CN102839281B - Rotary hearth furnace direct-reduction is utilized to produce the method for blast furnace protecting titaniferous metallized pellet - Google Patents
Rotary hearth furnace direct-reduction is utilized to produce the method for blast furnace protecting titaniferous metallized pellet Download PDFInfo
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Abstract
The invention discloses a kind of method utilizing rotary hearth furnace direct-reduction to produce blast furnace protecting titaniferous metallized pellet.Titaniferous fine powder, compare for 1-1.2 according to carbon in compound and the Sauerstoffatom in ferriferous oxide, allocate a certain proportion of gas ash (carbon content 25%-40%) into, simultaneously, allocate the compound binding agent of 1%-3% into, by batching, humidification mixing, pair roller pressure ball, oven dry, rotary hearth furnace 1000-1350 DEG C high temperature reduction, produce the metallized pellet product containing titanium dioxide, as blast furnace high-quality furnace retaining material for blast furnace.This production technique, makes full use of carbon in blast furnace gravitational dust and sack dust as reductive agent; Eliminate the disadvantageous effect that harmful element circulation collection in blast furnace ironmaking such as potassium, sodium, zinc bring; Obtain economic blast furnace protecting metallized pellet product.
Description
Technical field
The invention belongs to metallurgical industry ironmaking field, relate to a kind of method utilizing rotary hearth furnace direct-reduction to produce blast furnace protecting titaniferous metallized pellet.
Background technology
Gas ash/mud is the product that solid particulate that iron-smelting blast furnace is discharged in smelting process obtains after dedusting, mainly comprise fine-particle minerals powder, coke powder and flux dust, be rich in the compositions such as iron, zinc, carbon, it is a kind of environmental pollutant, is again a kind of potential resource.China is premier Iron and Steel Production big country of the world, produces iron and steel about 500,000,000 tons per year, and by-product goes out gas ash about 4,000,000-600 ten thousand tons simultaneously.Due to gas ash complicated component, the reason such as granularity is tiny, moisture content fluctuation is large, comparatively difficult to its utilization.By the law of the western developed countries such as the U.S., this type of is leaded, the iron and steel flue dust of zinc is incorporated into as " poisonous solid waste ", requires to reclaim or Passivation Treatment lead wherein, diction etc., otherwise must seal stacking.In China, some enterprises by it directly or return sintering refining operation through ore dressing, to recycle iron wherein and carbon, what have is sent cement mill to do batching use or directly discharge to store up, this had both caused the waste of precious resources, again land occupation resource, also to environment.The current utilization for gas ash mainly concentrates on the recovery of iron and carbon; but it still also exists many shortcomings; such as nippon company is by blast furnace ironmaking and fume from steel making, iron ore concentrate, powdered carbon and binding agent mixed pelletizing; oven dry is placed on rotary hearth furnace, and external heat makes plumbous and other metallic impurity reduction evaporate and is deposited in fly-ash separator with discharging together with flue gas; Iron is also reduced into metal by carbon and generates metallized pellet simultaneously, directly can add blast furnace ironmaking.The advantage of this technique is that material component utilization is more reasonable, shortcoming is still containing higher impurity in the metal pelletizing after process, blast furnace requires pelletizing ferrous grade high (general >=60%), and this just must separately allocate higher-grade ferrous material into, and directly can not use gas ash separately.Containing carbon in gas ash, and recycle the carbon component in gas ash, be such as used as furnace retaining and use then unmanned trial.
Along with the strengthening of blast-furnace smelting, blast furnace burden is day by day deteriorated, and blast furnace campaign shortens increasingly, has affected the raising of iron and steel enterprise's overall economic efficiency, becomes the major issue urgently to be resolved hurrily that current blast-furnace smelting is quite outstanding.In order to extend blast furnace campaign as far as possible, except the enterprising Row sum-equal matrix of regular job system, generally adopt both at home and abroad and add containing titanium ore, tuyere injection vanadium titanium fine powder and air port are fed the modes such as titanium wire and are carried out blast furnace protecting.It mainly make use of TiO
2in blast furnace, be reduced into Ti (C N) high-melting-point substances, this material due to fusing point high, bottom blast furnace hearth and edge low temperature district solidify, serve the effect of fettling.Tuyere injection titanium fine powder is higher with hello titanium wire furnace retaining mode cost, and is applicable to fix a point, determine region, remedial furnace retaining.It is then a kind of preventative furnace retaining mode that blast furnace adds containing titanium ore, and cost is lower.
