CN103834801B - A kind of method improving magnetite powder pellet quality - Google Patents
A kind of method improving magnetite powder pellet quality Download PDFInfo
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- CN103834801B CN103834801B CN201410106104.0A CN201410106104A CN103834801B CN 103834801 B CN103834801 B CN 103834801B CN 201410106104 A CN201410106104 A CN 201410106104A CN 103834801 B CN103834801 B CN 103834801B
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Abstract
The present invention relates to a kind of method improving magnetite powder pellet quality, comprise and the length of drying grate roasting one section and two sections is transformed, by original roasting one elongated segment by the preheating and baking technique that roasting two sections is shortened; And maturing temperature parameter is adjusted, emphasis improves roasting one section of temperature, and reduce roasting two sections of temperature; Corresponding adjustment is carried out to the granularity of pellet simultaneously, be adjusted to 7-14mm by the 9-16mm of routine.The enforcement of the method, had both reduced the temperature of roasting two sections, had also improved the intensity of finished ball nodulizing, also improved the metallurgical performance of finished ball nodulizing simultaneously; By adjusting the particle diameter of pellet, solve the outer easily consolidation rapidly of magnetite powder pelletizing, and affect the problem of pellet successively uniform alumina.
Description
Technical field
The present invention relates to a kind of method improving magnetite powder pellet quality.
Background technology
Magnet fine mineral powder is the desirable feedstock of producing pellet, in the past because magnetite concentrate Powder Particle Size is thicker, granularity is less than 0.074mm(granularity and is less than 200 orders) ratio below 60%, on the one hand, be difficult to during pelletizing make the qualified green-ball of intensity, meanwhile, because of coarse size, during roasting, also need higher maturing temperature and longer roasting time.For this reason, to the further fine grinding of iron ore, the granularity of powdered iron ore is attenuated further, granularity be less than 0.074mm ratio major part below 100%, granularity is less than 0.044mm(granularity and is less than 325 orders) ratio also can reach more than 80%.But find in production process, powdered iron ore granularity becomes too carefully, and ballability improves, and green pellets quality is improved, but during roasting, its thermal parameter is bad control on the contrary, and main manifestations is that the bad control of roasting two sections of temperature controls, if roasting two sections of temperature are too low, the pellet strength entering rotary kiln is low, can not production requirement be met, and after improving roasting two sections of temperature further, enter rotary kiln pellet strength and can decline on the contrary.After through research find, the roasting induration property of fine granularity magnetite powder pelletizing is different from coarsness magnetite powder, for fine granularity magnetite powder pelletizing, if when the temperature of roasting one section and two sections controls to be not suitable for, particularly in order to improve preheated pellets ore deposit intensity improve roasting two sections of temperature time, the skin easily rapid consolidation of pellet, hinder the successively oxidation of pellet in subsequent process, the intensity entering rotary kiln pellet is caused to reduce on the contrary, simultaneously owing to forming the different layering oxidative phenomena of degree, by the metallurgical performance of the intensity and finished ball nodulizing that have a strong impact on finished ball nodulizing.
Domestic employing drying grate--rotary kiln technology produce pellet actual from 2000 later on a large scale, as the key equipment of pellet preheating and baking--drying grate, generally be divided into four sections, be respectively air blast section, exhausting section, roasting one section, roasting two sections, wherein roasting one section, the design length that roasting is two sections is shorter with reference to external roasting one section substantially, the mentality of designing that roasting two sections is longer, this design is suitable for roasting ground hematite pelletizing and coarsness magnetite powder pelletizing, but during for roasting fine grade magnetite powder pellet, because roasting one section is shorter, the preheating and baking time is also short, after such pellet enters roasting two sections, for improving the intensity in preheated pellets ore deposit, must under the high temperature of 900-1100 DEG C rapidly pre-warming roasting to improve the intensity in preheated pellets ore deposit, the skin easily rapid consolidation of such pellet, the intensity of pellet and metallurgical performance is caused to worsen on the contrary.
Summary of the invention
Drying grate is adopted in order to overcome existing fine fraction magnetite powder--rotary kiln technology produces the deficiency of pellet, the invention provides a kind of method improving magnetite powder pellet quality, manufactures pelletizing can improve pellet strength and metallurgical performance by present method.
A kind of method improving magnetite powder pellet quality provided by the invention, comprising:
(1), in magnetite powder pelletizing preheating and baking process, the roasting one section of drying grate and the length of roasting two sections is improved:
Original roasting one segment length is extended, roasting two segment length is shortened;
Be 11m for original drying grate roasting one segment length, be adjusted to 15 ~ 17m, and the length of original roasting two sections be 19m, be adjusted to 13 ~ 15m.
