusting ash is compared with Sinter Component, its SiO
2content is relatively higher, CaO content is relatively on the low side, therefore before using dedusting ash, need regulate the CaO content in dedusting ash to make it identical with the basicity of object product agglomerate with flux, generally the mass content of the unslaked lime in flux be improved to 0.1～0.3% and just can reach adjusting object.If flux has been used unslaked lime, after batching, to use digestive organ assimilation of quicklime using so, the mass discrepancy of unslaked lime can have a great impact later stage sintering process, therefore need 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, unslaked lime with the optimum quality of water than being 1:0.5; In lurid unslaked lime during the granular mass content < 80% of granularity≤3mm, unslaked lime with the optimum quality of water 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, unslaked lime with the optimum quality of water than being 1:0.65; In the unslaked lime of white during the granular mass content < 80% of granularity≤3mm, unslaked lime with the optimum quality of water than being 1:0.75.After unslaked lime complete digestion, obtain white lime, if unslaked lime is that in light yellow or digestive process, steam is few, form becomes grain slag shape, should in liming, add the Wingdale of mass content 0.3～0.5% or the content that appropriate unslaked lime is adjusted CaO, the effective CaO that solution causes due to Lime Quality difference and digestible degree difference is containing quantity not sufficient or unstable, if while adopting interpolation unslaked lime to adjust, notice that the amount that unslaked lime adds can not be too much, meet independent use Wingdale, the mass ratio that uses rhombspar separately and use unslaked lime to adjust flux ratio is separately 10:6:15～17.After having prepared burden one is mixed, two is mixed, cloth and sintering process are conventional sintering circuit steps, heat after sintering starts is broken, bulk cargo, main electric precipitation and encircle cold, multi-stage screenings etc. are indispensable steps in sintering circuit, and after sintering circuit starts, must regularly to the composition of agglomerate, chemically examine, therefore need to be in sintering process regular sample examination, such as in whole sintering process, within every two hours, carry out sample examination, after each chemical examination, according to chemical examination acquired results, agglomerate is carried out to an inferior quality adjustment, by certain one-tenth in adjustment flux, assign to regulate the basicity of all agglomerate, SiO
2content, CaO content etc.In sintering process, conventionally have four kinds of situations need to regulate flux ratio: the one, agglomerate object product changes, agglomerate target basicity need to require to adjust to adapt to new object product according to blast furnace, the 2nd, the fluctuation range of current sinter basicity exceeds the scope of required basicity value ± 0.1 of production object product agglomerate, and the 3rd, the 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%, the 4th, the difference 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 of different abnormal conditions, three kinds of different method of calculation are provided, can calculate fast need to be to the flux ratio of adding in agglomerate, the flux ratio of the rise of for example calculating is 1%, and the flux mass content that sintering adds while starting is 5%, after current flux ratio is adjusted, the flux total mass content of interpolation is 6% so.While adjusting according to the flux ratio of calculating, conventionally adopt Wingdale or unslaked lime to adjust, in rhombspar, contain more magnesiumcarbonate, 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 surpass 0.5% or the difference of the mean value of the current C aO mass content of agglomerate and front four CaO mass content of agglomerate over 1%, for fluctuation is abnormal, need resample and chemically examine because fluctuation extremely normally because finished product agglomerate sampling is improper, significant change appears in raw material and fuel quality (as stock yard heap batching goes wrong, batch mixing etc.) cause.
Below by specific embodiment, illustrate according to result of laboratory test and occur the quality controlling means that different sinter qualities should adopt while fluctuating, especially need the method for calculation of the flux ratio of interpolation.
Embodiment 1
A, the total material loading amount of sintering 400t, it is joined the 160t that always returns mine, fuel 12t, Wingdale 12t, rhombspar 7.2t, unslaked lime 14.4t at home and abroad, mixes ore deposit 194.4t, dedusting ash 10t, Wingdale the active calcium ion content 45%, unslaked lime the active calcium ion content 75%, rhombspar the active calcium ion content 35%, it is 2 that object product agglomerate requires R.
When B, batching, the CaO mass ratio of Wingdale, rhombspar, unslaked lime is 10:6:15, as adjusted basicity, need raise unslaked lime amount 1t, by adjusting Wingdale, needs 1.5t, as adjusted rhombspar, 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, with require to compare low by 0.2, therefore need to flux, regulate the CaO content of dedusting ash, need to increase amount of lime 0.24t, as increased unslaked lime, need 0.16t, use rhombspar to need 0.4t, the R of the now R of dedusting ash and agglomerate requirement is identical or difference is very little.
