CN103447148A - Magnetic separation device and method for reducing hematite-containing material by utilizing microwave - Google Patents
Magnetic separation device and method for reducing hematite-containing material by utilizing microwave Download PDFInfo
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- CN103447148A CN103447148A CN2013103434277A CN201310343427A CN103447148A CN 103447148 A CN103447148 A CN 103447148A CN 2013103434277 A CN2013103434277 A CN 2013103434277A CN 201310343427 A CN201310343427 A CN 201310343427A CN 103447148 A CN103447148 A CN 103447148A
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Abstract
The invention relates to a device and a method for reducing hematite-containing materials by utilizing microwave heat treatment and carrying out magnetic separation. The device comprises a material bin, a screw feeder, a star type feeding machine, a preheating reacting furnace and a microwave magnetic separator. When the magnetic separation is carried out, the materials are crushed and then added to the material bin, powdery materials enter the preheating reacting furnace through the screw feeder and the star type feeding machine for preheating, and the preheated powdery materials enter the microwave magnetic separator through an air inlet pipe for the microwave heat treatment and the magnetic separation; products subjected to the magnetic separation are discharged through an ore discharge pipe from a discharge port, and other materials are discharged through an outlet pipe from the discharge port. The device disclosed by the invention can be used for reducing the weak magnetic Fe2O3 contained in the materials into strong magnetic Fe3O4 through the microwave heating and separating the iron ore concentrates through the magnetic separation, integrally and simultaneously carries out the reduction and the magnetic separation, has the advantages of small investment, low energy consumption, large treatment quantity, water saving, no air pollution, wide application range and relatively popularization prospect, is simple in equipment, and can be used for treating multiple hematite-containing materials which include ores, such as steel slag, low-grade limonite and iron ores.
Description
Technical field
The present invention relates to concentration equipment and the magnetic selection method of a kind of separation containing the bloodstone material, particularly relate to a kind of microwave thermal of utilizing and process device and magnetic selection method that reduction contains the bloodstone material and carries out magnetic separation.
Background technology
Slag is the waste residue produced in steelmaking process, and quantity is about 15～20% of output of steel.In recent years, along with the develop rapidly of China's steel and iron industry, the discharge capacity of slag also increases thereupon.A large amount of slags all need the large tracts of land soil to stack every year, all bring serious pollution to soil, water body, atmosphere etc., even people's health are constituted a threat to.But in fact in slag, useful component accounts for the overwhelming majority, as long as just the harmful components of removing in slag can fully utilize.Each big steel enterprise of China has started the disposal and utilization of slag since the eighties from eighties of last century, but be only limited to fragmentation, sieve and select iron, and up to the present, the utilization rate of slag is less than 80 %.If utilize the carbon thermal reduction technology that the phosphorus in slag, sulphur are removed and, by useful metal recovery such as iron, manganese, other composition can be used more effectively, thereby greatly improve the value of slag.But the iron major part in slag is with Fe
2o
3form exist, common magnetic selection method is difficult to select, and therefore only has the Fe of weak magnetic in slag
2o
3be reduced to ferromagnetic Fe
3o
4, could pass through magnetic separation and be used.
Along with the progress of society's science and technology, resources requirement constantly increases, and the iron ore deposit of existing rich ore and easily choosing reduces gradually.In China, the low-grade limonite that a collection of reserves are very large is still arranged, limonite is a kind of moisture ferric oxide ore, and its chemical formula is nFe
2o
3 .mH
2o (n=1 ~ 3, m=1 ~ 4), this ore deposit is actually by goethite, liquid drugs injection iron ore with containing the compositions of mixtures of the iron oxide of the different crystallizations water and shale material etc., there is weak magnetic, the symbiosis component is many, the silicate such as diopside, tremolite gangue mineral impurity content is high, be difficult to it is effectively separated with gangue by conventional beneficiation method, bring very large difficulty to the melting of iron.By magnetizing roast, making it be converted into magnetic iron ore this class complicated difficult ore dressing, then carry out separating with gangue mineral, is the most effective separation method.
Traditional magnetizing roast is to adopt reducing agent that bloodstone is reduced into to magnetic iron ore.The equipment of realizing said method mainly contains shaft furnace, rotary kiln and fluidized bed furnace etc., the shortcomings such as but these equipment exist, and heat transfer coefficient is low, the recovery time is long, cause device structure and correlation technique not to pass a test, not only reduction roasting is second-rate, and equipment is doted on greatly, complex structure, energy consumption is high, and disposal ability is low, and in tail gas, dustiness is large, the dust collecting system complexity, invest also large.From the angle of environmental protection and the utilization of resources, reclaim the technology of the metals such as iron in the exploitation slag, the slag that makes to process is had to the scope of utilizing more widely, there is good far-reaching significance and realistic meaning to increasing Business Economic Benefit.