(2), in magnetite powder pelletizing preheating and baking process, the roasting one section of drying grate and the temperature of roasting two sections is improved:
Improve the temperature of roasting one section, reduce the temperature of roasting two sections;
Maturing temperature parameter is adjusted, roasting one section of temperature is brought up to 600 ~ 700 DEG C by 600 DEG C, and roasting two sections of temperature is reduced to 850 ~ 980 DEG C by 1050 DEG C.
(3) granularity of raw pellet ore is adjusted:
The granularity entering the raw pellet ore of drying grate is adjusted to 7 ~ 14mm by the 9-16mm of routine.
The present invention improves in the method for magnetite powder pellet quality, and the ratio that in described fine fraction magnetite powder, granularity is less than 0.044mm accounts for more than 90%, and granularity is very thin; FeO content, more than 25%, is typical magnetite powder.
The length adjustment transformation of the present invention to the roasting one section of drying grate and roasting two sections is not limited to the drying grate that roasting one segment length is 11m, roasting two segment length is 19m, for other roasting one section, shorter and roasting two sections of drying grates compared with long type also can Adjustment and reform, and can play the corresponding effect improving Ultra-fine magnetite powder pellet quality.
In such scheme, the length of described drying grate roasting one section and roasting two sections is achieved in the following ways: the partition wall in transformation drying grate petticoat pipe, is moved by the partition wall between roasting one section and roasting two sections to roasting two sections of directions.
The present invention is also adapted to the technological design of newly-built grate-kiln pelletizing ore deposit production line, and its main iron charge is fine fraction magnetite powder.The granularity of the present invention to fine fraction magnetite powder has done restriction.
The present invention improves the method for fine fraction magnetite powder pellet quality, and concrete steps are:
(1) length of transformation adjustment drying grate roasting one section and roasting two sections
By the partition wall in transformation drying grate petticoat pipe, moved to roasting two sections of directions by partition wall between roasting one section and roasting two sections, to be roasting one section by shorter for original roasting one section and roasting two sections is longer preheating and baking technological transformation longer and the preheating and baking technique that roasting two sections is shorter; Extend to 15-17m by original roasting one section by 11m, and roasting two sections shortens to 13-15m by 19m;
(2) temperature of drying grate roasting one section and two sections is adjusted
Adjust maturing temperature parameter, emphasis improves roasting one section of temperature, and reduce roasting two sections of temperature, bring up to 600-700 DEG C, and roasting two sections of temperature is reduced to 850-980 DEG C by 1050 DEG C by roasting one section of temperature by 600 DEG C.
(3) batching, pelletizing
Pelletizing powdered iron ore, bentonitic kind and by weight percentage batching be:
Fine iron breeze 98%
Wilkinite 2.0%
Wherein, fine iron breeze granularity is less than 0.044mm(325 order) ratio be 96.3%; Produce pelletizing through balling disc, obtain water ratio be 9.0%-9.6%(by weight percentage) green pellets, pelletizing particle diameter is 7mm-14mm;
(4) pellet preheating and roasting
Particle diameter is the green pellets of 7mm-14mm, enters drying grate through preheating, roasting, obtains finished pellet.
Of the present invention
beneficial effect:
(1) the present invention is by carrying out transformation adjustment to the roasting one section of drying grate and the length of two sections, and its maturing temperature is also adjusted accordingly, both reduce the temperature of roasting two sections, also improved the intensity of finished ball nodulizing, also improve the metallurgical performance of finished ball nodulizing simultaneously; (2) have adjusted the particle diameter of pellet, solve the outer easily rapid oxidation consolidation of magnetite powder pelletizing, and affect pellet successively uniform alumina, thus cause the problem that pellet strength and metallurgical performance are deteriorated.
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment
Embodiment 1:
benchmark embodiment (prior art)
This benchmark example is conventional drying grate--rotary kiln production technique, and the roasting one section of its drying grate is longer, and roasting two sections is shorter.
The concrete steps of the pellet prepared by this technique are as follows:
(1) prepare burden:
Batching is by weight percentage:
Fine iron breeze 98%
Wilkinite 2.0%
Wherein, fine iron breeze is Shanxi Dai County magnetite powder, and granularity is less than 0.044mm(325 order) ratio be 96.3%, TFe be 65.3%, FeO be 27.4%.
