CN110184453A

CN110184453A - The sintering method of v-ti magnetite concentrate

Info

Publication number: CN110184453A
Application number: CN201910604189.8A
Authority: CN
Inventors: 付卫国; 郑魁; 胡鹏; 唐文博
Original assignee: Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Current assignee: Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2019-08-30
Anticipated expiration: 2039-07-05
Also published as: CN110184453B

Abstract

The present invention relates to v-ti magnetite concentrate preparation fields, especially a kind of sintering method for the v-ti magnetite concentrate for effectively improving sinter product quality: 5~10 parts by weight of the common fine ore of middle grade, 1~5 part of fluorite miberal powder, 65~75 parts of v-ti magnetite concentrate, 3~8 parts of agstone, 6~10 parts of active lime and 4.5~5 parts of coke powder are subjected to ingredient, the basicity for forming mixture, and controlling mixture is 1.8~2.4；It into mixture plus water, and is 7.2%~7.6% by the moisture weight percentage composition control in the mixture after water is added；First time mixing granulation and second of mixing granulation are carried out, sintering machine sintering is added in the material after second of mixing granulation, finally obtains finished product.The present invention controls the proportion of each material, realizes the sintering to v-ti magnetite concentrate, increases the Binder Phase of sinter, improves sintering process liquid phase production quantity, improves the intensity of vanadium-titanium magnitite sinter.Present invention is particularly suitable among the sintering process of v-ti magnetite concentrate.

Description

The sintering method of v-ti magnetite concentrate

Technical field

The present invention relates to v-ti magnetite concentrate preparation field, especially a kind of sintering method of v-ti magnetite concentrate.

Background technique

There is v-ti magnetite ore reserves abundant, especially Panxi Diqu to have a large amount of vanadium titano-magnetite in China, for climbing The sintering of western vanadium titano-magnetite and blast furnace smelting technology comparative maturity.But for blast furnace process, high-titanium blast furnace slag Melting temperature it is still higher, the mobility of clinker is poor, bring slag iron separation effect it is poor, smelt difficulty it is big the problems such as.It is right For sintering process, since v-ti magnetite concentrate has SiO₂Content is low, TiO₂The high feature of content causes v-ti magnetite smart Liquid phase generation temperature height during mine, liquid phase production quantity are few, cause sintering more difficult.

Summary of the invention

Technical problem to be solved by the invention is to provide a kind of v-ti magnetite essences for effectively improving sinter product quality The sintering method of mine.

The technical solution adopted by the present invention to solve the technical problems is: the sintering method of v-ti magnetite concentrate, including such as Lower step: by 5~10 parts by weight of the common fine ore of middle grade, 1~5 part of fluorite miberal powder, 65~75 parts of v-ti magnetite Concentrate, 3~8 parts of agstone, 6~10 parts of active lime and 4.5~5 parts of coke powder carry out ingredient, form mixture, and The basicity for controlling mixture is 1.8~2.4；Then, into mixture plus water, and the moisture weight in the mixture after water will be added Percentage composition control is 7.2%~7.6%；Finally, first time mixing granulation and second of mixing granulation are carried out, then by second Sintering machine sintering is added in material after secondary mixing granulation, finally obtains finished product.

Further, the ingredient of the v-ti magnetite concentrate contains by weight percentage not less than 56% TFe, small In 3% SiO₂, 0.5~1% CaO, 2~3% Al₂O₃, 0.5~0.8% V₂O₅, 9~12% TiO₂, be less than 0.01% P, S the and FeO content less than 0.3% are 20~30%.

Further, the ingredient of the common fine ore of middle grade contains the TFe not less than 50% by weight percentage And the SiO not less than 15~25%₂。

Further, the ingredient of the fluorite miberal powder contains the CaF not less than 60% by weight percentage₂And not SiO lower than 15%₂。

Further, in the step of forming the mixture, the common ore of the middle grade, fluorite miberal powder, lime stone The partial size of powder and active lime is not more than 3mm, and the granularity of the coke powder is not more than 5mm, and the granularity of v-ti magnetite concentrate is not more than 1mm can account for 80% or more by the particle of 200 meshes in v-ti magnetite concentrate.

Further, controlling fixed carbon in the step of formation mixture accounts for the 2.8~3.5% of mixture weight.

Further, when the material after second of mixing granulation is added to sintering machine sintering, the height of sinter bed Degree control is 750~850mm.

Further, the height control of the sinter bed is 780~820mm.

The beneficial effects of the present invention are: in actual use, since the present invention rationally controls the proportion of each material, realizing Sintering to v-ti magnetite concentrate, can increase the Binder Phase of sinter, effectively improve the liquid phase production quantity of sintering process, To improve the intensity of vanadium-titanium magnitite sinter.Present invention is particularly suitable among the sintering process of v-ti magnetite concentrate.

Specific embodiment

The sintering method of v-ti magnetite concentrate includes the following steps: 5~10 parts by weight of middle grade common flour Mine, 1~5 part of fluorite miberal powder, 65~75 parts of v-ti magnetite concentrate, 3~8 parts of agstone, 6~10 parts of active lime Coke powder with 4.5~5 parts carries out ingredient, forms mixture, and the basicity for controlling mixture is 1.8~2.4；Then, to mixing It in material plus water, and is 7.2%~7.6% by the moisture weight percentage composition control in the mixture after water is added；Finally, carrying out the Then sintering machine sintering is added, finally in material after second of mixing granulation by mixed once granulation and second of mixing granulation Obtain finished product.

For v-ti magnetite concentrate, since wherein TFe content is lower, TiO₂Content height, SiO₂Content is low, is being sintered Occur the low situation of amount of liquid phase in the process, this will cause the intensity of sinter low, and powder is more, seriously affect sinter yield and Quality.In the above-mentioned methods, being sufficiently mixed for first time mixing granulation, mainly realization material and water, realizes preliminary be blended； Second of mixing granulation realizes last granulating process, and obtain system to the end mainly on the basis of first time mixing granulation Material after grain.Due to the present invention middle grade common fine ore and fluorite fine ore relatively cheap using price, according to a certain percentage With being added in sinter mixture to increase sintering CaF₂Content reduces life so as to improve the quality of the sinter containing Cr-V-Ti Produce cost.

In order to further improve the quality of product obtained, such prioritization scheme can choose: the v-ti magnetite The ingredient of concentrate contains the TFe not less than 56%, the SiO less than 3% by weight percentage₂, 0.5~1% CaO, 2~ 3% Al₂O₃, 0.5~0.8% V₂O₅, 9~12% TiO₂, the P less than 0.01%, S the and FeO content less than 0.3% It is 20~30%；And select such scheme: the ingredient of the middle common fine ore of grade contains not low by weight percentage TFe in the 50% and SiO not less than 15~25%₂；And select such scheme: the ingredient of the fluorite miberal powder is by weight Amount percentages contain the CaF not less than 60%₂And the SiO not less than 15%₂。

As the optimization to mixture, can choose such scheme: in the step of forming the mixture, it is described in The common ore of grade, fluorite miberal powder, agstone and active lime partial size be not more than 3mm, the granularity of the coke powder is not more than 5mm, the granularity of v-ti magnetite concentrate are not more than 1mm, can be accounted for by the particle of 200 meshes in v-ti magnetite concentrate 80% with On.It is also possible to pass through the following scheme of selection: controlling fixed carbon in the step of the is formationed mixture and account for mixture weight 2.8~3.5%, and the basicity (CaO/SiO of mixture₂) it is 1.8~2.4, to further increase the quality of product.Wherein, excellent Form slection accounts for the 3.0~3.3% of mixture weight at control fixed carbon in the step of mixture.

In last sintering, for preferred feed when being added to sintering machine sintering, the height control of sinter bed is 750 The height control of~850mm, the further preferably sinter bed are 780~820mm.

Embodiment

Embodiment 1

Carry out the material mixing in following range by weight first:

A, it by the powder of the common ore reduction of middle grade to < 3mm, matches 5~10%.

B, fluorite ore is crushed to < the powder of 3mm, is matched 1~5%.

C, lime stone and active lime are crushed to<the powder of 3mm, active lime proportion>6%, lime stone is then according to burning The difference of knot basicity is adjusted, and general proportion is 3~8%.

D, the granularity of coke powder is controlled as < 5mm, proportion is 4.5~5%.

E, -200 mesh > 80% of granularity in v-ti magnetite concentrate, the proportion 65~75% of v-ti magnetite concentrate.

Water is added to be mixed according to the ratio the above material, mixture moisture 7.2%~7.6%, fixed carbon 3.0~3.3%, Basicity R0=1.8~2.4 of mixture, 750~850mm of bed depth.First time mixing granulation 4 ± 1min of time, second 4 ± 1min of mixing granulation time is added sintering machine and is sintered after mixing granulation is good.

Wherein:

Example 1 to 3 is carried out using exemplary embodiment of the present invention.

