CN103468934B - Powdery difficulty selects iron ore of low ore grade multistage fluidised form magnetizing roasting method - Google Patents

Powdery difficulty selects iron ore of low ore grade multistage fluidised form magnetizing roasting method Download PDF

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CN103468934B
CN103468934B CN201310355410.3A CN201310355410A CN103468934B CN 103468934 B CN103468934 B CN 103468934B CN 201310355410 A CN201310355410 A CN 201310355410A CN 103468934 B CN103468934 B CN 103468934B
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ore
roasting
iron ore
heater
furnace
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CN103468934A (en
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权芳民
王明华
秦积峰
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Abstract

The invention provides a kind of powdery difficulty selects the coal-based magnetization roasting furnace of the multistage fluidised form of iron ore of low ore grade and the powdery difficulty that utilizes this stoving oven to carry out to select iron ore of low ore grade magnetizing roasting method.Described stoving oven comprises cylindrical furnace, be provided with some dividing plates in body of heater, body of heater center is equipped with rotating shaft, and body of heater top is provided with material inlet and induced draft fan, bottom of furnace body is provided with discharge port, and the top of body of heater, middle part, bottom are provided with first successively and enter mouth, second and enter mouth and the 3rd and enter mouth; Pond is provided with below discharge port; Described dividing plate is provided with takes off arm, described in take off arm and be connected with rotating shaft; Described dividing plate also offers blanking hole.Magnetization roasting furnace of the present invention has that in-furnace temperature setting range is large, control climate flexibly, gas-solid contact area is large, unit volume production capacity is high, reduction reaction speed, Armco magnetic iron transformation efficiency advantages of higher, is the better magnetizing roasting equipment that process powdery difficulty selects low-grade specularite, rhombohedral iron ore, limonite and spathic iron ore.