Summary of the invention
Technical problem to be solved by this invention: for the prior art deficiency, provide that a kind of equipment is simple, energy consumption is low, can process continuously the microwave reduction concentration equipment containing the bloodstone material;
Also provide a kind of microwave reduction containing the magnetic selection method of bloodstone material, the method will be reduced, magnetic separation is integrated carries out, and has that magnetic separation is fast, yield is high, sort the advantages such as purity is high, assorting room is pollution-free.
technical scheme of the present invention:
A kind of concentration equipment that utilizes microwave reduction to contain the bloodstone material, this device comprises feed bin, screw(-type) feeder, star-shaped feeding machine, preheating reacting furnace and microwave magnetic separator; Described microwave magnetic separator comprises reactor shell, reactor inner chamber, blast pipe, discharge pipe, ore discharge pipe and microwave source, magnetic system, described blast pipe is communicated with the lower end of reactor inner chamber, discharge pipe is communicated with the upper end of reactor inner chamber, and the below of reactor inner chamber also is provided with the ore discharge valve; Microwave source and magnetic system are evenly arranged in the outside of reactor shell, and the upper and lower of described microwave magnetic separator is respectively equipped with discharge gate and discharging opening.
The bottom of described preheating reacting furnace communicates with combustion chamber, and the air mixing that the combustion gas of combustion gas storage tank and air blast are blown into is by burner in combustion chambers burn, and the CO high-temperature gas produced after burning enters from the bottom of preheating reacting furnace.
Be provided with insulation material between described reactor inner chamber and reactor shell.
Described microwave source all is connected with the PLC control circuit with magnetic system, and described reactor inner chamber is hollow cylindrical, adopts the aluminium oxide material to make; Be provided with thermocouple in the reactor inner chamber, thermocouple is connected with the PLC control circuit.
Described PLC control circuit contains touch-screen, and touch-screen is connected with the PLC control circuit respectively by data/address bus; Described PLC control circuit contains hand switch and the signal acquisition circuit be connected with input.
Utilize the method for concentration equipment magnetic separation containing the bloodstone material, comprise the material that utilizes microwave reduction to contain bloodstone, concrete steps are:
To add feed bin containing the crushing material to 80 of bloodstone～100 purpose powders, powder enters the preheating of preheating reacting furnace through screw(-type) feeder, star-shaped feeding machine, and the powder after preheating enters the microwave magnetic separator through blast pipe and carries out microwave thermal processing and magnetic separation; Product after magnetic separation is discharged by discharging opening through the ore discharge pipe, and unclassified stores is discharged by discharge gate through discharge pipe.
Described preheating is that powder is heated to 300～400 ℃; The heat treated temperature of described microwave is 550～650 ℃, at this temperature, is incubated 10～20min, and microwave power is 15-20KW.
During described magnetic separation, the magnetic field intensity of reactor inner chamber is 55～80KA/m.
The present invention adopts heating using microwave to substitute traditional mode of heating, and traditional heating mode is heated from outside to inside, and heat enters granule interior through conduction from the particle top layer, and particle certainly exists the problem of " cooled core ".Due to the existence of cooled core, after reaching reaction beginning temperature, only the outer high-temperature area of material has reactivity, therefore reaction rate is not high.Under traditional heating mode, system temperature will exceed thermodynamics, and to start temperature a lot, and reaction could be carried out on a large scale.
Heating using microwave is quite different, and when particle has Microwave Absorption Properties, or certain composition in material particles is (as Fe
2o
3) while having stronger Microwave Absorption Properties, in microwave field, all these particles are heated simultaneously, heat up simultaneously, and reach simultaneously or meet the beginning temperature of thermodynamical reaction.Once reach the thermodynamic condition reaction, start, reaction has simultaneity, inhomogeneity characteristics simultaneously.
Microwave reduction is containing bloodstone (Fe
2o
3) key reaction of material:
3Fe
2O
3?+?C?→?2Fe
3O
4?+?CO
positive beneficial effect of the present invention:
1, concentration equipment of the present invention, can process continuously containing bloodstone (Fe
2o
3) material fine powder and other iron content fine powder, by heating using microwave by the major part in treating material a little less than the Fe of magnetic
2o
3be reduced to ferromagnetic Fe
3o
4, and then by magnetic separation, iron ore concentrate to be selected, the method will be reduced, magnetic separation is integrated and carry out simultaneously, and equipment is simple, without follow-up process equipment, small investment, energy consumption is low, and disposal ability is large.
