CN114703364B - Method for producing sinter by high-proportion FB powder - Google Patents
Method for producing sinter by high-proportion FB powder Download PDFInfo
- Publication number
- CN114703364B CN114703364B CN202210459662.XA CN202210459662A CN114703364B CN 114703364 B CN114703364 B CN 114703364B CN 202210459662 A CN202210459662 A CN 202210459662A CN 114703364 B CN114703364 B CN 114703364B
- Authority
- CN
- China
- Prior art keywords
- powder
- percent
- equal
- less
- proportion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000843 powder Substances 0.000 title claims abstract description 120
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 72
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 14
- 239000012141 concentrate Substances 0.000 claims abstract description 14
- 239000004571 lime Substances 0.000 claims abstract description 14
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 11
- 239000010459 dolomite Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 32
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 23
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 17
- 239000002994 raw material Substances 0.000 claims description 12
- 230000035699 permeability Effects 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 13
- 239000000446 fuel Substances 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 6
- 230000004907 flux Effects 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 3
- 239000000395 magnesium oxide Substances 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 235000012054 meals Nutrition 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The application provides a method for producing sinter by high-proportion FB powder, which comprises the following steps: 15 to 23 percent of Brazil coarse powder, 10 to 15 percent of PB powder, 35 to 45 percent of FB powder, 4.5 to 5.0 percent of coke powder, 5 to 6 percent of lime powder, 7 to 8 percent of raw dolomite powder and the balance of domestic iron concentrate powder, and adaptively optimize the process steps and the process parameters, thereby successfully improving the proportion of the FB powder to 35 to 45 percent, solving the problem that more heat is required for sintering due to higher crystallization water content in the FB powder, solving the problems that the increase of the FB powder can cause the increase of the porosity of the sinter, the decrease of the strength of the rotary drum, the increase of the return rate in sintering and the like, controlling the granularity of the rotary drum to more than 76 percent and 0 to 5mm to be within 6 percent; can control the grade and Al of the sinter 2 O 3 The content is in a reasonable range, reduces the dosage of magnesia flux and reduces the fuel consumption of the blast furnace.
Description
Technical Field
The invention relates to the technical field of sinter, in particular to a method for producing sinter by high-proportion FB powder.
Background
The sintering is to mix and granulate iron ore powder, various fluxing agents and fine coke, then add the mixture into a sintering machine through a material distribution system, ignite the fine coke through an ignition furnace, complete sintering reaction through air suction of an air suction fan, crush, cool and screen the sintered ore, and send the crushed sintered ore to a blast furnace to be used as a main raw material for smelting molten iron. The sintering raw materials comprise various iron-rich mineral powder, coke powder, dust of steel works, powdery iron-containing waste materials and the like, the concentrate is not suitable to be too fine, and the proportion of-200 meshes is generally less than 80 percent.
At present, non-mainstream low-grade mineral powder resources generally have the characteristics of high silicon and high aluminum, and a large amount of magnesia fluxes are generally required to be matched for ensuring the smelting and blast furnace slag performances, so that the grade of the sintered ore is reduced, the comprehensive charging grade of the blast furnace is further reduced, the yield is reduced, the fuel consumption is increased, the waste of resources and the increase of the cost are caused, and the national development trend of low carbon and environmental protection is not met. FB powder as non-main stream low grade resource, al thereof 2 O 3 The content is about 2.5 percent, siO 2 The content is about 5.4%, the large amount of the mixture does not cause the large increase of the silicon and aluminum content in the sinter, the cost performance is remarkable, and the proportion of the mixture for domestic enterprises is basically controlled within 20%.
The following problems exist in the process of compounding the FB powder: 1) The content of crystal water in the FB powder is higher, and more heat is needed in the sintering process; 2) According to the prior use experience, with the increase of the proportion of the FB powder, the porosity of the sinter is increased, and further the problems of the decrease of the strength of the rotary drum, the increase of the sintering internal return rate and the like are caused.
Therefore, how to make technical breakthroughs, the FB powder is matched in a high proportion, key technological parameter control of sintering is studied in an important way, the quality of the sintered ore is ensured to meet the requirement of blast furnace production, and the technical problem which is needed to be solved by the technicians in the field is solved.
