CN101613800B - Metallurgical composite pelletizing prepared through twice pelletizing method, as well as preparation method and application thereof - Google Patents
Metallurgical composite pelletizing prepared through twice pelletizing method, as well as preparation method and application thereof Download PDFInfo
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Abstract
本发明提出一种采用两次成球方式制作形成的冶金复合球团制备方法及应用，球团由中心的球团核和外面裹覆的球团矿原料形成球壳，形成内部球团核为还原性气氛、外部为氧化性气氛满足冶炼要求的两次成球冶金复合球团。球团核是以含铁物料和还原煤粉或焦粉为原料另加粘接剂、垃圾飞灰采用圆盘造球或压力造球而获得，球壳是以含铁物料和球团核为原料，另加粘接剂，以球团核为球心采用圆盘造球而获得。该复合球团的各项冶金性能指标大大优于常规球团矿，在实现垃圾飞灰无害化，再生循环利用的同时还将大大改善炼铁高炉技术经济指标，在取得显著节能减排环保治理社会效益的同时也将创造出非常可观的经济效益。The present invention proposes a preparation method and application of metallurgical composite pellets formed by two-time pelletization. The pellets form a spherical shell from the pellet core in the center and pellet raw materials coated on the outside, and the inner pellet core is formed as follows: The reducing atmosphere and the external oxidizing atmosphere meet the requirements of smelting, and the metallurgical composite pellets are pelletized twice. The pellet core is obtained by iron-containing material and reduced coal powder or coke powder as raw materials plus a binder, and the garbage fly ash is obtained by disc pelletizing or pressure pelletizing, and the spherical shell is obtained by iron-containing material and pellet core. Raw materials, plus binder, are obtained by making pellets with a disc as the center. The metallurgical performance indicators of the composite pellets are much better than conventional pellets. While realizing the harmlessness of garbage fly ash, regeneration and recycling, it will also greatly improve the technical and economic indicators of ironmaking blast furnaces, and achieve significant energy saving, emission reduction and environmental protection. While governing social benefits, it will also create very considerable economic benefits.
Description
Technical field
The invention belongs to metallurgical iron-making and steel-making technology and technology of garbage disposal field, be specifically related to the high-quality steel scrap of the pellet of metallurgical ironmaking and agglomerate production, steel-making and slag former production and, can when improving metallurgical performance, realize carrying out innoxious pre-treatment garbage flying ash to the preconditioning technique of garbage flying ash.
Background technology
Metallurgical briquetting is present iron and steel metallurgical industry blast furnace---the up-to-date mature technology that extensively adopts in the converter Production Flow Chart, it is one of topmost raw material of blast-furnace smelting, compare with traditional agglomerate, be applicable to all thin concentrate, its intensity height, viscosity is even, of high grade and Well-recovered, metallurgical performance substantially exceeds agglomerate, can improve the every technico-economical comparison of blast-furnace smelting comprehensively, waste gas and dust discharge amount also are better than agglomerate, and environmental benefit is very obvious.But also exist some shortcomings, have contradictory phenomena as its reductibility and its blast furnace reduction intensity, conventional metallurgical briquetting ore deposit is without any reduction; Its facility investment is higher than agglomerate; Its ingredient requirement more sternly causes cost higher etc., and these have restricted the development of pellet, make its use proportioning in blast furnace burden be subjected to bigger restriction.
Metallurgy sintered ore deposit is present iron and steel metallurgical industry blast furnace---the mature technology that extensively adopts in the Production Flow Chart, be the topmost raw material of blast-furnace smelting, compare that it is not harsh to ingredient requirement with pellet, the scope of application is very wide, and the initial cost equipment making is lower than pellet.But its grade is lower, the insufficient strength height, and reductibility is not high, the size composition inequality, the higher batching that causes of gas permeability requirements requires accurately, and bigger at the production process smoke discharge amount, and detrimental impurity element such as S content are higher, and the environment protection treating difficulty is bigger.
Converter steelmaking is the main mode of production of present iron and steel metallurgical industry, can produce most steel products with economic way, but one of its main raw material---steel scrap derives from society and reclaims, of a great variety, quality status is uneven, not only quantity is difficult for stable, and various harmful element foreign matter content fluctuations can't be measured more greatly, as use refining unit then certainly will increase cost greatly, cause sizable difficulty for the production of high cleanliness steel product, the used slag former of steelmaking slagging process can not increase the molten steel amount, and the output of steel is increased.
