CN107488784A - 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

Info

Publication number
CN107488784A
CN107488784A CN201710794596.0A CN201710794596A CN107488784A CN 107488784 A CN107488784 A CN 107488784A CN 201710794596 A CN201710794596 A CN 201710794596A CN 107488784 A CN107488784 A CN 107488784A
Authority
CN
China
Prior art keywords
pelletizing
superfluxed
pellets
blast furnace
green
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710794596.0A
Other languages
Chinese (zh)
Other versions
CN107488784B (en
Inventor
杨佳龙
杨建�
郭其飞
李家新
佘文文
杨乐彪
汪志鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui University of Technology AHUT
Original Assignee
Anhui University of Technology AHUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui University of Technology AHUT filed Critical Anhui University of Technology AHUT
Priority to CN201710794596.0A priority Critical patent/CN107488784B/en
Publication of CN107488784A publication Critical patent/CN107488784A/en
Application granted granted Critical
Publication of CN107488784B publication Critical patent/CN107488784B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a kind of blast furnace ironmaking superfluxed pellets and its production method, belong to technical field of ferrous metallurgy.A kind of blast furnace ironmaking superfluxed pellets of the present invention, the pellet are using fine ore, refining slag and bentonite as made of raw material, and the mass percent of each component is respectively：Fine ore 60 76%, refining slag 22 38%, bentonite 1.5 2.5%；The production method of the superfluxed pellets of the present invention, its step are：Raw material is formed with addition of, green-ball, green-ball preheating, green-ball roasting, pelletizing cool down.The present invention is using fine ore and refining slag as raw material, the qualified basicity produced is up to more than 2.0, 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 discarded object, energy resource consumption and disposal of pollutants are reduced while pelletizing production and Solid state fermentation cost is reduced, and the pelletizing compression strength produced is big, S contents are 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, is produced more specifically to one kind using fine ore and refining slag The method of superfluxed pellets.
Background technology
In steel production, BF-BOF flows are always in occupation of leading position, and blast furnace ironmaking is the main source of molten iron, Account for more than the 90% of total pig iron yield.Blast furnace ironmaking raw material mainly has iron ore, fuel, flux and air blast etc., China's blast furnace Burden structure is used based on high basicity sinter, the burden structure supplemented by acidic pellet ore and lump ore, is provided for blast furnace Iron-bearing material.The control of sintering deposit and pellet basicity is also beneficial to blast furnace slag making, ensures basicity of slag and mobility, beneficial to blast furnace Desulfurization and tap a blast furnace.But in whole steel produces BF-BOF flows, sintering process energy consumption accounts for 7.4%, pelletizing process accounting 1.2%；Environmental pollution caused by sintering process is also considerably beyond pelletizing process.The aggravation and environmental protection competed along with steel industry The increasingly increasing of pressure, cost efficiency, the environment-friendly mode of production are increasingly by the extensive concern of industry.Therefore, produce Superfluxed pellets, to substitute the sintering deposit of high energy consumption high pollution by as the new direction of following iron-bearing material production development.
The exploitation and development of high basicity pellet ore production technology contribute to 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, only fraction enterprise life Produce the flux type pellet of low alkalinity.Flux type pellet is in balling process, and CaO, MgO are added directly in ferrous material Deng fluxing agent, it is set to 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%, there is 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 add a certain amount of CaO in blast fumance with working the slag basicity, mobility, therefore general enterprises not Using containing magnesium raw material addition flux is produced as pelletizing.Calcic raw material (predominantly CaO and CaCO3) wide material sources, it is produced into This is cheap, but CaO can largely absorb water, and easily expanded in drying and preheating or roasting process, cause pelletizing to split, therefore existing Normally only low alkalinity pellet of the basicity between 0.9-1.2 is produced in technology using CaO.And use CaCO3As flux When, C melting loss reaction can occur in blast furnace, accelerate the consumption of coke in stove, therefore typically CaCO is not used in industry3As Pelletizing production flux.Therefore, new flux is sought, the production for realizing superfluxed pellets is the mesh that ironmaking worker pursues Mark.
By patent retrieval, have related Pellet production method at present and disclose.Such as Chinese Patent Application No. CN201110275404.8 discloses a kind of method that acid pellet is produced using gold tailing and limonite, oxygen in this application case It is respectively 40%, 30% and by weight percentage by the powder of gold tailing, limonite and magnetic iron ore that pellet production method, which is, 30% ratio mixing, is made green pellets, is then preheated in drying grate, and pelletizing explosion is improved by extending green-ball preheating time Temperature, improve pelletizing metallurgical performance, enter back into rotary kiln and form by a firing, cooled down finally by central cooler, acid pellet is made.Should Method employs gold tailing as one of raw material, has carried out twice laid, and slightly improve green pellet cracking by temperature control 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, it 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 case, adds titaniferous materials, green-ball TiO in production process into raw material2Contain Amount is in 10-15%, and TFe is in 40-55%, and Titanium-rich pellet prepared by this application case is equally acid pellet, simply in metallurgical performance Aspect is improved, it is impossible to inherently substitutes the high basicity sinter of high energy consumption high pollution as blast furnace feeding primary raw material.