Disclosure of Invention
The invention aims to provide a method for producing sinter by high-proportion FB powder.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for producing sinter by high proportion of FB powder comprises the following steps in sequence:
1) And (3) batching: the mixture ratio of the raw materials is as follows: 15 to 23 percent of Brazil coarse powder, 10 to 15 percent of PB powder, 35 to 45 percent of FB powder, 4.5 to 5.0 percent of coke powder, 5 to 6 percent of lime powder, 7 to 8 percent of raw dolomite powder and the balance of domestic iron concentrate powder;
2) Mixing: mixing the raw materials in the step 1), and obtaining a mixture after the mixing is completed, wherein the water content in the mixture is controlled according to 7.1% -7.3%;
3) Sintering: sequentially distributing, igniting and sintering the mixture obtained in the step 2);
the thickness of the material layer of the cloth is increased to 825mm-835mm, and the air permeability of the material layer is inhibited through material pressing operation;
the ignition temperature is increased to 1130-1150 ℃;
after sintering is completed, obtaining sintered ore, and controlling SiO in the sintered ore 2 The content is 5.4-5.7%, and the FeO content in the sinter is increased to 8-9%;
4) And (3) crushing, cooling and screening the obtained sinter in the step (3) to obtain the finished sinter.
Preferably, in step 1), the components of the domestic fine iron powder: TFe:64.0% -66.0% of SiO 2 ：6.5%-7.5%、Al 2 O 3 :0.40% -0.45%, P:0.035% -0.040%, S:0.145% -0.150%, caO:0.60% -0.70%, mgO:1.30% -1.40%, water: 9.70% -9.80%;
the components of Brazil coarse powder: TFe:62.0% -63.0% of SiO 2 ：4.50%-4.60%、Al 2 O 3 :1.50% -1.60%, P:0.070% -0.080%, S:0.010% -0.020%, mnO:0.25% -0.35%, moisture: 8% -9% of burning loss: 3.6% -3.7%;
the PB powder comprises the following components: TFe:61.0% -62.0% of SiO 2 ：3.6%-3.7%、Al 2 O 3 :2.1% -2.2%, P:0.10% -0.20%, S:0.02% -0.03%, mnO:0.15% -0.20%, moisture: 9.50% -9.60%, burn-out: 6.0% -6.1%;
the components of the FB powder are as follows: TFe:58.0% -60.0% of SiO 2 ：5.5%-6.0%、Al 2 O 3 :2.40% -2.70%, P:0.09% -0.10%, S:0.060% -0.070%, mnO:0.60% -0.70%, moisture: 8.30% -8.50%, burning loss: 7.40% -7.60%.
Preferably, in step 1), the domestic fine iron powder has a particle size of: the proportion of less than or equal to 0.074mm is more than or equal to 75 percent;
the particle size of Brazil coarse powder is: the proportion of less than or equal to 1mm is less than or equal to 15.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the particle size of PB powder is: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 10.0 percent, and the proportion of more than 10mm is less than or equal to 5 percent;
the particle size of the FB powder is as follows: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the granularity of the coke powder is as follows: the proportion of less than or equal to 20mm is more than or equal to 95 percent, and the proportion of less than or equal to 1mm is not more than 30 percent;
the granularity of the lime powder is as follows: less than or equal to 3mm and less than or equal to 90 percent and less than or equal to 5mm;
the particle size of the raw dolomite powder is as follows: less than or equal to 3mm and less than or equal to 85 percent and less than or equal to 5mm.
Preferably, in step 3), the sintering temperature is controlled in the range of 1250 ℃ to 1280 ℃ and the final temperature is controlled at the penultimate or third windbox of the tail, wherein 240m 2 The final temperature of the sintering machine is controlled to be not lower than 450 ℃ and 265m 2 The end temperature of the sintering machine is controlled to be not lower than 420 ℃, the machine speed of the sintering machine is controlled to be more than 1.4m/s, and the vertical sintering speed is controlled to be 14.5-15.5 mm/min.
Preferably, in step 3), 240m 2 The negative pressure of the sintering machine is controlled to be not lower than 13.5kPa,265m 2 The negative pressure of the sintering machine is controlled to be not lower than 15.5 kPa.
Preferably, in step 4), the components of the finished sinter are: TFe:55% -58% of SiO 2 ：5.4%-5.7%、Al 2 O 3 ：2.30%-2.70%、P：0.040%-0.070%、S：0.010%-0.030%、MnO：0.40%-0.60%；
The drum strength of the finished sinter is 76-78%, and the alkalinity of the sinter is controlled according to 1.8.
The application achieves the following beneficial technical effects:
1) In the application, the proportion of the FB powder is increased to 35% -45% in the ingredients, and the method can control the grade and Al of the sinter after the FB powder is used in a large proportion 2 O 3 The content is in a reasonable range, so that the matching of magnesia flux is reduced, the quality of the sinter is prevented from sliding downwards, the comprehensive charging grade of the blast furnace is prevented from being reduced, the fuel consumption of the blast furnace is effectively reduced, and the energy consumption of the blast furnace process is effectively reduced while the low-cost production is maintained.