Electric furnace steel making is to be only second to blast furnace in the present iron and steel metallurgical industry---the main mode of converter Production Flow Chart, the steel demand of every profession and trade leading-edge field and key equipment key part is satisfied in the production that is widely used in special high-quality steel, be blast furnace---converter Production Flow Chart one important supplement, but its main raw material---steel scrap comes from society to be reclaimed, not only quantity is difficult to stablize, and quality status is difficult to stable the assurance, various detrimental impurity quantity are many again, it is big again to fluctuate, be difficult to before putting into production use detect, and investment such as operation adjustment means limited removal foreign matter content required equipment such as VD vacuum-treat is huge in the EAF Steelmaking Process, and production cost is higher.
Garbage flying ash produces in incineration treatment of garbage, and the main component of garbage flying ash has CaO, SiO
2, Al
2O
3, SO
3Deng, wherein contain the heavy metal Pb, Cd, Hg, Cr, Cu, Zn of higher concentration etc., also have dioxin, so garbage flying ash is the material that enters national hazardous material catalogue, must just can prevent its pollution through effective processing of strictness to environment.Relatively the garbage flying ash treatment process of safety has three kinds at present: 1, coagulating cement solidification treatment---landfill; 2, chemical agent is handled---landfill; 3, melting treatment---regeneration, and melting treatment---regeneration method is advanced treatment process.
Wherein, melting treatment---the regeneration method is divided into two classes again: a class is high temperature oxidation atmosphere melting treatment method (as: electric furnace, shaft furnace, sintering oven, a rotary kiln etc., the most problems that can the treating refuse flying dust exist, but there are serious problems, when melt temperature more than 800 ℃ the time, trivalent chromium in the heavy metal can all change into Liu Jia Chrome, and this is unallowable serious problems); Another kind of is high temperature reduction atmosphere melting treatment method.Now existing a large amount of studies show that, melting treatment can thoroughly be eliminated De dioxin in the flying dust, contained lower boiling heavy metal salt is transferred in the air and is captured with the form of fusion flying dust in the flying dust, all the other metals are then transferred in the glass slag, greatly reduce the leaching characteristic of heavy metal, (referring to document 1: environmental engineering system of Beijing University of Chemical Technology, China Environmental Science Research Institute: Jiang Yonghai, the seat Big Dipper, Li Xiujin, Wang Qi, Zhang Xiaoxuan " incineration of refuse flyash melting and solidification treating processes specificity analysis "; Document 2: Harbin Institute of Technology's energy science and engineering college: other Ru Shan, Liu Huanpeng " incineration of refuse flyash cyclone furnace high-temperature fusion is handled and the regeneration new technology "; Document 3: Zhejiang University: Li Jianxin, Yan Jianhua, Ni Mingjiang, Cen Kefa " heavy metal stabilization is handled in the incineration of refuse flyash ").
But; adopt high temperature oxidation atmosphere melting treatment; when melt temperature more than 800 ℃ the time; trivalent chromium in the heavy metal can all change into Liu Jia Chrome, and Liu Jia Chrome is the property swallowed poisonous substance/imbedibility utmost point poisonous substance, and skin contact may cause sensitivity; more may cause the heredity genetic flaw; sucking may be carcinogenic, and environment is had lasting danger, all disapproves existence in this environmental protection standard at home and abroad.
And adopt high temperature reduction atmosphere scorification can effectively avoid this problem, but present high temperature reduction atmosphere scorification both domestic and external all is to adopt special high temperature reduction atmosphere fusion apparatus, as the melt surface stove, the electric arc melting stove, the plasma fusion stove, cyclone furnaces etc., the construction and the running cost of these equipment are high, are difficult to carry out industrialized implementation.
Summary of the invention
The objective of the invention is to deficiency, propose a kind of twice balling-up mode and make metallurgical composite pellet and preparation method thereof at the prior art existence.
