CN103614551B - Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof - Google Patents

Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof Download PDF

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Publication number
CN103614551B
CN103614551B CN201310669712.8A CN201310669712A CN103614551B CN 103614551 B CN103614551 B CN 103614551B CN 201310669712 A CN201310669712 A CN 201310669712A CN 103614551 B CN103614551 B CN 103614551B
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granularity
pellet
powder
iron concentrate
roasting
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CN103614551A (en
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王福才
杨杰康
刘宁斌
李云峰
王映荣
刘自敏
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Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
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Abstract

The invention discloses pellet ore with good metallurgical property and proper alkalinity and a preparation method thereof, and belongs to the technical field of modification of metallurgical materials. The reduction degree of the pellet ore is 64.00 to 67.00 percent. The pellet ore is prepared by adding limestone powder or dolomite powder with the granularity being less than or equal to 0.074 mm into powdered iron according to the using amount of 2.8 to 5.3 percent. The preparation method comprises the processes of crushing, mixing, pelletizing and roasting, and particularly comprises the following steps: crushing the limestone or the dolomite into powder with the granularity being 10 to 15 mm and then crushing into powder with the granularity being less than or equal to 0.074 mm; adding the limestone powder or the dolomite powder into the powdered iron according to the using amount of 2.8 to 5.3 percent, and mixing uniformly; adjusting the water content of the mixed ore material to be 8 to 9 percent and pelletizing in a disc pelletizing machine; and drying and preheating green balls at the temperature of 200 to 960 DEG C for 12 to 17 minutes, roasting at the temperature of 1,250 to 1,280 DEG C for 25 to 30 minutes, and cooling to room temperature to obtain the finished product pellet ore. The pellet ore prepared by the method has proper alkalinity and metallurgical property, is favorable for optimizing the burden structure of a blast furnace, reducing the coke ratio of the blast furnace and increasing the yield of the blast furnace, and has a good popularization and application value.

