CN100342041C - Method for making fluxed iron ore powder composite pellet - Google Patents
Method for making fluxed iron ore powder composite pellet Download PDFInfo
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- CN100342041C CN100342041C CNB2006100012540A CN200610001254A CN100342041C CN 100342041 C CN100342041 C CN 100342041C CN B2006100012540 A CNB2006100012540 A CN B2006100012540A CN 200610001254 A CN200610001254 A CN 200610001254A CN 100342041 C CN100342041 C CN 100342041C
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Abstract
The present invention relates to a method for making a composite pellet of a fluxed iron ore powder. In the method, a single double-basicity composite fluxed pellet is produced by a multiple pelletizing mode, that is, in the first pelletizing process, a raw pellet contains proper quantity of CaO and MgO, wherein the weight ratio of CaO/SiO2 ranges from 0.5 to 2.0%, and MgO accounts for 2 to 4 wt% of the raw pellet; then in the second pelletizing process, the outer surface of the raw pellet is uniformly coated with an antisticking layer of a limestone powder, a dolomite powder, a hematite powder or an acidic iron ore concentrate powder, etc., and roasted by adopting the roasting temperature and the roasting mode of an acidic pellet ore so as to ensure no generation of sticking of pellet ores. The method preferably solves the problem of sticking frequently occurring in the roasting process of fluxed pellets, has the advantages of less investment, low energy consumption and less pollution, and is favourable to increase in yield and reduction in energy consumption in blast furnace ironmaking; in addition, the present invention can meet the requirements for pH value balance and desulfurization in blast furnace ironmaking, and enhance the proportion of pellet ores used in blast furnaces.
Description
Technical field
The present invention relates to a kind of production method of flux iron ore powder composite pellet, exactly, relate to a kind of production method that can solve the flux iron ore powder composite pellet of the adhesion problem of fluxed pellets ore deposit in roasting process preferably; The furnace charge preparing technical field that belongs to iron manufacturing process.
Background technology
At present, the production technology of China's iron-smelting furnace charge allows of no optimist, and the iron-smelting raw material of each Steel Plant is to be equipped with a small amount of acidic pellet ore based on high basicity sinter substantially.With 2003 be example, agglomerate accounts for more than 80%, pellet only accounts for about 12%.The pellet ratio of most of Steel Plant does not all break through 30%.Compare with agglomerate, that pellet has is of high grade, epigranular, intensity height, powder containing quantity are few, it is low to contain the gangue amount, and multiple advantage such as the content of ferric oxide is also low.And, the processing charges of pellet also is starkly lower than agglomerate: the production process energy consumption of pellet is generally at 23～30 kilograms of standard coal/tons, agglomerate then is 50～70 kilograms of standard coal/tons, the small-sized sinter machine energy consumption of domestic part even breakthrough double centner standard coal/ton.Moreover the Dust Capacity that pellet is supervened in process of production also obviously is less than agglomerate, has reduced the pollution to environment relatively.
In addition, the metallurgical performance and the agglomerate of pellet are made comparisons, and have the following advantages: help improving the ventilation property of blast furnace stock column, make the air-flow uniform distribution.Physical strength height during cold conditions, comparatively robust is difficult for broken, cracking when transportation, loading and unloading and storage, and loss is few, and the powder of generation is few.Ferrous components content in the iron ore is high and bulk density is big, helps increasing the effective weight of blast furnace stock column, improves output and reduces coke ratio; And, Well-recovered, help improving the utilization of coal gas chemical energy.
As everyone knows, the coefficient of thermal expansion of acidic pellet ore generally is higher than agglomerate, thereby in smelting process, acidic pellet ore can cause the powder phenomenon-tion in the high temperature reduction process quite serious, causes the working of a furnace to worsen, this drawbacks limit blast furnace use the ratio of pellet.
If in making the ball process, add the flux that a part contains CaO, can significantly improve the physical strength and the reduction degree of pellet, obviously improve the metallurgical performance of pellet.But when roasting, the fluxed pellets ore deposit of containing CaO generates low-melting calcium ferrite compound easily, causes bonding, is difficult to control on the production technique.Thereby, the at present domestic enterprise that production fluxed pellets ore deposit is seldom arranged.And the fluxed pellets ore deposit of containing CaO is when blast-furnace smelting, though the reduction degree height, its fusing and softening temperature are low.
