CN102399978B - Manufacture method of iron ore MgO pellet ore - Google Patents
Manufacture method of iron ore MgO pellet ore Download PDFInfo
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- CN102399978B CN102399978B CN 201110352261 CN201110352261A CN102399978B CN 102399978 B CN102399978 B CN 102399978B CN 201110352261 CN201110352261 CN 201110352261 CN 201110352261 A CN201110352261 A CN 201110352261A CN 102399978 B CN102399978 B CN 102399978B
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Abstract
A manufacture method of an iron ore MgO pellet ore is especially suitable for factories employing a grate-kiln technology to produce MgO pellet ore. The method comprises steps of burdening, grinding of part of a mixture, mixing, pelletizing and roasting, and is characterized in that part of iron ore powder and high MgO content flux are mixed first, treated with a pretreatment of grinding, then mixed, pelletized and roasted with residual iron ore powder and bentonite. According to the invention, a flux with a MgO content of 60-80% is added into the iron ore powder to generate MgO pellet ore when a flux proportioning is low, so as to avoid disadvantages of decreased pellet ore iron grade and changed pellet ore CaO caused by addition of a large proportion of a flux like dolomite. The pretreatment of grinding on MgO flux and part of the iron ore powder can reduce a pellet preheating temperature and enhance strength of pellet entering into the rotary kiln, so as to solve technical problems of high preheating temperature and low preheating pellet strength in production of MgO pellet ore.
Description
Technical field
The present invention relates to a kind of manufacture method of iron ore MgO pellet ore, it is specially adapted to adopt the chain grate-rotary kiln production line to produce the enterprise of MgO pelletizing.
Background technology
The MgO pellet can improve its high temperature metallurgical properties, and blast-furnace smelting is improved in the following aspects: (1) coke ratio reduces; (2) productivity improves; (3) prolong the blast furnace lining life-span.At present, the production of MgO pellet mainly is with addition of flux such as rhombspar, serpentine, wagnerites, with addition of above-mentioned flux, pellet MgO content when improving, also subsidiary CaO, the SiO that has improved pellet
2Content causes pellet iron grade to reduce, simultaneously dual alkalinity (the CaO ∕ SiO of pellet
2) also improve.
Therefore during the blast furnace adapted, also need the basicity of other furnace charge (such as agglomerate) is adjusted, larger to whole blast furnace burden systematic influence.The preheating of MgO pellet and maturing temperature are higher in addition, during with grate kiln explained hereafter MgO pellet, the preheating temperature of drying grate need reach more than 1000 ℃, the intensity in guarantee preheated pellets ore deposit reaches more than the 400N ∕ ball, and after preheating temperature surpasses 1000 ℃, drying grate is at high temperature worked for a long time, equipment breakdown easily occurs.
The maturing temperature of drying grate is more than 1000 ℃ the time, if long-time the use easily damaged the grate plate of drying grate, and other rotary kiln baking temperature easy ring formation more than 1250 ℃ the time.
The below is conventional MgO pellet production craft step:
(1) batching:
Powdered iron ore, ground dolomite and wilkinite carry out weigh batching by following weight percent, and concrete proportioning is:
Powdered iron ore 89
%;
Ground dolomite 9
%;
Wilkinite 2.0
%,
Wherein powdered iron ore is Dai County's powdered iron ore, and granularity is 75% less than the content of 0.074mm, and the water ratio of powdered iron ore is 8.5%; The granularity of ground dolomite is 83% for the ratio less than 0.074mm.
(2) mixing pelletizing
Above-mentioned powdered iron ore, ground dolomite and wilkinite through the mixer mixing, are then added in the balling disc make up water pelletizing and produce pelletizing, obtain water ratio and be 9.0%(by weight percentage) pelletizing, particle diameter is 9mm-15mm;
(4) roasting
Carry out cloth, roasting at chain grate-rotary kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and the drying grate preheating temperature is 950-1000 ℃, and the rotary kiln baking temperature is 1210-1260 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was a 284N ∕ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach a 312N ∕ pelletizing,
When the drying grate preheating temperature was 1000 ℃, preheated pellets intensity can reach 387 a ∕ pelletizing,
When the drying grate preheating temperature was 1030 ℃, preheated pellets intensity can reach 457 a ∕ pelletizing,
When the rotary kiln baking temperature was 1210 ℃, finished ball intensity was a 2513N ∕ pelletizing;
When the rotary kiln baking temperature was 1240 ℃, finished ball intensity was a 2741N ∕ pelletizing.
