CN104060083A - Sintering method of vanadium titanium magnetite - Google Patents
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Abstract
The invention discloses a sintering method of a vanadium titanium magnetite. The method includes successively carrying out material placing, material pressing and sintering after granulating a sintering raw material. The sintering raw material contains the vanadium titanium magnetite, a high-grade ore, a fuel and a flux, wherein the flux is active lime; relative to 100 parts by weight of the vanadium titanium magnetite, the content of the fuel is 3.5-6.5 parts by weight, and the content of the flux is 10-18 parts by weight; the moisture content in the sintering mixture obtained from granulation is 5-8 wt%, and the content of the sintering mixture with the particle diameter of 3-6 mm is more than 80%; the material placing makes the material layer thickness be 550-850 mm, and a sintering condition includes that the vacuum degree in the sintering process is 8-15 kPa. Through the technical scheme, the sintering method makes the finished product rate of a finished product sintered ore increased to 72% or more and the drum strength (ISO) reaching 76% or more, thereby improving the production efficiency.
Description
Technical field
The present invention relates to a kind of sintering method of vanadium titano-magnetite.
Background technology
V-ti magnetite concentrate has the total amount of TFe(iron in ore element) and SiO
2content is low, TiO
2content is high, granularity is large, balling-up and the poor feature of water-absorbent, therefore easy-sintering not.
Along with fluxed sinter is applied on blast furnace, lime has little by little caused people's attention as a kind of promoting agent of agglomerate.And the sintering method of the vanadium titano-magnetite of prior art is generally used the mixture of quickened lime and Wingdale, or combined lime and Wingdale are as flux, coke powder as fuel after crusher in crushing, by broken flux and fuel and v-ti magnetite concentrate, as rich ore is granulated with climbing after concentrate mixes in drum mixer, reinstall in pallet with lighter for ignition igniting and carry out down draft sintering, and adopt, the barrate strength of the finished product agglomerate that the sintering method of prior art obtains is only 74.5%, yield rate is only 80.3%.
In the sintering method of prior art, the flux of use generally comprises quickened lime and Wingdale, and the weight ratio of the two is about 2:1.But the present inventor finds, flux is all replaced with quickened lime, control coke powder with the consumption of quickened lime and particle diameter and the moisture content of granulation gained sinter mixture simultaneously and coordinate applicable sintering condition, can significantly improve intensity and the yield rate of the agglomerate that sintering obtains.
To achieve these goals, the invention provides a kind of sintering method of vanadium titano-magnetite, the method comprises and will after raw materials for sintering granulation, carry out successively cloth, binder and sintering, described raw materials for sintering contains vanadium titano-magnetite, rich ore, fuel and flux, wherein, described flux is quickened lime, with respect to the vanadium titano-magnetite of 100 weight parts, the content of described fuel is 3.5-6.5 weight part, and the content of described flux is 10-18 weight part; In described granulation gained sinter mixture, moisture content is 5-8 % by weight, and the content of the sinter mixture that particle diameter is 3-6mm is more than 80%, it is 550-850mm that described cloth makes bed thickness, and the condition of described sintering comprises that the vacuum tightness in sintering process is 8-15kPa.
Pass through technique scheme, optimized sintering process, thereby mineral composition and the structure of agglomerate have been improved, improved the output of agglomerate, sintering method of the present invention is brought up to more than 72% the yield rate of finished product agglomerate, barrate strength (ISO) reaches more than 76%, thereby has improved production efficiency.Especially, the content by controlling fuel and flux, in the preferred scope of the present invention, can further improve yield rate and/or the barrate strength of agglomerate.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Summary of the invention
The object of the invention is to overcome the intensity and the not high problem of yield rate that adopt the agglomerate that the sintering method of prior art prepares, a kind of sintering method that can improve the intensity of finished product agglomerate and the vanadium titano-magnetite of yield rate is provided.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that not doing contrary explanation, the term of use " activity degree " represents by the speed of response of lime and water conventionally, namely at standard atmosphere, depresses, in 10min, 50g lime is dissolved in the milliliter number of the 4N HCl aqueous solution that consumes in 40 ℃ of thermostat(t)ed waters.The height value that when " draught " is binder, raw materials for sintering is depressed at short transverse pressurized.Draught is larger, extends accordingly and spreads also larger.
