CN102978306A - Low-cost iron-making method capable of reducing reaction temperature in furnace - Google Patents
Low-cost iron-making method capable of reducing reaction temperature in furnace Download PDFInfo
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- CN102978306A CN102978306A CN2012104049249A CN201210404924A CN102978306A CN 102978306 A CN102978306 A CN 102978306A CN 2012104049249 A CN2012104049249 A CN 2012104049249A CN 201210404924 A CN201210404924 A CN 201210404924A CN 102978306 A CN102978306 A CN 102978306A
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Abstract
The invention relates to a low-cost iron-making method capable of reducing a reaction temperature in a furnace. The iron-making method employs a product processed by the following steps as a raw materials: mixing 50-70% of blast furnace return mine, 25-40% of coke powder or coal flour and 5-15% of an adhesive according to a proportion uniformly; adding water to stir; briquetting; mixing briquette, fuel and integrated iron materials; loading the mixture in the blast furnace for smelting. The iron-making method reduces the reaction temperature in the furnace during a blast furnace smelting process, reduces blast furnace smelting cost, and realizes economic and reasonable use of the blast furnace return mine.
Description
Technical field
The present invention relates to a kind of iron smelting method, relate in particular to a kind of method that reduces the low-cost ironmaking of reaction in furnace temperature.
Background technology
It is the target that smelter is pursued that high quality and low cost is smelted.At present, have following several problem in blast furnace ironmaking process, to be worth research:
The main body iron charge that the blast furnace such as agglomerate, pellet is smelted, it enters the stove granularity requirements more than 5mm.(agglomerate, pellet, lump ore etc. enter in the stove iron charge less than the 5mm part) need return sinter machine and again participate in re-using behind the sintering so return mine under the blast furnace, and the ratio of returning mine under the blast furnace is usually up to about 13%, although small part is because the ore deposit greater than 5mm that the screen cloth wearing and tearing are omitted out, these ore deposits can smelt by again being recovered into greater than the ore deposit of 5mm stove with screen cloth, and remaining major part is the slag less than 5mm, mostly returns sintering and makes agglomerate.Not only cause thus the problems such as sintering cost increase that the sinter machine utilization ratio descends, the increase of sintering burnup brings, have simultaneously more sinter return fine to participate in agglomerate easily efflorescence in stove of sintering, affect smooth operation of furnace.
Metallurgical coke plays a part very crucial in blast-furnace smelting as ironmaking reductive agent and blast furnace skeleton main body.But the metallurgical coke reactivity is low, limited the indirect reduction rate of blast furnace middle and upper part, makes that throat temperature is higher, fuel ratio is high, and the blast-furnace smelting cost increases.
Thus, be badly in need of developing the low-cost iron smelting method that reduces the reaction in furnace temperature.
Summary of the invention
For the problems of returning mine under the blast furnace and causing, contriver's independent development has designed a kind of method that reduces the low-cost ironmaking of reaction in furnace temperature.The method can solve preferably because returning mine under a large amount of blast furnaces and participate in the problem that sinter quality is poor and cost is high that sintering causes again, have the coal face of higher level of reactivity and new system finished product replacement part metallurgical coke and the iron charge that coke powder isoreactivity height, material cheap, that resource is sufficient generate by utilization simultaneously, thereby realization reduces the reaction in furnace temperature, reduces the purpose that coke ratio reduces the blast-furnace smelting cost, guarantees the blast furnace stable smooth operation.
The invention provides a kind of iron smelting method, comprise the steps:
(1) batching
To return mine under 50～70% the blast furnace, 25～40% coke powder and coal face, 5～15% binding agent mixes in proportion, and adds water and stirs, and forms mixed slurry;
(2) briquetting
The mixed slurry that step (1) is obtained utilizes the briquetting press briquetting;
(3) smelt
The pressing block that step (1) is obtained and is sent into blast furnace after fuel and comprehensive iron charge mix and is smelted.
