CN108866325A - A method of improving magnesian flux bursting temperature of pellet ores - Google Patents
A method of improving magnesian flux bursting temperature of pellet ores Download PDFInfo
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- CN108866325A CN108866325A CN201710572684.6A CN201710572684A CN108866325A CN 108866325 A CN108866325 A CN 108866325A CN 201710572684 A CN201710572684 A CN 201710572684A CN 108866325 A CN108866325 A CN 108866325A
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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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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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
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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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of method for improving magnesian flux bursting temperature of pellet ores, is related to iron-smelting raw material pellet technical field.The method of the present invention is：Weigh iron ore concentrate, Mg-high andesite, high-calcium powder, organic binder, sodium bentonite, vermiculite；Mixture will be mixed to get；It will close and expect to carry out pelletizing molding, green-ball is made；Ball is successively dried, is preheated, is roasted and ring cold treatment.The green ball strength of the method for the present invention, preparation is good, and in 2 meter per second of air velocity, cracking temperature of green pel let is up to 9850 DEG C, and the magnesian flux bursting temperature of pellet ores of preparation is high, and green ball strength is high, and improves productivity, and finished ball pellet quality is uniform, high-quality.
Description
Technical field
The present invention relates to iron-smelting raw material pellet technical fields, and in particular to a kind of raising magnesian flux bursting temperature of pellet ores
Method.
Background technique
As modern blast furnace ironmaking requires more and more tighter and smelting iron and steel short route rise to fine fodder, pellet exists
Effect in steel and iron industry is more and more important.Compared with conventional sintering, pellet have intensity is good, epigranular, regular shape,
The advantages that ferrous grade is high, Well-recovered can play increasing And Coke-saving in blast furnace process, improve ironmaking technology economic indicator, drop
Low pig iron cost and the effect increased economic efficiency.
In the production process of iron ore pellets mine, the reason of green-ball easily bursts, and green-ball bursts is temperature-rise period
The great increase of saturated vapor pressure inside middle pelletizing, when being more than the stress that green-ball itself can bear, produces crackle or explosion,
In production, if drying system is unreasonable, cause cracking temperature of green pel let relatively low, green-ball will burst dusting in the drying process, meeting
It is added to the amount of powder of kiln, so as to cause roasting kiln ring formation and influences the stabilization of thermal regulation.In addition, if the ball to split is more,
The compression strength that finished ball will also be reduced, influences finished ball quality.It prevents pelletizing from bursting, the explosion temperature of pelletizing must be improved
Degree.Related with several factors to temperature, heating rate, the moisture of green-ball, the porosity of green-ball etc. of bursting have relationship.
In addition, the burst temperature of pellet and material performance, Binder Properties, pellet forming process and drying system etc. also have
It closes, in the production process of iron ore pellets mine, part pelletizing bursts, and the gas permeability of the bed of material will be deteriorated, to preheating, roasting
Difficulty is brought, productivity decline is eventually led to, finished ball pellet quality is uneven, increases rejection rate, also results in finished ball nodulizing
Mechanical performance decline, such as strength reduction, therefore, to obtain quality pellets mine, the burst temperature for improving green-ball is highly desirable.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of method for improving magnesian flux bursting temperature of pellet ores, solution
It has determined in the production process of pellet in the prior art, cracking temperature of green pel let is relatively low, the technical issues of easily explosion.
In order to achieve the above object, technical solution of the present invention is achieved by the following technical programs：
A method of magnesian flux bursting temperature of pellet ores is improved, is included the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 1~2.2%, account for iron ore concentrate
The high-calcium powder of weight 0.8~1.5%, accounts for iron ore concentrate weight 1~1.5% at the organic binder for accounting for iron ore concentrate weight 0.05~0.12%
Sodium bentonite, account for the vermiculite of iron ore concentrate weight 0.01~0.05%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet.
Preferably, the granularity of the iron ore concentrate is -200~-150 mesh.
Preferably, the Mg-high andesite accounts for the 1.5~1.8% of iron ore concentrate weight.
Preferably, the pelletizing molding time described in step S3 is 5~7.5min.
Preferably, the percentage that granularity accounts for the iron ore concentrate total weight for the concentrate of -180 mesh in the iron ore concentrate is at least
93%.
Preferably, maturing temperature described in step S4 is 1200~1300 DEG C, and furnace zone is 18~22 DEG C, calcining time 35
~45min.
Preferably, maturing temperature described in step S4 is 1250 DEG C, and furnace zone is 20 DEG C, and calcining time is 40 min.
Preferably, drying temperature described in step S4 is 180~280 DEG C, and the time is 10~14min.
Preferably, preheating temperature described in step S4 is 700~800 DEG C, and the time is 12~15min.
