CN102206744B - Method for granulating sinter mixture - Google Patents

Method for granulating sinter mixture Download PDF

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Publication number
CN102206744B
CN102206744B CN 201010140491 CN201010140491A CN102206744B CN 102206744 B CN102206744 B CN 102206744B CN 201010140491 CN201010140491 CN 201010140491 CN 201010140491 A CN201010140491 A CN 201010140491A CN 102206744 B CN102206744 B CN 102206744B
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compound
weight
ore powder
flux
rich ore
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CN102206744A (en
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甘勤
何群
何木光
文永才
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Pangang Group Steel Vanadium and Titanium Co Ltd
Pangang Group Research Institute Co Ltd
Pangang Group Panzhihua Steel and Vanadium Co Ltd
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Steel Vanadium and Titanium Co Ltd
Pangang Group Research Institute Co Ltd
Pangang Group Panzhihua Steel and Vanadium Co Ltd
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Abstract

The invention discloses a method for granulating a sinter mixture. The method is characterized in that: the method comprises the following steps: a first mixture is mixed with rich ore powder and a flux to obtain a second mixture, and the second mixture is granulated; the first mixture comprises the flux, fuel, and water, and also comprises/does not comprise the rich ore powder; the rich ore powder in the first mixture accounts for 0 to 50 wt% of the rich ore powder in the second mixture; the flux in the first mixture accounts for 40 to 80 wt% of the flux in the second mixture; and the second mixture comprises 1000 to 1800 parts by weight of the rich core powder, 40 to 75 parts by weight of the fuel and 40 to 100 parts by weight of water relative to 100 parts by weight of the flux.

Description

A kind of method of granulating sinter mixture
Technical field
The present invention relates to a kind of method of granulating sinter mixture.
Background technology
At home and abroad exist in the iron ore concentrate sintered production and how further improve the mixture granulation performance, thus the problem of raising bed permeability and agglomerate quality.Up to now, following several sintering technologies have been researched and developed both at home and abroad, for example, document CN85100645A discloses a kind of for iron ore concentrate sintered technique, i.e. two basicity TYPE MINI-PELLET SINTERING TECHNIQUE, it is characterized in that iron ore concentrate is divided into two portions, requirement by blast furnace slag making basicity and Performance of Slag, the fine mill flux (Wingdale, wagnerite) of desired number is allocated into respectively in two portions iron ore concentrate, make particle diameter less than the bead of two kinds of different basicity of 5 millimeters, and then add suitable fuel, and after evenly mixing, sintering on the sinter machine of packing into.NKK develops a kind of HPS sintering technology, and its step comprises: the first step pelletizing is mixed into mixture with fine iron ore and fusing assistant, and this mixture pelletizing is become raw pellet ore; The second step pelletizing, in raw pellet ore, add coke powder, make the raw pellet ore that scribbles coke powder by pelletizing, perhaps can further raw pellet ore be sieved and by size grading, add coke powder in each group ore particle and the addition by quantitatively making coke powder strengthens along with the increase of each ore particle group particle diameter, then with each group raw pellet ore coating; The raw pellet ore that will scribble at last coke powder is put into fire grate sinter machine sintering, sees document CN87108122A.Document CN1924035A discloses a kind of iron ore concentrate composite agglomeration technology, the granule iron concentrate that it is characterized in that accounting for all iron-bearing material per-cents and be the 30-60 % by weight adds binding agent and fuel is prepared burden, mixing, and compound is made the pelletizing that diameter is 8-16mm in balling disc; Prepare burden accounting for meal ore deposit that all iron-bearing material per-cents are the 70-40 % by weight and other iron-bearing materials and flux and fuel; Then with pelletizing and secondary mixed material mixing, on sinter machine, carry out cloth, igniting, sintering, whole grain after cooling is made the complex sintered lump ore that is comprised of acidic pellet ore embedding high basicity sinter.
Above three kinds of technology are being improved the granulating sinter mixture performance, are being improved and to have obtained certain effect aspect the Sintering Operation Index, but these technology are only applicable to the less common iron ore concentrate of granularity or the pelletization of ground hematite.
