CN109097561A - A kind of method that large belt burning machine produces low silicon fluxed pellets - Google Patents
A kind of method that large belt burning machine produces low silicon fluxed pellets Download PDFInfo
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- CN109097561A CN109097561A CN201810711987.6A CN201810711987A CN109097561A CN 109097561 A CN109097561 A CN 109097561A CN 201810711987 A CN201810711987 A CN 201810711987A CN 109097561 A CN109097561 A CN 109097561A
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- low silicon
- fluxed pellets
- large belt
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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
- C22B1/02—Roasting processes
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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
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
The invention discloses a kind of method that large belt burning machine produces low silicon fluxed pellets, realizes and produces low silicon fluxed pellets mine using large belt burning machine technique comprising: raw material mixture, wetting, pelletizing, roasting, cooling and finished product classification.Specifically, by fine iron breeze, binder and containing calcium flux, successively after raw material compounding, wetting, pelletizing, roasting and finished product classification processing, low silicon fluxed pellets are obtained.Implement present invention pelletizing SiO produced2Content 2.0-2.5%, CaO/SiO2: 1.0-1.2, compression strength >=2500N/.The low silicon fluxed pellets resistance to compression produced using the method is higher, metallurgical performance is excellent, can be used as blast furnace quality raw materials, improves pelletizing for blast furnace and provides basis with addition of ratio, raising feed grade, reduction slag ratio.
Description
Technical field
The present invention relates to a kind of methods that large belt burning machine produces low silicon fluxed pellets, belong to iron and steel smelting technology
Field, especially pellet production technical field.
Background technique
Europe, North America and Japan and other countries begin to production fluxed pellets mine since the 1970s, and in height
Furnace promotes and applies in smelting, and part blast furnace has been carried out full fluxed pellets and smelts.
In recent years, China with blast furnace process fine fodder demand be continuously increased and steel production energy-saving and emission-reduction requirement increasingly mention
It rises, pellet yield is advanced by leaps and bounds, but is substantially based on acid pellet.Blast furnace raw material is entered furnace structure and is burnt substantially with high alkalinity
Knot mine is taken based on acid pellet, and in order to balance blast furnace burden acid-base balance, it is substantially not high to enter furnace ratio for pellet at present, is limited
Effective performance of pellet excellent benefit energy.
The advantages that pellet has grade height, slag iron than low, and formation fuel ratio is low, is conducive to the energy-saving and emission-reduction of blast furnace, especially
Its low silicon fluxed pellets mine can significantly improve the mechanical strength and reduction degree of pellet, hence it is evident that improve the metallurgical of pellet
Energy.However, the current country of industrial research about large belt burning machine production fluxed pellets still belongs to blank.
Summary of the invention
The present invention is intended to provide a kind of method that large belt burning machine produces low silicon fluxed pellets, this method are produced
Low silicon fluxed pellets SiO2Content is 2.0-2.5%, dual alkalinity R, that is, CaO/SiO2=1.0-1.2, TFe content 64-
65%, resistance to compression >=2500N/, excellent combination property.The method of the invention, which realizes, utilizes large belt burning machine Process Planning
Modelling produces low silicon fluxed pellets mine, starts the beginning that domestic large belt burning machine produces low silicon fluxed pellets, for height
Furnace improves pellet use ratio and provides necessary basis.
The present invention relates to a kind of methods that large belt burning machine produces low silicon fluxed pellets comprising:
(1) it is compounded: by mass percentage, by fine iron breeze 95-97%, 3-5% containing calcium flux, binder 0.2-
0.5% is uniformly mixed；
(2) it soaks: suitable water being added into the mixture, mixed raw material moisture is made to be maintained at 8.0%-
8.3%；
(3) pelletizing: being continuously added to disc balling machine for the raw material mixed, and the pelletizer rotates in the direction of the clock,
The moisturizing into ball disk in rotary course, completes balling process, and the green-ball made continuously is discharged out of described pelletizer；
(4) sieve takes: screening the green-ball of 8-16mm and is transported to belt type roasting machine and is roasted；
(5) roast: the green-ball passes through forced air drying on belt type roasting machine, exhausting drying, preheating, roasts, is primary cold
But roasting process is completed with secondary cooling, is discharged by pellet after cooling by belt type roasting machine tail；
(6) finished product is classified: will be sieved by the pellet after cooling, sieve takes the part of partial size 8-16mm to be
Low silicon fluxed pellets mine.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (1)
In, the fine iron breeze: full iron TFe 69-70%, SiO21.4-2.0%, granularity (- 200 mesh) > 80%；It is described to contain calcium flux
For hydrated lime in powder: CaO 63-68%, granularity (- 200 mesh) > 90%；The binder is bentonite: SO245-53% inhales blue
Amount > 30%, expansion multiple > 18, water absorption rate > 450.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (3)
Described in disc balling machine diameter Ф 7500mm, the high 650mm in side, 45-55 ° of inclination angle, rotation speed 6.8-7.2r/min.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein in step
(3) using atomizer with 0.1-0.8m in rotary course3The moisturizing into the ball disk of the flow of/h.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (4)
Described in forced air drying medium be thermal cycle exhaust gas, temperature be 260-320 DEG C, pressure 2.6-4.0kp, air-flow is worn from bottom to top
Cross the bed of material, drying time 3-4min.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (4)
Described in exhausting dried medium be thermal cycle exhaust gas, temperature be 300-320 DEG C, air-flow passes through the bed of material, drying time from top to bottom
5-6min。
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (4)
Described in preheating temperature be 850-900 DEG C, preheating time 5-6min.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (4)
Described in 1220-1230 DEG C of maturing temperature, calcining time 11-13min.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (4)
Described in once cooling cooling medium be natural air, pressure 1.8-2.0kp, airflow direction passes through the bed of material from bottom to top,
Cooling time is 11-13min.
In the method for the present invention for producing low silicon fluxed pellets using large belt burning machine, wherein step (4)
Described in the cooling medium of secondary cooling be natural air, pressure 1.8-2.0kp, airflow direction passes through the bed of material from bottom to top,
Cooling time is 4-5min.
The low silicon fluxed pellets SiO produced by the method for the invention2Content is 2.0-2.5%, and dual alkalinity R is
CaO/SiO2=1.0-1.2, TFe content 64-65%, resistance to compression >=2500N/, every excellent combination property.It can be seen that this
The method for producing low silicon fluxed pellets using large belt burning machine that invention provides has started domestic large belt burning machine
The beginning of fluxed pellets is produced, the low silicon fluxed pellets resistance to compression of the method production is higher, metallurgical performance is excellent, can be used as height
Furnace quality raw materials improve pelletizing for blast furnace and provide basis with addition of ratio, raising feed grade, reduction slag ratio.
Detailed description of the invention
Fig. 1 produces low silicon high alkalinity fluxed pellets technical process using large belt burning machine to be of the present invention.
Specific embodiment
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
By ready raw material (including fine iron breeze, contain calcium flux, binder), by compounding, wetting, pelletizing, roasting,
Finished product classification, obtains the low silicon fluxed pellets mine of finished product.Specific step is as follows:
A, raw material preparation: fine iron breeze (TFe 69.65%, SiO21.76%, granularity (- 200 mesh) 83.30%), ripe stone
Ashes (CaO 64.73%, granularity (- 200 mesh) 91.26%), bentonite (SO251.23%, Absorbance ratio-derivative method 31.27%, expansion times
Number 19.61, water absorption rate 467.85)；
B, it is compounded: fine iron breeze 96.4%, hydrated lime in powder 3.5%, bentonite 0.4% being prepared in proportion, and mixed
It is mixed in the intensive mixer of efficiency > 98%；
C, soak: in mixed process plus water makes mixed raw material moisture 8.2%；
D, pelletizing: the raw material mixed is continuously added to diameter Ф 7500mm using belt conveyer, the high 650mm in side, is inclined
The disc balling machine that 51 ° of angle, pelletizer are rotated in the direction of the clock with the speed of 7.2r/min, and atomization is utilized in rotary course
Spray head is with 0.5m3The moisturizing into ball disk of the flow of/h, completes balling process, and the green-ball made continuously is discharged out of pelletizer.Benefit
The green-ball of 8-16mm is taken with roller type sieving machine sieve, then is delivered to belt type roasting machine with belt feeder and is roasted.
E, roast: green-ball completes roasting process on belt type roasting machine, and roasting process is specifically divided into forced air drying, exhausting is done
Dry, preheating, roasting, primary cooling and secondary cooling；Wherein, forced air drying medium is thermal cycle exhaust gas, and temperature is 300 DEG C, pressure
Power is 3.5kp, and air-flow passes through the bed of material, drying time 3min from bottom to top；Exhausting dried medium is thermal cycle exhaust gas, and temperature is
320 DEG C, air-flow passes through the bed of material, drying time 5min from top to bottom；Preheating temperature is 880 DEG C, preheating time 5min；Maturing temperature
1230 DEG C, calcining time 11min；Primary cooling cooling medium is natural air, and pressure 1.85kp, airflow direction is from bottom to top
Across the bed of material, cooling time 11min；Secondary cooling cooling medium is natural air, and pressure 1.85kp, airflow direction is under
Be upward through the bed of material, cooling time 4min；It is discharged by pellet after cooling by belt type roasting machine tail；
F, finished product is classified: will be sieved by roasting and cooling pellet, sieve takes the part of partial size 8-16mm to be
Low silicon fluxed pellets.
The TFe content 64.5% of the low silicon high alkalinity fluxed pellets obtained, SiO2Content 2.35%, CaO/SiO2=
1.02。
The finished ball that embodiment obtains is carried out according to " iron ore pellets mine compressive strength determination method GB/T 14201-93 "
Intensity test.