2) In this application, successfully improve the ratio of FB powder to 35% -45% and become reality, and solved the higher problem that leads to the sintering process needs more heat of crystallization water content in the FB powder, solved the increase of FB powder ratio and can cause the porosity increase of sinter and then cause the problem such as rotary drum intensity decline, sintering internal return rate rise, the rotary drum intensity of the sinter of finished product reaches more than 76%, 0-5mm granularity control is within 6%, the quality of sinter can satisfy the demand of blast furnace production.
3) In the method, the fuel consumption of the sinter is controlled within 1kg/t, the ton iron is reduced by more than 20 yuan, the production cost is reduced on the basis of green environmental protection, and the social resource is saved.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The application provides a method for producing sinter by high-proportion FB powder, which comprises the following steps in sequence:
1) And (3) batching: the mixture ratio of the raw materials is as follows: 15 to 23 percent of Brazil coarse powder, 10 to 15 percent of PB powder, 35 to 45 percent of FB powder, 4.5 to 5.0 percent of coke powder, 5 to 6 percent of lime powder, 7 to 8 percent of raw dolomite powder and the balance of domestic iron concentrate powder;
2) Mixing: mixing the raw materials in the step 1), and obtaining a mixture after the mixing is completed, wherein the water content in the mixture is controlled according to 7.1% -7.3%;
3) Sintering: sequentially distributing, igniting and sintering the mixture obtained in the step 2);
the thickness of the material layer of the cloth is increased to 825mm-835mm, and the air permeability of the material layer is inhibited through material pressing operation;
the ignition temperature is increased to 1130-1150 ℃;
after sintering is completed, obtaining sintered ore, and controlling SiO in the sintered ore 2 The content is 5.4-5.7%, and the FeO content in the sinter is increased to 8-9%;
4) And (3) crushing, cooling and screening the obtained sinter in the step (3) to obtain the finished sinter.
In one embodiment of the present application, in step 1), the composition of the domestic fine iron powder: TFe:64.0% -66.0% of SiO 2 ：6.5%-7.5%、Al 2 O 3 :0.40% -0.45%, P:0.035% -0.040%, S:0.145% -0.150%, caO:0.60% -0.70%, mgO:1.30% -1.40%, water: 9.70% -9.80%;
the components of Brazil coarse powder: TFe:62.0% -63.0% of SiO 2 ：4.50%-4.60%、Al 2 O 3 :1.50% -1.60%, P:0.070% -0.080%, S:0.010% -0.020%, mnO:0.25% -0.35%, moisture: 8% -9% of burning loss: 3.6% -3.7%;
the PB powder comprises the following components: TFe:61.0% -62.0% of SiO 2 ：3.6%-3.7%、Al 2 O 3 :2.1% -2.2%, P:0.10% -0.20%, S:0.02% -0.03%, mnO:0.15% -0.20%, moisture: 9.50% -9.60%, burn-out: 6.0% -6.1%;
the components of the FB powder are as follows: TFe:58.0% -60.0% of SiO 2 ：5.5%-6.0%、Al 2 O 3 :2.40% -2.70%, P:0.09% -0.10%, S:0.060% -0.070%, mnO:0.60% -0.70%, moisture: 8.30% -8.50%, burning loss: 7.40% -7.60%.
In one embodiment of the present application, in step 1), the domestic fine iron powder has a particle size of: the proportion of less than or equal to 0.074mm is more than or equal to 75 percent;
the particle size of Brazil coarse powder is: the proportion of less than or equal to 1mm is less than or equal to 15.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the particle size of PB powder is: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 10.0 percent, and the proportion of more than 10mm is less than or equal to 5 percent;
the particle size of the FB powder is as follows: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the granularity of the coke powder is as follows: the proportion of less than or equal to 20mm is more than or equal to 95 percent, and the proportion of less than or equal to 1mm is not more than 30 percent;
the granularity of the lime powder is as follows: less than or equal to 3mm and less than or equal to 90 percent and less than or equal to 5mm;
the particle size of the raw dolomite powder is as follows: less than or equal to 3mm and less than or equal to 85 percent and less than or equal to 5mm.
