CN102485921A - Pellet production method of vanadium-titanium magnetite concentrate - Google Patents
Pellet production method of vanadium-titanium magnetite concentrate Download PDFInfo
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- CN102485921A CN102485921A CN2010105793374A CN201010579337A CN102485921A CN 102485921 A CN102485921 A CN 102485921A CN 2010105793374 A CN2010105793374 A CN 2010105793374A CN 201010579337 A CN201010579337 A CN 201010579337A CN 102485921 A CN102485921 A CN 102485921A
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Abstract
The invention relates to a pellet production method of a vanadium-titanium magnetite concentrate. The method comprises the following steps of: (1) conducting roll milling to a vanadium-titanium magnetite concentrate with a high pressure roller mill so as to obtain vanadium-titanium magnetite concentrate; (2) adding water and a binder into the vanadium-titanium magnetite concentrate powder to obtain a uniformly mixed material; (3) pelletizing the material with a pelletizer. Under the premise of guaranteeing that the green pellet drop strength, green pellet compression strength, green pellet cracking temperature, dry pellet compression strength, roasted pellet compression strength and other metallurgy performances can basically satisfy production needs simultaneously, the pellet concentrate produced by the method of the invention improves the pellet forming rate of a vanadium-titanium magnetite concentrate, reduces the adding amount of bentonite, and enhances the grade of iron sent into a furnace.
Description
Technical field
The present invention relates to a kind of pellet formation method.
Background technology
Vanadium titano-magnetite is a kind of coarse size, iron grade 53%, contain the difficult magnetite of smelting of complicated difficult choosing of titanium oxide 12%, Vanadium Pentoxide in FLAKES about 0.6%; Its balling-up sex index belongs to no balling-up property or weak balling-up property at 0.2-0.3, and China's v-ti magnetite bed distributes extensively; Reserves are abundant; Reserves and produced quantity occupy the 3rd of national iron ore, and proven reserve are 98.3 hundred million tons, and prospective reserves reaches more than 30,000,000,000 tons.
The method that improves the v-ti magnetite concentrate balling ratio at present has two kinds: (1) is improved the sticker performance or is changed the sticker kind.Normally used method is with addition of wilkinite in v-ti magnetite concentrate.(2) v-ti magnetite concentrate is carried out secondary and grind, further the refinement particle.Means commonly used at present are to adopt ball mill that v-ti magnetite concentrate is moistened mill.
But bentonitic adding will be brought silicate into, and the wilkinite add-on is many more, and roasting pelletizing iron grade is low more, and the blast furnace ironmaking quantity of slag is high more.And ball mill energy consumption and wearing and tearing make profit mill productive expense very high, and noise is big simultaneously.
High-pressure roller mill is since being born, because of its good ore grinding performance and energy-saving and cost-reducing advantage extensively receive scientific worker's favor.But high-pressure roller mill all is blank for the pretreatment technology of v-ti magnetite concentrate at home and even abroad.
Summary of the invention
The object of the present invention is to provide a kind of pellet formation method of v-ti magnetite concentrate, reduce production costs, improve the concentrate balling ratio, reduction bentonite consumption and then raising blast furnace feeding furnace charge grade also cut down the consumption of energy.
The pellet formation method of v-ti magnetite concentrate of the present invention may further comprise the steps: (1) uses high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, to obtain the v-ti magnetite concentrate powder; (2) material that in said v-ti magnetite concentrate powder, adds water and sticker and obtain mixing; (3) use pelletizer that said material is made ball.
Preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roller speed of high-pressure roller mill is 10～20r/min.
Further preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roller speed of high-pressure roller mill is 14～18r/min.
Preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roll-in of high-pressure roller mill is 9～18MPa.
Further preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roll-in of high-pressure roller mill is 11～15MPa.
Usually, said v-ti magnetite concentrate balling property index is lower than 0.3.
Usually, said v-ti magnetite concentrate is Baima concentrate and at least a in the concentrate thickly.
Usually, said v-ti magnetite concentrate is Baima concentrate and the mixture of concentrate thickly, and blending ratio by weight is 1: 3 to 3: 1.
