CN104846191A - Vanadium-titanium sinter and preparation method thereof - Google Patents
Vanadium-titanium sinter and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of blast furnace smelting and discloses vanadium-titanium sinter and its preparation method. The method comprises the following steps: mixing sintering raw material compositions with water to prepare a sinter mixture, and distributing, pressing and sintering the sinter mixture. With the total weight of the sintering raw material compositions as the reference, content of sea sand vanadium-titanium-iron concentrate is 65-70 wt%, and content of low-grade common iron ore is 10-15 wt%. By the above method, high proportion of sea sand vanadium-titanium-iron concentrate can be sintered; finished product ratio of vanadium-titanium sinter can reach more than 74%; comprehensive tumbler strength (ISO) reaches more than 73%; TFe grade is greater than or equal to 50%; and productivity of a sintering machine reaches more than 1.15t/(m<2>.h). The vanadium-titanium sinter has high mechanical strength and can be used for blast furnace smelting.
Description
Technical field
The present invention relates to a kind of preparation method of vanadium titanium agglomerate, and the vanadium titanium agglomerate prepared by the method.
Background technology
After blast-furnace smelting agglomerate is prepared by non-extra large sand all-sefstromite concentrate and the common iron ore concentrate of different ratios at present the common fine iron breeze of 30% (the non-extra large sand all-sefstromite concentrate of such as 70% with addition of) or all iron ore concentrate sinteredly to make with common, such agglomerate is comparatively simple due to sintering process, applies very wide.But day by day reduce due to common iron ore deposit, cost continues surging, and the raw materials cost of agglomerate is relied on market to be increased.
The sea sand sefstromite concentrate reserves of Indonesia and surrounding area are very abundant, cheap and steady sources, but different from the vanadium titano-magnetite of China Panxi Diqu, because extra large sand sefstromite concentrate has TFe content high (TFe>58%), TiO
2high (the TiO of content
2>12%), low silicon (SiO
2account for about 0.7%), the singularity of its balling-up and water-absorbent difference, therefore not easy-sintering, and the uhligite that generating property is crisp in sintering process, sintered iron hydrochlorate low temperature bonding mutually less and its form is different from ordinary sinter ore deposit calcium ferrite, cause that sinter strength is poor, yield rate is low, constrain the raising of smelting strength of blast furnace.
Therefore in the preparation of current vanadium titanium agglomerate, sea sand sefstromite concentrate also just as improve Partial Elements in common iron ore (as, vanadium) iron content auxiliary material use, because its relative usage is few compared with common iron ore, make the raw materials cost of agglomerate still very high.
For promoting comprehensive utilization, the strategic control of resource and reducing costs, guarantee the practicality of producing simultaneously, need the sintering method of the extra large sand sefstromite concentrate that (dry material proportion >=60%) under a kind of high mixture ratio condition is provided badly.
Summary of the invention
The object of the invention is to the problems referred to above solving prior art, thus a kind of preparation method of vanadium titanium agglomerate is provided, and the vanadium titanium agglomerate prepared by the method.
The invention provides a kind of preparation method of vanadium titanium agglomerate, the method comprises: mixed with water by raw materials for sintering composition, make sinter mixture, then described sinter mixture is carried out cloth, binder sintering; Wherein, described raw materials for sintering composition contains extra large sand sefstromite concentrate, low-grade common iron ore concentrate, flux, fuel and optional slag; In described extra large sand sefstromite concentrate, the content of TFe is more than 58 % by weight, TiO
2content be 12-14 % by weight, SiO
2content below 1.0 % by weight; In described low-grade common iron ore, the content of TFe is 47-49 % by weight, TiO
2content below 1.0 % by weight, SiO
2content be 12-17 % by weight; With the gross weight of described raw materials for sintering composition for benchmark, the content of described extra large sand sefstromite concentrate is 65-70 % by weight, is preferably 65-68 % by weight; The content of described low-grade common iron ore is 10-15 % by weight, is preferably 12-15 % by weight.
