CN101724745B - Production method of metallized pellet - Google Patents
Production method of metallized pellet Download PDFInfo
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- CN101724745B CN101724745B CN2008101712845A CN200810171284A CN101724745B CN 101724745 B CN101724745 B CN 101724745B CN 2008101712845 A CN2008101712845 A CN 2008101712845A CN 200810171284 A CN200810171284 A CN 200810171284A CN 101724745 B CN101724745 B CN 101724745B
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Abstract
The invention relates to a production method of a metallized pellet, which comprises the following steps of sintering a bottom material layer, an ore-coal pellet layer, a reducing agent layer and a sintering material layer, enabling iron containing compounds in the ore-coal pellet layer to be reduced to an elementary iron by sintering and simultaneously enabling sintering materials to form sintering ores, wherein the bottom material layer, the ore-coal pellet layer, the reducing agent layer and the sintering material layer are sequentially paved in a stacking way from bottom to top. Because a multi-layer charging technology is adopted, metallized pellets can be produced in a large scale, the sintering ores are obtained when the metallized pellets are produced, the traditional equipment and technology are fully utilized, the prepared metallized pellets have higher metallization rate, in addition, the invention also has the advantages of low energy consumption and large production capacity of the metallized pellets.
Description
Technical field
The present invention relates to a kind of production method of metallized pellet.
Background technology
Iron ore concentrate adopts direct reduction technique to produce metallized pellet or sponge iron, and traditional process equipment is mainly shaft furnace, rotary kiln or fluidized-bed.Adopt shaft kiln directly reducedly, reduction temperature is 1100 ℃, and the recovery time is 8 hours, and degree of metalization is no more than 83%; Adopt rotary kiln for directly reducing, reduction temperature is 1050 ℃, and the recovery time is 6 hours, and degree of metalization can only reach 75%; Adopt fluidized-bed directly to reduce, reduction temperature is 850 ℃, and the recovery time is 4 hours, and degree of metalization can reach 85%.No matter adopt above-mentioned which kind of reduction mode, all exist the shortcoming that the recovery time is long, degree of metalization is not high, production efficiency is low.And employing rotary hearth furnace or the direct reduction technique reduced iron of fixed bed concentrate, under the condition of 1300 ℃ of reduction temperatures and 30 minutes recovery times, though degree of metalization can reach more than 90%, but owing to change end road stove or the influence of fixed bed furnace atmosphere, it is serious that metallized pellet reoxidizes degree, and degree of metalization can be reduced to below 85% when coming out of the stove.And the bed thickness of rotary hearth furnace or fixed bed is the 25-40 millimeter, throughput can only reach 65 kilograms/(square metre hour) about, have the shortcoming that throughput is little, production efficiency is low.
" agglomerates of sintered pellets " the 23rd volume the 2nd phase (in March, 1998) disclosed " involucrum pit coal pelletizing sintering process reduction---the experimental study of fine grinding ore dressing " has been described when preparation pit coal pelletizing, be that the ratio of 100:40:10 prepares and mixing is made ball then in mass ratio earlier with fine ore, coal dust and slaked lime, the ball that to make adds suitable quantity of water and refractory mortar carries out involucrum then, adopts belt roasting sinter machine to carry out the method for roasting reduction production high-quality iron powder.The problem that this method exists is: (1) adopts full dress pit coal pelletizing process, and reoxidizing after the reduction of upper strata pelletizing is difficult to avoid; (2) at pelletizing coated outside refractory materials, separation difficulty behind the sintering reduced the purity of the iron powder that reduction obtains, and the adding of refractory materials and slaked lime has strengthened the difficulty that subsequent handling is handled; (3) process energy consumption and the control accuracy at pit coal pelletizing external parcel refractory materials requires high.
CN101126121A discloses a kind of production method of pre-reducing composite sinter, this method adopts high basicity sinter and two kinds of furnace charges of acidic pellet ore to mix, and in the raw material of acidic pellet ore system ball with addition of coal dust, then high basicity sinter and the acidic pellet ore that mixes carried out sintering, production prereduction blast furnace furnace charge together on sinter machine.The characteristics of this method and the problem of existence are: (1) mixes the back sintering with agglomerate and pellet, and the material component unanimity of producing can not be separated; (2) degree of metalization of material is lower behind the sintering, is no more than 40% in theory, can only use as blast furnace burden; (3) reoxidizing after the reduction of upper strata sintered material is difficult to avoid.
Summary of the invention
The objective of the invention is can not make full use of existing installation in order to overcome in the prior art, defective that can not the large-scale production metallized pellet and a kind of existing installation and technology of can making full use of is provided makes the method for iron ore concentrate metallized pellet large-scale production.