Usually, in the fine ore behind the measuring roll mill particle grade less than 200 purpose granule contents; When the v-ti magnetite concentrate powder behind the roller mill less than the granule content of 200 order grades during less than 70 weight %, 15～100 weight % of the fine ore behind the said roller mill are returned high-pressure roller mill continue the roller mill.
Preferably, use high-pressure roller mill to carry out going into abrasive material moisture when the roller mill is handled to said v-ti magnetite concentrate and be 6.5-8.0 weight %.
Usually, said sticker is a wilkinite.
Preferably, said bentonitic addition is 1.5～2 weight %.
With respect to prior art; Advantage of the present invention is: adopt high-pressure roller mill that v-ti magnetite concentrate is carried out pre-treatment; Can guarantee at the same time that metallurgical performances such as shatter strength of green pellet, compression strength of green pellet, cracking temperature of green pellet, dry ball ultimate compression strength, roasting ball ultimate compression strength satisfy under the prerequisite of production needs basically; Improved the balling ratio of v-ti magnetite concentrate, reduced the wilkinite addition, improved and gone into stove iron grade.
Description of drawings
Fig. 1 is the schema of v-ti magnetite concentrate pellet formation method according to the invention.
Embodiment
The quality of pelletizing balling property characterizes with balling-up sex index K.Press the size of material balling-up sex index K, can the fine grinding material be made the ball performance and roughly fall into 5 types:
The no balling-up property in K＜0.2
The weak balling-up property of K=0.2-0.35
The medium balling-up property of K=0.35-0.60
The good balling-up property of K=0.60-0.80
The excellent balling-up property in K＞0.80
Balling-up sex index K value is by computes:
The v-ti magnetite concentrate balling property index that v-ti magnetite concentrate pellet formation method of the present invention is suitable for is lower than 0.3, belongs to no balling-up property or weak balling-up property.
The pellet formation method of v-ti magnetite concentrate of the present invention may further comprise the steps:
(1) use high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, to obtain the v-ti magnetite concentrate powder;
(2) material that in said v-ti magnetite concentrate powder, adds water and sticker and obtain mixing;
(3) use pelletizer that said material is made ball.
In the pellet formation method of v-ti magnetite concentrate of the present invention, used a kind of pretreatment mode of new raising v-ti magnetite concentrate balling property: the high pressure roller mill grinding process.With use ball mill in the prior art v-ti magnetite concentrate is moistened mill and compare, high pressure roller mill grinding process of the present invention has the advantage that noise is low, energy consumption is little.
Because v-ti magnetite concentrate coarse size, specific surface area are little, the roller mill parameter of the present invention when experiment has been confirmed to use high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill repeatedly.
Preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roller speed of high-pressure roller mill is 10～20r/min.
Further preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roller speed of high-pressure roller mill is 14～18r/min.
Preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roll-in of high-pressure roller mill is 9～18MPa.
Further preferably, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roll-in of high-pressure roller mill is 11～15MPa.
Generally, v-ti magnetite concentrate balling property index is lower than 0.3.
At the more rich v-ti magnetite concentrate of China's reserves is Baima concentrate and concentrate thickly, so v-ti magnetite concentrate of the present invention can be Baima concentrate and at least a in the concentrate thickly.
Certainly; V-ti magnetite concentrate of the present invention can also be Baima concentrate and the mixture of concentrate thickly; On-the-spot in the v-ti magnetite concentrate pellet formation, the proportioning of above-mentioned two kinds of concentrate is: Baima concentrate is 1: 3 to 3: 1 with concentrate blending ratio by weight thickly.
Preferably, the pellet formation method of v-ti magnetite concentrate of the present invention can also comprise: the particle grade is less than 200 purpose granule contents in the fine ore behind the measuring roll mill; When the v-ti magnetite concentrate powder behind the roller mill less than the granule content of 200 order grades during less than 70 weight %, 15～100 weight % of the fine ore behind the said roller mill are returned high-pressure roller mill continue the roller mill.
Usually, the method that detects the use of concentrate grade is with standard sieve fine ore to be carried out wet sieving, surveys its grade less than 200 purpose granule contents.The v-ti magnetite concentrate that uses in embodiments of the present invention is by Baima concentrate and two kinds in concentrate thickly, and wherein, said Baima concentrate grade is 58.60 weight % less than 200 purpose granule contents, and specific surface area is 781cm
2/ g, said thickly concentrate grade is 68.05 weight % less than 200 purpose granule contents, specific surface area is 1297cm
2/ g.
