CN103409616B - Method for inhibiting low-temperature reduction degradation of sintering ore of iron ore - Google Patents

Method for inhibiting low-temperature reduction degradation of sintering ore of iron ore Download PDF

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CN103409616B
CN103409616B CN201310400501.4A CN201310400501A CN103409616B CN 103409616 B CN103409616 B CN 103409616B CN 201310400501 A CN201310400501 A CN 201310400501A CN 103409616 B CN103409616 B CN 103409616B
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iron ore
iron
granulating
temperature reduction
sintering
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CN103409616A (en
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姜涛
李光辉
张元波
余正伟
饶明军
郭宇峰
范晓慧
陈许玲
杨永斌
李骞
许斌
黄柱成
朱忠平
游志雄
曾精华
罗骏
刘臣
刘明霞
周峰
欧阳崇钟
刘兵兵
苏子键
徐斌
甘敏
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Central South University
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Abstract

The invention discloses a method for inhibiting the low-temperature reduction degradation of a sintering ore of an iron ore. The method comprises the following steps of: preparing an iron ore concentrate into a granulating material with certain granularity; mixing the granulating material with a sintering mixing material; and then distributing, sintering and roasting the mixture, wherein the negative pressure of air draft in the sintering and roasting process is decreased and the cooling speed of the sintering ore is slowed by adding a small amount of fusing agent or solid fuel is added into the granulating material and optimizing the usage amount of the solid fuel and the fusing agent in the sintering mixing material. Thus, the low-temperature reduction degradation of the sintering ore is obviously inhibited. As a result, the technical and economical index of blast furnace smelting is effectively improved.

Description

A kind of method suppressing iron ore sintering mine low temperature reduction degradation
Technical field
The invention discloses a kind of method suppressing iron ore sintering mine low temperature reduction degradation, belong to technical field of ferrous metallurgy.
Background technology
The cryogenic reducting powder index of iron ore sintering mine is one of important indicator weighing its metallurgical performance quality, makes a significant impact the ventilation property of stock column in blast furnace, whether is related to the direct motion of blast fumance.The reason that agglomerate produces low temperature reduction degradation is that in reduction process, be transformed into the magnetite of tesseral system by the rhombohedral iron ore of trigonal system, cell volume expands containing a large amount of secondary rhombohedral iron ore, particularly skeleton crystal shape diamond-type haematite in agglomerate.Because Sinter Component is complicated, each thing phase expansion character has very big-difference, thus causes producing great crushing stress in agglomerate, and agglomerate is cracked.Along with further developing of reduction, the reduction of more rhombohedral iron ore, crackle agglomerate Medium Culture expansion towards periphery, the more rhombohedral iron ore being exposed to crackle wall are reduced, and crackle is further developed.The final efflorescence degree of agglomerate is decided by size and the distribution of the content of Binder Phase in agglomerate, intensity and hole, and when crack growth can not get the enough bufferings of Binder Phase in agglomerate and absorbs, its efflorescence degree can continue aggravation.Otherwise the development of crackle is restricted, and efflorescence is inhibited.
Therefore, the rhombohedral iron ore content in agglomerate is reduced, the especially content of skeleton crystal shape diamond-type haematite; Improving liquid phase growing amount, especially high-quality liquid phase growing amount in sintering process, is the essential measure suppressing agglomerate low temperature reduction degradation; Meanwhile, Sinter Component also has significant impact to its low temperature reduction degradation.
Adopt the method for joining ore deposit to regulate the research of Sinter Component to show, FeO Content in Sinter often increases by 1%, RDI + 3.15improve 3.5%; SiO 2content often increases by 1%, RDI + 3.15improve 1.46%; CaO content often increases by 1%, RDI + 3.15improve 4%; Al 2o 3content often increases by 0.1%, RDI + 3.15reduce by 1.1%; TiO 2content increases, RDI + 3.15improve, but TiO 2during >15%, RD i+3.15reduce.Therefore, regulate and control to suppress the low temperature reduction degradation of agglomerate to be considered to effective measures by Sinter Component.But regulating the measure of Sinter Component to be subject to resource provision by joining ore deposit, joining the restriction of ore deposit cost etc., be difficult to realize.