Technical scheme of the present invention is as follows:
Twice balling-up mode of a kind of employing made the metallurgical composite pellet of formation, it is made up of the pellet raw material that the pelletizing nuclear and the outside at center wrap, and forms inner pelletizing nuclear and is reducing atmosphere, the outside metallurgical composite pellet of twice balling-up that satisfies smelting requirements for oxidizing atmosphere.Described pelletizing nuclear is to be that raw material adds caking agent in addition and adopts disk to make ball or pressure to make ball and obtain the diameter 2-10mm of pelletizing nuclear with ferrous material and reduction coal dust; The pellet raw material spherical shell that described outside wraps is to be raw material with ferrous material and pelletizing nuclear, and other adds caking agent, is that the centre of sphere adopts disk to make ball to obtain with pelletizing nuclear.
This metallurgy composite briquette ore making method is with ferrous material and reduction coal dust or further adds garbage flying ash mixing formation pelletizing nuclear, enter the production process of conventional pellet then---make ball with ferrous material once more and form composite pellet, the production technique of pellet formation pellet nuclear is reducing atmosphere routinely, skin is the roasting process of oxidizing atmosphere, reach the innoxious pre-treatment of garbage flying ash, form the high quality raw material when sending into behind the quality pellets ore deposit that part is reduced in the iron-smelting blast furnace, reach and handle and the purpose of regeneration thereby the pre-treatment of finishing garbage flying ash improves metallurgical performance as blast furnace ironmaking.
The concrete steps of described method are as follows:
(1) makes pelletizing nuclear
The ferrous material of described making pelletizing nuclear, reduction coal dust and/or both weight percents of coke powder person are respectively 60-95%, 5-40%, and the consumption of caking agent is as the criterion to reach bonding purpose, is generally the 1-4% of material quantity.Raw material is a powdery, and fineness is at-80--200 order.
A, elder generation carry out drying to raw material, make its moisture be no more than 15%;
B, batching: raw material and caking agent are fully stirred, mix by stirrer;
C, group's ball: the raw material and the caking agent that mix are delivered to balling disc, add behind the water at disk
Roll into a ball into the pelletizing nuclear of diameter 2-10mm in the pelletizer;
(2) make composite pellet
With pelletizing nuclear is the centre of sphere, and ferrous material is a raw material, adding additives in addition, and the consumption of caking agent is as the criterion to reach bonding purpose, is generally the 1-4% of material quantity.Raw material is a powdery, and fineness is at-80--200 order;
A. pelletizing nuclear and ferrous material are sent into and produced with pelletizing nuclear in the balling disc to be the centre of sphere, to cover the composite pellet green-ball of ferrous material outward, and screen out particle; The volume ratio of control pelletizing nuclear and spherical shell is 1: 2-1: 3;
Perhaps, B. is further with composite pellet green-ball roasting ripe material pelletizing.
Further, also adding in the raw material of making pelletizing nuclear has garbage flying ash as raw material, and add-on is the 1-30% of ferrous material and reduction coal dust gross weight.
The ferrous material that adopts in the method is to adopt pelletizing concentrate and/or metallurgical waste (if under the situation that the both adopts, the pelletizing concentrate accounts for the 15-65% of ferrous material gross weight, metallurgical waste accounts for 25-75%).Described metallurgical waste adopts steel-smelting sewage sludge, ironmaking gravitational dust collection ash and/or sintering dust separation ash.
Pellet binder wilkinite, aluminate cement CA-50 are selected in described adhesive bond agent for use.
Present method is directly to utilize existing sophisticated metallurgical briquetting ore deposit balling disc, stoving oven (shaft furnace or rotary kiln or sinter machine) as treatment facility, and simultaneously garbage flying ash is carried out pre-treatment and improves metallurgical performance in the production process in metallurgical briquetting ore deposit.
The metallurgical composite pellet that the present invention obtains can be applied in the following areas:
1, the application in ironmaking, all or part of pellet that replaces iron-smelting blast furnace to use described metallurgical composite pellet adds in the iron-smelting blast furnace, smelts iron, and will reduce coke ratio, improves pig iron lumber recovery.
2, the application in the production metallurgy agglomerate, described metallurgical composite pellet green-ball is added in the metallurgy sintered machine according to the agglomerate production process as raw materials for sintering, form metallurgical composite sinter by the sinter machine roasting, adding part by weight is the 1-40% of total raw materials for sintering, the agglomerate ferrous grade is improved, and it is worth corresponding raising.
