CN104060083B - Sintering method of vanadium titanium magnetite - Google Patents
Sintering method of vanadium titanium magnetite Download PDFInfo
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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 TFe(The total amount of iron in ore element)And SiO2Content is low, TiO2Content is high, granularity is big,
Balling-up and the feature of water absorption difference, therefore not easy-sintering.
Be applied on blast furnace with fluxed sinter, Calx as sintering deposit a kind of promoting agent little by little
Cause the attention of people.And the sintering method of the vanadium titano-magnetite of prior art generally uses the mixed of active lime and limestone
Compound, or combined lime and limestone is as flux, coke powder as fuel after crusher in crushing, by broken flux and
Fuel and v-ti magnetite concentrate, such as rich ore are pelletized after concentrate mix homogeneously in trommel mixer with climbing, and reinstall pallet
Middle igniter fire carries out down draft sintering, and the drum strength of the finished product sintering deposit being obtained using the sintering method of prior art
It is only 74.5%, yield rate and be only 80.3%.
Content of the invention
The purpose of the present invention is to overcome intensity and the one-tenth of the sintering deposit preparing using the sintering method of prior art
The not high problem of product rate, provides a kind of sintering side of the vanadium titano-magnetite of intensity that can improve finished product sintering deposit and yield rate
Method.
In the sintering method of prior art, the flux of use generally comprises active lime and limestone, the weight ratio of the two
It is about 2:1.But it was found by the inventors of the present invention that all replace flux with active lime, control coke powder and active lime simultaneously
Consumption and the particle diameter of granulation gained sinter mixture and moisture coordinate suitable sintering condition, Neng Gouxian
Write and improve the intensity of sintering deposit and the yield rate that sintering obtains.
To achieve these goals, the invention provides a kind of sintering method of vanadium titano-magnetite, the method includes burning
Knot raw material carries out cloth, binder and sintering after pelletizing successively, and described raw materials for sintering contains vanadium titano-magnetite, rich ore, fuel and melts
Agent, wherein, described flux is active lime, and with respect to the vanadium titano-magnetite of 100 weight portions, the content of described fuel is 3.5-
6.5 weight portions, the content of described flux is 10-18 weight portion;In described granulation gained sinter mixture, moisture is 5-8 weight
Amount %, and the content of the sinter mixture for 3-6mm for the particle diameter is more than 80%, it is 550- that described cloth makes thickness of feed layer
850mm, the vacuum that the condition of described sintering is included in sintering process is 8-15kPa.
By technique scheme, optimizing sintering process, thus improving mineral composition and the structure of sintering deposit, improving
The yield of sintering deposit, the sintering method of the present invention makes the yield rate of finished product sintering deposit bring up to more than 72%, drum strength
(ISO)Reach more than 76%, thus improve production efficiency.Especially, by controlling fuel preferred in the present invention with the content of flux
In the range of, yield rate and/or the drum strength of sintering deposit can be improved further.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific embodiment
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that it is described herein concrete
Embodiment is merely to illustrate and explains the present invention, is not limited to the present invention.
In the present invention, in the case of illustrating on the contrary, Calx and water generally used in the term " activity degree " of use
Response speed is representing, that is, at normal atmospheric pressure, in 10min, 50g Calx is dissolved in consumed 4N in 40 DEG C of thermostatted waters
The milliliter number of HCl/water solution." drafts " is that during binder raw materials for sintering is pressurized in short transverse and the height value that is depressed.Pressure
Amount is bigger, extends and spread also bigger accordingly.
The sintering method of the vanadium titano-magnetite that the present invention provides carries out cloth, binder after including raw materials for sintering is pelletized successively
And sintering, described raw materials for sintering contains vanadium titano-magnetite, rich ore, fuel and flux, and wherein, described flux is active lime, phase
For the vanadium titano-magnetite of 100 weight portions, the content of described fuel is 3.5-6.5 weight portion, and preferably 4-6 weight portion is described
The content of flux is 10-18 weight portion, preferably 10-15 weight portion;In described granulation gained sinter mixture, moisture is
5-8 weight %, and the content of the sinter mixture for 3-6mm for the particle diameter is more than 80%(It is preferably 80-85%), described cloth
Thickness of feed layer is made to be 550-850mm, preferably 600-800mm, the condition of described sintering includes the vacuum in sintering process
For 8-15kPa, preferably 10-13kPa.