D, the rear digestive organ assimilation of quicklime using of using of having prepared burden, it is light yellow observing unslaked lime color, and in unslaked lime, the particle of particle diameter≤3mm accounts for more than 80% (approximately 85%), so the consumption of water is 7.2t, is just in time half of Lime Quality.
After E, sintering start, return approximately 3 hours cycling time in sintering, approximately 8 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 55% of the cold total amount of returning mine, is 88t, and BF return fines amount accounts for cold 45% of the total amount of returning, and is 72t.
After F, sintering start, in whole flow process, need sample ore to chemically examine sampling in every two hours, SiO in chemical examination agglomerate
2, CaO content and sinter basicity; Result of laboratory test is: SiO
2content 6%, CaO content 11.4%, sinter basicity is 1.9, the R requiring compared with object product agglomerate is low by 0.1, therefore sinter basicity need to be adjusted to 2 from 1.9, first within once flux ratio is adjusted two and one-half-hours, in agglomerate, add unslaked lime, 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 is adjusted two and one-half-hours, in agglomerate, add unslaked lime, 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; Here said last flux ratio is adjusted, and all refers to the adjustment of after last sample examination, agglomerate being carried out.
Embodiment 2
A, the total material loading amount of sintering 400t, it is joined the 160t that always returns mine, fuel 12t, rhombspar 7.2t, Wingdale 12t, unslaked lime 14.4t at home and abroad, mixes ore deposit 194.4t, dedusting ash 10t, the R that object product agglomerate 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, as adjusted basicity, need raise unslaked lime amount 1t, by adjusting Wingdale, needs 1.7t, as adjusted rhombspar, 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, with require to compare low by 0.2, therefore need to flux, regulate the CaO content of dedusting ash, need to increase amount of lime 0.24t, as increased unslaked lime, need 0.14t, use rhombspar to need 0.4t, the R of the now R of dedusting ash and agglomerate requirement is identical or difference is very little.
D, the rear digestive organ assimilation of quicklime using of using of having prepared burden, it be white observing unslaked lime color, and in unslaked lime, the granule content of particle diameter≤3mm is less than 80% (approximately 68%), so the consumption of water is 10.8t, is just in time 0.75 times of Lime Quality.
After E, sintering start, return approximately 4 hours cycling time in sintering, approximately 7 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 65% of the cold total amount of returning mine, is 104t, and BF return fines amount accounts for cold 35% of the total amount of returning, and is 56t.
After F, sintering start, in whole flow process, need sample ore to chemically examine sampling in every two hours, SiO in chemical examination agglomerate
2, CaO content and sinter basicity; Front four average SiO of sample
2content is that 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, this result of laboratory test and front four result of laboratory test comparisons, SiO
2content fluctuation is larger, current SiO
2front four the sample SiO of content and agglomerate
2difference>=0.2% of content mean value, therefore need to lower flux ratio, select to lower Wingdale ratio, within last flux ratio is adjusted two and one-half-hours, Wingdale downward ratio is (6.1%-5.8%) * 2/ (50% * 0.8)=1.5%, i.e. (400-160) * 1.5%=3.6t, Wingdale is increased to 8.4t (=12-3.6) with addition of amount; Then after last flux ratio is adjusted two and one-half-hours, adjust back, resize ratio is (6.1%-5.8%) * 2/50%=1.2%, i.e. (400-160) * 1.2%=2.88t, and Wingdale pulls back to 9.12t (=12-2.88) with addition of amount.
Embodiment 3
A, the total material loading amount of sintering 400t, it is joined the 160t that always returns mine, fuel 12t, rhombspar 7.2t, Wingdale 12t, unslaked lime 14.4t at home and abroad, mixes ore deposit 194.4t, dedusting ash 10t, 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, as adjusted basicity, need raise unslaked lime amount 1t, by adjusting Wingdale, needs 1.6t, as adjusted rhombspar, 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, with require to compare low by 0.2, therefore need to flux, regulate the CaO content of dedusting ash, need to increase amount of lime 0.24t, as increased unslaked lime, need 0.15t, use rhombspar to need 0.4t, the R of the now R of dedusting ash and agglomerate requirement is identical or difference is very little.