Description

Powdery difficulty selects iron ore of low ore grade multistage fluidised form magnetizing roasting method
Technical field
The invention belongs to metallurgical technology field, relate to a kind of powdery difficulty and select the coal-based magnetization roasting furnace of the multistage fluidised form of iron ore of low ore grade and the powdery difficulty that utilizes this stoving oven to carry out to select iron ore of low ore grade magnetizing roasting method.
Background technology
China's iron ore resource is mostly the poor iron ore of average iron content less than 35%, iron mineral in these iron ores mainly exists with forms such as specularite, spathic iron ore, limonite and rhombohedral iron ore, and the disseminated grain size of ore is thin and association has the Iron-containing silicate that a large amount of physico-chemical property is close.Adopt these Low-grade and hard-to-separate iron ore stone resources of conventional ore-dressing technique process such as gravity preparation, magnetic separation, flotation, be not only difficult to obtain high-quality iron ore concentrate, but also can produce a considerable number of difficulty and choose ore deposit, economic benefit is poor.At present, iron ore magnetizing roasting-magnetic separation technology is the difficult ore dressing of process comparatively effective means.Iron ore magnetic roasting process can be divided into shaft roasting, rotary kiln baking, fluidized bed roasting and Flash Smelting Furnace roasting by the structure formation of stoving oven.Magnetizing roasting technology mainly contains the magnetizing roasting of gas base and coal-based magnetizing roasting.
Wherein, shaft furnace is generally used for process particle diameter at the lump ore of more than 15mm, there is little grade lump ore and crosses reduction, and large grade lump ore owes the phenomenon of reducing, and due to the iron ore specific surface area of volume particle size less, thus iron ore and reductive agent (CO and H 2deng) touch opportunity few, its reduction process is carried out comparatively slow, causes the output of shaft roasting lower; Rotary kiln, for the treatment of the fine ore of particle diameter at below 15mm, also exists the problems such as ore reduction is uneven, the easy ring formation of rotary kiln; Fluidizing furnace (mainly process with flash roaster a kind of type of furnace that grade is below 3mm ore, all will get well, but also there is the uneven and roasting high in cost of production problem of reduction of iron ore by the magnetizing roasting quality of its ore comparatively shaft furnace and rotary kiln.
Summary of the invention
The object of the invention is to for prior art Problems existing, provide a kind of and magnetize efficiency and production capacity is high, production cost is low, compact construction and the little powdery difficulty of floor space selects the multistage fluidised form magnetization roasting furnace of iron ore of low ore grade.
Another object of the present invention is to provide a kind of powdery difficulty utilizing above-mentioned magnetization roasting furnace to carry out to select the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade.
For this reason, the present invention adopts following technical scheme:
A kind of powdery difficulty selects the multistage fluidised form magnetization roasting furnace of iron ore of low ore grade, comprise cylindrical furnace, some dividing plates are provided with in described body of heater, body of heater center is equipped with rotating shaft, body of heater top is provided with material inlet and induced draft fan, bottom of furnace body is provided with discharge port, and the top of body of heater, middle part, bottom are provided with first successively and enter mouth, second and enter mouth and the 3rd and enter mouth; Pond is provided with below described discharge port; Described dividing plate is provided with takes off arm, described in take off arm and be connected with rotating shaft; Described dividing plate also offers blanking hole, and the feed opening in adjacent separator is crisscross arranged.
Further, also comprise the first combustion chamber and the second combustion chamber, described first enters mouth and the first combustion chamber, and described second enters mouth and the 3rd enters mouth and the second combustion chamber.
Further, described in take off arm and be provided with grilled teeth, described grilled teeth offers and takes off perforation.Taking off perforation can facilitate material to pass, and prevents from taking off material when arm rotates and piles up.
The powdery difficulty utilizing above-mentioned magnetization roasting furnace to carry out selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, comprises following processing step:
(1) the powdered iron ore of below 3mm and the coal dust of below 1mm are prepared burden by the weight ratio of 95 ~ 96%:4 ~ 5%, after batching, iron ore powder is mixed with coal dust, obtain compound;
(2) compound is sent in multistage fluidised form magnetization roasting furnace body of heater by material inlet; High-temperature flue gas enters mouth, second by first and enters mouth and the 3rd and enter mouth and enter in body of heater, and is constantly risen by the blanking hole on dividing plate, makes temperature in body of heater remain on 650-750 DEG C;
(3) take off arm under rotating shaft drives, constantly rotate at dividing plate upper surface, constantly stir the compound on dividing plate, compound is falling into lower partition through blanking hole; Compound is moving downward in process, constantly carries out heat exchange, complete drying, preheating and roasting successively with the high-temperature flue gas risen;
