CN109652643A - High quality sinter and preparation method thereof for COREX ironmaking technique of fusion and reduction - Google Patents
High quality sinter and preparation method thereof for COREX ironmaking technique of fusion and reduction Download PDFInfo
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- CN109652643A CN109652643A CN201910091107.4A CN201910091107A CN109652643A CN 109652643 A CN109652643 A CN 109652643A CN 201910091107 A CN201910091107 A CN 201910091107A CN 109652643 A CN109652643 A CN 109652643A
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- 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
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- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
Abstract
The sinter and preparation method thereof that the present invention provides a kind of for COREX ironmaking technique of fusion and reduction, the solid fuel that the iron ore concentrate of 30-50% and the flux 1 of 4-7% and 1.0-1.5% are distributed from iron ore concentrate total amount carries out ingredient, is made in fluxed after mixing with carbon green pellets；It by iron ore concentrate remaining after shunting and iron-bearing auxiliary material, returns mine, flux 2 and solid fuel progress ingredient, obtains mixture after mixing；Gained green pellets and mixture are subjected to mixing granulation, cloth, igniting, sintering, cooling, broken and screening again, sinter is obtained and returns mine.Sinter prepared by the above method is able to satisfy COREX shaft furnace to sinter low temperature reduction degradation value RDI when basicity is 1.8+6.3>=50% requirement, and sinter charge quality ratio can be greater than 50%, and the cost of iron-smelting furnace charge can be effectively reduced.
Description
Technical field
The present invention relates to field of steel metallurgy, in particular to a kind of high quality for COREX ironmaking technique of fusion and reduction
Sinter and preparation method thereof.
Background technique
COREX be by Voestalpine exploitation it is a kind of make raw material using lump ore or pellet, make reducing agent using mill coal and
The ironmaking technique of fusion and reduction of fuel.COREX technique is a kind of currently the only iron making by smelting reduction ironworker for realizing industrialized production
Skill uses mill coal as the main disposable energy and reducing agent, and a small amount of coke is only used only, and can produce and blast furnace ironmaking
The comparable molten iron of quality greatly reduces dependence of the iron-smelting process to high-quality metallurgical coke, have briquet replacing coke, process it is short, to ring
The features such as border pollution is small meets the strategy of sustainable development requirement of China's steel and iron industry.Rich coal resources in China, mill coal storage
Measure it is huge, develop COREX smelting reduction technology have congenital energy advantages.But the furnace charge of COREX ironmaking system is mainly ball
Nodulizing and lump ore, and China's pellet production capacity is limited, high-quality lump ore scarcity of resources.Therefore, China is developing COREX melting and reducing
When technique, the burden structure in external industrial production is continued to use, it is necessary to which outsourcing pelletizing or self-built pelletizing plant substantially increase COREX
The cost of material of technique.On the other hand, sinter production capacity is chronically at superfluous state, existing capacity resources in Iron and Steel Enterprises in China
It is not fully utilized.Sinter is largely used in COREX technique, can not only be reduced iron-smelting raw material cost, be promoted the technique
Development in China, while the existing sinter capacity resources distribution of Iron and Steel Enterprises in China can be optimized.With pellet, lump ore phase
Than the reducing property of sinter is preferable, and reduction degradation performance is then poor.According to existing knowhow, in COREX ironmaking system
When using sinter, low temperature reduction degradation index of the strict control sinter in COREX shaft furnace is answered.Improve the low temperature of sinter also
Former powder performance can be reduced percentage of damage and pulverization rate that sinter occurs when low-temperature region restores in COREX shaft furnace, improve
The gas permeability of stock column in COREX shaft furnace, that improves sinter enters furnace ratio.
Adjusting Sinter Component using the method for ore matching is considered as a kind of raising sinter low-temperature reduction powder in blast furnace
The effective ways of change, but limited by factors such as resources supplIes, ore matching costs, it is difficult to it promotes and applies；Currently, in the industrial production,
The low-temperature reduction that most enterprises inhibit sinter in blast furnace using certain density chloride is sprayed to agglomerate surface
Dusting has received good effect.But the chloride for bringing blast furnace into brings furnace wall damage, pipeline rotten to blast furnace process simultaneously
The problems such as erosion and exhaust emission aggravation.
Chinese patent CN103409616A disclose it is a kind of inhibit iron ore sintering mine low temperature reduction degradation method, pass through by
Iron ore concentrate be prepared into granularity be 3mm-15mm granulation material, then with sinter mixture mix, then cloth, bake with agglomeration；Pass through
The dosage of solid fuel dosage and flux in a small amount of flux or solid fuel, optimization sinter mixture, drop are added in granulation material
Low frit roasts suction pressure and sinter cooling velocity, so that the low temperature reduction degradation of sinter is suppressed, can effectively change
The technical-economic index of kind blast furnace process.
Currently, the document of open report is directed to blast furnace ironmaking system, there is no both at home and abroad directly to for COREX work
The technical research of the low reduction and pulverization ratio sinter preparation of skill or industrial report.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of for the high-quality of COREX ironmaking technique of fusion and reduction
Measure sinter and preparation method thereof, it is therefore an objective to be sintered based on domestic iron ore concentrate, prepare with good quality index and
It is higher enter furnace ratio sinter, and its low-temperature reduction disintegration in COREX shaft furnace is made to be able to satisfy requirement.
