CN107488784B - A kind of blast furnace ironmaking superfluxed pellets and its production method - Google Patents

A kind of blast furnace ironmaking superfluxed pellets and its production method Download PDF

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CN107488784B
CN107488784B CN201710794596.0A CN201710794596A CN107488784B CN 107488784 B CN107488784 B CN 107488784B CN 201710794596 A CN201710794596 A CN 201710794596A CN 107488784 B CN107488784 B CN 107488784B
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pelletizing
pellets
superfluxed
production
blast furnace
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CN107488784A (en
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杨佳龙
杨建�
郭其飞
李家新
佘文文
杨乐彪
汪志鹏
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Anhui University of Technology AHUT
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Anhui University of Technology AHUT
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/2406Binding; Briquetting ; Granulating pelletizing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/02Roasting processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders
    • C22B1/243Binding; Briquetting ; Granulating with binders inorganic

Abstract

The invention discloses a kind of blast furnace ironmaking superfluxed pellets and its production methods, belong to technical field of ferrous metallurgy.A kind of blast furnace ironmaking superfluxed pellets of the invention, the pellet are using concentrate powder, refining slag and bentonite as made of raw material, and the mass percent of each component is respectively as follows: concentrate powder 60-76%, refining slag 22-38%, bentonite 1.5-2.5%;The production method of superfluxed pellets of the invention, the steps include: raw material formed with addition of, green-ball, green-ball preheating, green-ball roasting, pelletizing it is cooling.The present invention is using concentrate powder and refining slag as raw material, the qualified basicity produced is up to 2.0 or more, high basicity sinter can be substituted completely as main feed stock for blast furnace, and realize the internal consumption of waste residue, solve the stacking and pollution problem of waste, energy consumption and disposal of pollutants are reduced while reducing pelletizing production and Solid state fermentation cost, and the pelletizing compression strength produced is big, S content is low, metallurgical performance is excellent.

Description

A kind of blast furnace ironmaking superfluxed pellets and its production method
Technical field
The invention belongs to technical field of ferrous metallurgy, are produced more specifically to a kind of using concentrate powder and refining slag The method of superfluxed pellets.
Background technique
In steel production, BF-BOF process is always in occupation of leading position, and blast furnace ironmaking is the main source of molten iron, 90% or more of the total pig iron yield of Zhan.Blast furnace ironmaking raw material mainly has iron ore, fuel, flux and air blast etc., China's blast furnace Burden structure is to use based on high basicity sinter, and the burden structure supplemented by acidic pellet ore and lump ore provides for blast furnace Iron-bearing material.The control of sinter and pellet basicity is also conducive to blast furnace slag making, guarantees basicity of slag and mobility, is conducive to blast furnace Desulfurization and tapping.But in entire steel production BF-BOF process, sintering process energy consumption accounts for 7.4%, pelletizing process accounting 1.2%;The environmental pollution that sintering process generates is also considerably beyond pelletizing process.The aggravation and environmental protection competed along with steel industry The increasingly increasing of pressure, cost efficiency, environmental-friendly production method are increasingly by the extensive concern of industry.Therefore, it produces Superfluxed pellets will become the new direction of the following iron-bearing material production development to substitute the sinter of high energy consumption high pollution.