At present, in the industrial production, mostly adopt to agglomerate surface sprinkling muriate (as CaCl 2, MgCl 2deng) solution suppresses agglomerate low temperature reduction degradation.But the chlorine that muriate is brought into when blast-furnace smelting can reduce coke strenth and ore softening temperature, destroys Wall of Blast Furnace, corrode gas line and hotblast stove, brings serious negative impact to blast fumance; Meanwhile, the chlorine entering air with flue gas can produce serious problem of environmental pollution.Therefore, spray muriate suppress the measure of agglomerate low temperature reduction degradation more and more not to be produced accept, urgently develop method that is new, effective suppression iron ore sintering mine low temperature reduction degradation.
Along with the day by day exhaustion of high-quality iron ore deposit, the raw material sources become increasingly complex make agglomerate low temperature reduction degradation problem be on the rise, and are greatly degrading the technico-economical comparison of blast-furnace smelting.Therefore, research and development suppresses the method for the low temperature reduction degradation of agglomerate to seem particularly important and urgent.
Summary of the invention
For solving the technical barrier that iron ore sintering mine low-temperature reduction disintegration can differ from, this invention exploits a kind of method that can suppress iron ore sintering mine low temperature reduction degradation, can unusual effect be had to improving agglomerate low-temperature reduction disintegration.
For achieving the above object, technical scheme of the present invention is:
A kind of method suppressing iron ore sinter low temperature reduction degradation, it is characterized in that, add limestone powder or ground dolomite or pulverized anthracite in iron-bearing material in raw materials for sintering and be prepared into the granulation material that granularity is 3mm ~ 15mm, then granulation material is added in sinter mixture and mix, bake with agglomeration, wherein granulation material adds proportioning and is again: material of granulating: sinter mixture=(20 ~ 60): (40 ~ 80);
The granularity <0.2mm of described limestone powder or ground dolomite, addition are 0.1% ~ 1.0% of material total mass of granulating; The granularity <0.1mm of described pulverized anthracite, addition account for 0.2% ~ 1.0% of material total mass of granulating;
Described suction pressure of baking with agglomeration controls as 8kPa ~ 9kPa, and cooling vacuum cavitations is 3kPa ~ 4kPa, controls cooling time as 6min ~ 10min.
Described iron-bearing material is the iron ore concentrate of granularity <0.1mm.
Fe in described iron-bearing material 3o 4mass content when being greater than 70%, pellet preparation process processed adds and accounts for material total mass 0.1% ~ 1.0% of granulating, the limestone powder of granularity <0.2mm or ground dolomite; As Fe in iron-bearing material 2o 3mass content when being greater than 70%, pellet preparation process processed add accounting for material total mass 0.2% ~ 1.5% of granulating, granularity is the pulverized anthracite of 0.045mm ~ 0.1mm.
Fe in described iron-bearing material 3o 4when mass content is 77%, limestone powder addition accounts for 1% of material total mass of granulating; Fe in described iron-bearing material 3o 4when mass content is 90%, ground dolomite addition accounts for 1% of material total mass of granulating; Fe in iron-bearing material 2o 3when mass content is 95%, pulverized anthracite addition accounts for 0.75% of material total mass of granulating.
6mm ~ 10mm grade mass content >60% in described granulation material granularity.
Described sinter mixture is made up of powdered iron ore, solid fuel, flux and returning mine, wherein powdered iron ore, solid fuel and flux are in mass ratio (75 ~ 85): (6 ~ 9): (10 ~ 16) coordinate, and consumption of returning mine is 30% ~ 50% of powdered iron ore, solid fuel and flux total mass.Describedly to return mine as return mine (iron ore sintering is returned mine) of step of baking with agglomeration.