3, the application in producing steel-making, with the weight ratio of described metallurgical composite pellet by the 3-15% of whole steelmaking feed, the slag making ball of replacement steel-making converter adds in the steel-making converter makes steel and slag making, can improve the molten steel ratio, also can carry out the slag making function in the steelmaking process simultaneously.
The present invention is fully studying on the basis of international and domestic existing garbage flying ash melting treatment theory, bypassed those skilled in the art's conventional thought, adopt the balling-up mode dexterously twice, utilized existing metallurgical briquetting ore deposit stoving oven (shaft furnace or rotary kiln or sinter machine), in the production process of conventional pellet, simultaneously garbage flying ash is carried out pre-treatment, do not need to build specific equipment, reduce cost greatly, can not only carry out effective pre-treatment to garbage flying ash, do not produce new objectionable impurities, can also make the metallurgical performance of composite briquette ore substantially exceed conventional pellet, improve the blast furnace smelting technology economic target in the time of for thorough effectively treating refuse flying dust and lay good basis.
The pelletizer reason that below is the existing metallurgical briquetting ore deposit of this composite briquette ore utilization production line is analyzed:
After garbage flying ash and the metallurgical waste that satisfies pelletizing concentrate quality standard (steel-smelting sewage sludge, ironmaking gravitational dust collection ash, sintering dust separation ash etc.) and coal dust mixed the pelletizing nuclear bead that forms the 5-10mm diameter for the first time mutually and directly enter the production process in the metallurgical briquetting ore deposit second time, form composite briquette ore, because the main component of metallurgical waste and pelletizing concentrate is Fe
3O
4, can guarantee that smooth balling-up reaches metallurgical standard-required.
Below be the backing mechanism analysis of the existing metallurgical briquetting ore deposit stoving oven (shaft furnace or rotary kiln or sinter machine) of composite briquette ore utilization:
One, garbage flying ash
Its maturing temperature of sinter process by existing metallurgical briquetting ore deposit will reach about 1200 ℃, if under oxidizing atmosphere trivalent (Cr
3+) chromium ion will be transformed into hexavalent chromium (Cr
6+) the formation highly toxic substance, because composite pellet has and the far different composite structure in conventional metallurgical briquetting ore deposit, and contain the reduction coal dust in the little ball of metallurgical waste, then can guarantee as can be known that by metallurgy principle garbage flying ash is in the high-temperature reductibility atmosphere, can not generate hexavalent chromium (Cr
6+) form the new toxic substance of problem of secondary pollution, also can the iron-bearing material partial reduction become sponge iron simultaneously.
Two, metallurgical performance:
1. consolidation mechanism:
Direct reduction reactor has taken place in the nuclear bead of being made up of metallurgical waste and garbage flying ash, coal dust and/or coke powder under the high-temperature roasting condition, generated a certain amount of sponge iron, has formed the surface with Fe
2O
3Be main, transition is inner composite structure based on sponge iron gradually, thereby overcome the critical defect that there are contradiction in conventional pellet ore reduction and high temperature reduction intensity, fully guaranteeing to have guaranteed high temperature reduction intensity in the pellet ore reduction, greatly promoted the metallurgical performance index of raw pellet ore again.
2. weave construction:
Because pelletizing nuclear contains the reduction coal dust, composite briquette ore forms inside and contains a certain amount of sponge iron after the roasting.
3. basicity:
Because CaO content is higher in the metallurgical waste, then again raw pellet ore specific alkalinity is higher naturally mutually with conventional metallurgical briquetting ore deposit, help in the blast furnace production process to reduce flux consumption, reduce the agglomerate proportioning, finally improve again raw pellet ore and go into the stove proportioning, improve the blast furnace production process system.