In actual production, blast fumance, to the stove labour later stage, will consider that furnace retaining operates, and namely blast furnace feeding material adds appropriate containing titanium ore, ensures certain titanium load, makes to maintain titanium content in molten iron at certain level.But different titaniferous furnace retaining material adds in blast furnace, also different on blast furnace operating impact.The tradition titaniferous furnace retaining material added in blast furnace is mainly titaniferous agglomerate or acid titaniferous acid pellet, on the one hand due to adding containing titanium ore, reduce the comprehensive grade into furnace charge, reduce blast fumance efficiency, be unfavorable for producing, containing titanium ore, the furnace charge reaction in blast furnace and Performance of Slag had a negative impact on the other hand.In order to overcome the defect of above-mentioned titaniferous furnace retaining material, invent a kind of method that rotary hearth furnace direct-reduction produces blast furnace protecting titaniferous metallized pellet.
Summary of the invention
For overcoming the deficiency of present technology, the invention provides a kind of method that rotary hearth furnace direct-reduction produces blast furnace protecting titaniferous metallized pellet, thus obtain a kind of more economical, metallurgical performance better blast furnace protecting titaniferous metallized pellet.
Technical scheme of the present invention is: with gas ash (blast furnace gravitational dust and or sack dust, gas mud), titaniferous fine powder and compound binding agent for raw material, blast furnace protecting titaniferous ball metallized pellet is produced, its Production Flow Chart: batching → humidification mixing → pair roller pressure ball → oven dry → rotary hearth furnace reduction → titaniferous metallized pellet product by rotary hearth furnace direct-reduction.
Detailed process is titaniferous fine powder, according to C/O atomic ratio 1-1.2:1 in compound, allocate into a certain proportion of blast furnace gravitational dust and or sack dust (carbon content 25%-40%), simultaneously, allocate into gas ash and fine powder weight and the compound binding agent of 1%-3%, by batching, humidification mixing, pair roller pressure ball, oven dry, rotary hearth furnace 1000-1350 DEG C high temperature reduction, produce the metallized pellet product containing titanium dioxide, as blast furnace high-quality furnace retaining material for blast furnace.
Described titaniferous fine powder is TiO
2there is a certain proportion of fine iron breeze in content, wherein: TiO
2content 6 ~ 15%, TFe content 45 ~ 60%, SiO
2content 1 ~ 10%, CaO content 0.1 ~ 4%, Al
2o
3content 0.1 ~ 5%, content of MgO 0.1 ~ 3%.
Described gravitational dust and sack dust are the byproduct of ironmaking.In blast furnace ironmaking process, the zinc contained by iron ore, lead, basic metal etc. are reduced and form steam, outside being come out of the stove, then it are caught by the coal gas dust removal purification system outside stove and remove with ore, coke together with the fine dust of flux etc. with blast furnace gas by band.Gas dust removal system is from gravitational dust collection and meticulous dedusting two sections composition, and the dry type coarse dust trapped through first paragraph is called gravitational dust; The meticulous fly-ash separator of second segment adopts dry bag-type dust-precipitator or wet method dedusting system, the dry type grain dust trapped with the former is called sack dust, be called gas mud with the latter through the mud of precipitation process gained, after gas mud drying and processing, can equally with sack dust use.
Described sack dust thinner (major part is below 200 orders), not only can produce dust pollution when making agglomerates of sintered pellets, and affect the ventilation property of agglomerates of sintered pellets sintering process, add the energy consumption of Steel Plant, have impact on Environmental Protection Level.Its main component comprises TFe content 20 ~ 35%, C content 28 ~ 40%, SiO
2content 2 ~ 8%, ZnO content 0.1 ~ 18%, remaining component also comprises calcium, magnesium, aluminium and lead, basic metal etc.
Described gravitational dust granularity is very little (major part is below 200 orders) also, and main component comprises TFe content 25 ~ 40%, C content 25 ~ 35%, SiO
2content 2 ~ 8%, ZnO content 0.1 ~ 15%, remaining component also comprises calcium, magnesium, aluminium and lead, basic metal etc.