Description

A kind ofly smelt that character is good, pellet that basicity is suitable and preparation method thereof
Technical field
The invention belongs to metallurgical material technical field of modification, be specifically related to a kind ofly to smelt that character is good, pellet that basicity is suitable and preparation method thereof.
Background technology
The pellet basicity of not producing with addition of flux is generally on the low side, and thermal characteristics is not good, limits the further increase of pellet in blast furnace materials ratio, and basicity metallurgical properties on the low side is slightly poor, also counteracts that the continuous lifting of blast-furnace smelting level.Therefore, in pellet is produced, often allocate a certain amount of alkaline matter into improve the basicity of pellet, to make up pellet physical and chemical performance and metallurgical performance, the especially deficiency of reductibility and reduction swellability performance.Improve in the technique of pellet basicity at interpolation flux, whether the quality of flux physico-chemical property, the setting of joining ore deposit scheme and roasting parameter be reasonable, has conclusive impact to every character of finished ball nodulizing.Therefore, research and develop a kind of raw material physico-chemical property desirable, mineral mixture ratio is suitable for, manufacture craft is simple, and metallurgical performance is excellent, the reliable pellet of steady quality and process for producing thereof, for optimization Bf Burden, improve ironmaking technology economic target, be all of great practical significance.
Summary of the invention
The first object of the present invention is that providing a kind of smelts the pellet that character is good, basicity is suitable, and the second object of the present invention is the preparation method providing described pellet.
The first object of the present invention be achieved in that a kind ofly smelt that character is good, pellet that basicity is suitable, the reduction degree index of described pellet is 64.00 ~ 67.00%.
The second object of the present invention is achieved in that the preparation method of the pellet that a kind of described smelting character is good, basicity is suitable for, and comprises pulverizing, mixing, pelletizing and calcining process, specifically comprises:
A, pulverizing: it is 10 ~ 15mm that Wingdale or rhombspar are crushed to granularity, then is ground into the powder of granularity≤0.074mm;
B, mixing: by limestone powder or ground dolomite according to the consumption of 2.8 ~ 5.3%, add in Iron concentrate, and mix, obtain mixing mineral aggregate;
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8 ~ 9%, in balling disc, carries out pelletizing, obtain green-ball;
D: roasting: in stoving oven, first by green-ball at 200 ~ 960 DEG C, drying and preheating 12 ~ 17min, then at 1250 ~ 1280 DEG C, roasting 25 ~ 30min, then be cooled to normal temperature, obtains finished ball nodulizing.
The method of the invention increases the addition of limestone powder or ground dolomite by appropriateness, make finished ball nodulizing basicity be improved significantly, reduction degree index adds 4.53 ~ 5.72% and 1.36 ~ 2.29% respectively, effectively improves the metallurgical performance of pellet.Secondly, the method for the invention, for the adjustment of limestone powder or ground dolomite addition, changes the size of raw material, and in prepared limestone powder and ground dolomite, the content of the particulate of granularity < 0.074mm reaches more than 90%.Overcome because flux proportioning improves the technical problem that the mixing mineral aggregate balling-up that causes reduces, be conducive to the improvement of green-ball physico-chemical property and mechanical strength, the green-ball degree of compactness produced is higher, preheating, firing stage reaction also more completely, fully.In addition, consider that in pelletizing, flux amount increases, need more heat to meet roasting demand, the method for the invention also have adjusted the temperature and time of preheating, roasting, realizes the fully oxidized and consolidation of decomposition and the pelletizing completely of flux.The pellet adopting the method for the invention to prepare has suitable reductibility, soft heat and reduction swellability, is conducive to optimizing Bf Burden, reduces blast furnace coke ratio, improves furnace processor, has good application value.
Accompanying drawing explanation
fig. 1 is present invention process schematic flow sheet.
Embodiment
The present invention is further illustrated below, but limited the present invention never in any form, and any conversion done based on training centre of the present invention or replacement, all belong to protection scope of the present invention.
The pellet that smelting character of the present invention is good, basicity is suitable, the reduction degree index of described pellet is 64.00 ~ 67.00%.
Described pellet is by the consumption according to 2.8 ~ 5.3% in Iron concentrate, and the limestone powder of interpolation granularity≤0.074mm or ground dolomite are made.
The addition of described limestone powder is 2.8 ~ 3.5%, and the addition of described ground dolomite is 4.8 ~ 5.3%.
Described pellet adopts following method to prepare:
A, pulverizing: it is 10 ~ 15mm that Wingdale or rhombspar are crushed to granularity, then is ground into the powder of granularity≤0.074mm;
B, mixing: by limestone powder or ground dolomite according to the consumption of 2.8 ~ 5.3%, add in Iron concentrate, and mix, obtain mixing mineral aggregate;
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8 ~ 9%, in balling disc, carries out pelletizing, obtain green-ball;
D: roasting: in stoving oven, first by green-ball at 200 ~ 960 DEG C, drying and preheating 12 ~ 17min, then at 1250 ~ 1280 DEG C, roasting 25 ~ 30min, then be cooled to normal temperature, obtains finished ball nodulizing.
A preparation method for the pellet that described smelting character is good, basicity is suitable for, is characterized in that comprising pulverizing, mixing, pelletizing and calcining process, specifically comprises:
A, pulverizing: it is 10 ~ 15mm that Wingdale or rhombspar are crushed to granularity, then is ground into the powder of granularity≤0.074mm;
B, mixing: by limestone powder or ground dolomite according to the consumption of 2.8 ~ 5.3%, add in Iron concentrate, and mix, obtain mixing mineral aggregate;
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8 ~ 9%, in balling disc, carries out pelletizing, obtain green-ball;
D: roasting: in stoving oven, first by green-ball at 200 ~ 960 DEG C, drying and preheating 12 ~ 17min, then at 1250 ~ 1280 DEG C, roasting 25 ~ 30min, then be cooled to normal temperature, obtains finished ball nodulizing.
In described steps A and step B, in limestone powder, the content of calcium oxide (CaO) is 53.0 ~ 54.3%, and in ground dolomite, the content of magnesium oxide (MgO) is 19.5 ~ 20.4%.