In one embodiment of the present application, in step 3), the sintering temperature is controlled in accordance with 1250 ℃ to 1280 ℃, the end point temperature is controlled at the penultimate or third windbox of the tail, 240m 2 The final temperature of the sintering machine is controlled to be not lower than 450 ℃ and 265m 2 The end temperature of the sintering machine is controlled to be not lower than 420 ℃, the machine speed of the sintering machine is controlled to be more than 1.4m/s, and the vertical sintering speed is controlled to be 14.5-15.5 mm/min.
In one embodiment of the present application, in step 3), 240m 2 The negative pressure of the sintering machine is controlled to be not lower than 13.5kPa,265m 2 The negative pressure of the sintering machine is controlled to be not lower than 15.5 kPa.
In one embodiment of the present application, in step 4), the composition of the finished sinter is: TFe:55% -58% of SiO 2 ：5.4%-5.7%、Al 2 O 3 ：2.30%-2.70%、P：0.040%-0.070%、S：0.010%-0.030%、MnO：0.40%-0.60%；
The drum strength of the finished sinter is 76-78%, and the alkalinity of the sinter is controlled according to 1.8.
In the application, the Brazil coarse powder is mainly formed by mixing card powder and high silicon bar; the PB powder is a professional full-name of Piermala mixed powder; the full name of the profession of FB powder is australian mixed powder.
In this application:
1) The proportion of the domestic iron concentrate powder is improved from 2% -3% to 5% -8%, and meanwhile, the domestic iron concentrate powder SiO 2 The content is adjusted downwards from 7 to 8 percent, the BRBF Brazilian coarse powder proportion is improved from 13 percent to 15 to 23 percent, and the PB powder proportion is reduced;
lime proportioning is controlled to be 5.0% -6.0%;
2) The moisture of the mixture is controlled according to 7.1% -7.3%;
3) The thickness of the material layer is increased from 800mm to 830mm, and the air permeability of the material layer is inhibited through material pressing operation;
the ignition temperature is increased from about 1100 ℃ to 1130-1150 ℃;
at two 240m 2 Sintering machine and 265m 2 Sintering machine tissue production, 240m 2 Negative pressure of sintering machine is not lower than 13.5kPa,265m 2 The negative pressure of the sintering machine is not lower than 15.5kPa;
4) Controlling sinter SiO 2 The control is carried out according to the lower limit as much as possible between 5.4% and 5.7%, the alkalinity of the sintering ore is controlled according to 1.8, and the FeO content of the sintering ore is increased from 7.5% to 8% to 9%.
In this application: (1) The content of crystal water in the FB powder is high, more heat is needed in the sintering process, and the consumption of coke powder is reduced as much as possible through process adjustment;
(2) According to the prior art, the porosity of the sinter is increased along with the increase of the proportion, the strength of the rotary drum is reduced, the internal return rate of the sinter is increased, and the like.
The working principle of the application is as follows:
(1) Preparing the following materials:
according to mineral powder resource conditions, the proportion of domestic iron concentrate or BRBF Brazil coarse powder is increased, through the collocation of different mineral seeds, firstly, the phenomenon that the porosity of the sintered ore is increased after the FB powder is matched in a large proportion is reduced, the influence on the strength of the sintered ore is avoided, secondly, magnetite is oxidized into exothermic reaction, part of heat can be released, part of fuel consumption is reduced, thirdly, the granularity composition of the mixture is improved, the domestic iron concentrate and BRBF Brazil coarse powder have finer granularity, the whole granularity of the FB powder is coarser, and the granularity uniformity of the mixture can be ensured after the FB powder and the FB powder are mutually combined;
the proportion of the lime powder is properly increased, so that the digestion and heat release are realized, the material temperature of the mixture is improved, the fuel consumption is reduced, the mixture is pelletized, the influence on air permeability after the proportion of the domestic fine iron powder and the Brazil coarse powder is increased is reduced, and the lime is taken as a flux, is an important component of binder phase calcium ferrite, and is favorable for improving the quality of sintered ores;
increasing the proportion of the coke powder, controlling FeO in the sinter to 8% -9%, increasing the liquid phase of the sinter, and ensuring that the sinter has good strength;
(2) Mixing: adjusting the moisture content of the mixture;
(3) Sintering: the thickness of the cloth is increased, the self-heat storage function of the thick material layer is fully utilized, and the fuel consumption is reduced as much as possible;
the ignition temperature is increased to improve the surface quality of the sinter, reduce the internal return of the sinter and improve the yield of the sinter;
according to the negative pressure condition of the sintering machine, the vertical sintering speed is properly restrained, and the end temperature of the sintering process is ensured by controlling the machine speed.