Compound binding agent is the cooperation binding agent of organic binder bond and inorganic adhesive herein, and wherein organic binder bond comprises humic acids, and inorganic adhesive comprises wilkinite, and its using method is common practise.
Herein in technique, humidification can prevent from causing dust pollution, and preventing affects ventilation property during sintering, during humidification, controls moisture and is advisable about 6 ~ 12%.
In reduction process, control reduction temperature at 1000 ~ 1350 DEG C, the recovery time is 15-30min, and the concrete reducing process of rotary hearth furnace is the common practise of this area.
Effect of the present invention has considered utilization of resources, obtains the blast furnace protecting material that Iron grade is higher, metallurgical performance is better and more economical.Compared with original titaniferous furnace retaining material, this titaniferous furnace retaining material can improve into the comprehensive ferrous grade of furnace charge, and improves blast-furnace technique economic target.Meanwhile, take full advantage of the carbon in blast furnace gravitational dust and sack dust, effectively eliminate the production disadvantageous effect that harmful element zinc, lead and basic metal etc. bring at blast furnace circulating enrichment.
Accompanying drawing explanation
Fig. 1 is with gas ash, titaniferous fine powder and compound binding agent for raw material, produces blast furnace protecting titaniferous ball metallized pellet process flow sheet by rotary hearth furnace direct-reduction.
Embodiment
The present invention will be described with titaniferous metallized pellet example to produce blast furnace protecting in conjunction with Laigang rotary hearth furnace direct-reduction.Present invention process flow process: batching → humidification mixing → pair roller pressure ball → oven dry → rotary hearth furnace reduction → titaniferous metallized pellet product.
Embodiment 1:
Raw material: blast furnace gravitational dust, titaniferous fine powder and compound binding agent.Wherein blast furnace gravitational dust carbon containing 32% is 36% containing TFe; Titaniferous fine powder is containing TiO
2being 7.8%, is 59.2% containing TFe.
Implementation process: be 1.2 than C/O by calculating carbon with the Sauerstoffatom in ferriferous oxide, determine 50% blast furnace gravitational dust+50% titaniferous fine powder+3% compound binding agent (two kinds of binding agent equal proportion mixing) mixing match, humidification controls moisture content 8%, mixed by intensive mixer, pair roller ball press pressure ball is added after mixing, dry through drying grate and enter rotary hearth furnace, rotary hearth furnace preheating section, reduce two sections, soaking two sections uses blast furnace gas, reducing one section and soaking one section all uses coke-oven gas, control rotary hearth furnace five sections of temperature: be respectively preheating section 1050-1150 DEG C, reduce one section of 1100-1250 DEG C, reduce two sections of 1150-1300 DEG C, soaking one section of 1200-1300 DEG C, soaking two sections of 1100-1200 DEG C, the high temperature reduction time is 25min, obtain metallized pellet product.TiO in metallized pellet product
2content is 5.6%, TFe68.6%, MFe48.02%, and degree of metalization is 70%.Laigang Stocks Trading Co 4
#1000m
3blast furnace uses rotary hearth furnace titaniferous metallized pellet to carry out furnace retaining, the comprehensive Iron grade 57% of blast furnace feeding material, for the titanium load controlled into furnace charge is no more than 8kg/tfe, substituting acid pellet with rotary hearth furnace titaniferous metallized pellet by 8% in production adds in blast furnace, conditions of blast furnace is good, in molten iron, titanium content reaches expection requirement, serves the effect of alternative original titanium ore furnace retaining.
Embodiment 2:
Raw material: blast furnace cloth bag ash, blast furnace gravitational dust, titaniferous fine powder and compound binding agent.Wherein blast furnace cloth bag ash carbon containing 30%, is 20% containing TFe; Blast furnace gravitational dust carbon containing 32%, containing TFe36%; Titaniferous fine powder is containing TiO
2being 6.7%, is 59.2% containing TFe.
