CN104164556B - A kind of difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process - Google Patents
A kind of difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process Download PDFInfo
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Abstract
The invention provides a kind of difficulty and select iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, mainly comprise the technical steps that: (1) iron ore grading: from 0～15mm grade iron ore, sub-elect 5～15mm, 3～5mm, tetra-grade iron ores of 1～3mm and 0～1mm；(2) drying grate heated oxide: granularity is that 5～15mm iron ore is dried in drying grate, preheats and aoxidizes；(3) rotary kiln baking is once magnetized: the ferric oxide ore discharged from drying grate and 3～5mm grade iron ore and 1～3mm grade iron ore carry out magnetizing roast in rev kiln；(4) secondary magnetization rotary kiln baking: the premagnetization iron ore once discharged in magnetization rotary kiln and grade iron ore magnetize the waste heat relying on self in rotary kiln and carry out reduction reaction with reduction carbon at secondary；(5) ore grinding of roasted ore and magnetic separation.
Description
Technical field
The invention belongs to metallurgical and mineral engineering technology field, relate to a kind of difficulty and select iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process.
Background technology
At present, along with the constantly exploitation of domestic high grade iron Ore, exhaustion occurs, and the rising steadily of iron ore price so that iron ore of low ore grade and compound symbiotic iron ore are provided with bigger extraction value, and become the important directions in the future utilized.
In the recovery process of iron ore of low ore grade, generally can produce 40～50% granularities is below 15mm powdered iron Ore.At present, the Application way of powder low grade iron ore mainly has magnetic separation, magnetizing roast and direct-reduction etc..For needing the grade carrying out magnetizing roast to be 25～35% refractory iron ores, granularity be after the domestic commonly used shaft furnace of iron ore of more than 15mm carries out magnetizing roast then through magnetic selection method to produce Iron concentrate, and for the granularity iron ore less than 15mm, it is common to adopt ore grinding-high intensity magnetic separation process, rotary kiln magnetizing roast-mill to select technique to utilize.
Domestic when adopting high intensity magnetic separation process to dispose for 0～15mm refractory iron ore, owing to iron ore magnetic is less and crystal grain is fine, the iron concentrate grade obtained is 46～48%, iron recovery is about 67%, causes the bigger wasting of resources.When 0～15mm refractory iron ore adopts rotary kiln to carry out wholegrain level magnetizing roast, owing to iron ore granularity difference is relatively big, easily cause the ring formation phenomenon of bulky grain underburnt in iron ore magnetizing roast, the quality non-uniform phenomenon of little granule burning and rotary kiln kiln body.When 0～15mm refractory iron ore adopts direct reduction process to utilize, owing to the Iron grade of Ore is relatively low and silicone content is higher, the metallization iron powder productivity that direct-reduction obtains is relatively low, metal recovery rate is relatively low and impurity content is higher, is difficult to the needs meeting steel-making or electric furnace production.
In addition, domestic when adopting rotary kiln to carry out wholegrain level magnetizing roast in 0～15mm powdered iron Ore, ring formation problem produced by 0～1mm fine particle iron ore, rotary kiln is entered for restriction fine particle iron ore, 0～1mm fine is sorted out from iron ore, and adopt ore grinding, coal blending pelletizing, rotary kiln magnetizing roast, 0～1mm fine is utilized by the methods such as mill choosing, due to particulate iron ore produce carbonaceous pelletizing in rotary kiln in magnetizing roast process intensity relatively low, it is difficult to meet the requirement of pellet magnetizing roast, still easily cause the ring formation phenomenon of rotary kiln simultaneously.For improving the intensity of pellet, the Iron grade of pellet then can be reduced when adopting more inorganic binder (such as bentonite), but when adopting organic binder bond, although there being higher intensity at low temperatures, but when temperature reaches about 700 DEG C, binding agent can lose adhesion strength and produce powder phenomenon-tion.
In the grading of iron ore, the domestic complexity being typically based on the screening of different grain size scope iron ore is determined the grading range of granularity, it is issued to uniform roasting quality to determine rational particle size range at certain roasting time, sintering temperature, thus there is also, for each particle size range iron ore, the phenomenon that roasting quality is uneven when magnetizing roast after causing iron ore grading not according to iron ore.