(particle diameter only is about 50 % by weight less than the grain size content of 0.074mm for having coarse size, and the particle diameter of common iron ore concentrate is general all more than 70 % by weight less than the 0.074mm grain size content), size composition unreasonable (grain size content is many in the middle of the 0.074-0.25mm that is unfavorable for granulating), the vanadium iron magnetite concentrate of the characteristics such as wetting ability is poor (Flos Bombacis Malabarici v-ti magnetite concentrate for example, it is that ferric charge is up to the rich ore powder more than 60 % by weight), because this iron ore concentrate coarse size, wetting ability is poor, cause the granulating sinter mixture difficulty, permeability of sintering material bed is poor, and the effect of therefore using above-mentioned three kinds of technology to obtain is comparatively limited.
Summary of the invention
To the objective of the invention is to have the shortcomings such as granulating sinter mixture difficulty and permeability of sintering material bed be poor when using the poor rich ore powder of coarse size, wetting ability in the prior art in order overcoming, to provide that a kind of permeability of sintering material bed is good, technique simple and be applicable to the method for the granulating sinter mixture of suitability for industrialized production.
The method of granulating sinter mixture provided by the invention, it is characterized in that, the method comprises mixes the first compound with rich ore powder and flux, obtain the second compound, then with this second compound granulation, contain flux and fuel and water in described the first compound, and contain or do not contain rich ore powder, the amount of rich ore powder is the 0-50 % by weight of the amount of rich ore powder in described the second compound in described the first compound, the amount of flux is the 40-80 % by weight of the amount of flux in described the second compound in described the first compound, in described the second compound, with respect to the flux of 100 weight parts, rich ore powder, the content of fuel and water is respectively the 1000-1800 weight part, the 40-75 weight part, the 40-100 weight part.
The method of granulating sinter mixture provided by the invention has the following advantages:
(1) adopts method of the present invention, improve the ability that rich ore powder adheres to fine granules, reduced in the compound<content of 1mm powder, improved size composition and the pellet performance of sinter mixture, improve ventilation property and the sintering velocity of sinter bed, thereby improved the output of agglomerate.
(2) adopt method of the present invention, strengthened the iron ore concentrate granulation, improved the intensity of granulation bead, be conducive to the raising of sintered ore rotary drum strength.
(3) adopt method of the present invention, can form local high alkalinity on granulation bead surface, promote the generation of the high-quality Binder Phases such as calcium ferrite, be conducive to improve mineral composition and the structure of agglomerate, improve sintered ore rotary drum strength and yield rate.
(4) adopt method of the present invention, can improve the metallurgical performance of agglomerate, be conducive to improve the technico-economical comparison of blast-furnace smelting.
Embodiment
The present inventor finds, thick when the granularity of rich ore powder in the sinter mixture, when wetting ability is relatively poor, granulate by the mode that adds in batches rich ore powder and flux, the rich ore powder of participation mixed once and the content of flux have considerable influence to the stability of granulation bead; In addition, the present inventor also finds, if will contain the raw materials such as the compound of rich ore powder and flux through granulating first after the mixed once with the compound that contains rich ore powder and flux through the secondary mixing granulation, the ventilation property of resulting sinter bed is still undesirable again.
Therefore, among the present invention, described the first compound is the direct mixture by being mixed to get without granulation.Concrete, the method of granulating sinter mixture provided by the invention comprises mixes the first compound with rich ore powder and flux, obtain the second compound, then with this second compound granulation, contain flux and fuel and water in described the first compound, and contain or do not contain rich ore powder, the amount of rich ore powder is the 0-50 % by weight of the amount of rich ore powder in described the second compound in described the first compound, the amount of flux is the 40-80 % by weight of the amount of flux in described the second compound in described the first compound, in described the second compound, with respect to the flux of 100 weight parts, rich ore powder, the content of fuel and water is respectively the 1000-1800 weight part, the 40-75 weight part, the 40-100 weight part.
By regulating rich ore powder and the consumption of flux and the mode that rich ore powder and flux are added in employing in batches that participates in mixed once, alleviated the destruction of secondary mixing to the granulation bead, strengthened the stability of granulation bead, improve the ability that rich ore powder adheres to fine granules, reduced in the sinter mixture diameter less than the content of the powder of 0.5mm; Simultaneously, greatly improve ventilation property and the sintering velocity of sinter bed by the mode of once granulating, shortened sintering time.