Wherein finished ball nodulizing TFe is that 59.8%, MgO content is 2.12%, SiO
2Be that 6.03%, CaO is 4.65%.
Summary of the invention:
For the above-mentioned deficiency of the manufacture method that overcomes existing MgO pelletizing, the invention provides a kind of manufacture method of MgO pelletizing, have preheating temperature with the MgO pelletizing of present method manufacturing low, the pre-high characteristics of hot-bulb intensity, and can not affect the SiO of pellet
2Content with CaO.
The present invention includes batching, compound and partly moisten mill, mixing, pelletizing and roasting, after it is characterized in that first the powdered iron ore of a part and high MgO content flux mixed, carried out in advance the pre-treatment of profit mill, and then with remaining powdered iron ore and wilkinite mixing, pelletizing, roasting; Operation steps is successively:
(1) batching: powdered iron ore is 95-97 by weight percentage
%High MgO content flux is 2-4
%;Wilkinite is 0.5-2
%
Described high MgO content flux is that MgO content is 60%-80%;
(2) powdered iron ore and high MgO content flux profit mill pre-treatment:
The powdered iron ore of getting a part in the above-mentioned powdered iron ore and be 40%-97% is dried in rotary drum dryer, make the water ratio of powdered iron ore be not more than 6.5%, after mixing with high MgO content flux, compound sent into moisten the mill pre-treatment in the damp mill, be referred to as profit mill pre-treatment mixture, powdered iron ore brings up to 80%-90% less than the ratio of 0.074mm in the profit mill pre-treatment mixture;
(3) mixing pelletizing: will moisten powdered iron ore that mill pre-treatment mixture and remaining profit grind and wilkinite again through the mixer mixing, then add the pelletizing that keeps the skin wet in the balling disc and produce pelletizing, obtaining water ratio is 9.0%-9.6%, pelletizing by weight percentage, pelletizing particle diameter are 9mm-15mm;
(4) roasting: above-mentioned pelletizing is carried out cloth, roasting at chain grate-rotary kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 150-220 ℃, and the exhausting temperature is 220-260 ℃, and the drying grate preheating temperature is 900-1000 ℃, and the rotary kiln baking temperature is 1200-1250 ℃.
The drying grate preheating temperature is different, and preheated pellets intensity is also different, and in 900-1000 ℃ of scope, the higher preheated pellets intensity of drying grate preheating temperature is higher.
Described high MgO content flux is the product that Jianping, Liaoning Province wilkinite company limited produces.
The MgO pelletizing made from the present invention, when the preheating temperature of MgO pelletizing was 900-1000 ℃, its pre-hot-bulb intensity can be greater than to 400 a N ∕ pelletizing, and the intensity of finished ball can be greater than reaching 2500 a N ∕ pelletizing.
Beneficial effect of the present invention: (1) by in powdered iron ore with addition of MgO content be flux about 60%-80%, can be in the situation that the lower production of flux proportioning MgO pellet, avoided vast scale to cause pellet iron grade to descend with addition of the flux such as rhombspar and the shortcoming that changes has also occured pellet CaO.(2) adopt the profit grinding process that MgO flux and powdered iron ore are moistened mill in advance, can reduce the pelletizing preheating temperature, simultaneously the intensity that pelletizing enters rotary kiln can also be improved, the technical barrier that preheating temperature is high, preheated pellets intensity is low that runs into when producing the MgO pellet can be solved to a certain extent; (3) after the pre-treatment of powdered iron ore profit mill, bentonitic proportioning also can reduce, and is conducive to improve pellet iron grade.
Embodiment
Further specify the specific embodiment of the present invention below by embodiment, but the specific embodiment of the present invention is not limited to following examples.