In order to achieve the above object, the technical scheme is that
A kind of preparation method of the high quality sinter for COREX ironmaking technique of fusion and reduction, includes the following steps:
1) preparation of green pellets
The iron ore concentrate that 30-50% is distributed from iron ore concentrate total amount, by the flux 1 of the smart iron ore and 4-7% and
The solid fuel of 1.0-1.5% carries out ingredient, and green pellets is made after mixing；
Wherein, flux 1 includes quick lime, further includes one of lime stone, dolomite, magnesite or serpentine or more
Kind；
2) preparation of mixture
By iron ore concentrate remaining after shunting and iron-bearing auxiliary material, return mine, flux 2 and solid fuel by mass parts ratio are
(50-60): 5:(25-30): (16-29): (4-8) carries out ingredient, obtains mixture after mixing；
Wherein, the iron-bearing auxiliary material is one of steel mill's iron dust containing, iron content pelletizing and minus sieve containing iron ore or more
Kind；Flux 2 includes lime stone, further includes one of quick lime, dolomite, magnesite or serpentine or a variety of；
3) preparation of sinter
Green pellets obtained by step 1) is mixed and pelletized with mixture obtained by step 2) again, obtains granulation material；To institute
The material that must pelletize carries out cloth, igniting, sintering, cooling, broken and screening process, obtains sinter and returns mine；Wherein, gained is returned mine
Return step 2) it continues to use.
Preferably, iron content is greater than 62.5% in the iron ore concentrate；Less than 0.074mm's in the iron ore concentrate granularity
Grade mass content is greater than 40%.
Preferably, the solid fuel includes coke powder or anthracite.
Preferably, the basicity of green pellets described in step 1) is 0.8-1.2；The mass fraction of MgO is in the green pellets
1.2-1.8%.
Preferably, the diameter of green pellets described in step 1) is 8-20mm.
The present invention also provides a kind of sinters for COREX ironmaking technique of fusion and reduction, and the sinter is by above-mentioned
A kind of method of anticipating is prepared.
Preferably, the partial size of the sinter is 5-40mm；The basicity of the sinter is 1.6-2.0；The sinter
The content of middle MgO is 1.6-2.1%.
Preferably, COREX shaft furnace is able to satisfy to sinter low-temperature reduction when the sinter charge quality ratio is higher than 50%
The requirement of powder performance.
In conventional sintering process, sinter basicity is greater than 1.8.Sinter basicity is higher, and sinter strength is higher, reduction
Better, the low temperature reduction degradation index DRI of property+6.3And RDI+3.15Value it is higher, yield is higher, be more conducive to subsequent smelting procedure,
For molten iron production cost with regard to low, fuel consumption is just few.When sinter basicity is lower than 1.2, belong to acid sinter ore, basicity is low, burns
It ties mine intensity to increase, low-temperature reduction disintegration can improve, but energy consumption is high, low output.Sinter basicity in 1.4-1.6 intensity and
Low-temperature reduction disintegration can be worst.Therefore, in order to smelt iron sinter for COREX technique, using conventional sintering process
When, sinter basicity have to be larger than 2.4 and content of MgO be greater than 2.4%, sinter strength and low-temperature reduction disintegration are just able to satisfy
It is required that and it enters furnace ratio only 20% or so at this time.Sinter basicity and the height of content of MgO are limited by subsequent smelting, sintering
Mine basicity and content of MgO are higher, and the use ratio in subsequent smelting is lower.In order to reduce molten iron production cost, it is desirable to
Sinter use ratio is improved in subsequent smelting, must just be reduced sinter basicity and content of MgO, necessarily be led to sinter strength
It is deteriorated, low temperature reduction degradation index DRI+6.3And RDI+3.15Decline, won't does influence to subsequent smelting molten iron band, leads to hot metal output
Decline, energy consumption rise.Therefore, its intensity and reproducibility, low-temperature reduction when sinter basicity and content of MgO reduce how to be solved
Powder performance index remains unchanged substantially, so that ratio of the sinter in subsequent smelting process can be improved, improves business economic
Benefit is of great significance.
Above scheme of the invention have it is following the utility model has the advantages that
(1) to may be implemented superelevation ratio using method provided by the invention iron ore concentrate sintered, even complete iron ore concentrate sintered,
More reasonably utilize the self-produced iron ore concentrate resource of Iron and Steel Enterprises in China.Part iron ore concentrate is diverted in disc balling machine by this method
Pelletizing is carried out, the green-ball with 8-20mm is prepared into, still routinely sintering process is handled other sintering deposit raw materials, after one is mixed and raw
Ball mixing carries out two and is blended grain, improves the gas permeability of sinter bed, significantly improves vertical sintering speed and usage factor, overcomes
The problem of bed permeability is poor when full concentrate sintering in conventional sintering technique, Sintering Operation Index index error.