Although with rich ore powder and flux in above-mentioned amount ranges in batches with addition of realizing purpose of the present invention, further under the preferable case, the amount of rich ore powder is the 0-30 % by weight of the amount of rich ore powder in described the second compound in described the first compound, and the amount of flux is the 40-60 % by weight of the amount of flux in described the second compound in described the first compound.
In the method for granulating sinter mixture provided by the invention, it is the above iron ore raw materials of above preferred 60 % by weight of 50 % by weight that described rich ore powder refers generally to iron level, can be the high TiO of thick (particle diameter is lower than 70 % by weight less than the 0.074mm grain size content) of particle 2The type v-ti magnetite concentrate also can be common iron ore concentrate or the ground hematite of thin (particle diameter is more than 70 % by weight less than the 0.074mm grain size content) of particle.In order to embody better advantage of the present invention, the preferred described rich ore powder of the present invention is that iron-holder is that 50 % by weight are above, particle diameter is iron ore raw material more than 40 % by weight less than the grain size content of 0.074mm.
The present inventor is surprised to find that, the rich ore powder that is the original thicker particle diameter of part or all of granularity that participates in mixed once 3-8mm changes adding when secondary mixes into, simultaneously flux by a certain percentage when mixed once and the secondary mixing respectively with addition of, then mixing granulation in second drum mixer, the output of the ventilation property of gained sinter bed, sintering velocity, agglomerate can be significantly improved.Reason is, rich ore powder plays the granulation core in sinter mixture, but the bead that the thicker rich ore powder of granularity is made in primary mixer easily is damaged when secondary mixes, and therefore adopts the thinner rich ore powder of most of granularity to participate in mixed once; Simultaneously, because the particulate raw material is more in mixed once material of the present invention, therefore also allocate more flux into, be unslaked lime, utilize the cohesive action of unslaked lime, reach and strengthen the purpose of granulating, so more be conducive to improve the balling-up of mixed once material, the bead stability that therefore obtains granulating is fine.
Therefore, in the present invention, even the granularity of rich ore powder to be dealt with is thicker, before mixed once, do not need its do pulverizing is waited special processing yet, only do in case of necessity rough segmentation, namely when secondary mixes, add the thicker rich ore powder of granularity, also can reach purpose of the present invention.
Because method provided by the invention can process the thicker breeze of granularity, therefore when preparing the first compound, can allocate the thicker iron-bearing auxiliary material of other particle diameters into and/or return mine.The iron-bearing auxiliary material that iron-bearing auxiliary material refers generally to produce in the Iron and Steel Production is such as gas ash, slag etc.; Return mine refer generally to after blast furnace screening, to return sintering<agglomerate of 5mm.Usually, iron-bearing auxiliary material, the granularity of returning mine for greater than 0 to less than or equal to 5mm.In the first compound of the present invention, with these iron-bearing auxiliary materials, returning mine is mixed together with flux, recycle, thereby reach the purpose that effectively utilizes secondary resource.In the first compound of the present invention, with respect to the flux of 100 weight parts, iron-bearing auxiliary material, total consumption of returning mine are the 250-350 weight part.
In the method for granulating sinter mixture provided by the invention, described flux is used for strengthening rich ore powder to the viscosifying power of fine granules, improves the pellet performance of compound.Preferable particle size of the present invention be greater than 0 to less than or equal to the thinner unslaked lime of 300 microns granularity as flux, reason is, the unslaked lime granularity is very thin, wetting ability is strong, toughness, stick to that the burning to fuel has katalysis on the particle surface, the particle top layer combustionvelocity of can accelerating to granulate improves sintering velocity; The trickle quicklime particles of granularity is easily produced low melting component in addition, and Liquid phase flowability is good, condenses fast, can reduce firing rate and zone of combustion resistance.In the present invention, CaO content is preferably more than 50 % by weight in the described unslaked lime.CaO content is higher in the unslaked lime, and is stronger to the catalytic capability of fuel.Therefore further under the preferable case, described in the present invention in the unslaked lime CaO content be more than 90 % by weight, i.e. active ash.More preferably, the unslaked lime that adds when the present invention granulates is allocated use into first again after adding water digestion, and described unslaked lime is before use with unslaked lime: preferred 1: 0.5 weight ratio of the weight ratio of water=1: 0.4-0.6 adds water digestion.