Implementation process: be 1.1 than C/O by calculating carbon with the Sauerstoffatom in ferriferous oxide, according to 20% blast furnace gravitational dust+30% blast furnace cloth bag ash+50% titaniferous fine powder+3% compound binding agent (two kinds of binding agent equal proportion mixing) mixing, humidification controls moisture content 8%, mixed by intensive mixer, pair roller ball press pressure ball is added after mixing, dry through drying grate and enter rotary hearth furnace, rotary hearth furnace preheating section, reduce one section, reduce two sections, soaking one section and soaking two sections all use coke-oven gas, control rotary hearth furnace five sections of temperature: be respectively preheating section 1050-1150 DEG C, reduce one section of 1100-1250 DEG C, reduce two sections of 1150-1300 DEG C, soaking one section of 1200-1300 DEG C, soaking two sections of 1100-1200 DEG C, the high temperature reduction time is 30min, obtain metallized pellet product.TiO in metallized pellet product
2content is 3.52%, TFe67.02%, MFe55.29%, and degree of metalization is 82.49%.Laigang Stocks Trading Co 4
#1000m
3blast furnace uses rotary hearth furnace titaniferous metallized pellet to carry out furnace retaining, the comprehensive Iron grade 57% of blast furnace feeding material, for the titanium load controlled into furnace charge is no more than 8kg/tfe, substituting acid pellet with rotary hearth furnace titaniferous metallized pellet by 10% in production adds in blast furnace, conditions of blast furnace is good, in molten iron, titanium content reaches expection requirement, serves the effect of alternative original titanium ore furnace retaining.
Embodiment 3:
Raw material: blast furnace cloth bag ash, titaniferous fine powder and compound binding agent.Wherein blast furnace cloth bag ash carbon containing 25%, is 38% containing TFe; Titaniferous fine powder is containing TiO
2being 14.7%, is 45.3% containing TFe.
Implementation process: be 1.1 than C/O by calculating carbon with the Sauerstoffatom in ferriferous oxide, determine 40% blast furnace cloth bag ash+60% titaniferous fine powder+1% compound binding agent (two kinds of binding agent equal proportion mixing) mixing match, humidification controls moisture content 6%, mixed by intensive mixer, pair roller ball press pressure ball is added after mixing, dry through drying grate and enter rotary hearth furnace, rotary hearth furnace preheating section, reduce one section, reduce two sections, soaking one section, soaking two sections all uses coke-oven gas, control rotary hearth furnace five sections of temperature: be respectively preheating section 1050-1150 DEG C, reduce one section of 1100-1250 DEG C, reduce two sections of 1150-1300 DEG C, soaking one section of 1200-1300 DEG C, soaking two sections of 1100-1200 DEG C, the high temperature reduction time is 15min, obtain metallized pellet product.TiO in metallized pellet product
2content is 11.36%, TFe54.61%, MFe40.96%, and degree of metalization is 75%.Laigang Stocks Trading Co 4
#1000m
3blast furnace uses rotary hearth furnace titaniferous metallized pellet to carry out furnace retaining, the comprehensive Iron grade 57% of blast furnace feeding material, for the titanium load controlled into furnace charge is no more than 8kg/tfe, substituting acid pellet with rotary hearth furnace titaniferous metallized pellet by 3% in production adds in blast furnace, conditions of blast furnace is good, in molten iron, titanium content reaches expection requirement, serves the effect of alternative original titanium ore furnace retaining.
Embodiment 4:
Raw material: the gas mud after oven dry, titaniferous fine powder and compound binding agent.Wherein gas mud (after drying) carbon containing 40%, is 20% containing TFe; Titaniferous fine powder is containing TiO
2being 10.7%, is 51.2% containing TFe.
Implementation process: be 1.0 than C/O by calculating carbon with the Sauerstoffatom in ferriferous oxide, determine 25% gas mud+75% titaniferous fine powder+2% compound binding agent (two kinds of binding agent equal proportion mixing) mixing match, humidification controls moisture content 12%, mixed by intensive mixer, pair roller ball press pressure ball is added after mixing, dry through drying grate and enter rotary hearth furnace, rotary hearth furnace preheating section, reduce two sections, soaking two sections uses blast furnace gas, reducing one section and soaking one section all uses coke-oven gas, control rotary hearth furnace five sections of temperature: be respectively preheating section 1050-1150 DEG C, reduce one section of 1100-1250 DEG C, reduce two sections of 1150-1300 DEG C, soaking one section of 1200-1300 DEG C, soaking two sections of 1100-1200 DEG C, the high temperature reduction time is 25min, obtain metallized pellet product.TiO in metallized pellet product
2content is 10.1%, TFe55.05%, MFe37.06%, and degree of metalization is 67.32%.Laigang Stocks Trading Co 4#1000m
3blast furnace uses rotary hearth furnace titaniferous metallized pellet to carry out furnace retaining, the comprehensive Iron grade 57% of blast furnace feeding material, for the titanium load controlled into furnace charge is no more than 8kg/tfe, substituting acid pellet with rotary hearth furnace titaniferous metallized pellet by 3.5% in production adds in blast furnace, conditions of blast furnace is good, in molten iron, titanium content reaches expection requirement, serves the effect of alternative original titanium ore furnace retaining.
