CN104878195A - Sintering raw material composition and vanadium-titanium sintered ore and preparation method thereof - Google Patents
Sintering raw material composition and vanadium-titanium sintered ore and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of vanadium-titanium magnetite sintering and discloses a sintering raw material composition and a vanadium-titanium sintered ore and a preparation method thereof. The sintering raw material composition contains vanadium-titanium magnetite concentrates, dolomite, limestone, active lime and fuel, wherein the vanadium-titanium magnetite concentrates is sea sand vanadium-titanium magnetite concentrates, and the sintering raw material composition further contains silica. The sintering raw material composition can achieve sintering of the whole sea sand vanadium-titanium magnetite concentrate, and the raw material cost of the sintered ore is reduced. In addition, by means of the preparation method, a silicate bonding phase in the sintered ore can be added, the liquid phase generation amount in the sintering process is effectively increased, and accordingly the strength of the vanadium-titanium sintered ore is improved.
Description
Technical field
The present invention relates to the technical field of vanadic-titanomagnetite sintering, particularly, relate to a kind of raw materials for sintering composition, prepared the method for vanadium titanium agglomerate by this raw materials for sintering composition, and the vanadium titanium agglomerate prepared by the method.
Background technology
China has abundant v-ti magnetite ore reserves, and especially Panxi Diqu contains a large amount of vanadium titano-magnetites.And also have a large amount of v-ti magnetite ore resources abroad, be mainly extra large sand vanadium titano-magnetite, the sea sand sefstromite concentrate reserves of special Indonesia and surrounding area are very abundant, cheap and steady sources
For sintering process, due to the SiO of extra large sand v-ti magnetite concentrate
2content is very low, TiO
2the feature that content is high, causes Binder Phase growing amount in sintering process little, and make the sintering of extra large sand v-ti magnetite concentrate more difficult, the intensity of agglomerate and yield rate are all lower, belongs to difficult and burns mineral.
Usually, in order to improve the intensity of v-ti magnetite concentrate agglomerate, the method that can adopt is with addition of the common iron ore of the high silicon of part and the basicity improving agglomerate.But leading to iron ore with addition of regular senior middle school's silicon suitably can increase SiO in agglomerate
2content, but due to regular senior middle school's silicon, to lead to the price of iron ore higher, the proportioning of extra large sand schreyerite in sintering can be caused to reduce, the sintering cost of vanadium titano-magnetite is increased.In addition, although the basicity improving agglomerate can increase the Binder Phase of calcium ferrite, also can increase the amount of uhligite simultaneously, can have a negative impact to the quality of agglomerate.
Summary of the invention
The object of the invention is to the above-mentioned technical problem solving prior art existence, thus a kind of raw materials for sintering composition is provided, prepared the method for vanadium titanium agglomerate by this raw materials for sintering composition, and the vanadium titanium agglomerate prepared by the method.
According to a first aspect of the invention, the invention provides a kind of raw materials for sintering composition, this raw materials for sintering composition contains v-ti magnetite concentrate, rhombspar, Wingdale, quickened lime and fuel, wherein, described v-ti magnetite concentrate is extra large sand v-ti magnetite concentrate, and described raw materials for sintering composition is also containing silica.
According to a second aspect of the invention, the invention provides a kind of preparation method of vanadium titanium agglomerate, the method comprises:
(1) the above raw materials for sintering composition is made compound;
(2) described compound is carried out cloth, binder and sintering.
According to a third aspect of the present invention, the invention provides the vanadium titanium agglomerate prepared by above method.
Raw materials for sintering composition provided by the invention can realize the sintering to complete extra large sand v-ti magnetite concentrate, reduces the raw materials cost of agglomerate; And method of the present invention can increase the Silicate Binding Phase in agglomerate, effectively improve the liquid phase growing amount of sintering process, thus improve the intensity 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.
According to a first aspect of the invention, the invention provides a kind of raw materials for sintering composition, this raw materials for sintering composition contains v-ti magnetite concentrate, rhombspar, Wingdale, quickened lime and fuel, wherein, described v-ti magnetite concentrate is extra large sand v-ti magnetite concentrate, and described raw materials for sintering composition is also containing silica.
According to the present invention, in order to improve the intensity of vanadium titanium agglomerate, improve the mobility of slag, containing rhombspar in described raw materials for sintering composition simultaneously.The main component of described rhombspar is CaCO
3and MgCO
3, in sintering process, obtain the light dolomite that main component is CaO and MgO.Normally, with oxide basis, in described rhombspar, the content of CaO can be the content of 25-35 % by weight, MgO can be 15-25 % by weight.
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.In the present invention, with oxide basis, in described Wingdale, the content of CaO can be 48-53 % by weight.
In the present invention, in order to ensure the balling-up of agglomerate, described raw materials for sintering composition is also containing quickened lime.Described quickened lime is also called high reaction lime or soft calcined lime, the lime that a kind of purity is high, have that volume density is little, void content is high (being generally more than 50%), crystallization is thin, intensity is large, specific surface area is large, sulphur content is little and the feature such as reversed stress is strong, therefore, be widely used in sintering process.With oxide basis, in described quickened lime, the content of CaO is preferably 75-80 % by weight.The activity degree of described quickened lime is preferably 250-400mL.In the present invention, when not doing contrary explanation, the term " activity degree " of use represents by the speed of response of lime and water usually, namely at normal atmospheric pressure, in 10min, 50g lime to be dissolved in 40 DEG C of thermostat(t)ed waters consume the milliliter number of the 4N HCl aqueous solution.
According to the present invention, described fuel can be selected from the conventional various fuel of sintering process, such as, can be coke powder and/or anthracite.From the angle improving vanadium titanium agglomerate sintering strength further, preferred described fuel is coke powder.
According to the present invention, described silica can be selected from high silica, and described high silica refers to main component SiO
2the silica of content more than 95 % by weight.The present inventor surprisingly finds under study for action, using described silica and rhombspar, Wingdale together with quickened lime as when sintering the flux of extra large sand v-ti magnetite concentrate, can avoid using the common iron ore of high silicon, realize the sintering of complete extra large sand vanadium titano-magnetite (not using other iron ores except extra large sand v-ti magnetite concentrate), and the yield rate of vanadium titanium agglomerate obtained by improving and mean particle size.
In the present invention, described extra large sand v-ti magnetite concentrate can be derived from the Indonesia of rich content and the extra large placer of periphery thereof.TiO in usual described extra large sand v-ti magnetite
2content be 5-13 % by weight, SiO
2content below 0.3 % by weight.
Preferably, other chemical constitutions of described extra large sand v-ti magnetite concentrate comprise: the Al of CaO, 2-3.4 % by weight of TFe, 0.3-1 % by weight of more than 56 % by weight
2o
3, 1-2.5 % by weight the V of MgO, 0.5-0.8 % by weight
2o
5, the P of less than the 0.1 % by weight and S of less than 0.3 % by weight, and the content of FeO is 20-30 % by weight.
In described raw materials for sintering composition, the granularity of preferred described extra large sand v-ti magnetite concentrate is not more than 1mm, and with the gross weight of described extra large sand v-ti magnetite concentrate for benchmark, granularity be below 200 orders account for more than 60 % 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 described raw materials for sintering composition, the content of described rhombspar, Wingdale, quickened lime, silica and fuel can be selected according to the concrete chemical constitution of described extra large sand v-ti magnetite concentrate and content.A preferred embodiment of the invention, with the gross weight of described raw materials for sintering composition for benchmark, the content of described extra large sand v-ti magnetite concentrate is 73-80 % by weight, the content of described rhombspar is 2-10 % by weight, the content of described Wingdale is 2-11 % by weight, the content of described quickened lime is 5-8 % by weight, and the content of described silica is 2-10 % by weight, the content 4.5-6 % by weight of described fuel.
More preferably, with the gross weight of described raw materials for sintering composition for benchmark, the content of described extra large sand v-ti magnetite concentrate is 74-79 % by weight, the content of described rhombspar is 3-6 % by weight, the content of described Wingdale is 4-10 % by weight, the content of described quickened lime is 5-7 % by weight, and the content of described silica is 3-5 % by weight, the content 4.5-5 % by weight of described fuel.
Preferably, the granularity of described rhombspar, Wingdale, quickened lime and silica is all not more than 3mm, and the granularity of described fuel is not more than 5mm.The described granularity mesh size of the screen cloth by sieving the material particles obtained represents.
According to a second aspect of the invention, the invention provides a kind of preparation method of vanadium titanium agglomerate, the method comprises:
(1) the above raw materials for sintering composition is made compound;
(2) described compound is carried out cloth, binder and sintering.
In step (1), the process preparing described mangcorn 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 7-8 weight part.
Usually, 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 7-8 weight part.After two mixed granulations, the median size of described compound can be 1-8mm.
Preferably, the consumption of water makes the content of moisture in described compound be 7.2-7.6 % by weight.
In order to improve the intensity of vanadium titanium agglomerate further, preferably, in the compound that step (1) is obtained, the content of fixed carbon is 2.7-3.1 % by weight, is more preferably 2.8-2.95 % by weight.In the present invention, " fixed carbon " refers to the residue after coke powder removing moisture, ash content and volatile matter.
Preparation in accordance with the present invention, the basicity of described compound can be 2.1-2.3, is preferably 2.12-2.3.
In step (2), the process of described cloth comprises: the height preferably controlling the bed of material is 630-670mm.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 order to improve above-mentioned effect further, the height of the described bed of material is more preferably 640-655mm.The binder carried out after cloth makes the bulk density of raw materials for sintering rise, and 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.
In step (2), preferably the ignition temperature of sintering controlled as 1000-1100 DEG C, the ignition time of sintering controls as 1-3min, can provide heat of more lighting a fire like this, improve the quality of upper layer agglomerate for sintering.
According to a third aspect of the present invention, the invention provides the vanadium titanium agglomerate prepared by above method.
The mean particle size of vanadium titanium agglomerate prepared by the vanadium titanium agglomerate adopting aforesaid method of the present invention to prepare can be 13-20mm.Described mean particle size refers to: the weighted mean of different grain size scope proportion.In described vanadium titanium agglomerate, the content of TFe can be 51-53 % by weight, SiO
2content can be 4.8-5.5 % by weight.
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, the composition of raw materials for sintering composition and the main composition of each composition as shown in table 1, before preparing vanadium titanium agglomerate, Wingdale, rhombspar, silica and quickened lime (activity degree is 250-300mL) are all broken into the powder of particle diameter at below 3mm, sea sand v-ti magnetite concentrate (being derived from Indonesia) be broken into the powder of particle diameter at below 1mm, and granularity be below 200 orders account for 60 % by weight.
Table 1
In following examples and comparative example, the barrate strength of the vanadium titanium agglomerate of preparation is the ISO barrate strength according to GB13242 definition, refers to get 7.5 kilograms of 40-10mm agglomerate in ISO drum unit (SQZG-4 type; Hebi City metallurgical machinery equipment company limited) in rotate after 200 turns, be greater than the per-cent that 6.3mm grade agglomerate accounts for whole agglomerate weight in agglomerate.
The testing method of anti-wear index is: after rotating 200 turns by the testing method of barrate strength, calculates in agglomerate and is less than the per-cent that 0.5mm grade agglomerate accounts for whole agglomerate weight.
The method of calculation of yield rate are: pour out after agglomerate is burned, carry out naturally cooling, fall 2 times, sieve from 2m eminence, get the percent basis yield rate of > 10mm grain size content.
Embodiment 1
The present embodiment is for illustration of raw materials for sintering composition of the present invention and vanadium titanium agglomerate and preparation method thereof.
The silica obtained through fragmentation, Wingdale, rhombspar, quickened lime, coke powder and extra large sand v-ti magnetite concentrate are prepared burden according to the proportioning of table 2, mix with water (comprising one dark even two mixed granulation), obtained compound, the mean particle size of compound is 2.8mm, the content of fixed carbon is 2.90 % by weight, the content of water is 7.25 % by weight, and basicity is 2.10.
This compound is carried out cloth on magnetic roller distributor, and bed thickness is 650mm, and then binder makes the bed of material depress 20mm, and is added on chassis, and at 1050 DEG C, carry out sintering 45min, sintering velocity is 14.57mm/min, obtains vanadium titanium agglomerate A.TFe, SiO of vanadium titanium agglomerate A
2content and mean particle size, yield rate and mechanical properties as shown in table 4.
Embodiment 2-7
Embodiment 2-7 is for illustration of raw materials for sintering composition of the present invention and vanadium titanium agglomerate and preparation method thereof.
In embodiment 2-7, silica, Wingdale, rhombspar, quickened lime, coke powder and extra large sand v-ti magnetite concentrate are prepared burden according to the proportioning shown in table 2 respectively, mix with water (comprising one dark even two mixed granulation), obtained compound.The mean particle size of compound, the basicity of the content of fixed carbon wherein, the content of water and compound is as shown in table 3 respectively.
Compound is carried out cloth and binder on magnetic roller distributor, and binder makes the bed of material depress 20mm and be added on chassis, at 1050 DEG C, carry out sintering 40min.Wherein, bed thickness, sintering velocity, as shown in table 3 respectively, obtain vanadium titanium agglomerate B-G.TFe, SiO of vanadium titanium agglomerate B-G
2content and mean particle size, yield rate and mechanical properties as shown in table 4.
Comparative example 1
Adopt the method identical with embodiment 1 to prepare vanadium titanium agglomerate, difference is, does not add silica, thus obtained vanadium titanium agglomerate D1.The mean particle size of compound, fixed carbon content, water-content and basicity thereof wherein, bed depth and sintering velocity as shown in table 3, TFe, SiO of vanadium titanium agglomerate D1
2content and mean particle size, yield rate and mechanical properties as shown in table 4.
Comparative example 2
Adopt the method identical with embodiment 1 to prepare vanadium titanium agglomerate, difference is, with the common iron ore of the high silicon (TFe:40 % by weight, SiO accounting for raw materials for sintering composition 10 % by weight
2: the silica 20 % by weight) replacing embodiment 1, thus obtained vanadium titanium agglomerate D2.The mean particle size of compound, fixed carbon content, water-content and basicity thereof wherein, bed depth and sintering velocity as shown in table 3; TFe, SiO of vanadium titanium agglomerate D2
2content and mean particle size, yield rate and mechanical properties as shown in table 4.
Table 2
| Numbering | Vanadium ilmenite concentrate | High silica | Rhombspar | Wingdale | Quickened lime | Coke powder |
| Embodiment 1 | 73.5 | 2.7 | 6 | 8 | 5 | 4.8 |
| Embodiment 2 | 74.5 | 3 | 5.5 | 7 | 5 | 5 |
| Embodiment 3 | 75.5 | 3.2 | 5 | 6 | 5 | 5.3 |
| Embodiment 4 | 76.5 | 3.4 | 4 | 5 | 5.5 | 5.6 |
| Embodiment 5 | 77.5 | 3.6 | 3.2 | 4.5 | 6 | 5.2 |
| Embodiment 6 | 78 | 3.8 | 3 | 4 | 6.5 | 4.7 |
| Embodiment 7 | 74 | 7 | 2.8 | 3.8 | 7.3 | 5.1 |
| Comparative example 1 | 76.2 | - | 6 | 8 | 5 | 4.8 |
| Comparative example 2 | 66 | 10* | 5 | 9 | 5 | 5.0 |
*: the common iron ore of high silicon, median size is 3.5mm.
Table 3
*: sintering velocity refers to: the bed thickness that the unit time burns.
Table 4
As can be seen from Table 4, the barrate strength of the vanadium titanium agglomerate that method of the present invention obtains can reach more than 69%, and anti-wear index can reach less than 4.61%, and yield rate can reach more than 71%.Compared with comparative example 1, the vanadium titanium agglomerate adopting method of the present invention to prepare has higher intensity, compared with comparative example 2, the intensity of vanadium titanium agglomerate of the present invention is also higher, and the common iron ore of high silicon of prior art in raw materials for sintering composition of the present invention, is replaced with silica, the sintering of full sea sand vanadium titano-magnetite can be realized, because this reducing the cost of vanadium titano-magnetite.
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 (12)
1. a raw materials for sintering composition, this raw materials for sintering composition contains v-ti magnetite concentrate, rhombspar, Wingdale, quickened lime and fuel, it is characterized in that, described v-ti magnetite concentrate is extra large sand v-ti magnetite concentrate, and described raw materials for sintering composition is also containing silica.
2. raw materials for sintering composition according to claim 1, wherein, with the gross weight of described raw materials for sintering composition for benchmark, the content of described extra large sand v-ti magnetite concentrate is 73-80 % by weight, the content of described rhombspar is 2-10 % by weight, and the content of described Wingdale is 2-11 % by weight, and the content of described quickened lime is 5-8 % by weight, the content of described silica is 2-10 % by weight, the content 4.5-6 % by weight of described fuel.
3. raw materials for sintering composition according to claim 1 and 2, wherein, the granularity of described rhombspar, Wingdale, quickened lime and silica is all not more than 3mm, and the granularity of described fuel is not more than 5mm.
4. raw materials for sintering composition according to claim 1 and 2, wherein, the granularity of described extra large sand v-ti magnetite concentrate is not more than 1mm, and with the gross weight of described extra large sand v-ti magnetite concentrate for benchmark, granularity be below 200 orders account for more than 60 % by weight.
5. raw materials for sintering composition according to claim 1 and 2, wherein, described fuel is coke powder.
6. raw materials for sintering composition according to claim 1 and 2, wherein, with oxide basis, TiO in described extra large sand v-ti magnetite concentrate
2content be 5-13 % by weight, SiO
2content is below 0.3 % by weight;
Preferably, with oxide basis, other chemical constitutions of described extra large sand v-ti magnetite concentrate comprise: the Al of CaO, 2-3.4 % by weight of TFe, 0.3-1 % by weight of more than 56 % by weight
2o
3, 1-2.5 % by weight the V of MgO, 0.5-0.8 % by weight
2o
5, the P of less than the 0.1 % by weight and S of less than 0.3 % by weight, and the content of FeO is 20-30 % by weight.
7. a preparation method for vanadium titanium agglomerate, the method comprises:
(1) the raw materials for sintering composition in claim 1-6 described in any one is made compound;
(2) described compound is carried out cloth, binder and sintering.
8. method according to claim 7, wherein, in step (1), the process preparing mangcorn comprises one dark even two mixed granulation, and in described compound, the content of water is 7.2-7.6 % by weight.
9. the method according to claim 7 or 8, wherein, in described compound, the content of fixed carbon is 2.7-3.1 % by weight.
10. method according to claim 7, wherein, the process of described cloth comprises: the height controlling the bed of material is 630-670mm.
11. 1 kinds of vanadium titanium agglomerate prepared by method described in any one in claim 7-10.
12. vanadium titanium agglomerate according to claim 11, wherein, the mean particle size of described vanadium titanium agglomerate is 13-20mm, and in described vanadium titanium agglomerate, the content of TFe is 51-53 % by weight, SiO
2content be 4.8-5.5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111484078A (en) * | 2020-05-14 | 2020-08-04 | 中国科学院过程工程研究所 | Method for preparing vanadium pentoxide from vanadium-titanium magnetite |
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| CN103924063A (en) * | 2014-04-04 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for sintering all-vanadium titanium magnetite concentrate |
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| JPS62164837A (en) * | 1986-01-17 | 1987-07-21 | Ishikawajima Harima Heavy Ind Co Ltd | Sintering method |
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| CN111484078A (en) * | 2020-05-14 | 2020-08-04 | 中国科学院过程工程研究所 | Method for preparing vanadium pentoxide from vanadium-titanium magnetite |
| CN111484078B (en) * | 2020-05-14 | 2021-06-08 | 中国科学院过程工程研究所 | Method for preparing vanadium pentoxide from vanadium-titanium magnetite |
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