The exploitation and development of high basicity pellet ore production technology facilitate energy-saving and emission-reduction, cost efficiency.Current domestic production Pellet be largely acidic pellet ore, the production of flux type pellet never has commercial scale, and only fraction enterprise is raw Produce the flux type pellet of low alkalinity.Flux type pellet is that CaO, MgO are added directly in ferrous material in balling process Equal fluxing agents, make it contain certain basicity, so as to improve the metallurgical performance of pellet.By long-term blast furnace process Approach Rope, the basicity CaO/SiO that China produces2=0.9-1.2, MgO=2.7-3.5% has reduction degree height, expansion rate Low, the good metallurgical performance such as reflowing temperature is high, reflowing temperature section is narrow.But due to MgO flux source is few, cost of material is high, Desulphurizing ability is poor, and needs to be added a certain amount of CaO in blast fumance with working the slag basicity, mobility, therefore general enterprises are not Use and produces addition flux as pelletizing containing magnesium raw material.Calcic raw material (predominantly CaO and CaCO3) from a wealth of sources, it is produced into This is cheap, but CaO can largely absorb water, and easily expand in drying and preheating or roasting process, pelletizing is caused to split, therefore is existing Low alkalinity pellet of the basicity between 0.9-1.2 is generally produced in technology using only CaO.And use CaCO3As flux When, the melting loss reaction of C can occur in blast furnace, accelerate the consumption of coke in furnace, therefore do not use CaCO in industry generally3As Pelletizing production flux.Therefore, new flux is sought, realizes that the production of superfluxed pellets is the mesh that ironmaking worker pursues Mark.
By patent retrieval, has relevant Pellet production method at present and disclose.Such as Chinese Patent Application No. CN201110275404.8 discloses a kind of method using gold tailing and limonite production acid pellet, oxygen in this application It is respectively 40%, 30% and that pellet production method is by the powder of gold tailing, limonite and magnetic iron ore by weight percentage 30% ratio mixing, is made green pellets, then preheats in drying grate, improves pelletizing explosion by extending green-ball preheating time Temperature improves pelletizing metallurgical performance, enters back into rotary kiln and form by a firing, cooling finally by ring cold machine, and acid pellet is made.It should Method uses gold tailing and has carried out waste utilization as one of raw material, and is controlled by temperature and slightly improve green pellet cracking Performance, but it is still acid pellet that it, which produces products obtained therefrom, does not improve basicity fundamentally, produces the self-fluxing nature of high alkalinity Pellet is of limited application.Number of patent application CN201410007020.1 discloses a kind of Titanium-rich pellet and its production method, The production method of Titanium-rich pellet is provided in this application, adds titaniferous materials, green-ball TiO in production process into raw material2Contain Amount is in 10-15%, and TFe is in 40-55%, and the Titanium-rich pellet of this application preparation is equally acid pellet, only in metallurgical performance Aspect is improved, and cannot inherently substitute the high basicity sinter of high energy consumption high pollution as blast furnace feeding primary raw material.
For another example, Chinese patent 201610027266.4 disclose it is a kind of using prepared from steel slag for the method for Basic Pellets and by Product made from this method, this application is by steel-making slag powder and Iron concentrate (12-30) in mass ratio: (70-88) mixes to obtain mixture, Then pelletizing, drying, preheating, roasting and ring cold treatment successively are carried out to get Basic Pellets to the mixture.This application Additive is used as using steel slag (i.e. vessel slag), since steel slag basicity is low, generally only between 1.0-3.0, and wherein contain S, the impurity contents such as P are high.Such as using need to largely be added, need to consume amount of heat, and blast furnace metallurgical coke scarcity of resources, price Height after addition a lot of steel slag enters pelletizing, consumes fuel, and production cost rises.Furthermore blast fumance is to S, P and alkali metal etc. Component requirements are high, and the addition of a lot of steel slag causes impurity element in furnace excessive, influences iron quality.Therefore, from production cost and It is not applicable to use steel slag as additive from the aspect of product quality.
Application No. is 201510447174.7 patents to disclose a kind of anti-stick Alkalinous pelletizing and its manufacturing method, prevents Bond the chemical component mass fraction of Alkalinous pelletizing are as follows: TFe:59~66 part;MgO:0.8~2.0 part;SiO2: 0.5~3.5 part; CaO/SiO2For 0.6-1.8.This application is by being incorporated binder, the additive of calcic into iron ore concentrate and containing the addition of magnesium Agent, surface treated, pelletizing, sintering obtain finished product anti-stick Alkalinous pelletizing.But due to adding 0.8-2.0% in Alkalinous pelletizing MgO, therefore substantially increase the big iron and steel enterprise's production cost of pellet feed amount, and its additives containing calcium is quick lime or life The mixture of lime and lime stone, after not solving quick lime (main component is CaO) water suction, the swelling cracking in roasting process The problem of, (main component is CaCO to the lime stone of addition3) it can also accelerate the melting loss of coke in blast furnace.