(2) method provided by the invention is used, in the case where being sintered mineral products totality basicity and content of MgO is stablized, is led to
It crosses and adds a small amount of flux (quick lime, lime stone and dolomite) and solid fuel into shunting iron ore concentrate, green-ball basicity is controlled
Within the scope of fluxed pellets, content of MgO properly increase, to improve the intensity of pellet part, improve the low of nodulizing part
Warm reduction degradation performance；The mixture basicity of conventional sintering process processing part is improved, content of MgO decline, burns this part
Knot mine intensity increases, low-temperature reduction disintegration can improve.Make the mineral composition of final finished sinter and micro- by the above measure
Seeing structure is improved, and is ultimately formed the good embedding cloth of pellet of intensity high and low temperature reduction degradation performance and is restored in intensity high and low temperature
Embedded structure in the good sinter of powder performance, so that final finished product sinter strength is increased, low temperature reduction degradation
Value DRI+6.3And RDI+3.15It increases.Finished product sinter prepared by the present invention is used to can satisfy COREX shaft furnace when basicity is 1.8
To sinter low temperature reduction degradation value RDI+6.3>=50%, RDI+3.15>=70% requirement, and can ensure that sinter is refined in COREX
When the mass percent of iron-containing charge reaches 50% or more in iron series system, reducing gas rises unobstructed, furnace in COREX shaft furnace at this time
Expect prereduction reaction sufficiently, shaft furnace runs smoothly, and reduces iron-smelting furnace charge cost.Meanwhile considerably reducing COREX ironmaking work
Dependence of the skill to coke is the significant development to the blast furnace technology of heavy dependence coke oven ironmaking.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
Comparative example 1
When sinter basicity control is in 1.8, content of MgO control 1.3%, when routinely sintering process prepares sinter,
It by iron ore concentrate and iron-bearing auxiliary material (including steel mill's iron dust containing and iron content pelletizing) and returns mine, quick lime, lime stone and white clouds first
Stone and solid fuel (coal dust) weighed by following mass fraction (95:5:30:4:6:6:7), ingredient, meets subsequent smelting pair
The requirement of sinter chemical analysis, then carries out mixed once (mixing), secondary mixing (granulation) by conventional sintering technique requirement, most
The granulation cloth of material, igniting, sintering, cooling, whole grain screening are carried out on sintering machine afterwards, preparing finished product sinter, (partial size is
5-40mm) and return mine (- 5mm).In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure
12kPa, cooling negative pressure 5kPa are sintered under conditions of cooling time 5min.Gained sinter yield rate is 69.60%, is turned
Drum intensity is 57.60%, and usage factor (yield) is 1.40tm-2·h-1, solid burnup 35.02kgt-1, COREX is perpendicular
Furnace low-temperature reduction disintegration energy RDI+6.3For 23.32%, RDI+3.15It is 57.91%.In basicity 1.8, sinter strength is poor, benefit
It is low with coefficient, low-temperature reduction disintegration energy RDI+6.3And RDI+3.15It is far below and requires index.
Comparative example 2
When sinter basicity control is in 2.0, content of MgO control 1.5%, when routinely sintering process prepares sinter,
It by iron ore concentrate and iron-bearing auxiliary material (including steel mill's iron dust containing and iron content pelletizing) and returns mine, quick lime, lime stone and white clouds first
Stone and solid fuel (coke powder) weighed by certain mass score (92:5:30:4:8:7:7), ingredient, meets subsequent smelting pair
The requirement of sinter chemical analysis, then carries out mixed once (mixing), secondary mixing (granulation) by conventional sintering technique requirement, most
Cloth, the igniting, sintering, cooling, whole grain screening for carrying out granulation material on sintering machine afterwards, prepare finished product sinter and return mine
(partial size is less than 5mm).In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure 12kPa,
It is sintered under conditions of cooling negative pressure 5kPa, cooling time 5min.Gained sinter yield rate is 71.36%, drum strength
It is 60.24%, usage factor 1.57tm-2·h-1, solid burnup 37.02kgt-1, COREX shaft furnace low-temperature reduction powder
Change performance RDI+6.3For 41.56%, RDI+3.15It is 64.78%.In basicity 2.0, sinter strength and the aobvious raising of yield.With it is right
Ratio 1 is compared, sinter performance indexes be improved significantly.But low-temperature reduction disintegration energy RDI+6.3And RDI+3.15
It is far below and requires index.
Comparative example 3
When sinter basicity control is in 2.4, content of MgO control 2.0%, when routinely sintering process prepares sinter,
It by iron ore concentrate and iron-bearing auxiliary material (including steel mill's iron dust containing) and returns mine, quick lime, lime stone, dolomite and solid fuel first
(coal dust) by a certain percentage (90:5:30:4:10:8:6) weighed, ingredient, meet subsequent smelting to sinter chemical analysis
It is required that mixed once (mixing), secondary mixing (granulation) then are carried out by conventional sintering technique requirement, it is finally enterprising in sintering machine
The cloth of row granulation material, igniting, sintering, cooling, whole grain screening prepare finished product sinter and return mine (partial size is less than 5mm).?
Sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min are sintered negative pressure 12kPa, cooling negative pressure 5kPa, cooling
It is sintered under conditions of time 5min.Gained sinter yield rate is 73.36%, drum strength 65.24%, usage factor
For 1.63tm-2·h-1, solid burnup 38.01kgt-1, COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For
56.23%, RDI+3.15It is 70.32%.In basicity 2.4, sinter strength and yield are further increased, low-temperature reduction disintegration
It can RDI+6.3And RDI+3.15Reach requirement index.It is calculated according to subsequent smelting burden structure, at this point, basicity is 2.5
The mass percent that sinter enters furnace is 30%.Compared with comparative example 1,2, only basicity is increased to 2.4 and content of MgO control
When 2.0%, low-temperature reduction disintegration energy RDI+6.3And RDI+3.15Reach requirement index, but its charge quality is than being only 30%.