And for 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 case is by steel-making slag powder and Iron concentrate (12-30) in mass ratio：(70-88) mixes to obtain compound, Then pelletizing, drying, preheating, roasting and ring cold treatment are carried out to the compound successively, produces Basic Pellets.This application case Additive is used as using slag (i.e. vessel slag), because slag basicity is low, typically only between 1.0-3.0, and wherein contain S, the impurity content such as P is high.Such as using need to largely add, it is necessary to consume amount of heat, and blast furnace metallurgical coke scarcity of resources, price Height, add big steel slag and rise into fuel, production cost after pelletizing, is consumed.In addition blast fumance is to S, P and alkali metal etc. Component requirements are high, and the addition of big steel slag causes impurity element in stove excessive, influences iron quality.Therefore, from production cost and It is inapplicable to use slag as additive from the aspect of product quality.
The patent of Application No. 201510447174.7 discloses a kind of anti-stick Alkalinous pelletizing and its manufacture method, and it is anti- Bond Alkalinous pelletizing chemical composition mass fraction be：TFe：59~66 parts；MgO：0.8~2.0 part；SiO2：0.5~3.5 part； CaO/SiO2For 0.6-1.8.This application case is by being incorporated binding agent, the additive of calcic and addition containing magnesium into iron ore concentrate 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.
The application case of Application No. 2006100012540 discloses a kind of producer of flux type iron ore powder composite pellet Method, this application case produces the double basicity composite fluxing agent type pelletizings of single ball using multiple pelletizing mode, and is made for the first time by controlling CaO and MgO amount during ball, so as to effectively control the dual alkalinity of pelletizing between 0.5-2.0.This application case uses The production method of secondary pelletizing, to produce the qualified pelletizing of higher alkalisation, add enterprise production capital construction cost and management into This, and a certain amount of MgO is added as raw material, add blast-melted production cost.The stone added simultaneously during secondary pelletizing Lime stone and dolomite decompose after entering blast furnace, and the coke gasification reaction in stove, accelerate the melting loss of coke, destroy the stock column of coke Skeleton function, gas permeability and the working of a furnace for being unfavorable for blast furnace are stable.
In summary, existing pelletizing production technique uses ferrous material as raw material, then by green-ball is dry, preheating, Roasting and cooling, pelletizing production is carried out, 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, it is impossible to fundamentally change high basicity sinter with addition of acidic pellet ore, the stove of lump ore Structure is expected, so as to can not effectively be solved to system energy consumption before iron existing for blast furnace iron-making process and problem of environmental pollution.
The content of the invention
1. invention technical problems to be solved
It is an object of the invention to overcome that the high alkalinity for being met requirement can not be produced using existing pelletizing production technique Pellet, so as to cause blast furnace iron-making process the deficiency of system energy consumption and problem of environmental pollution before serious iron to be present, there is provided A kind of blast furnace ironmaking superfluxed pellets and its production method.It can produce to obtain high alkalinity using technical scheme Pellet, it is insufficient existing for existing pelletizing production technique so as to solve, and obtained pelletizing composition and quality comply fully with blast furnace The requirement of ironmaking.
2. technical scheme
To reach above-mentioned purpose, technical scheme provided by the invention is：
A kind of blast furnace ironmaking superfluxed pellets of the present invention, the pellet is with fine ore, refining slag and bentonite For made of raw material, and the mass percent of each component is respectively：Fine ore 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, TFe mass fraction is 65-70%, CaO and SiO in the fine ore2Mass fraction difference For 1-1.5%, 3-3.3%；45-50% containing CaO in the refining slag, containing SiO28-15%；Contain CaO in the bentonite 2-3%, containing SiO268-70%.
The present invention blast furnace ironmaking superfluxed pellets production method, the superfluxed pellets be with fine ore, Refining slag and bentonite are raw material, are obtained through pelletizing, preheating and calcination process, specifically include following steps：
Step 1: raw material with addition of
Dried after pelletizing raw material fine ore, refining slag and the bentonite of green-ball are ground into powder, then by raw material Proportion ingredient is simultaneously well mixed, and obtains compound；
Step 2: pelletizing
Gained compound progress pelletizing is obtained into green pellets, and filters out the qualified pelletizing that particle diameter is 10-16mm；
Step 3: green-ball preheats
It is dried, drying time 7-10min, then puts at a temperature of the green pellets made first is placed in into 100-200 DEG C Preheated at a temperature of 500-1000 DEG C, preheating time 12-20min；
Step 4: green-ball is calcined
Pelletizing after preheating is continued to heat up, is calcined at a temperature of 900-1300 DEG C, roasting time 25-40min, Then taken out after furnace cooling, that is, obtain qualified superfluxed pellets.