Summary of the invention
The present invention is directed to domestic when processing 0～15mm difficulty and selecting iron ore of low ore grade at present, adopt the problem that granularity difference is relatively big, roasting quality is uneven, ring formation easily occurs in kiln body and metal recovery rate is relatively low that rotary kiln carries out existing in magnetizing roast process, it is provided that a kind of difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process.
For this, the present invention adopts the following technical scheme that
A kind of difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, comprises the technical steps that:
(1) iron ore grading: adopt broken method to make its granularity reach below 15mm iron ore, to 0～15mm grade iron ore initially with the method sieved, 0～5mm, two grade iron ores of 5～15mm are sub-elected from 0～15mm grade iron ore, then the method adopting selecting crude drugs with winnower, from the iron ore that granularity is 0～5mm, sorting is 0～1mm, tri-grade iron ores of 1～3mm and 3～5mm；By weight, the materials ratio of each size fraction ranges iron ore is: it is 25～35 parts that 5～15mm grade controls, to control be 10～15 parts to 3～5mm grade, to control be 10～15 parts to 1～3mm grade, 0～1mm grade controls to be 25～35 parts；
(2) drying grate heated oxide: granularity is that 5～15mm iron ore adds from the entrance of drying grate, iron ore is in drying grate heating process, the discharge temperature controlling material is 900～950 DEG C, heat time heating time is 15～25min, makes iron ore be dried, preheats and aoxidize；
(3) rotary kiln baking is once magnetized: after 900～950 DEG C of ferric oxide ores and the 3～5mm grade iron ore discharged from drying grate and 0～3mm sized coal of 2～5 parts mix, mixed material adds from the kiln tail once magnetizing rotary kiln, once magnetization rotary kiln end is provided with the outer heater for fuel, mixed material constantly overturns and from kiln Caudad kiln hood moving process in rotary kiln, it is heated gradually heating up and magnetizing roast, when iron ore moves to rotary kiln central region, from once magnetizing the coal dust that rotary kiln end sprays into 0～1mm grade of 1～3mm grade iron ore and 2～5 parts, magnetizing roast is proceeded after the coal powder second mixing of mixed material and 1～3mm grade iron ore and 0～1mm grade, controlling iron ore is 850～900 DEG C in the heating-up temperature once magnetized in rotary kiln, heat time heating time is 10～20min, iron ore can be made to reach 70～80% from the susceptibility once magnetizing rotary kiln discharge；
(4) secondary magnetization rotary kiln baking: magnetize rotary kiln from secondary after mixing for three times from the 0～1mm grade coal dust once magnetizing 850～900 DEG C of premagnetization iron ores discharged in rotary kiln and 0～1mm grade iron ore, 2～5 parts and add, secondary magnetization rotary kiln is not provided with heater, magnetizing mixed material in rotary kiln at secondary relies on the waste heat of self to carry out reduction reaction with reduction carbon, the recovery time controlling material is 20～30min, then magnetizes rotary kiln from secondary and discharges；
(5) ore grinding of roasted ore and magnetic separation: making its granularity reach-200 orders after the iron ore grinding after magnetizing roast and account for more than 80%, then adopt magnetic separation process to carry out ore dressing, obtaining grade is 56～60%, and metal recovery rate is the Iron concentrate of 82～88%.
Further, also comprise the steps: between step (4) and step (5)
Continuity reduction and waste heat recovery: enter into waste-heat recovery device after the material of magnetizing roast magnetizes rotary kiln discharge from secondary, make material utilize self waste heat carry out continuity reduction in waste-heat recovery device and material waste heat is reclaimed.
Further, described waste-heat recovery device includes tank body, described tank body is provided with material inlet, material outlet, the epicoele of described tank body is continuity reducing zone, cavity of resorption is heat transfer zone, being provided with heat exchanger tube in described heat transfer zone, described heat exchanger tube has arrival end and the port of export, and the epicoele of described tank body is communicated with reducing gas outlet；Described heat exchanger tube includes one-level heat exchanger tube and secondary heat exchange pipe, and described one-level heat exchanger tube is positioned at above secondary heat exchange pipe, and in tank body, one-level heat exchanger tube region forms one-level heat transfer zone, and secondary heat exchange pipe region forms secondary heat exchange district.
Further, the detailed process of described continuity reduction and waste heat recovery is:
Material utilizes waste heat and carbon to carry out reduction reaction in continuity reducing zone, and to control the continuity recovery time be 40～50min, and the material through continuity reduction enters in heat transfer zone, adopts the mode of high-temperature material and air indirect heat exchange, makes temperature of charge be reduced.