High MgO content flux among following 3 embodiment all is products that Jianping, Liaoning Province wilkinite company limited produces.
Embodiment 1
The present embodiment moistens the mill pre-treatment to the powdered iron ore of about 40% in high MgO content flux and the batching.
(1) batching:
Carrying out weigh batching by following weight percent is:
Powdered iron ore 96.5
%;
High MgO content flux 2
%
Wilkinite 1.5
%,
Wherein powdered iron ore is Dai County's powdered iron ore, and granularity is 75% less than the content of 0.074mm, and the water ratio of powdered iron ore is 8.5%; The MgO content of high MgO content flux is 78%.
(2) powdered iron ore and high MgO content flux profit mill pre-treatment:
Get the part namely 40% in the powdered iron ore, after the oven dry, the water ratio that makes powdered iron ore is 6.4% in rotary drum dryer, then moistens the mill pre-treatment in the damp mill with sending into after high MgO content flux mixes, and makes powdered iron ore bring up to 81% less than the ratio of 0.074mm;
(3) mixing pelletizing
With above-mentioned mixture through the profit pretreated powdered iron ore of mill and high MgO content flux, with the powdered iron ore of remaining 56.5% not profit mill and wilkinite again through the mixer mixing, then add the pelletizing that keeps the skin wet in the balling disc and produce pelletizing, obtain water ratio and be 9.1%(by weight percentage) pelletizing, the pelletizing particle diameter is 9mm-15mm;
(4) roasting
Carry out cloth, roasting at chain grate-rotary kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and the drying grate preheating temperature is 950-1000 ℃, and the rotary kiln baking temperature is 1210-1260 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was a 423N ∕ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach a 495N ∕ pelletizing,
When the drying grate preheating temperature was 1000 ℃, preheated pellets intensity can reach 557 a ∕ pelletizing,
When the rotary kiln baking temperature was 1210 ℃, finished ball intensity was a 2542N ∕ pelletizing;
When the rotary kiln baking temperature was 1240 ℃, finished ball intensity was a 2835N ∕ pelletizing.
Wherein finished ball nodulizing TFe is that 63.1%, MgO content is 2.05%, SiO
2Be that 5.86%, CaO is 0.64%.
Embodiment 2
The present embodiment moistens the mill pre-treatment to the powdered iron ore of about 50% in high MgO content flux and the batching.
The concrete steps of the present embodiment are as follows:
(1) batching:
Carry out weigh batching by following weight percent:
Powdered iron ore 96.5%;
High MgO content flux 2%;
Wilkinite 1.5%,
Wherein powdered iron ore is Dai County's powdered iron ore, and granularity is 75% less than the content of 0.074mm, and the water ratio of powdered iron ore is 8.5%; The MgO content of high MgO content flux is 78%.
(2) powdered iron ore and high MgO content flux profit mill pre-treatment:
After getting a part in the above-mentioned powdered iron ore namely 48% powdered iron ore being dried in rotary drum dryer, the water ratio of powdered iron ore is 6.3%, moisten the mill pre-treatment in the damp mill with sending into after high MgO content flux mixes, make powdered iron ore bring up to 80% less than the ratio of 0.074mm;
(3) mixing pelletizing
With above-mentioned mixture through the profit pretreated powdered iron ore of mill and high MgO content flux, with remaining 48.5% the powdered iron ore of profit mill and wilkinite again through the mixer mixing, then add in the balling disc make up water pelletizing and produce pelletizing, obtain water ratio and be 9.0%(by weight percentage) pelletizing, particle diameter is 9mm--15mm;
(4) roasting
Carry out cloth, roasting at chain grate-rotary kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and the drying grate preheating temperature is 950-1000 ℃, and the rotary kiln baking temperature is 1210-1260 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was a 478N ∕ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach a 512N ∕ pelletizing,
When the drying grate preheating temperature was 1000 ℃, preheated pellets intensity can reach 588 a ∕ pelletizing,
When the rotary kiln baking temperature was 1210 ℃, finished ball intensity was a 2587N ∕ pelletizing;
When the rotary kiln baking temperature was 1240 ℃, finished ball intensity was a 2912N ∕ pelletizing.