2, concentration equipment of the present invention adopts gas heating in reduction process, has both utilized the cheap energy, and reducing atmosphere is provided again, provides transmitting power for whole system simultaneously; The microwave source of microwave magnetic separator and magnetic system distribute rationally, are conducive to improve the purity of efficiency of magnetic separation and product.
3, concentration equipment of the present invention is controlled and is adopted touch-screen and PLC centralized Control, man-machine interactive operation, intuitively, equipment debugging is safeguarded simple, and it is convenient that technological parameter is regulated, dependable performance, realize the serialization production of Alternative step, improved automaticity and the craft precision of whole equipment, guaranteed product quality, realize industrial large-scale production, improved production efficiency.
4, magnetic selection method of the present invention, utilize microwave to be reduced to material, processing material and microwave field interacts, heating using microwave can heat up from material internal self integral body simultaneously, microwave is absorbed by material and is converted into heat energy, have that firing rate is fast, pollution-free, homogeneous heating, without advantages such as heat stagnations, heating using microwave simultaneously can accurately be controlled, Reaction time shorten, save the energy.
5, magnetic selection method of the present invention by gas heating and carry out preheating, had both utilized the cheap energy in the reduction reaction process, reducing atmosphere is provided again, for whole system provides transmitting power, then utilize microwave thermal to process material is reduced simultaneously, the energy is fully used.
6, magnetic selection method of the present invention, technique is simple, and fast, fully, comprehensively, treating capacity is large in magnetic separation, and whole process does not need water fully, thereby can not cause water to pollute, using water wisely, mine tailing effluxes after dedusting, without atmosphere pollution.
7, concentration equipment of the present invention and magnetic selection method can be processed multiple containing bloodstone (Fe
2o
3) material, comprise the ores such as slag, low-grade limonite, iron ore, the scope of application is wide, this invention has application prospect more widely.
The accompanying drawing explanation
The structural representation that Fig. 1 is concentration equipment of the present invention;
One of structural representation that Fig. 2 is microwave magnetic separator of the present invention;
Two of the structural representation that Fig. 3 is microwave magnetic separator of the present invention;
Fig. 4 is magnetic separation process schematic flow sheet of the present invention.
In figure, 1 is feed bin, and 2 is screw(-type) feeder, and 3 is star-shaped feeding machine, 4 is combustion chamber, 5 preheating reacting furnaces, and 6 is the microwave magnetic separator, 6-1 is reactor shell, 6-2 is the reactor inner chamber, and 6-3 is insulation material, and 6-4 is blast pipe, and 6-5 is discharge pipe, 6-6 is the ore discharge pipe, and 6-7 is the ore discharge valve, and 7 is microwave source, 8 is magnetic system, and 9 is the combustion gas storage tank, and 10 is air blast, 11 is burner, and 12 is discharging opening, and 13 is discharge gate.
The specific embodiment
Embodiment mono-: referring to Fig. 1-Fig. 3, microwave reduction, containing the concentration equipment of bloodstone material, comprises feed bin 1, screw(-type) feeder 2, star-shaped feeding machine 3, preheating reacting furnace 5 and microwave magnetic separator 6; The upper and lower of microwave magnetic separator 6 is respectively equipped with discharge gate 13 and discharging opening 12; The bottom of preheating reacting furnace 5 communicates with combustion chamber 4, and the air that the combustion gas in combustion gas storage tank 9 and air blast 10 are blown into mixes by burner 11 4 burnings in combustion chamber, and the CO high-temperature gas produced after burning enters from the bottom of preheating reacting furnace 5.
Microwave magnetic separator 6 comprises: reactor shell 6-1, reactor inner chamber 6-2, blast pipe 6-4, discharge pipe 6-5, ore discharge pipe 6-6 and microwave source 7, magnetic are 8, described blast pipe 6-4 is communicated with the lower end of reactor inner chamber 6-2, discharge pipe 6-5 is communicated with the upper end of reactor inner chamber 6-2, and the below of reactor inner chamber 6-2 also is provided with ore discharge pipe 6-6 and ore discharge valve 6-7; Be provided with insulation material 6-3 between reactor inner chamber 6-2 and reactor shell 6-1, microwave source 7 and magnetic are 8 to be evenly arranged in the outside of reactor shell 6-1.
Embodiment bis-: referring to Fig. 4, utilize the concentration equipment magnetic separation of example one containing bloodstone (Fe
2o
3) method of material, comprise the following steps:
To add feed bin 1 containing bloodstone crushing material to 80～100 purpose powders, powder enters 5 preheatings of preheating reacting furnace through screw(-type) feeder 2, star-shaped feeding machine 3, and the powder after preheating enters microwave magnetic separator 6 through blast pipe 6-4 and carries out microwave thermal processing and magnetic separation; Product after magnetic separation is discharged by discharging opening 12 through ore discharge pipe 6-6, and unclassified stores is discharged by discharge gate 13 through discharge pipe 6-5; Perhaps first through dedusting, by discharge gate, discharged again.
, containing the material of bloodstone, can be wherein the ores such as slag, low-grade limonite, iron ore.
Described preheating is to make powder be heated to 300～400 ℃; Microwave power is 15-20KW, and the heat treated temperature of microwave is 550～650 ℃, at this temperature, is incubated 10～20min; During magnetic separation, the magnetic field intensity of reactor inner chamber 6-2 is 55～80KA/m.
Close ore discharge valve 6-7 when reacting completely, the magnetic-particle be adsorbed on the wall of microwave reactor inner chamber 6-2 limit is discharged along ore discharge pipe 6-6.
Embodiment tri-: referring to Fig. 4, utilize the method for concentration equipment steel slag magnetically dressing, the concentration equipment of employing is as described in example one, and the method comprises the following steps:
Steel-making slag powder is broken into to 80～100 purpose powders, and metering 100kg powder adds feed bin 1, and the powder in feed bin 1, through screw(-type) feeder 2, star-shaped feeding machine 3, enters preheating reacting furnace 5 and carries out preheating;
The air that combustion gas in regulating gas storage tank 9 and air blast 10 are blown into, 4 burnings in combustion chamber after burner 11 mixes, the CO high-temperature gas produced after burning enters from preheating reacting furnace 5 bottoms, and material is carried out to preheating;
Material after preheating reaches 300 ℃ and enters microwave magnetic separator 6 by blast pipe 6-4 and carry out the microwave thermal processing, and microwave power is 15KW, and regulating and opening magnetic when microwave output power makes temperature of charge reach 550 ℃ is 8, and the setting magnetic field intensity is 60KA/m, is incubated 10 minutes; When being reduced, slag carries out magnetic separation, the material after discharge gate 13 is collected magnetic separation; Then closing ore discharge valve 6-7 and magnetic is 8, at discharging opening 12, collects the product of discharging.Then start next circulation.
Out material after magnetic separation can return to step 1, reduces for the second time, magnetic separation, makes reaction more complete.The method is reduced to magnetic iron ore by the most of bloodstone in slag, per hour can process the 100-300kg slag, and the grade that obtains iron ore concentrate is that the 60-70%(quality is containing percentage), the rate of recovery can reach 50-60%.
Embodiment tetra-: referring to Fig. 4, utilize the method for the low-grade limonite of concentration equipment magnetic separation, concentration equipment is as described in example one, and the method comprises the following steps:
Brown ocher is broken to 80～100 purpose powders, and metering 100kg powder adds feed bin, and the powder in feed bin, through screw(-type) feeder, star-shaped feeding machine, enters the preheating reacting furnace and carries out preheating;
The air that combustion gas in the regulating gas device and air blast are blown into, after burner mixes, in combustion chambers burn, the CO high-temperature gas produced after burning enters from preheating reacting furnace bottom, and material is carried out to preheating;
Material after preheating reaches 400 ℃ and enters the microwave magnetic separator by blast pipe and carry out the microwave thermal processing, and microwave power is 20KW, regulates when microwave output power makes temperature of charge reach 650 ℃ and opens magnetic system, and the setting magnetic field intensity is 75KA/m, is incubated 10 minutes; When being reduced, limonite carries out magnetic separation, the material after discharge gate is collected magnetic separation; Then close ore discharge valve and magnetic system, collect the product of discharging at discharging opening; Then start next circulation.
After magnetic separation, material out can return to step 1, reduces for the second time, magnetic separation, makes reaction more complete.The method is reduced to magnetic iron ore by the most of bloodstone in limonite, per hour can process the 100-300kg limonite, and the iron concentrate grade of acquisition is that the 70-80%(quality is containing percentage), the rate of recovery can reach 55-65%.