The invention discloses a kind of production method of metallized pellet, wherein, this method comprises carries out sintering to stacking gradually initial bed, pit coal pelletizing layer, reductant layer and the sinter bed of putting formation in the shop from top to bottom, described sintering makes the iron containing compounds in the pit coal pelletizing layer be reduced to fe, makes sintered material form agglomerate simultaneously.
Compared with prior art; adopt the multilayer charging technology of the present invention metallized pellet of can accomplishing scale production; when producing metallized pellet, obtain agglomerate; existing installation and technology have been made full use of; and the degree of metalization of producing the metallized pellet that obtains is higher; in addition, also have the characteristics that energy consumption is low, metallized pellet throughput is big.Produce metallized pellet or sponge iron has been opened up a new way for iron ore concentrate, have bigger economic benefit and social effect.
Description of drawings
Fig. 1 is the multilayer charging synoptic diagram in the production method of metallized pellet of the present invention.
Embodiment
According to the present invention, this method comprises carries out sintering to stacking gradually initial bed, pit coal pelletizing layer, reductant layer and the sinter bed of putting formation in the shop from top to bottom, described sintering makes the iron containing compounds in the pit coal pelletizing layer be reduced to fe, makes sintered material form agglomerate simultaneously.For example, as shown in Figure 1, al is an initial bed, and a2 is a pit coal pelletizing layer, and a3 is a reductant layer, and a4 is a sinter bed.
The thickness ratio that the method according to this invention, described stacked shop are put initial bed, pit coal pelletizing layer, reductant layer and the sinter bed of formation can be (10-25): (100-350): (10-30): (150-400).
According to the present invention, the pit coal pelletizing of described formation pit coal pelletizing layer can be a various pit coal pelletizing well known in the art, for example, can be for coating or not coating the pit coal pelletizing of refractory materials, in order to make the metallized pellet that makes not polluted by refractory materials, the present invention is preferably the pit coal pelletizing that does not coat refractory materials, and for example, described pit coal pelletizing can contain iron ore concentrate, reductive agent and binding agent.
Described iron ore concentrate is with the iron grade higher powdered iron ore of poor iron ore through fine grinding, selected acquisition.Iron ore concentrate is divided into magnetite concentrate, red iron ore concentrate and brown iron ore concentrate according to the difference of iron-bearing mineral; According to the difference of beneficiation method, be divided into inferior fine magnetite concentrate, strong magnetic concentrate, flotation concentrate and gravity concentrate.The iron grade of iron ore concentrate is higher, generally more than 50%.
Described reductive agent can be the various materials that contain simple substance carbon, and for example, the described material that contains simple substance carbon can be selected from one or more in coal, coke and the graphite; The particle diameter of described reductive agent generally can be the 0.05-0.15 millimeter.
Described binding agent can be various binding agents, as mineral binder bond and/or organic binder bond.Described mineral binder bond can be wilkinite, and the granular size of described mineral binder bond generally can be the 0.05-0.15 millimeter; Described organic binder bond can be polyvinyl alcohol and/or cellulose-based polymer, described cellulose-based polymer can be various cellulose-based polymers, for example, can be selected from methylcellulose gum, ethyl cellulose, propyl cellulose, carboxymethyl cellulose and the Vltra tears one or more.
According to the present invention, the adjustable extent broad of the weight ratio of iron ore concentrate, reductive agent and binding agent in the described pit coal pelletizing, as long as can form the pelletizing shape, and iron ore concentrate fully is reduced get final product, under the preferable case, the weight ratio of described iron ore concentrate, reductive agent and binding agent can be 100:(20-40): (1-3).
According to the present invention, can adopt manual method or adopt various device to prepare the pit coal pelletizing, for example, can be with iron ore concentrate, reductive agent and binding agent according to 100:(20-40): quality (1-3) than mixing after, with or with behind the water mixing do not adopt the mode add mechanical force to be pressed into the elliposoidal pit coal pelletizing that major diameter is the 15-35 millimeter, can in the scope of broad, adjusting of the ratio of the major diameter of described elliposoidal and minor axis diameter, generally speaking, the ratio of described major diameter and minor axis diameter can be 1:0.2-0.8; Also can directly adopt balling disc to make the spherical pit coal pelletizing that diameter is the 10-25 millimeter, and be about 2% in the water content that is dried to the pit coal pelletizing under 100-250 ℃.
Described bed material is the agglomerate bed material of laying in the sintering process ordinary production.Piece, the granular furnace charge of described agglomerate for obtaining behind the mixture sintering with iron ore concentrate or rich ore powder, solid fuel and flux.
Reductive agent in the described reductant layer generally can be coal and/or burnt grain, and it is block that described coal is generally, and the volume of lump coal can be the 4-25 cubic centimetre; Described burnt grain is a coke granule, and the particle volume of described burnt grain can be the 4-20 cubic centimetre; Described burnt grain can be commercially available.