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 rotating 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, drying, preheating and the roasting process of the pelletizing are carried out in electric furnace, and whole process passes through journey Sequence setting heating mode is completed.
3. beneficial effect
Using technical scheme 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 fine ore, 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 fine ore, refining slag It is raw material with bentonite, can produces to obtain superfluxed pellets through pelletizing, preheating and calcination process, pass through the original to pellet Material composition and ratio optimize design, and the basicity of gained pellet is up to more than 2.0, has broken in existing pelletizing production technology Technology of the qualified basicity no more than 1.0 recognizes, and superfluxed pellets is substituted high basicity sinter completely, is equipped with acid Property pellet, realize that 100% pelletizing enters stove, 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 being used as original from refining slag One of material, and the basicity of the refining slag is high, S impurity contents are low, is remained basically stable with raw ore S contents, so as to reduce the de- of blast furnace Sulphur is born, and ensure that S contents relatively low in molten iron, while is 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 contents are low, metallurgical performance is excellent It is good, it can effectively meet the technological requirement of blast furnace ironmaking.
(4) production method of a kind of blast furnace ironmaking superfluxed pellets of the invention, use fine ore and refining slag for Raw material, discarded object refining slag caused by refining process is taken full advantage of, so as to save pelletizing production raw material, substantially reduce pelletizing Production cost, it is significant for enterprise's cost efficiency；Twice laid is carried out using refining slag as additive simultaneously, it is also real Show the internal consumption of waste residue, the stacking and pollution problem for solving discarded object, save waste residue occupation of land and processing cost, and protect Environment is protected, therefore this method is suitable to popularization and application.
Brief description of the drawings
Fig. 1 is a kind of process flow diagram of the production method of blast furnace ironmaking superfluxed pellets of the present invention.
Embodiment
For existing " high basicity sinter+acidic pellet ore " high energy consumption high pollution problem existing for Bf Burden, A study hotspot of the PRODUCTION TRAITS of Basic Pellets into metallargist in recent years.All pass through mostly in the prior art CaO or MgO addition improves the alkalescence of pelletizing, but MgO source is relatively fewer, cost of material is high, and its desulphurizing ability compared with Difference；And when using alkalinity additives of the CaO as pellet, when its addition 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 existing process is produced The basicity of ore deposit is relatively low, it is impossible to for substituting the sintering deposit 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 efflorescence, with the raising of pellet basicity, this problem is just It is more serious.
The present invention is by using fine ore and refining slag as raw material, through being compounded the techniques such as pelletizing, drying and preheating, roasting cooling, It is high-alkali so as to produce to obtain and the composition to each raw material, mixed proportion and specific processing parameter optimize design The pellet of degree, the basicity of gained pellet are even as high as more than 2.0, the alternative high energy consumption high pollution of the superfluxed pellets High basicity sinter greatly reduces energy consumption and disposal of pollutants, protected while having saved production cost as the main furnace charge of blast furnace Environment is protected, and obtained pelletizing composition and quality comply fully with requirement.Meanwhile also significantly carried using technical scheme The high compression strength of gained pellet, the S contents of gained pellet are low, can effectively avoid that powder occurs during blast furnace ironmaking Change and fracture phenomena, and then the smelting performance of gained molten iron can be ensured.In addition, the present invention by control with addition of fine ore and The mass fraction of refining slag is that effective control to basicity can be achieved, and basicity regulation is simple.
To further appreciate that present disclosure, 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, its process flow diagram such as Fig. 1 institutes Show, it is concretely comprised the following steps：
Step 1: raw material with addition of
The pelletizing raw material fine ore, refining slag and bentonite of green-ball are ground powder is made, the self-fluxing nature in the present embodiment Pelletizing is made up of the component of following mass percentage content：Fine ore 71.8%, refining slag 26.2%, binding agent bentonite 2%, Fine ore, refining slag and bentonitic composition composition are shown in Table shown in 1- tables 3 wherein in the present embodiment.Compound is placed in baking oven In, mixed after drying 2h at a temperature of 110 DEG C, until mixing is abundant, obtain compound.
The fine ore component list (%) of table 1
The refining slag component list (%) of table 2
The bentonite component list (%) of table 3
Step 2: green-ball is formed
By the compound fully mixed, pelletizing, disc balling machine rotating speed are 7rad/min on disc balling machine, and disk inclines Angle is 45 °, and green pellets is made, and filters out qualified pelletizing of the particle diameter in 10-16mm, and 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 is calcined
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is calcined at a temperature of 1200 DEG C, roasting time is 35min。
Step 5: pelletizing cools down
To be taken out after pelletizing furnace cooling after roasting, pelletizing is superfluxed pellets after roasting, basicity 2.1, Compression strength is 4470N, obtains qualified high basicity pellet.