The present invention provides a kind of method for improving magnesian flux bursting temperature of pellet ores, and advantage exists compared with prior art
In：
The method that the present invention improves magnesian flux bursting temperature of pellet ores, the green ball strength of preparation is good, 2 meters of air velocity/
In second, cracking temperature of green pel let uses iron ore concentrate, cooperation up to 9850 DEG C in the preparation process of magnesian flux pellet of the present invention
Mg-high andesite, high-calcium powder, organic binder, sodium bentonite, vermiculite collective effect, iron ore concentrate degree granularity are -200~-150 mesh,
It is swollen by adjusting magnesian flux pellet production process technology condition and Mg-high andesite, high-calcium powder, organic binder, sodium base
The additive amount of profit soil, vermiculite, the especially method of the additive amount of Mg-high andesite, the magnesian flux bursting temperature of pellet ores of preparation
Height, and green ball strength is high, and improves productivity, finished ball pellet quality is uniform, high-quality；
The method that the present invention improves magnesian flux bursting temperature of pellet ores is suitable for giving birth in raw material using Mg-high andesite, high-calcium powder
Fluxed pellets mine is produced, Mg-high andesite, the mineralization ability of high-calcium powder are strong, improve the diffusion coefficient of solid phase, enhance fluxed ball
The consolidation of group, and then improve the burst temperature of green-ball；Sodium bentonite can reduce the evaporation rate of moisture in green-ball, make
Water slowly releases, to reduce the vapour pressure inside green-ball, sodium bentonite can improve dry bulb intensity, and then improve quick-fried
Temperature is split, green-ball generates gap after sodium bentonite is added, and pelletizing moisture is easily precipitated when dry；Organic binder can be improved dry
The tensile strength of ball, the porosity, and then improve burst temperature.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to the embodiment of the present invention pair
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
Embodiment 1：
The method that the present embodiment improves magnesian flux bursting temperature of pellet ores, includes the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 1%, account for iron ore concentrate weight
0.8% high-calcium powder, the sodium bentonite for accounting for iron ore concentrate weight 1%, accounts for iron essence at the organic binder for accounting for iron ore concentrate weight 0.05%
The vermiculite of mine weight 0.01%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made, wherein pelletizing is molding
Time is 5min；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet,
Wherein maturing temperature is 1200 DEG C, and furnace zone is 18 DEG C, calcining time 35min；Drying temperature is 180 DEG C, and the time is
10min；Preheating temperature is 700 DEG C, time 12min；
Wherein, the granularity of iron ore concentrate is -200 mesh.
Embodiment 2：
The method that the present embodiment improves magnesian flux bursting temperature of pellet ores, includes the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 2.2%, account for iron ore concentrate weight
The high-calcium powder of amount 1.5%, the sodium bentonite for accounting for iron ore concentrate weight 1.5%, accounts for the organic binder for accounting for iron ore concentrate weight 0.12%
The vermiculite of iron ore concentrate weight 0.05%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made, wherein pelletizing is molding
Time is 7.5min；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet,
Wherein maturing temperature is 1300 DEG C, and furnace zone is 22 DEG C, calcining time 45min；Drying temperature is 280 DEG C, and the time is
14min；Preheating temperature is 800 DEG C, time 15min；
Wherein, the granularity of iron ore concentrate is -150 mesh.
Embodiment 3：
The method that the present embodiment improves magnesian flux bursting temperature of pellet ores, includes the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 1.5%, account for iron ore concentrate weight
The high-calcium powder of amount 1.1%, the sodium bentonite for accounting for iron ore concentrate weight 1.3%, accounts for the organic binder for accounting for iron ore concentrate weight 0.08%
The vermiculite of iron ore concentrate weight 0.03%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made, wherein pelletizing is molding
Time is 6min；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet,
Wherein maturing temperature is 1250 DEG C, and furnace zone is 20 DEG C, and calcining time is 40 min；Drying temperature is 230 DEG C, and the time is
12min；Preheating temperature is 750 DEG C, time 13min；
Wherein, granularity is that account for the percentage of the iron ore concentrate total weight be 95 for the concentrate of -180 mesh in iron ore concentrate.
Embodiment 4：
The method that the present embodiment improves magnesian flux bursting temperature of pellet ores, includes the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 1.5%, account for iron ore concentrate weight
The high-calcium powder of amount 0.9%, the sodium bentonite for accounting for iron ore concentrate weight 1.1%, accounts for the organic binder for accounting for iron ore concentrate weight 0.08%
The vermiculite of iron ore concentrate weight 0.02%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made, wherein pelletizing is molding
Time is 5.5min；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet,
Wherein maturing temperature is 1250 DEG C, and furnace zone is 20 DEG C, and calcining time is 40 min；Drying temperature is 200 DEG C, and the time is
11min；Preheating temperature is 720 DEG C, time 13min；
Wherein, granularity is that account for the percentage of the iron ore concentrate total weight be 93 for the concentrate of -180 mesh in iron ore concentrate.