When using high pressure roller mill that v-ti magnetite concentrate is carried out pre-treatment, going into abrasive material moisture is 6.5-8.0 weight %.When going into abrasive material moisture above 8.0 weight %, can cause the high-pressure roller mill roll surface wet and slippery, it is serious to handle the v-ti magnetite concentrate powder sizing that obtains, material cake caking.The v-ti magnetite concentrate granularity that then can cause when abrasive material moisture is lower than 6.5 weight % through after the high pressure roller mill processing is thicker when going into.
The sticker that uses when generally, the v-ti magnetite concentrate after high pressure roller mill is handled is made ball is wilkinite.
Because the v-ti magnetite concentrate powder specific surface area after high pressure roller mill is handled is bigger; Can adhere to each other between the particle; Therefore required wilkinite addition reduces when making ball, and preferably bentonitic addition is 1.5～2% of a said v-ti magnetite concentrate powder gross weight, because the wilkinite addition reduces; The impurity such as silicate of bringing the v-ti magnetite concentrate pelletizing into also reduce, so improved the v-ti magnetite concentrate pelletizing go into stove iron grade.
Embodiment 1
Φ 420 * 100mm type the high-pressure roller mill that uses Luoyang CITIC Group to produce carries out high pressure roller mill Baima concentrate is carried out the roller mill, and selected parameter is during the roller mill: roller speed 14r/min, and roll-in 13MPa goes into abrasive material moisture 8 weight %; Record after roller mill finishes that the particle grade is 76.9 weight % less than 200 order granule contents in the fine ore of Baima, the specific surface area of said fine ore is 1668cm
2/ g adds the wilkinite of water and 1.8 weight % and mixes in said fine ore.Use diameter to make ball as 1800mm, the rotating speed v-ti magnetite concentrate powder after as the balling disc roller-crushing mill of 15r/min.Make the preceding mother bulb 400g (staying fully in advance) that in disk, adds 3～5mm in advance of ball; Start disk, pick up counting during from blanking, even acceleration feed, moisturizing; Adding water, reinforced total time is 8 minutes; Make ball material, water for every group and add continued detections of taking a sample of stopping quotation on the exchange again in 2 minutes of rolling, making the green-ball per-cent of getting in 6～16mm grade scope behind the chou bundle is balling ratio, and recording balling ratio at this moment is 88%.Record through experiment, metallurgical performances such as the shatter strength of green pellet of green-ball, compression strength of green pellet, cracking temperature of green pellet, dry ball ultimate compression strength, roasting ball ultimate compression strength are as shown in table 1 at this moment.
Embodiment 2
Use the embodiment 1 described ball method of making, different is: selected parameter is roller speed 18r/min during the roller mill, and roll-in 11MPa goes into abrasive material moisture 6.5 weight %; Record after roller mill finishes that the particle grade is 74.3 weight % less than 200 order granule contents in the fine ore of Baima, the specific surface area of said fine ore is 1430cm
2/ g adds the wilkinite of water and 1.8 weight % and mixes in said fine ore, balling ratio is 85% when making ball.
Embodiment 3
Use the embodiment 1 described ball method of making, raw material is Baima concentrate, and different is: selected parameter is roller speed 16r/min during the roller mill, and roll-in 12MPa goes into abrasive material moisture 7.3 weight %; Record after roller mill finishes that the particle grade is 75.2 weight % less than 200 order granule contents in the fine ore of Baima, the specific surface area of said fine ore is 1530cm
2/ g adds the wilkinite of water and 1.8 weight % and mixes in Baima fine ore that obtains, balling ratio 86% when making ball.
Embodiment 4
Use the embodiment 1 described ball method of making, different is: selected parameter is roller speed 10r/min, roll-in 9MPa during the roller mill; Record after roller mill finishes that the particle grade is 68.21 weight % less than 200 order granule contents in the fine ore of Baima, this moment, the specific surface area of Baima fine ore was long-pending 1154cm
2/ g, balling ratio 80% when making ball.