In the application, the units of element content, component content, proportion and ratio are all mass percent.
The method and the device which are not described in detail in the invention are all the prior art and are not described in detail.
In order to further understand the present invention, a method for producing sintered ore by using FB powder with high proportion provided by the present invention will be described in detail with reference to examples, and the scope of the present invention is not limited by the following examples.
Example 1
A method for producing sinter by high proportion of FB powder comprises the following steps in sequence:
1) And (3) batching: the mixture ratio of the raw materials is as follows: 15% of Brazil coarse powder, 15% of PB powder, 45% of FB powder, 5.0% of coke powder, 5% of lime powder, 8% of raw dolomite powder and the balance of domestic iron concentrate;
in the step 1), the domestic iron concentrate comprises the following components: TFe:65.14, siO 2 ：7.05%、Al 2 O 3 :0.43%, P:0.037%, S:0.148%, caO:0.64%, mgO:1.36%, moisture: 9.78%;
the components of brazil meal are TFe:62.59% of SiO 2 ：4.55%、Al 2 O 3 :1.54%, P:0.073%, S:0.014%, mnO:0.30 percent of water: 8.53% burn-out: 3.65%;
the PB powder comprises the following components: TFe:61.29%, and,SiO 2 ：3.65%、Al 2 O 3 :2.18%, P:0.106%, S:0.026%, mnO:0.17 percent of water: 9.52%, burn-out: 6.02%;
the FB powder comprises the following components: TFe:58.32% of SiO 2 ：5.69%、Al 2 O 3 :2.51%, P:0.092%, S:0.066%, mnO:0.68%, moisture: 8.36% of burn: 7.51%;
in the step 1), the granularity of the domestic iron concentrate is as follows: the proportion of less than or equal to 0.074mm is more than or equal to 75 percent;
the particle size of Brazil coarse powder is: the proportion of less than or equal to 1mm is less than or equal to 15.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the particle size of PB powder is: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 10.0 percent, and the proportion of more than 10mm is less than or equal to 5 percent;
the particle size of the FB powder is as follows: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the granularity of the coke powder is as follows: the proportion of less than or equal to 20mm is more than or equal to 95 percent, and the proportion of less than or equal to 1mm is not more than 30 percent;
the granularity of the lime powder is as follows: less than or equal to 3mm and less than or equal to 90 percent and less than or equal to 5mm;
the particle size of the raw dolomite powder is as follows: less than or equal to 3mm and less than or equal to 85 percent and less than or equal to 5mm;
2) Mixing: mixing the raw materials in the step 1), and obtaining a mixture after the mixing is completed, wherein the water content in the mixture is controlled according to 7.1% -7.3%;
3) Sintering: sequentially distributing, igniting and sintering the mixture obtained in the step 2);
the thickness of the material layer of the cloth is increased to 830mm, and the air permeability of the material layer is inhibited through material pressing operation;
the ignition temperature is increased to 1140 ℃;
in step 3), the sintering temperature was controlled according to 1260℃and the end temperature was controlled at the penultimate or third windbox of the tail, 240m 2 The final temperature of the sintering machine is controlled to be not lower than 450 ℃ and 265m 2 The final temperature of the sintering machine is controlled to be not lower than 420 ℃, and the machine speed of the sintering machine is controlled to be 1.4m/sThe vertical sintering speed is controlled according to 14.5-15.5 mm/min;
in step 3), 240m 2 The negative pressure of the sintering machine is controlled to be not lower than 13.5kPa,265m 2 The negative pressure of the sintering machine is controlled to be not lower than 15.5kPa;
after sintering is completed, obtaining sintered ore, wherein the FeO content in the sintered ore is increased to 8.5%;
4) Crushing, cooling and screening the sintered ore obtained in the step 3) in sequence to obtain a finished sintered ore;
in step 4), the components of the finished sinter are: TFe:56.12, siO 2 :5.45%、Al 2 O 3 :2.45%、P:0.058%、S:0.015%、MnO:0.48%；
The drum strength of the finished sintered ore is 76.85 percent, and the alkalinity of the sintered ore is controlled according to 1.8;
through detection, the granularity of 0-5mm is controlled within 6%, the quality of the sinter can meet the production requirement of a blast furnace, the fuel consumption of the sinter is increased within 1kg/t, the ton iron is reduced by more than 20 yuan, the production cost is reduced on the basis of environmental protection, and the social resource is saved.