Described suction pressure of baking with agglomeration is 9kPa, and cooling negative pressure is 4kPa, and cooling time is 8min.
Below the present invention be further explained and illustrate:
Principle of the present invention is:
The invention discloses a kind of method suppressing iron ore sintering mine low temperature reduction degradation, by iron ore concentrate being prepared into coarse grain granulation material, then mixing with sinter mixture, then baking with agglomeration on sinter machine; By improving solid fuel consumption and basicity in sinter mixture, reduce bake with agglomeration suction pressure and agglomerate speed of cooling, blast furnace burden low temperature reduction degradation is obviously suppressed, effectively can improve the technico-economical comparison of blast-furnace smelting, specifically have employed following technical measures:
First, the particulate raw material in iron-bearing material is prepared into coarse grain granulation material by the present invention, then bakes with agglomeration together with sintered material, and can make to produce a certain amount of low melting point liquid phase in granulation material, pellet strength processed improves.In addition, with Fe 3o 4add limestone powder in iron ore concentrate for main ferriferous oxide, its Binder Phase is converted into kirschsteinite, monticellite by fayalite, and intensity and reductibility all improve; With Fe 2o 3for adding pulverized anthracite in the iron ore concentrate coarse particles of main ferriferous oxide, wherein Fe 2o 3recrystallize consolidation change Fe into 2o 3first Fe is reduced into 3o 4, and then Fe 3o 4be reoxidised into Fe 2o 3, newborn Fe 2o 3active high, make its crystallization more perfect, product strength improves.After the flux added in coarse particles or pulverized anthracite decomposes, reaction, will form uniform microvoid structure in agglomerate, thus product strength is good, and the ability absorbing expansion in reduction process is strong.
Secondly, owing to only with the addition of a small amount of flux or solid fuel in material of granulating, when comprehensive basicity and solid fuel total amount certain, in sinter mixture, solid-fuelled consumption is increased to 6% ~ 8% by 3% ~ 5% of ordinary sinter technique, compound basicity (CaO/SiO 2) be increased to 2.5 ~ 3.5.Raising solid fuel consumption can improve the amount of liquid phase in sintered material on the one hand, also granulates for low-carbon (LC) on the other hand and expects to provide enough outside heat.Meanwhile, the carbon monoxide that in solid fuel, carbon and oxidation thereof generate makes the oxidizing reaction part of ferriferous oxide in granulation material be restricted, and rhombohedral iron ore content obviously reduces, and forms uniform micro after solid fuel ignition, is conducive to absorption of stress.And the raising of compound basicity is conducive to the formation of high-quality Binder Phase calcium ferrite in sinter mixture, thus improves the intensity of product agglomerate; In addition, a large amount of Fe 2o 3participate in forming calcium ferrite, rhombohedral iron ore crystal grain content in agglomerate is reduced, and the power that reduction swellability occurs in reduction process reduces, thus inhibits the low temperature reduction degradation of agglomerate.
Again, the suction pressure of the process of baking with agglomeration is reduced to 8.0kPa ~ 9.0kPa by 10kPa by the present invention; Agglomerate cooling negative pressure has 5kPa to be reduced to 3kPa ~ 4kPa, and suitably reduces cooling machine speed, extends cooling time.Suitable reduction sintering suction pressure, on the basis ensureing productivity of sinter, sintering velocity can be made to reduce, liquid phase produces fully, improves favourable to sinter strength.Reduce agglomerate cooling suction pressure, extend cooling time, the speed of cooling of agglomerate can be made to reduce, and liquid phase crystallization degree is improved, and the glassiness and skeleton crystal rhombohedral iron ore content reduce, and significantly can suppress the low temperature reduction degradation of agglomerate.
