CN104164556A - Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore - Google Patents
Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore Download PDFInfo
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Abstract
The invention provides a chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore. The process mainly comprises the following steps: (1) particle size grading of the iron ore: a step of selecting iron ore respectively with particle sizes of 5 to 15 mm, 3 to 5 mm, 1 to 3 mm and 0 to 1 mm from iron ore with particle sizes of 0 to 15 mm; (2) heating and oxidizing in a chain grate: a step of drying, preheating and oxidizing the iron ore with particle sizes of 5 to 15 mm in the chain grate; (3) roasting in a primary magnetizing rotary kiln: a step of subjecting the oxidized iron ore discharged from the chain grate, the iron ore with particle sizes of 3 to 5 mm and the iron ore with particle sizes of 1 to 3 mm to magnetic roasting in the primary rotary kiln; (4) roasting in a secondary magnetizing rotary kiln: a step of allowing the premagnetized iron ore discharged from the primary rotary kiln and the iron ore with particle sizes of 0 to 1 mm to undergo a reduction reaction with reductive carbon in the secondary rotary kiln in virtue of waste heat of the iron ore; and (5) grinding and magnetic separation of the roasted ore.
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, there is exhaustion along with the continuous exploitation of domestic high grade iron ore, and the rising steadily of iron ore price, make iron ore of low ore grade and compound symbiotic iron ore stone there is larger extraction value, and become the important directions of in the future utilizing.
In the recovery process of iron ore of low ore grade, generally can produce 40～50% granularities is the following powdered iron ore of 15mm.At present, the method for utilizing of powder low grade iron ore mainly contains magnetic separation, magnetizing roasting and direct-reduction etc.Be 25～35% refractory iron ores for the grade that need to carry out magnetizing roasting, granularity is that the domestic shaft furnace that generally adopts of iron ore more than 15mm carries out producing iron fine powder through magnetic selection method again after magnetizing roasting, and be less than the iron ore of 15mm for granularity, generally adopt ore grinding-high intensity magnetic separation process, rotary kiln magnetizing roasting-mill to select technique utilization.
Domestic while adopting high intensity magnetic separation process to dispose for 0～15mm refractory iron ore, because the less and crystal grain of iron ore magnetic is fine, the iron concentrate grade obtaining is 46～48%, iron recovery is 67% left and right, has caused the larger wasting of resources.In the time that 0～15mm refractory iron ore adopts rotary kiln to carry out the magnetizing roasting of wholegrain level, because iron ore granularity difference is larger, easily cause the ring formation phenomenon of quality non-uniform phenomenon and the rotary kiln body of macrobead underburnt in iron ore magnetizing roasting, small-particle burning.In the time that 0～15mm refractory iron ore adopts direct reduction process to utilize, because the iron grade of ore is lower and silicone content is higher, metallization iron powder productive rate that direct-reduction obtains is lower, metal recovery rate is lower and foreign matter content is higher, is difficult to meet the needs that steel-making or electric furnace are produced.
In addition, domestic in the time adopting rotary kiln to carry out the magnetizing roasting of wholegrain level to 0～15mm powdered iron ore, the ring formation problem producing for 0～1mm fine particle iron ore, for restriction fine particle iron ore enters rotary kiln, 0～1mm fine is sorted out from iron ore, and adopt ore grinding, coal blending pelletizing, rotary kiln magnetizing roasting, the methods such as mill choosing are utilized 0～1mm fine, due to particulate iron ore produce carbonaceous pelletizing in rotary kiln in magnetizing roasting process intensity lower, be difficult to meet the requirement of pellet magnetizing roasting, still easily cause the ring formation phenomenon of rotary kiln simultaneously.For improving the intensity of pellet, when adopting more mineral binder bond (as wilkinite) Shi Zehui to reduce the iron grade of pellet, but in the time adopting organic binder bond, although there is at low temperatures higher intensity, but in the time that temperature reaches 700 DEG C of left and right, binding agent can lose cohesive strength and produce powder phenomenon-tion.
Aspect the size classification of iron ore, the domestic grading range of generally determining granularity according to the complexity of different grain size scope iron ore screening, not be not issued to even roasting quality and determine rational size range at certain roasting time, maturing temperature according to iron ore, thereby cause after iron ore size classification the phenomenon that also exists roasting quality inequality for each size range iron ore when the magnetizing roasting.