Example 2
A method for producing sinter by high proportion of FB powder comprises the following steps in sequence:
1) And (3) batching: the mixture ratio of the raw materials is as follows: 20% of Brazil coarse powder, 12% of PB powder, 43% of FB powder, 4.7% of coke powder, 5.6% of lime powder, 7.4% of raw dolomite powder and the balance of domestic fine iron powder;
in the step 1), the domestic iron concentrate comprises the following components: TFe:65.14, siO 2 ：7.05%、Al 2 O 3 :0.43%, P:0.037%, S:0.148%, caO:0.64%, mgO:1.36%, moisture: 9.78%;
the components of brazil meal are TFe:62.59% of SiO 2 ：4.55%、Al 2 O 3 :1.54%, P:0.073%, S:0.014%, mnO:0.30 percent of water: 8.53% burn-out: 3.65%;
the PB powder comprises the following components: TFe:61.29, siO 2 ：3.65%、Al 2 O 3 ：2.18%、P：0.106% and S:0.026%, mnO:0.17 percent of water: 9.52%, burn-out: 6.02%;
the FB powder comprises the following components: TFe:58.32% of SiO 2 ：5.69%、Al 2 O 3 :2.51%, P:0.092%, S:0.066%, mnO:0.68%, moisture: 8.36% of burn: 7.51%;
in the step 1), the granularity of the domestic iron concentrate is as follows: the proportion of less than or equal to 0.074mm is more than or equal to 75 percent;
the particle size of Brazil coarse powder is: the proportion of less than or equal to 1mm is less than or equal to 15.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the particle size of PB powder is: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 10.0 percent, and the proportion of more than 10mm is less than or equal to 5 percent;
the particle size of the FB powder is as follows: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the granularity of the coke powder is as follows: the proportion of less than or equal to 20mm is more than or equal to 95 percent, and the proportion of less than or equal to 1mm is not more than 30 percent;
the granularity of the lime powder is as follows: less than or equal to 3mm and less than or equal to 90 percent and less than or equal to 5mm;
the particle size of the raw dolomite powder is as follows: less than or equal to 3mm and less than or equal to 85 percent and less than or equal to 5mm;
2) Mixing: mixing the raw materials in the step 1), and obtaining a mixture after the mixing is completed, wherein the water content in the mixture is controlled according to 7.1% -7.3%;
3) Sintering: sequentially distributing, igniting and sintering the mixture obtained in the step 2);
the thickness of the material layer of the cloth is increased to 830mm, and the air permeability of the material layer is inhibited through material pressing operation;
the ignition temperature is increased to 1150 ℃;
in step 3), the sintering temperature is controlled according to 1270deg.C, and the final temperature is controlled at the last one or the third bellows of the tail, wherein 240m 2 The final temperature of the sintering machine is controlled to be not lower than 450 ℃ and 265m 2 The end temperature of the sintering machine is controlled to be not lower than 420 ℃, the machine speed of the sintering machine is controlled to be more than 1.4m/s, and the vertical sintering speed is controlled to be 14.5-15.5 mm/min;
in step 3), 240m 2 The negative pressure of the sintering machine is controlled to be not lower than 13.5kPa,265m 2 The negative pressure of the sintering machine is controlled to be not lower than 15.5kPa;
after sintering is completed, obtaining sintered ore, wherein the FeO content in the sintered ore is increased to 9%;
4) Crushing, cooling and screening the sintered ore obtained in the step 3) in sequence to obtain a finished sintered ore;
in step 4), the components of the finished sinter are: TFe:56.63, siO 2 :5.63%、Al 2 O 3 :2.64%、P:0.062%、S:0.015%、MnO:0.51%；
The drum strength of the finished sintered ore is 76.53 percent, and the alkalinity of the sintered ore is controlled according to 1.8;
through detection, the granularity of 0-5mm is controlled within 6%, the quality of the sinter can meet the production requirement of a blast furnace, the fuel consumption of the sinter is increased within 1kg/t, the ton iron is reduced by more than 20 yuan, the production cost is reduced on the basis of environmental protection, and the social resource is saved.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (4)
1. The method for producing the sinter by the high-proportion FB powder is characterized by comprising the following steps of:
1) And (3) batching: the mixture ratio of the raw materials is as follows: 15 to 23 percent of Brazil coarse powder, 10 to 15 percent of PB powder, 35 to 45 percent of FB powder, 4.5 to 5.0 percent of coke powder, 5 to 6 percent of lime powder, 7 to 8 percent of raw dolomite powder and the balance of domestic iron concentrate powder;
2) Mixing: mixing the raw materials in the step 1), and obtaining a mixture after the mixing is completed, wherein the water content in the mixture is controlled according to 7.1% -7.3%;
3) Sintering: sequentially distributing, igniting and sintering the mixture obtained in the step 2);
the thickness of the material layer of the cloth is increased to 825mm-835mm, and the air permeability of the material layer is inhibited through material pressing operation;
the ignition temperature is increased to 1130-1150 ℃;
the sintering temperature is controlled according to 1250-1280 ℃, and the end temperature is controlled at the last one or the third one of the windboxes, wherein 240m 2 The final temperature of the sintering machine is controlled to be not lower than 450 ℃ and 265m 2 The end temperature of the sintering machine is controlled to be not lower than 420 ℃, the machine speed of the sintering machine is controlled to be more than 1.4m/s, and the vertical sintering speed is controlled to be 14.5-15.5 mm/min; 240m 2 The negative pressure of the sintering machine is controlled to be not lower than 13.5kPa,265m 2 The negative pressure of the sintering machine is controlled to be not lower than 15.5kPa;
after sintering is completed, obtaining sintered ore, and controlling SiO in the sintered ore 2 The content is 5.4-5.7%, and the FeO content in the sinter is increased to 8-9%;
4) And (3) crushing, cooling and screening the obtained sinter in the step (3) to obtain the finished sinter.