Further, in step (2), drying grate high temperature section heat source adopts 1000～1050 DEG C of flue gases that the reduction waste gas from 800～850 DEG C of flue gases with secondary magnetization rotary kiln discharge that once magnetize rotary kiln discharge obtains after second-time burning；Drying grate low-temperature zone heat source adopts the hot-air discharged from waste-heat recovery device heat exchanger tube.
When iron ore carries out magnetizing roast in rotary kiln, the reason of general kiln body ring formation contacts with thermal-flame in kiln mainly due to 0～1mm fine particle iron ore so that is bonded on kiln wall and forms ring formation after the fusing of particulate iron ore high-temperature.This technique adopts when magnetizing 0～1mm fine particle iron ore after mixing more than 1mm high-temperature material and 0～1mm room temperature fine, mixed material is made to utilize the temperature of self waste heat to carry out iron ore magnetizing roast, adopting naked light to carry out heating material thus avoiding secondary magnetization rotary kiln, solving the kiln body ring formation problem that rotary kiln fine particle iron ore when magnetizing roast is prone to result in.
Specific in step (4), owing to the iron ore more than 1mm can be heated to 850～900 DEG C under once magnetizing rotary kiln not ring formation situation, the magnetizing roast wider range of iron ore simultaneously, generally can reach 600～900 DEG C, when 0～1mm grade iron ore and coal dust join after in 850～900 DEG C of magnetization iron ores, mixed material temperature can reach 700～800 DEG C, can meet the temperature needs of the magnetization of more than the 1mm iron ore degree of depth and 0～1mm grade iron ore magnetizing roast.By controlling the magnetizing time 20～30min of mixed material, mixed material can be made to magnetize rotary kiln when temperature reaches about 600 DEG C from secondary and to discharge.
The present invention is the magnetizing roast speed of raising 5～15mm grade iron ore, iron ore is adopted to first pass through the method that drying grate carries out oxidizing roasting before magnetizing roast, water of crystallization contained by iron ore and mechanical water can be made to be evaporated on the one hand, and then make inside iron ore, to become loose, it is easy to the entrance of reducing gas, the Fe in iron ore can be made on the other hand304, FeO initial oxidation be α-Fe2O3, then carry out follow-up magnetizing roast, thus the grain size of iron oxides is grown up before can making magnetizing roast, and then the metal recovery rate of iron ore concentrate can be improved.In addition, when 5～15mm grade iron ore magnetizing roast by with addition of a certain amount of particulate iron ore, not only increase the rotary kiln filling rate of 5～15mm grade iron ore, and make on the one hand the contact area of iron ore and reducing gas increase owing to adding particulate iron ore, decrease the voidage of material on the other hand, so that be easier to keep higher reducing atmosphere inside iron ore, and then improve quality and the speed of iron ore magnetizing roast.
Additionally, the present invention is provided with waste-heat recovery device after secondary magnetizes rotary kiln, roasted ore and carbon not only can be made further to magnetize reaction, and by with air indirect heat exchange, iron ore can be made to have preheated air when temperature is reduced to below 200 DEG C, making temperature of charge reach the purpose of anaerobic cooling while reducing, after preheating, air is available for the coal dust of this technique and dries, once magnetizes the equipment such as rotary kiln, drying grate and use simultaneously.
To sum up, the beneficial effects of the present invention is:
1, roasting quality is uniform, and each grade iron ore all can obtain thorough roasting, is absent from the phenomenon of bulky grain underburnt, little granule burning；
2, achieve fine and magnetize in rotary kiln without ring formation magnetization at the secondary of the flames of anger, reach the purpose of iron ore wholegrain level magnetizing roast；
3, in system, heat can be recycled, and effectively reduces energy consumption；
4, Iron grade is that 25～35% difficulties select iron ore of low ore grade after the magnetizing roast of this technique, and Iron grade can be made to be brought up to 56～60% by the 46～48% of high intensity magnetic separation；Metal recovery rate is brought up to 82～88% by the 66～68% of high intensity magnetic separation.
Accompanying drawing explanation
Fig. 1 is the structural representation of waste-heat recovery device of the present invention；
In figure, 1-tank body, 2-material inlet, 3-material outlet, 4-continues reducing zone, 5-one-level heat transfer zone, 6-secondary heat exchange district, 7-one-level heat exchanger tube, 8-secondary heat exchange pipe, and 9-reducing gas exports.