Embodiment 2
A kind of method for producing superfluxed pellets using fine ore and refining slag of the present embodiment, it is concretely comprised the following steps：
Step 1: raw material with addition of
The pelletizing raw material fine ore, refining slag and bentonite of green-ball are ground powder is made, the self-fluxing nature in the present embodiment Pelletizing is made up of the component of following mass percentage content：Fine ore 60.5%, refining slag 37.5%, binding agent bentonite 2%, Fine ore, refining slag and bentonitic composition composition are the same as embodiment 1 in the present embodiment.Compound is placed in baking oven, at 110 DEG C At a temperature of dry 2h after mix, until mixing is abundant, obtain compound.
Step 2: green-ball is formed
By the compound fully mixed, pelletizing, disc balling machine rotating speed are 7rad/min on disc balling machine, and disk inclines Angle is 45 °, and green pellets is made, and filters out qualified pelletizing of the particle diameter in 10-16mm, and 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 is calcined
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is calcined at a temperature of 1300 DEG C, roasting time is 25min。
Step 5: pelletizing cools down
To be taken out after pelletizing furnace cooling after roasting, pelletizing is superfluxed pellets after roasting, basicity 2.6, Compression strength is 3160N, obtains qualified high basicity pellet.
Embodiment 3
A kind of method for producing superfluxed pellets using fine ore and refining slag of the present embodiment, it is concretely comprised the following steps：
Step 1: raw material with addition of
The pelletizing raw material fine ore, refining slag and bentonite of green-ball are ground powder is made, the self-fluxing nature in the present embodiment Pelletizing is made up of the component of following mass percentage content：Fine ore 76%, refining slag 22%, wherein binding agent 2%, concentrate Powder, refining slag and bentonitic composition composition see the table below 4- tables 6.Compound is placed in baking oven, 2h is dried at a temperature of 90 DEG C After mix, until mixing is abundant, obtain compound.
The fine ore component list (%) of table 4
The refining slag component list (%) of table 5
The bentonite component list (%) of table 6
Step 2: green-ball is formed
By the compound fully mixed, pelletizing, disc balling machine rotating speed are 6rad/min on disc balling machine, and disk inclines Angle is 48 °, and green pellets is made, and filters out qualified pelletizing of the particle diameter in 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 is calcined
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is calcined at a temperature of 900 DEG C, roasting time 40min.
Step 5: pelletizing cools down
To be taken out after pelletizing furnace cooling after roasting, pelletizing is superfluxed pellets after roasting, basicity 1.9, Compression strength is 3400N, obtains qualified high basicity pellet.
Embodiment 4
A kind of method for producing superfluxed pellets using fine ore and refining slag of the present embodiment, it is concretely comprised the following steps：
Step 1: raw material with addition of
The pelletizing raw material fine ore, refining slag and bentonite of green-ball are ground powder is made, the self-fluxing nature in the present embodiment Pelletizing is made up of the component of following mass percentage content：Fine ore 65%, refining slag 32.5%, binding agent 2.5%, wherein essence Miberal powder, refining slag and bentonitic composition composition see the table below 7- tables 9.Compound is placed in baking oven, dried at a temperature of 103 DEG C Mixed after 2h, until mixing is abundant, obtain compound.
The fine ore component list (%) of table 7
The refining slag component list (%) of table 8
The bentonite component list (%) of table 9
Step 2: green-ball is formed
By the compound fully mixed, pelletizing, disc balling machine rotating speed are 8rad/min on disc balling machine, and disk inclines Angle is 46 °, and green pellets is made, and filters out qualified pelletizing of the particle diameter in 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 is calcined
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is calcined at a temperature of 1050 DEG C, roasting time is 30min。
Step 5: pelletizing cools down
To be taken out after pelletizing furnace cooling after roasting, pelletizing is superfluxed pellets after roasting, basicity 2.4, Compression strength is 5000N, obtains qualified high basicity pellet.
Embodiment 5
A kind of method for producing superfluxed pellets using fine ore and refining slag of the present embodiment, it is concretely comprised the following steps：
Step 1: raw material with addition of
The pelletizing raw material fine ore, refining slag and bentonite of green-ball are ground powder is made, the self-fluxing nature in the present embodiment Pelletizing is made up of the component of following mass percentage content：Fine ore 63%, refining slag 35.5%, binding agent 1.5%, wherein essence The embodiment 4 of miberal powder, refining slag and bentonitic composition composition see the table below 10- tables 11.Compound is placed in baking oven, at 98 DEG C At a temperature of dry 2h after mix, until mixing is abundant, obtain compound.
The refining slag component list (%) of table 10
The bentonite component list (%) of table 11
Step 2: green-ball is formed
By the compound fully mixed, pelletizing, disc balling machine rotating speed are 8rad/min on disc balling machine, and disk inclines Angle is 47 °, and green pellets is made, and filters out qualified pelletizing of the particle diameter in 10-16mm, and 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 is calcined
Pelletizing after preheating is relayed into temperature of continuing rising in electric furnace, is calcined at a temperature of 1000 DEG C, roasting time is 25min。
Step 5: pelletizing cools down
To be taken out after pelletizing furnace cooling after roasting, pelletizing is superfluxed pellets after roasting, basicity 2.2, Compression strength is 4200N, obtains qualified high basicity pellet.