Method of the present invention can realize the sintering of the extra large sand sefstromite concentrate of high mixture ratio, the method can make the yield rate of vanadium titanium agglomerate reach more than 74%, comprehensive barrate strength (ISO) is more than 73%, and TFe grade>=50%, productivity of sintering machine reaches 1.15t/ (m
2h) more than.This vanadium titanium agglomerate has higher physical strength, can be used in blast-furnace smelting.In addition, in agglomerate, the consumption of common iron ore is less, and therefore method of the present invention also reduces the raw materials cost of vanadium titanium agglomerate.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of preparation method of vanadium titanium agglomerate, the method comprises: mixed with water by raw materials for sintering composition, make sinter mixture, then described sinter mixture is carried out cloth, binder sintering; Wherein, described raw materials for sintering composition contains extra large sand sefstromite concentrate, low-grade common iron ore concentrate, flux, fuel and optional slag; In described extra large sand sefstromite concentrate, the content of TFe is more than 58 % by weight, TiO
2content be 12-14 % by weight, SiO
2content below 1.0 % by weight; In described low-grade common iron ore, the content of TFe is 47-49 % by weight, TiO
2content below 1.0 % by weight, SiO
2content be 12-17 % by weight; With the gross weight of described raw materials for sintering composition for benchmark, the content of described extra large sand sefstromite concentrate is 65-70 % by weight, is preferably 65-68 % by weight; The content of described low-grade common iron ore is 10-15 % by weight, is preferably 12-15 % by weight.
In the present invention, described extra large sand sefstromite concentrate can be derived from the Indonesia of rich content and the extra large placer of periphery thereof, normally, except above component, other chemical constitutions of described extra large sand sefstromite concentrate can comprise: the Al of CaO, 2-3.4 % by weight of 0.5-1 % by weight
2o
3, the MgO of 1-2.5 % by weight, the P of less than 0.1 % by weight and less than 0.3 % by weight S, and the content of FeO is 20-32 % by weight.
In the preparation process in accordance with the present invention, the granularity of described extra large sand sefstromite concentrate is not particularly limited, can with reference to the existing powder particle size preparing agglomerate.What in preferred described extra large sand sefstromite concentrate, granularity was less than 0.074mm accounts for more than 70 % by weight, described extra large sand v-ti magnetite concentrate can be made like this to burn more fully, make vanadium titanium agglomerate have higher physical strength.
In the present invention, described common low-grade iron ore concentrate is not containing vanadium and titanium elements or only contains the vanadium of trace, the iron ore concentrate of titanium elements.In described raw materials for sintering composition, the granularity of preferred described common low-grade iron ore concentrate is less than 5mm.In the present invention, if no special instructions, described granularity refers to the granularity that the common low-grade iron ore concentrate of this group of 100 % by weight divides.Such as " granularity of common low-grade iron ore concentrate is lower than 5mm " refers to that the granularity of the common low-grade iron ore concentrate of 100 % by weight is less than 5mm.
In the present invention, the slag that described slag can produce in smelting process for blast furnace burden.Described slag can provide the TFe required for vanadium titanium agglomerate on the one hand, also can regulate the basicity of agglomerate on the other hand together with described flux.Normally, the chemical constitution of described slag can comprise: the SiO of TFe, 6-8 % by weight of 22-27 % by weight
2with more than 35 % by weight CaO.
Preparation in accordance with the present invention, the consumption of described slag can regulate according to the kind of flux and consumption.Usually, with the gross weight of described raw materials for sintering composition for benchmark, the content of described flux is 8-15 % by weight, and the content of described slag is 0-4 % by weight.
In order to improve the intensity of vanadium titanium agglomerate, yield rate reduce raw materials for sintering cost further, under preferable case, with the gross weight of described raw materials for sintering composition for benchmark, the content of described flux is 10-14 % by weight, and the content of described slag is 1-3 % by weight.
In the present invention, the selection of described flux can be carried out with reference to prior art.From the angle reduced costs, preferably, described flux contains unslaked lime and Wingdale.
The main component of described unslaked lime is CaO, and before the described sinter mixture of preparation, (main component is Ca (OH) with water, described quicklime slaking can be become slaked lime
2), to increase balling-up and the size composition of described sinter mixture, and improve the intensity after sinter mixture balling-up.Normally, in described unslaked lime, the content of CaO can be 80-88 % by weight.When digesting described unslaked lime, the mass ratio of described unslaked lime and water consumption can be 1.8-2.2:1.
The main component of described Wingdale is CaCO
3, can decompose in sintering process and release CO
2, play loose bed of material effect, greatly can improve the ventilation property of the bed of material, and can combustionvelocity be improved, ensure the yield rate of agglomerate.Normally, with oxide basis, in described Wingdale, the content of CaO can be 50-53 % by weight.In described raw materials for sintering composition, the granularity of preferred described Wingdale is less than 3mm.