D, the rear digestive organ assimilation of quicklime using of using of having prepared burden, it be white observing unslaked lime color, and in unslaked lime, the particle of particle diameter≤3mm accounts for more than 80% (approximately 90%), so the consumption of water is 9.36t, is just in time 0.65 times of Lime Quality.
After E, sintering start, return approximately 3 hours cycling time in sintering, approximately 8 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 60% of the cold total amount of returning mine, is 96t, and BF return fines amount accounts for cold 40% of the total amount of returning, and is 64t.
After F, sintering start, in whole flow process, need sample ore to chemically examine sampling in every two hours, SiO in chemical examination agglomerate
2, CaO content and sinter basicity, front four average SiO of sample
2content is that 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 result of laboratory test comparisons, the fluctuation of CaO content is larger, difference>=0.3% of front four the sample CaO content mean values of current C aO content and agglomerate, therefore need to lower flux ratio, select to lower Wingdale and unslaked lime ratio simultaneously, within last flux ratio is adjusted 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, Wingdale downward 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 after last flux ratio is adjusted two and one-half-hours, adjust back, 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, the rear digestive organ assimilation of quicklime using of using of having prepared burden, it is light yellow observing unslaked lime color, and in unslaked lime, the particle of granularity≤3mm is less than 80% (approximately 78%), so 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, in white lime, adds the Wingdale of 0.065t in mass to carry out quality adjustment.
After E, sintering start, return approximately 3 hours cycling time in sintering, approximately 8 hours cycling time of BF return fines, in sintering, the amount of returning accounts for 60% of the cold total amount of returning mine, is 96t, and BF return fines amount accounts for cold 40% of the total amount of returning, and is 64t.
After F, sintering start, in whole flow process, need sample ore to chemically examine sampling in every two hours, SiO in chemical examination agglomerate
2, CaO content and sinter basicity; Front four average SiO of sample
2content is that 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 according to the step shown in embodiment 3, calculates and adjusts.
This working method was promoted in 105 sintering mill (plant)s in March, 2011, it is good that production line operator react, and be applied in 210 sintered material programdesigns when the end of the year, make 210 batching Operational System Controls more simple and direct, convenient, most of concrete calculating, by replacements such as computer, programs, has improved the accuracy of batching greatly, has reduced computing time, greatly alleviate batching operator's labour intensity, be conducive to improve the stability of sinter quality.In February, 2012, this methodology was just popularized in an all-round way in 210 sintering mill (plant)s, has obtained good effect between 210 sintering trial production periods, and within 2013,210 sintering quality particular cases are as follows:
(1) agglomerate comprehensive qualified rate, the ratio of first-grade products, FeO index of stability progressively improve
Table 1:210 sintering is main quality index performance in recent years
Table 2:2013 periphery in the May colleague sintering R of producer index of stability performance
By table 1, table 2, can find out that the main quality index of our factory in 2013 all rises more, and the producer that more national particularly periphery is former, fuel is close, sinter quality stability has kept better level.
(2) substantially stop quality accident.Along with these Manipulative promotion and application, agglomerate continuously low useless, high useless phenomenon obviously reduces, within 2013, continuous two samples of annual 210 sintering are low useless or high useless only 4 times, compared with obviously reducing for monthly 2-3 time former years, and quality accident together (continuous three waste products) do not occur.
(3) easy, practical, workable.After this methodology is applied in 210 sintered material system designs and production practice, make complexity, loaded down with trivial details charge calculation become easy, practical, worker is easy to grasp and operation, labour intensity reduces greatly, on to the analysis of basicity, judgement and adjustment, precision, rapid property are largely increased, and have effectively reduced the disadvantageous effect that " hysteresis " phenomenon is brought.
Although with reference to a plurality of 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 modification and embodiments, and these are revised and within embodiment will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to the building block of subject combination layout and/or layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.