Sintered material in the described sinter bed can be for well known to a person skilled in the art various sintered materials, and for example, described sintered material can be the mixture of iron ore concentrate or rich ore powder, solid fuel (or other carbonaceous material) and flux.Rich ore refers to the iron ore that the iron grade is higher, and iron-holder is generally more than 50%.Wherein, described solid fuel can be fuel such as coke, coal; Described flux can be Wingdale etc.The sintered material sintering can be lighted and make to the adjustable extent broad of the ratio of iron ore concentrate or rich ore powder, solid fuel and flux as long as guarantee under ignition temperature.
In the roasting reduction process, described sinter bed not only can prevent the secondary oxidation of the pit coal pelletizing of lower floor, can also play the effect of preheating and insulation to the pit coal pelletizing, helps further improving the degree of metalization of pit coal pelletizing.In addition, in the roasting reduction process, when producing metallized pellet, can also make the sintered material sintering generate agglomerate simultaneously.
According to the present invention, the condition of described roasting reduction can be the sintering condition of routine, generally speaking, in sintering process, the difficult control of sintering temperature, as long as generally guarantee to make under ignition temperature the upper strata sintered material to light, ignition temperature generally is lower than sintering temperature, described ignition temperature is generally 1000-1100 ℃, and sintering temperature generally can be 1200-1350 ℃.About the time of roasting reduction, it is generally acknowledged to sinter to always from the upper strata sinter bed that sintering finishes behind the initial bed that can observe section and each box temperature of sinter machine judges whether sintering finishes according to discharging, determination methods is as well known to those skilled in the art.
According to the present invention, can adopt the multiple equipment that is used to produce metallized pellet to implement method of the present invention, under the preferable case, adopt multilayer charging technology, take into account the production agglomerate simultaneously on the upper strata when producing metallized pellet in order to be implemented in lower floor better, the present invention preferably adopts Dwight-Lloyd sintering machine to carry out sintering.
Mode below by embodiment further describes the present invention.
Embodiment 1
Present embodiment is used to illustrate the production method of metallized pellet provided by the invention.
(main component of sampling and measuring sefstromite concentrate is TFe:54.01%, FeO:27.02%, V with sefstromite concentrate
2O
5: 0.56%, Cr
2O
3: 1.08%, TiO
2: 12.18%), with being pressed into major diameter after coal dust (particle diameter is 0.074 millimeter〉75%) and wilkinite (particle diameter is 0.074 millimeter〉70%) mix according to the weight ratio of 100:25:1.5 is 25 millimeters oval pit coal pelletizings, 200 ℃ dry 4 hours down, to the water content of pit coal pelletizing be 2.1%.Agglomerate bed material, pit coal pelletizing, coke and sintered material are feeded in Dwight-Lloyd sintering machine successively according to order from bottom to top, and the thickness of agglomerate initial bed, pit coal pelletizing layer, coke layer (the coke granule diameter is the 10-15 millimeter) and sinter bed is respectively 15 millimeters, 200 millimeters, 25 millimeters and 250 millimeters.After 1100 ℃ of ignition temperatures, roasting reduction finished, the agglomerate that the upper strata is obtained by sintered material was directly as blast furnace burden, and lower floor's reducting pellet adds electric furnace as schreyerite comprehensive utilization furnace charge to be used.
The degree of metalization of pit coal pelletizing is 81% (full iron (TFe) content in degree of metalization (%)=pit coal pelletizing reduction back metal Ferrum content/pit coal pelletizing), carbon residue content is 1.7% (adopting infrared carbon sulfur analyzer to measure (production of U.S. Leco Corporation)), throughput be 240 kilograms/(square metre hour).
Embodiment 2
Present embodiment is used to illustrate the production method of metallized pellet provided by the invention.
With common iron ore concentrate (main component of the common iron ore concentrate of sampling and measuring is TFe:59.01%, FeO:15.6%) with coke powder (particle diameter is 0.074 millimeter〉40%) and polyvinyl alcohol according to the weight ratio of 100:20:1 mix the back adopt disk to make ball to produce diameter be 15 millimeters pit coal pelletizing.Drying 6 hours water content to the pit coal pelletizing down at 150 ℃ is 1.9%.Agglomerate bed material, pit coal pelletizing, coke and sintered material are feeded in Dwight-Lloyd sintering machine successively according to order from bottom to top, and the thickness of agglomerate initial bed, pit coal pelletizing layer, coke layer (particle diameter is the 10-15 millimeter) and sinter bed is respectively 20 millimeters, 250 millimeters, 25 millimeters and 300 millimeters.After 1060 ℃ of ignition temperatures, roasting reduction finished, the agglomerate that the upper strata is obtained by sintered material was directly as blast furnace burden, and lower floor's reducting pellet can be directly as the sponge iron product.
The degree of metalization of pit coal pelletizing is 89% (full iron (TFe) content in degree of metalization (%)=pit coal pelletizing reduction back metal Ferrum content/pit coal pelletizing), carbon residue content is 0.8% (adopting infrared carbon sulfur analyzer to measure (production of U.S. Leco Corporation)), throughput be 300 kilograms/(square metre hour).
From The above results as can be seen; adopt the multilayer charging technology of the present invention metallized pellet of can accomplishing scale production; and when producing metallized pellet, also obtain agglomerate, made full use of existing installation, and it is higher to produce the degree of metalization of the metallized pellet that obtains.
Claims (9)
1. the production method of a metallized pellet, it is characterized in that, this method comprises carries out sintering to stacking gradually initial bed, pit coal pelletizing layer, reductant layer and the sinter bed of putting formation in the shop from top to bottom, described sintering makes the iron containing compounds in the pit coal pelletizing layer be reduced to fe, make sintered material form agglomerate simultaneously, the pit coal pelletizing that forms pit coal pelletizing layer contains iron ore concentrate, reductive agent and binding agent, and the sintered material in the described sinter bed is the mixture of iron ore concentrate or rich ore powder, solid fuel and flux.
2. method according to claim 1, wherein, the thickness of described initial bed, pit coal pelletizing layer, reductant layer and sinter bed is than being (10-25): (100-350): (10-30): (150-400).
3. method according to claim 1, wherein, the mass ratio of iron ore concentrate, reductive agent and binding agent is 100: (20-40): (1-3).
4. according to claim 1 or 3 described methods, wherein, the reductive agent in the described pit coal pelletizing is the material that contains simple substance carbon, and described binding agent is mineral binder bond and/or organic binder bond.
5. method according to claim 4, wherein, the described material that contains simple substance carbon is selected from one or more in coal, coke and the graphite; Described mineral binder bond is a wilkinite; Described organic binder bond is polyvinyl alcohol and/or cellulose-based polymer.
6. method according to claim 1 and 2, wherein, described pit coal pelletizing is sphere or elliposoidal, the spheric diameter is the 10-25 millimeter; The major diameter of elliposoidal is the 15-35 millimeter.
7. method according to claim 1, wherein, described sintering carries out in Dwight-Lloyd sintering machine.
8. method according to claim 1 and 2, the reductive agent in the described reductant layer are coal and/or burnt grain.
9. method according to claim 1 and 2, the bed material in the described initial bed are agglomerate, piece, the granular furnace charge of described agglomerate for obtaining behind the mixture sintering with iron ore concentrate or rich ore powder, solid fuel and flux.
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| CN2008101712845A CN101724745B (en) | 2008-10-30 | 2008-10-30 | Production method of metallized pellet |
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| CN2008101712845A CN101724745B (en) | 2008-10-30 | 2008-10-30 | Production method of metallized pellet |
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| CN101724745A CN101724745A (en) | 2010-06-09 |
| CN101724745B true CN101724745B (en) | 2011-12-14 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102312084A (en) * | 2010-06-29 | 2012-01-11 | 鞍钢股份有限公司 | Compound sintering method for iron-contained raw material |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
| CN102766717A (en) * | 2012-08-17 | 2012-11-07 | 北京科技大学 | Method for treating high phosphorus ore by using direct reduction process |
| CN103924071B (en) * | 2014-04-18 | 2016-04-27 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of preparation method containing iron ore pellets |
| CN103937970B (en) * | 2014-04-18 | 2016-04-27 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of pelletizing process of rotary hearth furnace direct-reduction production technique pelletizing |
| CN104060013B (en) * | 2014-06-30 | 2015-10-21 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of rotary hearth furnace direct-reduction is containing the method for sefstromite |
| KR101779548B1 (en) * | 2016-08-01 | 2017-09-18 | 주식회사 포스코 | Process method of raw material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1202528A (en) * | 1997-04-10 | 1998-12-23 | 奥托库姆普联合股份公司 | Method and apparatus for sintering finely divided material |
| CN101070562A (en) * | 2006-05-12 | 2007-11-14 | 万天骥 | Method for producing metallized iron-smelting raw material |
| CN101177731A (en) * | 2007-11-30 | 2008-05-14 | 攀钢集团攀枝花钢铁研究院 | Method for preparing sintered ore |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1202528A (en) * | 1997-04-10 | 1998-12-23 | 奥托库姆普联合股份公司 | Method and apparatus for sintering finely divided material |
| CN101070562A (en) * | 2006-05-12 | 2007-11-14 | 万天骥 | Method for producing metallized iron-smelting raw material |
| CN101177731A (en) * | 2007-11-30 | 2008-05-14 | 攀钢集团攀枝花钢铁研究院 | Method for preparing sintered ore |
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