Comparative example 4
When sinter basicity control is in 2.6, content of MgO control 2.4%, when routinely sintering process prepares sinter,
It by iron ore concentrate and iron-bearing auxiliary material (including steel mill's iron dust containing, iron content pelletizing and minus sieve containing iron ore) and returns mine first, give birth to stone
Ash, lime stone, dolomite and solid fuel (coke powder) in proportion (88:5:30:4:11:10:5) weighed, ingredient, after satisfaction
It is continuous to smelt to the requirement of sinter chemical analysis, then mixed once (mixing), secondary mixing are carried out by conventional sintering technique requirement
(granulation) finally carries out cloth, the igniting, sintering, cooling, whole grain screening of granulation material on sintering machine, prepares finished product sintering
Mine and return mine (partial size is less than 5mm).In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative
It presses 12kPa, is sintered under conditions of cooling negative pressure 5kPa, cooling time 5min.Gained sinter yield rate is 69.25%,
Drum strength is 65.27%, usage factor 1.43tm-2·h-1, solid burnup 36.56kgt-1, COREX shaft furnace is low
Warm reduction degradation performance RDI+6.3For 62.18%, RDI+3.15It is 80.64%.In basicity 2.4, sinter strength and yield into
One step improves, low-temperature reduction disintegration energy RDI+6.3And RDI+3.15Reach requirement index.According to subsequent smelting burden structure into
Row calculates, at this point, the mass percent that the sinter that basicity is 2.5 enters furnace is 25%.
Compare comparative example 1-4 as it can be seen that preparing sinter using conventional sintering process, improve sinter basicity and content of MgO,
Sinter strength and yield can be improved, improve sinter low-temperature reduction disintegration energy.Since basicity and content of MgO are in sinter
In be uniformly distributed, sinter basicity is only increased to 2.4-2.6, when content of MgO is increased to 2.0-2.4%, sinter low temperature
Reduction degradation value RDI+6.3And RDI+3.15It is just able to satisfy subsequent smelting and requires (RDI+6.3>=50%, RDI+3.15>=70%), and
When sinter charge quality percentage should control in 25-30%, the balance of basicity of slag and content of MgO could be maintained.Therefore,
Using conventional sintering process, it only cannot reach raising sinter charge quality ratio by improving sinter basicity and content of MgO, reduce
The purpose of molten iron production cost.
Embodiment 1
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.6%.In iron ore concentrate total amount 30% iron ore concentrate is diverted, is added accounts for the smart iron ore 2.5% of shunting gained thereto
Fine grinding quick lime, 4% dolomite and 1.4% solid fuel (coke powder) carry out ingredient, mix, obtain mixture 1, wherein
Iron ore concentrate granularity -0.074mm > 40%, iron content are greater than 62.5%.Mixture 1 is made in disc balling machine is directly
The green-ball of 8mm-20mm, green-ball basicity (CaO and SiO2The ratio of mass percent) it is 1.0, content of MgO 1.8%, solid combustion
Expect that mass ratio is 1.4%.
By 70% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (including steel mill's iron dust containing, iron content pelletizing) with return
Mine, quick lime, lime stone, dolomite and solid fuel are weighed by following mass fraction (60:5:28:3:10:3:7), are matched
Material, and mixed once processing is carried out by conventional sintering technique, obtain mixture 2.
Then green-ball and mixture 2 are subjected in trommel mixer second of mixing granulation, obtain granulation material, finally will
Granulation material carries out cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sinter (partial size 5-
40mm) and return mine (partial size is less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure 12kPa, cooling negative
Press 5kPa, cooling time 5min.Gained sinter yield rate is 70.05%, drum strength 66.29%, and usage factor is
1.53t·m-2·h-1, solid burnup 34.56kgt-1, COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For
69.36%, RDI+3.15It is 75.64%.
Compared with comparative example 3-4,1.8, content of MgO is dropped to by 2.4-2.6 in sinter basicity and is declined by 2.0-2.4%
When to 1.6%, not only sinter strength is high, low-temperature reduction disintegration energy RDI+6.3Greater than 50%, RDI+3.15Greater than 70%；It is remote excellent
In the performance indexes of comparative example 1-2.And enters furnace ratio and can be increased to 50% by 25-30%.
Embodiment 2
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.6%.In iron ore concentrate total amount 50% iron ore concentrate is diverted, is added accounts for the smart iron ore 3% of shunting gained thereto
Fine grinding quick lime, 3.5% dolomite and 1.2% solid fuel (anchracite duff) carry out ingredient, mix, and obtain mixture 1,
Wherein iron ore concentrate granularity -0.074mm > 40%, iron content are greater than 62.5%.Mixture is made directly in disc balling machine
For 8mm-20, green-ball basicity is 1.2, content of MgO 1.7%, solid fuel mass ratio is 1.2%.