A preferred embodiment of the invention, with the gross weight of described raw materials for sintering composition for benchmark, the content of unslaked lime is 6-8 % by weight, and the content of Wingdale is 5-6 % by weight.
According to the present invention, the consumption of described fuel can be 4-5 % by weight, is preferably 4.6-5 % by weight.Described fuel can be selected from the conventional various fuel of sintering process, such as, can be coke powder and/or coal.From the angle improving vanadium titanium agglomerate sintering strength further, preferred described fuel is coke powder.Ash oontent in described coke powder can be 10-15 % by weight, and the content of fixed carbon can be 75-85 % by weight.Preferably, in described raw materials for sintering composition, the granularity of described coke powder is less than 5mm.
It is well known in the art that, in order to obtain agglomerate finished product, after sintering terminates, the sinter cake obtained is needed to carry out fragmentation, then sieve, the part vanadium titanium agglomerate sieved out can circulate as preparing the grate-layer material of described vanadium titanium agglomerate or using as the batching of sinter mixture according to the difference of granularity.The detailed process of described fragmentation, screening is known in the art, is not repeating at this.
A preferred embodiment of the invention, being prepared in of described sinter mixture is carried out under returning mine and existing, that is, return mine described in be jointly mixed with described sinter mixture with described raw materials for sintering composition, in the case, the granularity of returning mine described in usually can at below 6.3mm.Described return mine add the ventilation property that can improve sinter mixture further, increase sintering amount of liquid phase, improve the intensity of agglomerate.
In the present invention, relative to the described raw materials for sintering composition of 100 weight parts, described in the consumption of returning mine can be 20-30 weight part.
Preparation in accordance with the present invention, the process preparing described sinter mixture can comprise: one dark even two mixed granulation.Usually, a dark even method comprises described raw materials for sintering composition and water mixing 2-4min, and relative to the described raw materials for sintering composition of 100 weight parts, water consumption when drifting along or through even can be 5.8-6.3 weight part; Two mixed methods of granulating comprise dark even products therefrom and a water mixing 2-4min, and relative to the described raw materials for sintering composition of 100 weight parts, water consumption during two mixed granulations can be 1.4-1.6 weight part.
According to the present invention, preferably described one dark even two mixed total time of granulating was 6-8min.By two mixed granulate after, what in described sinter mixture, granularity was greater than 3mm can account for more than 60 % by weight.
In the present invention, the consumption of preferably water makes the content of moisture in described sinter mixture be 7.4-7.8 % by weight.
According to the present invention, described cloth carries out on the chassis of sinter machine.The cloth of described sinter mixture is preferably carried out under the existence of grate-layer material, that is, before the described sinter mixture of paving, first spreads described grate-layer material, can load of dust remove be reduced like this, reduce or eliminate fire grate sizing, improve the ventilation property of the bed of material.Described grate-layer material can be derived from returning mine of described vanadium titanium agglomerate or be selected from lump ore, the granularity of described grate-layer material can be 10-16mm, and the thickness of grate-layer material can be 18-22mm.
Preferably, described cloth makes the height of the bed of material be 600-700mm, and the Altitude control of the described bed of material, in above-mentioned scope, can control sintering velocity, and the effect of bed of material auto accumulation heat can be utilized to reduce mixed carbon comtent.In the present invention, if there is grate-layer material, the height of the described bed of material refers to the total height of grate-layer material and described sinter mixture.
According to the present invention, carry out binder the bulk density of raw materials for sintering can be made to increase after cloth, raw materials for sintering particle contacts is tight, effectively can reduce sintering velocity, extends high temperature hold time, makes crystallizable mineral more abundant.Preferred described binder makes the bed of material depress 20-50mm.
Preparation in accordance with the present invention, described sintering is preferably lighted a fire down draft sintering.The temperature of this igniting can be selected according to the temperature of fusion of sintering resultant, and the heat that ignition time can complete needed for scorification according to top layer charge level is selected.In order to make vertical sintering speed in suitable scope, preferably, the ignition temperature 1100-1150 DEG C of described igniting down draft sintering, ignition time is 2-2.5min, and igniting negative pressure is 5.5-6kPa, and sintering negative pressure is 11.5-12.5kPa, and exhausting flow is 5-15m
3/ min.Vertical sintering speed can control at 18-20mm/min by this sintering condition of the present invention.
In the present invention, the time of described sintering can be selected according to the spent air temperture in air draft pipe.Normally, when the spent air temperture that air draft pipe is total rise to the highest drop to about 20 DEG C again time, described sintering can be terminated.
The content of FeO in agglomerate can be controlled at 7-10 % by weight according to aforesaid method of the present invention.
According to a second aspect of the invention, the invention provides the vanadium titanium agglomerate prepared by above method.Sintering basicity (the CaO/SiO of vanadium titanium agglomerate of the present invention
2) be generally 2.2-2.5, TFe grade >50%.This vanadium titanium agglomerate has higher yield rate and physical strength, can be used in blast-furnace smelting.
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited in following embodiment.
In following examples and comparative example, extra large sand v-ti magnetite concentrate (TFe:58.22 % by weight, FeO:30.07 % by weight, TiO
2: 12.64 % by weight, SiO
2: 0.73 % by weight) from Indonesia, granularity accounts for 70 % by weight lower than 0.074mm;
Low-grade common iron ore concentrate (TFe:47.52 % by weight, SiO
2: 12.50 % by weight, Al
2o
3: 4.18 % by weight), granularity is less than 5mm;
In unslaked lime, CaO content is 88 % by weight, is first used further to prepare sinter mixture after 20 seconds by quicklime slaking with water, and the mass ratio of unslaked lime and digestion water is 2:1;
In Wingdale, CaO content is 52 % by weight, and granularity is less than 3mm;
The main composition of slag comprises: TFe:25 % by weight, SiO
2: 6-8 % by weight, CaO content 32 % by weight, Al
2o
3: less than 4 % by weight;
In coke powder, fixed carbon content is 84 % by weight, and ash content is containing being 13 % by weight, and granularity is less than 5mm;
The main composition of returning mine comprises: TFe:50 % by weight, SiO
2: 50-5.2 % by weight, CaO:11.5-12 % by weight, granularity is less than 5mm;
The composition of grate-layer material comprises: TFe:50 % by weight, SiO
2: 50-5.2 % by weight, CaO:11.5-12 % by weight, be finished product agglomerate, granularity is 10-16mm, and the height of grate-layer material is 20mm.
The testing method of barrate strength is: the tumbler index of agglomerate measures according to GB GB8209-87 " agglomerate and pellet barrate strength measuring method ".
The testing method of yield rate is: namely carry out screening to the agglomerate after burning till and weigh, using the yield rate of the percentage value of the weight and agglomerate gross weight that are wherein greater than 6.3mm part as this agglomerate.
Embodiment 1-5
Embodiment 1-5 is for illustration of vanadium titanium agglomerate of the present invention and preparation method thereof.
By extra large sand sefstromite concentrate, low-grade common iron ore concentrate, unslaked lime, Wingdale, slag, coke powder, return mine and to prepare burden according to the ratio shown in table 1, then add blending bunker in mixing machine, mix 6-8min (comprising one dark even two mixed ball processed), obtain sinter mixture, what the granularity of sinter mixture was greater than 3mm accounts for more than 65 % by weight.
First grate-layer material on sintered cup (diameter is 300mm, is highly 800mm) middle berth, then carry out cloth, binder by above-mentioned sinter mixture loading sintered cup, binder makes the bed of material depress 30mm.Carry out igniting down draft sintering to sintered cup subsequently, be 1100 DEG C-1150 DEG C by controlling ignition temperature, ignition time is 2.0-2.5min, and igniting negative pressure is 5.5-6.0kPa, and sintering negative pressure is 11.5-12.5kPa, and exhausting flow is 5-15m
3/ min controls vertical sintering speed.Wherein, the water content of sinter mixture, cloth height and vertical sintering speed are as shown in table 2.
When the spent air temperture of sintered cup lower end air draft pipe rise to the highest drop to 20 DEG C again time, sintering process terminates.Sinter cake poured out and carries out fragmentation, sieving according to >40mm, 40-25mm, 25-16mm, 16-10mm, 10-6.3mm and <6.3mm, obtaining vanadium titanium agglomerate.The basicity of vanadium titanium agglomerate, primary chemical composition and character as shown in table 3.
Comparative example 1-2
Adopt the method identical with embodiment 1-5 to prepare vanadium titanium agglomerate, difference is, in raw materials for sintering composition, the consumption of each component is different from embodiment 1-5, specifically as shown in table 1, thus obtained vanadium titanium agglomerate.The basicity of vanadium titanium agglomerate, primary chemical composition and character as shown in table 3.
Table 1*
*: the consumption of raw material is all in " weight part ".
Table 2
Table 3
*: basicity refers to CaO and SiO
2mass ratio.
Compared by embodiment 1-5 and comparative example 1-2, associative list 1 and table 3 can be found out, vanadium titanium agglomerate prepared by method of the present invention has higher yield rate and barrate strength, is applicable to blast-furnace smelting.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. a preparation method for vanadium titanium agglomerate, the method comprises: mixed with water by raw materials for sintering composition, make sinter mixture, then described sinter mixture is carried out cloth, binder sintering;
Wherein, described raw materials for sintering composition contains extra large sand sefstromite concentrate, low-grade common iron ore concentrate, flux, fuel and optional slag; In described extra large sand sefstromite concentrate, the content of TFe is more than 58 % by weight, TiO
2content be 12-14 % by weight, SiO
2content below 1.0 % by weight; In described low-grade common iron ore, the content of TFe is 47-49 % by weight, TiO
2content below 1.0 % by weight, SiO
2content be 12-17 % by weight;
With the gross weight of described raw materials for sintering composition for benchmark, the content of described extra large sand sefstromite concentrate is 65-70 % by weight, is preferably 65-68 % by weight; The content of described low-grade common iron ore is 10-15 % by weight, is preferably 12-15 % by weight.
2. method according to claim 1, wherein, the chemical constitution of described slag comprises: the SiO of TFe, 6-8 % by weight of 22-27 % by weight
2with more than 35 % by weight CaO; With the gross weight of described raw materials for sintering composition for benchmark, the content of described flux is 8-15 % by weight, and the content of described slag is 0-4 % by weight, and the content of described fuel is 4-5 % by weight.
3. method according to claim 2, wherein, with the gross weight of described raw materials for sintering composition for benchmark, the content of described flux is 10-14 % by weight, and the content of described slag is 1-3 % by weight, and the content of described fuel is 4.6-5 % by weight.
4. according to the method in claim 1-3 described in any one, wherein, described fuel is coke powder; Described flux contains unslaked lime and Wingdale, and with the gross weight of described raw materials for sintering composition for benchmark, the content of unslaked lime is 6-8 % by weight, and the content of Wingdale is 5-6 % by weight.
5. method according to claim 4, wherein, the granularity of described coke powder is less than 5mm, and the granularity of Wingdale is less than 3mm, and the granularity of described common low-grade iron ore concentrate is less than 5mm, and in described extra large sand sefstromite concentrate, the granularity of more than 70 % by weight is less than 0.074mm.
6. method according to claim 1, wherein, the time of described mixing is 6-8min, and the water-content in described sinter mixture is 7.4-7.8 % by weight.
7. method according to claim 1, wherein, described cloth carries out under the existence of grate-layer material, and the granularity of described grate-layer material is 10-16mm, and the thickness of grate-layer material is 18-22mm.
8. the method according to claim 1 or 7, wherein, described cloth makes the height of the bed of material be 600-700mm.
9. method according to claim 1, wherein, described in be sintered to igniting down draft sintering, the ignition temperature 1100-1150 DEG C of described igniting down draft sintering, ignition time is 2-2.5min, and igniting negative pressure is 5.5-6kPa, sintering negative pressure is 11.5-12.5kPa, and exhausting flow is 5-15m
3/ min.
10. according to the method in claim 1-9 described in any one, wherein, being prepared in of described sinter mixture is carried out under returning mine and existing, relative to the described raw materials for sintering composition of 100 weight parts, described in the consumption of returning mine be 20-30 weight part.
The vanadium titanium agglomerate that in 11. claim 1-10 prepared by method described in any one.
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| CN105441668A (en) * | 2015-11-25 | 2016-03-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering method for sea sand vanadium-titanium-iron concentrate |
| CN105441669A (en) * | 2016-01-13 | 2016-03-30 | 山西太钢不锈钢股份有限公司 | Method of improving air permeability of fully refined powder sintered material layer |
| CN105969980A (en) * | 2016-07-26 | 2016-09-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering method for increasing finished product rate of vanadium-titanium sinter |
| CN107881325A (en) * | 2017-11-19 | 2018-04-06 | 东北大学 | A kind of method that low chromium type vanadium titano-magnetite prepares sintering deposit with addition of chromite |
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| CN113943860A (en) * | 2021-10-19 | 2022-01-18 | 攀钢集团研究院有限公司 | Reinforced granulating method for vanadium-titanium sintering mixture |
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