Embodiment 5
Use the embodiment 1 described ball method of making, different is: selected parameter is roller speed 20r/min, roll-in 18MPa during the roller mill; Record after roller mill finishes that the particle grade is 69.4 weight % less than 200 order granule contents in the concentrate part of Baima, this moment, the specific surface area of Baima fine ore was 1158cm
2/ g, balling ratio 80% when making ball.
Embodiment 6
Use the embodiment 1 described ball method of making; Different is: raw material is a cryptographically concentrate of Baima concentrate; After Baima concentrate and concentrate thickly carried out proportioning in 1: 3 ratio and mix; Get into high-pressure roller mill and carry out the roller mill, record after the roller mill finishes that grade is 74 weight % less than 200 purpose granule contents in the collective concentrate powder that obtains, this moment, the specific surface area of fine ore was 1450cm
2/ g adds water and mixes with addition of the wilkinite of 1.5 weight % in said fine ore, balling ratio 86% when making ball.
Embodiment 7
Use the embodiment 1 described ball method of making; Different is: raw material is a cryptographically concentrate of Baima concentrate; With Baima concentrate and concentrate thickly is after 1: 1 ratio is carried out proportioning and mixed by weight; Get into high-pressure roller mill and carry out the roller mill, record after the roller mill finishes that grade is 75 weight % less than 200 purpose granule contents in the collective concentrate powder that obtains, the fine ore specific surface area 1635cm that obtain this moment
2/ g adds water and mixes with addition of the wilkinite of 1.5 weight % in said fine ore, balling ratio 88% when making ball.
Embodiment 8
Use the embodiment 1 described ball method of making; Different is: raw material is a cryptographically concentrate of Baima concentrate; With Baima concentrate and concentrate thickly is after 3: 1 ratio is carried out proportioning and mixed by weight; Get into high-pressure roller mill and carry out the roller mill, record after the roller mill finishes that grade is 72 weight % less than 200 purpose granule contents in the collective concentrate powder that obtains, the fine ore specific surface area 1400cm that obtain this moment
2/ g adds water and mixes with addition of the wilkinite of 1.7 weight % in said fine ore, balling ratio 83% when making ball.
Experimental example 1-8
Respectively the green-ball that obtains among the embodiment 1-8 is carried out preheating, preheating temperature is 950 ℃, warm up time 15min; Carry out roasting after the preheating, maturing temperature is 1250 ℃, time 15min.The ultimate compression strength that obtains the roasting ball is as shown in table 2.
Table 1
Table 2
| Experimental example 1 | Experimental example 2 | Experimental example 3 | Experimental example 4 | Experimental example 5 | Experimental example 6 | Experimental example 7 | Experimental example 8 | |
| Ultimate compression strength (N/) | ?2790 | ?2530 | ?2673 | ?2102 | ?2139 | ?2680 | ?2845 | ?2351 |
Claims (12)
1. the pellet formation method of a v-ti magnetite concentrate is characterized in that, this method may further comprise the steps:
(1) use high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, to obtain the v-ti magnetite concentrate powder;
(2) material that in said v-ti magnetite concentrate powder, adds water and sticker and obtain mixing;
(3) use pelletizer that said material is made ball.
2. the pellet formation method of v-ti magnetite concentrate according to claim 1, wherein, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roller speed of high-pressure roller mill is 10～20r/min.
3. the pellet formation method of v-ti magnetite concentrate according to claim 2, wherein, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roller speed of high-pressure roller mill is 14～18r/min.
4. the pellet formation method of v-ti magnetite concentrate according to claim 1, wherein, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roll-in of high-pressure roller mill is 9～18MPa.
5. the pellet formation method of v-ti magnetite concentrate according to claim 4, wherein, when using high-pressure roller mill that v-ti magnetite concentrate is carried out the roller mill, the roll-in of high-pressure roller mill is 11～15MPa.
6. the pellet formation method of v-ti magnetite concentrate according to claim 1, wherein, said v-ti magnetite concentrate balling property index is lower than 0.3.
7. the pellet formation method of v-ti magnetite concentrate according to claim 6, wherein, said v-ti magnetite concentrate is Baima concentrate and at least a in the concentrate thickly.
8. the pellet formation method of v-ti magnetite concentrate according to claim 7, wherein, said v-ti magnetite concentrate is Baima concentrate and the mixture of concentrate thickly, blending ratio by weight is 1: 3 to 3: 1.