Claims (9)

  1. A kind of 1. blast furnace ironmaking superfluxed pellets, it is characterised in that：The pellet is with fine ore, refining slag and bentonite For made of raw material, and the mass percent of each component is respectively：Fine ore 60-76%, refining slag 22-38%, bentonite 1.5-2.5%.
  2. A kind of 2. blast furnace ironmaking superfluxed pellets according to claim 1, it is characterised in that：The basicity of the pellet For 1.9-2.6, compression strength 3100-5000.
  3. A kind of 3. blast furnace ironmaking superfluxed pellets according to claim 1, it is characterised in that：In the fine ore TFe mass fraction is 65-70%, CaO and SiO2Mass fraction be respectively 1-1.5%, 3-3.3%；In the refining slag Containing CaO45-50%, containing SiO28-15%；2-3% containing CaO in the bentonite, containing SiO268-70%.
  4. 4. a kind of production method of blast furnace ironmaking superfluxed pellets as any one of claim 1-3, its feature It is：The superfluxed pellets is using fine ore, refining slag and bentonite as raw material, is obtained through pelletizing, preheating and calcination process Arrive.
  5. 5. the production method of a kind of blast furnace ironmaking superfluxed pellets according to claim 4, it is characterised in that specific Comprise the following steps：
    Step 1: raw material with addition of
    Dried after pelletizing raw material fine ore, refining slag and the bentonite of green-ball are ground into powder, then by raw material proportioning Dispensing is simultaneously well mixed, and obtains compound；
    Step 2: pelletizing
    Gained compound progress pelletizing is obtained into green pellets, and filters out the qualified pelletizing that particle diameter is 10-16mm；
    Step 3: green-ball preheats
    It is dried, drying time 7-10min, is subsequently placed at a temperature of the green pellets made first is placed in into 100-200 DEG C Preheated at a temperature of 500-1000 DEG C, preheating time 12-20min；
    Step 4: green-ball is calcined
    Pelletizing after preheating is continued to heat up, is calcined at a temperature of 900-1300 DEG C, roasting time 25-40min, then Taken out after furnace cooling, that is, obtain qualified superfluxed pellets.
  6. A kind of 6. production method of blast furnace ironmaking superfluxed pellets according to claim 5, it is characterised in that：It is described Powder drying temperature is 90-110 DEG C in step 1, drying time 2h.
  7. A kind of 7. production method of blast furnace ironmaking superfluxed pellets according to claim 5, it is characterised in that：It is described Pelletizing processing is carried out using disc balling machine in step 2, disc balling machine rotating speed is 6-8rad/min, disk tilt angle 45- 48°。
  8. A kind of 8. production method of blast furnace ironmaking superfluxed pellets according to claim 7, it is characterised in that：Step The drop strength of gained pelletizing is 3-5 times in two, compression strength 7-11N.
  9. 9. a kind of production method of blast furnace ironmaking superfluxed pellets according to any one of claim 5-8, it is special Sign is：Drying, preheating and the roasting process of the pelletizing are carried out in electric furnace.
CN201710794596.0A 2017-09-06 2017-09-06 A kind of blast furnace ironmaking superfluxed pellets and its production method Active CN107488784B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710794596.0A CN107488784B (en) 2017-09-06 2017-09-06 A kind of blast furnace ironmaking superfluxed pellets and its production method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710794596.0A CN107488784B (en) 2017-09-06 2017-09-06 A kind of blast furnace ironmaking superfluxed pellets and its production method