Claims (5)
1. utilize rotary hearth furnace direct-reduction to produce a method for blast furnace protecting titaniferous metallized pellet, comprising:
Titaniferous fine powder, gas ash, and binding agent mixes and obtains compound, by batching, humidification mixing, pressure ball, oven dry, rotary hearth furnace high temperature reduction, obtains product;
Described gas ash comprises blast furnace gravitational dust or sack dust, or the gas mud after drying, or its combination;
In described compound, in C and ferriferous oxide, Sauerstoffatom ratio is 1 ~ 1.2:1;
The weight of described binding agent account for titaniferous fine powder and gas ash weight and 1 ~ 3%;
Described gas ash all contains carbon, and carbon content is 25%-40%, TFe content is 20 ~ 40%;
In described titaniferous fine powder, TiO2 content is 6%-15%, TFe content is 45 ~ 60%.
2. method according to claim 1, is characterized in that, described binding agent is organic and inorganic composite adhesive, and wherein mineral binder bond is wilkinite, and organic binder bond is humic acids.
3. method according to claim 1, is characterized in that, in described humidification, the content of the moisture content in compound is 6 ~ 12%.
4. method according to claim 1, it is characterized in that, described rotary hearth furnace high temperature reduction process is divided into preheating section, reduction one section, reduction two sections, soaking one section, soaking two sections of double teachers, and each phase temperature controls between 1000-1350 DEG C, and the reduction temperature time is 15 ~ 30 minutes.
5. method according to claim 1, is characterized in that, in described metallized pellet process of producing product, reduction of ferrous oxide becomes metallic iron, and degree of metalization reaches 60%-95%.
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| CN103266223B (en) * | 2013-05-24 | 2015-02-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace maintenance vanadium-titanium pellet for normal blast furnace and production method thereof |
| CN105907990B (en) * | 2016-05-26 | 2018-03-23 | 江苏省冶金设计院有限公司 | A kind of method for producing ferro-niobium |
| CN106367586A (en) * | 2016-11-22 | 2017-02-01 | 江苏省冶金设计院有限公司 | System and method for treating titanium concentrate |
| CN106399666A (en) * | 2016-11-22 | 2017-02-15 | 江苏省冶金设计院有限公司 | System and method for treating titanium concentrate by combining rotary hearth furnace and electric furnace |
| CN114164342A (en) * | 2021-12-06 | 2022-03-11 | 昆明理工大学 | Method for producing limonite pellets by adding humic acid |
| CN114350864B (en) * | 2022-01-06 | 2023-03-17 | 首钢京唐钢铁联合有限责任公司 | Method for controlling addition of large-scale blast furnace metallized balls |
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Inventor after: Zeng Hui Inventor after: An Jinbo Inventor after: Zhou Xiaohui Inventor after: Wei Kaiqing Inventor after: Liang Dong Inventor after: Chen Wei Inventor after: Zhang Ying Inventor after: Luo Xiaguang Inventor after: Wang Yanping Inventor after: Zhou Lin Inventor before: Zeng Hui Inventor before: Zhou Xiaohui Inventor before: Liang Dong Inventor before: Chen Wei Inventor before: Zhang Ying Inventor before: Luo Xiaguang Inventor before: Wang Yanping Inventor before: Zhou Lin Inventor before: An Jinbo |
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Free format text: CORRECT: INVENTOR; FROM: CENG HUI ZHOU XIAOHUI LIANG DONG CHEN WEI ZHANG YING LUO XIAGUANG WANG YANPING ZHOU LIN AN JINBO TO: CENG HUI ZHOU XIAOHUI WEI KAIQING LIANG DONG CHEN WEI ZHANG YING LUO XIAGUANG WANG YANPING ZHOU LIN AN JINBO |
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