Detailed description of the invention
The selection of embodiment material
Iron ore selects grade to be 25～35%, SiO2Content is the iron ore of 25～48%.Reduction coal selects fixed carbon content to be the coal of 45～74%.
Embodiment 1
A kind of difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, comprises the technical steps that:
(1) iron ore grading: adopt broken method to make its granularity reach below 15mm the granularity iron ore more than 15mm, to 0～15mm grade iron ore initially with the method sieved, therefrom sub-elect 0～5mm, two grade iron ores of 5～15mm, then the method adopting selecting crude drugs with winnower, sub-elects 0～1mm, tri-grade iron ores of 1～3mm and 3～5mm from the iron ore that granularity is 0～5mm；In mass, the materials ratio of each size fraction ranges iron ore is: 5～15mm grade consumption is 25 parts, to control be 12 parts to 3～5mm grade, to control be 13 parts to 1～3mm grade, 0～1mm grade controls to be 28 parts；
(2) drying grate heated oxide: granularity is that 5～15mm iron ore adds from the entrance of drying grate, iron ore is in drying grate process, the heating-up temperature controlling material is 900～950 DEG C, heat time heating time is 20min, makes iron ore be dried, preheats and aoxidize；Drying grate high temperature section heat source adopts 1000～1050 DEG C of flue gases that the reduction waste gas from 800～850 DEG C of flue gases with secondary magnetization rotary kiln discharge that once magnetize rotary kiln discharge obtains after second-time burning；Drying grate low-temperature zone heat source adopts the hot-air discharged from waste-heat recovery device heat exchanger tube；
(3) rotary kiln baking is once magnetized: after 900～950 DEG C of ferric oxide ores discharged from drying grate mix with 3～5mm grade iron ore and 3 parts of 0～3mm sized coals, mixed material adds from the kiln tail once magnetizing rotary kiln, once magnetization rotary kiln end is provided with the outer heater for fuel, mixed material constantly overturns and from kiln Caudad kiln hood moving process in rotary kiln, it is heated gradually heating up and magnetizing roast, when iron ore moves to rotary kiln central region, from the coal dust once magnetizing rotary kiln end and spraying into 1～3mm grade iron ore and 2 parts of 0～1mm grades, magnetizing roast is proceeded after the coal powder second mixing of mixed material and 1～3mm grade iron ore and 0～1mm grade, controlling iron ore is 850～880 DEG C in the heating-up temperature once magnetized in rotary kiln, heat time heating time is 20min；
(4) secondary magnetization rotary kiln baking: add from secondary magnetization rotary kiln after once magnetizing 850～880 DEG C of premagnetization iron ores discharged in rotary kiln and 0～1mm grade iron ore, three mixing of 5 parts of 0～1mm grade coal dusts, secondary magnetization rotary kiln is not provided with heater, magnetizing mixed material in rotary kiln at secondary relies on the waste heat of self to carry out reduction reaction with reduction carbon, the recovery time controlling material is 25min, then magnetizes rotary kiln from secondary and discharges；
(5) continuity reduction and waste heat recovery: enter into waste-heat recovery device after the material of magnetizing roast magnetizes rotary kiln discharge from secondary, makes material utilize self waste heat carry out continuity reduction in waste-heat recovery device and material waste heat is reclaimed；
As shown in Figure 1, described waste-heat recovery device includes tank body 1, tank body 1 is provided with material inlet 2, material outlet 3, the epicoele of tank body is continuity reducing zone 4, cavity of resorption is heat transfer zone, being provided with heat exchanger tube in described heat transfer zone, described heat exchanger tube has arrival end and the port of export, and the epicoele of tank body 1 is communicated with reducing gas outlet 9；Described heat exchanger tube includes one-level heat exchanger tube 7 and secondary heat exchange pipe 8, and one-level heat exchanger tube 7 is positioned at above secondary heat exchange pipe 8, and in tank body 1, one-level heat exchanger tube 7 region forms one-level heat transfer zone 5, and secondary heat exchange pipe 8 region forms secondary heat exchange district 6；
The detailed process of described continuity reduction and waste heat recovery is: material utilizes waste heat and carbon to carry out reduction reaction in continuity reducing zone, and control continuity the recovery time be 50min, material through continuity reduction enters in heat transfer zone, adopt the mode of high-temperature material and air indirect heat exchange, make temperature of charge be reduced.