According to the present invention, the content of fuel or flux deviates the second-rate of the sintering deposit that above range obtains(For example strong
Degree is relatively low), therefore, control and can keep away well within the scope of the invention as the active lime of flux and the consumption of fuel
Exempt from the problems referred to above and improve the quality of the sintering deposit obtaining.It is highly preferred that the weight of described fuel and flux is than for 1:(1.6-
3), it was found by the inventors of the present invention that controlling fuel and the weight of flux to sinter than improving further within the above range
The quality of the sintering deposit arriving.
According to the present invention, described active lime can be the active lime in sintering process commonly used in the art.Described work
Property Calx be also known as high reaction Calx or soft burnt lime, be a kind of high Calx of purity, have that bulk density is little, the porosity is high
(Generally more than 50%), the features such as crystallization is thin, intensity is big, specific surface area is big, sulfur content is little and reagency is strong, therefore, wide
General it is applied in sintering process.
Preferably, in described active lime, the content of CaO is 90-95 weight %.The activity degree of described active lime is preferably
280-400mL.
According to the present invention, described fuel can be various fuel commonly used in the art, and for example, described fuel can select
From coke powder and/or coal.
According to the present invention, in order to realize twice laid, the impact to environment for the minimizing is it is preferable that described raw materials for sintering also contains
There is iron-bearing auxiliary material.The content of described iron-bearing auxiliary material is had no particular limits, with respect to the vanadium titano-magnetite of 100 weight portions, with
Ferrum element meter, the content of described iron-bearing auxiliary material is preferably 4-6 weight portion.Described iron-bearing auxiliary material can be commonly used in the art
Various iron-bearing auxiliary materials, its TFe content is generally 25-60 weight %.For example, described iron-bearing auxiliary material can selected from gas ash, slag and
One or more of dedusting mud.Described gas ash, slag and dedusting mud be ironmaking or field of steel-making conventional produce consolidate
Body waste material, the above-mentioned solid waste that can be directly produced using blast furnace and steel-making is it is also possible to pass through commercially available.Usually:
In gas ash, TFe content is usually 30-45 weight %, and carbon content is usually 8-20 weight %.
In slag, CaO content is usually 30-40 weight %, and content of MgO is usually 5-7 weight %, and FeO content is usually 4-5
Weight %, SiO2Content is usually 7-8 weight %.
In dedusting mud, TFe content is usually 27-65 weight %, SiO2Content is usually 2-10 weight %, V2O5Content is usual
For 0.01-0.3 weight %, CaO content usually 1-9 weight %.
According to the present invention, described rich ore can be the higher Ore of various iron-holder commonly used in the art, can pass through business
Available from usually, in the rich ore of use, TFe content is 58-70 weight %, and wherein the content of FeO is 10-35 weight %.Relatively
In 100 weight portion vanadium titano-magnetites, the consumption of rich ore is generally 10-30 weight portion.Furthermore, it is possible to by various conventional means
Obtain rich ore, will not be described here.
The method of described granulation can be conventional method of granulating, as long as the granule of the sinter mixture after ensureing to pelletize is straight
Footpath and moisture are in the framework of the present definition.The mode that raw materials for sintering is pelletized generally comprise by raw materials for sintering with
Water mixing is pelletized.Under preferable case, mode that raw materials for sintering is pelletized is that raw materials for sintering carries out one successively is dark even
Two are blended grain, and in a dark even products therefrom, moisture is 4-7 weight %, and particle diameter is the product of 3-6mm(One mix
Mix products therefrom)Content be 50-60%, two to be blended in a gained sinter mixture moisture be 5-8 weight %, and granule
The content of the sinter mixture of a diameter of 3-6mm is more than 80%(It is preferably 80-85%).
Usually, a dark even method includes raw materials for sintering and water mixing 2-4min, with respect to the vanadium of 100 weight portions
Titanomagnetite, one dark even when water consumption be 5-7 weight portion.
Usually, two methods being blended grain include a dark even products therefrom and water mixing 2-4min, with respect to 100 weights
The vanadium titano-magnetite of amount part, two water consumptions when being blended are 1-2.5 weight portion.
According to the present invention, as long as described cloth makes thickness of feed layer within the above range, other cloth conditions and
Distributing method can be carried out using the conventional condition in this area and method, will not be described here.
According to the present invention, methods described carries out binder after being additionally included in cloth so that in the bulk density of sinter mixture
Rise, the contact of sinter mixture granule closely, thus being effectively reduced sintering velocity, extending high temperature hold time, making crystallizable mineral
More abundant.The method of described binder can be the conventional pressing method for feed of this area.Preferably, described binder makes the pressure of the bed of material
Measure as 5-10mm, to improve the effect above further.
According to the present invention, as long as the vacuum in guarantee sintering process can achieve the mesh of the present invention within the above range
, other sintering conditions such as firing temperature, the duration of ignition and vacuum ignition degree etc. all can adopt the conventional value of this area.Excellent
Selection of land, the condition of described sintering includes firing temperature and is 1000-1100 DEG C, and the duration of ignition is 2-4min, and vacuum ignition degree is 6-
7kPa.When above-mentioned preferably under the conditions of be sintered when, can further improve intensity and the yield rate of finished product sintering deposit.Its
In, described vacuum refers to the strong numerical value of pressure actual numerical value subatmospheric in agglomerating plant.
The various vanadium titano-magnetites that can be existed for nature according to the present invention, described vanadium titano-magnetite.Preferably, described
V in vanadium titano-magnetite2O5Content be 0.3-0.9 weight %, TiO2Content be 8-14 weight %, TFe(Total ferrum)Content be
50-58 weight %, SiO2Content be 3-3.5 weight %.
Under preferable case, the sintering method of the present invention also includes for the sintered product obtaining after sintering carrying out heat sieve, cooling
The conventional step with granulate etc., thus obtain finished product sintering deposit.The method of heat sieve, cooling and granulate is those skilled in the art institute
Know, will not be described here.
Hereinafter will be described the present invention by embodiment.
In following examples and comparative example, unreceipted actual conditions, be to carry out according to normal condition.V-ti magnetite used
Ore deposit is Bai Makuang, and its main composition is:TFe:56.56 weight %, FeO:31.55 weight %, SiO2:2.80 weight %, V2O5:
0.724 weight %, TiO2:10.72 weight %, other:29.196 weight %;Rich ore include imported ore fines, domestic high-grade fine ore and
Medium grade breeze, consumption is 27 weight portion/100 weight portion vanadium titano-magnetites;Iron-bearing auxiliary material includes gas ash and slag, import
Breeze, domestic high-grade fine ore, medium grade breeze, the weight of slag and gas ash is than for 4:7.5:2:1.5:1, wherein, enter
Mouth breeze, domestic high-grade breeze and medium grade powder originate from India, Dali and Yunnan Huidong County, gas ash and slag respectively
It is respectively Pan Gang group Pan Gang vanadium company limited's iron-smelter and steel mill is produced;The carbon content of coke powder is 84.6 weight %, volatile matters
It is 13.16 weight % for 2.12 weight %, ash, the siftage that Pan Gang Coal Chemical Industry company produces;The CaO content of active lime is 95 weights
Amount %, activity degree is 350mL;The CaO content of limestone is 53.96 weight %, climbs steel limestone mine and produces.
In following examples and comparative example, the assay method of the drum strength of finished product sintering deposit is as follows:
By moisture determination instrument(Shanghai Precision Scientific Apparatus Co., Ltd, SH-10A)Detection moisture.
According to the ISO drum strength of GB13242 definition, refer to take 7.5 kilograms of 40-10mm sintering deposits in ISO drum unit
After rotating 200 turns, > 6.3mm grade sintering deposit accounts for the percentage ratio of whole sintering deposit weight, is the important of measurement sinter strength
Index, higher, represent that the intensity of sintering deposit is better.Adopt SQZG-4 type ISO drum unit in the present invention(Hebi City metallurgical machinery
Equipment company limited)It is measured.
The computational methods of yield rate are:Pour out after sintering deposit is burned, carry out natural cooling, fall 2 times from 2m eminence, carry out
Screening, takes the percent meter yield rate of > 10mm grain size content.
Embodiment 1
The raw materials for sintering such as vanadium titano-magnetite, active lime and coke powder are pressed the consumption mixing granulation of table 1(Carry out one successively to mix
Mix the mode being blended grain with two), granulation gained sinter mixture(Moisture is 7 weight %)Middle particle diameter is 3-6mm's
The weight of sinter mixture accounts for the 80% of sinter mixture gross weight, this sinter mixture is loaded in distributing device and is distributed into sintered cup
Interior, the height making the bed of material is 700mm, and then carry out binder to make the drafts of the bed of material is 8mm, then sinters at 1350 DEG C
40min, the firing temperature of sintering is 1050 DEG C, and the duration of ignition is 3min, controls the vacuum in sintering process to be 12kPa, obtains
To vanadium titanium sintering deposit, the strength test results of this sintering deposit refer to table 1.
Comparative example 1
Method according to embodiment 1 sinters vanadium titano-magnetite, except for the difference that, the moisture of granulation gained sinter mixture
For 9 weight %, and particle diameter is that the weight of the sinter mixture of 3-6mm accounts for the 81% of sinter mixture gross weight, the burning obtaining
The drum strength of knot ore deposit is 72%, and yield rate is 76%.
Comparative example 2
Method according to embodiment 1 sinters vanadium titano-magnetite, except for the difference that, " active limes of 12 weight portions " use " 8 weight
The active lime of part and the limestone of 4 weight portions " replaces, and the drum strength of the sintering deposit obtaining is 70%, and yield rate is 74%.
Comparative example 3
Method according to embodiment 1 sinters vanadium titano-magnetite, and except for the difference that, the height of the bed of material is 880mm, the sintering obtaining
The drum strength of ore deposit is 71%, and yield rate is 75%.
Comparative example 4
Method according to embodiment 1 sinters vanadium titano-magnetite, and except for the difference that, the vacuum in control sintering process is
7kPa, the drum strength of the sintering deposit obtaining is 71.5%, and yield rate is 74.9%.
Embodiment 2
The raw materials for sintering such as vanadium titano-magnetite, active lime and coke powder are pressed the consumption mixing granulation of table 1(Carry out one successively to mix
Mix the mode being blended grain with two), granulation gained sinter mixture(Moisture is 8.0 weight %)Middle particle diameter is 3-6mm
The weight of sinter mixture account for the 83% of sinter mixture gross weight, this sinter mixture is loaded in distributing device and is distributed into sintering
In cup, the height making the bed of material is 600mm, and then carry out binder to make the drafts of the bed of material is 5mm, then sinters at 1350 DEG C
40min, the firing temperature of sintering is 1030 DEG C, and the duration of ignition is 2min, controls the vacuum in sintering process to be 10kPa, obtains
To vanadium titanium sintering deposit, the strength test results of this sintering deposit refer to table 1.
Embodiment 3
The raw materials for sintering such as vanadium titano-magnetite, active lime and coke powder are pressed the consumption mixing granulation of table 1(Carry out one successively to mix
Mix the mode being blended grain with two), granulation gained sinter mixture(Moisture is 7.5 weight %)Middle particle diameter is 3-6mm
The weight of sinter mixture account for the 85% of sinter mixture gross weight, this sinter mixture is loaded in distributing device and is distributed into sintering
In cup, the height making the bed of material is 800mm, and then carry out binder to make the drafts of the bed of material is 10mm, then sinters at 1350 DEG C
40min, the firing temperature of sintering is 1060 DEG C, and the duration of ignition is 4min, controls the vacuum in sintering process to be 13kPa, obtains
To vanadium titanium sintering deposit, the strength test results of this sintering deposit refer to table 1.
Table 1
Embodiment 4
Method according to embodiment 1 sinters vanadium titano-magnetite, and except for the difference that, the consumption of coke powder is 4 weight portions, the use of flux
Measure as 14 weight portions, the drum strength of the sintering deposit obtaining is 73%, and yield rate is 76.5%.
As can be seen from the above embodiments, the sintering method of the present invention improves drum strength and the yield rate of sintering deposit,
Decrease the consumption of fuel, thus reducing the production cost of sintering deposit simultaneously.Embodiment 1-3 is compared with embodiment 4
As can be seen that when the weight ratio of fuel and flux is when in currently preferred scope, can further improve the rotary drum of sintering deposit
Intensity and yield rate.Comparing embodiment 1 and comparative example 1-4 can be seen that the model controlling each sintering condition to limit in the present invention
It is obtained in that the higher sintering deposit of quality in enclosing.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, multiple simple variant can be carried out to technical scheme, this
A little simple variant belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy no longer separately illustrates.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it equally should be considered as content disclosed in this invention.
Claims (12)
1. a kind of sintering method of vanadium titano-magnetite, the method carry out successively after including raw materials for sintering is pelletized cloth, binder and
Sintering, described raw materials for sintering contains vanadium titano-magnetite, rich ore, fuel and flux it is characterised in that described flux is active stone
Ash, with respect to the vanadium titano-magnetite of 100 weight portions, the content of described fuel is 3.5-6.5 weight portion, and the content of described flux is
10-18 weight portion;In described granulation gained sinter mixture, moisture is 5-8 weight %, and particle diameter is the burning of 3-6mm
The content of knot compound is more than 80 weight %, and it is 550-850mm that described cloth makes thickness of feed layer, the condition bag of described sintering
Including the vacuum in sintering process is 8-15kPa.
2. method according to claim 1, wherein, with respect to the vanadium titano-magnetite of 100 weight portions, the content of described fuel
For 4-6 weight portion, the content of described flux is 10-15 weight portion.
3. method according to claim 1 and 2, wherein, the weight of described fuel and flux is than for 1:1.6-3.
4. method according to claim 1 and 2, wherein, in described active lime, the content of CaO is 90-95 weight %, lives
Property degree be 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, with respect to 100 weight portions
Vanadium titano-magnetite, in terms of ferrum element, the content of described iron-bearing auxiliary material is 4-6 weight portion;Described iron-bearing auxiliary material be selected from gas ash,
One or more of slag and dedusting mud.
7. method according to claim 1, wherein, in described granulation gained sinter mixture, particle diameter is 3-6mm's
The content of sinter mixture is 80-85%.
8. the method according to claim 1 or 7, wherein, the mode that raw materials for sintering is pelletized is to enter raw materials for sintering successively
Row one is drifted along or through and even two is blended grain, and an even method of drifting along or through includes mixing raw materials for sintering with water, in a dark even products therefrom
Moisture is 4-7 weight %, and the content of the product for 3-6mm for the particle diameter is 50-60%;Two methods being blended grain include by
One even products therefrom of drifting along or through mixes with water, and two to be blended in a gained sinter mixture moisture be 5-8 weight %, and granule is straight
Footpath is the content of the sinter mixture of 3-6mm is more than 80%.
9. method according to claim 1, wherein, it is 600-800mm that described cloth makes thickness of feed layer.
10. method according to claim 1, wherein, it is 5-10mm that described binder makes the drafts of the bed of material.
11. methods according to claim 1, wherein, the condition of described sintering includes firing temperature and is 1000-1100 DEG C,
The duration of ignition is 2-4min, and vacuum ignition degree is the vacuum in 6-7kPa and sintering process is 10-13kPa.
12. methods according to claim 1, wherein, V in described vanadium titano-magnetite2O5Content be 0.3-0.9 weight %,
TiO2Content be 8-14 weight %, the content of TFe is 50-58 weight %, SiO2Content be 3-3.5 weight %.
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