Application No. is 2006100012540 application cases to disclose a kind of producer of flux type iron ore powder composite pellet Method, this application, come the double basicity composite fluxing agent type pelletizings of production list ball, and are made for the first time using multiple pelletizing mode by controlling The amount of CaO and MgO during ball, so as to effectively control the dual alkalinity of pelletizing between 0.5-2.0.This application uses The production method of secondary pelletizing, to produce the qualified pelletizing of higher alkalisation, increase enterprise production capital construction cost and management at This, and a certain amount of MgO is added as raw material, increase blast-melted production cost.The stone being added when secondary pelletizing simultaneously Lime stone and dolomite decompose after entering blast furnace, with the coke gasification reaction in furnace, accelerate the melting loss of coke, destroy the stock column of coke Skeleton function, the gas permeability and the working of a furnace for being unfavorable for blast furnace are stablized.
In conclusion it is raw material that existing pelletizing production technique, which is all made of ferrous material,, preheating dry using green-ball, Roasting and cooling, progress pelletizing production, or improve pelletizing metallurgical performance with addition of a small amount of additive, the product produced is acid mostly Property pellet or low alkalinity pellet, cannot fundamentally change high basicity sinter with addition of acidic pellet ore, the furnace of lump ore Structure is expected, to not can be carried out effective solution to system energy consumption before iron existing for blast furnace iron-making process and problem of environmental pollution.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome that the high alkalinity met the requirements can not be produced using existing pelletizing production technique Pellet provides so as to cause blast furnace iron-making process there are the deficiency of system energy consumption and problem of environmental pollution before serious iron A kind of blast furnace ironmaking superfluxed pellets and its production method.It is able to produce to obtain high alkalinity using technical solution of the present invention Pellet, to solve deficiency existing for existing pelletizing production technique, and obtained pelletizing ingredient and quality comply fully with blast furnace The requirement of ironmaking.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of blast furnace ironmaking superfluxed pellets of the invention, the pellet are with concentrate powder, refining slag and bentonite For made of raw material, and the mass percent of each component is respectively as follows: concentrate powder 60-76%, refining slag 22-38%, bentonite 1.5-2.5%.
Further, the basicity of the pellet is 1.9-2.6, compression strength 3100-5000N.
Further, the mass fraction of TFe is 65-70%, CaO and SiO in the concentrate powder2Mass fraction difference For 1-1.5%, 3-3.3%;45-50% containing CaO in the refining slag contains SiO28-15%;Contain CaO in the bentonite 2-3% contains SiO268-70%.
The production method of blast furnace ironmaking superfluxed pellets of the invention, the superfluxed pellets be with concentrate powder, Refining slag and bentonite are raw material, are obtained through pelletizing, preheating and calcination process, specifically includes the following steps:
Step 1: raw material with addition of
It is dried after pelletizing raw material concentrate powder, refining slag and the bentonite of green-ball are ground into powder, then presses raw material Proportion ingredient is simultaneously uniformly mixed, and obtains mixture;
Step 2: pelletizing
Gained mixture progress pelletizing is obtained into green pellets, and filters out the qualified pelletizing that partial size is 10-16mm;
Step 3: green-ball preheats
It is dried at a temperature of the green pellets made first is placed in 100-200 DEG C, then drying time 7-10min is set It is preheated at a temperature of 500-1000 DEG C, preheating time 12-20min;
Step 4: green-ball roasts
Pelletizing after preheating is continued to heat up, is roasted at a temperature of 900-1300 DEG C, calcining time 25-40min, Then it is taken out after furnace cooling to get qualified superfluxed pellets is arrived.
Further, powder drying temperature is 90-110 DEG C in the step 1, drying time 2h.