Summary of the invention
The present invention is directed at present domestic in the time that processing 0～15mm difficulty is selected iron ore of low ore grade, adopt rotary kiln to carry out that the granularity difference that exists in magnetizing roasting process is large, roasting quality is uneven, kiln body is prone to ring formation and the lower problem of metal recovery rate, provides a kind of difficulty to select iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process.
For this reason, the present invention adopts following technical scheme:
A kind of difficulty is selected iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, comprises following processing step:
(1) iron ore size classification: adopt broken method that its granularity is reached below 15mm iron ore, first 0～15mm grade iron ore is adopted to the method for screening, from 0～15mm grade iron ore, sub-elect 0～5mm, two grade iron ores of 5～15mm, then adopt the method for selection by winnowing, the iron ore that is 0～5mm from granularity, divide and elect 0～1mm, 1～3mm and tri-grade iron ores of 3～5mm as; By weight, the materials ratio of each grade scope iron ore is: the control of 5～15mm grade is that 25～35 parts, the control of 3～5mm grade are that 10～15 parts, the control of 1～3mm grade are that 10～15 parts, the control of 0～1mm grade are 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 through drying grate heat-processed, controlling the outflow temperature of material and be 900～950 DEG C, heat-up time is 15～25min, makes that iron ore is dried, preheating and oxidation;
(3) once magnetize rotary kiln baking: 0～3mm sized coal of 900～950 DEG C of ferric oxide ores of discharging from drying grate and 3～5mm grade iron ore and 2～5 parts mixes, mixture adds from the kiln tail that once magnetizes rotary kiln, once magnetize rotary kiln end and be provided with the outer heating unit for fuel, mixture is constantly upset from kiln Caudad kiln hood moving process in rotary kiln, carry out gradually heat temperature raising and magnetizing roasting, in the time that iron ore moves to rotary kiln central region, spray into the coal dust of 0～1mm grade of 1～3mm grade iron ore and 2～5 parts from once magnetizing rotary kiln end, mixture is proceeded magnetizing roasting after mixing with the coal powder second of 1～3mm grade iron ore and 0～1mm grade, controlling iron ore is 850～900 DEG C in the Heating temperature of once magnetizing in rotary kiln, be 10～20min heat-up time, can make iron ore reach 70～80% from the susceptibility of once magnetizing rotary kiln discharge,
(4) secondary magnetization rotary kiln baking: from once magnetizing 850～900 DEG C of premagnetization iron ores of discharging in rotary kiln and 0～1mm grade iron ore, 0～1mm grade coal dust of 2～5 parts magnetizes rotary kiln from secondary mixing for three times and adds, secondary magnetization rotary kiln does not arrange heating unit, in secondary magnetization rotary kiln, mixture relies on the waste heat of self and reduction carbon to carry out reduction reaction, the recovery time of controlling material is 20～30min, then discharges from secondary magnetization rotary kiln;
(5) ore grinding of roasted ore and magnetic separation: make its granularity reach-200 orders after the iron ore grinding after magnetizing roasting and account for more than 80%, then adopt magnetic separation process to carry out ore dressing, obtaining grade is 56～60%, the iron fine powder that metal recovery rate is 82～88%.
Further, between step (4) and step (5), also comprise the steps:
Continuity reduction and waste heat recovery: the material through magnetizing roasting enters into waste-heat recovery device from secondary magnetization rotary kiln is discharged, make material utilize self waste heat continue in waste-heat recovery device and reduce and material waste heat is reclaimed.
Further, described waste-heat recovery device comprises tank body, described tank body is provided with material inlet, material outlet, the epicoele of described tank body is continuity reduction zone, cavity of resorption is heat transfer zone, in described heat transfer zone, be provided with heat transfer tube, described heat transfer tube has inlet end and exit end, and the epicoele of described tank body is communicated with reducing gas outlet; Described heat transfer tube comprises one-level heat transfer tube and secondary heat exchange pipe, and described one-level heat transfer tube is positioned at secondary heat exchange pipe top, and in tank body, one-level heat transfer 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 in reduction zone, and to control the continuity recovery time be 40～50min, enters in heat transfer zone through the material of continuity reduction, and the mode of employing high-temperature material and air indirect heat exchange, is reduced temperature of charge.