By 50% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (including steel mill's iron dust containing, iron content pelletizing) with return
Mine, quick lime, lime stone, dolomite and solid fuel are weighed and are matched by following mass fraction (50:5:30:3:15:5:6)
Material, and mixed once processing is carried out by conventional sintering technique, obtain mixture 2.
Then green pellets and mixture 2 are mixed, carries out mixing granulation in trommel mixer by conventional sintering technique, obtains
Expect to granulation, then granulation material is subjected to cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sintering
Mine (partial size 5-40mm) and return mine (partial size be less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min, sinter bed height 700mm are burnt
It ties negative pressure 12kPa, is sintered under conditions of cooling negative pressure 5kPa, cooling time 5min, gained sinter yield rate is
70.26%, drum strength 60.60%, usage factor 1.60tm-2·h-1, solid burnup 35.06kgt-1,
COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For 56.67%, RDI+3.15It is 75.69%.
Compared with Example 1, it is increased to 50% by 30% due to shunting iron ore concentrate ratio, green-ball ratio increases in granulation material
Add, material grain partial size increases, and permeability of sintering material bed improves, and Sintering Yield improves, and usage factor increases, under sinter strength
Drop, but low-temperature reduction disintegration energy RDI+6.3And RDI+3.15It remains to reach required value, the sinter of preparation remains to do subsequent
CCOREX iron-smelting process furnace charge.
Compared with comparative example 3-4,1.8, content of MgO is dropped to by 2.4-2.6 in sinter basicity and is declined by 2.0-2.4%
When to 1.6%, not only sinter strength is high, low-temperature reduction disintegration energy RDI+6.3Greater than 50%, RDI+3.15Greater than 70%, it is better than
Comparative example 3-4, the farther performance indexes better than comparative example 1-2.And enters furnace ratio and can be increased to 50% by 25-30%.
Embodiment 3
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.6%.In iron ore concentrate total amount 60% iron ore concentrate is diverted, is added accounts for the smart iron ore 2% of shunting gained thereto
Fine grinding quick lime, 2.5% magnesite and 1.4% solid fuel (coke powder) carry out ingredient, mix, and obtain mixture 1, wherein iron essence
Ore particle degree -0.074mm > 40%, iron content are greater than 62.5%.Mixture is made directly in disc balling machine as 8mm-
The green-ball of 20mm, green-ball basicity are 0.8, and content of MgO 1.0%, solid fuel mass ratio is 1.4%.
By 40% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (including steel mill's iron dust containing, iron content pelletizing and iron content
Lump ore minus sieve) with return mine, quick lime, lime stone, serpentine and fuel are by following mass fraction (50:5:28:3:19:5:4)
Weighing and ingredient are carried out, and carries out mixed once processing by conventional sintering technique, obtains mixture 2.
Then green pellets and mixture 2 are mixed, carries out mixing granulation in trommel mixer by conventional sintering technique, obtains
Expect to granulation, then granulation material is subjected to cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sintering
Mine (partial size 5-40mm) and return mine (partial size be less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min, sinter bed height 700mm are burnt
It ties negative pressure 12kPa, is sintered under conditions of cooling negative pressure 5kPa, cooling time 5min, gained sinter yield rate is
68.79%, drum strength 57.89%, usage factor 1.45tm-2·h-1, solid burnup 38.56kgt-1,
COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For 47.67%, RDI+3.15It is 68.34%.
Compared with embodiment 1 and embodiment 2, it is increased to 60% by 30% and 50% due to shunting iron ore concentrate ratio, system
Green-ball ratio further increases in pellet, and material grain partial size is excessive, and permeability of sintering material bed is very good, causes sintering velocity too fast, burns
Knot mineral products amount and intensity decline.And low-temperature reduction disintegration energy RDI+6.3And RDI+3.15It is decreased obviously, cannot meet the requirements.
Compared with comparative example 3-4,1.8, content of MgO is dropped to by 2.4-2.6 in sinter basicity and is declined by 2.0-2.4%
When to 1.6%, since shunt ratio is up to 60%, not only sinter strength and yield decline, but also low-temperature reduction disintegration energy
RDI+6.3And RDI+3.15Although being apparently higher than comparative example, it is not able to satisfy into furnace requirement.Therefore, when iron ore concentrate shunt ratio reaches
When 60%, obtained sinter cannot enter furnace.
Embodiment 4
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.6%.In iron ore concentrate total amount 15% iron ore concentrate is diverted, is added accounts for the smart iron ore 2% of shunting gained thereto
Fine grinding quick lime, 2% dolomite and 1.4% solid fuel (coke powder) carry out ingredient, mix, and obtain mixture 1, wherein iron
Granularity of concentrate -0.074mm > 40%, iron content are greater than 62.5%.Mixture is made directly in disc balling machine as 8mm-
The green-ball of 20mm, green-ball basicity are 0.6, and content of MgO 0.8%, solid fuel mass ratio is 1.4%.
By 85% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (including iron content pelletizing and minus sieve containing iron ore) with
It returns mine, quick lime, lime stone, serpentine and fuel are weighed and matched by following mass fraction (55:5:29:3:16:8:8)
Material, and mixed once processing is carried out by conventional sintering technique, obtain mixture 2.