Publications (2)

Publication Number Publication Date
CN107488784A true CN107488784A (en) 2017-12-19
CN107488784B CN107488784B (en) 2019-07-26

Family

ID=60652241

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710794596.0A Active CN107488784B (en) 2017-09-06 2017-09-06 A kind of blast furnace ironmaking superfluxed pellets and its production method

Country Status (1)

Country Link
CN (1) CN107488784B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109161678A (en) * 2018-09-30 2019-01-08 四川德胜集团钒钛有限公司 A kind of ameliorative Basic Pellets and preparation method thereof
CN112226558A (en) * 2020-10-12 2021-01-15 王玉平 Blast furnace iron-smelting method using high-proportion alkaline pellets and pellet distributing machine
CN112342374A (en) * 2020-11-06 2021-02-09 建龙西林钢铁有限公司 Method for producing pellet ore by using low-moisture mineral powder
CN114410960A (en) * 2021-12-17 2022-04-29 萍乡市众邦冶金有限公司 Pelletizing production process for steel smelting

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1064107A (en) * 1992-03-25 1992-09-02 冶金工业部钢铁研究总院 Method for preparing pellet sintered ore
JP2755042B2 (en) * 1992-05-15 1998-05-20 日本鋼管株式会社 Method for producing calcined agglomerate
CN1199100A (en) * 1997-05-08 1998-11-18 王瑞安 Pellet producing method using ferrous oxide steel slag
CN1203954A (en) * 1998-04-29 1999-01-06 宝山钢铁(集团)公司 Production method of direct reduction shaft and blast furnace cold-bonded pellet
CN1580297A (en) * 2003-08-08 2005-02-16 王秋森 Basic pellet calcinating process
CN1804058A (en) * 2006-01-10 2006-07-19 许贵宾 Method for making fluxed iron ore powder composite pellet
CN105274329A (en) * 2015-10-05 2016-01-27 杭州碧清环保科技有限公司 Pellet manufactured through multiple metal smelting waste and preparing method of pellet
CN105567954A (en) * 2016-01-15 2016-05-11 张学军 Method for preparing alkaline pellets through steel slag and product prepared with method
CN106119524A (en) * 2016-08-04 2016-11-16 河钢股份有限公司 A kind of low silicon height magnesioferrite pelletizing preparation method
CN106435170A (en) * 2016-09-30 2017-02-22 首钢总公司 Method and mineral powder mixture for preparing alkaline pellets