Preferably, return mine under the described blast furnace, coke powder and coal face, the weight proportion of binding agent is: the 55-65% that returns mine under the blast furnace, most preferably 65%; Coke powder and coal face 30-35%, most preferably 30%; Binding agent 5-10%, most preferably 5%.
Preferably, the weight ratio 6～9:4 of described coke powder and coal face～1, preferred 7 ~ 8.5:3～1.5, most preferably 8:2.
Preferably, described binding agent is high-temperature cement, preferred pure calcium aluminate cement.
Preferably, described briquetting step is pressed into positive hexagonal prism with compound, or laterally the longitudinal cross-section is oval-shaped four jiaos of round and smooth squares.
Preferably, the carbon weight content of described pressing block is 18～35%, and full iron weight content is 28～40%.
Preferably, in the smelting process, the starting temperature of thermal storage band is 800-860 ℃ in the stove, medial temperature 890-900 ℃.
Preferably, the input part by weight of described pressing block is the 5-10% into the comprehensive iron charge of stove, preferred 8-10%, preferred 958%.
The invention still further relates to a kind of blast furnace iron, form by above-mentioned iron smelting method refining.
The advantage of iron smelting method of the present invention is:
1, reduces the temperature of reaction in the stove in the blast furnace ironmaking process.
2, reduce the blast-furnace smelting cost.
The economical rationality utilization of 3, returning mine under the realization blast furnace.
Description of drawings
Fig. 1 is that positive hexagonal prism that vertical brick pressing machine is pressed into contains the charcoal schematic perspective view of piece of returning mine of colding pressing.
Fig. 2 a be the approximate olive spheroid that is pressed into of pair roller brick pressing machine contain the charcoal front view of piece of returning mine of colding pressing.
Fig. 2 b be the approximate olive spheroid that is pressed into of pair roller brick pressing machine contain the charcoal vertical view of piece of returning mine of colding pressing.
Fig. 2 c be the approximate olive spheroid that is pressed into of pair roller brick pressing machine contain the charcoal side-view of piece of returning mine of colding pressing.
Embodiment
Be described in detail with following example as follows, yet, one skilled in the art will appreciate that protection scope of the present invention should not be confined to this.
Used raw material in the following embodiment, equipment etc. are the routine of this area and select.
Iron-smelting raw material of the present invention:
Return mine under the blast furnace: enter more than the stove mineral aggregate requirement granularity 5mm during owing to ironmaking, returning mine again to process as blast furnace less than the agglomerate of 5mm part, pellet, lump ore etc. just can enter blast furnace and use, and these need to be processed again to enter the granularity of blast-furnace smelting again be known as under the blast furnace less than agglomerate, pellet and the lump ore of 5mm and return mine.
Coke powder and coal face: coke powder and coal face, all as the ironmaking reductive agent, because therefore itself and the reactivity of the carbonic acid gas metallurgical coke greater than routine obtain use.The ash content of general coke powder is 11.5～13%, the fugitive constituent of coal face is 7～11%, the product that coke powder and coal face all adopt other techniques of place factory to recycle, the coke powder product is more single, and coal face product is abundanter, generally speaking, fugitive constituent is larger in the coal face, and cost is lower, but its briquetting intensity that is pressed into is lower, can affect the operational stability of blast-furnace smelting, increase cost in long-range angle again.Therefore, thus can control cost and the briquetting intensity that the adjustment of its volatile content smelts by the kind of selecting the coal face reaches optimum value.The part by weight of coke powder and coal face changes according to the value of the fugitive constituent of the ash content of coke powder and coal face, can choose preferred 7～8.5:3～1.5 in 6 ~ 9:4～1.When coal face fugitive constituent is 10%, when the coke powder ash content was 12%, the part by weight of coke powder and coal face is 8:2 most preferably.Reason is that the coke powder fugitive constituent is low, and the rear coal-tar middle oil content of coal gas of reaction seldom, and coal face fugitive constituent is higher, but the coal-tar middle oil content of coal gas increases after the reaction, so coal face proportioning is too high, is unfavorable for the normal operation of gas dust removal system.
Binding agent: binding agent uses high-temperature cement, i.e. high temperature resistant cement, optional pure calcium aluminate cement, for example super early strong aluminate cement of N-type.
Key equipment of the present invention:
Crusher, conveyor, belt electronic scale (being used for batching), mixer (being used for the material mixing), stirrer (being used for adding water stirs), vertical brick pressing machine or pair roller ball press (being used for briquetting).
The detailed process of ironmaking of the present invention:
(1) batching
This step is utilized under the blast furnace and is returned mine, coke powder and coal face, binding agent (high-temperature cement) with certain proportioning mixing after, add water and stir, be cold-pressed into piece.
Proportioning raw materials is: returning mine under the blast furnace accounts for 50%～70%, coke powder and coal face account for 25～40%(wherein the weight ratio of coke powder and coal face be 6～9:4～1, preferred 7 ~ 8.5:3～1.5, most preferably 8:2), binding agent (high-temperature cement) accounts for 5～15%.
(2) briquetting
Above-mentioned mixed slurry is utilized the briquetting press briquetting, carry out at normal temperatures the maintenance cooling curing and become to contain the charcoal piece of returning mine of colding pressing.
The briquetting finished product
1) trimmed size
1. when using vertical brick pressing machine, finished product is positive hexagonal prism, as shown in Figure 1.Hexagonal prism is good with respect to four prisms cylinder bight wear resistance and anti-crushing performance, but the rib number is too much, and the Mold Making cost increases.Because the desired furnace charge intensity of large blast furnace is high, preferred positive hexagonal prism, for example external diameter and the high hexagonal prism that is 40mm.
2. when using the pair roller ball press, finished product is approximate olive spheroid, as shown in Figure 2.The vertical brick pressing machine of pressure ratio of approximate olive spheroid pair roller ball press is little, and finished state must reduce the angle rib as far as possible, to improve its wear resistance and anti-crushing performance.Because the desired furnace charge intensity of small blast furnace is low, and the pressing cost of approximate olive spheroid is low and intensity still can, small blast furnace is approximate olive spheroid preferably, and for example horizontal longitudinal cross-section is the ellipse of major axis 40mm, minor axis 25mm, and bowing is seen as four jiaos of round and smooth squares that the length of side is 40mm.Such structure does not almost have corner angle, and the corner is not easy to come off, and is not again the standard rugby shape, therefore is not easy to roll.
2) finished product composition
Owing to add coke powder and coal face, comprise a certain amount of carbon in the finished product.Owing to add the iron charges such as agglomerate, pellet, comprise a large amount of iron in the finished product.In order to obtain better combustion efficacy, carbon, ferrous components in the preferred finished product meet following standard:
(3) smelt
With the pressing block after the above-mentioned maintenance, and send into blast furnace after fuel and comprehensive iron charge mix and smelt.
This carbon containing is colded pressing and is returned piece and can be used for all iron-smelting blast furnaces, and the condition of its blast-furnace smelting is with conventional consistent.When blast-furnace smelting, with comprehensive ore deposit, nut coke mixes the composition ore deposit and criticizes the adding steelmaking furnace, and coke adds blast-furnace smelting as coke (per) charge.This carbon containing additional proportion that returns piece of colding pressing can be 5～10%, and generally speaking, the amount of adding is larger, the cost of saving is more, and is more to the temperature reduction of the hot reserve band in the blast furnace, yet add-on is too high, can affect the direct motion of blast furnace, therefore return the additional proportion preferred 9.58% of piece.
Comprehensive ore deposit (comprising briquetting, agglomerate and pellet), cold pressing with carbon containing and to form the ore deposit after returning piece, nut coke and mixing and criticize and enter blast furnace and smelt, coke enters blast-furnace smelting as coke (per) charge, carries out blast-furnace smelting under the parameter of the air-supply air quantity of certain humidity, wind-warm syndrome, injecting coal quantity.The transitional zone of pressing block between furnace throat cloth position preferably is controlled in the limit, namely outer shroud gear with interior inferior outer shroud to time in the ring gear, for example conventional furnace charge ore gear is the 1-5 shelves, then pressing block cloth gear selects the 2-4 shelves to smelt.The feeding position that is pressing block keeps to the side a little, is not suitable for being placed on the limit or middle, and reason is in the middle of being placed on or the limit, affects smooth operation of furnace.
Beneficial effect
At first, the present invention has reduced smelting cost owing to take full advantage of returning charge under the blast furnace.Secondly, in the use procedure of this product, used coke powder and coal face and CO
2Reactivity greater than the reactivity of conventional metallurgical coke, after the product of cold-press moulding replaces part metallurgical coke and comprehensive iron charge and ore to be mixed into stove, with the CO in the coal gas
2The temperature that begins to react begins low 100 ℃～150 ℃ of temperature than the reaction that layer dress (volume particle size coke and ore layering are packed into) enters the stove metallurgical coke, (the heat absorption heat release position in a basic balance in the stove of thermal storage band in the stove, the temperature substantially constant is constant, centre near the blast furnace vertical height) starting temperature is 800-860 ℃, medial temperature 890-900 ℃, all lower than starting temperature and the medial temperature of existing methodical hot reserve band.Because coke powder and the coal face introduced have promoted C+CO
2The generation of → 2CO reaction, and this reaction is thermo-negative reaction, can reduce the temperature of Fu Shi body indirect reduction reaction in the blast furnace; reduce simultaneously the consumption of reductive agent; enlarge in the blast furnace between the CO high concentration region, and pack into the bulk metallurgical coke of stove of protective layer, reduce layer pack into stove metallurgical coke and CO
2The granularity of reaction decays, and guarantees the ventilative liquid permeability of bottom house coke stock column.
Embodiment (preparation test and performance evaluation experiment):
Embodiment 1
Utilize the belt electronic scale with the 500kg(50% that returns mine under the blast furnace), coke powder and coal face 400kg(40%) (the coke powder ash content is 12%, coal face fugitive constituent is 7%, wherein coke powder is 6:4 with the ratio of coal face), the super Zao by force aluminate cement of binding agent 100kg(N type, 10%) prepares burden, and bring the material for preparing into cylindrical mixer;
After utilizing cylindrical mixer that material is carried out mixing, be transported to steel basin by conveyor, add water and stir.Adding water yield mass ratio is 4% of compound total amount, when the finished product compound stalk forming is better, reduces amount of water as far as possible.
The stirring material that stirs is carried out briquetting with vertical brick pressing machine, and the product that is pressed into and specification be respectively such as Fig. 2 a, Fig. 2 b, and shown in Fig. 2 c, for horizontal longitudinal cross-section is the ellipse of major axis 40mm, minor axis 25mm, bowing is seen as four jiaos of round and smooth squares that the length of side is 40mm.Carry out at normal temperatures maintenance 2 days, be solidified into and contain the charcoal piece of returning mine of colding pressing.Then can enter stove uses.
The composition of the finished product that obtains is:
As shown in table 1 below, the add-on of pressing block accounts for 5% of comprehensive iron ore during smelting, and agglomerate accounts for 70% of comprehensive iron ore, and pellet accounts for 25% of comprehensive iron ore.
The briquetting of embodiment is sent into 1800m by 80 kg/tonnes of molten iron
3Blast furnace smelt, with the agglomerate of 1120 kg/tonnes of molten iron and 22 kg/tonnes of molten iron of pellet, nut coke amount of 400 kg/tonnes of molten iron, enter blast furnace after the mixing and smelt, with 307 kilograms of coke/ton molten iron layering blast-furnace smelting of packing into, air-supply air quantity 1000Nm
3/ ton molten iron hot blast, 1150～1250 ℃ of (humidity 15g/m of wind-warm syndrome
3), injecting coal quantity 202kg/ ton molten iron.The transitional zone of pressing block between furnace throat cloth position preferably is controlled in the limit, namely outer shroud gear with interior inferior outer shroud to time in the ring gear, for example conventional furnace charge ore gear is the 1-5 shelves, then pressing block cloth gear selects the 2-4 shelves to smelt.
The starting temperature of thermal storage band is 850～870 ℃ in the stove, 920 ℃ of medial temperatures.14.5 yuan/tons of costs.
Embodiment 2
Utilize the belt electronic scale with the 700kg(70% that returns mine under the blast furnace), coke powder and coal face 250kg(25%) (the coke powder ash content is 12%, coal face fugitive constituent is 11%, wherein coke powder is 9:1 with the ratio of coal face), the super Zao by force aluminate cement of binding agent 50kg(N type) (5%) prepare burden, and bring the material for preparing into cylindrical mixer;
After utilizing cylindrical mixer that material is carried out mixing, be transported to steel basin by conveyor, add water and stir; Adding water yield mass ratio is 6% of compound total amount, when the finished product compound stalk forming is better, reduces amount of water as far as possible.
The stirring material that stirs is carried out briquetting with vertical brick pressing machine, and the product that is pressed into and specification are positive hexagonal prism respectively as shown in Figure 1.
Carry out at normal temperatures maintenance was solidified into and contains the charcoal piece of returning mine of colding pressing in 4 days.Then can enter stove uses.
The composition of the finished product that obtains is:
As shown in table 1 below, the add-on of pressing block accounts for 7% of comprehensive iron ore during smelting, and agglomerate accounts for 73% of comprehensive iron ore, and pellet accounts for 20% of comprehensive iron ore.Except above ratio, the smelting step of this embodiment is consistent with embodiment 1.
The starting temperature of thermal storage band is 840～860 ℃ in the stove, 910 ℃ of medial temperatures.20.1 yuan/tons of costs.
Embodiment 3
Utilize the belt electronic scale with the 550kg(55% that returns mine under the blast furnace), coke powder and coal face 350kg(35%) (the coke powder ash content is 12%, coal face fugitive constituent is 8%, wherein coke powder is 7:3 with the ratio of coal face), the super Zao by force aluminate cement of binding agent 100kg(N type) (10%) prepare burden, and bring the material for preparing into cylindrical mixer;
After utilizing cylindrical mixer that material is carried out mixing, be transported to steel basin by conveyor, add water and stir; Adding water yield mass ratio is 8% of compound total amount, when the finished product compound stalk forming is better, reduces amount of water as far as possible.
The stirring material that stirs is carried out briquetting with vertical brick pressing machine, and the product that is pressed into and specification are positive hexagonal prism respectively as shown in Figure 1.
Carry out at normal temperatures maintenance was solidified into and contains the charcoal piece of returning mine of colding pressing in 3 days.Then can enter stove uses.
The composition of the finished product that obtains is:
As shown in table 1 below, the add-on of pressing block accounts for 8% of comprehensive iron ore during smelting, and agglomerate accounts for 72% of comprehensive iron ore, and pellet accounts for 20% of comprehensive iron ore.Except above ratio, the smelting step of this embodiment is consistent with embodiment 1.
The starting temperature of thermal storage band is 830～850 ℃ in the stove, 900 ℃ of medial temperatures.25.3 yuan/tons of costs.
Embodiment 4
Utilize the belt electronic scale with the 650kg(65% that returns mine under the blast furnace), coke powder and coal face 300kg(30%) (the coke powder ash content is 12%, coal face fugitive constituent is 10%, wherein coke powder is 8:2 with the ratio of coal face), the super Zao by force aluminate cement of binding agent 50kg(N type) (5%) prepare burden, and bring the material for preparing into cylindrical mixer;
After utilizing cylindrical mixer that material is carried out mixing, be transported to steel basin by conveyor, add water and stir; Adding water yield mass ratio is 8% of compound total amount, when the finished product compound stalk forming is better, reduces amount of water as far as possible.
The stirring material that stirs is carried out briquetting with vertical brick pressing machine, and the product that is pressed into and specification are positive hexagonal prism respectively as shown in Figure 1.
Carry out at normal temperatures maintenance was solidified into and contains the charcoal piece of returning mine of colding pressing in 2 days.Then can enter stove uses.
The composition of the finished product that obtains is:
As shown in table 1 below, the add-on of pressing block accounts for 9.58% of comprehensive iron ore during smelting, and agglomerate accounts for 71.14% of comprehensive iron ore, and pellet accounts for 19.28% of comprehensive iron ore.Except above ratio, the smelting step of this embodiment is consistent with embodiment 1.
The starting temperature of thermal storage band is 790～810 ℃ in the stove, 870 ℃ of medial temperatures.30.4 yuan/tons of costs, and blast furnace operating stability is fairly good.
Embodiment 5
Utilize the belt electronic scale with the 650kg(65% that returns mine under the blast furnace), coke powder and coal face 300kg(30%) the coke powder ash content is 12%, coal face fugitive constituent is 10.5%, wherein the weight ratio of coke powder and coal face is 8.5:1.5), the super early strong aluminate cement of binding agent 50kg(N type) (5%) prepare burden, and bring the material for preparing into cylindrical mixer;
After utilizing cylindrical mixer that material is carried out mixing, be transported to steel basin by conveyor, add water and stir; Adding water yield mass ratio is 8% of compound total amount, when the finished product compound stalk forming is better, reduces amount of water as far as possible.
The stirring material that stirs is carried out briquetting with vertical brick pressing machine, and the product that is pressed into and specification are positive hexagonal prism respectively as shown in Figure 1.Carry out at normal temperatures maintenance was solidified into and contains the charcoal piece of returning mine of colding pressing in 3 days.Then can enter stove uses.
The composition of the finished product that obtains is:
As shown in table 1 below, the add-on of pressing block accounts for 10% of comprehensive iron ore during smelting, and agglomerate accounts for 70% of comprehensive iron ore, and pellet accounts for 20% of comprehensive iron ore.Except above ratio, the smelting step of this embodiment is consistent with embodiment 1.
The starting temperature of thermal storage band is 810～830 ℃ in the stove, 890 ℃ of medial temperatures.25.7 yuan/tons of costs.
Reference examples
With 1280 kg/tonnes of molten iron of agglomerate, 320 kg/tonnes of molten iron of pellet, 22 kg/tonnes of molten iron of nut coke amount mix to add blast furnace and smelt, and with 326 kg/tonnes of molten iron layerings of coke blast-furnace smelting of packing into, smelting parameter is air-supply air quantity 1000Nm
3/ ton molten iron hot blast (humidity 15g/m
3), 1150～1250 ℃ of wind-warm syndrome, injecting coal quantity 202kg/ ton molten iron.The starting temperature of thermal storage band is 860-900 ℃ in the stove, and medial temperature is 950 ℃.
For the reinforced situation tabulation of the smelting of embodiment and reference examples contrast.
Table 1 reference examples and embodiment blast furnace use carbon containing to cold pressing and return mine the piece front and back relatively
Interpretation of result
As seen from the above table, embodiments of the invention 4 have greatly reduced the ratio of returning charge under the groove of wasting in the blast furnace as preferred embodiment, are down to 3.59% from 9.94.
Relatively can be drawn by above, use the blast furnace thermal storage band temperature of partial briquetting all low than reference examples in the various embodiments of the present invention, smelting cost also is significantly less than reference examples.And wherein, preferred method is embodiment 3, embodiment 4 and embodiment 5, take 55%～65% to return mine+the scheme batching of 30～35% coke powders and coal face+5～10% binding agents, briquetting reduces the blast furnace cost and reaches at least 25.3 yuan/tons, the briquetting intensity that finally obtains is suitable, be suitable for blast-furnace smelting and use, the part by weight with 8～10% is mixed into blast furnace, has reduced at least 110 ℃ for the starting temperature of hot reserve band in the blast furnace, medial temperature has reduced at least 50 ℃, has greatly saved cost.Most preferred method is embodiment 4, it adopts weight ratio is the coke powder of 8:2 and the fuel that coal face (fugitive constituent 10%) conduct adds, return mine+30% coke powder and coal face+5% binder making briquetting with 65%, part by weight with 9.58% is mixed into blast furnace, and can be found out that by upper table 1 greatly improved the waste of time returning mine, lower the returning mine of utilizing be not down to 3.59% by 9.94%, the starting temperature of hot reserve band has reduced by 160 ℃, and medial temperature has reduced by 80 ℃; Smelting cost reduces by 30.4 yuan/tons.
Implementation result
But technology economical rationality after the secret test of Taiyuan Iron and Steel Co. is implemented utilizes BF return fines, reduces the temperature of reaction in the stove in the blast furnace ironmaking process, thereby reduces the blast-furnace smelting cost, and is beneficial to the blast furnace stable smooth operation.
Through measuring and calculating, adapted 9.58%(accounts for the part by weight into the stove iron-containing charge in blast furnace ironmaking process) the cold pressing piece of returning mine of charcoal that contains replace part metallurgical coke and comprehensive iron ore, on average can reduce by 26.5 yuan/tons of iron of blast-furnace smelting cost.
Claims (9)
1. an iron smelting method is characterized in that, comprises the steps:
(1) batching
To return mine under 50～70% the blast furnace, 25～40% coke powder and coal face, 5～15% binding agent mixes in proportion, and adds water and stirs, and forms mixed slurry;
(2) briquetting
Above-mentioned mixed slurry is utilized the briquetting press briquetting;
(3) smelt
With pressing block, fuel and comprehensive iron charge, send into blast furnace after the mixing and smelt.
2. iron smelting method as claimed in claim 1 is characterized in that, return mine under the described blast furnace, and coke powder and coal face, the weight proportion of binding agent is: the 55-65% that returns mine under the blast furnace, most preferably 65%; Coke powder and coal face 30-35%, most preferably 30%; Binding agent 5-10%, most preferably 5%.
3. iron smelting method as claimed in claim 1 or 2 is characterized in that, the weight ratio 6～9:4 of described coke powder and coal face～1, preferred 7 ~ 8.5:3～1.5, most preferably 8:2.
4. such as each described iron smelting method of claim 1～3, it is characterized in that described binding agent is high-temperature cement, preferred pure calcium aluminate cement.
5. such as each described iron smelting method of claim 1～4, it is characterized in that described briquetting step is pressed into positive hexagonal prism with compound, or laterally the longitudinal cross-section is oval-shaped four jiaos of round and smooth squares.
6. such as each described iron smelting method of claim 1～5, it is characterized in that the carbon weight content of described pressing block is 18～35%, full iron weight content is 28～40%.
7. such as each described iron smelting method of claim 1～6, it is characterized in that in the smelting process, the starting temperature of thermal storage band is 800-860 ℃ in the stove, medial temperature 890-900 ℃.
8. such as each described iron smelting method of claim 1～7, it is characterized in that the input part by weight of described pressing block is the 5-10% into the comprehensive iron charge of stove, preferred 8-10%, preferred 9.58%.
9. a blast furnace iron forms by each described iron smelting method refining of claim 1-8.
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