In order further to improve the every smelting performance of fluxed pellets ore deposit in blast furnace, just must improve pellet fusing point of slag during melting in blast furnace.Have now and studies have shown that the fluxed pellets ore deposit of containing MgO has following advantage: the reduction degree height, higher softening temperature and melt temperature are arranged, can reduce blast furnace coke ratio and improve furnace processor.Therefore, if can in the fluxed pellets ore deposit, add MgO, just become a breakthrough point that improves the pellet performance.
At present, the pellet manufacturing enterprise of China adopts single ball dish once to make ball success, single ball component content homogeneous.So far domestic report or the message that does not still have the two basicity pellets of manufacture order ball.Simultaneously, because international iron ore price is lasting high, cause domestic small-scale mine to roll up 5m
3About ring-like little shaft furnace also increase thereupon.These shaft furnaces disperse to be arranged on various places, and technology falls behind, and quality product is low, the energy consumption height, and the operating cost height, environmental pollution is big.
For energy-saving and cost-reducing, the technological transformation of Fe and reducing Si is all being put forward by each ore dressing enterprise, and the smart powder of iron after the process fine grinding of this explained hereafter also is fit to produce pellet, is unfavorable for producing agglomerate.
In sum, the present basic situation of China's iron-smelting raw material, can be summarized as following some: the agglomerate that investment is big, energy consumption is high still is the main body of iron-smelting raw material.As the pellet of good iron-smelting raw material, especially the development space in fluxed pellets ore deposit is huge.But this fluxed pellets ore deposit does not also have the production technique of typing so far.Therefore, how to research and develop that a kind of technology is simple, the production method in processing ease, fluxed pellets ore deposit that product performance are good become the focus that those skilled in the art pay close attention to.
Summary of the invention
In view of this, the production method that the purpose of this invention is to provide a kind of flux iron ore powder composite pellet, this method has solved fluxed pellets recurrent adhesion problem in roasting process preferably, production technique with respect to agglomerate, have that investment is little, energy consumption is low, pollutions is few, the advantage that helps blast furnace ironmaking raising output and cut down the consumption of energy.The present invention can also satisfy the requirement of blast furnace ironmaking ph balancing or desulfurization, makes blast furnace use the ratio of pellet to be improved.
In order to achieve the above object, the invention provides a kind of production method of flux iron ore powder composite pellet, it is characterized in that: adopt and repeatedly make the two basicity composite fluxing agent pelletizings of ball mode manufacture order ball; Just making in the ball process for the first time, make and contain proper C aO and MgO in the green-ball, carry out making the second time ball then, skin wraps uniform antiplastering layer on the green-ball surface, adopt the maturing temperature and the roasting mode of acidic pellet ore to carry out roasting again, guarantee that pellet does not produce bonding; Described method comprises the steps:
(1) material is prepared, and wherein the proportioning of each moiety is all weight ratio:
A, fine iron breeze:
The basic iron fine ore: full iron TFe＞63%, wherein the impurity requirement is: SiO
2＜3%, CaO＜1%, MgO:2～4%, S＜0.02%, P＜0.02%; The smart powder degree of iron requires :-200 order screen underflow＞70%;
B, as the slaked lime of flux and tackiness agent:
Calcareous slaked lime: CaO＞65%, MgO＜3%, SiO
2＜4%;
Magnesia slaked lime: CaO＞39%, MgO＞31%, SiO
2＜2%;
C, as the limestone flour of flux and antiplastering layer:
Limestone powder: CaO＞50%, MgO＞1.9%, SiO
2＜2.4%, granularity requirements is :-200 order screen underflow＞50%;
Ground dolomite: CaO＞30%, MgO＞20%, SiO
2＜1.9%, granularity requirements is :-200 order screen underflow＞50%;
D, as the ground hematite of antiplastering layer: full iron TFe＞52%, wherein impurity require be: SiO
2＜10%, S＜0.08%, P＜0.1%; The ground hematite granularity requirements is :-200 order screen underflow＞40%;
(2) production technique:
Earlier with electronic batching scale following butt material is carried out batching: wilkinite is 0.6 ± 0.1%, calcareous slaked lime is 5～6%, and the basic iron fine ore is 93～94%;
After above-mentioned batching mixed, be transported to the transfer feed bin and stock, be transported to via the disk feeder under the transfer feed bin then and make ball in the balling disc, the diameter of green-ball requires to be 6～15mm;
The green-ball of making is transported to carries out twice processing on the multiple roll sieve: carry out vaporific water spray to green-ball earlier, and the following diameter of sieve is less than the green-ball of 5mm, again by the vibratory screening apparatus sieve of multiple roll sieve top down as butt limestone powder, ground dolomite or the ground hematite of antiplastering agent, make the green-ball surface behind the water spray evenly wrap the antiplastering layer that thickness is 1～2mm;
This green-ball being sent to second balling disc carries out closely knit and screening again, be delivered directly to shaft furnace then and carry out roasting, maturing temperature is: 1050 ± 20 ℃, roasting time is: 20～24 minutes, the pellet that roasting is good carries out naturally cooling to be handled, can not drench with rain when the air storage of stockyard, the time was not less than 48 hours; Screen with vibratory screening apparatus, finish whole operations, the diameter of finished ball nodulizing is 6～16mm.