Then green pellets and mixture 2 are mixed, carries out mixing granulation in trommel mixer by conventional sintering technique, obtains
Expect to granulation, then granulation material is subjected to cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sintering
Mine (partial size 5-40mm) and return mine (partial size be less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min, sinter bed height 700mm are burnt
It ties negative pressure 12kPa, is sintered under conditions of cooling negative pressure 5kPa, cooling time 5min, gained sinter yield rate is
67.21%, drum strength 59.93%, usage factor 1.40tm-2·h-1, solid burnup 38.56kgt-1,
COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For 29.21%, RDI+3.15It is 66.16%.
Compared with embodiment 1- embodiment 3, it is reduced to 15% by 30%-60% due to shunting iron ore concentrate ratio, granulation material
Middle green-ball ratio is relatively low, and material grain partial size is less than normal, and permeability of sintering material bed is bad, and sintering velocity is caused to be decreased obviously, and is sintered mineral products
Amount and intensity decline.And low-temperature reduction disintegration energy RDI+6.3And RDI+3.15Also it is decreased obviously, cannot meet the requirements.
Compared with comparative example 3-4,1.8, content of MgO is dropped to by 2.4-2.6 in sinter basicity and is declined by 2.0-2.4%
When to 1.6%, since shunt ratio is relatively low, not only sinter strength, yield are decreased obviously, but also low-temperature reduction disintegration energy
RDI+6.3And RDI+3.15Slightly above comparative example, but be not able to satisfy into furnace requirement.Therefore, when iron ore concentrate shunt ratio is as low as 15%
When, obtained sinter cannot enter furnace.
To sum up embodiment 1-4 is as it can be seen that the shunt ratio that iron ore concentrate is suitable for should be controlled in 30-50%.
Embodiment 5
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.8%.In iron ore concentrate total amount 30% iron ore concentrate is diverted, is added accounts for the smart iron ore 2.5% of shunting gained thereto
Fine grinding quick lime, 2.7% lime stone and 0.6% solid fuel (anchracite duff) carry out ingredient, mix, obtain mixture
1, wherein iron ore concentrate granularity -0.074mm > 40%, iron content are greater than 62.5%.Mixture 1 is made in disc balling machine
It is directly the green-ball of 8mm-20mm, green-ball basicity is 1.0, and content of MgO 1.3%, solid fuel mass ratio is 0.6%.
By 70% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (iron content pelletizing) with return mine, it is quick lime, lime stone, white
Marble and solid fuel carry out weighing and ingredient by following mass fraction (60:5:29:3:14:7:6), and press conventional sintering technique
Mixed once processing is carried out, mixture 2 is obtained.
Then green-ball and mixture 2 are subjected in trommel mixer second of mixing granulation, obtain granulation material, finally will
Granulation material carries out cloth, igniting, sintering, cooling, broken, screening on sintering machine, and obtaining finished product sinter, (partial size is less than 5-
40mm) and return mine (partial size 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure 12kPa, cooling negative
Press 5kPa, cooling time 5min.Gained sinter yield rate is 69.70%, drum strength 57.52%, and usage factor is
1.62t·m-2·h-1, solid burnup 36.16kgt-1, COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For
41.20%, RDI+3.15It is 71.32%.
Compared with Example 1, since in iron ore concentrate total amount 30% iron ore concentrate is diverted made of the mixture 1 of composition
Solid fuel ratio drops to 0.6% by 1.4% in green-ball, and content of MgO drops to 1.3% by 1.8%, leads to ball in sinter
Group's partial heat is inadequate, so that Sintering Yield and intensity decline.The decline of solid fuel proportion, ferrous oxide content in green-ball
It reduces, low-temperature reduction disintegration can be deteriorated.Finally it is embodied in the intensity and low-temperature reduction disintegration energy of sintering mineral products
RDI+6.3And RDI+3.15Also it is decreased obviously, cannot meet the requirements.
Embodiment 6
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.8%.In iron ore concentrate total amount 30% iron ore concentrate is diverted, is added accounts for the smart iron ore 2.5% of shunting gained thereto
Fine grinding quick lime, 3.0% serpentine and 1.0% solid fuel (anchracite duff) carry out ingredient, mix, obtain mixture
1, wherein iron ore concentrate granularity -0.074mm > 40%, iron content are greater than 62.5%.Mixture 1 is made in disc balling machine
It is directly the green-ball of 8mm-20mm, green-ball basicity is 1.0, and content of MgO 1.5%, solid fuel mass ratio is 1.0%.
By 70% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (including steel mill's iron dust containing and containing under iron ore sieve
Powder) with return mine, quick lime, lime stone, magnesite and solid fuel are carried out by following mass fraction (60:5:29:3:13:7:7)
Weighing and ingredient, and mixed once processing is carried out by conventional sintering technique, obtain mixture 2.
Then green-ball and mixture 2 are subjected in trommel mixer second of mixing granulation, obtain granulation material, finally will
Granulation material carries out cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sinter (partial size 5-
40mm) and return mine (partial size is less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure 12kPa, cooling negative
Press 5kPa, cooling time 5min.Gained sinter yield rate is 70.25%, drum strength 60.68%, and usage factor is
1.59t·m-2·h-1, solid burnup 37.16kgt-1, COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For
50.20%, RDI+3.15It is 73.32%.
Compared with Example 1, since in iron ore concentrate total amount 30% iron ore concentrate is diverted made of the mixture 1 of composition
Solid fuel ratio drops to 1.0% by 1.4% in green-ball, and content of MgO drops to 1.5% by 1.8%, leads to ball in sinter
Group's partial heat is inadequate, so that Sintering Yield and intensity decline.The decline of solid fuel proportion, ferrous oxide content in green-ball
It reduces, low-temperature reduction disintegration can be deteriorated.Finally it is embodied in the intensity and low-temperature reduction disintegration energy of sintering mineral products
RDI+6.3And RDI+3.15Decline, but can also meet the requirements.
Compared with Example 5, solid fuel ratio by 0.6% is increased to 1.0% in green-ball, and content of MgO is improved by 1.3%
To 1.5%, green-ball sintering institute's calorific requirement is increased, while being conducive to improve the ferrous oxide content of pelletizing, therefore, be sintered mineral products
The intensity and low-temperature reduction disintegration energy RDI of product+6.3And RDI+3.15Improved.
Embodiment 7
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 1.8%.In iron ore concentrate total amount 30% iron ore concentrate is diverted, is added accounts for the smart iron ore 2% of shunting gained thereto
Fine grinding quick lime, 3% dolomite and 1% solid fuel (coke powder) carry out ingredient, mix, and obtain mixture 1, wherein iron essence
Ore particle degree -0.074mm > 40%, iron content are greater than 62.5%.Mixture 1 is made directly as 8mm- in disc balling machine
The green-ball of 20mm, green-ball basicity are 0.8, and content of MgO 1.5%, solid fuel mass ratio is 1.0%.
70% iron ore concentrate in iron ore concentrate total amount and iron-bearing auxiliary material (including iron dust containing, iron content pelletizing and are contained into iron ore
Minus sieve) with return mine, quick lime, lime stone, dolomite and solid fuel are by following mass fraction (60:5:27:3:16:7:6)
Weighing and ingredient are carried out, and carries out mixed once processing by conventional sintering technique, obtains mixture 2.
Then green-ball and mixture 2 are subjected in trommel mixer second of mixing granulation, obtain granulation material, finally will
Granulation material carries out cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sinter (partial size 5-
40mm) and return mine (partial size is less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure 12kPa, cooling negative
Press 5kPa, cooling time 5min.Gained sinter yield rate is 69.29%, drum strength 58.68%, and usage factor is
1.45t·m-2·h-1, solid burnup 38.19kgt-1, COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For
46.23%, RDI+3.15It is 68.33%.
Compared with Example 1, when green-ball basicity by 1.0 drop to 0.8 and content of MgO by 1.8% drop to 1.5%,
When other conditions are constant, sinter strength decline, low-temperature reduction disintegration energy RDI+6.3And RDI+3.15It cannot meet the requirements.
As it can be seen that the desired solid fuel ratio in green-ball is 1.0-1.4%, basicity is by integrated embodiment 1 and embodiment 4-7
1.0-1.2, content of MgO 1.2-1.8% shunt sinter strength and low-temperature reduction disintegration energy index that pelletizing is sintered
It is able to satisfy the requirement of subsequent smelting.
Embodiment 8
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 2.1%.In iron ore concentrate total amount 30% iron ore concentrate is diverted, is added accounts for the smart iron ore 3% of shunting gained thereto
Fine grinding quick lime, 2.8% dolomite and 1% solid fuel (anchracite duff) carry out ingredient, mix, and obtain mixture 1,
Middle iron ore concentrate granularity -0.074mm > 40%, iron content are greater than 62.5%.Mixture 1 is made directly in disc balling machine
For the green-ball of 8mm-20mm, green-ball basicity is 1.2, and content of MgO 1.5%, solid fuel mass ratio is 1.0%.
By account for all iron-bearing material percentages 70% iron ore concentrate and iron-bearing auxiliary material (including iron dust containing, iron content pelletizing and
Minus sieve containing iron ore) with return mine, quick lime, lime stone, serpentine and fuel by following mass fraction (57:5:30:3:14:
Weighing and burden 9:6) is carried out, and carries out mixed once processing by conventional sintering technique, obtains mixture 2.
Then green pellets and mixture 2 are mixed, carries out mixing granulation in trommel mixer by conventional sintering technique, obtains
Expect to granulation, then granulation material is subjected to cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sintering
Mine (partial size 5-40mm) and return mine (partial size be less than 5mm).In sinter bed height 700mm, firing temperature 1100, the duration of ignition
1.5min, is sintered negative pressure 12kPa, cooling negative pressure 5kPa, is sintered under conditions of cooling time 5min.Gained sinter finished product
Rate is 70.06%, drum strength 58.60%, usage factor 1.72tm-2·h-1, solid burnup 37.40kgt-1,
COREX shaft furnace low-temperature reduction disintegration energy RDI+6.3For 67.62%, RDI+3.15It is 85.45%.
Compared with embodiment 1, embodiment 2, when sinter totality content of MgO is increased to 2.1% by 1.6%, sinter
Intensity decline is more, but low-temperature reduction disintegration energy index makes moderate progress, and is much better than index of correlation requirement, is able to satisfy and wants into furnace
It asks.