Further, pelletizing processing is carried out using disc balling machine in the step 2, disc balling machine revolving speed is 6- 8rad/min, disk tilt angle are 45-48 °.
Further, the drop strength of gained pelletizing is 3-5 times in step 2, compression strength 7-11N.
Further, the drying, preheating of the pelletizing and roasting process carry out in electric furnace, and whole process passes through journey Sequence sets heating mode and completes.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) a kind of blast furnace ironmaking superfluxed pellets of the invention, is using concentrate powder, refining slag and bentonite as raw material Manufactured, the present invention, as one of raw material, can produce superfluxed pellets by using the refining slag rich in fluxing agent CaO, The pellet can substitute the high basicity sinter of high energy consumption high pollution as the main furnace charge of blast furnace, existing so as to be effectively improved System energy consumption and problem of environmental pollution before iron existing for Bf Burden.
(2) production method of a kind of blast furnace ironmaking superfluxed pellets of the invention, this method is with concentrate powder, refining slag It is raw material with bentonite, is able to produce to obtain superfluxed pellets through pelletizing, preheating and calcination process, passes through the original to pellet Material composition and ratio optimize, and the basicity of gained pellet is up to 2.0 or more, has broken in existing pelletizing production technology Technology of the qualified basicity no more than 1.0 recognizes, and so that superfluxed pellets is substituted high basicity sinter completely, is equipped with acid Property pellet, realize 100% pelletizing enter furnace, relative to existing Bf Burden, greatly reduce energy consumption and disposal of pollutants, save About production cost while reduce pollution, be effectively protected environment.
(3) production method of a kind of blast furnace ironmaking superfluxed pellets of the invention, by selecting refining slag as former One of material, and the basicity of the refining slag is high, S impurity content is low, remains basically stable with raw ore S content, to reduce the de- of blast furnace Sulphur burden, ensure that lower S content in molten iron, while being aided with the optimization of processing parameter, can effectively solve the problem that existing height Basicity pelletizing scissile problem in preheating and roasting, the pelletizing compression strength produced is big, S content is low, metallurgical performance is excellent It is good, it can effectively meet the technique requirement of blast furnace ironmaking.
(4) production method of a kind of blast furnace ironmaking superfluxed pellets of the invention, use concentrate powder and refining slag for Raw material, the waste refining slag for taking full advantage of refining process generation substantially reduce pelletizing to save pelletizing production raw material Production cost is of great significance for enterprise's cost efficiency;Waste utilization is carried out using refining slag as additive simultaneously, it is also real The internal consumption for having showed waste residue solves the stacking and pollution problem of waste, has saved waste residue land occupation and processing cost, and protect Environment is protected, therefore this method is suitable for popularization and application.
Detailed description of the invention
Fig. 1 is a kind of process flow diagram of the production method of blast furnace ironmaking superfluxed pellets of the invention.
Specific embodiment
For high energy consumption high pollution problem existing for existing " high basicity sinter+acidic pellet ore " Bf Burden, The PRODUCTION TRAITS of Basic Pellets at metallargist in recent years a research hotspot.All pass through mostly in the prior art The addition of CaO or MgO improves the alkalinity of pelletizing, but the source of MgO is relatively fewer, cost of material is high, and its desulphurizing ability compared with Difference;And when using alkalinity additive of the CaO as pellet, when its additive amount is more, then under the intensity of gained pelletizing is obvious Drop, and pelletizing easily splits in process of production, fails to be widely applied.Therefore, the Alkalinous pelletizing that prior art is produced The basicity of mine is relatively low, cannot be used to substitute the sinter of high energy consumption high pollution.In addition, the pressure resistance of existing Basic Pellets Spend it is relatively low, in blast furnace iron-making process easily occur rupture and dusting, with the raising of pellet basicity, this problem is just It is more serious.