(4) roasted ore obtained after roasting falls into bottom of furnace body low-temperature zone, and cool taking off under arm tipping effect, cooled roasted ore enters pond by discharge port and carries out shrend, makes roasted ore temperature be down to less than 70 DEG C;
(5) roasted ore after shrend carries out magnetic separation after ore grinding, high grade iron concentrate.
Further, in step (1), described coal dust is the hard coal of carbon content more than 79%.
Further, in step (2), before compound is sent into stoving oven, adopt the useless flue gas of discharging from stoving oven induced draft fan to carry out preliminarily dried to compound, make mixture moisture be down to less than 3%.
Further, in step (2), the pressure feeding the high-temperature flue gas in stoving oven is 30-50Kpa.The flue gas pressures of discharging from stoving oven so just can be made to remain on 20 ~ 30Pa, to reach the pressure-fired work of stoving oven.
Further, in step (3), compound time of drying is 15-20min, and warm up time is 10-15min, and roasting time is 20-25min.
Further, in step (3), stove includes oxygen content control at 1-3%.
Further, in step (5), the magneticstrength of magnetic separation is 60-160kA/m.
Feed opening in magnetization roasting furnace adjacent separator of the present invention is crisscross arranged, and the flue gas between adjacent separator can be avoided to be short-circuited phenomenon, prevents flue gas quickly through, and then the stroke of prolong smoke; Take off arm and grilled teeth constantly can stir compound, make compound obtain sufficient heat exchange and reaction.Stoving oven also takes and prevents the measure of iron ore freezing of a furnace as follows: 1. combustion chamber is arranged on the both sides of stoving oven, fuel produces high-temperature flue gas in combustion chamber combustion, high-temperature flue gas passes through to enter into mouth to burn in stove, heat more even, avoid the powdered iron ore melt phenomenon that when fuel directly burns in stove, flame localized hyperthermia causes, and then prevent the freezing of a furnace phenomenon of iron ore local in stoving oven; 2. adopt the form of grilled teeth turning over materials in stove, the bonding of iron ore on dividing plate can be stopped.
For magnetizing roasting method of the present invention, because in compound, be not exclusively contact between solid carbon and iron ore particle, the contact area between two solid phases is less, makes Fe 2o 3less with C direct reaction ability, micro-oxygenation atmosphere (oxygen level controls at 1-3%) is adopted in stoving oven, make the carbon in iron ore after contacting with micro amount of oxygen in furnace gas, because the hypoxia response of carbon can generate a certain amount of CO, thus the reducing atmosphere concentration of carbon containing iron ore inside can be improved, also just improve reduction reaction speed.Fe simultaneously 2o 3create CO and CO with C direct reaction to the contribution that reduction of carbonaceous iron ore is maximum 2, spathic iron ore decomposes is at generation Fe 30 4time also released CO and CO 2, and due to CO under furnace high-temperature 2existence, the C in iron ore be vaporized produce CO, make Fe 2o 3be reduced into Fe 30 4reaction continue.
In addition, by regulating air output or the fuel quantity of the first combustion chamber and the second combustion chamber, making fuel in combustion chamber, produce certain incomplete combustion, so both ensure that the heat needed for iron ore magnetizing roasting, reducing gas CO can be produced again.Roaster tail gas then sends into material dewatering and fines collection system by top induced draft fan.The powdered iron ore accounting for total feeding coal 5% of fines collection system recoveries can utilize as finished product, and the waste gas after dedusting enters air by chimney.
Beneficial effect of the present invention is:
(1) the present invention's multistage fluidised form magnetization roasting furnace have that in-furnace temperature setting range is large, control climate flexibly, gas-solid contact area is large, unit volume production capacity is high, reduction reaction speed, Armco magnetic iron transformation efficiency is high, production cost is low, compact equipment, floor space are little, applied widely and heat energy from waste gas utilization ratio is high advantage, is the better magnetizing roasting equipment that process powdery difficulty selects low-grade specularite, rhombohedral iron ore, limonite and spathic iron ore;
(2) in stoving oven of the present invention, gas-solid contact area improves a lot than rotary kiln etc., the processes such as the dehydration of iron ore in stove, drying, preheating, roasting, cooling complete all in a dynamic state, the contact area rate of furnace gas and the iron ore bed of material that tiles can be made greatly to increase, iron ore can be made to reach temperature needed for roasting fast; Particulate iron ore (-0.2mm) is comparatively large with the coefficient of heat transfer of furnace gas, and the heat transfer efficiency of whole system is higher;
(3) compound constantly overturns in stoving oven, can improve the heat transfer between material and reducing gas and mass-transfer efficiency, makes the reduction reaction of iron ore be easy to carry out;
(4) the inventive method can simplify carbonaceous pelletizing roasting-magnetic separation process that existing disposal powdery refractory iron ore adopts, for powdered iron ore after coal blending, directly carry out heating and reducing in stoving oven, eliminate the link such as the ore grinding of iron ore, profit mill, pelletizing, drying.
(5) principle of iron ore preheating and gradual reaction is step by step adopted, each section of stoving oven can select rational temperature schedule and heating system, the pressure in stove, atmosphere and temperature can be made to reach the best requirement of iron ore roasting, in addition adopt the waste gas residual heat of discharging from furnace roof to carry out dry iron ore, save certain energy;
(6) product after roasting is still fine ore, can reduce energy consumption broken and levigate in follow-up magnetic separation process.
Accompanying drawing explanation
Fig. 1 is the structural representation of the multistage fluidised form magnetization roasting furnace of the present invention;
Fig. 2 is the A portion partial enlarged drawing of Fig. 1.
In figure, 1-body of heater, 2-dividing plate, 3-rotating shaft, 4-material inlet, 5-induced draft fan, 6-discharge port, 7-pond, 8-first enters mouth, and 9-second enters mouth, and 10-the 3rd enters mouth, 11-first combustion chamber, 12-second combustion chamber, 13-takes off arm, 14-grilled teeth, and 15-takes off perforation, 16-blanking hole.
Embodiment
As illustrated in fig. 1 and 2, a kind of powdery difficulty selects the multistage fluidised form magnetization roasting furnace of iron ore of low ore grade, comprise cylindrical furnace 1, be provided with in some dividing plate 2(the present embodiment in body of heater 1, dividing plate 2 is 10 layers), body of heater 1 center is equipped with rotating shaft 3, rotating shaft 3 upper and lower end parts is fixed with body of heater 1 respectively by bearing (not marking in figure), body of heater 1 top is provided with material inlet 4 and induced draft fan 5, be provided with discharge port 6 bottom body of heater 1, the top of body of heater 1, middle part, bottom are provided with first successively and enter mouth 8, second and enter mouth 9 and the 3rd and enter mouth 10; Pond 7 is provided with below discharge port 6; Dividing plate 2 is provided with takes off arm 13, takes off arm 13 and is connected with rotating shaft 3; Take off arm 13 and be provided with grilled teeth 14, grilled teeth 14 offers grilled teeth hole 15; Dividing plate 2 also offers blanking hole 16, and the blanking hole 16 in adjacent separator 2 is crisscross arranged; Described magnetization roasting furnace also comprises the first combustion chamber 11 and the second combustion chamber 12, and wherein, first enters mouth 8 is connected with the first combustion chamber 11, and second enters mouth 9 and the 3rd enters mouth 10 and be connected with the second combustion chamber 12.
The powdery difficulty utilizing above-mentioned magnetization roasting furnace to carry out selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, comprises following processing step:
(1) the powdered iron ore of below 3mm and the coal dust of below 1mm are prepared burden by the weight ratio of 95 ~ 96%:4 ~ 5%, after batching, iron ore powder is mixed with coal dust, obtain compound; Coal dust selects the hard coal of carbon content more than 79%, and easily lumps in iron ore roasting process because of the coal that cohesiveness is strong, affects roasting quality, generally can not use, should adopt the hard coal that ash is few, volatile content is lower and cohesiveness is low;
(2) adopt the useless flue gas of discharging from stoving oven induced draft fan 5 to carry out preliminarily dried to compound, make mixture moisture be down to less than 3%; Then compound is sent in multistage fluidised form magnetization roasting furnace body of heater 1 by material inlet 4; High-temperature flue gas enters mouth 8, second by first and enters mouth 9 and the 3rd and enter mouth 10 and enter in body of heater 1, and is constantly risen by the blanking hole 16 on dividing plate 2, makes temperature in body of heater 1 remain on 650-750 DEG C; Control to make in body of heater 1 oxygen level at 1-3%, and the pressure feeding the high-temperature flue gas in stoving oven is 30-50Kpa;
(3) take off arm 13 under rotating shaft 3 drives, constantly rotate at dividing plate 2 upper surface, constantly stir the compound on dividing plate 2, compound falls into lower partition when through blanking hole 16; Compound is moving downward in process, constantly carries out heat exchange, complete drying, preheating and roasting successively with the high-temperature flue gas risen, and compound time of drying is 15-20min, and warm up time is 10-15min, and roasting time is 20-25min; Particularly, in magnetization roasting furnace, in units of dividing plate 2, from top to bottom, 1st ~ 3 layers is dryer section, and 4th ~ 5 layers is preheating section, and 6th ~ 8 layers is firing section, and 9th ~ 10 layers is cooling section; First enters mouth 8 is located at dryer section bottom, and second enters mouth 9 is located at preheating section bottom, and the 3rd enters mouth 10 is located at firing section bottom;
(4) roasted ore obtained after roasting falls into low-temperature zone and cooling section bottom body of heater 1, and cool taking off under arm 13 tipping effect, cooled roasted ore enters pond 7 by discharge port 6 and carries out shrend, makes roasted ore temperature be down to less than 70 DEG C;
(5) roasted ore after shrend carries out low intensity magnetic separation after ore grinding, and the magneticstrength of magnetic separation is 60-160kA/m, high grade iron concentrate.
After iron ore magnetizing roasting of the present invention, the product index of low intensity magnetic separation is as shown in table 1:
The product index of low intensity magnetic separation after table 1 iron ore magnetizing roasting of the present invention
Name of product Productive rate (%) Iron grade (%) Iron recovery (%)
Iron ore concentrate 45 56 84
Raw ore 32