Crude fuel ingredient used in example 1 to 3 is shown in Table 1, and sintered material situation is shown in Table 2, the results are shown in Table 3。

Carbon content is fixed in the mixture of example 1 to 3 is followed successively by 3.06%, 3.18%, 3.30%；

The basicity R0 of the mixture of example 1 to 3 is followed successively by 1.85,1.90,1.95；

In example 1 to 3, in the mixture after adding water moisture weight percentage composition be followed successively by 7.30%, 7.40%, 7.50%.

1 original of table, fuel main chemical compositions/%

2 difference CaF of table₂Content sintering proportion (siccative)/parts by weight

Example	Vanadium ilmenite concentrate	The middle common ore of grade	Fluorite ore	Lime stone	Active lime	Coke powder
							1	70	8	2	6	7	4.6
2	70	7.5	2.5	5	8	4.8
							3	70	7	3	4	9	5.0

3 difference SiO of table₂Content is sintered main indicator

As can be seen from Table 3, with the increase of fluorite ore mix, drum strength, yield rate and the sintering speed of sinter Degree has certain increase, and for the drum strength for the sinter that method of the invention obtains up to 73% or more, anti-wear index is reachable 4.7% hereinafter, yield rate up to 72% or more.

Method of the invention overcomes due to SiO in v-ti magnetite concentrate₂Direct sintering is gone out caused by content is very low The problems such as existing sintering velocity is slow, sinter strength is poor realizes vanadium titanium by Fluorspar Additives fine ore and the common ore of middle grade The sinter of magnetite concentrate；And can gradually increasing with fluorite ore mix, the drum strength of sinter increases, at Product rate increases, usage factor increases, and effectively increases the yield and quality of sinter.Simultaneously because containing 1~3% in sinter CaF₂, the melting temperature of high titanium clinker will be reduced to subsequent blast furnace process, improve the mobile performance of clinker, to reinforcing blast furnace Smelting, improve slag iron separation effect, reducing iron loss etc. will play the role of apparent, and market promotion prospect is very wide.

Claims

1. the sintering method of v-ti magnetite concentrate, which comprises the steps of: by 5~10 parts of middle product by weight Position common fine ore, 1~5 part of fluorite miberal powder, 65~75 parts of v-ti magnetite concentrate, 3~8 parts of agstone, 6~10 parts Active lime and 4.5~5 parts of coke powder carry out ingredient, form mixture, and the basicity for controlling mixture is 1.8~2.4；

Then, into mixture plus water, and will add the moisture weight percentage composition control in the mixture after water for 7.2%~ 7.6%；

Finally, carrying out first time mixing granulation and second of mixing granulation, then the material after second of mixing granulation is added Sintering machine sintering, finally obtains finished product.

2. the sintering method of v-ti magnetite concentrate as described in claim 1, it is characterised in that: the v-ti magnetite concentrate at Divide by weight percentage containing TFe, the SiO less than 3% not less than 56%₂, 0.5~1% CaO, 2~3% Al₂O₃、 0.5~0.8% V₂O₅, 9~12% TiO₂, the P less than 0.01%, S the and FeO content less than 0.3% be 20~ 30%.

3. the sintering method of v-ti magnetite concentrate as described in claim 1, it is characterised in that: the middle common fine ore of grade Ingredient contains the TFe not less than the 50% and SiO not less than 15~25% by weight percentage₂。

4. the sintering method of v-ti magnetite concentrate as described in claim 1, it is characterised in that: the ingredient of the fluorite miberal powder is pressed Weight percent meter contains the CaF not less than 60%₂And the SiO not less than 15%₂。

5. the sintering method of the v-ti magnetite concentrate as described in claim 1,2,3 or 4, it is characterised in that: form the mixing In the step of material, the common ore of the middle grade, fluorite miberal powder, agstone and active lime partial size be not more than 3mm, it is described The granularity of coke powder is not more than 5mm, and the granularity of v-ti magnetite concentrate is not more than 1mm, can pass through 200 meshes in v-ti magnetite concentrate Particle account for 80% or more.

6. the sintering method of the v-ti magnetite concentrate as described in claim 1,2,3 or 4, it is characterised in that: the formation mixing Fixed carbon is controlled in the step of material accounts for the 2.8~3.5% of mixture weight.

7. the sintering method of the v-ti magnetite concentrate as described in claim 1,2,3 or 4, it is characterised in that: will mix for second When material after granulation is added to sintering machine sintering, the height control of sinter bed is 750~850mm.

8. the sintering method of v-ti magnetite concentrate as claimed in claim 7, it is characterised in that: the height control of the sinter bed It is made as 780~820mm.