The present invention is by using concentrate powder and refining slag as raw material, through the techniques such as compounding pelletizing, drying and preheating, roasting be cooling, And the composition to each raw material, mixed proportion and specific processing parameter optimize, it is high-alkali so as to produce to obtain The basicity of the pellet of degree, gained pellet is even as high as 2.0 or more, the alternative high energy consumption high pollution of the superfluxed pellets High basicity sinter greatly reduces energy consumption and disposal of pollutants as the main furnace charge of blast furnace, guarantor while having saved production cost Environment is protected, and obtained pelletizing ingredient and quality comply fully with requirement.Meanwhile it also significantly being mentioned using technical solution of the present invention The high compression strength of gained pellet, the S content of gained pellet is low, can effectively avoid that powder occurs during blast furnace ironmaking Change and fracture phenomena, and then can guarantee the smelting performance of gained molten iron.In addition, the present invention by control with addition of concentrate powder and Effective control to basicity can be realized in the mass fraction of refining slag, and basicity adjusts simple.
To further appreciate that the contents of the present invention, now in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
A kind of production method of blast furnace ironmaking superfluxed pellets of the present embodiment, process flow diagram such as Fig. 1 institute Show, the specific steps are that:
Step 1: raw material with addition of
Powder is made in pelletizing raw material concentrate powder, refining slag and the bentonite grinding of green-ball, the self-fluxing nature in the present embodiment Pelletizing is grouped as by the group of following mass percentage content: concentrate powder 71.8%, refining slag 26.2%, binder bentonite 2%, Wherein concentrate powder in the present embodiment, refining slag and bentonitic it is shown in Table shown in 1- table 3 at being grouped as.Mixture is placed in baking oven In, it is mixed after drying 2h at a temperature of 110 DEG C, until mixing is sufficiently, obtains mixture.
1 concentrate powder component list (%) of table
2 refining slag component list (%) of table
3 bentonite component list (%) of table
Step 2: green-ball is formed
By the mixture mixed well, pelletizing, disc balling machine revolving speed are 7rad/min on disc balling machine, and disk inclines Angle is 45 °, green pellets is made, and filter out partial size in the qualified pelletizing of 10-16mm, the average drop strength of gained pelletizing is 3.2 times, compression strength 8.21N.
Step 3: green-ball preheats
The green pellets made is placed in electric furnace, is dried at a temperature of 200 DEG C, drying time 8min, then Pelletizing is preheated at a temperature of 1000 DEG C, preheating time 12min.
Step 4: green-ball roasts
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is roasted at a temperature of 1200 DEG C, calcining time is 35min。
Step 5: pelletizing is cooling
To be taken out after pelletizing furnace cooling after roasting, after roasting pelletizing be superfluxed pellets, basicity 2.1, Compression strength is 4470N, obtains qualified high basicity pellet.
Embodiment 2
A kind of method using concentrate powder and refining slag production superfluxed pellets of the present embodiment, the specific steps are that:
Step 1: raw material with addition of
Powder is made in pelletizing raw material concentrate powder, refining slag and the bentonite grinding of green-ball, the self-fluxing nature in the present embodiment Pelletizing is grouped as by the group of following mass percentage content: concentrate powder 60.5%, refining slag 37.5%, binder bentonite 2%, Concentrate powder in the present embodiment, refining slag and bentonitic at being grouped as same embodiment 1.Mixture is placed in baking oven, at 110 DEG C At a temperature of dry 2h after mix, until mixing sufficiently, obtain mixture.
Step 2: green-ball is formed
By the mixture mixed well, pelletizing, disc balling machine revolving speed are 7rad/min on disc balling machine, and disk inclines Angle is 45 °, green pellets is made, and filter out partial size in the qualified pelletizing of 10-16mm, the average drop strength of gained pelletizing is 3.4 times, compression strength 10.01N.
Step 3: green-ball preheats
The green pellets made is placed in electric furnace, is dried at a temperature of 100 DEG C, drying time 8min, then 900 Pelletizing is preheated at a temperature of DEG C, preheating time 15min.