Wherein finished ball nodulizing TFe is that 63.1%, MgO content is 2.05%, SiO
2Be that 5.86%, CaO is 0.64%.
Embodiment 3
The present embodiment moistens the mill pre-treatment to about 50% powdered iron ore and high MgO content flux, but strengthened high MgO content flux with addition of amount, become 2.5% by 2% of embodiment 1 and embodiment 2.
The concrete steps of the present embodiment are as follows:
(1) batching:
Powdered iron ore, high MgO content flux and wilkinite carry out weigh batching by following weight percent, and concrete proportioning is:
Powdered iron ore 96%;
High MgO content flux 2.5%;
Wilkinite 1.5%,
Wherein powdered iron ore is Dai County's powdered iron ore, and granularity is 75% less than the content of 0.074mm, and the water ratio of powdered iron ore is 8.5%; The MgO content of high MgO content flux is 78%.
(2) powdered iron ore and high MgO content flux profit mill pre-treatment:
After getting a part namely 48% powdered iron ore being dried in rotary drum dryer, the water ratio of powdered iron ore is 6.4%, moistens the mill pre-treatment in the damp mill with sending into after high MgO content flux mixes, and makes powdered iron ore bring up to 82% less than the ratio of 0.074mm;
(3) mixing pelletizing
With above-mentioned mixture through the profit pretreated powdered iron ore of mill and high MgO content flux, with remaining 48% the powdered iron ore of profit mill and wilkinite again through the mixer mixing, then add in the balling disc make up water pelletizing and produce pelletizing, obtain water ratio and be 9.1%(by weight percentage) pelletizing, median size is 9mm-15mm;
(4) roasting
Carry out cloth, roasting at chain grate-rotary kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and the drying grate preheating temperature is 950-1000 ℃, and the rotary kiln baking temperature is 1210-1260 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was a 405N ∕ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach a 498N ∕ pelletizing,
When the drying grate preheating temperature was 1000 ℃, preheated pellets intensity can reach 524 a ∕ pelletizing,
When the rotary kiln baking temperature was 1210 ℃, finished ball intensity was a 2502N ∕ pelletizing;
When the rotary kiln baking temperature was 1240 ℃, finished ball intensity was a 2875N ∕ pelletizing.
Wherein finished ball nodulizing TFe is that 62.7%, MgO content is 2. 5%, SiO
2Be that 5.83%, CaO is 0.73%.
Above embodiment and common process are produced the method contrast of MgO pellet, when with addition of ground dolomite, and when breeze grinds pre-treatment without profit, when preheating temperature below 1000 ℃ the time, preheated pellets ore deposit intensity is lower than 400 a N ∕ pelletizing, when preheating temperature surpasses 1000 ℃ when reaching 1030 ℃, preheated pellets ore deposit intensity just surpasses 400 a N ∕ pelletizing, reach 417 a N ∕ pelletizing, and pellet iron grade is low, CaO content is also high.
And for embodiments of the invention, for implementing 1, after the powdered iron ore about 40% and high MgO content flux moisten the mill pre-treatment, in the situation that pellet MgO content substantially close (about 2.1%), when preheating temperature only is 960 ℃, preheated pellets ore deposit intensity just surpasses 400 a N ∕ pelletizing, reaches 423 a N ∕ pelletizing; And because of powdered iron ore through the pre-treatment of profit mill, bentonitic proportioning is reduced to 1.5% by 2%, MgO flux is also lower with addition of amount simultaneously, so pellet iron grade is high than the benchmark example.
For implementing 2, when the profit of further raising powdered iron ore was ground ratio to 50% left and right sides, in the situation that pellet MgO content substantially close (about 2.1%), when preheating temperature only was 960 ℃, intensity further promoting or transferring in preheated pellets ore deposit was to 478 a N ∕ pelletizing.
For implementing 3, keeping the profit mill ratio of powdered iron ore is about 50%, and further improves about pellet MgO content to 2.5%, and when preheating temperature is 960 ℃, preheated pellets ore deposit intensity also can surpass 400 N ∕ more than the pelletizing, reaches 405 a N ∕ pelletizing.