The composition of described antiplastering layer is limestone powder, ground dolomite or rhombohedral iron ore dry powder.
Make the dual alkalinity CaO/SiO that contains in the green-ball of ball the described first time
2Weight ratio between 0.5～2.0, the MgO weight ratio that contains is between 2～4%.
The dual alkalinity CaO/SiO of the pellet that described production method is made
2Weight ratio be 1.0 ± 0.1, MgO content is greater than 2%.
When the butt material being carried out batching, can add limestone powder, to improve the dual alkalinity of pellet with electronic batching scale; The weight ratio of the limestone powder that adds depends on the dual alkalinity of setting.
In order to achieve the above object, the present invention also provides a kind of production method of flux iron ore powder composite pellet, it is characterized in that: adopt and repeatedly make the two basicity composite fluxing agent pelletizings of ball mode manufacture order ball; Just making in the ball process for the first time, make and contain proper C aO and MgO in the green-ball, carry out making the second time ball then, skin wraps uniform antiplastering layer on the green-ball surface, adopt the maturing temperature and the roasting mode of acidic pellet ore to carry out roasting again, guarantee that pellet does not produce bonding; Described method comprises the steps:
(1) material is prepared, and wherein the proportioning of each moiety is all weight ratio:
A, fine iron breeze:
Acid fine iron breeze: full iron TFe＞67%, wherein the impurity requirement is: SiO
2＜4%, MgO＜1.5%, S＜0.05%, P＜0.02%; The fine iron breeze granularity requirements is :-200 order screen underflow＞60%;
B, as the magnesia slaked lime of flux and tackiness agent: CaO＞39%, MgO＞31%, SiO
2＜2%;
C, as the ground dolomite of flux: CaO＞30%, MgO＞20%, SiO
2＜1.9%, granularity requirements is :-200 order screen underflow＞50%;
D, as the ground hematite of antiplastering layer: full iron TFe＞52%, wherein impurity require be: SiO
2＜10%, S＜0.08%, P＜0.1%; The ground hematite granularity requirements is :-200 order screen underflow＞40%;
(2) production technique:
Earlier with electronic batching scale following butt material is carried out batching: wilkinite is 0.6 ± 0.1%, magnesia slaked lime is 5 ± 1%, ground dolomite is 10～14%, and acid fine iron breeze is 80～84%;
After above-mentioned batching mixed, be transported to the transfer feed bin and stock, be transported to by the disk feeder under the transfer feed bin then and make ball in the balling disc, the diameter of green-ball requires to be 6～15mm;
The green-ball of making is transported on the multiple roll sieve sieves, sieve diameter down carries out vaporific water spray to green-ball simultaneously and handles less than the green-ball of 5mm; Send it to again on second balling disc, and add water content therein and be lower than 6% smart powder of acid iron and 1% wilkinite compound or rhombohedral iron ore dry powder, smart powder of this compound iron or rhombohedral iron ore dry powder are wrapped up on the surface of green-ball outside evenly in pelletizer, finish and make ball for the second time, this outer antiplastering layer thickness of wrapping up in is 1～3mm;
This green-ball of making directly is sent to shaft furnace and carries out roasting, and maturing temperature is: 1050 ± 20 ℃, roasting time is: 20～24 minutes; The feed bin that the pellet that roasting is good can directly be delivered to iron work carries out the naturally cooling processing, finishes whole operations.
The composition of described antiplastering layer is the acid fine iron breeze of rhombohedral iron ore dry powder or low Si.
The dual alkalinity CaO/SiO of the pellet that described production method is made
2Be (0.9～1.3) ± 0.1, MgO content is greater than 2%.