Step 4: green-ball roasts
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is roasted at a temperature of 1300 DEG C, calcining time is 25min。
Step 5: pelletizing is cooling
To be taken out after pelletizing furnace cooling after roasting, after roasting pelletizing be superfluxed pellets, basicity 2.6, Compression strength is 3160N, obtains qualified high basicity pellet.
Embodiment 3
A kind of method using concentrate powder and refining slag production superfluxed pellets of the present embodiment, the specific steps are that:
Step 1: raw material with addition of
Powder is made in pelletizing raw material concentrate powder, refining slag and the bentonite grinding of green-ball, the self-fluxing nature in the present embodiment Pelletizing is grouped as by the group of following mass percentage content: concentrate powder 76%, refining slag 22%, binder 2%, wherein concentrate Powder, refining slag and bentonitic it see the table below 4- table 6 at being grouped as.Mixture is placed in baking oven, dries 2h at a temperature of 90 DEG C After mix, until mixing sufficiently, obtain mixture.
4 concentrate powder component list (%) of table
5 refining slag component list (%) of table
6 bentonite component list (%) of table
Step 2: green-ball is formed
By the mixture mixed well, pelletizing, disc balling machine revolving speed are 6rad/min on disc balling machine, and disk inclines Angle is 48 °, and green pellets is made, and filters out partial size in the qualified pelletizing of 10-16mm, and the average drop strength of gained pelletizing is 5 It is secondary, compression strength 11N.
Step 3: green-ball preheats
The green pellets made is placed in electric furnace, is dried at a temperature of 175 DEG C, drying time 7min, then 500 Pelletizing is preheated at a temperature of DEG C, preheating time 20min.
Step 4: green-ball roasts
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is roasted at a temperature of 900 DEG C, calcining time 40min.
Step 5: pelletizing is cooling
To be taken out after pelletizing furnace cooling after roasting, after roasting pelletizing be superfluxed pellets, basicity 1.9, Compression strength is 3400N, obtains qualified high basicity pellet.
Embodiment 4
A kind of method using concentrate powder and refining slag production superfluxed pellets of the present embodiment, the specific steps are that:
Step 1: raw material with addition of
Powder is made in pelletizing raw material concentrate powder, refining slag and the bentonite grinding of green-ball, the self-fluxing nature in the present embodiment Pelletizing is grouped as by the group of following mass percentage content: concentrate powder 65%, refining slag 32.5%, binder 2.5%, wherein essence Miberal powder, refining slag and bentonitic it see the table below 7- table 9 at being grouped as.Mixture is placed in baking oven, is dried at a temperature of 103 DEG C It is mixed after 2h, until mixing is sufficiently, obtains mixture.
7 concentrate powder component list (%) of table
8 refining slag component list (%) of table
9 bentonite component list (%) of table
Step 2: green-ball is formed
By the mixture mixed well, pelletizing, disc balling machine revolving speed are 8rad/min on disc balling machine, and disk inclines Angle is 46 °, and green pellets is made, and filters out partial size in the qualified pelletizing of 10-16mm, and the average drop strength of gained pelletizing is 3 It is secondary, compression strength 7N.
Step 3: green-ball preheats
The green pellets made is placed in electric furnace, is dried at a temperature of 120 DEG C, drying time 10min, then Pelletizing is preheated at a temperature of 750 DEG C, preheating time 17min.
Step 4: green-ball roasts
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is roasted at a temperature of 1050 DEG C, calcining time is 30min。
Step 5: pelletizing is cooling
To be taken out after pelletizing furnace cooling after roasting, after roasting pelletizing be superfluxed pellets, basicity 2.4, Compression strength is 5000N, obtains qualified high basicity pellet.
Embodiment 5
A kind of method using concentrate powder and refining slag production superfluxed pellets of the present embodiment, the specific steps are that:
Step 1: raw material with addition of
Powder is made in pelletizing raw material concentrate powder, refining slag and the bentonite grinding of green-ball, the self-fluxing nature in the present embodiment Pelletizing is grouped as by the group of following mass percentage content: concentrate powder 63%, refining slag 35.5%, binder 1.5%, wherein essence The embodiment 4 of miberal powder, refining slag and bentonitic see the table below 10- table 11 at being grouped as.Mixture is placed in baking oven, at 98 DEG C At a temperature of dry 2h after mix, until mixing sufficiently, obtain mixture.