After adopting method of the present invention, agglomerate is in low-temperature reduction process, and the reduction of rhombohedral iron ore and skeleton crystal rhombohedral iron ore content, the quantity producing initial crack because of crystal conversion is obviously reduced, and this fundamentally reduces the possibility that efflorescence occurs.And a large amount of generations of high-quality Binder Phase in agglomerate, the improvement of terms of Binder Phase crystallisation by cooling, the stronger absorption crushing stress that made it possess and resist the ability of efflorescence, thus low temperature powder performance be improved significantly.
Compared with prior art, advantage of the present invention is:
1) Fe in the agglomerate produced of method of the present invention 2o 3content reduces by 5% ~ 10%, RDI + 3.15improve 5% ~ 25%, significantly improve blast furnace permeability, be conducive to smooth operation of furnace.
2) adopt the present invention, sintered ore rotary drum strength improves 3% ~ 8%, and yield rate improves 5% ~ 12%, and utilization coefficient improves 0.2tm -2h -1~ 0.5tm -2h -2, solid fuel consumption reduces 5kg/t agglomerate~ 8kg/t agglomerate.
3) adopt the present invention, permeability of sintering material bed improves, and suction pressure and cooling negative pressure reduce, and power consumption significantly reduces.
Specific embodiment
The present invention will be further explained below, and described in embodiment, percentage composition is mass content, and described ratio is mass ratio.
Comparative example 1:
(1) by hematite concentrates (Fe in iron ore concentrate 2o 3mass content is 95%) 9kg, powdered iron ore 14kg become the sinter mixture of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 1.2kg, Wingdale 0.8kg and 7kg mixed pelletization of returning mine;
(2) sinter mixture cloth is sintered on sinter machine, wherein control sintering suction pressure is 10kPa, cooling negative pressure 5kPa, cooling time 5min.
Gained agglomerate yield rate is 69.92%, barrate strength is 63.45%, utilization coefficient is 1.14tm -2h -1, solid burnup is 50.23kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 74.88%.
Embodiment 1:
(1) by the hematite concentrates (Fe in iron ore concentrate in sintering iron-bearing material 2o 3mass content is 95%) add the granulation material that 0.5% pulverized anthracite is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content 60%;
(2) then iron ore concentrate 2.25kg, powdered iron ore 14kg are become the sinter mixture of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 1.2kg, Wingdale 0.8kg and 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 20:80, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate 76.58%, barrate strength are 64.18%, utilization coefficient is 1.42tm -2h -1, solid burnup is 46.74kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 83.12%.
Embodiment 2:
(1) by the hematite concentrates (Fe in iron ore concentrate in sintering iron-bearing material 2o 3mass content is 95%) add the granulation material that 1.0% pulverized anthracite is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content 60%;
(2) then powdered iron ore 14kg is become the sinter mixture of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 1.2kg, Wingdale 0.8kg and 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 27:73, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 10min.
Gained agglomerate yield rate 80.58%, barrate strength are 65.79%, utilization coefficient is 1.58tm -2h -1, solid burnup is 45.54kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 86.74%.
Embodiment 3:
(1) by the hematite concentrates (Fe in iron ore concentrate in sintering iron-bearing material 2o 3mass content is 95%) add the granulation material that 0.75% pulverized anthracite is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content 60%;
(2) then powdered iron ore 14kg is become the sinter mixture of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 1.2kg, Wingdale 0.8kg and 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 27:73, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 8kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate 82.33%, barrate strength are 66.12%, utilization coefficient is 1.61tm -2h -1, solid burnup is 45.23kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 87.53%.
Comparative example 2:
(1) by magnetite concentrate (Fe in iron ore concentrate 3o 4mass content is 90%, F content is 0.34%) with powdered iron ore altogether 23kg to become the sinter mixture (basicity 1.9) of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 1kg, Wingdale 1kg and 7kg mixed pelletization of returning mine;
(2) sinter mixture cloth, bake with agglomeration, wherein control sintering suction pressure is 10kPa, cooling negative pressure 5kPa, cooling time 5min.
Gained agglomerate yield rate is 80.96%, barrate strength is 55.63%, utilization coefficient is 1.51tm -2h -1, cryogenic reducting powder index RDI + 3.15be 65.38%.