The sintering method of vanadium titano-magnetite provided by the invention comprises and will after raw materials for sintering granulation, carry out successively cloth, binder and sintering, described raw materials for sintering contains vanadium titano-magnetite, rich ore, fuel and flux, wherein, described flux is quickened lime, with respect to the vanadium titano-magnetite of 100 weight parts, the content of described fuel is 3.5-6.5 weight part, is preferably 4-6 weight part, the content of described flux is 10-18 weight part, is preferably 10-15 weight part; In described granulation gained sinter mixture, moisture content is 5-8 % by weight, and the content of the sinter mixture that particle diameter is 3-6mm is more than 80% (to be preferably 80-85%), it is 550-850mm that described cloth makes bed thickness, be preferably 600-800mm, the condition of described sintering comprises that the vacuum tightness in sintering process is 8-15kPa, is preferably 10-13kPa.
According to the present invention, the content of fuel or flux departs from second-rate (for example intensity is lower) of the agglomerate that above-mentioned scope obtains, therefore, control as the quickened lime of flux and the consumption of fuel and can avoid well within the scope of the invention the problems referred to above also to improve the quality of the agglomerate obtaining.More preferably, the weight ratio of described fuel and flux is 1:(1.6-3), the present inventor finds, the weight ratio of controlling fuel and flux can further improve the quality of the agglomerate that sintering obtains in above-mentioned scope.
According to the present invention, described quickened lime can be usually used in the quickened lime in sintering process for this area.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.
Preferably, in described quickened lime, the content of CaO is 90-95 % by weight.The activity degree of described quickened lime is preferably 280-400mL.
According to the present invention, described fuel can be the conventional various fuel that use in this area, and for example, described fuel can be selected from coke powder and/or coal.
According to the present invention, in order to realize utilization of waste material, reduce the impact on environment, preferably, described raw materials for sintering also contains iron-bearing auxiliary material.Content to described iron-bearing auxiliary material has no particular limits, and with respect to the vanadium titano-magnetite of 100 weight parts, in ferro element, the content of described iron-bearing auxiliary material is preferably 4-6 weight part.Described iron-bearing auxiliary material can be the conventional various iron-bearing auxiliary materials that use in this area, and its TFe content is generally 25-60 % by weight.For example, described iron-bearing auxiliary material can be selected from one or more in gas ash, slag and dedusting mud.Described gas ash, slag and dedusting mud are ironmaking or the conventional solid waste producing of field of steel-making, and the above-mentioned solid waste that can directly use blast furnace and steel-making to produce, also can be by commercially available.Usually:
In gas ash, TFe content is generally 30-45 % by weight, and carbon content is generally 8-20 % by weight.
In slag, CaO content is generally 30-40 % by weight, and MgO content is generally 5-7 % by weight, and FeO content is generally 4-5 % by weight, SiO
2content is generally 7-8 % by weight.
In dedusting mud, TFe content is generally 27-65 % by weight, SiO
2content is generally 2-10 % by weight, V
2o
5content is generally 0.01-0.3 % by weight, and CaO content is generally 1-9 % by weight.
According to the present invention, described rich ore can be the conventional higher ore of various iron-holder in this area, can be by commercially available, and usually, in the rich ore of use, TFe content is 58-70 % by weight, wherein the content of FeO is 10-35 % by weight.With respect to 100 weight part vanadium titano-magnetites, the consumption of rich ore is generally 10-30 weight part.In addition, can obtain rich ore by the means of various routines, not repeat them here.
The method of described granulation can be conventional method of granulating, as long as the particle diameter of the sinter mixture after assurance is granulated and moisture content are in the framework of the present definition.The mode that raw materials for sintering is granulated generally comprises mixes raw materials for sintering to granulate with water.Under preferable case, the mode that raw materials for sintering is granulated is for carrying out raw materials for sintering successively one dark even two mixed granulation, in one dark even products therefrom, moisture content is 4-7 % by weight, and the content of the product that particle diameter is 3-6mm (i.e. a dark even products therefrom) is 50-60%, in two mixed granulation gained sinter mixtures, moisture content is 5-8 % by weight, and the content of the particle diameter sinter mixture that is 3-6mm is more than 80% (to be preferably 80-85%).
Usually, a dark even method comprises raw materials for sintering and water mixing 2-4min, and with respect to the vanadium titano-magnetite of 100 weight parts, a water consumption of drifting along or through when even is 5-7 weight part.
Usually, two mixed methods of granulating comprise that, by a dark even products therefrom and water mixing 2-4min, with respect to the vanadium titano-magnetite of 100 weight parts, water consumption during two mixed granulations is 1-2.5 weight part.
According to the present invention, as long as described cloth makes bed thickness in above-mentioned scope, other cloth condition and distributing process can adopt the condition of this area routine and method to carry out, and do not repeat them here.
According to the present invention, described method is carried out binder after being also included in cloth, makes the tap density of sinter mixture increase, and the contact of sinter mixture particle is tight, thereby effectively reduces sintering velocity, extends the high temperature hold-time, makes crystallizable mineral more abundant.The method of described binder can be the conventional pressing method for feed of this area.Preferably, it is 5-10mm that described binder makes the draught of the bed of material, further to improve above-mentioned effect.
According to the present invention, as long as guarantee that the vacuum tightness in sintering process can realize object of the present invention in above-mentioned scope, other sintering conditions all can adopt the routine value of this area as ignition temperature, ignition time and vacuum ignition degree etc.Preferably, the condition of described sintering comprises that ignition temperature is 1000-1100 ℃, and be 2-4min ignition time, and vacuum ignition degree is 6-7kPa.When carrying out sintering under above-mentioned preferred condition, can further improve intensity and the yield rate of finished product agglomerate.Wherein, described vacuum tightness refers to that pressure actual numerical value in agglomerating plant is lower than the numerical value of atmospheric pressure.
According to the present invention, described vanadium titano-magnetite can be the various vanadium titano-magnetites of nature existence.Preferably, V in described vanadium titano-magnetite
2o
5content be 0.3-0.9 % by weight, TiO
2content be 8-14 % by weight, the total iron of TFe() content be 50-58 % by weight, SiO
2content be 3-3.5 % by weight.
Under preferable case, sintering method of the present invention also comprises the step of the sintered product obtaining after sintering being carried out to the routines such as heat sieve, cooling and whole grain, thereby obtains finished product agglomerate.The method of heat sieve, cooling and whole grain is well known to those skilled in the art, and does not repeat them here.
Below will describe the present invention by embodiment.
In following examples and comparative example, unreceipted actual conditions is to carry out according to normal condition.Vanadium titano-magnetite used is Bai Makuang, and its main composition is: TFe:56.56 % by weight, FeO:31.55 % by weight, SiO
2: 2.80 % by weight, V
2o
5: 0.724 % by weight, TiO
2: 10.72 % by weight, other: 29.196 % by weight; Rich ore comprises imported ore fines, domestic higher-grade fine ore and medium grade breeze, and consumption is 27 weight part/100 weight part vanadium titano-magnetites; Iron-bearing auxiliary material comprises gas ash and slag, imported ore fines, domestic higher-grade fine ore, medium grade breeze, the weight ratio of slag and gas ash is 4:7.5:2:1.5:1, wherein, imported ore fines, domestic higher-grade breeze and medium grade powder originate from respectively India, Dali and Huidong County, Yunnan, and gas ash and slag are respectively the Pan Gang of Pan Gang group vanadium company limited's iron work and steelworks is produced; The carbon content of coke powder is 84.6 % by weight, and volatilization is divided into 2.12 % by weight, ash content is 13.16 % by weight, the screen underflow that Pan Gang Coal Chemical Industry company produces; The CaO content of quickened lime is 95 % by weight, and activity degree is 350mL; The CaO content of Wingdale is 53.96 % by weight, climbs steel limestone mine and produces.
In following examples and comparative example, the measuring method of the barrate strength of finished product agglomerate is as follows:
By moisture determination instrument, (moisture content SH-10A) detects in Shanghai Precision Scientific Apparatus Co., Ltd.
According to the ISO barrate strength of GB13242 definition, refer to get 7.5 kilograms of 40-10mm agglomerate in ISO drum unit, rotate 200 turn after, > 6.3mm grade agglomerate accounts for the per-cent of whole agglomerate weight, it is the important indicator of weighing sinter strength, higher, represent that the intensity of agglomerate is better.Adopt in the present invention SQZG-4 type ISO drum unit (Hebi City metallurgical machinery equipment company limited) to measure.
The method of calculation of yield rate are: after agglomerate is burned, pour out, carry out naturally cooling, from 2m eminence, fall 2 times, sieve, get the percentage ratio meter yield rate of > 10mm grain size content.
Embodiment 1
By vanadium titano-magnetite, the raw materials for sintering such as quickened lime and coke powder is by the consumption mixing granulation of table 1 (carrying out successively one dark even two mixed mode of granulating), the weight of the sinter mixture that in granulation gained sinter mixture (moisture content is 7 % by weight), particle diameter is 3-6mm accounts for 80% of sinter mixture gross weight, this sinter mixture is packed in distributor and is distributed in sintered cup, the height that makes the bed of material is 700mm, then carrying out binder, to make the draught of the bed of material be 8mm, sintering 40min at 1350 ℃ again, the ignition temperature of sintering is 1050 ℃, be 3min ignition time, the vacuum tightness of controlling in sintering process is 12kPa, obtain vanadium titanium agglomerate, the strength test of this agglomerate is the results detailed in Table 1.
Comparative example 1
According to the method sintering vanadium titano-magnetite of embodiment 1, different, the moisture content of granulation gained sinter mixture is 9 % by weight, and the weight of the particle diameter sinter mixture that is 3-6mm accounts for 81% of sinter mixture gross weight, the barrate strength of the agglomerate obtaining is 72%, and yield rate is 76%.
Comparative example 2
According to the method sintering vanadium titano-magnetite of embodiment 1, different, " quickened limes of 12 weight parts " use " Wingdales of the quickened lime of 8 weight parts and 4 weight parts " replaces, and the barrate strength of the agglomerate obtaining is 70%, and yield rate is 74%.
Comparative example 3
According to the method sintering vanadium titano-magnetite of embodiment 1, different, the height of the bed of material is 880mm, and the barrate strength of the agglomerate obtaining is 71%, and yield rate is 75%.
Comparative example 4
According to the method sintering vanadium titano-magnetite of embodiment 1, different, the vacuum tightness of controlling in sintering process is 7kPa, and the barrate strength of the agglomerate obtaining is 71.5%, and yield rate is 74.9%.
Embodiment 2
By vanadium titano-magnetite, the raw materials for sintering such as quickened lime and coke powder is by the consumption mixing granulation of table 1 (carrying out successively one dark even two mixed mode of granulating), the weight of the sinter mixture that in granulation gained sinter mixture (moisture content is 8.0 % by weight), particle diameter is 3-6mm accounts for 83% of sinter mixture gross weight, this sinter mixture is packed in distributor and is distributed in sintered cup, the height that makes the bed of material is 600mm, then carrying out binder, to make the draught of the bed of material be 5mm, sintering 40min at 1350 ℃ again, the ignition temperature of sintering is 1030 ℃, be 2min ignition time, the vacuum tightness of controlling in sintering process is 10kPa, obtain vanadium titanium agglomerate, the strength test of this agglomerate is the results detailed in Table 1.
Embodiment 3
By vanadium titano-magnetite, the raw materials for sintering such as quickened lime and coke powder is by the consumption mixing granulation of table 1 (carrying out successively one dark even two mixed mode of granulating), the weight of the sinter mixture that in granulation gained sinter mixture (moisture content is 7.5 % by weight), particle diameter is 3-6mm accounts for 85% of sinter mixture gross weight, this sinter mixture is packed in distributor and is distributed in sintered cup, the height that makes the bed of material is 800mm, then carrying out binder, to make the draught of the bed of material be 10mm, sintering 40min at 1350 ℃ again, the ignition temperature of sintering is 1060 ℃, be 4min ignition time, the vacuum tightness of controlling in sintering process is 13kPa, obtain vanadium titanium agglomerate, the strength test of this agglomerate is the results detailed in Table 1.
Table 1
Embodiment 4
According to the method sintering vanadium titano-magnetite of embodiment 1, different, the consumption of coke powder is 4 weight parts, and the consumption of flux is 14 weight parts, and the barrate strength of the agglomerate obtaining is 73%, and yield rate is 76.5%.
As can be seen from the above embodiments, sintering method of the present invention has improved barrate strength and the yield rate of agglomerate, has reduced the consumption of fuel simultaneously, thereby has reduced the production cost of agglomerate.Embodiment 1-3 and embodiment 4 are compared and can be found out, when the weight ratio of fuel and flux is in the preferred scope of the present invention, can further improve barrate strength and the yield rate of agglomerate.Comparing embodiment 1 can be found out with comparative example 1-4, control each sintering condition and can obtain the agglomerate that quality is higher in the framework of the present definition.
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 characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, 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. the sintering method of a vanadium titano-magnetite, the method comprises and will after raw materials for sintering granulation, carry out successively cloth, binder and sintering, described raw materials for sintering contains vanadium titano-magnetite, rich ore, fuel and flux, it is characterized in that, described flux is quickened lime, with respect to the vanadium titano-magnetite of 100 weight parts, the content of described fuel is 3.5-6.5 weight part, and the content of described flux is 10-18 weight part; In described granulation gained sinter mixture, moisture content is 5-8 % by weight, and the content of the sinter mixture that particle diameter is 3-6mm is more than 80 % by weight, it is 550-850mm that described cloth makes bed thickness, and the condition of described sintering comprises that the vacuum tightness in sintering process is 8-15kPa.
2. method according to claim 1, wherein, with respect to the vanadium titano-magnetite of 100 weight parts, the content of described fuel is 4-6 weight part, the content of described flux is 10-15 weight part.
3. method according to claim 1 and 2, wherein, the weight ratio of described fuel and flux is 1:1.6-3.
4. method according to claim 1 and 2, wherein, in described quickened lime, the content of CaO is 90-95 % by weight, activity degree is 280-400mL.
5. method according to claim 1 and 2, wherein, described fuel is selected from coke powder and/or coal.
6. method according to claim 1, wherein, described raw materials for sintering also contains iron-bearing auxiliary material, and with respect to the vanadium titano-magnetite of 100 weight parts, in ferro element, the content of described iron-bearing auxiliary material is 4-6 weight part; Described iron-bearing auxiliary material is selected from one or more in gas ash, slag and dedusting mud.
7. method according to claim 1, wherein, the content of the sinter mixture that in described granulation gained sinter mixture, particle diameter is 3-6mm is 80-85%.
8. according to the method described in claim 1 or 7, wherein, the mode that raw materials for sintering is granulated is for carrying out raw materials for sintering successively one dark even two mixed granulation, one dark even method comprises mixes raw materials for sintering with water, in one dark even products therefrom, moisture content is 4-7 % by weight, and the content of the particle diameter product that is 3-6mm is 50-60%; Two mixed methods of granulating comprise mixes a dark even products therefrom with water, two to mix moisture content in granulation gained sinter mixtures be 5-8 % by weight, and the content of the particle diameter sinter mixture that is 3-6mm is more than 80%.
9. method according to claim 1, wherein, it is 600-800mm that described cloth makes bed thickness.
10. method according to claim 1, wherein, it is 5-10mm that described binder makes the draught of the bed of material.
11. methods according to claim 1, wherein, the condition of described sintering comprises that ignition temperature is 1000-1100 ℃, and be 2-4min ignition time, and vacuum ignition degree is that the vacuum tightness in 6-7kPa and sintering process is 10-13kPa.
12. methods according to claim 1, wherein, V in described vanadium titano-magnetite
2o
5content be 0.3-0.9 % by weight, TiO
2content be 8-14 % by weight, the content of TFe is 50-58 % by weight, SiO
2content be 3-3.5 % by weight.
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| CN104232885A (en) * | 2014-09-28 | 2014-12-24 | 四川德胜集团钒钛有限公司 | Method for blending ore of vanadium-titanium sintered ore |
| CN104263915A (en) * | 2014-09-28 | 2015-01-07 | 四川德胜集团钒钛有限公司 | Preparation method of high vanadium titanium sintering ore |
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| CN104561530A (en) * | 2014-12-26 | 2015-04-29 | 河北钢铁股份有限公司承德分公司 | Medium-titanium high-strength sintered ore and preparation method thereof |
| CN104630451A (en) * | 2015-02-09 | 2015-05-20 | 东北大学 | Preparation method of high-chromium vanadium-titanium sintered mixed pellet material |
| CN104846191A (en) * | 2015-04-20 | 2015-08-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-titanium sinter and preparation method thereof |
| CN107881329A (en) * | 2017-11-23 | 2018-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of superhigh-alkalinity vanadium-titanium magnitite sinter and its production method |
| CN110129553A (en) * | 2019-05-21 | 2019-08-16 | 攀钢集团攀枝花钢铁研究院有限公司 | The preparation method of high-ferrum low-silicon vanadium-titanium sinter |
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