In sum, this composite pellet is with ferrous material, and metallurgical waste and coal dust are raw material, directly utilizes existing metallurgical briquetting ore deposit stoving oven (shaft furnace or rotary kiln) to produce metallurgical composite briquette ore; Or directly utilize existing metallurgy sintered machine to produce metallurgical composite sinter; Or directly utilize existing metallurgical briquetting ore deposit stoving oven (shaft furnace or converter) to produce metallurgical compound steel scrap slag making ball and metallurgical compound steel scrap ball; Can also add garbage flying ash simultaneously, pellet-roasting stove (shaft furnace or rotary kiln) carries out pre-treatment to garbage flying ash simultaneously in the production process of conventional pellet, forms the metallurgical composite briquette ore of garbage flying ash.The present invention not only promotes the pellet metallurgical performance, do not need to build specific equipment, reduce cost greatly, can not only carry out effective pre-treatment to garbage flying ash, do not produce new objectionable impurities, can also make every metallurgical performance index of composite briquette ore be better than conventional pellet greatly, realizing that garbage flying ash is innoxious, also will improve the iron-smelting blast furnace technico-economical comparison greatly in the time of recycling utilization, improve the blast furnace smelting technology economic target in the time of for thorough effectively treating refuse flying dust and lay good basis, also will create considerable economic benefit when remarkable energy-saving, emission-reducing, environment friendly is administered social benefit obtaining.
Embodiment
One, preparation embodiment:
After pelletizing nuclear raw material (ferrous material, reduction coal dust or coke powder or further add garbage flying ash) advanced drying machine oven dry, in stirrer, carry out thorough mixing in proportion by disk feeder and stir, after balling disc adds water, cause composite pellet nuclear bead through rotary conveyor with same caking agent by another disk feeder charging; Then pelletizing is examined bead and delivered to pelletizing concentrate balling disc through rotary conveyor, after adding water, causes ferrous material green-ball, by roller picker to the screening of green-ball and particle after, send the distributor on vertical stoving oven top to and go into stove, by operations such as drying, preheating, roasting, soaking, coolings, pellet roasting ripe material pelletizing is discharged from furnace bottom, be transported to finished product bin by chapelet, store, transport outward by automatic emptying machine.
Below be concrete steps:
1, pelletizing nuclear is made in a balling-up
With ferrous material and coal dust and/or coke powder is raw material, adding additives in addition, and raw material is a powdery, fineness is at-8--200 order;
(1) earlier raw material being carried out drying deviates from excessive moisture to reach the production standard requirement by drying machine.
(2) batching: the disk feeder by controlling usage quantity separately enters stirrer with raw material and caking agent and carries out thorough mixing and stirring.
(3) group's ball: the raw material and the caking agent that mix are transported to balling disc through rotary conveyor, add the pelletizing nuclear of in balling disc, rolling into a ball into diameter 2-10mm behind the water;
2, metallurgical composite pellet is made in secondary balling-up
With pelletizing nuclear is the centre of sphere, is the spherical shell raw material with the ferrous material, adding additives in addition, and raw material is a powdery, fineness is at-8--200 order;
(1). pelletizing nuclear and ferrous material sent into produce with pelletizing nuclear in the balling disc to be the centre of sphere, to cover the composite pellet green-ball of ferrous material outward, the control pelletizing examine and the volume ratio of spherical shell 1: 2-1: 3.The green pellets that balling disc is sent is delivered to roller picker by rotary conveyor, and particle is sifted out, and qualified pelletizing can further enter down one calcining process.
(2) with green-ball roasting ripe material pelletizing.
A, material loading
The shaft furnace opening for feed is divided into two-layer, the green pellets import, and the middle layer is coal import and inlet flap.Green pellets is delivered to the top layer distributor by conveyor, by the Artificial Control uniform distribution.Shaft roasting is delivered to Coal charging platform with coal by lift, by hand firing, control air door air output.Pelletizing is a wet stock during shaft furnace material loading, so can not produce dirt by rotary conveyor is reinforced; Because of shaft furnace coal-hatch and air port are in sustained height, a small amount of coal dust that produces during last coal can enter the air door burning with air-flow rapidly.Therefore go up also no dust pollution generation of material process.
The B shaft roasting
Shaft furnace is an air inducing sintering negative-pressure operation, the qualified green pellets that sifts out through roller picker is added by the shaft furnace top layer, in stove, finish operations such as drying, preheating, roasting, soaking, cooling successively, produce acidic pellet ore according to existing pellet-roasting operation and processing condition.Cooled pellet through being transported to chapelet from unloading the goods from the airplane, is gone into storage bin through screening from shaft furnace lower floor discharging platform.During the shaft furnace discharging, no dust produces, because shaft furnace adopts the air inducing sinter process, and air-flow and furnace charge inverse motion, the dust that produces during discharging can reenter in the stove with air-flow; In addition, the particle diameter of discharging dust and density are all bigger, and the dust that enters in the stove with air-flow can not kicked up yet.