Further, in step (2), drying grate high temperature section heat source adopts 1000～1050 DEG C of flue gases that obtain after secondary combustion from once magnetizing 800～850 DEG C of flue gases that rotary kiln discharges and the reduction waste gas of secondary magnetization rotary kiln discharge; Drying grate low-temperature zone heat source adopts the warm air of discharging from waste-heat recovery device heat transfer tube.
When iron ore carries out magnetizing roasting in rotary kiln, the reason of general kiln body ring formation is mainly because 0～1mm fine particle iron ore contacts with thermal-flame in kiln, is bonded on kiln wall after particulate iron ore high-temperature is melted and forms ring formation.After this technique adopts and is greater than 1mm high-temperature material and mixes with 0～1mm normal temperature fine in the time of magnetization 0～1mm fine particle iron ore, make mixture utilize the temperature of self waste heat to carry out iron ore magnetizing roasting, thereby avoid the secondary magnetization rotary kiln to adopt naked light to carry out heating material, solved rotary kiln fine particle iron ore in the time of magnetizing roasting and be easy to cause the kiln body ring formation problem producing.
In step (4), because the iron ore that is greater than 1mm can not be heated to 850～900 DEG C in ring formation situation once magnetizing rotary kiln, the magnetizing roasting wider range of iron ore simultaneously, generally can reach 600～900 DEG C, after 0～1mm grade iron ore and coal dust join in 850～900 DEG C of magnetization iron ores, mixture temperature can reach 700～800 DEG C, can meet the temperature needs of the above iron ore degree of depth magnetization of 1mm and the magnetizing roasting of 0～1mm grade iron ore.By controlling the magnetizing time 20～30min of mixture, can make mixture discharge from secondary magnetization rotary kiln in the time that temperature reaches 600 DEG C of left and right.
The present invention is the magnetizing roasting speed that improves 5～15mm grade iron ore, the method that adopts iron ore first to carry out oxidizing roasting through drying grate before magnetizing roasting, can make the contained crystal water of iron ore and mechanical water be evaporated on the one hand, and then make iron ore inside become loose, be convenient to entering of reducing gas, can make on the other hand the Fe in iron ore
30
4, FeO initial oxidation is α-Fe
2o
3, then carry out follow-up magnetizing roasting, thus can make the grain fineness number of the front ferriferous oxide of magnetizing roasting be grown up, and then can improve the metal recovery rate of iron ore concentrate.In addition, in the time of the magnetizing roasting of 5～15mm grade iron ore, pass through with addition of a certain amount of particulate iron ore, not only improve the rotary kiln filling ratio of 5～15mm grade iron ore, and owing to adding particulate iron ore to make on the one hand the contact area of iron ore and reducing gas increase, reduce on the other hand the voidage of material, thereby make iron ore inside more easily keep higher reducing atmosphere, and then improved quality and the speed of iron ore magnetizing roasting.
In addition, the present invention is provided with waste-heat recovery device after secondary magnetization rotary kiln, not only can make roasted ore and carbon carry out further magnetization reacts, and by with air indirect heat exchange, can make iron ore in the time that temperature is reduced to below 200 DEG C preheating air, when temperature of charge is reduced, reached the cooling object of anaerobic, after preheating simultaneously, air can be dried for the coal dust of this technique, once magnetize the equipment such as rotary kiln, drying grate and carry out.
To sum up, beneficial effect of the present invention is:
1, roasting quality is even, and each grade iron ore all can obtain thorough roasting, does not have the phenomenon of macrobead underburnt, small-particle burning;
2, realize fine and magnetized without ring formation in the secondary magnetization rotary kiln of the flames of anger, reached the object of iron ore wholegrain level magnetizing roasting;
3, in system, heat can obtain recycle, effectively reduces energy consumption;
4, iron grade is that 25～35% difficulties select iron ore of low ore grade after the magnetizing roasting of this technique, can make iron grade bring up to 56～60% by 46～48% of high intensity magnetic separation; Metal recovery rate brings up to 82～88% by 66～68% of high intensity magnetic separation.
Brief description of the drawings
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 reduction zone, 5-one-level heat transfer zone, 6-secondary heat exchange district, 7-one-level heat transfer tube, 8-secondary heat exchange pipe, the outlet of 9-reducing gas.