2. The method for producing sintered ore by high proportion of FB powder as claimed in claim 1, wherein in step 1), the components of the domestic fine iron powder are: TFe:64.0% -66.0% of SiO 2 ：6.5%-7.5%、Al 2 O 3 :0.40% -0.45%, P:0.035% -0.040%, S:0.145% -0.150%, caO:0.60% -0.70%, mgO:1.30% -1.40%, water: 9.70% -9.80%;
the components of Brazil coarse powder: TFe:62.0% -63.0% of SiO 2 ：4.50%-4.60%、Al 2 O 3 :1.50% -1.60%, P:0.070% -0.080%, S:0.010% -0.020%, mnO:0.25% -0.35%, moisture: 8% -9% of burning loss: 3.6% -3.7%;
the PB powder comprises the following components: TFe:61.0% -62.0% of SiO 2 ：3.6%-3.7%、Al 2 O 3 :2.1% -2.2%, P:0.10% -0.20%, S:0.02% -0.03%, mnO:0.15% -0.20%, moisture: 9.50% -9.60%, burn-out: 6.0% -6.1%;
the components of the FB powder are as follows: TFe:58.0% -60.0% of SiO 2 ：5.5%-6.0%、Al 2 O 3 :2.40% -2.70%, P:0.09% -0.10%, S:0.060% -0.070%, mnO:0.60% -0.70%, moisture: 8.30% -8.50%, burning loss: 7.40% -7.60%.
3. The method for producing sintered ore by high proportion of FB powder as claimed in claim 1, wherein in step 1), the particle size of the domestic fine iron powder is: the proportion of less than or equal to 0.074mm is more than or equal to 75 percent;
the particle size of Brazil coarse powder is: the proportion of less than or equal to 1mm is less than or equal to 15.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the particle size of PB powder is: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 10.0 percent, and the proportion of more than 10mm is less than or equal to 5 percent;
the particle size of the FB powder is as follows: the proportion of less than or equal to 1mm is less than or equal to 10.0 percent, the proportion of more than 6.3mm is less than or equal to 20.0 percent, and the proportion of more than 10mm is less than or equal to 10 percent;
the granularity of the coke powder is as follows: the proportion of less than or equal to 20mm is more than or equal to 95 percent, and the proportion of less than or equal to 1mm is not more than 30 percent;
the granularity of the lime powder is as follows: less than or equal to 3mm and less than or equal to 90 percent and less than or equal to 5mm;
the particle size of the raw dolomite powder is as follows: less than or equal to 3mm and less than or equal to 85 percent and less than or equal to 5mm.