Claims (8)
1. a concentration equipment that utilizes microwave reduction to contain the bloodstone material, it is characterized in that: this device comprises feed bin (1), screw(-type) feeder (2), star-shaped feeding machine (3), preheating reacting furnace (5) and microwave magnetic separator (6); Described microwave magnetic separator (6) comprises reactor shell (6-1), reactor inner chamber (6-2), blast pipe (6-4), discharge pipe (6-5), ore discharge pipe (6-6) and microwave source (7), magnetic system (8), described blast pipe (6-4) is communicated with the lower end of reactor inner chamber (6-2), discharge pipe (6-5) is communicated with the upper end of reactor inner chamber (6-2), and the below of reactor inner chamber (6-2) also is provided with ore discharge valve (6-7); Microwave source (7) is the outside that (8) are evenly arranged in reactor shell (6-1) with magnetic, and the upper and lower of described microwave magnetic separator (6) is respectively equipped with discharge gate (13) and discharging opening (12).
2. concentration equipment as claimed in claim 1, it is characterized in that: the bottom of described preheating reacting furnace (5) communicates with combustion chamber (4), the air that the combustion gas of combustion gas storage tank (9) and air blast (10) are blown into mixes by burner (11) (4) burning in combustion chamber, and the CO high-temperature gas produced after burning enters from the bottom of preheating reacting furnace (5).
3. concentration equipment as claimed in claim 1, is characterized in that: between described reactor inner chamber (6-2) and reactor shell (6-1), be provided with insulation material (6-3).
4. as the described concentration equipment of claim 1-3 any one, it is characterized in that: described microwave source (7) all is connected with the PLC control circuit with magnetic system (8), and described reactor inner chamber (6-2) is hollow cylindrical, adopts the aluminium oxide material to make; Be provided with thermocouple in reactor inner chamber (6-2), thermocouple is connected with the PLC control circuit.
5. concentration equipment as claimed in claim 4, it is characterized in that: described PLC control circuit contains touch-screen, and touch-screen is connected with the PLC control circuit respectively by data/address bus; Described PLC control circuit contains hand switch and the signal acquisition circuit be connected with input.
6. one kind is utilized the method for the concentration equipment magnetic separation of claim 1-5 any one containing the bloodstone material, comprises the material that utilizes microwave reduction to contain bloodstone, it is characterized in that:
Will be containing the crushing material to 80 of bloodstone～100 purpose powders, add feed bin (1), powder enters preheating reacting furnace (5) preheating through screw(-type) feeder (2), star-shaped feeding machine (3), and the powder after preheating enters microwave magnetic separator (6) through blast pipe (6-4) and carries out microwave thermal processing and magnetic separation; Product after magnetic separation is discharged by discharging opening (12) through ore discharge pipe (6-6), and unclassified stores is discharged by discharge gate (13) through discharge pipe (6-5).
7. method as claimed in claim 6, it is characterized in that: described preheating is that powder is heated to 300～400 ℃; The heat treated temperature of described microwave is 550～650 ℃, at this temperature, is incubated 10～20min, and microwave power is 15-20KW.
8. as the described method of claim 6-7 any one, it is characterized in that: during described magnetic separation, the magnetic field intensity of reactor inner chamber is 55～80KA/m.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745757A (en) * | 2013-12-27 | 2015-07-01 | 中冶长天国际工程有限责任公司 | Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace |
| CN105219972A (en) * | 2015-10-30 | 2016-01-06 | 北方民族大学 | A kind of method utilizing high-carbon content flyash to reclaim iron in slag |
| CN105463184A (en) * | 2015-12-09 | 2016-04-06 | 西安建筑科技大学 | Mining pretreatment equipment |
| CN107362902A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of symbiosis refractory iron ore closed circuit magnetizing roast magnetic separation recovery technique online |
| CN112846182A (en) * | 2021-01-13 | 2021-05-28 | 内蒙古科技大学 | Method for microwave in-situ synthesis of iron-based metal ceramic and iron-based metal ceramic |
| CN114686687A (en) * | 2022-03-09 | 2022-07-01 | 山东产研绿洲环境产业技术研究院有限公司 | Ilmenite microwave titanium enrichment device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745757A (en) * | 2013-12-27 | 2015-07-01 | 中冶长天国际工程有限责任公司 | Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace |
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| CN107362902A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of symbiosis refractory iron ore closed circuit magnetizing roast magnetic separation recovery technique online |
| CN107362902B (en) * | 2017-07-11 | 2019-01-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of symbiosis refractory iron ore closed circuit magnetizing roast magnetic separation recovery technique online |
| CN112846182A (en) * | 2021-01-13 | 2021-05-28 | 内蒙古科技大学 | Method for microwave in-situ synthesis of iron-based metal ceramic and iron-based metal ceramic |
| CN114686687A (en) * | 2022-03-09 | 2022-07-01 | 山东产研绿洲环境产业技术研究院有限公司 | Ilmenite microwave titanium enrichment device and method |
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