(6) ore grinding of roasted ore and magnetic separation: making its granularity reach-200 orders after the iron ore grinding after magnetizing roast and account for more than 80%, then adopt magnetic separation process to carry out ore dressing, after testing, the Iron concentrate grade obtained is 59%, and metal recovery rate is 88%.
Embodiment 2
Embodiment 2 and embodiment 1 are distinctive in that:
In step (1), the materials ratio of each size fraction ranges iron ore is: 5～15mm grade consumption is 30 parts, to control be 10 parts to 3～5mm grade, to control be 15 parts to 1～3mm grade, 0～1mm grade controls to be 25 parts；
In step (2), the heat time heating time controlling material is 15min；
In step (3), 900～950 DEG C of ferric oxide ores discharged from drying grate join after mixing with 3～5mm grade iron ore and 5 parts of 0～3mm sized coals once magnetization rotary kiln；When iron ore moves to rotary kiln central region, from the coal dust once magnetizing rotary kiln end and spraying into 1～3mm grade iron ore and 3 parts of 0～1mm grades, proceed magnetizing roast after the coal powder second mixing of mixed material and 1～3mm grade iron ore and 0～1mm grade, control iron ore the heating-up temperature once magnetized in rotary kiln be 860～890 DEG C, heat time heating time be 15min；
In step (4), add from secondary magnetization rotary kiln after once magnetizing 860～890 DEG C of premagnetization iron ores discharged in rotary kiln and 0～1mm grade iron ore, three mixing of 2 parts of 0～1mm grade coal dusts, the recovery time that control material magnetizes in rotary kiln at secondary is 30min, then magnetizes rotary kiln from secondary and discharges；
In step (5), the material continuity recovery time in waste-heat recovery device is 40min；
In step (6), after testing, the Iron concentrate grade obtained is 57.5%, and metal recovery rate is 86.8%.
Embodiment 3
Embodiment 3 and embodiment 1 are distinctive in that:
In step (1), the materials ratio of each size fraction ranges iron ore is: 5～15mm grade consumption is 35 parts, to control be 15 parts to 3～5mm grade, to control be 10 parts to 1～3mm grade, 0～1mm grade controls to be 35 parts；
In step (2), the heat time heating time controlling material is 25min；
In step (3), 900～950 DEG C of ferric oxide ores discharged from drying grate join after mixing with 3～5mm grade iron ore and 2 parts of 0～3mm sized coals once magnetization rotary kiln；When iron ore moves to rotary kiln central region, from the coal dust once magnetizing rotary kiln end and spraying into 1～3mm grade iron ore and 5 parts of 0～1mm grades, proceed magnetizing roast after the coal powder second mixing of mixed material and 1～3mm grade iron ore and 0～1mm grade, control iron ore the heating-up temperature once magnetized in rotary kiln be 870～900 DEG C, heat time heating time be 10min；
In step (4), add from secondary magnetization rotary kiln after once magnetizing 870～900 DEG C of premagnetization iron ores discharged in rotary kiln and 0～1mm grade iron ore, three mixing of 3 parts of 0～1mm grade coal dusts, the recovery time that control material magnetizes in rotary kiln at secondary is 20min, then magnetizes rotary kiln from secondary and discharges；
In step (5), the material continuity recovery time in waste-heat recovery device is 45min；
In step (6), after testing, the Iron concentrate grade obtained is 56.5%, and metal recovery rate is 87.5%.
Claims (5)
1. a difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterised in that comprise the technical steps that:
(1) iron ore grading: adopt broken method to make its granularity reach below 15mm iron ore, to 0～15mm grade iron ore initially with the method sieved, 0～5mm, two grade iron ores of 5～15mm are sub-elected from 0～15mm grade iron ore, then the method adopting selecting crude drugs with winnower, from the iron ore that granularity is 0～5mm, sorting is 0～1mm, tri-grade iron ores of 1～3mm and 3～5mm；By weight, the materials ratio of each size fraction ranges iron ore is: it is 25～35 parts that 5～15mm grade controls, to control be 10～15 parts to 3～5mm grade, to control be 10～15 parts to 1～3mm grade, 0～1mm grade controls to be 25～35 parts；Above-mentioned each size fraction ranges does not all include lower limit, but includes higher limit；
(2) drying grate heated oxide: granularity is that 5～15mm iron ore adds from the entrance of drying grate, iron ore is in drying grate heating process, the discharge temperature controlling material is 900～950 DEG C, heat time heating time is 15～25min, makes iron ore be dried, preheats and aoxidize；
(3) rotary kiln baking is once magnetized: after 900～950 DEG C of ferric oxide ores and the 3～5mm grade iron ore discharged from drying grate and 0～3mm sized coal of 2～5 parts mix, mixed material adds from the kiln tail once magnetizing rotary kiln, once magnetization rotary kiln end is provided with the outer heater for fuel, mixed material constantly overturns and from kiln Caudad kiln hood moving process in rotary kiln, it is heated gradually heating up and magnetizing roast, when iron ore moves to rotary kiln central region, from once magnetizing the coal dust that rotary kiln end sprays into 0～1mm grade of 1～3mm grade iron ore and 2～5 parts, magnetizing roast is proceeded after the coal powder second mixing of mixed material and 1～3mm grade iron ore and 0～1mm grade, controlling iron ore is 850～900 DEG C in the heating-up temperature once magnetized in rotary kiln, heat time heating time is 10～20min；
(4) secondary magnetization rotary kiln baking: magnetize rotary kiln from secondary after mixing for three times from the 0～1mm grade coal dust once magnetizing 850～900 DEG C of premagnetization iron ores discharged in rotary kiln and 0～1mm grade iron ore, 2～5 parts and add, secondary magnetization rotary kiln is not provided with heater, magnetizing mixed material in rotary kiln at secondary relies on the waste heat of self to carry out reduction reaction with reduction carbon, the recovery time controlling material is 20～30min, then magnetizes rotary kiln from secondary and discharges；
(5) ore grinding of roasted ore and magnetic separation: making its granularity reach-200 orders after the iron ore grinding after magnetizing roast and account for more than 80%, then adopt magnetic separation process to carry out ore dressing, obtaining grade is 56～60%, and metal recovery rate is the Iron concentrate of 82～88%.
2. a kind of difficulty according to claim 1 selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterised in that also comprise the steps: between step (4) and step (5)
Continuity reduction and waste heat recovery: enter into waste-heat recovery device after the material of magnetizing roast magnetizes rotary kiln discharge from secondary, make material utilize self waste heat carry out continuity reduction in waste-heat recovery device and material waste heat is reclaimed.
3. a kind of difficulty according to claim 2 selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterized in that, described waste-heat recovery device includes tank body, described tank body is provided with material inlet, material outlet, the epicoele of described tank body is continuity reducing zone, and cavity of resorption is heat transfer zone, is provided with heat exchanger tube in described heat transfer zone, described heat exchanger tube has arrival end and the port of export, and the epicoele of described tank body is communicated with reducing gas outlet；Described heat exchanger tube includes one-level heat exchanger tube and secondary heat exchange pipe, and described one-level heat exchanger tube is positioned at above secondary heat exchange pipe, and in tank body, one-level heat exchanger tube region forms one-level heat transfer zone, and secondary heat exchange pipe region forms secondary heat exchange district.
4. a kind of difficulty according to claim 3 selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterised in that the detailed process of described continuity reduction and waste heat recovery is:
Material utilizes waste heat and carbon to carry out reduction reaction in continuity reducing zone, and to control the continuity recovery time be 40～50min, and the material through continuity reduction enters in heat transfer zone, adopts the mode of high-temperature material and air indirect heat exchange, makes temperature of charge be reduced.
5. a kind of difficulty according to claim 4 selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterized in that, in step (2), drying grate high temperature section heat source adopts 1000～1050 DEG C of flue gases that the reduction waste gas from 800～850 DEG C of flue gases with secondary magnetization rotary kiln discharge that once magnetize rotary kiln discharge obtains after second-time burning；Drying grate low-temperature zone heat source adopts the hot-air discharged from waste-heat recovery device heat exchanger tube.
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| CN104745804A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for improving grade and recovery rate of roasting ore separation iron ore |
| CN104745805A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Whole-grade powdery iron ore magnetizing and roasting process based on three tandem rotary kilns |
| CN104846189B (en) * | 2015-06-05 | 2017-07-11 | 中国地质科学院矿产综合利用研究所 | Fluidized roasting separation method for siderite-containing mixed iron ore |
| CN107377207A (en) * | 2017-07-11 | 2017-11-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online |
| CN108754131B (en) * | 2018-06-14 | 2020-02-18 | 鞍钢股份有限公司 | Sintering production method for optimizing fuel matching |
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