In described steps A and step B, in limestone powder, the content of calcium oxide (CaO) is 53.7%, and in ground dolomite, the content of magnesium oxide (MgO) is 19.9%.
In described steps A and step B, in limestone powder, ground dolomite, the content of the particulate of granularity < 0.074mm is 90 ~ 95%.
In described steps A, what fragmentation adopted is jaw crusher, and what pulverize employing is raymond mill.
In described step B, the addition of limestone powder is preferably 2.8 ~ 3.5%, and the addition of ground dolomite is preferably 4.8 ~ 5.3%.
In described step B, the granularity≤0.074mm of Iron concentrate, the chemical composition of Iron concentrate is: TFe63%, SiO 28%, CaO0.5%, MgO0.9%, Al 2o 31.4%.
In described step B, in Iron concentrate, the content of the particulate of granularity < 0.074mm is 90 ~ 95%.
In described step C, the speed setting of balling disc is 7 ~ 8r/min, and inclination angle is 46 ~ 48 °.
In described step D, what stoving oven adopted is drying grate---rotary kiln.
In described step D, preferably first by green-ball at 350 ~ 950 DEG C, drying and preheating 13 ~ 14min, then at 1260 ~ 1270 DEG C, roasting 27 ~ 28min, then be cooled to normal temperature, obtains finished ball nodulizing.
In described step D, normal temperature refers to 15 ~ 25 DEG C.
embodiment 1
A, pulverizing: be that to be crushed to granularity be 10 ~ 15mm for the jaw crusher of the Wingdale PE150 × 250 model number of 53.7% by calcium oxide content, be ground into the powder of granularity≤0.074mm again with the raymond mill of YGM9517 model, in powder, the content of the particulate of granularity < 0.074mm reaches 90%.
B, mixing: by limestone powder according to 2.8% consumption add in Iron concentrate, in Iron concentrate, the content of the particulate of granularity < 0.074mm is 92%, the two is mixed, and obtains mixing mineral aggregate.
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8%, and in the balling disc of Ф 6000 × 600 model, carry out pelletizing, the speed setting of balling disc is 7r/min, and inclination angle is 47 °, obtains green-ball.
D: roasting: at the drying grate of Ф 5000 × 33000 model---in rotary kiln, first by green-ball at 350 ~ 950 DEG C, drying and preheating 14min, then at 1260 DEG C, roasting 28min, then be cooled to normal temperature, obtains finished ball nodulizing.
(basicity is 0.25 times to the finished ball nodulizing adopting the method for the invention to produce, reduction degree index is 66.17%) and do not add flux modification, (basicity is 0.06 times for all the other proportioning raw materials and the same pellet of production technique, reduction degree index is 63.3%) compare, pellet basicity improves 0.19 times, and reduction degree index improves 4.53%.
embodiment 2
A, pulverizing: be that to be crushed to granularity be 10 ~ 15mm for the jaw crusher of the Wingdale PE150 × 250 model number of 53.7% by calcium oxide content, be ground into the powder of granularity≤0.074mm again with the raymond mill of YGM9517 model, in powder, the content of the particulate of granularity < 0.074mm reaches 92%.
B, mixing: by limestone powder according to 3.5% consumption add in Iron concentrate, in Iron concentrate, the content of the particulate of granularity < 0.074mm is 93%, the two is mixed, and obtains mixing mineral aggregate.
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 9%, and in the balling disc of Ф 6000 × 600 model, carry out pelletizing, the speed setting of balling disc is 8r/min, and inclination angle is 46 °, obtains green-ball.
D: roasting: at the drying grate of Ф 5000 × 33000 model---in rotary kiln, first by green-ball at 350 ~ 950 DEG C, drying and preheating 13min, then at 1270 DEG C, roasting 26min, then be cooled to normal temperature, obtains finished ball nodulizing.
(basicity is 0.30 times to the finished ball nodulizing adopting the method for the invention to produce, reduction degree index is 66.92%) and do not add flux modification, (basicity is 0.06 times for all the other proportioning raw materials and the same pellet of production technique, reduction degree index is 63.3%) compare, pellet basicity improves 0.24 times, and reduction degree index improves 5.72%.
embodiment 3
A, pulverizing: be that to be crushed to granularity be 10 ~ 15mm for the jaw crusher of the rhombspar PE150 × 250 model number of 19.9% by content of magnesia, be ground into the powder of granularity≤0.074mm again with the raymond mill of YGM9517 model, in powder, the content of the particulate of granularity < 0.074mm reaches 93%.
B, mixing: by ground dolomite according to 4.8% consumption add in Iron concentrate, in Iron concentrate, the content of the particulate of granularity < 0.074mm is 91%, the two is mixed, and obtains mixing mineral aggregate.
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8%, and in the balling disc of Ф 6000 × 600 model, carry out pelletizing, the speed setting of balling disc is 7r/min, and inclination angle is 48 °, obtains green-ball.
D: roasting: at the drying grate of Ф 5000 × 33000 model---in rotary kiln, first by green-ball at 200 ~ 560 DEG C, drying and preheating 12min, then at 1250 DEG C, roasting 30min, then be cooled to normal temperature, obtains finished ball nodulizing.
(basicity is 0.25 times to the finished ball nodulizing adopting the method for the invention to produce, reduction degree index is 64.16%) and do not add flux modification, (basicity is 0.06 times for all the other proportioning raw materials and the same pellet of production technique, reduction degree index is 63.3%) compare, pellet basicity improves 0.19 times, and reduction degree index improves 1.36%.
embodiment 4
A, pulverizing: be that to be crushed to granularity be 10 ~ 15mm for the jaw crusher of the rhombspar PE150 × 250 model number of 19.9% by content of magnesia, be ground into the powder of granularity≤0.074mm again with the raymond mill of YGM9517 model, in powder, the content of the particulate of granularity < 0.074mm reaches 95%.
B, mixing: by ground dolomite according to 5.3% consumption add in Iron concentrate, in Iron concentrate, the content of the particulate of granularity < 0.074mm is 94%, the two is mixed, and obtains mixing mineral aggregate.
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 9%, and in the balling disc of Ф 6000 × 600 model, carry out pelletizing, the speed setting of balling disc is 8r/min, and inclination angle is 47 °, obtains green-ball.
D: roasting: at the drying grate of Ф 5000 × 33000 model---in rotary kiln, first by green-ball at 500 ~ 700 DEG C, drying and preheating 17min, then at 1280 DEG C, roasting 25min, then be cooled to normal temperature, obtains finished ball nodulizing.
(basicity is 0.30 times to the finished ball nodulizing adopting the method for the invention to produce, reduction degree index is 64.75%) and do not add flux modification, (basicity is 0.06 times for all the other proportioning raw materials and the same pellet of production technique, reduction degree index is 63.3%) compare, pellet basicity improves 0.24 times, and reduction degree index improves 2.29%.

