CN110172536A - Blast furnace raw material workshop reduces ratio method of returning mine - Google Patents
Blast furnace raw material workshop reduces ratio method of returning mine Download PDFInfo
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- CN110172536A CN110172536A CN201910495283.4A CN201910495283A CN110172536A CN 110172536 A CN110172536 A CN 110172536A CN 201910495283 A CN201910495283 A CN 201910495283A CN 110172536 A CN110172536 A CN 110172536A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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- 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
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Abstract
The present invention relates to blast-furnace technique fields, and it discloses blast furnace raw material workshop and reduces and return mine ratio method, include the following steps, it is mounted with Vibration rod screen respectively in the feed inlet of two four-roller crushers, using come the coke cutting powder processed after vibrating screen, grain coke on sieve greater than ten millimeters selects machine to be sent in specified feed bin by belt is defeated, then transports to stock ground by vehicle backing and use to blast furnace, and the coke powder under sieving less than ten millimeters is crushed into people's four-roller crusher.The blast furnace raw material workshop reduces ratio method of returning mine, the control of ratio iron ore ratio is returned mine below 45 percent by reducing brown vanadium titanium blast furnace raw material workshop, and after being replaced with a certain proportion of print powder and fine powder, sinter granularmetric composition is more uniform, rotary drum goes intensity to improve, all other indexs are able to satisfy blast furnace requirement, after zero to three millimeter of grade of quick lime reaches 93 or more percent, sinter mineralization improves, CaO " white point " is reduced in sinter, drum strength improves, and the rate of return mine reduces.
Description
Technical field
The present invention relates to blast-furnace technique field, specially blast furnace raw material workshop reduces ratio method of returning mine.
Background technique
Sinter is that iron ore concentrate or rich ore powder are incorporated a certain number of solid fuels and flux, bulk made of being sintered
Furnace charge, it and pellet and referred to as enriched ore, sinter can be divided into acid sinter ore, self-fluxed sinter, fluxed sintering
4 kinds of mine and high basicity sinter etc., acid sinter ore is rarely employed after the 1950s, mainly using fluxed or high-alkali
Sinter is spent, the performance of high basicity sinter is several all better than other, therefore have developed rapidly, natural high-grad iron ore deposit proportion in blast furnace burden
When higher, the consumption of blast-furnace coke can be greatly reduced with the flux in high basicity sinter substitution furnace charge.
Domestic iron-bearing material is in short supply in recent years, and international market Iron Ore Powder price is constantly climbed to a higher point, the raw material of steel industry
Cost increases substantially, and small sintering ore rate is high, makes to reduce into furnace sinter, and agglomerate ratio reduces, and pig iron cost increases, and is greater than five
The powder of returning mine of millimeter grade participates in being sintered again, not only increases the process energy consumption of sinter, if can also when quantity of return mines is excessive
Sintering process is influenced, the drum strength of sinter is influenced, causes vicious circle, so propose that blast furnace raw material workshop reduces ratio of returning mine
Example method solves the problems, such as above-mentioned propose.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides blast furnace raw material workshops to reduce ratio method of returning mine, and has reduction
The advantages of rate of return mine, solves small sintering ore rate height, makes to reduce into furnace sinter, and agglomerate ratio reduces, and pig iron cost increases, greatly
It participates in being sintered again in the powder of returning mine of five millimeters of grades, not only increases the process energy consumption of sinter, if quantity of return mines is excessive
The problem of also will affect sintering process, influencing the drum strength of sinter, cause vicious circle.