Claims (10)
1. a sintering circuit sinter quality control method, is characterized in that it comprises the following steps:
A, start sintering before and take in Wingdale, rhombspar and unslaked lime while preparing burden in sintering process at least one be flux;
Before B, beginning sintering and while preparing burden in sintering process, sample the SiO that detects dedusting ash
2content and CaO content, and regulate the basicity of dedusting ash to make it identical with the basicity of object product agglomerate with the flux described in steps A;
C, comprise unslaked lime and unslaked lime is light yellow when the flux using, according to the mass ratio 1:0.45～0.5 digestive organ assimilation of quicklime using of unslaked lime and water; When the flux using 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;
Be 3～4 hours the cycling time of returning in sintering in D, sintering process, and be 7～8 hours the cycling time of BF return fines;
In E, sintering process, regularly sample ore is carried out to sample examination and obtain SiO
2, CaO content and sinter basicity, as the 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%, basicity be need to be 0.3%～1% according to the difference that blast furnace requires to adjust 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 time, with at least one in Wingdale, rhombspar and unslaked lime, regulates the basicity of agglomerate.
2. sintering circuit sinter quality control method according to claim 1, is characterized in that described basicity need to adjust and refer to according to blast furnace slag making and need to determine to raise or lower agglomerate target basicity according to blast furnace requirement; 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 in current sinter basicity > agglomerate target basicity+0.1 o'clock, flux ratio is raised in current sinter basicity < agglomerate target basicity-0.1 o'clock, and the operation steps that raises or lower flux ratio is:
First, within last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=R poor * S/ (M * 0.8); Then, after last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises 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.
3. 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
2during the mean value of mass content, lower flux ratio, 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
2during the mean value of mass content, raise flux ratio, the operation steps that raises or lower flux ratio is:
First, within last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=S poor * R/ (M * 0.8); Then, after last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=S poor * R/M;
Wherein, R is agglomerate target basicity, and S difference is the current SiO of agglomerate
2front four SiO of mass content and agglomerate
2the difference of mass content mean value, M is the mass content of the effective CaO of current flux.
4. sintering circuit sinter quality control method according to claim 1, the difference that it is characterized in that the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate is 0.3%～1% and lowers flux ratio during the mean value of front four CaO mass content of the current C aO mass content > agglomerate of agglomerate, the difference of the mean value of the current C aO mass content of described agglomerate and front four CaO mass content of agglomerate is 0.3%～1% and raises flux ratio during the mean value of front four CaO mass content of the current C aO mass content < agglomerate of agglomerate, the operation steps that raises or lower flux ratio is:
First, within last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=CaO poor/(M * 0.8); Then, after last flux ratio is adjusted two and one-half-hours, raise or lower the flux consumption in batching follow-up in sintering process, the flux ratio that raises or lower be X=CaO poor/M;
Wherein, CaO difference is the difference of the mass content mean value of agglomerate current C aO mass content and front four CaO of agglomerate, and M is the mass content of the effective CaO of current flux.
5. sintering circuit sinter quality control method according to claim 1, while 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.
6. sintering circuit sinter quality control method according to claim 1, while 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.
7. sintering circuit sinter quality control method according to claim 1, the CaO mass content that it is characterized in that described Wingdale is 45～55%, the CaO mass content of rhombspar is 30～35%, the CaO mass content of unslaked lime is 75～85%, while needing the flux ratio of follow-up batching to adjust in sintering process after sample examination, the mass ratio that use separately Wingdale, uses rhombspar and use separately unslaked lime to adjust flux ratio is separately 10:6:15～17.
8. sintering circuit sinter quality control method according to claim 1, it is characterized in that described unslaked lime be faint yellow and digestion completely after gained white lime become grain slag shape, to adding in mass 0.3～0.5% Wingdale in white lime or adding unslaked lime to carry out quality adjustment by the CaO mass content of Wingdale, rhombspar, unslaked lime than 10:6:15～17.
9. sintering circuit sinter quality control method according to claim 1, it is characterized in that returning with BF return fines and being generically and collectively referred to as cold returning in described sintering, wherein, return quality and account for cold 55～65% of the quality of returning in sintering, BF return fines quality accounts for cold 35%～45% of the quality of returning.
10. sintering circuit sinter quality control method according to claim 1, while it is characterized in that producing first grade agglomerate, described current sinter basicity needs raise flux ratio or need lower flux ratio higher than agglomerate target basicity+0.05 o'clock lower than agglomerate target basicity-0.05, and its operation steps adopts operation steps claimed in claim 2.
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| CN111235383A (en) * | 2019-12-30 | 2020-06-05 | 武钢资源集团有限公司 | Method for producing sintered ore by adding and using low magnesium resource |
| 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 |
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