Embodiment 4:
(1) by sintering iron-bearing material by magnetite concentrate (Fe in iron ore concentrate 3o 4mass content is 90%, F content is 0.34%) add the granulation material that 0.5% ground dolomite is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content is 65%.
(2) then the powdered iron ore 11.4kg except iron ore concentrate is become the sinter mixture (basicity 1.6) of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 0.6kg, Wingdale 0.6kg and 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 35:65, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate is 79.64%, barrate strength is 60.79%, utilization coefficient is 1.62tm -2h -1, cryogenic reducting powder index RDI + 3.15be 70.89%.
Embodiment 5:
(1) by sintering iron-bearing material by magnetite concentrate (Fe in iron ore concentrate 3o 4mass content is 90%, F content is 0.34%) add the granulation material that 1% ground dolomite is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content is 65%.
(2) then the powdered iron ore 10.5kg except iron ore concentrate is become the sinter mixture (basicity 1.6) of 0.5mm ~ 8mm with coke powder 1kg, unslaked lime 0.8kg, Wingdale 0.6kg and 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 40:60, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate is 79.61%, barrate strength is 64.77%, utilization coefficient is 1.61tm -2h -1, cryogenic reducting powder index RDI + 3.15be 77.0%.
Comparative example 3:
(1) by magnetite concentrate (Fe in iron ore concentrate 3o 4mass content is 77%, TiO 2content is 12.22%) altogether 23kg and coke powder 1kg, unslaked lime 2kg to become the sinter mixture of 0.5mm ~ 8mm with 7kg mixed pelletization of returning mine with powdered iron ore;
(2) sinter mixture cloth, bake with agglomeration, wherein control sintering suction pressure is 10kPa, cooling negative pressure 5kPa, cooling time 5min.
Gained agglomerate yield rate is 65.72%, barrate strength is 56.75%, utilization coefficient is 1.27tm -2h -1, solid burnup is 53.55kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 64.53%.
Embodiment 6:
(1) by sintering iron-bearing material by magnetite concentrate (Fe in iron ore concentrate 3o 4mass content is 77%, TiO 2content is 12.22%) add the granulation material that 1% limestone powder is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content is 65%.
(2) then the powdered iron ore 11.4kg except iron ore concentrate and coke powder 1kg, unslaked lime 1.6kg are become the sinter mixture of 0.5mm ~ 8mm with 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 35:65, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate is 71.32%, barrate strength is 61.55%, utilization coefficient is 1.45tm -2h -1, solid burnup is 48.31kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 82.69%.
Embodiment 7:
(1) by the magnetite concentrate (Fe in iron ore concentrate in sintering iron-bearing material 3o 4mass content is 77%, TiO 2content is 12.22%) add the granulation material that 1% limestone powder is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content 65%;
(2) then the powdered iron ore 11kg except iron ore concentrate and coke powder 1kg, unslaked lime 2kg are become the sinter mixture of 0.5mm ~ 8mm with 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 35:65, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate is 73.54%, barrate strength is 63.12%, utilization coefficient is 1.51tm -2h -1, solid burnup is 47.55kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 84.34%.
Embodiment 8:
(1) by the magnetite concentrate (Fe in iron ore concentrate in sintering iron-bearing material 3o 4mass content is 77%, TiO 2content is 12.22%) add the granulation material that 1% limestone powder is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content 65%;
(2) then the powdered iron ore 11kg except iron ore concentrate and coke powder 1kg, unslaked lime 2kg are become the sinter mixture of 0.5mm ~ 8mm with 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 35:65, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 9kPa, cools negative pressure 4kPa, cooling time 8min.
Gained agglomerate yield rate is 72.38%, barrate strength is 62.55%, utilization coefficient is 1.48tm -2h -1, solid burnup is 47.89kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 83.71%.
Embodiment 9:
(1) by the magnetite concentrate (Fe in iron ore concentrate in sintering iron-bearing material 3o 4mass content is 77%, TiO 2content is 12.22%) add the granulation material that 1% limestone powder is prepared into 3mm ~ 15mm, wherein 6mm ~ 10mm grain size content 65%;
(2) then the powdered iron ore 11kg except iron ore concentrate and coke powder 1kg, unslaked lime 2kg are become the sinter mixture of 0.5mm ~ 8mm with 7kg mixed pelletization of returning mine;
(3) granulate material and sinter mixture press the mass ratio mixing of 40:60, cloth, bake with agglomeration, wherein controlling to sinter suction pressure is 8kPa, cools negative pressure 3.5kPa, cooling time 10min.
Gained agglomerate yield rate is 73.91%, barrate strength is 63.82%, utilization coefficient is 1.53tm -2h -1, solid burnup is 46.54kg/t agglomerate, cryogenic reducting powder index RDI + 3.15be 85.01%.

Claims (6)

1. one kind is suppressed the method for iron ore sinter low temperature reduction degradation, it is characterized in that, add limestone powder or ground dolomite or pulverized anthracite in iron-bearing material in raw materials for sintering and be prepared into the granulation material that granularity is 3mm ~ 15mm, then granulation material is added in sinter mixture and mix, bake with agglomeration, wherein granulation material adds proportioning and is again: material of granulating: sinter mixture=(20 ~ 60): (40 ~ 80);
The granularity <0.2mm of described limestone powder or ground dolomite, addition are 0.1% ~ 1.0% of material total mass of granulating; The granularity <0.1mm of described pulverized anthracite, addition account for 0.2% ~ 1.0% of material total mass of granulating; Further, Fe in described iron-bearing material 3o 4mass content when being greater than 70%, pellet preparation process processed adds and accounts for material total mass 0.1% ~ 1.0% of granulating, the limestone powder of granularity <0.2mm or ground dolomite; As Fe in iron-bearing material 2o 3mass content when being greater than 70%, pellet preparation process processed add accounting for material total mass 0.2% ~ 1.0% of granulating, granularity is more than or equal to 0.045mm and is less than the pulverized anthracite of 0.1mm;
Described suction pressure of baking with agglomeration controls as 8kPa ~ 9kPa, and cooling vacuum cavitations is 3kPa ~ 4kPa, controls cooling time as 6min ~ 10min.
2. a kind of method suppressing iron ore sinter low temperature reduction degradation according to claim 1, it is characterized in that, described iron-bearing material is the iron ore concentrate of granularity <0.1mm.
3. a kind of method suppressing iron ore sinter low temperature reduction degradation according to claim 1, is characterized in that, Fe in described iron-bearing material 3o 4when mass content is 77%, limestone powder addition accounts for 1% of material total mass of granulating; Fe in described iron-bearing material 3o 4when mass content is 90%, ground dolomite addition accounts for 1% of material total mass of granulating; Fe in iron-bearing material 2o 3when mass content is 95%, pulverized anthracite addition accounts for 0.75% of material total mass of granulating.
4. according to a kind of described method suppressing iron ore sinter low temperature reduction degradation of one of claim 1-2, it is characterized in that, 6mm ~ 10mm grade mass content >60% in described granulation material granularity.
5. according to a kind of described method suppressing iron ore sinter low temperature reduction degradation of one of claim 1-2, it is characterized in that, described sinter mixture is made up of powdered iron ore, solid fuel, flux and returning mine, wherein powdered iron ore, solid fuel and flux are in mass ratio (75 ~ 85): (6 ~ 9): (10 ~ 16) coordinate, and consumption of returning mine is 30% ~ 50% of powdered iron ore, solid fuel and flux total mass.
6., according to a kind of described method suppressing iron ore sinter low temperature reduction degradation of one of claim 1-2, it is characterized in that, described in suction pressure of baking with agglomeration be 9kPa, cooling negative pressure is 4kPa, and cooling time is 8min.
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