C, pelletizing sieve
Pelletizing will carry out the screening first time by roller picker after the disk pelletizer is produced, the pelletizing after the roasting also will be through the screening second time behind the chapelet.Qualified like this pelletizing can store, sell outward, and screenings returns and enters balling disc behind the stirrer and participate in making ball again.
D, finished product store outward transport
Pelletizing is transported to finished product bin through chapelet and stores, and can partly carry out the entrucking outward transport by the feed bin discharging.
Two, Application Example:
The use that the composite briquette ore that obtains by method for preparing advances blast furnace ironmaking:
The application of metallurgical composite pellet in ironmaking, all or part of pellet that replaces iron-smelting blast furnace to use described metallurgical composite pellet adds in the iron-smelting blast furnace, smelts iron.Charging of shaft furnace is pressed pellet 30-50%, and the ratio of agglomerate 50-70% is gone into stove.During each batch charging, composite pellet and common pelletizing are entered conveyor in proper order, promote hopper in the calculating ratio, enter blast furnace then.
The application of metallurgical composite pellet in the production metallurgy agglomerate, described metallurgical composite pellet green-ball is added in the metallurgy sintered machine according to the agglomerate production process as raw materials for sintering, form metallurgical composite sinter by the sinter machine roasting, adding part by weight is the 1-40% of total raw materials for sintering.
The application of metallurgical composite pellet in producing steel-making, with the weight ratio of described metallurgical composite pellet by the 3-15% of whole steelmaking feed, the slag making ball of replacement steel-making converter adds in the steel-making converter makes steel and slag making.
Three, the proportioning raw materials embodiment of metallurgical composite pellet (preparation method is all undertaken by the mode of front first part):
Embodiment 1:
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 58.3% by 43.7%
2, ferrous oxide content drops to 7.36% by 13.4%
Embodiment 2
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 60.1% by 46.3%
2, ferrous oxide content drops to 0.9% by 17.9%
Embodiment 3
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 48.89% by 38.7%
2, ferrous oxide content drops to 5.57% by 16.4%
Embodiment 4
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 47.9% by 42.3%
2, ferrous oxide content drops to 0.9% by 20.3%
Embodiment 5
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 55.79% by 43.7%
2, ferrous oxide content drops to 1.26% by 16.4%
Embodiment 6
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 61.88% by 47.3%
2, ferrous oxide content drops to 0.72% by 20.3%
Embodiment 7
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 49.2% by 38.7%
2, ferrous oxide content drops to 8.08% by 16.4%
Embodiment 8
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 49.42% by 42.3%
2, ferrous oxide content drops to 2.42% by 20.3%
Embodiment 9
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 71.02% by 56.3%
2, ferrous oxide content drops to 3.42% by 28.3%
Embodiment 10
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 68.32% by 55.2%
2, ferrous oxide content drops to 1.22% by 26.3%
Embodiment 11
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 78.43% by 59.4%
2, ferrous oxide content drops to 3.01% by 26.2%
Embodiment 12
Metallurgical composite pellet result behind roast: 1, the iron grade brings up to 75.15% by 57.8%
2, ferrous oxide content drops to 2.12% by 24.1%
Table one: raw material physico-chemical property
We adopt this method to compare with traditional pelletizing, reduction effect has taken place in pelletizing nuclear, reduction rate is fast, reach the heat transfer of reduction reaction and the process of mass transfer, and the low temperature powder phenomenon-tion can not appear, the metallurgical composite pellet characteristics such as high strength of having come out of the stove very, we are verified in the reality by the proportioning application of various metallurgical composite pellets.
The present invention is fine used theory of reduction make pelletizing all temps stage from inside to outside, successively reduction reaches effect preferably.This method is in the operation of pelletizing high temperature oxidation roast, and pelletizing nuclear has produced reducing atmosphere and made ferrous material obtain reduction, and can make full use of various smelting waste steels, and garbage flying ash has been carried out innoxious pre-treatment.
Claims (7)
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