(2) technical solution
For the purpose for realizing the above-mentioned reduction rate of return mine, returned the invention provides the following technical scheme: blast furnace raw material workshop reduces
Mine ratio method, comprising the following steps:
1) be mounted with Vibration rod screen respectively in the feed inlet of two four-roller crushers, using come the coke cutting powder processed through over vibration
After dynamic sieve, the grain coke on sieve greater than ten millimeters selects machine to be sent in specified feed bin by belt is defeated, then transports to stock ground by vehicle backing
It is used to blast furnace, and the coke powder under sieving less than ten millimeters is crushed into people's four-roller crusher, by this measure, is on the one hand made
The qualified grain coke in part directly feeds blast furnace, reduces costs, the technique on the other hand making the coke cutting powder into four-roller reach production
It is required that solve the situation containing grain coke in processing coke powder, it is ensured that going on smoothly for four-roller processing requires in production
Post personnel clears up the coarse grain coke that vibrating screen grate bar retains come in time, keeps sieve pore unimpeded, in addition suitable control coke cutting powder is sent out
Two roller gaps above and below doses and in time adjustment crusher, regular turning roller, after taking the above measure, zero to three millimeter of coke powder
Grain proportion is increased to 75 or more percent, provides better polity's fuel condition for sintering production, solves burning
The knot problem big up to journey temperature deviation, has further stabilized and increased the drum strength and yield of sinter；
2) in order to reach 1,100 degrees Celsius or more of firing temperature, reduce the duration of ignition, built up one it is horizontal pre-
Hot stove, by combustion air and blast furnace gas by supplying sintering ignition furnace after preheating stove heating, the combustion air temperature after preheating
To 300 to 400 degrees Celsius, blast furnace gas temperature reach 150 to 300 degrees Celsius, to improve sintering ignition matter
The duration of ignition is measured and shortened, sintering mineral products and quality are improved, as steel STEELMAKING PRODUCTION is gradually stable, coal gas of converter is existing
It is more than needed, it is incorporated to sintering system pipeline shield gaspipe line is turned, realizes application of the coal gas of converter as igniting dyestuff in sintering,
The case where being restricted sintering production by blast-furnace gas pressure and quality fluctuation before improving, in addition coal gas of converter impurity is few, purity
High, calorific capacity height and ignition intensity are good, reach 1,150 degrees centigrades using firing temperature after coal gas of converter, and steady
Fixed, igniting chamber flame friend is bright, dust is few, and uniformly, sintering feed face color is in cyan to the igniting of trolley charge level, makes entire sintering process object
More abundant, sinter epigranular is completed in Physicochemical reaction, is returned mine few, high yield rate；
3) for steel raw material mix coarse size, good permeability is opened the characteristics of, by sintering material layer thickness by 700 original millis
Rice is increased to 750 millimeters, after the bed of material improves, and sintering feed skin glass matter is opposite to be reduced, and top heat supply is sufficient, and the bed of material is high
The warm retention time is long, and sinter crystallizable mineral is abundant, is conducive to the improvement of sinter internal structure, meanwhile, deep bed sintering is conducive to
The crackle that generates and gap makes up and from fine and close, because auto accumulation heat acts on, further decrease burnup, produce after limonite decomposes
After real postscript shows that material exhibition improves, less than ten millimeters grain size contents are reduced in sinter, sinter strength and yield rate raising, combustion
Consumption reduces by 1 point 2 kilogram per ton；
4) to mitigate edge effect to sintering bring negative effect, two groups of activities are installed between distributing device and igniting chamber
Pressure roller, a pressure roller length close to distributing device are 2 points 8 meters, and main function is to compress the bed of material in the middle part of trolley, later group pressure
Roller abuts the baffle of trolley, and the bed of material on the inside of baffle is compressed, and is acted on by the pressure of above-mentioned two groups of pressure rollers, reduces mixture
Intergranular gap, the liquid phase convenient for generating in sintering process closely cohere mineral powder granular, improve cohesive force, while also improving
Consolidation between miberal powder, to achieve the purpose that binder；
5) to the inspection of sieve hard point and maintenance under blast furnace ore tank, sieve pore is replaced in time and wears faster sieve, otherwise for
Sinter screen-aperture situation bigger than normal under blast furnace ore tank, the sieve that equipment division is 4 points 5 millimeters using sieve pore is instead of sieve pore
For six millimeters of sieve, the portion screen by granularity in sinter return fine greater than five millimeters is come out plus people's blast furnace participates in ironmaking, thus
Improve blast furnace agglomerate ratio, the low sintering energy consumption in land.
(3) beneficial effect
Compared with prior art, the present invention provides blast furnace raw material workshops to reduce ratio method of returning mine, and has following beneficial
Effect:
1, the blast furnace raw material workshop reduces and returns mine ratio method, by by the control of limonite ratio 45 percent with
Under, and after being replaced with a certain proportion of print powder and fine powder, sinter granularmetric composition is more uniform, and rotary drum goes intensity to improve,
Its indices is able to satisfy blast furnace requirement, after zero to three millimeter of grade of quick lime reaches 93 or more percent, sinter
Mineralization improves, and CaO " white point " is reduced in sinter, and drum strength improves, and the rate of return mine reduces, and is sintered materials feelings according to steel
Condition, by the control of zero to three millimeter of grade of coke powder at 75 or more percent, the drum strength of sinter is improved, rate of return mine drop
Low, while the output increased of sinter, it is Celsius that the combustion air of ignition furnace by preheating furnace is preheating to 300 to 400 by Zhang Gang
Degree, is preheating to 150 to 300 degrees Celsius for blast furnace gas, further through the comprehensive utilization of blast furnace gas and coal gas of converter, makes
Firing temperature is increased to 1,150 degrees Celsius, improves sinter strength, and the rate of return mine reduces, for a steel sintered compound
Material granularity is thicker, and after thickness of feed layer is increased to 750 millimeters, sintered ore rotary drum strength is improved, and burnup reduces.
2, the blast furnace raw material workshop reduces ratio method of returning mine, and after being implemented by pressure roller Strand Feeding Technique, restrained effectively
It is sintered edge effect, keeps the air flow method of sintering process more uniform, improves sintering effective wind rate, reduce pallet two
Side raw material slow down the cooling velocity of middle and upper part, improve sinter quality, improve sintered ore rotary drum strength, reduce and return
Mine rate reduces sinter return fine greater than five millimeters by reinforcing screening plant management under blast furnace, and using the sieve of small-bore
Part, make small sintering ore rate decline.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment one: blast furnace raw material workshop reduces ratio method of returning mine, comprising the following steps:
To optimize material structure, sinter quality is improved, according to existing material situation, it is contemplated that sintering cost is taken
The material proportion of five kinds of schemes has carried out sintering test, sintered ore rotary drum strength and grade group of this test to five kinds of schemes
At being tested, aiming at the problem that quick lime ingredient fluctuates big and coarse size, the inspection to quick lime of marching into the arena is strengthened,
Granularity is unqualified to forbid putting in storage, it is ensured that zero to three millimeter of grade of quick lime reaches 93 or more percent, it is ensured that is being surveyed
The proportion for raw materials for sintering occur can be showed when examination, increases the accuracy of test, avoid fluctuation and granularity because of quick lime
The test process for influencing entire proportions of sintering raw materials, the sufficient reaction ratio change in process of the result for enabling test to obtain.
Proportions of sintering raw materials table
Scheme corresponds to sinter grade
In an experiment, after the proportion of PB powder and Australia thick 56 being reduced, make limonite ratio no more than 45 percent, then
With addition of a certain proportion of print powder and fine powder, scheme 4 and scheme 5 in table as above, sinter granularmetric composition is more uniform, drum strength
It improves, all other indexs reach blast furnace requirement.
Embodiment two: blast furnace raw material workshop reduces ratio method of returning mine, comprising the following steps:
1) according to 43% vanadium titano-magnetite concentrate (TFe grade is 54.2%), 34% high grade iron miberal powder (TFe product
Position for 58.5%), grade Iron Ore Powder (TFe grade be 38%) in 5%, 4% lime stone, 6% activity be grey, 5% coke powder, 1%
Gas ash and steel slag, quick lime and activity ash uses temperature to be digested for 40~70 DEG C of hot water, then with other sinters
Material, which is added in a mixed roller, carries out uniform mixing；
2) according to 82% vanadium titano-magnetite concentrate (TFe grade is 54.2%), 4.5% paigeite concentrate (TFe grade
For 53.8%), 3.5% coal dust, carry out ingredient and dry-mixed, 10% quick lime carries out sufficiently digestion in 85 DEG C of hot water to obtain
Flux molten slurry；
3) it is calculated in conjunction with said ratio, the sintering in step 1) and step 2) is mixed by vanadium titano-magnetite concentrate always with mine amount
Refining is infiltrated outside row according to 75% and 25% addition two respectively wraps up in mixing, specifically, first presses sintering mixing material in step 1)
75% than being refitted in two dark feed rollers, mixing 40s, mixes in material sprinkling step 2) to the sintering in step 1) and makes after digestion
The flux molten slurry obtained, while the sintering of the step 2) of 25% specific gravity is mixed into material (not including quick lime), the interior mixing of two mixed rollers is added
Expect surface, and sprays part spray water.The two mixed 4min that are granulated terminate, and through measuring, two mixed mixture moistures are 7.3%；
4) in 300 × 800mm of Φ (diameter 300mm, high 800mm) sintered cup, under the conditions of grate-layer material is 20mm, by two
Dark refining is uniformly laid in cup body, is lighted a fire under the conditions of 1100 DEG C of temperature, is taken out under the conditions of negative pressure is 14.5KPa
Wind sintering, terminates sintering when sintering end point temperature is 300 DEG C.It is crushed, sieved, after rotary drum measurement, compared to traditional vanadium titanium
Magnetic iron ore is sintered benchmarks, and sinter yield rate improves 1.35%, and tumbler index improves 1.2%, and sinter Perovskite Phase has
Significantly increase, is sintered usage factor from 1.295t/m2H is improved to 1.312t/m2·h。
Be conducive to generate enough liquid phase Binder Phases and intensity height, Well-recovered ferrous acid calcium phase during the sintering process, from
And improve the quality of sinter.
The beneficial effects of the present invention are: by limonite ratio is controlled 45 percent hereinafter, and with certain ratio
After the print powder of example is replaced with fine powder, sinter granularmetric composition is more uniform, and rotary drum goes intensity to improve, the equal energy of all other indexs
Meet blast furnace requirement, after zero to three millimeter of grade of quick lime reaches 93 or more percent, sinter mineralization is improved, and is burnt
It ties CaO " white point " in mine to reduce, drum strength improves, and the rate of return mine reduces, and materials situation is sintered according to steel, by coke powder zero to three
At 75 or more percent, the drum strength of sinter is improved, and the rate of return mine reduces for millimeter grade control, while sinter
Output increased, the combustion air of ignition furnace is preheating to 300 to 400 degrees Celsius by preheating furnace by Zhang Gang, and blast furnace gas is pre-
To 150 to 300 degrees Celsius of heat, further through the comprehensive utilization of blast furnace gas and coal gas of converter, it is increased to firing temperature
1150 degrees Celsius, improve sinter strength, the rate of return mine reduces, and it is thicker for steel sinter mixture granularity, it will
After thickness of feed layer is increased to 750 millimeters, sintered ore rotary drum strength is improved, and burnup reduces, and is implemented by pressure roller Strand Feeding Technique
Afterwards, it restrained effectively sintering edge effect, keep the air flow method of sintering process more uniform, improve sintering effective wind rate,
Reduce pallet two sides raw material, slow down the cooling velocity of middle and upper part, improve sinter quality, improves sinter and turn
Drum intensity, reduces the rate of return mine, by reinforcing screening plant management under blast furnace, and using the sieve of small-bore, reduces burning
The part returned mine greater than five millimeters is tied, small sintering ore rate is declined, small sintering ore rate height is solved, makes to subtract into furnace sinter
Few, agglomerate ratio reduces, and pig iron cost increases, and the powder of returning mine greater than five millimeters of grades participates in being sintered again, not only makes sinter
Process energy consumption increases, if also will affect sintering process when quantity of return mines is excessive, influences the drum strength of sinter, causes pernicious follow
The problem of ring, following table are three burnings, two machine same period energy consumption controls.
Thus table can be seen that is increased by the measures to effectively increase energy savings and reduce material consumption thickness of feed layer that three sintering are taken, the range of decrease under yield
Less, power consumption, water consume, gas consumption and solid burnup have different degrees of decline, especially solid burnup fall to degree
It is larger, cost is saved, while ensure that and provide sufficient and good sinter for blast furnace.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (1)
1. blast furnace raw material workshop reduces ratio method of returning mine, which comprises the following steps:
1) be mounted with Vibration rod screen respectively in the feed inlet of two four-roller crushers, using come the coke cutting powder processed by vibrating screen
Afterwards, the grain coke on sieve greater than ten millimeters selects machine to be sent in specified feed bin by belt is defeated, then transports to stock ground to height by vehicle backing
Furnace uses, and the coke powder under sieving less than ten millimeters is crushed into people's four-roller crusher, by this measure, on the one hand makes part
Qualified grain coke directly feeds blast furnace, reduces costs, and the coke cutting powder into four-roller is on the other hand made to reach the technique requirement of production,
To solve the situation containing grain coke in processing coke powder, it is ensured that going on smoothly for four-roller processing requires post in production
Personnel clear up the coarse grain coke that vibrating screen grate bar retains come in time, keep sieve pore unimpeded, in addition suitable control coke cutting powder material issuance amount
With two roller gaps above and below timely adjustment crusher, regular turning roller, after taking the above measure, zero to three millimeter of coke powder grain institute
Accounting example is increased to 75 or more percent, provides better polity's fuel condition for sintering production, solves sintering and reach
The big problem of journey temperature deviation has further stabilized and increased the drum strength and yield of sinter；
2) in order to reach 1,100 degrees Celsius or more of firing temperature, the duration of ignition is reduced, a horizontal preheating furnace has been built up,
By combustion air and blast furnace gas by supplying sintering ignition furnace after preheating stove heating, the combustion air temperature after preheating to 300
Reach 150 to 300 degrees Celsius to 400 degrees Celsius, blast furnace gas temperature, to improve sintering ignition quality and contracting
The short duration of ignition improves sintering mineral products and quality, and as steel STEELMAKING PRODUCTION is gradually stable, coal gas of converter, which has, has more than needed,
It is incorporated to sintering system pipeline shield gaspipe line is turned, application of the coal gas of converter as igniting dyestuff in sintering is realized, improves
Before the case where being restricted sintering production by blast-furnace gas pressure and quality fluctuation, in addition coal gas of converter impurity is few, with high purity, hair
Calorific value height and ignition intensity are good, reach 1,150 degrees centigrades using firing temperature after coal gas of converter, and stablize, point
Fiery room flame friend is bright, dust is few, and uniformly, sintering feed face color is in cyan to the igniting of trolley charge level, keeps entire sintering process physico
It learns reaction and completes more abundant, sinter epigranular, return mine few, high yield rate；
3) for steel raw material mix coarse size, good permeability is opened the characteristics of, sintering material layer thickness is mentioned by original 700 millimeters
Height is to 750 millimeters, and after the bed of material improves, sintering feed skin glass matter is opposite to be reduced, and top heat supply is sufficient, bed of material high temperature dwell
It holds that the time is long, and sinter crystallizable mineral is abundant, is conducive to the improvement of sinter internal structure, meanwhile, deep bed sintering is conducive to brown iron
The crackle that generates and gap makes up and from fine and close, because auto accumulation heat acts on, further decrease burnup, produce real cross mountains after mine is decomposed
After showing that material exhibition improves, less than ten millimeters grain size contents are reduced in sinter, and sinter strength and yield rate improve, burnup drop
Low 1 point 2 kilogram per ton；
4) to mitigate edge effect to sintering bring negative effect, two groups of activity pressures are installed between distributing device and igniting chamber
Roller, a pressure roller length close to distributing device are 2 points 8 meters, and main function is to compress the bed of material in the middle part of trolley, later group pressure roller
Against the baffle of trolley, the bed of material on the inside of baffle is compressed, is acted on by the pressure of above-mentioned two groups of pressure rollers, reduces mixture
The gap of intergranular, the liquid phase convenient for generating in sintering process closely cohere mineral powder granular, improve cohesive force, also improve simultaneously
Consolidation between miberal powder, to achieve the purpose that binder；
5) to the inspection of sieve hard point and maintenance under blast furnace ore tank, sieve pore is replaced in time and wears faster sieve, otherwise for blast furnace
Sinter screen-aperture situation bigger than normal under mine slot, the sieve that equipment division is 4 points 5 millimeters using sieve pore are six instead of sieve pore
The sieve of millimeter, the portion screen by granularity in sinter return fine greater than five millimeters comes out plus people's blast furnace participates in ironmaking, to improve
Blast furnace agglomerate ratio, the low sintering energy consumption in land.
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| CN104278117A (en) * | 2014-09-24 | 2015-01-14 | 鞍钢集团工程技术有限公司 | Linear charging process for ore coke groove of blast furnace |
| CN108220588A (en) * | 2018-01-11 | 2018-06-29 | 中南大学 | A kind of method of lateritic nickel ore pressurization densification sintering |
| CN109852787A (en) * | 2018-12-05 | 2019-06-07 | 江苏永钢集团有限公司 | The production technology of the sinter of small sintering ore amount can be reduced |
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2019
- 2019-06-10 CN CN201910495283.4A patent/CN110172536A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673592A (en) * | 2013-12-27 | 2014-03-26 | 中冶长天国际工程有限责任公司 | Method and system for parallel preheating of fuel gas and combustion air for sintering ignition furnace |
| CN104278117A (en) * | 2014-09-24 | 2015-01-14 | 鞍钢集团工程技术有限公司 | Linear charging process for ore coke groove of blast furnace |
| CN108220588A (en) * | 2018-01-11 | 2018-06-29 | 中南大学 | A kind of method of lateritic nickel ore pressurization densification sintering |
| CN109852787A (en) * | 2018-12-05 | 2019-06-07 | 江苏永钢集团有限公司 | The production technology of the sinter of small sintering ore amount can be reduced |
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Application publication date: 20190827 |