Claims (4)

1. smelt the pellet that character is good, basicity is suitable for one kind, it is characterized in that described pellet is by the consumption according to 2.8 ~ 3.5% in Iron concentrate, the limestone powder adding granularity≤0.074mm is made, and the granularity≤0.074mm of Iron concentrate, the chemical composition of Iron concentrate is TFe 63%, SiO 28%, CaO 0.5%, MgO 0.9%, Al 2o 31.4%, in limestone powder, the content of calcium oxide is 53.0 ~ 54.3%, and reduction degree index is 66.17 ~ 66.92%, and reduction degree index improves 4.53 ~ 5.72%; Described pellet adopts following method to prepare:
A, pulverizing: be 10 ~ 15mm to granularity by limestone crushing, then be ground into the powder of granularity≤0.074mm;
B, mixing: by limestone powder according to the consumption of 2.8 ~ 3.5%, add in Iron concentrate, and mix, obtain mixing mineral aggregate;
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8 ~ 9%, in balling disc, carries out pelletizing, obtain green-ball;
D: roasting: in stoving oven, first by green-ball at 350 ~ 950 DEG C, drying and preheating 12 ~ 17min, then at 1250 ~ 1280 DEG C, roasting 25 ~ 30min, then be cooled to normal temperature, obtains finished ball nodulizing.
2. smelt the pellet that character is good, basicity is suitable for one kind, it is characterized in that described pellet is by the consumption according to 4.8 ~ 5.3% in Iron concentrate, the ground dolomite adding granularity≤0.074mm is made, and the granularity≤0.074mm of Iron concentrate, the chemical composition of Iron concentrate is TFe 63%, SiO 28%, CaO 0.5%, MgO 0.9%, Al 2o 31.4%, in ground dolomite, magnesian content is 19.5 ~ 20.4%, and reduction degree index is 64.16 ~ 64.75%, and reduction degree index improves 1.36 ~ 2.29%; Described pellet adopts following method to prepare:
A, pulverizing: ground dolomite being crushed to granularity is 10 ~ 15mm, then is ground into the powder of granularity≤0.074mm;
B, mixing: by ground dolomite according to the consumption of 4.8 ~ 5.3%, add in Iron concentrate, and mix, obtain mixing mineral aggregate;
C, pelletizing: the moisture of mixing mineral aggregate is adjusted to 8 ~ 9%, in balling disc, carries out pelletizing, obtain green-ball;
D: roasting: in stoving oven, first by green-ball at 200 ~ 700 DEG C, drying and preheating 12 ~ 17min, then at 1250 ~ 1280 DEG C, roasting 25 ~ 30min, then be cooled to normal temperature, obtains finished ball nodulizing.
3. pellet according to claim 1, is characterized in that in described steps A, B, and the limestone powder fine particle content of granularity < 0.074mm is 90 ~ 95%.
4. pellet according to claim 2, is characterized in that in described steps A, B, and the ground dolomite fine particle content of granularity < 0.074mm is 90 ~ 95%.
CN201310669712.8A 2013-12-11 2013-12-11 Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof Active CN103614551B (en)

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CN104458795A (en) * 2014-12-01 2015-03-25 武钢集团昆明钢铁股份有限公司 Method for rapidly and accurately measuring cracking temperature of green pellets
CN108866325A (en) * 2017-07-14 2018-11-23 淮北益嘉益新材料科技有限公司 A method of improving magnesian flux bursting temperature of pellet ores
CN113930612A (en) * 2021-10-15 2022-01-14 四川德胜集团钒钛有限公司 Limestone alkaline pellet and preparation process thereof

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CN102766763A (en) * 2012-08-01 2012-11-07 山西太钢不锈钢股份有限公司 Manufacturing method of magnesian pellets

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US4963185A (en) * 1974-08-01 1990-10-16 Applied Industrial Materials Corporation Agglomerates containing olivine for use in blast furnace
CN102766763A (en) * 2012-08-01 2012-11-07 山西太钢不锈钢股份有限公司 Manufacturing method of magnesian pellets

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