10 refining slag component list (%) of table
11 bentonite component list (%) of table
Step 2: green-ball is formed
By the mixture mixed well, pelletizing, disc balling machine revolving speed are 8rad/min on disc balling machine, and disk inclines Angle is 47 °, green pellets is made, and filter out partial size in the qualified pelletizing of 10-16mm, the average drop strength of gained pelletizing is 4.4 times, compression strength 10.5N.
Step 3: green-ball preheats
The green pellets made is placed in electric furnace, is dried at a temperature of 138 DEG C, drying time 9min, then 850 Pelletizing is preheated at a temperature of DEG C, preheating time 17min.
Step 4: green-ball roasts
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is roasted at a temperature of 1000 DEG C, calcining time is 25min。
Step 5: pelletizing is cooling
To be taken out after pelletizing furnace cooling after roasting, after roasting pelletizing be superfluxed pellets, basicity 2.2, Compression strength is 4200N, obtains qualified high basicity pellet.

Claims (7)

1. a kind of blast furnace ironmaking superfluxed pellets, it is characterised in that: the pellet is with concentrate powder, refining slag and bentonite For made of raw material, and the mass percent of each component is respectively as follows: concentrate powder 60-76%, refining slag 22-38%, bentonite 1.5-2.5%;The mass fraction of TFe is 65-70%, CaO and SiO in the concentrate powder2Mass fraction be respectively 1- 1.5%, 3-3.3%;Contain CaO45-50% in the refining slag, contains SiO28-15%;2-3% containing CaO in the bentonite, Containing SiO268-70%;The basicity of the pellet is 1.9-2.6, compression strength 3100-5000.
2. a kind of production method of blast furnace ironmaking superfluxed pellets as described in claim 1, it is characterised in that: the height Basicity pellet is to obtain using concentrate powder, refining slag and bentonite as raw material through pelletizing, preheating and calcination process.
3. a kind of production method of blast furnace ironmaking superfluxed pellets according to claim 2, which is characterized in that specific The following steps are included:
Step 1: raw material with addition of
It is dried after pelletizing raw material concentrate powder, refining slag and the bentonite of green-ball are ground into powder, then presses raw material proportioning Ingredient is simultaneously uniformly mixed, and obtains mixture;
Step 2: pelletizing
Gained mixture progress pelletizing is obtained into green pellets, and filters out the qualified pelletizing that partial size is 10-16mm;
Step 3: green-ball preheats
It is dried at a temperature of the green pellets made first is placed in 100-200 DEG C, drying time 7-10min is subsequently placed in It is preheated at a temperature of 500-1000 DEG C, preheating time 12-20min;
Step 4: green-ball roasts
Pelletizing after preheating is continued to heat up, is roasted at a temperature of 900-1300 DEG C, calcining time 25-40min, then It is taken out after furnace cooling to get qualified superfluxed pellets is arrived.
4. a kind of production method of blast furnace ironmaking superfluxed pellets according to claim 3, it is characterised in that: described Powder drying temperature is 90-110 DEG C in step 1, drying time 2h.
5. a kind of production method of blast furnace ironmaking superfluxed pellets according to claim 3, it is characterised in that: described Pelletizing processing is carried out using disc balling machine in step 2, disc balling machine revolving speed is 6-8rad/min, disk tilt angle 45- 48°。
6. a kind of production method of blast furnace ironmaking superfluxed pellets according to claim 5, it is characterised in that: step The drop strength of gained pelletizing is 3-5 times in two, compression strength 7-11N.
7. a kind of production method of blast furnace ironmaking superfluxed pellets according to any one of claim 3-6, special Sign is: drying, preheating and the roasting process of the pelletizing carry out in electric furnace.
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