Contained fuel is preferably coke powder or pulverized anthracite in the first compound of the present invention, and with respect to the flux of 100 weight parts, the content of fuel is the 40-75 weight part, and the carbon content in the described fuel is the 65-84 % by weight.Because method provided by the invention improves the ventilation property of sinter bed greatly, improve sintering velocity, shorten sintering time, therefore can obviously reduce firing rate, energy-conservation material-saving.
According to the method for granulating sinter mixture provided by the invention, under the preferable case, the method comprises that also granulation gained pelletizing is put into the sinter machine mid point burns knot, and be 2.0min ignition time, and the igniting negative pressure is 600mmH 2O, the sintering negative pressure is 1200mmH 2O, sintered layer height are 650mm.
Further specify the present invention below in conjunction with embodiment.
Embodiment 1
This embodiment is used for illustrating the method for granulating sinter mixture provided by the invention.
Mixed once: 4 kilograms unslaked limes (CaO content is 84 % by weight) are added behind 2 kilograms the water digestion 5min and 2 kilograms iron-bearing auxiliary material (gas ash, particle diameter is less than 5mm, iron level is 36 % by weight), the 15 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 % by weight), 40 kilograms rich ore powder (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 % by weight, particle diameter is less than 0.074mm) and coke powder (carbon content is 82 % by weight) mechanical stirring in primary mixer of 2.9 kilograms, mix, obtain the first compound;
Secondary mixes: with 40 kilograms rich ore powders (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 % by weight, particle diameter is 0.074-1.5mm) and 1.0 kilograms postdigestive unslaked lime (CaO content is 84 % by weight, wherein use the water digestion 5min that adds 0.5 kilogram in the forward direction unslaked lime) join in above-mentioned the first compound, even through the mechanical stirring compound, obtain the second compound, then drum pelletizer (φ 0.8 * 1.5m packs this second compound into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is granulation time 4min, rotating speed is 60r/min, obtains sinter mixture.Wherein the amount ratio of unslaked lime is as shown in table 1 before the rich ore powder of twice use and the digestion.
Embodiment 2
This embodiment is used for illustrating the method for granulating sinter mixture provided by the invention.
Mixed once: 3 kilograms unslaked limes (CaO content is 84 % by weight) are added behind 1.5 kilograms the water digestion 5min and 2 kilograms iron-bearing auxiliary material (slag, particle diameter is less than 5mm, iron level is 36 % by weight), the 14 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 % by weight), 20 kilograms rich ore powder (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 % by weight, particle diameter is less than 0.074mm) and pulverized anthracite (carbon content is 80 % by weight) mechanical stirring in primary mixer of 2.9 kilograms, mix, obtain the first compound;
Secondary mixes: with 60 kilograms rich ore powders (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 % by weight, granularity is less than 1.5mm, be 33 % by weight less than the 0.074mm grain size content wherein, particle diameter is that the 0.074-1.5mm grain size content is 67 % by weight) and 2 kilograms unslaked lime (CaO content is 84 % by weight, wherein use the water digestion 5min that adds 1 kilogram in the forward direction unslaked lime) join in above-mentioned the first compound, even through the mechanical stirring compound, obtain the second compound, then drum pelletizer (φ 0.8 * 1.5m packs this second compound into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is granulation time 4min, rotating speed is 60r/min, obtains sinter mixture.Wherein the amount ratio of unslaked lime is as shown in table 1 before the rich ore powder of twice use and the digestion.
Embodiment 3
This embodiment is used for illustrating the method for granulating sinter mixture provided by the invention.
Method according to embodiment 2 is granulated, different is, when mixed once and secondary mix, the amount ratio of the rich ore powder that provides by table 1 is prepared respectively the first compound and the second compound, and the weight of rich ore powder is 4 kilograms (particle diameter is less than 0.074mm) in the first compound, in the second compound the weight of rich ore powder be 76 kilograms (particle diameter for greater than 0 to less than or equal to 1.5mm, be 47 % by weight less than the 0.074mm grain size content wherein, particle diameter is that the 0.074-1.5mm grain size content is 53 % by weight).
Embodiment 4
This embodiment is used for illustrating the method for granulating sinter mixture provided by the invention.