Therefore, the MgO pellet that adopts method provided by the invention to produce has low, the pre-hot-bulb intensity of preheating temperature high, and pellet iron of high grade, do not affect the characteristics such as pellet CaO content.
Claims (1)
1. the manufacture method of an iron ore MgO pellet ore, comprise that batching, compound partly moisten mill, mixing, pelletizing and roasting, after it is characterized in that first the powdered iron ore of a part and high MgO content flux mixed, carried out in advance the pre-treatment of profit mill, and then with remaining powdered iron ore and wilkinite mixing, pelletizing, roasting; Operation steps is successively:
(1) batching: powdered iron ore is 95-97 by weight percentage
%High MgO content flux is 2-4
%;Wilkinite is 0.5-2
%, described high MgO content flux is that MgO content is 60%-80%;
(2) compound partly moistens mill:
The powdered iron ore of getting a part in the above-mentioned powdered iron ore and be 40%-48% is dried in rotary drum dryer, make the water ratio of powdered iron ore be not more than 6.5%, after mixing with high MgO content flux, compound sent into moisten the mill pre-treatment in the damp mill, be referred to as profit mill pre-treatment mixture, powdered iron ore brings up to 80%-90% less than the ratio of 0.074mm in the profit mill pre-treatment mixture;
(3) mix, pelletizing: will moisten mill pre-treatment mixture and the remaining powdered iron ore of grinding and the wilkinite of moistening again through the mixer mixing, then add the pelletizing that keeps the skin wet in the balling disc and produce pelletizing, obtain by weight percentage, water ratio is 9.0%-9.6% pelletizing, and the pelletizing particle diameter is 9mm-15mm;
(4) roasting: above-mentioned pelletizing is carried out cloth, roasting at chain grate-rotary kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 150-220 ℃, and the exhausting temperature is 220-260 ℃, and the drying grate preheating temperature is 900-1000 ℃, and the rotary kiln baking temperature is 1200-1250 ℃.
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|---|---|---|---|
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|---|---|---|---|
| CN 201110352261 CN102399978B (en) | 2011-11-09 | 2011-11-09 | Manufacture method of iron ore MgO pellet ore |
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| CN102399978A CN102399978A (en) | 2012-04-04 |
| CN102399978B true CN102399978B (en) | 2013-02-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104673948A (en) * | 2015-01-30 | 2015-06-03 | 中南大学 | Iron making furnace burden and mineralizing method of iron making furnace burden |
| CN105063347B (en) * | 2015-08-26 | 2017-04-26 | 山西太钢不锈钢股份有限公司 | Method for producing pellets with discarded calcium magnesium bricks |
| CN106978533A (en) * | 2017-03-01 | 2017-07-25 | 江苏省冶金设计院有限公司 | Prepare the method and system of gas-based shaft kiln acid pellet |
| CN110106351B (en) * | 2019-04-19 | 2021-10-22 | 承德信通首承科技有限责任公司 | Production method of high-magnesium pellet ore |
| CN110982971B (en) * | 2019-11-13 | 2021-10-22 | 鞍钢集团矿业有限公司 | MgO optimal distribution method for blast furnace iron-containing furnace burden |
| CN111235383B (en) * | 2019-12-30 | 2022-01-14 | 武钢资源集团乌龙泉矿业有限公司 | Method for producing sintered ore by adding and using low magnesium resource |
| CN114836616B (en) * | 2022-04-01 | 2023-12-29 | 山西太钢不锈钢股份有限公司 | Iron ore powder pellet and preparation method thereof |
| CN115198087B (en) * | 2022-06-23 | 2023-04-25 | 华北理工大学 | Method for inhibiting looping of high-silicon magnesium flux pellet rotary kiln |
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| CN100465306C (en) * | 2006-11-30 | 2009-03-04 | 武汉钢铁(集团)公司 | Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same |
| CN101550484A (en) * | 2008-03-31 | 2009-10-07 | 鞍钢股份有限公司 | Acidic magnesium oxide pellet and preparation method thereof |
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