(2) pelletizing is mixed
Above-mentioned batching mixes through mixer, and then add in balling disc and keep the skin wet, pelletizing produces pelletizing, obtain water ratio be 9.0%-9.6%(by weight percentage) pelletizing, pelletizing particle diameter is 9mm-16mm;
(3) roasting
Above-mentioned green pellets, chain grate-rotary kiln carries out cloth, roasting, obtains finished pellet; Its preheating and baking processing parameter sees the following form 1.Its pellet quality index is in table 2.
Table 1 benchmark embodiment drying grate preheating and baking processing parameter
Table 2 benchmark embodiment pellet quality index
。
embodiment 2
The present embodiment is the example of the produced in lengths pellet of adjustment drying grate roasting one section and roasting two sections, and wherein the particle diameter of pellet also adjusts.
(1) length of transformation adjustment drying grate roasting one section and roasting two sections
By the partition wall in transformation drying grate petticoat pipe, the partition wall between roasting one section and roasting two sections is moved to roasting two sections of directions, original roasting one section is adjusted to 15m by 11 m, and roasting two sections is adjusted to 15m by 19 m;
(2) temperature of roasting one section and two sections is adjusted
Drying grate maturing temperature parameter is adjusted, roasting one section of temperature is brought up to 680 DEG C by 600 DEG C, and roasting two sections of temperature is reduced to 960 DEG C by 1050 DEG C.
(3) pelletizing
Pelletizing powdered iron ore, bentonitic kind and proportioning with benchmark example, produce pelletizing through balling disc, obtain water ratio be 9.0%-9.6%(by weight percentage) pelletizing, pelletizing particle diameter is 7mm-14mm;
(4) pellet preheating and roasting
Chain grate-rotary kiln carries out cloth, roasting, obtains finished pellet; Its preheating and baking processing parameter sees the following form 3.Its pellet quality index is in table 4.
Table 3 embodiment 1 drying grate preheating and baking processing parameter
Table 4 embodiment 1 pellet quality index
。
embodiment 2
The present embodiment is on the basis of embodiment 1, the example of the produced in lengths pellet of adjustment drying grate roasting one section and roasting two sections further.
(1) transformation adjusts the length of drying grate roasting one section and two sections
By the partition wall in transformation drying grate petticoat pipe, the partition wall between roasting one section and two sections is moved to roasting two sections of directions, original roasting one section is adjusted to 17m by 11 m, and roasting two sections is adjusted to 13m by 19 m;
(2) temperature of drying grate roasting one section and two sections is adjusted
Maturing temperature parameter is adjusted, roasting one section of temperature is brought up to 680 DEG C by 600 DEG C, and roasting two sections of temperature is reduced to 960 DEG C by 1050 DEG C.
(3) pelletizing
Pelletizing powdered iron ore, bentonitic kind and proportioning with benchmark example, produce pelletizing through balling disc, obtain water ratio be 9.0%-9.6%(by weight percentage) pelletizing, pelletizing particle diameter is 7mm-14mm;
(4) pellet preheating and roasting
Chain grate-rotary kiln carries out cloth, roasting, obtains finished pellet; Its preheating and baking processing parameter sees the following form 5.Its pellet quality index is in table 6.
Table 5 embodiment 2 drying grate preheating and baking processing parameter
Table 6 embodiment 2 pellet quality index
。
embodiment 3
The present embodiment is on the basis of embodiment 2, further increases the temperature of roasting one section and two sections.
(1) transformation adjusts the length of drying grate roasting one section and two sections
By the partition wall in transformation drying grate petticoat pipe, the partition wall between roasting one section and two sections is moved to roasting two sections of directions, original roasting one section is adjusted to 17m by 11 m, and roasting two sections is adjusted to 13m by 19 m;
(2) temperature of drying grate roasting one section and two sections is adjusted
Maturing temperature parameter is adjusted, roasting one section of temperature is brought up to 700 DEG C, and roasting two sections of temperature brings up to 980 DEG C.
(3) pelletizing
Pelletizing powdered iron ore, bentonitic kind and proportioning with benchmark example, produce pelletizing through balling disc, obtain water ratio be 9.0%-9.6%(by weight percentage) pelletizing, pelletizing particle diameter is 7mm-14mm;
(4) pellet preheating and roasting
Chain grate-rotary kiln carries out cloth, roasting, obtains finished pellet; Its preheating and baking processing parameter sees the following form 7.Its pellet quality index is in table 8.