Mixed once: 2 kilograms unslaked limes (CaO content is 84 % by weight) are added after 1 kilogram the water digestion and 2 kilograms iron-bearing auxiliary material (gas ash, particle diameter is less than 5mm, iron level is 36 % by weight), the 13 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 % by weight) and coke powder (carbon content is 82 % by weight) mechanical stirring in primary mixer of 2.9 kilograms, mix, obtain the first compound;
Secondary mixes: again with 80 kilograms rich ore powder (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 % by weight, granularity is less than 1.5mm, be 47 % by weight less than the 0.074mm grain size content wherein, particle diameter is that the 0.074-1.5mm grain size content is 53 % by weight) and 3 kilograms unslaked lime (CaO content is 84 % by weight, wherein use the water digestion 5min that adds 1.5 kilograms in the forward direction unslaked lime) join in above-mentioned the first compound, even through the mechanical stirring compound, obtain the second compound, then drum pelletizer (φ 0.8 * 1.5m packs this second compound into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is to be 4min the granulation time, rotating speed is 60r/min, obtains sinter mixture.Wherein the amount ratio of unslaked lime is as shown in table 1 before the rich ore powder of twice use and the digestion.
Embodiment 5
This embodiment is used for illustrating the method for granulating sinter mixture provided by the invention.
Method according to embodiment 2 is granulated, different is, when mixed once and secondary mixed, the usage ratio of the rich ore powder that only provides by table 1 was prepared respectively the first compound and the second compound, and do not distinguish the particle diameter of rich ore powder, the amount ratio of unslaked lime was constant when mixed once and secondary mixed.
Embodiment 6
This embodiment is used for illustrating the method for granulating sinter mixture provided by the invention.
Method according to embodiment 5 is granulated, and different is that selected rich ore powder is common granule iron concentrate (iron level is 54 % by weight, and particle diameter is 100 % by weight less than the 0.074mm grain size content).
Table 1
Comparative Examples 1
According to the amount ratio shown in the table 1, with the iron-bearing auxiliary material (gas ash of the unslaked lime of 80 kilograms rich ore powders and 5 kilograms (using after adding 2.5 kilograms water digestion 5min) with 2 kilograms, particle diameter is less than 5mm, iron level is 36 % by weight), the 15 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 % by weight) and 2.9 kilograms coke powder (carbon content is 82 % by weight) in mixing machine, mix, even through the mechanical stirring compound, make compound even, then drum pelletizer (φ 0.8 * 1.5m packs into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is granulation time 4min, rotating speed is 60r/min, obtains sinter mixture.
Comparative Examples 2
Method according to embodiment 1 is granulated, different is, the rich ore powder consumption that participates in mixed once is 75 % by weight of its gross weight, and the rich ore powder consumption that participates in the secondary mixing is 25 % by weight of its gross weight, and the amount ratio of unslaked lime was constant when mixed once and secondary mixed.
Comparative Examples 3
Method according to embodiment 1 is granulated, different is, the unslaked lime consumption that participates in mixed once is 20 % by weight of its gross weight, and the unslaked lime consumption that participates in the secondary mixing is 80 % by weight of its gross weight, and the amount ratio of rich ore powder was constant when mixed once and secondary mixed.
Performance test
Embodiment 1-6 and the Comparative Examples 1-3 pelletizing that obtains of granulating is distributed into sintering in the sinter machine, and be 2.0min ignition time, and the igniting negative pressure is 600mmH 2O, the sintering negative pressure is 1200mmH 2O, sintered layer height are 650mm.Testing laboratory adopt the method for sieve screening record compound>3mm grain size content and<the 0.5mm content of powder; Calculate sintering velocity according to bed depth and sintering time; Pour out after agglomerate is burned, carry out naturally cooling, fall 2 times from the 2m eminence, sieve, get>the percentage ratio meter yield rate of 10mm grain size content; Get the 10-40mm grain size content and adopt the 1/2ISO drum unit to measure sintered ore rotary drum strength, sieve with the 6.3mm standard sieve at last, get>percentage ratio of 6.3mm grain size content represents sintered ore rotary drum strength; The arithmetical av of getting the weight percent of each grain size content of agglomerate is median size.The mensuration of low-temperature reduction disintegration energy is undertaken by GB13242-91, and reducing gas consists of CO30 volume %+N 270 volume % get less than the weight percentage of 3.15mm grade and make cryogenic reducting powder index (RDI); Middle temperature reducing property is measured and is undertaken by GB13244-91, and reducing gas consists of CO30 volume %+N 270 volume %, the reduction degree index when getting 180min are reduction degree index (RI).