Embodiment 9
Requirement according to subsequent smelting to furnace sinter quality percentage 50% is entered, design sinter basicity are 1.8, MgO
Content 2.1%.In iron ore concentrate total amount 30% iron ore concentrate is diverted, is added accounts for the smart iron ore 3% of shunting gained thereto
Fine grinding quick lime, 3.5% dolomite and 1.5% solid fuel (anchracite duff) carry out ingredient, mix, and obtain mixture 1,
Wherein iron ore concentrate granularity -0.074mm > 40%, iron content are greater than 62.5%.Mixture 1 is made directly in disc balling machine
It is connected in the green-ball of 8mm-20mm, green-ball basicity is 1.2, and content of MgO 1.7%, solid fuel mass ratio is 1.5%.
By account for all iron-bearing material percentages 70% iron ore concentrate and iron-bearing auxiliary material (including iron dust containing, iron content pelletizing and
Minus sieve containing iron ore) with return mine, quick lime, lime stone, dolomite and fuel by following mass fraction (60:5:26:3:14:
Weighing and burden 10:6) is carried out, and carries out mixed once processing by conventional sintering technique, obtains mixture 2.
Then green pellets and mixture 2 are mixed, carries out mixing granulation in trommel mixer by conventional sintering technique, obtains
Expect to granulation, then granulation material is subjected to cloth, igniting, sintering, cooling, broken, screening on sintering machine, obtains finished product sintering
Mine (partial size 5-40mm) and return mine (partial size be less than 5mm).
In sinter bed height 700mm, firing temperature 1100, duration of ignition 1.5min is sintered negative pressure 12kPa, cooling negative
5kPa is pressed, is sintered under conditions of cooling time 5min.Gained sinter yield rate is 70.10%, and drum strength is
59.20%, usage factor 1.70tm-2·h-1, solid burnup 38.85kgt-1, COREX shaft furnace low temperature reduction degradation
Performance RDI+6.3For 69.62%, RDI+3.15It is 87.45%.
Compared with embodiment 8 and embodiment 1, when sinter totality content of MgO is increased to 2.1% by 1.6%, in green-ball
Content of MgO accordingly increase, it is necessary to the fuel ratio in green-ball is improved, so that the sintering temperature of pelletizing is improved, so as to improve it
Intensity and low-temperature reduction disintegration energy.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of preparation method of the high quality sinter for COREX ironmaking technique of fusion and reduction, which is characterized in that including such as
Lower step:
1) preparation of green pellets
The iron ore concentrate that 30-50% is distributed from iron ore concentrate total amount, by the flux 1 and 1.0- of the smart iron ore and 4-7%
1.5% solid fuel carries out ingredient, and green pellets is made after mixing；
Wherein, the flux 1 includes quick lime, further includes one of lime stone, dolomite, magnesite or serpentine or more
Kind；
2) preparation of mixture
By iron ore concentrate remaining after shunting and iron-bearing auxiliary material, return mine, flux 2 and solid fuel by mass parts ratio are (50-
60): 5:(25-30): (16-29): (4-8) carries out ingredient, obtains mixture after mixing；
Wherein, the iron-bearing auxiliary material is one of steel mill's iron dust containing, iron content pelletizing and minus sieve containing iron ore or a variety of；Institute
Stating flux 2 includes lime stone, further includes one of quick lime, dolomite, magnesite or serpentine or a variety of；
3) preparation of sinter
Green pellets obtained by step 1) is mixed and pelletized with mixture obtained by step 2) again, obtains granulation material；To gained system
Pellet carries out cloth, igniting, sintering, cooling, broken and screening process, obtains sinter and returns mine；Wherein, gained is returned mine return
Step 2) continues to use.
2. preparation method according to claim 1, which is characterized in that iron content is greater than 62.5% in the iron ore concentrate；
Grade mass content in the iron ore concentrate granularity less than 0.074mm is greater than 40%.
3. preparation method according to claim 1, which is characterized in that the solid fuel includes coke powder or anchracite duff.
4. preparation method according to claim 1, which is characterized in that the basicity of green pellets described in step 1) is 0.8-1.2；
The mass fraction of MgO is 1.2-1.8% in the green pellets.
5. preparation method according to claim 1, which is characterized in that the diameter of green pellets described in step 1) is 8-20mm.
6. a kind of sinter for COREX ironmaking technique of fusion and reduction, which is characterized in that the sinter is by claim 1-
5 any one the methods are prepared.
7. sinter according to claim 6, which is characterized in that the granularity of the sinter is 5-40mm；The sinter
Basicity be 1.6-2.0；The content of MgO is 1.6-2.1% in the sinter.
8. sinter described according to claim 6 or 7, which is characterized in that energy when the sinter charge quality ratio is higher than 50%
Meet requirement of the COREX shaft furnace to sinter low-temperature reduction disintegration energy.
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| CN113943858A (en) * | 2021-09-13 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | Method for improving low-temperature reduction degradation index of sinter |
| CN114540615A (en) * | 2022-01-19 | 2022-05-27 | 中南大学 | Sintering process of iron ore powder pellets |
| CN114763583A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Preparation method of iron ore powder cold briquetting and application of iron ore powder cold briquetting |
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