The present invention is the production method of the two basicity flux iron ore powder composite pellets of a kind of single ball, compare with the production technique of sintered iron ore, have following advantage: less investment, can carry out small-scale production, be fit to especially that domestic mine capacity is little, the present situation of dispersion, powdered iron ore complicated component.Grasp the potential of hydrogen of composite pellet ore easily, can be dual alkalinity (CaO/SiO
2) grasp and in 0.6～2.0 scope, produce, can partly or entirely substitute agglomerate.Save energy: required coal consumption only is 50% of the required coal consumption of agglomerate in the flux composite pellet roasting stage in the present invention; In blast furnace ironmaking process, also than agglomerate energy efficient.Exhaust gas emissions such as the sulphur in the production process are few, and technology is succinct, and equipment operation and the expense of safeguarding are cheap.
Use the flux iron ore powder composite pellet ore deposit of production method manufacturing of the present invention to compare, have following advantage: contain CaO and MgO in the composite pellet ore, in blast furnace ironmaking process, save coke, can guarantee that again blast furnace production carries out smoothly with acidic pellet ore; And the solid sulphur effect of CaO can also reduce the sulphur emissions amount in the roasting process, reduces topsoil.Reduce the wilkinite usage quantity, help the blast furnace volume increase.
Description of drawings
Fig. 1 is first kind of embodiment technological process of production synoptic diagram of the production method of flux iron ore powder composite pellet of the present invention.
Fig. 2 is second kind of embodiment technological process of production synoptic diagram of the production method of flux iron ore powder composite pellet of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of production method of flux iron ore powder composite pellet, and it is to adopt repeatedly to make the two basicity composite fluxing agent pelletizings of ball mode manufacture order ball, is just making in the ball process for the first time, according to producing required dual alkalinity (CaO/SiO
2) requirement, make and contain proper C aO and MgO in the green-ball, carry out making the second time ball then, the outer antiplastering layer that evenly wraps limestone powder, ground dolomite, rhombohedral iron ore dry powder or low Si acidity fine iron breeze etc. on the green-ball surface, adopt the maturing temperature and the roasting mode of acid pellet to carry out roasting again, guarantee that pelletizing does not produce bonding.
Introduce two embodiment situations of the present invention below respectively in conjunction with the accompanying drawings.
Referring to Fig. 1, first embodiment is to use calcareous ash to make flux, the CaO/SiO in the green-ball
2Weight ratio be controlled at 0.6～1.3, the weight ratio of MgO content is controlled between 2～4%, wraps up in the butt ground dolomite or ground hematite carries out making the second time ball as the antiplastering layer outward then, to prevent the bonding between each ball in the roasting.Carry out roasting according to acidic pellet ore required maturing temperature and time then,
Detailed process is: the wilkinite with 0.6%, 5 ± 1% calcareous slaked lime (butt), 94% basic iron fine ore and an amount of limestone powder (according to the requirement of dual alkalinity with addition of), prepare burden with electronic batching scale, be sent to then and carry out batch mixing in the cylindrical mixer, be transported to the transfer feed bin by the skin band and stock, be put into by the disk feeder under the transfer feed bin then and carry out making the first time ball in the balling disc.The green-ball diameter requires to be 6～15mm.The ball of making for the first time is transported on the multiple roll sieve, two sections of this multiple roll screenings: leading portion carries out vaporific water spray to green-ball earlier, and the following green-ball of sieve less than 5mm, back segment is by the vibratory screening apparatus sieve of multiple roll sieve top ground dolomite or rhombohedral iron ore dry powder down, makes green-ball outside surface behind the water spray evenly wrap the antiplastering layer of 1～2mm thickness.After this, pass to second balling disc by belt and carry out the closely knit and screening of green-ball, form and make ball for the second time, this ball directly is transported to shaft furnace by belt and carries out roasting.Maturing temperature is controlled at 1050 ± 20 ℃, and roasting time is: 20～24 minutes; The pellet that roasting is good is transported to the stockyard and carries out air storage cooling process (can not drench with rain) more than 48 hours, sieves with vibratory screening apparatus then, and diameter is that the pellet of 6～16mm is delivered to iron work as finished ball.
Pelletizing dual alkalinity (the CaO/SiO that this production technique is produced
2) weight ratio about 1.0 ± 0.1, MgO content is not less than 2%.If improve the dual alkalinity of pelletizing, can when preparing burden for the first time, add limestone powder, add-on is determined by the dual alkalinity of setting.