The method of calculation of above-mentioned leading indicator are as follows:
(1) sintering velocity V (mm/min)
V=h/t ①
(2) yield rate y (%)
y=M 1/M ②
(3) utilization coefficient P (t/m2h)
P=(M 1/1000)·(1/A)·(60/t) ③
(4) tumbler index TI (%)
TI=M 2/M 3
Formula 1.-4. in:
The h-bed depth, mm;
The t-sintering time, min;
M 1->10mm finished product agglomerate weight, kg;
M-agglomerate gross weight, kg;
M 2Behind-the rotary drum>and 6.3mm grade weight, kg;
M 3-enter sample weight before the rotary drum, kg;
A-sinter machine area, M 2
The performance perameter of the agglomerate that embodiment 1-5 and Comparative Examples 1-3 make is shown in table 2 and table 3.
Table 2
>3mm grain size content, % <0.5mm content of powder, % Median size mm Sintering velocity mm/min Barrate strength>6.3mm, %
Embodiment 1 64.70 6.50 4.65 23.51 74.50
Embodiment 2 63.94 6.97 4.42 23.01 74.14
Embodiment 3 64.20 6.83 4.56 23.25 74.32
Embodiment 4 63.41 7.55 4.18 22.76 73.89
Embodiment 5 63.20 7.83 4.06 22.65 73.82
Embodiment 6 63.37 7.76 4.10 22.70 73.79
Comparative Examples 1 61.03 9.60 3.84 22.14 73.68
Comparative Examples 2 61.25 9.83 3.80 22.05 73.53
Comparative Examples 3 61.38 9.56 3.72 22.10 73.62
Table 3
Yield rate, % Utilization coefficient, t/m 2·h Cryogenic reducting powder index, % The reduction degree index, %
Embodiment 1 74.46 1.380 62.01 82.75
Embodiment 2 73.88 1.362 62.51 81.87
Embodiment 3 73.94 1.367 62.28 82.22
Embodiment 4 73.07 1.351 63.14 81.31
Embodiment 5 72.94 1.347 63.48 81.22
Embodiment 6 73.00 1.349 63.52 81.26
Comparative Examples 1 71.71 1.336 64.37 80.97
Comparative Examples 2 71.64 1.330 64.50 80.64
Comparative Examples 3 71.58 1.331 64.43 80.75
Can find out from the result of table 2 and table 3, do not adopt original production process of the present invention to compare with Comparative Examples 1, embodiment 1 gained sinter mixture>3mm grain size content increases by 3.67 percentage points,<0.5mm powder descends 3.10 percentage points, median size increases 0.81mm, sintering velocity improves 1.37mm/min, sintered ore rotary drum strength improves 0.82 percentage point, yield rate improves 2.75 percentage points, utilization coefficient increases by 3.19%, the agglomerate cryogenic reducting powder index descends 2.36 percentage points, and the reduction degree index improves 1.78 percentage points; Embodiment 2 gained sinter mixture>3mm grain size content increases by 2.91 percentage points,<0.5mm powder descends 2.63 percentage points, median size increases 0.58mm, sintering velocity improves 0.87mm/min, sintered ore rotary drum strength improves 0.46 percentage point, and yield rate improves 2.17 percentage points, and utilization coefficient increases by 1.91%, the agglomerate cryogenic reducting powder index descends 1.86 percentage points, and the reduction degree index improves 0.9 percentage point; Embodiment 3 gained sinter mixture>3mm grain size content increases by 3.17 percentage points,<0.5mm powder descends 2.77 percentage points, median size increases 0.72mm, sintering velocity improves 1.11mm/min, sintered ore rotary drum strength improves 0.64 percentage point, and yield rate improves 2.23 percentage points, and utilization coefficient increases by 2.27%, the agglomerate cryogenic reducting powder index descends 2.09 percentage points, and the reduction degree index improves 1.25 percentage points; Embodiment 4 gained sinter mixture>3mm grain size content increases by 2.38 percentage points,<0.5mm powder descends 2.05 percentage points, median size increases 0.34mm, sintering velocity improves 0.62mm/min, sintered ore rotary drum strength improves 0.21 percentage point, and yield rate improves 1.36 percentage points, and utilization coefficient increases by 1.11%, the agglomerate cryogenic reducting powder index descends 1.23 percentage points, and the reduction degree index improves 0.34 percentage point; Embodiment 5 gained sinter mixture>3mm grain size content increases by 2.17 percentage points,<0.5mm powder descends 1.77 percentage points, median size increases 0.22mm, sintering velocity improves 0.51mm/min, sintered ore rotary drum strength improves 0.14 percentage point, and yield rate improves 1.23 percentage points, and utilization coefficient increases by 0.82%, the agglomerate cryogenic reducting powder index descends 0.89 percentage point, and the reduction degree index improves 0.25 percentage point; Embodiment 6 gained sinter mixture>3mm grain size content increases by 2.34 percentage points,<0.5mm powder descends 1.84 percentage points, median size increases 0.26mm, sintering velocity improves 0.56mm/min, sintered ore rotary drum strength improves 0.11 percentage point, and yield rate improves 1.29 percentage points, and utilization coefficient increases by 0.96%, the agglomerate cryogenic reducting powder index descends 0.85 percentage point, and the reduction degree index improves 0.29 percentage point.
As seen from the above analysis, adopt the method for granulating sinter mixture provided by the invention, the main performance perameter of gained agglomerate all is significantly improved, and especially sintering velocity reaches as high as 23.51mm/min (as described in Example 1).This shows employing method of the present invention, and the ventilation property of sinter bed improves greatly, and sintering time further shortens.
It can also be seen that from the result of table 2 and table 3, among the embodiment 1-3 part or all of granularity is added when the rich ore powder of thick (particle diameter is 0.074-1.5mm) is placed on the secondary mixing, the ventilation property of the sintering velocity of gained agglomerate, yield rate and sinter bed obviously is better than the effect of embodiment 4.The result of embodiment 5 shows, adopts method of the present invention also to be applicable to common granule iron concentrate granulating sinter mixture, and the ventilation property of the yield rate of gained agglomerate and sinter bed all is better than adopting the agglomerate of existing technique preparation.

Claims (9)

1. the method for a granulating sinter mixture, it is characterized in that, the method comprises mixes the first compound with rich ore powder and flux, obtain the second compound, then with this second compound granulation, contain flux in described the first compound, fuel and water, and contain or do not contain rich ore powder, the amount of rich ore powder is the 0-30 % by weight of the amount of rich ore powder in described the second compound in described the first compound, the amount of flux is the 40-60 % by weight of the amount of flux in described the second compound in described the first compound, in described the second compound, with respect to the flux of 100 weight parts, rich ore powder, the content of fuel and water is respectively the 1000-1800 weight part, the 40-75 weight part, the 40-100 weight part.
2. method according to claim 1, wherein, the amount of rich ore powder is 0 % by weight of the amount of rich ore powder in described the second compound in described the first compound, described the first compound makes by flux is mixed with fuel and water, with respect to the flux of 100 weight parts, the consumption of fuel and water is respectively 40-70 weight part, 40-70 weight part.
3. method according to claim 1, wherein, described rich ore powder is that iron-holder is that 50 % by weight are above, particle diameter is iron ore raw material more than 40 % by weight less than the grain size content of 0.074mm.
4. method according to claim 3, wherein, in described the first compound the amount of rich ore powder be rich ore powder in described the second compound amount greater than 0 % by weight to less than or equal to 30 % by weight, described the first compound passes through rich ore powder, flux, fuel and water mixing make, flux with respect to 100 weight parts, the consumption of described rich ore powder is to less than or equal to 900 weight parts greater than 0, the consumption of fuel and water is respectively the 40-70 weight part, the 40-55 weight part, in described the first compound, particle diameter is the 40-90 % by weight of rich ore powder total amount in described the first compound less than the content of the rich ore powder of 0.074mm.
5. according to claim 1 or 4 described methods, wherein, described rich ore powder is one or more in v-ti magnetite concentrate, common iron ore concentrate or the ground hematite.
6. method according to claim 1 wherein, also contains iron-bearing auxiliary material and/or returns mine in the first compound, with respect to the flux of 100 weight parts in the first compound, described iron-bearing auxiliary material and the total amount of returning mine are the 250-350 weight part.
7. method according to claim 1, wherein, described flux is unslaked lime and/or Wingdale.
8. method according to claim 1, wherein, described fuel is coke powder or pulverized anthracite, and the carbon content in the described fuel is the 65-84 % by weight.
9. method according to claim 1, wherein, the method also comprises carries out sintering with the granulation products therefrom.
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