Embodiment 5：
The method that the present embodiment improves magnesian flux bursting temperature of pellet ores, includes the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 1.8%, account for iron ore concentrate weight
The high-calcium powder of amount 1.4%, the sodium bentonite for accounting for iron ore concentrate weight 1.4%, accounts for the organic binder for accounting for iron ore concentrate weight 0.05%
The vermiculite of iron ore concentrate weight 0.04%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made, wherein pelletizing is molding
Time is 7min；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet,
Wherein maturing temperature is 1250 DEG C, and furnace zone is 20 DEG C, and calcining time is 40 min；Drying temperature is 260 DEG C, and the time is
13min；Preheating temperature is 780 DEG C, time 14min；
Wherein, granularity is that account for the percentage of the iron ore concentrate total weight be 98 for the concentrate of -180 mesh in iron ore concentrate.
In conclusion the method that the present invention improves magnesian flux bursting temperature of pellet ores, Mg-high andesite, height are used in raw material
Calcium powder is suitable for producing fluxed pellets mine, and Mg-high andesite, the mineralization ability of high-calcium powder are strong, improve the diffusion coefficient of solid phase, by force
Change the consolidation of fluxed pellets, and then improves the burst temperature of green-ball；Sodium bentonite can reduce moisture in green-ball
Evaporation rate, release water slowly, to reduce the vapour pressure inside green-ball, it is strong that sodium bentonite can improve dry bulb
Degree, and then burst temperature is improved, green-ball generates gap after sodium bentonite is added, and pelletizing moisture is easily precipitated when dry；It is organic viscous
Knot agent can be improved the tensile strength of dry bulb, the porosity, and then improve burst temperature, and the green ball strength of preparation is good, in gas velocity
It spends in 2 meter per seconds, cracking temperature of green pel let is up to 9850 DEG C, using iron essence in the preparation process of magnesian flux pellet of the present invention
Mine, cooperate Mg-high andesite, high-calcium powder, organic binder, sodium bentonite, vermiculite collective effect, iron ore concentrate degree granularity be -200~-
150 mesh, by adjusting magnesian flux pellet production process technology condition and Mg-high andesite, high-calcium powder, organic binder,
The method of the additive amount of the additive amount of sodium bentonite, vermiculite, especially Mg-high andesite, the magnesian flux pellet explosion of preparation
Temperature is high, and green ball strength is high, and improves productivity, and finished ball pellet quality is uniform, high-quality.
It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although ginseng
According to previous embodiment, invention is explained in detail, those skilled in the art should understand that：It still can be with
It modifies the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (9)
1. a kind of method for improving magnesian flux bursting temperature of pellet ores, which is characterized in that include the following steps：
S1, iron ore concentrate is weighed, is subject to the weight of iron ore concentrate, weighed and account for the Mg-high andesite of iron ore concentrate weight 1~2.2%, account for iron ore concentrate
The high-calcium powder of weight 0.8~1.5%, accounts for iron ore concentrate weight 1~1.5% at the organic binder for accounting for iron ore concentrate weight 0.05~0.12%
Sodium bentonite, account for the vermiculite of iron ore concentrate weight 0.01~0.05%；
S2, mixture will be mixed to get in each raw material addition in step S1 by force mixed machine；
S3, the mixture in step S2 is carried out by pelletizing molding using disc balling machine, green-ball is made；
S4, the green-ball in step S3 is successively dried, is preheated, is roasted and ring cold treatment is to get magnesian flux pellet.
2. according to the method described in claim 1, it is characterized in that：The granularity of the iron ore concentrate is -200~-150 mesh.
3. according to the method described in claim 1, it is characterized in that：The Mg-high andesite accounts for the 1.5~1.8% of iron ore concentrate weight.
4. according to the method described in claim 1, it is characterized in that：The molding time of pelletizing described in step S3 is 5~7.5min.
5. according to the method described in claim 2, it is characterized in that：Granularity accounts for described in the iron ore concentrate for the concentrate of -180 mesh
The percentage of iron ore concentrate total weight is at least 93%.
6. according to the method described in claim 1, it is characterized in that：Maturing temperature described in step S4 is 1200~1300 DEG C, roasting
Burning section is 18~22 DEG C, and calcining time is 35~45min.
7. according to the method described in claim 6, it is characterized in that：Maturing temperature described in step S4 is 1250 DEG C, and furnace zone is
20 DEG C, calcining time is 40 min.
8. according to the method described in claim 1, it is characterized in that：Drying temperature described in step S4 is 180~280 DEG C, the time
For 10~14min.
9. according to the method described in claim 1, it is characterized in that：Preheating temperature described in step S4 is 700~800 DEG C, the time
For 12~15min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923443A (en) * | 2019-11-13 | 2020-03-27 | 鞍钢集团矿业有限公司 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
| CN114410960A (en) * | 2021-12-17 | 2022-04-29 | 萍乡市众邦冶金有限公司 | Pelletizing production process for steel smelting |
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| CN110923443A (en) * | 2019-11-13 | 2020-03-27 | 鞍钢集团矿业有限公司 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
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