CN110283992A - A kind of high mixture ratio limonite sintering method - Google Patents
A kind of high mixture ratio limonite sintering method Download PDFInfo
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- CN110283992A CN110283992A CN201910658015.XA CN201910658015A CN110283992A CN 110283992 A CN110283992 A CN 110283992A CN 201910658015 A CN201910658015 A CN 201910658015A CN 110283992 A CN110283992 A CN 110283992A
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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
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Abstract
The invention discloses a kind of high mixture ratio limonite sintering methods, the high mixture ratio limonite sintering method includes pre-treatment and sintering step, specifically include: by 60 ~ 70 parts of mass parts of highly crystalline water limonite, 25 ~ 30 parts contain iron ore concentrate, 5 ~ 10 parts to be uniformly mixed so as to obtain material a containing fine iron ore spare；15 ~ 25 parts of flux is sequentially added in material a and 5 ~ 10 parts of fuel is uniformly mixed so as to obtain material b, and material b pelletizing is obtained into material c；Material c is sintered to obtain finished product sinter d.The present invention effectively overcomes thin-walled gross blow hole caused by highly crystalline water is overflowed because of the crystallization water during the sintering process, it improves solvent burden ratio acceleration of sintering process liquid phase and generates and improve binder strength, pass through the strict control of technological parameter, effectively improve permeability of sintering material bed, be conducive to the generation of calcium ferrite, efficiency of combustion is improved, the crystal phase transition of sinter is inhibited.
Description
Technical field
The invention belongs to steelmaking technical fields, and in particular to a kind of high mixture ratio limonite sintering method.
Background technique
In recent years, as steel excess capacity and market competition are aggravated, iron and steel enterprise is based on Resources Strategy and production cost
Consider, starts largely to be sintered production using low-cost highly crystalline water limonite.But since highly crystalline water limonite has
Have loose porous, bulk density is small, crystal water content is high, granularity is big, Yi Zirong, anabolic strong, special sintering liquid phase and
The features such as phase intensity is low is cohered, during high mixture ratio highly crystalline water limonite sintering, is decomposed after the crystallization water is heated and generates hole,
The degree for generating assimilation between calcium ferrite solution simultaneously is very high, deteriorates the fusion zone gas permeability of sinter bed, local heating is not
Foot.Cause sintering velocity slow, sinter consolidation strength reduces, decrease in yield, and fuel consumption is high, and productivity reduces.How to grind
Study carefully and solve above-mentioned technical problem present in highly crystalline water limonite sintering production, produces high quality, high-intensitive sinter,
Have become the technological innovation new way of each iron and steel enterprise's key breakthrough.
Summary of the invention
The purpose of the present invention is to provide a kind of high mixture ratio limonite sintering methods.
The object of the present invention is achieved like this, and the high mixture ratio limonite sintering method includes pre-treatment and sintering step
Suddenly, it specifically includes:
A, pre-treatment:
1) 60 ~ 70 parts of mass parts of highly crystalline water limonite is pressed, 25 ~ 30 parts contain iron ore concentrate, and 5 ~ 10 parts mix containing fine iron ore
It is spare to obtain material a；
2) 15 ~ 25 parts of flux is sequentially added in material a and 5 ~ 10 parts of fuel is uniformly mixed so as to obtain material b, and material b pelletizing is obtained
To material c；
B, it is sintered: material c being sintered to obtain finished product sinter d.
Since highly crystalline water limonite has, crystal water content is high, loose porous, Yi Zirong, anabolic strong, special burning
It ties liquid phase and coheres the low particularity of phase intensity, there is points of the crystallization water during the highly crystalline water limonite sintering of high mixture ratio
Heat of desorption and excessive water translocation consumption of calorie, sinter is also easy to produce thin-walled gross blow hole, between intensity decline and calcium ferrite solution
It is high to generate assimilation degree, deteriorates the fusion zone gas permeability of sinter bed, causes sintering velocity slow, productivity reduces, is special
It is sintered liquid phase and coheres the technical problem that phase intensity is low, in terms of sinter strength reduction by three." a kind of high mixture ratio is brown by the present invention
Iron ore sintering method " improves mixture moisture, batch layer thickness of sintering machine, machine speed, vertical sintering speed by increasing flux proportion
It spends, the technical measures such as negative pressure before reduction firing temperature, deduster, efficiently solves in above-mentioned highly crystalline water limonite sintering production
The technical issues of, while realizing the production of 65% or more highly crystalline water high mixture ratio limonite sintering, sintering process production efficiency, matter
Amount increases.
The present invention effectively overcomes thin-walled gross blow hole caused by highly crystalline water is overflowed because of the crystallization water during the sintering process, improves
Solvent burden ratio acceleration of sintering process liquid phase generates and improves binder strength and effectively changed by the strict control of technological parameter
Permeability of sintering material bed has been apt to it, has been conducive to the generation of calcium ferrite, improved efficiency of combustion, inhibit the crystal phase transition of sinter, has solved
The technical problem that sinter quality is poor, production efficiency is low present in highly crystalline water limonite high mixture ratio sintering production process,
Promote the use that provide can experience for reference for realize 65% or more the brown mine sintering technology of the highly crystalline water of high mixture ratio.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but the present invention is limited in any way,
Based on present invention teach that it is made it is any transform or replace, all belong to the scope of protection of the present invention.
High mixture ratio limonite sintering method of the present invention includes pre-treatment and sintering step, is specifically included:
A, pre-treatment:
1) 60 ~ 70 parts of mass parts of highly crystalline water limonite is pressed, 25 ~ 30 parts contain iron ore concentrate, and 5 ~ 10 parts mix containing fine iron ore
It is spare to obtain material a；
2) 15 ~ 25 parts of flux is sequentially added in material a and 5 ~ 10 parts of fuel is uniformly mixed so as to obtain material b, and material b pelletizing is obtained
To material c；
B, it is sintered: material c being sintered to obtain finished product sinter d.
The highly crystalline water limonite be iron-content be 55.00% ~ 56.00%, physics water content be 12.00% ~
14.00%, the limonite that crystal water content is 11.00% ~ 13.00%.
Described is iron-content 57.00% ~ 63.00% containing iron ore concentrate containing iron ore concentrate.
The iron content divides mine to be iron-content 58.00% ~ 65.00% containing fine iron ore.
The flux is lime stone, dolomite and/or quick lime.
The flux is 3 ~ 5 parts of lime stone of mass parts, 8 ~ 10 parts of dolomite and 5 ~ 7 parts of quick lime.
The fuel is coking coal and/or anthracite.
The fuel is 4 ~ 6 parts of coking coal of mass parts and 1 ~ 2 part of anthracite.
The pelletizing is mixture b to be placed in cylinder machine is mixed, and adds water and stirs, mixes pelletizing, control mixes
Balling time is 5 ~ 7min, and mixture moisture is 9.00% ~ 10.00%, and the content less than 3mm grade obtains material c less than 35%.
The sintering is that material c is carried out binder by the drafts of 30~50mm, saturating to control bed of material density and the bed of material
Gas 1050~1100 DEG C of firing temperature, machine 1.20~1.25m/min of speed, hangs down in mixture bed depth 730mm~760mm
Straight 13.50~14.00mm/min of speed is sintered before deduster under the conditions of the sintering parameter of 14.50~15.00KPa of negative pressure,
Sinter is obtained, obtains finished product sinter d after broken, cooling, screening.
High mixture ratio limonite sintering method of the present invention, specific steps are as follows:
A, in blending-field by the highly crystalline water limonite of quality proportioning 60.00%~70.00%, 25.00%~30.00% iron content
Concentrate, 5.00%~10.00% ingredient containing fine iron ore, be mixed into new iron charge heap.
B, on the basis of step A by quality proportioning supplying 3.00%~5.00% lime stone, 8.00%~10.00% it is white
Marble, 5.00%~7.00% quick lime, 4.00%~6.00% breeze, 1.00%~2.00% anthracite, with the new iron of step A
Material mixes, and obtains mixture.
C, it by mixture obtained by step B, through belt-conveying into cylinder mixing and blending machine, adds water and stirs and mixes pelletizing,
Control mix pelletizing 5~7 minutes, mixture moisture 9.00%~10.00%, less than 3mm grade content below 35%.
D, by the mixture after step C pelletizing through on belt-conveying to sintering pallet, by 30~50mm drafts into
Row binder, to control bed of material density and bed permeability, in mixture bed depth 730mm~760mm, firing temperature 1050~
1100 DEG C, machine 1.20~1.25m/min of speed, 13.50~14.00mm/min of vertical speed, negative pressure 14.50 before deduster~
It is sintered under the conditions of the sintering parameter of 15.00KPa, obtains sinter.
E, the sinter for obtaining D step is crushed, is cooling, after screening, finished product sinter is obtained, through belt-conveying to finished product
Ore storage bin is sintered to use for blast furnace.
Limonite iron content 55.00%~56.00%, mechanical water 12.00%~14.00% in the step A, crystal water content
12.00%~15.00%.It is iron content 57.00%~63.00% containing iron ore concentrate, is the general of iron content 58.00%~65.00% containing fine iron ore
Logical essence, fine ore.
Solvent lime stone, dolomite, quick lime in the step B, fuel are the common product of market purchase.
Cylinder mixing and blending machine in the step C is the conventional equipment in sintering production.
Parameter is very important technological parameter index in sintering process in the D step, and the selection of state modulator is advantageous
In improving permeability of sintering material bed, production efficiency is improved, improves sinter quality.
The finished product sinter iron content 52.00%~53.00% that the E step obtains, R22.30%~2.50 times, tumbler index
≥80%。
Case is embodied, the invention will be further described below:
Embodiment 1
With certain 260m2For the highly crystalline water limonite industrialness production of sintering machine high mixture ratio, specific embodiment is illustrated:
A, in blending-field by the highly crystalline water limonite of quality proportioning 64.67%, 28.58% iron content containing iron ore concentrate, 6.75%
Fine ore ingredient, to be mixed into new iron charge heap spare.
B, on the basis of step A by quality proportioning be incorporated 5.00% lime stone, 9.00% dolomite, 5.50% life
Lime, 5.00% breeze, 1.30% anthracite mix with the new iron charge of A, obtain mixture.
C, it by mixture obtained by step B, through belt-conveying into cylinder mixing and blending machine, adds water and stirs and mixes pelletizing,
Control mixes Balling time 5.50 minutes, mixture moisture 9.70%, and the content less than 3mm grade is 32.50%.
D, the mixture after step C being pelletized by the drafts of 38mm through being pressed on belt-conveying to sintering pallet
Material, in mixture bed depth 750mm, 1065 DEG C of firing temperature, machine speed 1.23m/min, vertical speed 13.70mm/min are removed
Ignition sintering under the conditions of the sintering parameter of negative pressure 14.80KPa, obtains sinter before dirt device.
E, the sinter for obtaining D step is crushed, is cooling, after screening, finished product sinter is obtained, through belt-conveying to finished product
Ore storage bin is sintered to use for blast furnace.
Embodiment 2
For the ease of comparative descriptions problem, by same sintering machine with addition of highly crystalline water limonite sintering and not with addition of highly crystalline water
Limonite sintering creation data compares.Materials structure proportion is shown in Table 1, and sintering machine process state modulator is shown in Table 2, sintering production
Efficiency, sinter quality are shown in Table 3.
The highly crystalline water of table 1, high manganese limonite sintering proportion
2 sintering process control parameter of table
3 sintering process yield and quality situation of table
Claims (10)
1. a kind of high mixture ratio limonite sintering method, it is characterised in that the high mixture ratio limonite sintering method includes pre-treatment
And sintering step, it specifically includes:
A, pre-treatment:
1) 60 ~ 70 parts of mass parts of highly crystalline water limonite is pressed, 25 ~ 30 parts contain iron ore concentrate, and 5 ~ 10 parts mix containing fine iron ore
It is spare to obtain material a；
2) 15 ~ 25 parts of flux is sequentially added in material a and 5 ~ 10 parts of fuel is uniformly mixed so as to obtain material b, and material b pelletizing is obtained
To material c；
B, it is sintered: material c being sintered to obtain finished product sinter d.
2. high mixture ratio limonite sintering method according to claim 1, it is characterised in that the highly crystalline water limonite
It is 55.00% ~ 56.00% for iron-content, physics water content is that 12.00% ~ 14.00%, crystal water content is 11.00% ~ 13.00%
Limonite.
3. high mixture ratio limonite sintering method according to claim 1, it is characterised in that described is iron content containing iron ore concentrate
Amount 57.00% ~ 63.00% contains iron ore concentrate.
4. high mixture ratio limonite sintering method according to claim 1, it is characterised in that the iron content divides mine to be iron content
Amount 58.00% ~ 65.00% contains fine iron ore.
5. high mixture ratio limonite sintering method according to claim 1, it is characterised in that the flux is lime stone, white
Marble and/or quick lime.
6. high mixture ratio limonite sintering method according to claim 1 or 5, it is characterised in that the flux is mass parts
3 ~ 5 parts of lime stone, 8 ~ 10 parts of dolomite and 5 ~ 7 parts of quick lime.
7. high mixture ratio limonite sintering method according to claim 1, it is characterised in that the fuel be coking coal and/or
Anthracite.
8. high mixture ratio limonite sintering method according to claim 1 or claim 7, it is characterised in that the fuel is mass parts
4 ~ 6 parts of coking coal and 1 ~ 2 part of anthracite.
9. high mixture ratio limonite sintering method according to claim 1, it is characterised in that the pelletizing is by mixture b
It is placed in cylinder and machine is mixed, add water and stir, mix pelletizing, it is 5 ~ 7min that control, which mixes Balling time, and mixture moisture is
9.00% ~ 10.00%, the content less than 3mm grade obtains material c less than 35%.
10. high mixture ratio limonite sintering method according to claim 1, it is characterised in that the sintering is by material c
By 30~50mm drafts carry out binder, to control bed of material density and bed permeability, mixture bed depth 730mm~
760mm, 1050~1100 DEG C of firing temperature, machine 1.20~1.25m/min of speed, 13.50~14.00mm/min of vertical speed are removed
It is sintered under the conditions of the sintering parameter of 14.50~15.00KPa of negative pressure before dirt device, obtains sinter, be crushed, is cooling, after screening
Obtain finished product sinter d.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111154970A (en) * | 2020-01-07 | 2020-05-15 | 武钢集团昆明钢铁股份有限公司 | Method for improving quality of sinter in sintering production of large-proportion limonite |
| CN111172385A (en) * | 2020-01-20 | 2020-05-19 | 包头钢铁（集团）有限责任公司 | Method for preparing sintered ore by using high-crystallization-water iron ore powder |
| CN113528808A (en) * | 2021-05-24 | 2021-10-22 | 红河钢铁有限公司 | Sintered ore based on high-crystal-water limonite and magnetic separation tailings and production method thereof |
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| CN113528808A (en) * | 2021-05-24 | 2021-10-22 | 红河钢铁有限公司 | Sintered ore based on high-crystal-water limonite and magnetic separation tailings and production method thereof |
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