Finished ball nodulizing compression strength index is key index, and according to needs of production, compression strength is greater than 2500N/
A is qualified.Finished ball 60 that above-described embodiment obtains are randomly selected, resistance to compression is carried out in full-automatic compressive strength tester
Intensity detection, mean compressive strength >=2500N/.
Pass through the test present invention low silicon fluxed pellets discovery produced: such pelletizing compression strength is higher, metallurgical
Can be good, it can be used as blast furnace quality raw materials.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these modification and variations and exists
It is interior.
Claims (10)
1. a kind of method that large belt burning machine produces low silicon fluxed pellets, which is characterized in that the described method includes:
(1) it is compounded: by mass percentage, fine iron breeze 95-97%, 3-5% containing calcium flux, binder 0.2-0.5% being mixed
It closes uniform；
(2) it soaks: suitable water being added into the mixture, mixed raw material moisture is made to be maintained at 8.0%-8.3%；
(3) pelletizing: being continuously added to disc balling machine for the raw material mixed, and the pelletizer rotates in the direction of the clock, is revolving
The moisturizing into ball disk during turning, completes balling process, and the green-ball made continuously is discharged out of described pelletizer；
(4) sieve takes: screening the green-ball of 8-16mm and is transported to belt type roasting machine and is roasted；
(5) roast: the green-ball on belt type roasting machine by forced air drying, exhausting is dry, preheating, roasting, it is primary cooling and
Secondary cooling completes roasting process, is discharged by pellet after cooling by belt type roasting machine tail；
(6) finished product is classified: will be sieved by the pellet after cooling, it is low silicon that sieve, which takes the part of partial size 8-16mm,
Fluxed pellets mine.
2. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
The fine iron breeze: full iron TFe 69-70%, SiO21.4-2.0%, granularity (- 200 mesh) > 80%；It is described to be containing calcium flux
Hydrated lime in powder: CaO 63-68%, granularity (- 200 mesh) > 90%；The binder is bentonite: SO245-53%, Absorbance ratio-derivative method >
30%, expansion multiple > 18, water absorption rate > 450.
3. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein diameter Ф 7500mm of disc balling machine described in step (3), the high 650mm in side, 45-55 ° of inclination angle, rotation speed are
6.8-7.2r/min。
4. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein utilize atomizer with 0.1-0.8m in the rotary course of step (3)3The moisturizing into the ball disk of the flow of/h.
5. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein forced air drying medium described in step (4) is thermal cycle exhaust gas, and temperature is 260-320 DEG C, pressure 2.6-4.0kp, gas
Stream passes through the bed of material, drying time 3-4min from bottom to top.
6. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein exhausting dried medium described in step (4) is thermal cycle exhaust gas, and temperature is 300-320 DEG C, and air-flow passes through material from top to bottom
Layer, drying time 5-6min.
7. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein preheating temperature described in step (4) is 850-900 DEG C, preheating time 5-6min.
8. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein 1220-1230 DEG C of maturing temperature described in step (4), calcining time 11-13min.
9. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, which is characterized in that
Wherein cooling medium once cooling described in step (4) is natural air, pressure 1.8-2.0kp, airflow direction from it is lower to
On across the bed of material, cooling time 11-13min.
10. the method for producing low silicon fluxed pellets using large belt burning machine as described in claim 1, feature exist
In wherein the cooling medium of secondary cooling described in step (4) is natural air, and pressure 1.8-2.0kp, airflow direction is under
Be upward through the bed of material, cooling time 4-5min.
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| CN201810711987.6A CN109097561B (en) | 2018-06-29 | 2018-06-29 | Method for producing low-silicon-melting-agent pellets by large-scale belt type roasting machine |
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| CN201810711987.6A CN109097561B (en) | 2018-06-29 | 2018-06-29 | Method for producing low-silicon-melting-agent pellets by large-scale belt type roasting machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110004289A (en) * | 2019-04-03 | 2019-07-12 | 宝钢湛江钢铁有限公司 | A kind of method that high mixture ratio sintering card powder is used for fluxed pellets production |
| CN110104975A (en) * | 2019-05-15 | 2019-08-09 | 中南大学 | A kind of technique that belt type roasting machine pelletizing method prepares gangue lightweight aggregate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110004289A (en) * | 2019-04-03 | 2019-07-12 | 宝钢湛江钢铁有限公司 | A kind of method that high mixture ratio sintering card powder is used for fluxed pellets production |
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| CN110104975A (en) * | 2019-05-15 | 2019-08-09 | 中南大学 | A kind of technique that belt type roasting machine pelletizing method prepares gangue lightweight aggregate |
| CN110104975B (en) * | 2019-05-15 | 2021-06-08 | 中南大学 | Process for preparing coal gangue lightweight aggregate by belt type roasting machine pelletizing method |
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