Table 7 embodiment 3 drying grate preheating and baking processing parameter
Table 8 embodiment 3 pellet quality index
。
The various embodiments described above compare with benchmark example: for the embodiment of the present invention 1, by the partition wall in transformation drying grate petticoat pipe, original roasting one section is adjusted to 15m by 11 m, and after roasting two sections is adjusted to 15m by 19 m, and roasting one section of temperature is brought up to 680 DEG C by 600 DEG C, and roasting two sections of temperature are when being reduced to 960 DEG C by 1050 DEG C, after the granularity of pellet being adjusted to 7-14mm by 9-16mm simultaneously, compare with benchmark embodiment, preheated ball has brought up to a 587 newton/ball by a 446 newton/ball, finished ball intensity has brought up to a 2467 newton/ball by a 2231 newton/ball, finished ball 900 DEG C of reduction degrees have brought up to 68.9% by 64.2%, and rate of expansion has been reduced to 16.7% by 21.3%.The intensity of pre-hot-bulb and finished ball nodulizing is improved, and finished ball metallurgical performance index also improves simultaneously.
For the embodiment of the present invention 2, by the partition wall in transformation drying grate petticoat pipe, roasting one section is adjusted to 17m by 15 m, and after roasting two sections is adjusted to 13m by 15 m, keep roasting one section of temperature and two sections temperature-resistant time, after the granularity of pellet being adjusted to 7-14mm by 9-16mm simultaneously, compare with embodiment 1, preheated ball has brought up to a 612 newton/ball by a 587 newton/ball, finished ball intensity has brought up to a 2586 newton/ball by a 2467 newton/ball, finished ball 900 DEG C of reduction degrees have brought up to 72.4% by 68.9%, and rate of expansion has been reduced to 16.1% by 16.7%.The intensity of pre-hot-bulb and finished ball nodulizing is improved, and finished ball metallurgical performance index also improves simultaneously.
For the embodiment of the present invention 3, by the partition wall in transformation drying grate petticoat pipe, and after improving preheated one-section temperature and preheating two sections of temperature further, compare with embodiment 2, preheated ball has brought up to a 752 newton/ball by a 612 newton/ball, finished ball intensity has brought up to a 2613 newton/ball by a 2586 newton/ball, and finished ball 900 DEG C of reduction degrees and rate of expansion change are not quite.The intensity of pre-hot-bulb and finished ball nodulizing is improved.
Therefore, when adopting method provided by the invention to produce fine fraction magnetite powder pelletizing breeze, the intensity of pre-hot-bulb and finished ball nodulizing is improved, and metallurgical performance index also improves simultaneously.
Claims (2)
1. improve a method for magnetite powder pellet quality, magnetite powder is fine fraction magnetite powder, and the ratio that in described fine fraction magnetite powder, granularity is less than 0.044mm accounts for more than 90%; FeO content is more than 25%; It is characterized in that:
(1) in magnetite powder pelletizing preheating and baking process, the adjustment roasting one section of drying grate and the length of roasting two sections:
Original roasting one section is extended to 15-17m by 11m, and roasting two sections shortens to 13-15m by 19m;
(2), in magnetite powder pelletizing preheating and baking process, the roasting one section of drying grate and the temperature of roasting two sections is improved:
Roasting one section of temperature is brought up to 600-700 DEG C by 600 DEG C, and roasting two sections of temperature are reduced to 850-980 DEG C by 1050 DEG C;
(3) granularity of raw pellet ore is adjusted:
The granularity entering the raw pellet ore of drying grate is 7 ~ 14mm.
2. the method improving magnetite powder pellet quality according to claim 1, it is characterized in that: the length of described drying grate roasting one section and roasting two sections is achieved in the following ways: the partition wall in transformation drying grate petticoat pipe, the partition wall between roasting one section and roasting two sections is moved to roasting two sections of directions.
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| CN105525091B (en) * | 2016-01-28 | 2017-12-01 | 太原钢铁(集团)有限公司 | A kind of method of roasting of speculum iron at high proportion |
| CN107739820B (en) * | 2017-10-24 | 2019-03-19 | 山西太钢不锈钢股份有限公司 | Magnetite powder pellet and its production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4261459A (en) * | 1979-09-04 | 1981-04-14 | Koppers Company, Inc. | Continuous grate track length compensator |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN102776356A (en) * | 2012-07-26 | 2012-11-14 | 山西太钢不锈钢股份有限公司 | Method for improving pellet qualities |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4261459A (en) * | 1979-09-04 | 1981-04-14 | Koppers Company, Inc. | Continuous grate track length compensator |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN102776356A (en) * | 2012-07-26 | 2012-11-14 | 山西太钢不锈钢股份有限公司 | Method for improving pellet qualities |
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