4. The method for producing sintered ore by high proportion of FB powder as claimed in claim 1, wherein in step 4), the components of the sintered ore are: TFe:55% -58% of SiO 2 ：5.4%-5.7%、Al 2 O 3 ：2.30%-2.70%、P：0.040%-0.070%、S：0.010%-0.030%、MnO：0.40%-0.60%；
The drum strength of the finished sinter is 76-78%, and the alkalinity of the sinter is controlled according to 1.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210459662.XA CN114703364B (en) | 2022-04-28 | 2022-04-28 | Method for producing sinter by high-proportion FB powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210459662.XA CN114703364B (en) | 2022-04-28 | 2022-04-28 | Method for producing sinter by high-proportion FB powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114703364A CN114703364A (en) | 2022-07-05 |
| CN114703364B true CN114703364B (en) | 2024-01-26 |
Family
ID=82176993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210459662.XA Active CN114703364B (en) | 2022-04-28 | 2022-04-28 | Method for producing sinter by high-proportion FB powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114703364B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009114485A (en) * | 2007-11-02 | 2009-05-28 | Kobe Steel Ltd | Method for manufacturing sintered ore |
| CN108929948A (en) * | 2018-07-26 | 2018-12-04 | 上海慧安科技股份有限公司 | A kind of iron ore mixing powder dropping sheet, synergy using Sierra Leone coarse powder |
| CN108950190A (en) * | 2018-07-26 | 2018-12-07 | 上海慧安科技股份有限公司 | A kind of iron ore mixing powder dropping sheet, synergy using reduced iron powder |
| CN113136468A (en) * | 2021-04-20 | 2021-07-20 | 山东鑫华特钢集团有限公司 | Iron-making sintering rotary drum and particle size grading method |
-
2022
- 2022-04-28 CN CN202210459662.XA patent/CN114703364B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009114485A (en) * | 2007-11-02 | 2009-05-28 | Kobe Steel Ltd | Method for manufacturing sintered ore |
| CN108929948A (en) * | 2018-07-26 | 2018-12-04 | 上海慧安科技股份有限公司 | A kind of iron ore mixing powder dropping sheet, synergy using Sierra Leone coarse powder |
| CN108950190A (en) * | 2018-07-26 | 2018-12-07 | 上海慧安科技股份有限公司 | A kind of iron ore mixing powder dropping sheet, synergy using reduced iron powder |
| CN113136468A (en) * | 2021-04-20 | 2021-07-20 | 山东鑫华特钢集团有限公司 | Iron-making sintering rotary drum and particle size grading method |
Non-Patent Citations (2)
| Title |
|---|
| 本钢265m~2烧结机采用FB铁矿粉烧结生产研究;朱亚东;林宇;吴杰群;;本钢技术(第04期);13-15 * |
| 武钢配加进口磁铁矿的烧结基础特性试验研究;肖志新;陈令坤;贾斌;;钢铁研究(第04期);11-14 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114703364A (en) | 2022-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108754131B (en) | Sintering production method for optimizing fuel matching | |
| CN105002352A (en) | Preparation method of high-performance pellet binding agent | |
| CN111172385B (en) | Method for preparing sintered ore by using high-crystallization-water iron ore powder | |
| CN111910072A (en) | Preparation and use methods of pre-reduced fluxed pellets with steel slag as partial raw material | |
| CN109576488A (en) | A method of sinter is produced using high proportion Bayan Obo iron ore concentrate | |
| CN102181630A (en) | Method for using paigeite powder in sintering | |
| CN112195337A (en) | Sintered ore for improving production quality by controlling grain size of high-silicon flux and preparation method thereof | |
| CN113832339A (en) | Flux for sintering | |
| CN113817919A (en) | Sintered ore for improving production quality by controlling grain size of high-silicon flux and method thereof | |
| JPS60255937A (en) | Manufacture of cold-bound briquette | |
| CN114703364B (en) | Method for producing sinter by high-proportion FB powder | |
| CN104988309B (en) | Iron ore pellets boron magnesium compound binding agent and purposes and the processing method of acidic pellet ore | |
| CN113817917A (en) | Ore blending method based on iron ore granularity composition | |
| CN109825697B (en) | Sintered ore of high-proportion FMG super-fine powder and production method thereof | |
| JP4725230B2 (en) | Method for producing sintered ore | |
| CN114293010A (en) | Method for preparing sintered ore by adding steel slag through sintering process | |
| JP7473863B1 (en) | Molten iron production method using solid reduction furnace and submerged arc furnace | |
| CN114480836B (en) | Low-cost sinter of high-ratio vanadium-titanium magnetite concentrate and preparation method thereof | |
| CN112094969A (en) | Sintering method for reducing solid fuel consumption ratio | |
| CN113981212B (en) | Method for preparing sintered ore by batching without flux | |
| CN103343218B (en) | Method for improving strength and size composition of sinter | |
| CN110846497B (en) | Binder for magnesium-containing fluxed pellets and preparation method thereof | |
| CN109593954A (en) | A kind of manufacturing method of the high-strength sintered mine of low alkalinity | |
| CN110981232B (en) | Steel slag doped adhesive and preparation method thereof | |
| JP4661077B2 (en) | Method for producing sintered ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |