CN103194558A - Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide - Google Patents
Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide Download PDFInfo
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- CN103194558A CN103194558A CN2013101192860A CN201310119286A CN103194558A CN 103194558 A CN103194558 A CN 103194558A CN 2013101192860 A CN2013101192860 A CN 2013101192860A CN 201310119286 A CN201310119286 A CN 201310119286A CN 103194558 A CN103194558 A CN 103194558A
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Abstract
The invention relates to a method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide. The method comprises the following steps in sequence: I, preparing the block masses from the iron ore; II, distributing the material; III, smelting; and IV, tapping. The method is characterized in that material distribution in the step II comprises the following substeps: mixing the prepared block masses with coke, limestone and dolomite, and then adding to an iron-making furnace; the smelting in the step III is to control the pre-reducing degree of the iron ore block masses, change the reducing atmosphere of a shaft furnace, control the content of FeO in slag within 2.5%-8%, control the binary basicity within 0.8-1.0, control the content of sulfur in the molten iron within 0.05%-0.3%, control the temperature of the molten iron to be 1450 DEG C or below 1450 DEG C, and control the content of the molten iron Si to be 0.2% or less than 0.2%. According to the method for smelting the molten iron disclosed by the invention, the production cost of the molten iron is low, the production process is simple, and the contents of Si and the phosphorus in molten iron are low.
Description
Technical field
The present invention relates to a kind of method with high-phosphorus iron ore powder, high aluminium sesquioxide powdered iron ore smelting molten iron, specifically be with the high-phosphorus iron ore powder and contain the method for high aluminium sesquioxide powdered iron ore smelting molten iron.Phosphorus content≤0.3% in the high-phosphorus iron ore powder wherein, aluminium sesquioxide≤3%.
Background technology
In recent years, increasing to the demand of iron ore along with Iron And Steel Industry continues growth at a high speed, and the quality of iron ore also proposed higher requirement.Present blast furnace smelting process requires the iron grade to want high, SiO to feed stock for blast furnace
2, Al
2O
3Content is low, and phosphorus, sulphur impurity content are also low.Because iron is of high grade, SiO
2When content hangs down, be conducive to improve the capacity factor of a blast furnace, voluminous molten iron; If go into furnace charge Al
2O
3The content height, the Al of slag
2O
3Content raises, and can cause the slag fluidity variation, is unfavorable for that slag iron separates, and also is unfavorable for slag desulfurization; And for the content of phosphorus, require lowly as far as possible especially, because blast furnace production technique routinely, the phosphorus in the raw material substantially all enters in the molten iron under the reducing atmosphere of blast furnace, causes very big difficulty for follow-up steel making working procedure.More tired fiber crops be because the molten iron silicon content height that conventional blast furnace technology is produced, generally between 0.4%-0.8%.Steel making working procedure wants dephosphorization, at first need the Si in the molten iron is removed to below 0.2%, and then carry out dephosphorization (because the binding ability of Si and oxygen is far longer than the binding ability of phosphorus and oxygen, thus silicon than phosphorus preferential oxidation, the SiO of formation
2Can reduce the basicity of slag greatly, and in order to reduce the dephosphorizing agent consumption, to improve dephosphorization efficient, must be in advance with the molten iron silicon oxidation to a certain degree), therefore to the back steel making working procedure, require the Si of molten iron, phosphorus content low as far as possible.Therefore, for Al
2O
3Content height, the ore that phosphorus content is high, blast furnace are few adapted or adapted not basically.
Although the huge Al of reserves is arranged at present both at home and abroad
2O
3Content height, the rhombohedral iron ore that phosphorus content is high, but because there not being feasible dephosphorizing technology rationally, effectively exploited utilization.Former studies personnel have also developed the technology of dephosphorization by mineral processing, rationally to utilize this partly iron ore, these technology are mainly as follows: the one, and the beneficiating method dephosphorization, beneficiation method often needs finely ground ore to phosphorus ore thing and iron mineral to dissociate fully, adopts magnetic method or flotation process to carry out sorting then.But high-phosphorus iron ore mineral composition more complicated, phosphorus ore thing disseminated grain size is thinner, and adopt the beneficiation method dephosphorization to have following problem: 1. dephosphorization rate is low; 2. because fine grinding has reduced the treatment capacity of ball mill, the ore grinding cost is obviously increased; 2. the iron loss vector is big.Therefore, traditional beneficiation method is difficult to reach gratifying effect.The 2nd, the chemical method dephosphorization.The chemical process dephosphorization carries out the acidleach dephosphorization with nitric acid, hydrochloric acid or sulfuric acid to ore exactly.This method is a kind of comparatively effectively dephosphorizing method, and phosphorus ore thing monomer dissociation fully in the ore, can reach the purpose of falling phosphorus as long as come out just to contact with leach liquor.But chemical process dephosphorization acid consumption is big, cost is high, and causes soluble iron mineral dissolution in the ore easily, causes the loss of iron.The 3rd, microorganism dephosphorization method.The microorganism dephosphorization mainly is the pH value of producing sour reduction system by metabolism, makes the dissolving of phosphorus ore thing, and the acid of metabolism simultaneously also can form complex compound, thereby promotes the dissolving of phosphorus ore thing.But this method long processing period, and be in conceptual phase at present.Therefore, though fall at iron ore at present and obtained very big progress aspect the phosphorus, make the phosphorus content of high-phosphorus iron ore obtain to a certain degree reduction, but generally speaking also exist a lot of problems, want to produce the powdered iron ore that phosphorus content can satisfy conventional smelting technology requirement fully by the mineral processing technology, also relatively more difficult at present.
External Australia is for utilizing the high rhombohedral iron ore stone of western Australia phosphorus content, developed the Hismelt technology, this method sprays into high phosphorus (about phosphorus content 0.1%) powdered iron ore, coal dust and hot blast at a high speed simultaneously simultaneously carries out pyroreaction in the molten bath, because the more conventional shaft furnace iron-smelting process of oxidizing atmosphere in the molten bath is eager to excel, therefore realized the production of low silicon, low-phosphorous molten iron.But this method technology is complicated, investment is high, lining erosion is serious, and the normal phase of being unrealized at present, stable suitability for industrialized production are used.
Summary of the invention
Above-mentioned deficiency for the method that overcomes existing high phosphorus, high aluminium sesquioxide powdered iron ore smelting molten iron, the invention provides the method for a kind of high phosphorus, high aluminium sesquioxide powdered iron ore smelting molten iron, this smelting process can be used the shaft furnace process of smelting molten iron, it is low to have the molten iron production cost, production technique is simple, molten iron Si content, the characteristics that phosphorus content is low.
Design of the present invention is: by adjusting the operating duty of shaft furnace, reduce the height of prereduction section less than 3m, guarantee the ventilation property of shaft furnace; Reduce the reductive agent consumption, reduce below the molten iron temperature to 1450 ℃, slag FeO content is greater than 1.5%, calcium oxide and silicon-dioxide ratio are less than 1.0 in the slag, the prereduction degree of control powdered iron ore nodulizing changes the reducing atmosphere of shaft furnace, smelts low silicon, low-phosphorous molten iron.
The method of this high phosphorus, high al2o3 powdered iron ore smelting molten iron comprises following sequential steps: I powdered iron ore briquetting piece, II cloth, III are smelted, IV is tapped a blast furnace, it is characterized in that: described II cloth is the agglomerate that will make with after coke, Wingdale, rhombspar mix, and generally adds volume less than 100m
3Iron-smelting furnace be shaft furnace; It is the prereduction degree of (by adjusting the operating duty of shaft furnace) control powdered iron ore agglomerate that described III is smelted, change the reducing atmosphere of shaft furnace, FeO content in the slag is controlled at 2.5%-8%, control slag dual alkalinity is 0.8-1.0, sulphur content control is at 0.05%-0.3% in the molten iron, molten iron temperature control is below 1450 ℃ or 1450 ℃, and molten iron Si content is less than 0.2%.
Need not to implement the outer desiliconization of stove and can directly implement the extra furnace dephosphorization technology, smelt low silicon, low-phosphorous molten iron at last.
The steps characteristic of the method for this high phosphorus, high aluminium sesquioxide powdered iron ore smelting molten iron is:
IPowdered iron ore briquetting
Through crusher in crushing, particle diameter is not more than 3mm to a with powdered iron ore;
The requirement of high phosphorus, high aluminium sesquioxide powdered iron ore:
TFe ≥45%； SiO
2 ≤10%； MgO≤ 5%；Al
2O
3≤3%； P ≤ 0.3%； S ≤0.1%；
The above-mentioned mass percent that is.
B calculates the quality standard ratio of powdered iron ore and coke powder according to the ratio (mol ratio) 1.2-1.0 of oxygen in charcoal and the powdered iron ore.
C adds the coke powder that particle diameter is not more than 3mm according to the powdered iron ore of calculating and the mass ratio of coke powder, and powdered iron ore is mixed with coke powder; The per-cent of the quality that adds is 10%～30%.(being that coke powder is the percentage ratio of powdered iron ore and coke powder total amount)
D adds water, is pressed into the agglomerate of 20～30mm through twin rollers;
E is with agglomerate oven dry or natural air drying.(water content is less than 2.0%)
IICloth:
The agglomerate that makes with after coke, Wingdale, rhombspar mix, is added in the shaft furnace, and the mass ratio of above-mentioned four kinds of raw materials is:
Agglomerate 1000-1600; Coke 500～700;
Wingdale 100～300; Rhombspar 20～50;
IIIShaft furnace is smelted and is adjusted operating duty
Molten iron temperature control is at 1350 ℃～1450 ℃, in the molten iron silicone content will be reduced to≤0.2%, the molten iron phosphorus content is controlled below 0.1%.
IVTap a blast furnace
Smelt through shaft furnace, the phosphorus that raw material is brought into 〉=30% enters slag and can tap a blast furnace.
VSlag tap
Al in the slag
2O
3Reach more than 17%, as Al in the slag among the embodiment one
2O
3Reach 23.74%, still can normally slag tap.
Can realize control to phosphorus content in the control of molten iron silicon content and the molten iron by adjusting sulphur content in FeO content in the slag, control slag dual alkalinity and the molten iron.
Utilize smelting process of the present invention to handle high phosphorus, high Al
2O
3Powdered iron ore, the slag during because of the ironmaking of the more conventional shaft furnace process of FeO content in the slag wants high, and slag has certain silicon, dephosphorizing capacity of falling, so the silicone content of molten iron is lower than conventional shaft furnace process, and a part of phosphorus enters slag, thereby has reduced the phosphorus content of molten iron; Because of FeO content height in the slag, slag fluidity is good simultaneously, therefore can be with the Al in the slag
2O
3The upper limit is loosened to more than 17%.The slag dual alkalinity is low in addition, and slag desulfurization capacity is poor, causes in the molten iron sulphur content higher relatively, is conducive to improve the molten iron flowability on the contrary, and this just can also be conducive to reduce molten iron Si content with molten iron temperature control at lower level.Therefore present method is specially adapted to handle high phosphorus, high Al
2O
3Powdered iron ore or other iron-bearing material.In addition to conventional phosphorus content, conventional Al
2O
3The powdered iron ore of content or other iron-bearing material adopt present method, also are conducive to reduce the phosphorus content in the molten iron.
Handle high phosphorus, high Al with smelting process of the present invention
2O
3The beneficial effect of powdered iron ore: (1) keeps higher FeO content in the slag, improves the oxidation capacity of slag, can solve the high technical barrier of molten iron silicon content height, phosphorus content that conventional shaft furnace process runs into to a certain extent; (2) slag FeO content height, slag fluidity is improved, the molten steel sulfur content height, molten iron is mobile to be improved, and can implement high Al like this
2O
3Slag is smelted, and can also urge to demonstrate,prove the flowability of slag, has solved when conventional shaft furnace process is smelted iron to smelt high Al
2O
3The difficult problem of slag; (3) smelting process provided by the invention is applicable to and handles high phosphorus, high Al
2O
3Powdered iron ore or other high phosphorus, high Al
2O
3Iron content dedusting ash etc. thought the waste that is difficult to utilize in the past.(4) smelting process of the present invention also is applicable to rule phosphorus content commonly used, conventional Al
2O
3The powdered iron ore of content and other iron-bearing material are smelted low-phosphorous molten iron.
Embodiment
Further specify the specific embodiment of the present invention below by embodiment, but the specific embodiment of the present invention is not limited to following examples.
Benchmark embodiment 1
Present embodiment uses high phosphorus, high Al
2O
3Powdered iron ore adopts conventional shaft furnace process to produce molten iron.
The concrete steps of present embodiment are as follows:
(1) powdered iron ore briquetting:
High phosphorus, high Al
2O
3Powdered iron ore is broken extremely-3mm through crusher, adds 15% coke powder again, is pressed into the agglomerate of 20-30mm through twin rollers.