Referring to Fig. 2, second embodiment is to use magnesia slaked lime to make flux, and the weight ratio of MgO content is controlled between 2～4% in the green-ball, CaO/SiO
2Weight ratio be controlled in 0.6～2.2 scope.Wrap up in acid fine iron breeze and bentonitic compound outward and carry out making the second time ball, carry out roasting according to acidic pellet ore required maturing temperature and time then, promptly non-caked between ball and the ball.Comprehensive dual alkalinity (the CaO/SiO of pelletizing after the roasting
2) in 0.6～1.3 scope.
Detailed process is: the wilkinite with 0.6%, 5% magnesia slaked lime, 10～14% ground dolomite, 80～84% acid fine iron breeze are prepared burden with electronic batching scale.Carry out making the first time ball as the same scheme of above-mentioned first embodiment.The diameter of making is to be transported to behind the green-ball of 6～15mm on the multiple roll sieve, sieves and the vaporific green-ball surface of spraying water.Be transported to second multigraph press then and make ball.Add acid fine iron breeze (water content is lower than 6%) and bentonitic compound or rhombohedral iron ore dry powder in the second time in the balling disk (-sc), this compound or rhombohedral iron ore dry powder are wrapped up in outside equably on the pelletizing outside surface of making for the first time in balling disk (-sc), finished and make ball for the second time.The gauge control of jacket layer is at 1～3mm.The pelletizing of making for the second time directly is sent to shaft roasting, and maturing temperature is controlled at 1050 ± 20 ℃, and roasting time is: 20～24 minutes; The pelletizing that roasting is good can directly be delivered to the iron work feed bin.
The present invention has carried out nearly time test enforcement surplus in the of ten, and the result of test is successful, has realized goal of the invention.
Claims (8)
1, a kind of production method of flux iron ore powder composite pellet is characterized in that: adopt and repeatedly make the two basicity composite fluxing agent pelletizings of ball mode manufacture order ball; Just making in the ball process for the first time, make and contain proper C aO and MgO in the green-ball, carry out making the second time ball then, skin wraps uniform antiplastering layer on the green-ball surface, adopt the maturing temperature and the roasting mode of acidic pellet ore to carry out roasting again, guarantee that pellet does not produce bonding; Described method comprises the steps:
(1) material is prepared, and wherein the proportioning of each moiety is all weight ratio:
A, fine iron breeze:
The basic iron fine ore: full iron TFe＞63%, wherein the impurity requirement is: SiO
2＜3%, CaO＜1%, MgO:2～4%, S＜0.02%, P＜0.02%; The smart powder degree of iron requires :-200 order screen underflow＞70%;
B, as the slaked lime of flux and tackiness agent:
Calcareous slaked lime: CaO＞65%, MgO＜3%, SiO
2＜4%;
Magnesia slaked lime: CaO＞39%, MgO＞31%, SiO
2＜2%;
C, as the limestone flour of flux and antiplastering layer:
Limestone powder: CaO＞50%, MgO＞1.9%, SiO
2＜2.4%, granularity requirements is :-200 order screen underflow＞50%;
Ground dolomite: CaO＞30%, MgO＞20%, SiO
2＜1.9%, granularity requirements is :-200 order screen underflow＞50%;
D, as the ground hematite of antiplastering layer: full iron TFe＞52%, wherein impurity require be: SiO
2＜10%, S＜0.08%, P＜0.1%; The ground hematite granularity requirements is :-200 order screen underflow＞40%;
(2) production technique:
Earlier with electronic batching scale following butt material is carried out batching: wilkinite is 0.6 ± 0.1%, calcareous slaked lime is 5～6%, and the basic iron fine ore is 93～94%;
After above-mentioned batching mixed, be transported to the transfer feed bin and stock, be transported to via the disk feeder under the transfer feed bin then and make ball in the balling disc, the diameter of green-ball requires to be 6～15mm;
The green-ball of making is transported to carries out twice processing on the multiple roll sieve: carry out vaporific water spray to green-ball earlier, and the following diameter of sieve is less than the green-ball of 5mm, again by the vibratory screening apparatus sieve of multiple roll sieve top down as butt limestone powder, ground dolomite or the ground hematite of antiplastering agent, make the green-ball surface behind the water spray evenly wrap the antiplastering layer that thickness is 1～2mm;
This green-ball being sent to second balling disc carries out closely knit and screening again, be delivered directly to shaft furnace then and carry out roasting, maturing temperature is: 1050 ± 20 ℃, roasting time is: 20～24 minutes, the pellet that roasting is good carries out naturally cooling to be handled, can not drench with rain when the air storage of stockyard, the time was not less than 48 hours; Screen with vibratory screening apparatus, finish whole operations, the diameter of finished ball nodulizing is 6～16mm.
2, the production method of flux iron ore powder composite pellet according to claim 1 is characterized in that: the composition of described antiplastering layer is limestone powder, ground dolomite or rhombohedral iron ore dry powder.
3, the production method of flux iron ore powder composite pellet according to claim 1 is characterized in that: make the dual alkalinity CaO/SiO that contains in the green-ball of ball the described first time
2Weight ratio between 0.5～2.0, the MgO weight ratio that contains is between 2～4%.
4, the production method of flux iron ore powder composite pellet according to claim 1 is characterized in that: the dual alkalinity CaO/SiO of the pellet that described production method is made
2Weight ratio be 1.0 ± 0.1, MgO content is greater than 2%.
5, the production method of flux iron ore powder composite pellet according to claim 1 is characterized in that: when with electronic batching scale the butt material being carried out batching, can add limestone powder, to improve the dual alkalinity of pellet; The weight ratio of the limestone powder that adds depends on the dual alkalinity of setting.
6, a kind of production method of flux iron ore powder composite pellet is characterized in that: adopt and repeatedly make the two basicity composite fluxing agent pelletizings of ball mode manufacture order ball; Just making in the ball process for the first time, make and contain proper C aO and MgO in the green-ball, carry out making the second time ball then, skin wraps uniform antiplastering layer on the green-ball surface, adopt the maturing temperature and the roasting mode of acidic pellet ore to carry out roasting again, guarantee that pellet does not produce bonding; Described method comprises the steps:
(1) material is prepared, and wherein the proportioning of each moiety is all weight ratio:
A, fine iron breeze:
Acid fine iron breeze: full iron TFe＞67%, wherein the impurity requirement is: SiO
2＜4%, MgO＜1.5%, S＜0.05%, P＜0.02%; The fine iron breeze granularity requirements is :-200 order screen underflow＞60%;
B, as the magnesia slaked lime of flux and tackiness agent: CaO＞39%, MgO＞31%, SiO
2＜2%;
C, as the ground dolomite of flux: CaO＞30%, MgO＞20%, SiO
2＜1.9%, granularity requirements is :-200 order screen underflow＞50%;
D, as the ground hematite of antiplastering layer: full iron TFe＞52%, wherein impurity require be: SiO
2＜10%, S＜0.08%, P＜0.1%; The ground hematite granularity requirements is :-200 order screen underflow＞40%;
(2) production technique:
Earlier with electronic batching scale following butt material is carried out batching: wilkinite is 0.6 ± 0.1%, magnesia slaked lime is 5 ± 1%, ground dolomite is 10～14%, and acid fine iron breeze is 80～84%;
After above-mentioned batching mixed, be transported to the transfer feed bin and stock, be transported to by the disk feeder under the transfer feed bin then and make ball in the balling disc, the diameter of green-ball requires to be 6～15mm;
The green-ball of making is transported on the multiple roll sieve sieves, sieve diameter down carries out vaporific water spray to green-ball simultaneously and handles less than the green-ball of 5mm; Send it to again on second balling disc, and add water content therein and be lower than 6% smart powder of acid iron and 1% wilkinite compound or rhombohedral iron ore dry powder, smart powder of this compound iron or rhombohedral iron ore dry powder are wrapped up on the surface of green-ball outside evenly in pelletizer, finish and make ball for the second time, this outer antiplastering layer thickness of wrapping up in is 1～3mm;
This green-ball of making directly is sent to shaft furnace and carries out roasting, and maturing temperature is: 1050 ± 20 ℃, roasting time is: 20～24 minutes; The feed bin that the pellet that roasting is good can directly be delivered to iron work carries out the naturally cooling processing, finishes whole operations.
7, the production method of flux iron ore powder composite pellet according to claim 6 is characterized in that: the composition of described antiplastering layer is the acid fine iron breeze of rhombohedral iron ore dry powder or low Si.
8, the production method of flux iron ore powder composite pellet according to claim 6 is characterized in that: the dual alkalinity CaO/SiO of the pellet that described production method is made
2Be (0.9～1.3) ± 0.1, MgO content is greater than 2%.
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