9. the pellet formation method of v-ti magnetite concentrate according to claim 1, wherein, this method also comprises: the particle grade is less than 200 purpose granule contents in the fine ore behind the measuring roll mill; When the v-ti magnetite concentrate powder behind the roller mill, returns 15～100% of the fine ore behind the said roller mill to high-pressure roller mill and continues the roller mill during less than 70 weight % less than the granule content of 200 order grades.
10. the pellet formation method of v-ti magnetite concentrate according to claim 1, wherein, using high-pressure roller mill to carry out going into abrasive material moisture when the roller mill is handled to said v-ti magnetite concentrate is 6.5～8.0 weight %.
11. the pellet formation method of v-ti magnetite concentrate according to claim 1, wherein, said sticker is a wilkinite.
12. the pellet formation method of v-ti magnetite concentrate according to claim 11, wherein, said bentonitic addition is 1.5～2 weight %.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103266223A (en) * | 2013-05-24 | 2013-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace maintenance vanadium-titanium pellet for normal blast furnace and production method thereof |
| CN103898318A (en) * | 2012-12-31 | 2014-07-02 | 攀钢集团研究院有限公司 | Pelletizing method, pellet ore fresh pellet and pellet ore |
| CN103924069A (en) * | 2014-04-15 | 2014-07-16 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
| 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 |
| CN107937716A (en) * | 2017-11-02 | 2018-04-20 | 安阳钢铁股份有限公司 | A kind of iron ore pellets raw materials for production preparation method for being conducive to efficient pelletizing |
| CN108374084A (en) * | 2018-03-20 | 2018-08-07 | 佛山科学技术学院 | Production process of high-strength carbon-containing titanium concentrate pellets |
| CN108520164A (en) * | 2018-03-16 | 2018-09-11 | 东北大学 | A kind of microwave heating improves the analysis method of vanadium titano-magnetite grindability |
| CN110042228A (en) * | 2019-02-26 | 2019-07-23 | 攀钢集团攀枝花钢钒有限公司 | It is sintered v-ti magnetite concentrate Intensified support method |
| CN110438335A (en) * | 2018-05-02 | 2019-11-12 | 中南大学 | It is a kind of for the compound iron ore pellet containing charcoal of microwave reduction and its preparation and application |
| CN111500857A (en) * | 2020-04-15 | 2020-08-07 | 山西太钢不锈钢股份有限公司 | Method for improving pelletizing rate of green pellets of alkaline pellets |
| CN112553388A (en) * | 2020-11-23 | 2021-03-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace charge of high-grade vanadium titano-magnetite and smelting method |
| CN115125390A (en) * | 2022-07-12 | 2022-09-30 | 马鞍山钢铁股份有限公司 | Automatic disk pelletizing device and method for metallurgical laboratory |
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| CN103898318B (en) * | 2012-12-31 | 2016-12-28 | 攀钢集团研究院有限公司 | A kind of method of pelletizing and a kind of pellet raw ball and pellet |
| CN103266223A (en) * | 2013-05-24 | 2013-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace maintenance vanadium-titanium pellet for normal blast furnace and production method thereof |
| CN103924069A (en) * | 2014-04-15 | 2014-07-16 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
| CN103924069B (en) * | 2014-04-15 | 2017-02-22 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
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| CN108520164A (en) * | 2018-03-16 | 2018-09-11 | 东北大学 | A kind of microwave heating improves the analysis method of vanadium titano-magnetite grindability |
| CN108520164B (en) * | 2018-03-16 | 2020-07-24 | 东北大学 | Analysis method for improving grindability of vanadium titano-magnetite through microwave heating |
| CN108374084A (en) * | 2018-03-20 | 2018-08-07 | 佛山科学技术学院 | Production process of high-strength carbon-containing titanium concentrate pellets |
| CN110438335A (en) * | 2018-05-02 | 2019-11-12 | 中南大学 | It is a kind of for the compound iron ore pellet containing charcoal of microwave reduction and its preparation and application |
| CN110042228A (en) * | 2019-02-26 | 2019-07-23 | 攀钢集团攀枝花钢钒有限公司 | It is sintered v-ti magnetite concentrate Intensified support method |
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