Claims (6)

1. a powdery difficulty selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, it is characterized in that, adopt multistage fluidised form magnetization roasting furnace, described multistage fluidised form magnetization roasting furnace comprises cylindrical furnace, some dividing plates are provided with in described body of heater, body of heater center is equipped with rotating shaft, body of heater top is provided with material inlet and induced draft fan, bottom of furnace body is provided with discharge port, the top of body of heater, middle part, bottom is provided with first successively and enters mouth, second enters mouth and the 3rd enters mouth, pond is provided with below described discharge port, described dividing plate is provided with takes off arm, described arm of taking off is connected with rotating shaft, described dividing plate also offers blanking hole, and the feed opening in adjacent separator is crisscross arranged, described magnetizing roasting method comprises following processing step:
(1) the powdered iron ore of below 3mm and the coal dust of below 1mm are prepared burden by the weight ratio of 95 ~ 96%:4 ~ 5%, after batching, iron ore powder is mixed with coal dust, obtain compound;
(2) compound is sent in multistage fluidised form magnetization roasting furnace body of heater by material inlet; High-temperature flue gas enters mouth, second by first and enters mouth and the 3rd and enter mouth and enter in body of heater, and is constantly risen by the blanking hole on dividing plate, makes temperature in body of heater remain on 650-750 DEG C;
(3) take off arm under rotating shaft drives, constantly rotate at dividing plate upper surface, constantly stir the compound on dividing plate, compound is falling into lower partition through blanking hole; Compound is moving downward in process, constantly carries out heat exchange, complete drying, preheating and roasting successively with the high-temperature flue gas risen, and to control in stove oxygen level at 1-3%;
(4) roasted ore obtained after roasting falls into bottom of furnace body low-temperature zone, and cool taking off under arm tipping effect, cooled roasted ore enters pond by discharge port and carries out shrend, makes roasted ore temperature be down to less than 70 DEG C;
(5) roasted ore after shrend carries out magnetic separation after ore grinding, high grade iron concentrate.
2. a kind of powdery difficulty according to claim 1 selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, it is characterized in that, in step (1), described coal dust is the hard coal of carbon content more than 79%.
3. a kind of powdery difficulty according to claim 1 selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, it is characterized in that, in step (2), before compound is sent into stoving oven, adopt the useless flue gas of discharging from stoving oven induced draft fan to carry out preliminarily dried to compound, make mixture moisture be down to less than 3%.
4. a kind of powdery difficulty according to claim 1 selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, it is characterized in that, in step (2), the pressure feeding the high-temperature flue gas in stoving oven is 30-50kPa.
5. a kind of powdery difficulty according to claim 1 selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, it is characterized in that, in step (3), compound time of drying is 15-20min, and warm up time is 10-15min, and roasting time is 20-25min.
6. a kind of powdery difficulty according to claim 1 selects the coal-based magnetizing roasting method of the multistage fluidised form of iron ore of low ore grade, it is characterized in that, in step (5), the magneticstrength of magnetic separation is 60-160kA/m.
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CN103836948B (en) * 2014-02-25 2016-04-27 扬州安宇化工设备有限公司 A kind of fluidizing reactor of high-carbon molybdenum-nickel ore and system
CN104480296B (en) * 2014-12-19 2017-01-04 梁刚 A kind of method and system that speculum iron is changed into magnetic iron ore
CN107119185B (en) * 2017-04-27 2019-11-08 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060500A (en) * 1990-08-30 1992-04-22 澳斯特派克黄金公司 Improving one's methods of separating ilmenite
CN101524667A (en) * 2009-02-17 2009-09-09 武汉工程大学 Process for dressing ore of powder low grade iron oxide ore
CN203474871U (en) * 2013-08-15 2014-03-12 甘肃酒钢集团宏兴钢铁股份有限公司 Multistage flow-state magnetizing roasting furnace of powdered refractory low-grade iron ore

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060500A (en) * 1990-08-30 1992-04-22 澳斯特派克黄金公司 Improving one's methods of separating ilmenite
CN101524667A (en) * 2009-02-17 2009-09-09 武汉工程大学 Process for dressing ore of powder low grade iron oxide ore
CN203474871U (en) * 2013-08-15 2014-03-12 甘肃酒钢集团宏兴钢铁股份有限公司 Multistage flow-state magnetizing roasting furnace of powdered refractory low-grade iron ore

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