High phosphorus and high Al
2O
3In the powdered iron ore, TFe, FeO, SiO
2, Al
2O
3, CaO, MgO, P, S weight percent be: TFe 62.3%; FeO 28.193 SiO
25.1%; CaO 0.6%; MgO 0.5%; Al
2O
32.2%; P 0.08%; S 0.027%;
(2) burden structure and cloth:
The agglomerate that makes with after coke, Wingdale, rhombspar mix, is added in the shaft furnace:
Agglomerate 1538kg coke 880kg;
Wingdale 256kg; Rhombspar 58kg.
(3) red-tape operati system
By adjusting operating duty, at 1480 ℃, the control of FeO content is 0.9% in the slag with molten iron temperature control, and control slag dual alkalinity is 1.15, and sulphur content control is 0.03% in the molten iron.
(4) tap a blast furnace
Under above-mentioned process system, Si content is below 0.45% in the molten iron, and the molten iron phosphorus content is 0.147%, and phosphorus content is trace in the slag, and the phosphorus that raw material is brought into all enters in the molten iron at last.Al in the slag
2O
3Content is quite high, is 20.42%, and slag fluidity is very poor.
For ease of further comparison, table 1 is listed the leading indicator of slag and molten iron.
Table 1 molten iron and slag leading indicator
The embodiment of the invention 1
Present embodiment adopts method of the present invention to handle high phosphorus and high Al
2O
3Powdered iron ore.
The concrete steps of present embodiment are as follows:
IPowdered iron ore briquetting:
High phosphorus, high Al
2O
3Powdered iron ore is broken extremely-3mm through crusher, adds 15% coke powder (accounting for the percentage ratio of powdered iron ore and coke powder sum) again, is pressed into the agglomerate of 20-30mm through twin rollers.
Wherein high phosphorus, high Al
2O
3TFe, FeO, SiO in the powdered iron ore
2, Al
2O
3, CaO, MgO, P, S weight percent identical with aforementioned benchmark embodiment 1.
IIBurden structure and cloth:
The agglomerate that makes with after coke, Wingdale, rhombspar mix, is added in the shaft furnace:
Agglomerate 1496kg coke 830kg;
Wingdale 157kg; Rhombspar 43kg.
IIIShaft furnace is smelted
By adjusting the operating duty of shaft furnace, FeO content in the slag is controlled 3.5%.Control slag dual alkalinity is 0.8, and sulphur content 0.28% in the molten iron, and Si content is 0.2% in the molten iron, and molten iron temperature is controlled at 1450 ℃, and the molten iron phosphorus content is controlled below 0.1%.
IVTap a blast furnace
Smelt through shaft furnace, phosphorus content is 0.18% in the slag, and phosphorus 43.6% part that raw material is brought into enters in the slag.
VSlag tap
Al in the slag
2O
3Content is quite high, be 23.74%, but slag fluidity is better.
For ease of further comparison, table 2 is listed the leading indicator of slag and molten iron.
Table 2 molten iron and slag leading indicator
The embodiment of the invention 2
The concrete steps of present embodiment are as follows:
IPowdered iron ore briquetting
Step is with embodiment 1,
IIBurden structure and cloth:
With embodiment 1
IIIShaft furnace is smelted
By adjusting the operating duty of shaft furnace, 5.1%, control slag dual alkalinity is 0.8 with FeO content control in the slag, sulphur content control is 0.26% in the molten iron, Si content 0.12% in the molten iron, molten iron temperature is controlled at 1430 ℃, and the molten iron phosphorus content is controlled below 0.1%.
IVTap a blast furnace
Smelt through shaft furnace, phosphorus content is 0.21% in the slag, and the phosphorus that raw material is brought into enters in the slag more than 51%.
VSlag tap
Al in the slag
2O
3Content is quite high, be 23.6%, but slag fluidity is better.For ease of further comparison, table 3 is listed the leading indicator of slag and molten iron.
Table 3 molten iron and slag leading indicator
This shows, smelt high phosphorus, high Al with existing smelting process
2O
3Iron ore is produced molten iron, and the phosphorus in the raw material all enters molten iron, is 0.147%, and phosphorus content is quite high.And the embodiment of the invention 1 is compared with benchmark embodiment 1, after adopting smelting process of the present invention, the FeO content of slag is brought up to 3.5% by 0.9%, the slag dual alkalinity adjusts to 0.8 by 1.15, molten iron temperature is reduced to 1450 ℃ by 1480 ℃, and after molten steel sulfur content brings up to 0.28% by 0.03%, Si content will be reduced to 0.2% by original 0.45% in the molten iron, the molten iron phosphorus content also is reduced to 0.08% by original 0.147%, and the phosphorus that raw material is brought into 43.6% enters in the slag.
And inventive embodiments 2 is compared with benchmark embodiment 1, after adopting smelting process of the present invention, the FeO content of slag is further brought up to 5.1% by 3.5%, molten iron temperature is reduced to 1430 ℃ by 1450 ℃, after molten steel sulfur content is reduced to 0.26% by 0.28%, Si content will further be reduced to 0.12% by original 0.2% in the molten iron, and the molten iron phosphorus content is reduced to 0.069% by original 0.08%, and the phosphorus that raw material is brought into 51% enters in the slag.
Illustrate:
The powdered iron ore of present specification is the high-phosphorus iron ore powder and also is high aluminium sesquioxide powdered iron ore.
Claims (2)
1. method with high phosphorus, high aluminium sesquioxide powdered iron ore smelting molten iron, it comprises following sequential steps:
IPowdered iron ore briquetting piece,
IICloth,
IIISmelt,
IVTap a blast furnace, it is characterized in that: be described
IICloth is the agglomerate that will make with after coke, Wingdale, rhombspar mix, and adds iron-smelting furnace; Described
IIISmelting is the prereduction degree of control powdered iron ore agglomerate, change the reducing atmosphere of shaft furnace, FeO content in the slag is controlled at 2.5%-8%, control slag dual alkalinity is 0.8-1.0, sulphur content control is 0.05%-0.3% in the molten iron, molten iron temperature control is below 1450 ℃ or 1450 ℃, and molten iron Si content is 0.2% or less than 0.2%.
2. high phosphorus according to claim 1, high Al
2O
3The method of powdered iron ore smelting molten iron, its steps characteristic is:
IPowdered iron ore briquetting:
High phosphorus, high Al
2O
3Powdered iron ore is broken extremely-3mm through crusher, adds 10%-30% coke powder again, is pressed into the agglomerate of 20-30 mm through twin rollers;
TFe, SiO in high phosphorus, the high al2o3 powdered iron ore
2, Al
2O
3, CaO and MgO weight percent be:
TFe ≥45%； SiO
2 ≤10%； MgO≤ 5%；Al
2O
3≤3%； P ≤ 0.3%； S ≤0.1%；
IICloth:
According to the ratio of coke powder in the agglomerate, add coke, Wingdale and rhombspar during cloth again;
IIIAdjust operating duty
By adjusting operating duty, the prereduction degree of control agglomerate, FeO content in the slag is controlled 2.5%-8%, control slag dual alkalinity is 0.8-1.0, below the molten iron silicon content 0.2% or 0.2%, sulphur content control is 0.05%-0.3% in the molten iron, and molten iron temperature is controlled below 1450 ℃ or 1450 ℃, and the molten iron phosphorus content is controlled below 0.1%;
IVTap a blast furnace
By the adjustment of above-mentioned process system, the phosphorus that raw material is brought into enters slag more than 30%;
V is slagged tap.
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| CN2013101192860A CN103194558A (en) | 2013-04-09 | 2013-04-09 | Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313229A (en) * | 2014-10-30 | 2015-01-28 | 武汉钢铁(集团)公司 | Method for manufacturing high-phosphorus iron by using shaft furnace to directly reduce high phosphorus ore |
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| CN101654738A (en) * | 2009-09-15 | 2010-02-24 | 山西太钢不锈钢股份有限公司 | Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material |
| 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 |
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2013
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| US3985546A (en) * | 1974-12-23 | 1976-10-12 | Ford Motor Company | Method of fluidizing acid cupola slag |
| CN1904080A (en) * | 2006-08-10 | 2007-01-31 | 武汉科技大学 | Dephosphorus iron extraction production method of oolitic high phosphorus red iron ore |
| CN101654738A (en) * | 2009-09-15 | 2010-02-24 | 山西太钢不锈钢股份有限公司 | Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313229A (en) * | 2014-10-30 | 2015-01-28 | 武汉钢铁(集团)公司 | Method for manufacturing high-phosphorus iron by using shaft furnace to directly reduce high phosphorus ore |
| CN104313229B (en) * | 2014-10-30 | 2016-08-24 | 武汉钢铁(集团)公司 | The method producing high ferrophosphorus with shaft kiln directly reduced high phosphorus ore |
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Application publication date: 20130710 |