Embodiment
the selection of embodiment material
Iron ore selects that grade is 25～35%, SiO
2content is 25～48% iron ore.Reduction selects with coal the coal that fixed carbon content is 45～74%.
embodiment 1
A kind of difficulty is selected iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, comprises following processing step:
(1) iron ore size classification: the iron ore that granularity is greater than to 15mm adopts broken method that its granularity is reached below 15mm, first 0～15mm grade iron ore is adopted to the method for screening, therefrom sub-elect 0～5mm, two grade iron ores of 5～15mm, then adopt the method for selection by winnowing, the iron ore that is 0～5mm from granularity, sub-elect tri-grade iron ores of 0～1mm, 1～3mm and 3～5mm; In mass, the materials ratio of each grade scope iron ore is: 5～15mm grade consumption is that 25 parts, the control of 3～5mm grade are that 12 parts, the control of 1～3mm grade are that 13 parts, the control of 0～1mm grade are 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 through drying grate process, controlling the Heating temperature of material and be 900～950 DEG C, heat-up time is 20min, makes that iron ore is dried, preheating and oxidation; Drying grate high temperature section heat source adopts 1000～1050 DEG C of flue gases that obtain after secondary combustion from once magnetizing 800～850 DEG C of flue gases that rotary kiln discharges and the reduction waste gas of secondary magnetization rotary kiln discharge; Drying grate low-temperature zone heat source adopts the warm air of discharging from waste-heat recovery device heat transfer tube;
(3) once magnetize rotary kiln baking: 900～950 DEG C of ferric oxide ores of discharging from drying grate mix with 3～5mm grade iron ore and 3 parts of 0～3mm sized coals, mixture adds from the kiln tail that once magnetizes rotary kiln, once magnetize rotary kiln end and be provided with the outer heating unit for fuel, mixture is constantly upset from kiln Caudad kiln hood moving process in rotary kiln, carry out gradually heat temperature raising and magnetizing roasting, in the time that iron ore moves to rotary kiln central region, spray into the coal dust of 1～3mm grade iron ore and 2 parts of 0～1mm grades from once magnetizing rotary kiln end, mixture is proceeded magnetizing roasting after mixing with the coal powder second of 1～3mm grade iron ore and 0～1mm grade, controlling iron ore is 850～880 DEG C in the Heating temperature of once magnetizing in rotary kiln, be 20min heat-up time,
(4) secondary magnetization rotary kiln baking: magnetize rotary kiln from secondary and add from once magnetizing 850～880 DEG C of premagnetization iron ores of discharging in rotary kiln and mixing for three times with 0～1mm grade iron ore, 5 parts of 0～1mm grade coal dusts, secondary magnetization rotary kiln does not arrange heating unit, in secondary magnetization rotary kiln, mixture relies on the waste heat of self and reduction carbon to carry out reduction reaction, the recovery time of controlling material is 25min, then discharges from secondary magnetization rotary kiln;
(5) continuity reduction and waste heat recovery: the material through magnetizing roasting enters into waste-heat recovery device from secondary magnetization rotary kiln is discharged, makes material utilize self waste heat continue in waste-heat recovery device and reduces and material waste heat is reclaimed;
As shown in Figure 1, described waste-heat recovery device comprises tank body 1, tank body 1 is provided with material inlet 2, material outlet 3, the epicoele of tank body is continuity reduction zone 4, cavity of resorption is heat transfer zone, in described heat transfer zone, be provided with heat transfer tube, described heat transfer tube has inlet end and exit end, and the epicoele of tank body 1 is communicated with reducing gas outlet 9; Described heat transfer tube comprises one-level heat transfer tube 7 and secondary heat exchange pipe 8, and one-level heat transfer tube 7 is positioned at secondary heat exchange pipe 8 tops, and the interior one-level heat transfer tube of tank body 17 regions form one-level heat transfer zone 5, secondary heat exchange pipe 8 formation secondary heat exchange districts 6, regions;
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 reduction zone, and the control continuity recovery time is 50min, material through continuity reduction enters in heat transfer zone, the mode that adopts high-temperature material and air indirect heat exchange, is reduced temperature of charge.
(6) ore grinding of roasted ore and magnetic separation: make its granularity reach-200 orders after the iron ore grinding after magnetizing roasting and account for more than 80%, then adopt magnetic separation process to carry out ore dressing, after testing, the iron fine powder grade obtaining is 59%, and metal recovery rate is 88%.
embodiment 2
Embodiment 2 is with the difference of embodiment 1:
In step (1), the materials ratio of each grade scope iron ore is: 5～15mm grade consumption is that 30 parts, the control of 3～5mm grade are that 10 parts, the control of 1～3mm grade are that 15 parts, the control of 0～1mm grade are 25 parts;
In step (2), be 15min the heat-up time of controlling material;
In step (3), 900～950 DEG C of ferric oxide ores of discharging from drying grate mix with 3～5mm grade iron ore and 5 parts of 0～3mm sized coals, join and once magnetize in rotary kiln; In the time that iron ore moves to rotary kiln central region, spray into the coal dust of 1～3mm grade iron ore and 3 parts of 0～1mm grades from once magnetizing rotary kiln end, mixture is proceeded magnetizing roasting after mixing with the coal powder second of 1～3mm grade iron ore and 0～1mm grade, and controlling iron ore is that 860～890 DEG C, heat-up time are 15min once magnetizing Heating temperature in rotary kiln;
In step (4), from once magnetizing 860～890 DEG C of premagnetization iron ores of discharging in rotary kiln and mixing for three times with 0～1mm grade iron ore, 2 parts of 0～1mm grade coal dusts, add from secondary magnetization rotary kiln, controlling the recovery time of material in secondary magnetization rotary kiln is 30min, then discharges from secondary magnetization rotary kiln;
In step (5), the continuity recovery time of material in waste-heat recovery device is 40min;
In step (6), after testing, the iron fine powder grade obtaining is 57.5%, and metal recovery rate is 86.8%.
embodiment 3
Embodiment 3 is with the difference of embodiment 1:
In step (1), the materials ratio of each grade scope iron ore is: 5～15mm grade consumption is that 35 parts, the control of 3～5mm grade are that 15 parts, the control of 1～3mm grade are that 10 parts, the control of 0～1mm grade are 35 parts;
In step (2), be 25min the heat-up time of controlling material;
In step (3), 900～950 DEG C of ferric oxide ores of discharging from drying grate mix with 3～5mm grade iron ore and 2 parts of 0～3mm sized coals, join and once magnetize in rotary kiln; In the time that iron ore moves to rotary kiln central region, spray into the coal dust of 1～3mm grade iron ore and 5 parts of 0～1mm grades from once magnetizing rotary kiln end, mixture is proceeded magnetizing roasting after mixing with the coal powder second of 1～3mm grade iron ore and 0～1mm grade, and controlling iron ore is that 870～900 DEG C, heat-up time are 10min once magnetizing Heating temperature in rotary kiln;
In step (4), from once magnetizing 870～900 DEG C of premagnetization iron ores of discharging in rotary kiln and mixing for three times with 0～1mm grade iron ore, 3 parts of 0～1mm grade coal dusts, add from secondary magnetization rotary kiln, controlling the recovery time of material in secondary magnetization rotary kiln is 20min, then discharges from secondary magnetization rotary kiln;
In step (5), the continuity recovery time of material in waste-heat recovery device is 45min;
In step (6), after testing, the iron fine powder grade obtaining is 56.5%, and metal recovery rate is 87.5%.
Claims (5)
1. difficulty is selected iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterized in that, comprises following processing step:
(1) iron ore size classification: adopt broken method that its granularity is reached below 15mm iron ore, first 0～15mm grade iron ore is adopted to the method for screening, from 0～15mm grade iron ore, sub-elect 0～5mm, two grade iron ores of 5～15mm, then adopt the method for selection by winnowing, the iron ore that is 0～5mm from granularity, divide and elect 0～1mm, 1～3mm and tri-grade iron ores of 3～5mm as; By weight, the materials ratio of each grade scope iron ore is: the control of 5～15mm grade is that 25～35 parts, the control of 3～5mm grade are that 10～15 parts, the control of 1～3mm grade are that 10～15 parts, the control of 0～1mm grade are 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 through drying grate heat-processed, controlling the outflow temperature of material and be 900～950 DEG C, heat-up time is 15～25min, makes that iron ore is dried, preheating and oxidation;
(3) once magnetize rotary kiln baking: 0～3mm sized coal of 900～950 DEG C of ferric oxide ores of discharging from drying grate and 3～5mm grade iron ore and 2～5 parts mixes, mixture adds from the kiln tail that once magnetizes rotary kiln, once magnetize rotary kiln end and be provided with the outer heating unit for fuel, mixture is constantly upset from kiln Caudad kiln hood moving process in rotary kiln, carry out gradually heat temperature raising and magnetizing roasting, in the time that iron ore moves to rotary kiln central region, spray into the coal dust of 0～1mm grade of 1～3mm grade iron ore and 2～5 parts from once magnetizing rotary kiln end, mixture is proceeded magnetizing roasting after mixing with the coal powder second of 1～3mm grade iron ore and 0～1mm grade, controlling iron ore is 850～900 DEG C in the Heating temperature of once magnetizing in rotary kiln, be 10～20min heat-up time,
(4) secondary magnetization rotary kiln baking: from once magnetizing 850～900 DEG C of premagnetization iron ores of discharging in rotary kiln and 0～1mm grade iron ore, 0～1mm grade coal dust of 2～5 parts magnetizes rotary kiln from secondary mixing for three times and adds, secondary magnetization rotary kiln does not arrange heating unit, in secondary magnetization rotary kiln, mixture relies on the waste heat of self and reduction carbon to carry out reduction reaction, the recovery time of controlling material is 20～30min, then discharges from secondary magnetization rotary kiln;
(5) ore grinding of roasted ore and magnetic separation: make its granularity reach-200 orders after the iron ore grinding after magnetizing roasting and account for more than 80%, then adopt magnetic separation process to carry out ore dressing, obtaining grade is 56～60%, the iron fine powder that metal recovery rate is 82～88%.
2. a kind of difficulty according to claim 1 is selected iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterized in that, between step (4) and step (5), also comprises the steps:
Continuity reduction and waste heat recovery: the material through magnetizing roasting enters into waste-heat recovery device from secondary magnetization rotary kiln is discharged, make material utilize self waste heat continue in waste-heat recovery device and reduce and material waste heat is reclaimed.
3. a kind of difficulty according to claim 2 is selected 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 comprises tank body, described tank body is provided with material inlet, material outlet, the epicoele of described tank body is continuity reduction zone, and cavity of resorption is heat transfer zone, is provided with heat transfer tube in described heat transfer zone, described heat transfer tube has inlet end and exit end, and the epicoele of described tank body is communicated with reducing gas outlet; Described heat transfer tube comprises one-level heat transfer tube and secondary heat exchange pipe, and described one-level heat transfer tube is positioned at secondary heat exchange pipe top, and in tank body, one-level heat transfer 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 is selected iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process, it is characterized 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 in reduction zone, and to control the continuity recovery time be 40～50min, enters in heat transfer zone through the material of continuity reduction, and the mode of employing high-temperature material and air indirect heat exchange, is reduced temperature of charge.
5. a kind of difficulty according to claim 4 is selected 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 obtain after secondary combustion from once magnetizing 800～850 DEG C of flue gases that rotary kiln discharges and the reduction waste gas of secondary magnetization rotary kiln discharge; Drying grate low-temperature zone heat source adopts the warm air of discharging from waste-heat recovery device heat transfer tube.
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| 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 |
| 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 |
| CN104846189A (en) * | 2015-06-05 | 2015-08-19 | 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 |
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| CN101457291A (en) * | 2007-12-12 | 2009-06-17 | 范英俊 | Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
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| CN104745802A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for magnetizing roasting of tunnel kiln of iron ores with particle sizes of 15mm or less than 15mm |
| 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 |
| 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 |
| CN104846189A (en) * | 2015-06-05 | 2015-08-19 | 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 |
| CN108754131A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | A kind of sintering production method of optimization fuel collocation |
| CN108754131B (en) * | 2018-06-14 | 2020-02-18 | 鞍钢股份有限公司 | Sintering production method for optimizing fuel matching |
| CN111748684A (en) * | 2020-07-08 | 2020-10-09 | 酒泉钢铁(集团)有限责任公司 | Iron ore grate-rotary kiln shallow hydrogen metallurgy iron ore concentrate production process and system |
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