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1064107A (en) * 1992-03-25 1992-09-02 冶金工业部钢铁研究总院 Method for preparing pellet sintered ore
JP2755042B2 (en) * 1992-05-15 1998-05-20 日本鋼管株式会社 Method for producing calcined agglomerate
CN1199100A (en) * 1997-05-08 1998-11-18 王瑞安 Pellet producing method using ferrous oxide steel slag
CN1203954A (en) * 1998-04-29 1999-01-06 宝山钢铁(集团)公司 Production method of direct reduction shaft and blast furnace cold-bonded pellet
CN1580297A (en) * 2003-08-08 2005-02-16 王秋森 Basic pellet calcinating process
CN1804058A (en) * 2006-01-10 2006-07-19 许贵宾 Method for making fluxed iron ore powder composite pellet
CN105274329A (en) * 2015-10-05 2016-01-27 杭州碧清环保科技有限公司 Pellet manufactured through multiple metal smelting waste and preparing method of pellet
CN105567954A (en) * 2016-01-15 2016-05-11 张学军 Method for preparing alkaline pellets through steel slag and product prepared with method
CN106119524A (en) * 2016-08-04 2016-11-16 河钢股份有限公司 A kind of low silicon height magnesioferrite pelletizing preparation method
CN106435170A (en) * 2016-09-30 2017-02-22 首钢总公司 Method and mineral powder mixture for preparing alkaline pellets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
吴明立等: "固体废弃物在竖炉球团生产中的应用", 《山东冶金》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109161678A (en) * 2018-09-30 2019-01-08 四川德胜集团钒钛有限公司 A kind of ameliorative Basic Pellets and preparation method thereof
CN112226558A (en) * 2020-10-12 2021-01-15 王玉平 Blast furnace iron-smelting method using high-proportion alkaline pellets and pellet distributing machine
CN112342374A (en) * 2020-11-06 2021-02-09 建龙西林钢铁有限公司 Method for producing pellet ore by using low-moisture mineral powder
CN112342374B (en) * 2020-11-06 2022-04-01 建龙西林钢铁有限公司 Method for producing pellet ore by using low-moisture mineral powder
CN114410960A (en) * 2021-12-17 2022-04-29 萍乡市众邦冶金有限公司 Pelletizing production process for steel smelting
CN114410960B (en) * 2021-12-17 2023-12-12 萍乡市众邦冶金有限公司 Pellet production process for steel smelting

Also Published As

Publication number Publication date
CN107488784B (en) 2019-07-26

Similar Documents

Publication Publication Date Title
CN106191344B (en) A kind of method for mixing the production of slag melting and reducing and modifier treatment
CN106048109B (en) A kind of method for mixing the recycling of slag melting and reducing and modifier treatment
CN102534199B (en) Comprehensive utilization process of zinc-containing iron dust
CN103468961B (en) A kind of airtight cupola furnace process Steel Plant are containing zinc, lead powder dirt processing method
CN104480299B (en) Method for preparing sintered ores by adding waste slag to chromium-containing-type vanadium-titanium magnetite concentrates
CN106755656A (en) A kind of method that slag metallurgy one-step method is reclaimed
CN100348744C (en) Iron ore pellet and its preparation method
CN104975173B (en) Production method of fluxed composite carbon-containing pellets used in blast furnace
CN107488784B (en) A kind of blast furnace ironmaking superfluxed pellets and its production method
CN104894322B (en) The method and its device of a kind of multilayer slag fused reduction iron-smelting
CN101144110A (en) Method for directly producing ferrochromium from chrome ore powder and coal
CN104862441A (en) Method for separating and recovering iron, vanadium and titanium in vanadium-titanium magnetite
CN106755652A (en) A kind of method that titanium-containing slag metallurgy one-step method is reclaimed
CN103146913B (en) Method for treating iron-containing dust of iron and steel plant by using cupola furnace
CN104357657A (en) Method for preparing oxidized pellets from converter dedusting ash
CN103451451A (en) Ferro-nickel alloy production technology with laterite nickel ore processed through oxygen enrichment hot air shaft furnace
CN108950189A (en) A method of sinter containing MgO is produced using waste magnesia carbon bricks
CN106119532A (en) Process the method and system of red mud
CN104328242A (en) Steelmaking method of high-phosphorus molten iron containing vanadium-titanium
CN108774683B (en) A kind of high magnesium composite sinter and its production method
CN106282453A (en) A kind of method of sefstromite blast furnace process
CN109652643A (en) High quality sinter and preparation method thereof for COREX ironmaking technique of fusion and reduction
CN108070713A (en) A kind of iron ore sintering method using calcined magnesite ball
CN106755658A (en) A kind of method of the metallurgical also original production of titanium-containing slag
CN106755653A (en) A kind of method containing rare earth or the also original production of niobium slag metallurgy melting

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant